diff options
Diffstat (limited to 'src/plugins/nat/det44')
| -rw-r--r-- | src/plugins/nat/det44/det44.api | 469 | ||||
| -rw-r--r-- | src/plugins/nat/det44/det44.c | 608 | ||||
| -rw-r--r-- | src/plugins/nat/det44/det44.h | 449 | ||||
| -rw-r--r-- | src/plugins/nat/det44/det44_api.c | 633 | ||||
| -rw-r--r-- | src/plugins/nat/det44/det44_cli.c | 697 | ||||
| -rw-r--r-- | src/plugins/nat/det44/det44_in2out.c | 1067 | ||||
| -rw-r--r-- | src/plugins/nat/det44/det44_inlines.h | 130 | ||||
| -rw-r--r-- | src/plugins/nat/det44/det44_out2in.c | 866 |
8 files changed, 4919 insertions, 0 deletions
diff --git a/src/plugins/nat/det44/det44.api b/src/plugins/nat/det44/det44.api new file mode 100644 index 00000000000..818d46a1d5a --- /dev/null +++ b/src/plugins/nat/det44/det44.api @@ -0,0 +1,469 @@ +/* + * Copyright (c) 2020 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +option version = "1.0.0"; +import "vnet/ip/ip_types.api"; +import "vnet/interface_types.api"; +import "plugins/nat/nat_types.api"; + +/** + * @file det44.api + * @brief VPP control-plane API messages. + * + * This file defines VPP control-plane API messages which are generally + * called through a shared memory interface. + */ + +/** \brief Enable/disable DET44 plugin + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param inside_vrf - inside VRF id + @param outside_vrf - outside VRF id + @param enable - true if enable, false if disable +*/ +autoreply define det44_plugin_enable_disable { + u32 client_index; + u32 context; + u32 inside_vrf; + u32 outside_vrf; + bool enable; + vl_api_interface_index_t sw_if_index; + option status="in_progress"; +}; + +/** \brief Enable/disable DET44 feature on the interface + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param is_add - true if add, false if delete + @param is_inside - true if interface is inside, false if outside + @param sw_if_index - software index of the interface +*/ +autoreply define det44_interface_add_del_feature { + u32 client_index; + u32 context; + bool is_add; + bool is_inside; + vl_api_interface_index_t sw_if_index; + option status="in_progress"; +}; + +/** \brief Dump interfaces with DET44 feature + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request +*/ +define det44_interface_dump { + u32 client_index; + u32 context; + option status="in_progress"; +}; + +/** \brief DET44 interface details response + @param context - sender context, to match reply w/ request + @param is_inside - true if interface is inside, false if outside + @param sw_if_index - software index of the interface +*/ +define det44_interface_details { + u32 context; + bool is_inside; + bool is_outside; + vl_api_interface_index_t sw_if_index; + option status="in_progress"; +}; + +/** \brief Add/delete DET44 mapping + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param is_add - true if add, false if delete + @param in_addr - inside IPv4 address + @param in_plen - inside IPv4 address prefix length + @param out_addr - outside IPv4 address + @param out_plen - outside IPv4 address prefix length +*/ +autoreply define det44_add_del_map { + u32 client_index; + u32 context; + bool is_add; + vl_api_ip4_address_t in_addr; + u8 in_plen; + vl_api_ip4_address_t out_addr; + u8 out_plen; +}; + +/** \brief Get outside address and port range from inside address + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param in_addr - inside IP address +*/ +define det44_forward { + u32 client_index; + u32 context; + vl_api_ip4_address_t in_addr; +}; + +/** \brief Get outside address and port range from inside address + @param context - sender context, to match reply w/ request + @param retval - return code + @param out_port_lo - outside port range start + @param out_port_hi - outside port range end + @param out_addr - outside IPv4 address +*/ +define det44_forward_reply { + u32 context; + i32 retval; + u16 out_port_lo; + u16 out_port_hi; + vl_api_ip4_address_t out_addr; +}; + +/** \brief Get inside address from outside address and port + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param out_port - outside port + @param out_addr - outside IPv4 address +*/ +define det44_reverse { + u32 client_index; + u32 context; + u16 out_port; + vl_api_ip4_address_t out_addr; +}; + +/** \brief Get inside address from outside address and port reply + @param context - sender context, to match reply w/ request + @param retval - return code + @param in_addr - inside IP address +*/ +define det44_reverse_reply { + u32 context; + i32 retval; + vl_api_ip4_address_t in_addr; +}; + +/** \brief Dump DET44 mappings + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request +*/ +define det44_map_dump { + u32 client_index; + u32 context; +}; + +/** \brief DET44 users response + @param context - sender context, to match reply w/ request + @param in_addr - inside IPv4 address + @param in_plen - inside IPv4 address prefix length + @param out_addr - outside IPv4 address + @param out_plen - outside IPv4 address prefix length + @param sharing_ratio - outside to inside address sharing ratio + @param ports_per_host - number of ports available to a host + @param ses_num - number of sessions belonging to this mapping +*/ +define det44_map_details { + u32 context; + vl_api_ip4_address_t in_addr; + u8 in_plen; + vl_api_ip4_address_t out_addr; + u8 out_plen; + u32 sharing_ratio; + u16 ports_per_host; + u32 ses_num; +}; + +/** \brief Close DET44 session by outside address and port + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param out_addr - outside IPv4 address + @param out_port - outside port + @param ext_addr - external host IPv4 address + @param ext_port - external host port +*/ +autoreply define det44_close_session_out { + u32 client_index; + u32 context; + vl_api_ip4_address_t out_addr; + u16 out_port; + vl_api_ip4_address_t ext_addr; + u16 ext_port; +}; + +/** \brief Close DET44 session by inside address and port + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param in_addr - inside IP address + @param in_port - inside port + @param ext_addr - external host IP address + @param ext_port - external host port +*/ +autoreply define det44_close_session_in { + u32 client_index; + u32 context; + vl_api_ip4_address_t in_addr; + u16 in_port; + vl_api_ip4_address_t ext_addr; + u16 ext_port; +}; + +/** \brief Dump DET44 sessions + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param user_addr - address of an inside user whose sessions to dump +*/ +define det44_session_dump { + u32 client_index; + u32 context; + vl_api_ip4_address_t user_addr; +}; + +/** \brief DET44 sessions reply + @param context - sender context, to match reply w/ request + @param in_port - inside port + @param ext_addr - external host IPv4 address + @param ext_port - external host port + @param out_port - outside port + @param state - session state + @param expire - session expiration timestamp +*/ +define det44_session_details { + u32 context; + u16 in_port; + vl_api_ip4_address_t ext_addr; + u16 ext_port; + u16 out_port; + u8 state; + u32 expire; +}; + +/** \brief Set values of timeouts for DET44 sessions (seconds) + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param udp - UDP timeout (default 300sec) + @param tcp_established - TCP established timeout (default 7440sec) + @param tcp_transitory - TCP transitory timeout (default 240sec) + @param icmp - ICMP timeout (default 60sec) +*/ +autoreply define det44_set_timeouts { + u32 client_index; + u32 context; + u32 udp; + u32 tcp_established; + u32 tcp_transitory; + u32 icmp; + option status="in_progress"; +}; + +/** \brief Get values of timeouts for DET44 sessions (seconds) + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request +*/ +define det44_get_timeouts { + u32 client_index; + u32 context; +}; + +/** \brief Get values of timeouts for DET44 sessions reply + @param context - sender context, to match reply w/ request + @param retval - return code + @param udp - UDP timeout + @param tcp_established - TCP established timeout + @param tcp_transitory - TCP transitory timeout + @param icmp - ICMP timeout +*/ +define det44_get_timeouts_reply { + u32 context; + i32 retval; + u32 udp; + u32 tcp_established; + u32 tcp_transitory; + u32 icmp; + option status="in_progress"; +}; + +/* + * Obsolete deterministic API to be removed + */ + +/** \brief Add/delete NAT deterministic mapping + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param is_add - true if add, false if delete + @param in_addr - inside IPv4 address + @param in_plen - inside IPv4 address prefix length + @param out_addr - outside IPv4 address + @param out_plen - outside IPv4 address prefix length +*/ +autoreply define nat_det_add_del_map { + u32 client_index; + u32 context; + bool is_add; + vl_api_ip4_address_t in_addr; + u8 in_plen; + vl_api_ip4_address_t out_addr; + u8 out_plen; + option status="deprecated"; +}; + +/** \brief Get outside address and port range from inside address + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param in_addr - inside IP address +*/ +define nat_det_forward { + u32 client_index; + u32 context; + vl_api_ip4_address_t in_addr; + option status="deprecated"; +}; + +/** \brief Get outside address and port range from inside address + @param context - sender context, to match reply w/ request + @param retval - return code + @param out_port_lo - outside port range start + @param out_port_hi - outside port range end + @param out_addr - outside IPv4 address +*/ +define nat_det_forward_reply { + u32 context; + i32 retval; + u16 out_port_lo; + u16 out_port_hi; + vl_api_ip4_address_t out_addr; + option status="deprecated"; +}; + +/** \brief Get inside address from outside address and port + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param out_port - outside port + @param out_addr - outside IPv4 address +*/ +define nat_det_reverse { + u32 client_index; + u32 context; + u16 out_port; + vl_api_ip4_address_t out_addr; + option status="deprecated"; +}; + +/** \brief Get inside address from outside address and port reply + @param context - sender context, to match reply w/ request + @param retval - return code + @param in_addr - inside IP address +*/ +define nat_det_reverse_reply { + u32 context; + i32 retval; + vl_api_ip4_address_t in_addr; + option status="deprecated"; +}; + +/** \brief Dump NAT deterministic mappings + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request +*/ +define nat_det_map_dump { + u32 client_index; + u32 context; + option status="deprecated"; +}; + +/** \brief NAT users response + @param context - sender context, to match reply w/ request + @param in_addr - inside IPv4 address + @param in_plen - inside IPv4 address prefix length + @param out_addr - outside IPv4 address + @param out_plen - outside IPv4 address prefix length + @param sharing_ratio - outside to inside address sharing ratio + @param ports_per_host - number of ports available to a host + @param ses_num - number of sessions belonging to this mapping +*/ +define nat_det_map_details { + u32 context; + vl_api_ip4_address_t in_addr; + u8 in_plen; + vl_api_ip4_address_t out_addr; + u8 out_plen; + u32 sharing_ratio; + u16 ports_per_host; + u32 ses_num; + option status="deprecated"; +}; + +/** \brief Close deterministic NAT session by outside address and port + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param out_addr - outside IPv4 address + @param out_port - outside port + @param ext_addr - external host IPv4 address + @param ext_port - external host port +*/ +autoreply define nat_det_close_session_out { + u32 client_index; + u32 context; + vl_api_ip4_address_t out_addr; + u16 out_port; + vl_api_ip4_address_t ext_addr; + u16 ext_port; + option status="deprecated"; +}; + +/** \brief Close deterministic NAT session by inside address and port + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param in_addr - inside IP address + @param in_port - inside port + @param ext_addr - external host IP address + @param ext_port - external host port +*/ +autoreply define nat_det_close_session_in { + u32 client_index; + u32 context; + vl_api_ip4_address_t in_addr; + u16 in_port; + vl_api_ip4_address_t ext_addr; + u16 ext_port; + option status="deprecated"; +}; + +/** \brief Dump determinstic NAT sessions + @param client_index - opaque cookie to identify the sender + @param context - sender context, to match reply w/ request + @param user_addr - address of an inside user whose sessions to dump +*/ +define nat_det_session_dump { + u32 client_index; + u32 context; + vl_api_ip4_address_t user_addr; + option status="deprecated"; +}; + +/** \brief Deterministic NAT sessions reply + @param context - sender context, to match reply w/ request + @param in_port - inside port + @param ext_addr - external host IPv4 address + @param ext_port - external host port + @param out_port - outside NAT port + @param state - session state + @param expire - session expiration timestamp +*/ +define nat_det_session_details { + u32 context; + u16 in_port; + vl_api_ip4_address_t ext_addr; + u16 ext_port; + u16 out_port; + u8 state; + u32 expire; + option status="deprecated"; +}; diff --git a/src/plugins/nat/det44/det44.c b/src/plugins/nat/det44/det44.c new file mode 100644 index 00000000000..886092cea50 --- /dev/null +++ b/src/plugins/nat/det44/det44.c @@ -0,0 +1,608 @@ +/* + * det44.c - deterministic NAT + * + * Copyright (c) 2020 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/** + * @file + * @brief deterministic NAT (CGN) + */ + +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/ip/ip4.h> +#include <vpp/app/version.h> +#include <vnet/plugin/plugin.h> + +#include <nat/det44/det44.h> + +det44_main_t det44_main; + +/* *INDENT-OFF* */ +VNET_FEATURE_INIT (ip4_det44_in2out, static) = { + .arc_name = "ip4-unicast", + .node_name = "det44-in2out", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", + "ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (ip4_det44_out2in, static) = { + .arc_name = "ip4-unicast", + .node_name = "det44-out2in", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", + "ip4-sv-reassembly-feature", + "ip4-dhcp-client-detect"), +}; +VLIB_PLUGIN_REGISTER () = { + .version = VPP_BUILD_VER, + .description = "Deterministic NAT (CGN)", +}; +/* *INDENT-ON* */ + +void +det44_add_del_addr_to_fib (ip4_address_t * addr, u8 p_len, u32 sw_if_index, + int is_add) +{ + det44_main_t *dm = &det44_main; + fib_prefix_t prefix = { + .fp_len = p_len, + .fp_proto = FIB_PROTOCOL_IP4, + .fp_addr = { + .ip4.as_u32 = addr->as_u32, + }, + }; + u32 fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index); + + if (is_add) + { + fib_table_entry_update_one_path (fib_index, + &prefix, + dm->fib_src_low, + (FIB_ENTRY_FLAG_CONNECTED | + FIB_ENTRY_FLAG_LOCAL | + FIB_ENTRY_FLAG_EXCLUSIVE), + DPO_PROTO_IP4, + NULL, + sw_if_index, + ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE); + } + else + { + fib_table_entry_delete (fib_index, &prefix, dm->fib_src_low); + } +} + +/** + * @brief Add/delete deterministic NAT mapping. + * + * Create bijective mapping of inside address to outside address and port range + * pairs, with the purpose of enabling deterministic NAT to reduce logging in + * CGN deployments. + * + * @param in_addr Inside network address. + * @param in_plen Inside network prefix length. + * @param out_addr Outside network address. + * @param out_plen Outside network prefix length. + * @param is_add If 0 delete, otherwise add. + */ +int +snat_det_add_map (ip4_address_t * in_addr, u8 in_plen, + ip4_address_t * out_addr, u8 out_plen, int is_add) +{ + static snat_det_session_t empty_snat_det_session = { 0 }; + det44_main_t *dm = &det44_main; + ip4_address_t in_cmp, out_cmp; + det44_interface_t *i; + snat_det_map_t *mp; + u8 found = 0; + + in_cmp.as_u32 = in_addr->as_u32 & ip4_main.fib_masks[in_plen]; + out_cmp.as_u32 = out_addr->as_u32 & ip4_main.fib_masks[out_plen]; + vec_foreach (mp, dm->det_maps) + { + /* Checking for overlapping addresses to be added here */ + if (mp->in_addr.as_u32 == in_cmp.as_u32 && + mp->in_plen == in_plen && + mp->out_addr.as_u32 == out_cmp.as_u32 && mp->out_plen == out_plen) + { + found = 1; + break; + } + } + + /* If found, don't add again */ + if (found && is_add) + return VNET_API_ERROR_VALUE_EXIST; + + /* If not found, don't delete */ + if (!found && !is_add) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + if (is_add) + { + pool_get (dm->det_maps, mp); + clib_memset (mp, 0, sizeof (*mp)); + mp->in_addr.as_u32 = in_cmp.as_u32; + mp->in_plen = in_plen; + mp->out_addr.as_u32 = out_cmp.as_u32; + mp->out_plen = out_plen; + mp->sharing_ratio = (1 << (32 - in_plen)) / (1 << (32 - out_plen)); + mp->ports_per_host = (65535 - 1023) / mp->sharing_ratio; + + vec_validate_init_empty (mp->sessions, + DET44_SES_PER_USER * (1 << (32 - in_plen)) - + 1, empty_snat_det_session); + } + else + { + vec_free (mp->sessions); + vec_del1 (dm->det_maps, mp - dm->det_maps); + } + + /* Add/del external address range to FIB */ + /* *INDENT-OFF* */ + pool_foreach (i, dm->interfaces, ({ + if (det44_interface_is_inside(i)) + continue; + det44_add_del_addr_to_fib(out_addr, out_plen, i->sw_if_index, is_add); + goto out; + })); + /* *INDENT-ON* */ +out: + return 0; +} + +int +det44_set_timeouts (nat_timeouts_t * timeouts) +{ + det44_main_t *dm = &det44_main; + if (timeouts->udp) + dm->timeouts.udp = timeouts->udp; + if (timeouts->tcp.established) + dm->timeouts.tcp.established = timeouts->tcp.established; + if (timeouts->tcp.transitory) + dm->timeouts.tcp.transitory = timeouts->tcp.transitory; + if (timeouts->icmp) + dm->timeouts.icmp = timeouts->icmp; + return 0; +} + +nat_timeouts_t +det44_get_timeouts () +{ + det44_main_t *dm = &det44_main; + return dm->timeouts; +} + +void +det44_reset_timeouts () +{ + det44_main_t *dm = &det44_main; + dm->timeouts.udp = 300; + dm->timeouts.tcp.established = 7440; + dm->timeouts.tcp.transitory = 240; + dm->timeouts.icmp = 60; +} + +int +det44_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del) +{ + det44_main_t *dm = &det44_main; + det44_interface_t *tmp, *i = 0; + const char *feature_name; + int rv; + + // TODO: if plugin is not enabled do not register nodes on interfaces + // rather make a structure and when enable call is used + // then register nodes + + /* *INDENT-OFF* */ + pool_foreach (tmp, dm->interfaces, ({ + if (tmp->sw_if_index == sw_if_index) + { + i = tmp; + goto out; + } + })); + /* *INDENT-ON* */ +out: + + feature_name = is_inside ? "det44-in2out" : "det44-out2in"; + + if (is_del) + { + if (!i) + { + det44_log_err ("det44 is not enabled on this interface"); + return VNET_API_ERROR_INVALID_VALUE; + } + + rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 0); + if (rv) + return rv; + + rv = vnet_feature_enable_disable ("ip4-unicast", feature_name, + sw_if_index, 1, 0, 0); + if (rv) + return rv; + + pool_put (dm->interfaces, i); + } + else + { + if (i) + { + det44_log_err ("det44 is already enabled on this interface"); + return VNET_API_ERROR_INVALID_VALUE; + } + + rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 1); + if (rv) + return rv; + + rv = vnet_feature_enable_disable ("ip4-unicast", feature_name, + sw_if_index, 1, 0, 0); + if (rv) + return rv; + + pool_get (dm->interfaces, i); + clib_memset (i, 0, sizeof (*i)); + + i->sw_if_index = sw_if_index; + + if (is_inside) + i->flags |= DET44_INTERFACE_FLAG_IS_INSIDE; + else + i->flags |= DET44_INTERFACE_FLAG_IS_OUTSIDE; + } + + if (!is_inside) + { + u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + sw_if_index); + // add/del outside interface fib to registry + u8 found = 0; + det44_fib_t *outside_fib; + /* *INDENT-OFF* */ + vec_foreach (outside_fib, dm->outside_fibs) + { + if (outside_fib->fib_index == fib_index) + { + if (!is_del) + { + outside_fib->refcount++; + } + else + { + outside_fib->refcount--; + if (!outside_fib->refcount) + { + vec_del1 (dm->outside_fibs, + outside_fib - dm->outside_fibs); + } + } + found = 1; + break; + } + } + /* *INDENT-ON* */ + if (!is_del && !found) + { + vec_add2 (dm->outside_fibs, outside_fib, 1); + outside_fib->fib_index = fib_index; + outside_fib->refcount = 1; + } + // add/del outside address to FIB + snat_det_map_t *mp; + /* *INDENT-OFF* */ + pool_foreach (mp, dm->det_maps, ({ + det44_add_del_addr_to_fib(&mp->out_addr, + mp->out_plen, sw_if_index, !is_del); + })); + /* *INDENT-ON* */ + } + return 0; +} + +/** + * @brief The 'det44-expire-walk' process's main loop. + * + * Check expire time for active sessions. + */ +static uword +det44_expire_walk_fn (vlib_main_t * vm, vlib_node_runtime_t * rt, + vlib_frame_t * f) +{ + det44_main_t *dm = &det44_main; + snat_det_session_t *ses; + snat_det_map_t *mp; + + vlib_process_wait_for_event_or_clock (vm, 10.0); + vlib_process_get_events (vm, NULL); + u32 now = (u32) vlib_time_now (vm); + /* *INDENT-OFF* */ + pool_foreach (mp, dm->det_maps, ({ + vec_foreach(ses, mp->sessions) + { + /* Delete if session expired */ + if (ses->in_port && (ses->expire < now)) + snat_det_ses_close (mp, ses); + } + })); + /* *INDENT-ON* */ + return 0; +} + +void +det44_create_expire_walk_process () +{ + det44_main_t *dm = &det44_main; + + if (dm->expire_walk_node_index) + return; + + dm->expire_walk_node_index = vlib_process_create (vlib_get_main (), + "det44-expire-walk", + det44_expire_walk_fn, + 16 /* stack_bytes */ ); +} + +int +det44_plugin_enable (det44_config_t c) +{ + det44_main_t *dm = &det44_main; + + if (plugin_enabled () == 1) + { + det44_log_err ("plugin already enabled!"); + return 1; + } + + det44_log_err ("inside %u, outside %u", c.inside_vrf_id, c.outside_vrf_id); + + dm->outside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, + c.outside_vrf_id, + dm->fib_src_hi); + dm->inside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, + c.inside_vrf_id, + dm->fib_src_hi); + + det44_create_expire_walk_process (); + dm->mss_clamping = 0; + dm->config = c; + dm->enabled = 1; + return 0; +} + +int +det44_plugin_disable () +{ + det44_main_t *dm = &det44_main; + det44_interface_t *i, *interfaces; + snat_det_map_t *mp; + int rv = 0; + + if (plugin_enabled () == 0) + { + det44_log_err ("plugin already disabled!"); + return 1; + } + + // DET44 cleanup (order dependent) + // 1) remove interfaces (det44_interface_add_del) removes map ranges from fib + // 2) free sessions + // 3) free maps + + interfaces = vec_dup (dm->interfaces); + vec_foreach (i, interfaces) + { + vnet_main_t *vnm = vnet_get_main (); + + if (i->flags & DET44_INTERFACE_FLAG_IS_INSIDE) + { + rv = det44_interface_add_del (i->sw_if_index, i->flags, 1); + if (rv) + { + det44_log_err ("inside interface %U del failed", + unformat_vnet_sw_interface, vnm, i->sw_if_index); + } + } + + if (i->flags & DET44_INTERFACE_FLAG_IS_OUTSIDE) + { + rv = det44_interface_add_del (i->sw_if_index, i->flags, 1); + if (rv) + { + det44_log_err ("outside interface %U del failed", + unformat_vnet_sw_interface, vnm, i->sw_if_index); + } + + } + } + vec_free (interfaces); + + /* *INDENT-OFF* */ + pool_foreach (mp, dm->det_maps, + ({ + vec_free (mp->sessions); + })); + /* *INDENT-ON* */ + + det44_reset_timeouts (); + dm->enabled = 0; + + pool_free (dm->interfaces); + pool_free (dm->det_maps); + + return rv; +} + +static void +det44_update_outside_fib (ip4_main_t * im, + uword opaque, + u32 sw_if_index, u32 new_fib_index, + u32 old_fib_index) +{ + det44_main_t *dm = &det44_main; + + det44_fib_t *outside_fib; + det44_interface_t *i; + + u8 is_add = 1; + u8 match = 0; + + if (plugin_enabled () == 0) + return; + + if (new_fib_index == old_fib_index) + return; + + if (!vec_len (dm->outside_fibs)) + return; + + /* *INDENT-OFF* */ + pool_foreach (i, dm->interfaces, + ({ + if (i->sw_if_index == sw_if_index) + { + if (!(det44_interface_is_outside (i))) + return; + match = 1; + } + })); + /* *INDENT-ON* */ + + if (!match) + return; + + vec_foreach (outside_fib, dm->outside_fibs) + { + if (outside_fib->fib_index == old_fib_index) + { + outside_fib->refcount--; + if (!outside_fib->refcount) + vec_del1 (dm->outside_fibs, outside_fib - dm->outside_fibs); + break; + } + } + + vec_foreach (outside_fib, dm->outside_fibs) + { + if (outside_fib->fib_index == new_fib_index) + { + outside_fib->refcount++; + is_add = 0; + break; + } + } + + if (is_add) + { + vec_add2 (dm->outside_fibs, outside_fib, 1); + outside_fib->refcount = 1; + outside_fib->fib_index = new_fib_index; + } +} + +static clib_error_t * +det44_init (vlib_main_t * vm) +{ + det44_main_t *dm = &det44_main; + ip4_table_bind_callback_t cb; + vlib_node_t *node; + + clib_memset (dm, 0, sizeof (*dm)); + + dm->ip4_main = &ip4_main; + dm->log_class = vlib_log_register_class ("det44", 0); + + node = vlib_get_node_by_name (vm, (u8 *) "det44-in2out"); + dm->in2out_node_index = node->index; + node = vlib_get_node_by_name (vm, (u8 *) "det44-out2in"); + dm->out2in_node_index = node->index; + + dm->fib_src_hi = fib_source_allocate ("det44-hi", + FIB_SOURCE_PRIORITY_HI, + FIB_SOURCE_BH_SIMPLE); + dm->fib_src_low = fib_source_allocate ("det44-low", + FIB_SOURCE_PRIORITY_LOW, + FIB_SOURCE_BH_SIMPLE); + + cb.function = det44_update_outside_fib; + cb.function_opaque = 0; + vec_add1 (dm->ip4_main->table_bind_callbacks, cb); + + det44_reset_timeouts (); + return det44_api_hookup (vm); +} + +VLIB_INIT_FUNCTION (det44_init); + +u8 * +format_det44_session_state (u8 * s, va_list * args) +{ + u32 i = va_arg (*args, u32); + u8 *t = 0; + + switch (i) + { +#define _(v, N, str) case DET44_SESSION_##N: t = (u8 *) str; break; + foreach_det44_session_state +#undef _ + default: + t = format (t, "unknown"); + } + s = format (s, "%s", t); + return s; +} + +u8 * +format_det_map_ses (u8 * s, va_list * args) +{ + snat_det_map_t *det_map = va_arg (*args, snat_det_map_t *); + ip4_address_t in_addr, out_addr; + u32 in_offset, out_offset; + snat_det_session_t *ses = va_arg (*args, snat_det_session_t *); + u32 *i = va_arg (*args, u32 *); + + u32 user_index = *i / DET44_SES_PER_USER; + in_addr.as_u32 = + clib_host_to_net_u32 (clib_net_to_host_u32 (det_map->in_addr.as_u32) + + user_index); + in_offset = + clib_net_to_host_u32 (in_addr.as_u32) - + clib_net_to_host_u32 (det_map->in_addr.as_u32); + out_offset = in_offset / det_map->sharing_ratio; + out_addr.as_u32 = + clib_host_to_net_u32 (clib_net_to_host_u32 (det_map->out_addr.as_u32) + + out_offset); + s = + format (s, + "in %U:%d out %U:%d external host %U:%d state: %U expire: %d\n", + format_ip4_address, &in_addr, clib_net_to_host_u16 (ses->in_port), + format_ip4_address, &out_addr, + clib_net_to_host_u16 (ses->out.out_port), format_ip4_address, + &ses->out.ext_host_addr, + clib_net_to_host_u16 (ses->out.ext_host_port), + format_det44_session_state, ses->state, ses->expire); + + return s; +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/nat/det44/det44.h b/src/plugins/nat/det44/det44.h new file mode 100644 index 00000000000..3ddba6d1405 --- /dev/null +++ b/src/plugins/nat/det44/det44.h @@ -0,0 +1,449 @@ +/* + * det44.h - deterministic NAT definitions + * + * Copyright (c) 2020 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief Deterministic NAT (CGN) definitions + */ + +#ifndef __included_det44_h__ +#define __included_det44_h__ + +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/ip/icmp46_packet.h> +#include <vnet/api_errno.h> +#include <vnet/fib/fib_source.h> +#include <vppinfra/dlist.h> +#include <vppinfra/error.h> +#include <vlibapi/api.h> +#include <vlib/log.h> +#include <vnet/fib/fib_table.h> +#include <vnet/fib/ip4_fib.h> +#include <vnet/ip/reass/ip4_sv_reass.h> + +#include <nat/lib/lib.h> +#include <nat/lib/inlines.h> + +/* Session state */ +#define foreach_det44_session_state \ + _(0, UNKNOWN, "unknown") \ + _(1, UDP_ACTIVE, "udp-active") \ + _(2, TCP_SYN_SENT, "tcp-syn-sent") \ + _(3, TCP_ESTABLISHED, "tcp-established") \ + _(4, TCP_FIN_WAIT, "tcp-fin-wait") \ + _(5, TCP_CLOSE_WAIT, "tcp-close-wait") \ + _(6, TCP_CLOSING, "tcp-closing") \ + _(7, TCP_LAST_ACK, "tcp-last-ack") \ + _(8, TCP_CLOSED, "tcp-closed") \ + _(9, ICMP_ACTIVE, "icmp-active") + +typedef enum +{ +#define _(v, N, s) DET44_SESSION_##N = v, + foreach_det44_session_state +#undef _ +} det44_session_state_t; + +#define DET44_SES_PER_USER 1000 + +typedef struct +{ + u16 identifier; + u16 sequence; +} icmp_echo_header_t; + +typedef struct +{ + u16 src_port, dst_port; +} tcp_udp_header_t; + +typedef struct +{ + u32 cached_sw_if_index; + u32 cached_ip4_address; +} det44_runtime_t; + +typedef struct nat_timeouts_s +{ + u32 udp; + + struct + { + u32 transitory; + u32 established; + } tcp; + + u32 icmp; + +} nat_timeouts_t; + +/* deterministic session outside key */ +typedef struct +{ + union + { + struct + { + ip4_address_t ext_host_addr; + u16 ext_host_port; + u16 out_port; + }; + u64 as_u64; + }; +} snat_det_out_key_t; + +typedef struct +{ + /* Inside network port */ + u16 in_port; + /* Outside network address and port */ + snat_det_out_key_t out; + /* Session state */ + u8 state; + /* Expire timeout */ + u32 expire; +} snat_det_session_t; + +typedef struct +{ + /* inside IP address range */ + ip4_address_t in_addr; + u8 in_plen; + /* outside IP address range */ + ip4_address_t out_addr; + u8 out_plen; + /* inside IP addresses / outside IP addresses */ + u32 sharing_ratio; + /* number of ports available to internal host */ + u16 ports_per_host; + /* session counter */ + u32 ses_num; + /* vector of sessions */ + snat_det_session_t *sessions; +} snat_det_map_t; + +typedef struct +{ + u32 sw_if_index; + u8 flags; +} det44_interface_t; + +typedef struct +{ + + u32 outside_vrf_id; + u32 inside_vrf_id; + +} det44_config_t; + +typedef struct +{ + u32 fib_index; + u32 refcount; +} det44_fib_t; + +typedef struct det44_main_s +{ + det44_config_t config; + + u32 outside_fib_index; + u32 inside_fib_index; + + /* Vector of outside fibs */ + det44_fib_t *outside_fibs; + + fib_source_t fib_src_hi; + fib_source_t fib_src_low; + + u32 out2in_node_index; + u32 in2out_node_index; + + /* Deterministic NAT mappings */ + snat_det_map_t *det_maps; + + /* TCP MSS clamping */ + u16 mss_clamping; + + /* Protocol timeouts */ + nat_timeouts_t timeouts; + + /* Expire walk process node index */ + u32 expire_walk_node_index; + + u32 enabled; + + /* API message ID base */ + u16 msg_id_base; + + /* log class */ + vlib_log_class_t log_class; + + det44_interface_t *interfaces; + + /* convenience */ + ip4_main_t *ip4_main; + /* required */ + vnet_main_t *vnet_main; + +} det44_main_t; + +extern det44_main_t det44_main; + +/* logging */ +#define det44_log_err(...) \ + vlib_log(VLIB_LOG_LEVEL_ERR, det44_main.log_class, __VA_ARGS__) +#define det44_log_warn(...) \ + vlib_log(VLIB_LOG_LEVEL_WARNING, det44_main.log_class, __VA_ARGS__) +#define det44_log_notice(...) \ + vlib_log(VLIB_LOG_LEVEL_NOTICE, det44_main.log_class, __VA_ARGS__) +#define det44_log_info(...) \ + vlib_log(VLIB_LOG_LEVEL_INFO, det44_main.log_class, __VA_ARGS__) +#define det44_log_debug(...)\ + vlib_log(VLIB_LOG_LEVEL_DEBUG, det44_main.log_class, __VA_ARGS__) + +/* Deterministic NAT interface flags */ +#define DET44_INTERFACE_FLAG_IS_INSIDE 1 +#define DET44_INTERFACE_FLAG_IS_OUTSIDE 2 + +/** \brief Check if Deterministic NAT interface is inside. + @param i Deterministic NAT interface + @return 1 if inside interface +*/ +#define det44_interface_is_inside(i) i->flags & DET44_INTERFACE_FLAG_IS_INSIDE + +/** \brief Check if Deterministic NAT interface is outside. + @param i Deterministic NAT interface + @return 1 if outside interface +*/ +#define det44_interface_is_outside(i) i->flags & DET44_INTERFACE_FLAG_IS_OUTSIDE + +static_always_inline u8 +plugin_enabled () +{ + det44_main_t *dm = &det44_main; + return dm->enabled; +} + +extern vlib_node_registration_t det44_in2out_node; +extern vlib_node_registration_t det44_out2in_node; + +int det44_plugin_enable (); +int det44_plugin_disable (); + +int det44_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del); + +int det44_set_timeouts (nat_timeouts_t * timeouts); +nat_timeouts_t det44_get_timeouts (); +void det44_reset_timeouts (); + +/* format functions */ +format_function_t format_det_map_ses; + +int snat_det_add_map (ip4_address_t * in_addr, u8 in_plen, + ip4_address_t * out_addr, u8 out_plen, int is_add); + +/* icmp session match functions */ +u32 icmp_match_out2in_det (vlib_node_runtime_t * node, + u32 thread_index, vlib_buffer_t * b0, + ip4_header_t * ip0, ip4_address_t * addr, + u16 * port, u32 * fib_index, + nat_protocol_t * proto, void *d, void *e, + u8 * dont_translate); +u32 icmp_match_in2out_det (vlib_node_runtime_t * node, + u32 thread_index, vlib_buffer_t * b0, + ip4_header_t * ip0, ip4_address_t * addr, + u16 * port, u32 * fib_index, + nat_protocol_t * proto, void *d, void *e, + u8 * dont_translate); +u32 det44_icmp_in2out (vlib_buffer_t * b0, ip4_header_t * ip0, + icmp46_header_t * icmp0, u32 sw_if_index0, + u32 rx_fib_index0, vlib_node_runtime_t * node, + u32 next0, u32 thread_index, void *d, void *e); +u32 det44_icmp_out2in (vlib_buffer_t * b0, ip4_header_t * ip0, + icmp46_header_t * icmp0, u32 sw_if_index0, + u32 rx_fib_index0, vlib_node_runtime_t * node, + u32 next0, u32 thread_index, void *d, void *e); + +static_always_inline int +is_addr_in_net (ip4_address_t * addr, ip4_address_t * net, u8 plen) +{ + if (net->as_u32 == (addr->as_u32 & ip4_main.fib_masks[plen])) + return 1; + return 0; +} + +static_always_inline snat_det_map_t * +snat_det_map_by_user (ip4_address_t * user_addr) +{ + det44_main_t *dm = &det44_main; + snat_det_map_t *mp; + /* *INDENT-OFF* */ + pool_foreach (mp, dm->det_maps, + ({ + if (is_addr_in_net(user_addr, &mp->in_addr, mp->in_plen)) + return mp; + })); + /* *INDENT-ON* */ + return 0; +} + +static_always_inline snat_det_map_t * +snat_det_map_by_out (ip4_address_t * out_addr) +{ + det44_main_t *dm = &det44_main; + snat_det_map_t *mp; + /* *INDENT-OFF* */ + pool_foreach (mp, dm->det_maps, + ({ + if (is_addr_in_net(out_addr, &mp->out_addr, mp->out_plen)) + return mp; + })); + /* *INDENT-ON* */ + return 0; +} + +static_always_inline void +snat_det_forward (snat_det_map_t * dm, ip4_address_t * in_addr, + ip4_address_t * out_addr, u16 * lo_port) +{ + u32 in_offset, out_offset; + + in_offset = clib_net_to_host_u32 (in_addr->as_u32) - + clib_net_to_host_u32 (dm->in_addr.as_u32); + out_offset = in_offset / dm->sharing_ratio; + out_addr->as_u32 = + clib_host_to_net_u32 (clib_net_to_host_u32 (dm->out_addr.as_u32) + + out_offset); + *lo_port = 1024 + dm->ports_per_host * (in_offset % dm->sharing_ratio); +} + +static_always_inline void +snat_det_reverse (snat_det_map_t * dm, ip4_address_t * out_addr, u16 out_port, + ip4_address_t * in_addr) +{ + u32 in_offset1, in_offset2, out_offset; + + out_offset = clib_net_to_host_u32 (out_addr->as_u32) - + clib_net_to_host_u32 (dm->out_addr.as_u32); + in_offset1 = out_offset * dm->sharing_ratio; + in_offset2 = (out_port - 1024) / dm->ports_per_host; + in_addr->as_u32 = + clib_host_to_net_u32 (clib_net_to_host_u32 (dm->in_addr.as_u32) + + in_offset1 + in_offset2); +} + +static_always_inline u32 +snat_det_user_ses_offset (ip4_address_t * addr, u8 plen) +{ + return (clib_net_to_host_u32 (addr->as_u32) & pow2_mask (32 - plen)) * + DET44_SES_PER_USER; +} + +static_always_inline snat_det_session_t * +snat_det_get_ses_by_out (snat_det_map_t * dm, ip4_address_t * in_addr, + u64 out_key) +{ + u32 user_offset; + u16 i; + + user_offset = snat_det_user_ses_offset (in_addr, dm->in_plen); + for (i = 0; i < DET44_SES_PER_USER; i++) + { + if (dm->sessions[i + user_offset].out.as_u64 == out_key) + return &dm->sessions[i + user_offset]; + } + + return 0; +} + +static_always_inline snat_det_session_t * +snat_det_find_ses_by_in (snat_det_map_t * dm, ip4_address_t * in_addr, + u16 in_port, snat_det_out_key_t out_key) +{ + snat_det_session_t *ses; + u32 user_offset; + u16 i; + + user_offset = snat_det_user_ses_offset (in_addr, dm->in_plen); + for (i = 0; i < DET44_SES_PER_USER; i++) + { + ses = &dm->sessions[i + user_offset]; + if (ses->in_port == in_port && + ses->out.ext_host_addr.as_u32 == out_key.ext_host_addr.as_u32 && + ses->out.ext_host_port == out_key.ext_host_port) + return &dm->sessions[i + user_offset]; + } + + return 0; +} + +static_always_inline snat_det_session_t * +snat_det_ses_create (u32 thread_index, snat_det_map_t * dm, + ip4_address_t * in_addr, u16 in_port, + snat_det_out_key_t * out) +{ + u32 user_offset; + u16 i; + + user_offset = snat_det_user_ses_offset (in_addr, dm->in_plen); + + for (i = 0; i < DET44_SES_PER_USER; i++) + { + if (!dm->sessions[i + user_offset].in_port) + { + if (clib_atomic_bool_cmp_and_swap + (&dm->sessions[i + user_offset].in_port, 0, in_port)) + { + dm->sessions[i + user_offset].out.as_u64 = out->as_u64; + dm->sessions[i + user_offset].state = DET44_SESSION_UNKNOWN; + dm->sessions[i + user_offset].expire = 0; + clib_atomic_add_fetch (&dm->ses_num, 1); + return &dm->sessions[i + user_offset]; + } + } + } + + // TODO: + /*snat_ipfix_logging_max_entries_per_user (thread_index, + DET44_SES_PER_USER, + in_addr->as_u32); */ + return 0; +} + +static_always_inline void +snat_det_ses_close (snat_det_map_t * dm, snat_det_session_t * ses) +{ + if (clib_atomic_bool_cmp_and_swap (&ses->in_port, ses->in_port, 0)) + { + ses->out.as_u64 = 0; + clib_atomic_add_fetch (&dm->ses_num, -1); + } +} + +clib_error_t *det44_api_hookup (vlib_main_t * vm); + +#endif /* __included_det44_h__ */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/nat/det44/det44_api.c b/src/plugins/nat/det44/det44_api.c new file mode 100644 index 00000000000..7c7b1788009 --- /dev/null +++ b/src/plugins/nat/det44/det44_api.c @@ -0,0 +1,633 @@ +/* + * Copyright (c) 2020 Cisco and/or its affiliates. + * * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief Deterministic NAT (CGN) plugin API implementation + */ + +#include <vnet/ip/ip_types_api.h> +#include <nat/det44/det44.h> +#include <nat/det44/det44.api_enum.h> +#include <nat/det44/det44.api_types.h> +#include <vnet/fib/fib_table.h> +#include <vnet/ip/ip.h> + +#include <vlibmemory/api.h> + +#define REPLY_MSG_ID_BASE dm->msg_id_base +#include <vlibapi/api_helper_macros.h> + +static void +vl_api_det44_add_del_map_t_handler (vl_api_det44_add_del_map_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_add_del_map_reply_t *rmp; + int rv = 0; + ip4_address_t in_addr, out_addr; + clib_memcpy (&in_addr, mp->in_addr, 4); + clib_memcpy (&out_addr, mp->out_addr, 4); + rv = snat_det_add_map (&in_addr, mp->in_plen, &out_addr, + mp->out_plen, mp->is_add); + REPLY_MACRO (VL_API_DET44_ADD_DEL_MAP_REPLY); +} + +static void +vl_api_det44_forward_t_handler (vl_api_det44_forward_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_forward_reply_t *rmp; + int rv = 0; + u16 lo_port = 0, hi_port = 0; + snat_det_map_t *m; + ip4_address_t in_addr, out_addr; + + out_addr.as_u32 = 0; + clib_memcpy (&in_addr, mp->in_addr, 4); + m = snat_det_map_by_user (&in_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + + snat_det_forward (m, &in_addr, &out_addr, &lo_port); + hi_port = lo_port + m->ports_per_host - 1; + +send_reply: + /* *INDENT-OFF* */ + REPLY_MACRO2 (VL_API_DET44_FORWARD_REPLY, + ({ + rmp->out_port_lo = ntohs (lo_port); + rmp->out_port_hi = ntohs (hi_port); + clib_memcpy (rmp->out_addr, &out_addr, 4); + })) + /* *INDENT-ON* */ +} + +static void +vl_api_det44_reverse_t_handler (vl_api_det44_reverse_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_reverse_reply_t *rmp; + int rv = 0; + ip4_address_t out_addr, in_addr; + snat_det_map_t *m; + + in_addr.as_u32 = 0; + clib_memcpy (&out_addr, mp->out_addr, 4); + m = snat_det_map_by_out (&out_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + + snat_det_reverse (m, &out_addr, htons (mp->out_port), &in_addr); + +send_reply: + /* *INDENT-OFF* */ + REPLY_MACRO2 (VL_API_DET44_REVERSE_REPLY, + ({ + clib_memcpy (rmp->in_addr, &in_addr, 4); + })) + /* *INDENT-ON* */ +} + +static void +sent_det44_map_details (snat_det_map_t * m, vl_api_registration_t * reg, + u32 context) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_map_details_t *rmp; + + rmp = vl_msg_api_alloc (sizeof (*rmp)); + clib_memset (rmp, 0, sizeof (*rmp)); + rmp->_vl_msg_id = ntohs (VL_API_DET44_MAP_DETAILS + dm->msg_id_base); + clib_memcpy (rmp->in_addr, &m->in_addr, 4); + rmp->in_plen = m->in_plen; + clib_memcpy (rmp->out_addr, &m->out_addr, 4); + rmp->out_plen = m->out_plen; + rmp->sharing_ratio = htonl (m->sharing_ratio); + rmp->ports_per_host = htons (m->ports_per_host); + rmp->ses_num = htonl (m->ses_num); + rmp->context = context; + + vl_api_send_msg (reg, (u8 *) rmp); +} + +static void +vl_api_det44_map_dump_t_handler (vl_api_det44_map_dump_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_registration_t *reg; + snat_det_map_t *m; + + reg = vl_api_client_index_to_registration (mp->client_index); + if (!reg) + return; + + /* *INDENT-OFF* */ + vec_foreach(m, dm->det_maps) + sent_det44_map_details(m, reg, mp->context); + /* *INDENT-ON* */ +} + +static void +vl_api_det44_close_session_out_t_handler (vl_api_det44_close_session_out_t + * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_close_session_out_reply_t *rmp; + ip4_address_t out_addr, ext_addr, in_addr; + snat_det_out_key_t key; + snat_det_map_t *m; + snat_det_session_t *ses; + int rv = 0; + + clib_memcpy (&out_addr, mp->out_addr, 4); + clib_memcpy (&ext_addr, mp->ext_addr, 4); + + m = snat_det_map_by_out (&out_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + snat_det_reverse (m, &ext_addr, ntohs (mp->out_port), &in_addr); + key.ext_host_addr = ext_addr; + key.ext_host_port = mp->ext_port; + key.out_port = mp->out_port; + ses = snat_det_get_ses_by_out (m, &in_addr, key.as_u64); + if (!ses) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + snat_det_ses_close (m, ses); + +send_reply: + REPLY_MACRO (VL_API_DET44_CLOSE_SESSION_OUT_REPLY); +} + +static void +vl_api_det44_close_session_in_t_handler (vl_api_det44_close_session_in_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_close_session_in_reply_t *rmp; + ip4_address_t in_addr, ext_addr; + snat_det_out_key_t key; + snat_det_map_t *m; + snat_det_session_t *ses; + int rv = 0; + + clib_memcpy (&in_addr, mp->in_addr, 4); + clib_memcpy (&ext_addr, mp->ext_addr, 4); + + m = snat_det_map_by_user (&in_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + key.ext_host_addr = ext_addr; + key.ext_host_port = mp->ext_port; + ses = snat_det_find_ses_by_in (m, &in_addr, mp->in_port, key); + if (!ses) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + snat_det_ses_close (m, ses); + +send_reply: + REPLY_MACRO (VL_API_DET44_CLOSE_SESSION_OUT_REPLY); +} + +static void +send_det44_session_details (snat_det_session_t * s, + vl_api_registration_t * reg, u32 context) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_session_details_t *rmp; + + rmp = vl_msg_api_alloc (sizeof (*rmp)); + clib_memset (rmp, 0, sizeof (*rmp)); + rmp->_vl_msg_id = ntohs (VL_API_DET44_SESSION_DETAILS + dm->msg_id_base); + rmp->in_port = s->in_port; + clib_memcpy (rmp->ext_addr, &s->out.ext_host_addr, 4); + rmp->ext_port = s->out.ext_host_port; + rmp->out_port = s->out.out_port; + rmp->state = s->state; + rmp->expire = ntohl (s->expire); + rmp->context = context; + + vl_api_send_msg (reg, (u8 *) rmp); +} + +static void +vl_api_det44_session_dump_t_handler (vl_api_det44_session_dump_t * mp) +{ + vl_api_registration_t *reg; + ip4_address_t user_addr; + snat_det_map_t *m; + snat_det_session_t *s, empty_ses; + u16 i; + + reg = vl_api_client_index_to_registration (mp->client_index); + if (!reg) + return; + + clib_memset (&empty_ses, 0, sizeof (empty_ses)); + clib_memcpy (&user_addr, mp->user_addr, 4); + m = snat_det_map_by_user (&user_addr); + if (!m) + return; + + s = m->sessions + snat_det_user_ses_offset (&user_addr, m->in_plen); + for (i = 0; i < DET44_SES_PER_USER; i++) + { + if (s->out.as_u64) + send_det44_session_details (s, reg, mp->context); + s++; + } +} + +static void + vl_api_det44_plugin_enable_disable_t_handler + (vl_api_det44_plugin_enable_disable_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_plugin_enable_disable_reply_t *rmp; + det44_config_t c = { 0 }; + int rv = 0; + if (mp->enable) + { + c.outside_vrf_id = ntohl (mp->outside_vrf); + c.inside_vrf_id = ntohl (mp->inside_vrf); + rv = det44_plugin_enable (c); + } + else + { + rv = det44_plugin_disable (); + } + REPLY_MACRO (VL_API_DET44_PLUGIN_ENABLE_DISABLE_REPLY); +} + +static void + vl_api_det44_interface_add_del_feature_t_handler + (vl_api_det44_interface_add_del_feature_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_interface_add_del_feature_reply_t *rmp; + u32 sw_if_index = ntohl (mp->sw_if_index); + int rv = 0; + VALIDATE_SW_IF_INDEX (mp); + rv = det44_interface_add_del (sw_if_index, mp->is_inside, !mp->is_add); + BAD_SW_IF_INDEX_LABEL; + REPLY_MACRO (VL_API_DET44_INTERFACE_ADD_DEL_FEATURE_REPLY); +} + +static void +det44_send_interface_details (det44_interface_t * i, + vl_api_registration_t * reg, u32 context) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_interface_details_t *rmp; + + rmp = vl_msg_api_alloc (sizeof (*rmp)); + clib_memset (rmp, 0, sizeof (*rmp)); + rmp->_vl_msg_id = ntohs (VL_API_DET44_INTERFACE_DETAILS + dm->msg_id_base); + rmp->sw_if_index = ntohl (i->sw_if_index); + rmp->is_outside = det44_interface_is_outside (i); + rmp->is_inside = det44_interface_is_inside (i); + rmp->context = context; + vl_api_send_msg (reg, (u8 *) rmp); +} + +static void +vl_api_det44_interface_dump_t_handler (vl_api_det44_interface_dump_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_registration_t *reg; + det44_interface_t *i; + + reg = vl_api_client_index_to_registration (mp->client_index); + if (!reg) + return; + + /* *INDENT-OFF* */ + pool_foreach (i, dm->interfaces, + ({ + det44_send_interface_details(i, reg, mp->context); + })); + /* *INDENT-ON* */ +} + +static void +vl_api_det44_set_timeouts_t_handler (vl_api_det44_set_timeouts_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_set_timeouts_reply_t *rmp; + nat_timeouts_t timeouts; + int rv = 0; + timeouts.udp = ntohl (mp->udp); + timeouts.tcp.established = ntohl (mp->tcp_established); + timeouts.tcp.transitory = ntohl (mp->tcp_transitory); + timeouts.icmp = ntohl (mp->icmp); + rv = det44_set_timeouts (&timeouts); + REPLY_MACRO (VL_API_DET44_SET_TIMEOUTS_REPLY); +} + +static void +vl_api_det44_get_timeouts_t_handler (vl_api_det44_get_timeouts_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_det44_get_timeouts_reply_t *rmp; + nat_timeouts_t timeouts; + int rv = 0; + timeouts = det44_get_timeouts (); + /* *INDENT-OFF* */ + REPLY_MACRO2 (VL_API_DET44_GET_TIMEOUTS_REPLY, + ({ + rmp->udp = htonl (timeouts.udp); + rmp->tcp_established = htonl (timeouts.tcp.established); + rmp->tcp_transitory = htonl (timeouts.tcp.transitory); + rmp->icmp = htonl (timeouts.icmp); + })) + /* *INDENT-ON* */ +} + +/* + * Obsolete deterministic API to be removed + */ + +static void +vl_api_nat_det_add_del_map_t_handler (vl_api_nat_det_add_del_map_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_nat_det_add_del_map_reply_t *rmp; + int rv = 0; + ip4_address_t in_addr, out_addr; + + clib_memcpy (&in_addr, mp->in_addr, 4); + clib_memcpy (&out_addr, mp->out_addr, 4); + rv = snat_det_add_map (&in_addr, mp->in_plen, &out_addr, + mp->out_plen, mp->is_add); + REPLY_MACRO (VL_API_NAT_DET_ADD_DEL_MAP_REPLY); +} + +static void +vl_api_nat_det_forward_t_handler (vl_api_nat_det_forward_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_nat_det_forward_reply_t *rmp; + int rv = 0; + u16 lo_port = 0, hi_port = 0; + snat_det_map_t *m; + ip4_address_t in_addr, out_addr; + + out_addr.as_u32 = 0; + clib_memcpy (&in_addr, mp->in_addr, 4); + m = snat_det_map_by_user (&in_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + + snat_det_forward (m, &in_addr, &out_addr, &lo_port); + hi_port = lo_port + m->ports_per_host - 1; + +send_reply: + /* *INDENT-OFF* */ + REPLY_MACRO2 (VL_API_NAT_DET_FORWARD_REPLY, + ({ + rmp->out_port_lo = ntohs (lo_port); + rmp->out_port_hi = ntohs (hi_port); + clib_memcpy (rmp->out_addr, &out_addr, 4); + })) + /* *INDENT-ON* */ +} + +static void +vl_api_nat_det_reverse_t_handler (vl_api_nat_det_reverse_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_nat_det_reverse_reply_t *rmp; + int rv = 0; + ip4_address_t out_addr, in_addr; + snat_det_map_t *m; + + in_addr.as_u32 = 0; + clib_memcpy (&out_addr, mp->out_addr, 4); + m = snat_det_map_by_out (&out_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + + snat_det_reverse (m, &out_addr, htons (mp->out_port), &in_addr); + +send_reply: + /* *INDENT-OFF* */ + REPLY_MACRO2 (VL_API_NAT_DET_REVERSE_REPLY, + ({ + clib_memcpy (rmp->in_addr, &in_addr, 4); + })) + /* *INDENT-ON* */ +} + +static void +sent_nat_det_map_details (snat_det_map_t * m, vl_api_registration_t * reg, + u32 context) +{ + det44_main_t *dm = &det44_main; + vl_api_nat_det_map_details_t *rmp; + + rmp = vl_msg_api_alloc (sizeof (*rmp)); + clib_memset (rmp, 0, sizeof (*rmp)); + rmp->_vl_msg_id = ntohs (VL_API_NAT_DET_MAP_DETAILS + dm->msg_id_base); + clib_memcpy (rmp->in_addr, &m->in_addr, 4); + rmp->in_plen = m->in_plen; + clib_memcpy (rmp->out_addr, &m->out_addr, 4); + rmp->out_plen = m->out_plen; + rmp->sharing_ratio = htonl (m->sharing_ratio); + rmp->ports_per_host = htons (m->ports_per_host); + rmp->ses_num = htonl (m->ses_num); + rmp->context = context; + + vl_api_send_msg (reg, (u8 *) rmp); +} + +static void +vl_api_nat_det_map_dump_t_handler (vl_api_nat_det_map_dump_t * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_registration_t *reg; + snat_det_map_t *m; + + reg = vl_api_client_index_to_registration (mp->client_index); + if (!reg) + return; + + /* *INDENT-OFF* */ + vec_foreach(m, dm->det_maps) + sent_nat_det_map_details(m, reg, mp->context); + /* *INDENT-ON* */ +} + +static void +vl_api_nat_det_close_session_out_t_handler (vl_api_nat_det_close_session_out_t + * mp) +{ + det44_main_t *dm = &det44_main; + vl_api_nat_det_close_session_out_reply_t *rmp; + ip4_address_t out_addr, ext_addr, in_addr; + snat_det_out_key_t key; + snat_det_map_t *m; + snat_det_session_t *ses; + int rv = 0; + + clib_memcpy (&out_addr, mp->out_addr, 4); + clib_memcpy (&ext_addr, mp->ext_addr, 4); + + m = snat_det_map_by_out (&out_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + snat_det_reverse (m, &ext_addr, ntohs (mp->out_port), &in_addr); + key.ext_host_addr = ext_addr; + key.ext_host_port = mp->ext_port; + key.out_port = mp->out_port; + ses = snat_det_get_ses_by_out (m, &in_addr, key.as_u64); + if (!ses) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + snat_det_ses_close (m, ses); + +send_reply: + REPLY_MACRO (VL_API_NAT_DET_CLOSE_SESSION_OUT_REPLY); +} + +static void +vl_api_nat_det_close_session_in_t_handler (vl_api_nat_det_close_session_in_t * + mp) +{ + det44_main_t *dm = &det44_main; + vl_api_nat_det_close_session_in_reply_t *rmp; + ip4_address_t in_addr, ext_addr; + snat_det_out_key_t key; + snat_det_map_t *m; + snat_det_session_t *ses; + int rv = 0; + + clib_memcpy (&in_addr, mp->in_addr, 4); + clib_memcpy (&ext_addr, mp->ext_addr, 4); + + m = snat_det_map_by_user (&in_addr); + if (!m) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + key.ext_host_addr = ext_addr; + key.ext_host_port = mp->ext_port; + ses = snat_det_find_ses_by_in (m, &in_addr, mp->in_port, key); + if (!ses) + { + rv = VNET_API_ERROR_NO_SUCH_ENTRY; + goto send_reply; + } + snat_det_ses_close (m, ses); + +send_reply: + REPLY_MACRO (VL_API_NAT_DET_CLOSE_SESSION_OUT_REPLY); +} + +static void +send_nat_det_session_details (snat_det_session_t * s, + vl_api_registration_t * reg, u32 context) +{ + det44_main_t *dm = &det44_main; + vl_api_nat_det_session_details_t *rmp; + + rmp = vl_msg_api_alloc (sizeof (*rmp)); + clib_memset (rmp, 0, sizeof (*rmp)); + rmp->_vl_msg_id = ntohs (VL_API_NAT_DET_SESSION_DETAILS + dm->msg_id_base); + rmp->in_port = s->in_port; + clib_memcpy (rmp->ext_addr, &s->out.ext_host_addr, 4); + rmp->ext_port = s->out.ext_host_port; + rmp->out_port = s->out.out_port; + rmp->state = s->state; + rmp->expire = ntohl (s->expire); + rmp->context = context; + + vl_api_send_msg (reg, (u8 *) rmp); +} + +static void +vl_api_nat_det_session_dump_t_handler (vl_api_nat_det_session_dump_t * mp) +{ + vl_api_registration_t *reg; + ip4_address_t user_addr; + snat_det_map_t *m; + snat_det_session_t *s, empty_ses; + u16 i; + + reg = vl_api_client_index_to_registration (mp->client_index); + if (!reg) + return; + + clib_memset (&empty_ses, 0, sizeof (empty_ses)); + clib_memcpy (&user_addr, mp->user_addr, 4); + m = snat_det_map_by_user (&user_addr); + if (!m) + return; + + s = m->sessions + snat_det_user_ses_offset (&user_addr, m->in_plen); + for (i = 0; i < DET44_SES_PER_USER; i++) + { + if (s->out.as_u64) + send_nat_det_session_details (s, reg, mp->context); + s++; + } +} + +/* API definitions */ +#include <vnet/format_fns.h> +#include <nat/det44/det44.api.c> + +/* Set up the API message handling tables */ +clib_error_t * +det44_api_hookup (vlib_main_t * vm) +{ + det44_main_t *dm = &det44_main; + dm->msg_id_base = setup_message_id_table (); + return 0; +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/nat/det44/det44_cli.c b/src/plugins/nat/det44/det44_cli.c new file mode 100644 index 00000000000..7085eba06ef --- /dev/null +++ b/src/plugins/nat/det44/det44_cli.c @@ -0,0 +1,697 @@ +/* + * Copyright (c) 2020 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +/** + * @file + * @brief DET44 CLI + */ +#include <nat/det44/det44.h> + +static clib_error_t * +det44_map_command_fn (vlib_main_t * vm, unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + ip4_address_t in_addr, out_addr; + u32 in_plen, out_plen; + int is_add = 1, rv; + clib_error_t *error = 0; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat + (line_input, "in %U/%u", unformat_ip4_address, &in_addr, &in_plen)) + ; + else + if (unformat + (line_input, "out %U/%u", unformat_ip4_address, &out_addr, + &out_plen)) + ; + else if (unformat (line_input, "del")) + is_add = 0; + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + } + + rv = snat_det_add_map (&in_addr, (u8) in_plen, &out_addr, (u8) out_plen, + is_add); + + if (rv) + { + error = clib_error_return (0, "snat_det_add_map return %d", rv); + goto done; + } + +done: + unformat_free (line_input); + + return error; +} + +static clib_error_t * +det44_show_mappings_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + det44_main_t *dm = &det44_main; + snat_det_map_t *mp; + vlib_cli_output (vm, "NAT44 deterministic mappings:"); + /* *INDENT-OFF* */ + pool_foreach (mp, dm->det_maps, + ({ + vlib_cli_output (vm, " in %U/%d out %U/%d\n", + format_ip4_address, &mp->in_addr, mp->in_plen, + format_ip4_address, &mp->out_addr, mp->out_plen); + vlib_cli_output (vm, " outside address sharing ratio: %d\n", + mp->sharing_ratio); + vlib_cli_output (vm, " number of ports per inside host: %d\n", + mp->ports_per_host); + vlib_cli_output (vm, " sessions number: %d\n", mp->ses_num); + })); + /* *INDENT-ON* */ + return 0; +} + +static clib_error_t * +det44_forward_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + ip4_address_t in_addr, out_addr; + u16 lo_port; + snat_det_map_t *mp; + clib_error_t *error = 0; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "%U", unformat_ip4_address, &in_addr)) + ; + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + } + + mp = snat_det_map_by_user (&in_addr); + if (!mp) + vlib_cli_output (vm, "no match"); + else + { + snat_det_forward (mp, &in_addr, &out_addr, &lo_port); + vlib_cli_output (vm, "%U:<%d-%d>", format_ip4_address, &out_addr, + lo_port, lo_port + mp->ports_per_host - 1); + } + +done: + unformat_free (line_input); + + return error; +} + +static clib_error_t * +det44_reverse_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + ip4_address_t in_addr, out_addr; + clib_error_t *error = 0; + snat_det_map_t *mp; + u32 out_port; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat + (line_input, "%U:%d", unformat_ip4_address, &out_addr, &out_port)) + ; + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + } + + if (out_port < 1024 || out_port > 65535) + { + error = clib_error_return (0, "wrong port, must be <1024-65535>"); + goto done; + } + + mp = snat_det_map_by_out (&out_addr); + if (!mp) + vlib_cli_output (vm, "no match"); + else + { + snat_det_reverse (mp, &out_addr, (u16) out_port, &in_addr); + vlib_cli_output (vm, "%U", format_ip4_address, &in_addr); + } + +done: + unformat_free (line_input); + + return error; +} + +static clib_error_t * +det44_show_sessions_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + det44_main_t *dm = &det44_main; + snat_det_session_t *ses; + snat_det_map_t *mp; + vlib_cli_output (vm, "NAT44 deterministic sessions:"); + /* *INDENT-OFF* */ + pool_foreach (mp, dm->det_maps, + ({ + int i; + vec_foreach_index (i, mp->sessions) + { + ses = vec_elt_at_index (mp->sessions, i); + if (ses->in_port) + vlib_cli_output (vm, " %U", format_det_map_ses, mp, ses, &i); + } + })); + /* *INDENT-ON* */ + return 0; +} + +static clib_error_t * +det44_close_session_out_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + ip4_address_t out_addr, ext_addr, in_addr; + u32 out_port, ext_port; + snat_det_map_t *mp; + snat_det_session_t *ses; + snat_det_out_key_t key; + clib_error_t *error = 0; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "%U:%d %U:%d", + unformat_ip4_address, &out_addr, &out_port, + unformat_ip4_address, &ext_addr, &ext_port)) + ; + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + } + + unformat_free (line_input); + + mp = snat_det_map_by_out (&out_addr); + if (!mp) + vlib_cli_output (vm, "no match"); + else + { + snat_det_reverse (mp, &ext_addr, (u16) out_port, &in_addr); + key.ext_host_addr = out_addr; + key.ext_host_port = ntohs ((u16) ext_port); + key.out_port = ntohs ((u16) out_port); + ses = snat_det_get_ses_by_out (mp, &out_addr, key.as_u64); + if (!ses) + vlib_cli_output (vm, "no match"); + else + snat_det_ses_close (mp, ses); + } + +done: + unformat_free (line_input); + + return error; +} + +static clib_error_t * +det44_close_session_in_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + ip4_address_t in_addr, ext_addr; + u32 in_port, ext_port; + snat_det_map_t *mp; + snat_det_session_t *ses; + snat_det_out_key_t key; + clib_error_t *error = 0; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "%U:%d %U:%d", + unformat_ip4_address, &in_addr, &in_port, + unformat_ip4_address, &ext_addr, &ext_port)) + ; + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + } + + unformat_free (line_input); + + mp = snat_det_map_by_user (&in_addr); + if (!mp) + vlib_cli_output (vm, "no match"); + else + { + key.ext_host_addr = ext_addr; + key.ext_host_port = ntohs ((u16) ext_port); + ses = + snat_det_find_ses_by_in (mp, &in_addr, ntohs ((u16) in_port), key); + if (!ses) + vlib_cli_output (vm, "no match"); + else + snat_det_ses_close (mp, ses); + } + +done: + unformat_free (line_input); + + return error; +} + +static clib_error_t * +det44_set_timeouts_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + nat_timeouts_t timeouts = { 0 }; + clib_error_t *error = 0; + u8 reset = 0; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "udp %u", &timeouts.udp)); + else if (unformat (line_input, "tcp established %u", + &timeouts.tcp.established)); + else if (unformat (line_input, "tcp transitory %u", + &timeouts.tcp.transitory)); + else if (unformat (line_input, "icmp %u", &timeouts.icmp)); + else if (unformat (line_input, "reset")) + reset = 1; + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + } + + if (!reset) + { + if (det44_set_timeouts (&timeouts)) + { + error = clib_error_return (0, "error configuring timeouts"); + } + } + else + det44_reset_timeouts (); +done: + unformat_free (line_input); + return error; +} + +static clib_error_t * +det44_show_timeouts_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + nat_timeouts_t timeouts; + timeouts = det44_get_timeouts (); + vlib_cli_output (vm, "udp timeout: %dsec", timeouts.udp); + vlib_cli_output (vm, "tcp established timeout: %dsec", + timeouts.tcp.established); + vlib_cli_output (vm, "tcp transitory timeout: %dsec", + timeouts.tcp.transitory); + vlib_cli_output (vm, "icmp timeout: %dsec", timeouts.icmp); + return 0; +} + +static clib_error_t * +det44_plugin_enable_disable_command_fn (vlib_main_t * vm, + unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + u8 enable = 0, is_set = 0; + clib_error_t *error = 0; + det44_config_t c = { 0 }; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (!is_set && unformat (line_input, "enable")) + { + unformat (line_input, "inside vrf %u", &c.inside_vrf_id); + unformat (line_input, "outside vrf %u", &c.outside_vrf_id); + enable = 1; + } + else if (!is_set && unformat (line_input, "disable")); + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + is_set = 1; + } + + if (enable) + { + if (det44_plugin_enable (c)) + error = clib_error_return (0, "plugin enable failed"); + } + else + { + if (det44_plugin_disable ()) + error = clib_error_return (0, "plugin disable failed"); + } +done: + unformat_free (line_input); + return error; +} + +typedef struct +{ + u32 sw_if_index; + u8 is_inside; +} sw_if_indices_t; + +static clib_error_t * +det44_feature_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + unformat_input_t _line_input, *line_input = &_line_input; + sw_if_indices_t *sw_if_indices = 0, *p, e; + vnet_main_t *vnm = vnet_get_main (); + clib_error_t *error = 0; + u8 is_del = 0; + + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "inside %U", unformat_vnet_sw_interface, + vnm, &e.sw_if_index)) + { + e.is_inside = 1; + vec_add1 (sw_if_indices, e); + } + else if (unformat (line_input, "outside %U", unformat_vnet_sw_interface, + vnm, &e.sw_if_index)) + { + e.is_inside = 0; + vec_add1 (sw_if_indices, e); + } + else if (unformat (line_input, "del")) + is_del = 1; + else + { + error = clib_error_return (0, "unknown input '%U'", + format_unformat_error, line_input); + goto done; + } + } + + /* *INDENT-OFF* */ + vec_foreach (p, sw_if_indices) + { + if (det44_interface_add_del (p->sw_if_index, p->is_inside, is_del)) + { + error = clib_error_return (0, "%s %s %U failed", + is_del ? "del" : "add", + p->is_inside ? "inside" : "outside", + format_vnet_sw_if_index_name, + vnm, p->sw_if_index); + break; + } + } + /* *INDENT-ON* */ +done: + unformat_free (line_input); + vec_free (sw_if_indices); + return error; +} + +static clib_error_t * +det44_show_interfaces_command_fn (vlib_main_t * vm, unformat_input_t * input, + vlib_cli_command_t * cmd) +{ + vnet_main_t *vnm = vnet_get_main (); + det44_main_t *dm = &det44_main; + det44_interface_t *i; + vlib_cli_output (vm, "DET44 interfaces:"); + /* *INDENT-OFF* */ + pool_foreach (i, dm->interfaces, + ({ + vlib_cli_output (vm, " %U %s", format_vnet_sw_if_index_name, vnm, + i->sw_if_index, + (det44_interface_is_inside(i) && + det44_interface_is_outside(i)) ? "in out" : + (det44_interface_is_inside(i) ? "in" : "out")); + })); + /* *INDENT-ON* */ + return 0; +} + +/* *INDENT-OFF* */ +/*? + * @cliexpar + * @cliexstart{det44 add} + * Create bijective mapping of inside address to outside address and port range + * pairs, with the purpose of enabling DET44 to reduce logging in CGN + * deployments. + * To create mapping between inside network 10.0.0.0/18 and + * outside network 1.1.1.0/30 use: + * # vpp# det44 add in 10.0.0.0/18 out 1.1.1.0/30 + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_map_command, static) = { + .path = "det44 add", + .short_help = "det44 add in <addr>/<plen> out <addr>/<plen> [del]", + .function = det44_map_command_fn, +}; + +/*? + * @cliexpar + * @cliexpstart{show det44 mappings} + * Show DET44 mappings + * vpp# show det44 mappings + * DET44 mappings: + * in 10.0.0.0/24 out 1.1.1.1/32 + * outside address sharing ratio: 256 + * number of ports per inside host: 252 + * sessions number: 0 + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_show_mappings_command, static) = { + .path = "show det44 mappings", + .short_help = "show det44 mappings", + .function = det44_show_mappings_command_fn, +}; + +/*? + * @cliexpar + * @cliexstart{det44 forward} + * Return outside address and port range from inside address for DET44. + * To obtain outside address and port of inside host use: + * vpp# det44 forward 10.0.0.2 + * 1.1.1.0:<1054-1068> + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_forward_command, static) = { + .path = "det44 forward", + .short_help = "det44 forward <addr>", + .function = det44_forward_command_fn, +}; + +/*? + * @cliexpar + * @cliexstart{det44 reverse} + * Return inside address from outside address and port for DET44. + * To obtain inside host address from outside address and port use: + * #vpp det44 reverse 1.1.1.1:1276 + * 10.0.16.16 + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_reverse_command, static) = { + .path = "det44 reverse", + .short_help = "det44 reverse <addr>:<port>", + .function = det44_reverse_command_fn, +}; + +/*? + * @cliexpar + * @cliexstart{show det44 sessions} + * Show DET44 sessions. + * vpp# show det44 sessions + * DET44 sessions: + * in 10.0.0.3:3005 out 1.1.1.2:1146 external host 172.16.1.2:3006 state: udp-active expire: 306 + * in 10.0.0.3:3000 out 1.1.1.2:1141 external host 172.16.1.2:3001 state: udp-active expire: 306 + * in 10.0.0.4:3005 out 1.1.1.2:1177 external host 172.16.1.2:3006 state: udp-active expire: 306 + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_show_sessions_command, static) = { + .path = "show det44 sessions", + .short_help = "show det44 sessions", + .function = det44_show_sessions_command_fn, +}; + +/*? + * @cliexpar + * @cliexstart{det44 close session out} + * Close session using outside ip address and port + * and external ip address and port, use: + * vpp# det44 close session out 1.1.1.1:1276 2.2.2.2:2387 + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_close_sesion_out_command, static) = { + .path = "det44 close session out", + .short_help = "det44 close session out " + "<out_addr>:<out_port> <ext_addr>:<ext_port>", + .function = det44_close_session_out_fn, +}; + +/*? + * @cliexpar + * @cliexstart{det44 deterministic close session in} + * Close session using inside ip address and port + * and external ip address and port, use: + * vpp# det44 close session in 3.3.3.3:3487 2.2.2.2:2387 + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_close_session_in_command, static) = { + .path = "det44 close session in", + .short_help = "det44 close session in " + "<in_addr>:<in_port> <ext_addr>:<ext_port>", + .function = det44_close_session_in_fn, +}; +/* *INDENT-ON* */ + +/*? + * @cliexpar + * @cliexstart{set det44 timeout} + * Set values of timeouts for DET44 sessions (in seconds), use: + * vpp# set det44 timeouts udp 120 tcp established 7500 tcp transitory 250 icmp 90 + * To reset default values use: + * vpp# set det44 timeouts reset + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_set_timeouts_command, static) = +{ +.path = "set det44 timeouts",.short_help = + "set det44 timeouts <[udp <sec>] [tcp established <sec>] " + "[tcp transitory <sec>] [icmp <sec>]|reset>",.function = + det44_set_timeouts_command_fn,}; + +/*? + * @cliexpar + * @cliexstart{show det44 timeouts} + * Show values of timeouts for DET44 sessions. + * vpp# show det44 timeouts + * udp timeout: 300sec + * tcp-established timeout: 7440sec + * tcp-transitory timeout: 240sec + * icmp timeout: 60sec + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_show_timeouts_command, static) = +{ +.path = "show det44 timeouts",.short_help = + "show det44 timeouts",.function = det44_show_timeouts_command_fn,}; + +/*? + * @cliexpar + * @cliexstart{det44 plugin} + * Enable/disable DET44 plugin. + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_plugin_enable_disable_command, static) = +{ +.path = "det44 plugin",.short_help = + "det44 plugin <enable [inside vrf] [outside vrf]|disable>",.function = + det44_plugin_enable_disable_command_fn,}; + +/*? + * @cliexpar + * @cliexstart{set interface det44} + * Enable/disable DET44 feature on the interface. + * To enable DET44 feature with local network interface use: + * vpp# set interface det44 inside GigabitEthernet0/8/0 + * To enable DET44 feature with external network interface use: + * vpp# set interface det44 outside GigabitEthernet0/a/0 + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_feature_command, static) = +{ +.path = "set interface det44",.short_help = + "set interface det44 inside <intfc> outside <intfc> [del]",.function = + det44_feature_command_fn,}; + +/*? + * @cliexpar + * @cliexstart{show det44 interfaces} + * Show interfaces with DET44 feature. + * vpp# show det44 interfaces + * DET44 interfaces: + * GigabitEthernet0/8/0 in + * GigabitEthernet0/a/0 out + * @cliexend +?*/ +VLIB_CLI_COMMAND (det44_show_interfaces_command, static) = +{ +.path = "show det44 interfaces",.short_help = + "show det44 interfaces",.function = det44_show_interfaces_command_fn,}; + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/nat/det44/det44_in2out.c b/src/plugins/nat/det44/det44_in2out.c new file mode 100644 index 00000000000..3ed1cc77ff6 --- /dev/null +++ b/src/plugins/nat/det44/det44_in2out.c @@ -0,0 +1,1067 @@ +/* + * Copyright (c) 2020 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief Deterministic NAT (CGN) inside to outside translation + */ + +#include <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/fib/ip4_fib.h> +#include <vppinfra/error.h> +#include <vppinfra/elog.h> + +#include <nat/det44/det44.h> +#include <nat/det44/det44_inlines.h> + +#include <nat/lib/lib.h> +#include <nat/lib/inlines.h> +#include <nat/lib/nat_inlines.h> + +typedef enum +{ + DET44_IN2OUT_NEXT_LOOKUP, + DET44_IN2OUT_NEXT_DROP, + DET44_IN2OUT_NEXT_ICMP_ERROR, + DET44_IN2OUT_N_NEXT, +} det44_in2out_next_t; + +typedef struct +{ + u32 sw_if_index; + u32 next_index; + u32 session_index; +} det44_in2out_trace_t; + +#define foreach_det44_in2out_error \ +_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ +_(NO_TRANSLATION, "No translation") \ +_(BAD_ICMP_TYPE, "unsupported ICMP type") \ +_(OUT_OF_PORTS, "Out of ports") \ +_(IN2OUT_PACKETS, "Good in2out packets processed") + +typedef enum +{ +#define _(sym,str) DET44_IN2OUT_ERROR_##sym, + foreach_det44_in2out_error +#undef _ + DET44_IN2OUT_N_ERROR, +} det44_in2out_error_t; + +static char *det44_in2out_error_strings[] = { +#define _(sym,string) string, + foreach_det44_in2out_error +#undef _ +}; + +static u8 * +format_det44_in2out_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + det44_in2out_trace_t *t = va_arg (*args, det44_in2out_trace_t *); + + s = format (s, "DET44_IN2OUT: sw_if_index %d, next index %d, session %d", + t->sw_if_index, t->next_index, t->session_index); + + return s; +} + +#ifndef CLIB_MARCH_VARIANT +/** + * Get address and port values to be used for ICMP packet translation + * and create session if needed + * + * @param[in,out] node NAT node runtime + * @param[in] thread_index thread index + * @param[in,out] b0 buffer containing packet to be translated + * @param[in,out] ip0 ip header + * @param[out] p_proto protocol used for matching + * @param[out] p_value address and port after NAT translation + * @param[out] p_dont_translate if packet should not be translated + * @param d optional parameter + * @param e optional parameter + */ +u32 +icmp_match_in2out_det (vlib_node_runtime_t * node, + u32 thread_index, vlib_buffer_t * b0, + ip4_header_t * ip0, ip4_address_t * addr, + u16 * port, u32 * fib_index, + nat_protocol_t * proto, void *d, void *e, + u8 * dont_translate) +{ + det44_main_t *dm = &det44_main; + vlib_main_t *vm = vlib_get_main (); + icmp46_header_t *icmp0; + u32 sw_if_index0; + u32 rx_fib_index0; + nat_protocol_t protocol; + snat_det_out_key_t key0; + u32 next0 = ~0; + icmp_echo_header_t *echo0, *inner_echo0 = 0; + ip4_header_t *inner_ip0; + void *l4_header = 0; + icmp46_header_t *inner_icmp0; + snat_det_map_t *mp0 = 0; + ip4_address_t new_addr0; + u16 lo_port0, i0; + snat_det_session_t *ses0 = 0; + ip4_address_t in_addr; + u16 in_port; + *dont_translate = 0; + + icmp0 = (icmp46_header_t *) ip4_next_header (ip0); + echo0 = (icmp_echo_header_t *) (icmp0 + 1); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); + + if (!icmp_type_is_error_message + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)) + { + protocol = NAT_PROTOCOL_ICMP; + in_addr = ip0->src_address; + in_port = vnet_buffer (b0)->ip.reass.l4_src_port; + } + else + { + /* if error message, then it's not fragmented and we can access it */ + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); + protocol = ip_proto_to_nat_proto (inner_ip0->protocol); + in_addr = inner_ip0->dst_address; + switch (protocol) + { + case NAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + in_port = inner_echo0->identifier; + break; + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + in_port = ((tcp_udp_header_t *) l4_header)->dst_port; + break; + default: + b0->error = node->errors[DET44_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; + next0 = DET44_IN2OUT_NEXT_DROP; + goto out; + } + } + + mp0 = snat_det_map_by_user (&in_addr); + if (PREDICT_FALSE (!mp0)) + { + if (PREDICT_FALSE (det44_translate (node, sw_if_index0, ip0, + IP_PROTOCOL_ICMP, rx_fib_index0))) + { + *dont_translate = 1; + goto out; + } + next0 = DET44_IN2OUT_NEXT_DROP; + b0->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION]; + goto out; + } + + snat_det_forward (mp0, &in_addr, &new_addr0, &lo_port0); + + key0.ext_host_addr = ip0->dst_address; + key0.ext_host_port = 0; + + ses0 = snat_det_find_ses_by_in (mp0, &in_addr, in_port, key0); + if (PREDICT_FALSE (!ses0)) + { + if (PREDICT_FALSE (det44_translate (node, sw_if_index0, ip0, + IP_PROTOCOL_ICMP, rx_fib_index0))) + { + *dont_translate = 1; + goto out; + } + if (icmp0->type != ICMP4_echo_request) + { + b0->error = node->errors[DET44_IN2OUT_ERROR_BAD_ICMP_TYPE]; + next0 = DET44_IN2OUT_NEXT_DROP; + goto out; + } + for (i0 = 0; i0 < mp0->ports_per_host; i0++) + { + key0.out_port = clib_host_to_net_u16 (lo_port0 + + ((i0 + + clib_net_to_host_u16 + (echo0->identifier)) % + mp0->ports_per_host)); + + if (snat_det_get_ses_by_out (mp0, &in_addr, key0.as_u64)) + continue; + + ses0 = + snat_det_ses_create (thread_index, mp0, + &in_addr, echo0->identifier, &key0); + break; + } + if (PREDICT_FALSE (!ses0)) + { + next0 = DET44_IN2OUT_NEXT_DROP; + b0->error = node->errors[DET44_IN2OUT_ERROR_OUT_OF_PORTS]; + goto out; + } + } + + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request + && !icmp_type_is_error_message (vnet_buffer (b0)->ip. + reass.icmp_type_or_tcp_flags))) + { + b0->error = node->errors[DET44_IN2OUT_ERROR_BAD_ICMP_TYPE]; + next0 = DET44_IN2OUT_NEXT_DROP; + goto out; + } + + u32 now = (u32) vlib_time_now (vm); + + ses0->state = DET44_SESSION_ICMP_ACTIVE; + ses0->expire = now + dm->timeouts.icmp; + +out: + *proto = protocol; + if (ses0) + { + *addr = new_addr0; + *fib_index = dm->outside_fib_index; + *port = ses0->out.out_port; + } + if (d) + *(snat_det_session_t **) d = ses0; + if (e) + *(snat_det_map_t **) e = mp0; + return next0; +} +#endif + +#ifndef CLIB_MARCH_VARIANT +u32 +det44_icmp_in2out (vlib_buffer_t * b0, + ip4_header_t * ip0, + icmp46_header_t * icmp0, + u32 sw_if_index0, + u32 rx_fib_index0, + vlib_node_runtime_t * node, + u32 next0, u32 thread_index, void *d, void *e) +{ + vlib_main_t *vm = vlib_get_main (); + u16 old_id0, new_id0, port, checksum0, old_checksum0, new_checksum0; + u32 new_addr0, old_addr0, next0_tmp, fib_index; + icmp_echo_header_t *echo0, *inner_echo0; + icmp46_header_t *inner_icmp0; + ip4_header_t *inner_ip0; + ip4_address_t addr; + void *l4_header; + u8 dont_translate; + ip_csum_t sum0; + nat_protocol_t protocol; + + echo0 = (icmp_echo_header_t *) (icmp0 + 1); + next0_tmp = icmp_match_in2out_det (node, thread_index, b0, ip0, + &addr, &port, &fib_index, &protocol, + d, e, &dont_translate); + if (next0_tmp != ~0) + next0 = next0_tmp; + if (next0 == DET44_IN2OUT_NEXT_DROP || dont_translate) + goto out; + + if (PREDICT_TRUE (!ip4_is_fragment (ip0))) + { + sum0 = + ip_incremental_checksum_buffer (vm, b0, + (u8 *) icmp0 - + (u8 *) vlib_buffer_get_current (b0), + ntohs (ip0->length) - + ip4_header_bytes (ip0), 0); + checksum0 = ~ip_csum_fold (sum0); + if (PREDICT_FALSE (checksum0 != 0 && checksum0 != 0xffff)) + { + next0 = DET44_IN2OUT_NEXT_DROP; + goto out; + } + } + + old_addr0 = ip0->src_address.as_u32; + new_addr0 = ip0->src_address.as_u32 = addr.as_u32; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + src_address /* changed member */ ); + ip0->checksum = ip_csum_fold (sum0); + + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + if (icmp0->checksum == 0) + icmp0->checksum = 0xffff; + + if (!icmp_type_is_error_message (icmp0->type)) + { + new_id0 = port; + if (PREDICT_FALSE (new_id0 != echo0->identifier)) + { + old_id0 = echo0->identifier; + new_id0 = port; + echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier); + icmp0->checksum = ip_csum_fold (sum0); + } + } + else + { + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); + + if (!ip4_header_checksum_is_valid (inner_ip0)) + { + next0 = DET44_IN2OUT_NEXT_DROP; + goto out; + } + + /* update inner destination IP address */ + old_addr0 = inner_ip0->dst_address.as_u32; + inner_ip0->dst_address = addr; + new_addr0 = inner_ip0->dst_address.as_u32; + sum0 = icmp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + dst_address /* changed member */ ); + icmp0->checksum = ip_csum_fold (sum0); + + /* update inner IP header checksum */ + old_checksum0 = inner_ip0->checksum; + sum0 = inner_ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + dst_address /* changed member */ ); + inner_ip0->checksum = ip_csum_fold (sum0); + new_checksum0 = inner_ip0->checksum; + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t, + checksum); + icmp0->checksum = ip_csum_fold (sum0); + + switch (protocol) + { + case NAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + + old_id0 = inner_echo0->identifier; + new_id0 = port; + inner_echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier); + icmp0->checksum = ip_csum_fold (sum0); + break; + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port; + new_id0 = port; + ((tcp_udp_header_t *) l4_header)->dst_port = new_id0; + + sum0 = icmp0->checksum; + sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t, + dst_port); + icmp0->checksum = ip_csum_fold (sum0); + break; + default: + ASSERT (0); + } + } + } + + if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0) + vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index; +out: + return next0; +} +#endif + +VLIB_NODE_FN (det44_in2out_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + det44_in2out_next_t next_index; + u32 pkts_processed = 0; + det44_main_t *dm = &det44_main; + u32 now = (u32) vlib_time_now (vm); + u32 thread_index = vm->thread_index; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t *b0, *b1; + u32 next0, next1; + u32 sw_if_index0, sw_if_index1; + ip4_header_t *ip0, *ip1; + ip_csum_t sum0, sum1; + ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1; + u16 old_port0, new_port0, lo_port0, i0; + u16 old_port1, new_port1, lo_port1, i1; + udp_header_t *udp0, *udp1; + tcp_header_t *tcp0, *tcp1; + u32 proto0, proto1; + snat_det_out_key_t key0, key1; + snat_det_map_t *mp0, *mp1; + snat_det_session_t *ses0 = 0, *ses1 = 0; + u32 rx_fib_index0, rx_fib_index1; + icmp46_header_t *icmp0, *icmp1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t *p2, *p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD); + } + + /* speculatively enqueue b0 and b1 to the current next frame */ + to_next[0] = bi0 = from[0]; + to_next[1] = bi1 = from[1]; + from += 2; + to_next += 2; + n_left_from -= 2; + n_left_to_next -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + next0 = DET44_IN2OUT_NEXT_LOOKUP; + next1 = DET44_IN2OUT_NEXT_LOOKUP; + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + if (PREDICT_FALSE (ip0->ttl == 1)) + { + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded, + ICMP4_time_exceeded_ttl_exceeded_in_transit, + 0); + next0 = DET44_IN2OUT_NEXT_ICMP_ERROR; + goto trace0; + } + + proto0 = ip_proto_to_nat_proto (ip0->protocol); + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) + { + rx_fib_index0 = + ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); + icmp0 = (icmp46_header_t *) udp0; + + // TODO: + next0 = det44_icmp_in2out (b0, ip0, icmp0, sw_if_index0, + rx_fib_index0, node, next0, + thread_index, &ses0, &mp0); + goto trace0; + } + + mp0 = snat_det_map_by_user (&ip0->src_address); + if (PREDICT_FALSE (!mp0)) + { + det44_log_info ("no match for internal host %U", + format_ip4_address, &ip0->src_address); + next0 = DET44_IN2OUT_NEXT_DROP; + b0->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION]; + goto trace0; + } + + snat_det_forward (mp0, &ip0->src_address, &new_addr0, &lo_port0); + + key0.ext_host_addr = ip0->dst_address; + key0.ext_host_port = tcp0->dst; + + ses0 = + snat_det_find_ses_by_in (mp0, &ip0->src_address, tcp0->src, key0); + if (PREDICT_FALSE (!ses0)) + { + for (i0 = 0; i0 < mp0->ports_per_host; i0++) + { + key0.out_port = clib_host_to_net_u16 (lo_port0 + + ((i0 + + clib_net_to_host_u16 + (tcp0->src)) % + mp0-> + ports_per_host)); + + if (snat_det_get_ses_by_out + (mp0, &ip0->src_address, key0.as_u64)) + continue; + + ses0 = + snat_det_ses_create (thread_index, mp0, &ip0->src_address, + tcp0->src, &key0); + break; + } + if (PREDICT_FALSE (!ses0)) + { + /* too many sessions for user, send ICMP error packet */ + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, + ICMP4_destination_unreachable, + ICMP4_destination_unreachable_destination_unreachable_host, + 0); + next0 = DET44_IN2OUT_NEXT_ICMP_ERROR; + goto trace0; + } + } + + old_port0 = udp0->src_port; + udp0->src_port = new_port0 = ses0->out.out_port; + + old_addr0.as_u32 = ip0->src_address.as_u32; + ip0->src_address.as_u32 = new_addr0.as_u32; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->outside_fib_index; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + src_address /* changed member */ ); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + if (tcp0->flags & TCP_FLAG_SYN) + ses0->state = DET44_SESSION_TCP_SYN_SENT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_SYN_SENT) + ses0->state = DET44_SESSION_TCP_ESTABLISHED; + else if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_ESTABLISHED) + ses0->state = DET44_SESSION_TCP_FIN_WAIT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_FIN_WAIT) + snat_det_ses_close (mp0, ses0); + else if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_CLOSE_WAIT) + ses0->state = DET44_SESSION_TCP_LAST_ACK; + else if (tcp0->flags == 0 + && ses0->state == DET44_SESSION_UNKNOWN) + ses0->state = DET44_SESSION_TCP_ESTABLISHED; + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + mss_clamping (dm->mss_clamping, tcp0, &sum0); + tcp0->checksum = ip_csum_fold (sum0); + } + else + { + ses0->state = DET44_SESSION_UDP_ACTIVE; + + if (PREDICT_FALSE (udp0->checksum)) + { + sum0 = udp0->checksum; + sum0 = + ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = + ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp0->checksum = ip_csum_fold (sum0); + } + } + + switch (ses0->state) + { + case DET44_SESSION_UDP_ACTIVE: + ses0->expire = now + dm->timeouts.udp; + break; + case DET44_SESSION_TCP_SYN_SENT: + case DET44_SESSION_TCP_FIN_WAIT: + case DET44_SESSION_TCP_CLOSE_WAIT: + case DET44_SESSION_TCP_LAST_ACK: + ses0->expire = now + dm->timeouts.tcp.transitory; + break; + case DET44_SESSION_TCP_ESTABLISHED: + ses0->expire = now + dm->timeouts.tcp.established; + break; + } + + trace0: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_in2out_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + t->next_index = next0; + t->session_index = ~0; + if (ses0) + t->session_index = ses0 - mp0->sessions; + } + + pkts_processed += next0 != DET44_IN2OUT_NEXT_DROP; + + ip1 = vlib_buffer_get_current (b1); + udp1 = ip4_next_header (ip1); + tcp1 = (tcp_header_t *) udp1; + + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + + if (PREDICT_FALSE (ip1->ttl == 1)) + { + vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded, + ICMP4_time_exceeded_ttl_exceeded_in_transit, + 0); + next1 = DET44_IN2OUT_NEXT_ICMP_ERROR; + goto trace1; + } + + proto1 = ip_proto_to_nat_proto (ip1->protocol); + + if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) + { + rx_fib_index1 = + ip4_fib_table_get_index_for_sw_if_index (sw_if_index1); + icmp1 = (icmp46_header_t *) udp1; + + next1 = det44_icmp_in2out (b1, ip1, icmp1, sw_if_index1, + rx_fib_index1, node, next1, + thread_index, &ses1, &mp1); + goto trace1; + } + + mp1 = snat_det_map_by_user (&ip1->src_address); + if (PREDICT_FALSE (!mp1)) + { + det44_log_info ("no match for internal host %U", + format_ip4_address, &ip0->src_address); + next1 = DET44_IN2OUT_NEXT_DROP; + b1->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION]; + goto trace1; + } + + snat_det_forward (mp1, &ip1->src_address, &new_addr1, &lo_port1); + + key1.ext_host_addr = ip1->dst_address; + key1.ext_host_port = tcp1->dst; + + ses1 = + snat_det_find_ses_by_in (mp1, &ip1->src_address, tcp1->src, key1); + if (PREDICT_FALSE (!ses1)) + { + for (i1 = 0; i1 < mp1->ports_per_host; i1++) + { + key1.out_port = clib_host_to_net_u16 (lo_port1 + + ((i1 + + clib_net_to_host_u16 + (tcp1->src)) % + mp1-> + ports_per_host)); + + if (snat_det_get_ses_by_out + (mp1, &ip1->src_address, key1.as_u64)) + continue; + + ses1 = + snat_det_ses_create (thread_index, mp1, &ip1->src_address, + tcp1->src, &key1); + break; + } + if (PREDICT_FALSE (!ses1)) + { + /* too many sessions for user, send ICMP error packet */ + vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b1, + ICMP4_destination_unreachable, + ICMP4_destination_unreachable_destination_unreachable_host, + 0); + next1 = DET44_IN2OUT_NEXT_ICMP_ERROR; + goto trace1; + } + } + + old_port1 = udp1->src_port; + udp1->src_port = new_port1 = ses1->out.out_port; + + old_addr1.as_u32 = ip1->src_address.as_u32; + ip1->src_address.as_u32 = new_addr1.as_u32; + vnet_buffer (b1)->sw_if_index[VLIB_TX] = dm->outside_fib_index; + + sum1 = ip1->checksum; + sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, + ip4_header_t, + src_address /* changed member */ ); + ip1->checksum = ip_csum_fold (sum1); + + if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP)) + { + if (tcp1->flags & TCP_FLAG_SYN) + ses1->state = DET44_SESSION_TCP_SYN_SENT; + else if (tcp1->flags & TCP_FLAG_ACK + && ses1->state == DET44_SESSION_TCP_SYN_SENT) + ses1->state = DET44_SESSION_TCP_ESTABLISHED; + else if (tcp1->flags & TCP_FLAG_FIN + && ses1->state == DET44_SESSION_TCP_ESTABLISHED) + ses1->state = DET44_SESSION_TCP_FIN_WAIT; + else if (tcp1->flags & TCP_FLAG_ACK + && ses1->state == DET44_SESSION_TCP_FIN_WAIT) + snat_det_ses_close (mp1, ses1); + else if (tcp1->flags & TCP_FLAG_FIN + && ses1->state == DET44_SESSION_TCP_CLOSE_WAIT) + ses1->state = DET44_SESSION_TCP_LAST_ACK; + else if (tcp1->flags == 0 + && ses1->state == DET44_SESSION_UNKNOWN) + ses1->state = DET44_SESSION_TCP_ESTABLISHED; + + sum1 = tcp1->checksum; + sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum1 = ip_csum_update (sum1, old_port1, new_port1, + ip4_header_t /* cheat */ , + length /* changed member */ ); + mss_clamping (dm->mss_clamping, tcp1, &sum1); + tcp1->checksum = ip_csum_fold (sum1); + } + else + { + ses1->state = DET44_SESSION_UDP_ACTIVE; + + if (PREDICT_FALSE (udp1->checksum)) + { + sum1 = udp1->checksum; + sum1 = + ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum1 = + ip_csum_update (sum1, old_port1, new_port1, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp1->checksum = ip_csum_fold (sum1); + } + } + + switch (ses1->state) + { + case DET44_SESSION_UDP_ACTIVE: + ses1->expire = now + dm->timeouts.udp; + break; + case DET44_SESSION_TCP_SYN_SENT: + case DET44_SESSION_TCP_FIN_WAIT: + case DET44_SESSION_TCP_CLOSE_WAIT: + case DET44_SESSION_TCP_LAST_ACK: + ses1->expire = now + dm->timeouts.tcp.transitory; + break; + case DET44_SESSION_TCP_ESTABLISHED: + ses1->expire = now + dm->timeouts.tcp.established; + break; + } + + trace1: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b1->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_in2out_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->sw_if_index = sw_if_index1; + t->next_index = next1; + t->session_index = ~0; + if (ses1) + t->session_index = ses1 - mp1->sessions; + } + + pkts_processed += next1 != DET44_IN2OUT_NEXT_DROP; + + /* verify speculative enqueues, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + u32 next0; + u32 sw_if_index0; + ip4_header_t *ip0; + ip_csum_t sum0; + ip4_address_t new_addr0, old_addr0; + u16 old_port0, new_port0, lo_port0, i0; + udp_header_t *udp0; + tcp_header_t *tcp0; + u32 proto0; + snat_det_out_key_t key0; + snat_det_map_t *mp0; + snat_det_session_t *ses0 = 0; + u32 rx_fib_index0; + icmp46_header_t *icmp0; + + /* speculatively enqueue b0 to the current next frame */ + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + next0 = DET44_IN2OUT_NEXT_LOOKUP; + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + if (PREDICT_FALSE (ip0->ttl == 1)) + { + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded, + ICMP4_time_exceeded_ttl_exceeded_in_transit, + 0); + next0 = DET44_IN2OUT_NEXT_ICMP_ERROR; + goto trace00; + } + + proto0 = ip_proto_to_nat_proto (ip0->protocol); + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) + { + rx_fib_index0 = + ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); + icmp0 = (icmp46_header_t *) udp0; + + next0 = det44_icmp_in2out (b0, ip0, icmp0, sw_if_index0, + rx_fib_index0, node, next0, + thread_index, &ses0, &mp0); + goto trace00; + } + + mp0 = snat_det_map_by_user (&ip0->src_address); + if (PREDICT_FALSE (!mp0)) + { + det44_log_info ("no match for internal host %U", + format_ip4_address, &ip0->src_address); + next0 = DET44_IN2OUT_NEXT_DROP; + b0->error = node->errors[DET44_IN2OUT_ERROR_NO_TRANSLATION]; + goto trace00; + } + + snat_det_forward (mp0, &ip0->src_address, &new_addr0, &lo_port0); + + key0.ext_host_addr = ip0->dst_address; + key0.ext_host_port = tcp0->dst; + + ses0 = + snat_det_find_ses_by_in (mp0, &ip0->src_address, tcp0->src, key0); + if (PREDICT_FALSE (!ses0)) + { + for (i0 = 0; i0 < mp0->ports_per_host; i0++) + { + key0.out_port = clib_host_to_net_u16 (lo_port0 + + ((i0 + + clib_net_to_host_u16 + (tcp0->src)) % + mp0-> + ports_per_host)); + + if (snat_det_get_ses_by_out + (mp0, &ip0->src_address, key0.as_u64)) + continue; + + ses0 = + snat_det_ses_create (thread_index, mp0, &ip0->src_address, + tcp0->src, &key0); + break; + } + if (PREDICT_FALSE (!ses0)) + { + /* too many sessions for user, send ICMP error packet */ + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, + ICMP4_destination_unreachable, + ICMP4_destination_unreachable_destination_unreachable_host, + 0); + next0 = DET44_IN2OUT_NEXT_ICMP_ERROR; + goto trace00; + } + } + + old_port0 = udp0->src_port; + udp0->src_port = new_port0 = ses0->out.out_port; + + old_addr0.as_u32 = ip0->src_address.as_u32; + ip0->src_address.as_u32 = new_addr0.as_u32; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->outside_fib_index; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + src_address /* changed member */ ); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + if (tcp0->flags & TCP_FLAG_SYN) + ses0->state = DET44_SESSION_TCP_SYN_SENT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_SYN_SENT) + ses0->state = DET44_SESSION_TCP_ESTABLISHED; + else if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_ESTABLISHED) + ses0->state = DET44_SESSION_TCP_FIN_WAIT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_FIN_WAIT) + snat_det_ses_close (mp0, ses0); + else if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_CLOSE_WAIT) + ses0->state = DET44_SESSION_TCP_LAST_ACK; + else if (tcp0->flags == 0 + && ses0->state == DET44_SESSION_UNKNOWN) + ses0->state = DET44_SESSION_TCP_ESTABLISHED; + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + mss_clamping (dm->mss_clamping, tcp0, &sum0); + tcp0->checksum = ip_csum_fold (sum0); + } + else + { + ses0->state = DET44_SESSION_UDP_ACTIVE; + + if (PREDICT_FALSE (udp0->checksum)) + { + sum0 = udp0->checksum; + sum0 = + ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = + ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp0->checksum = ip_csum_fold (sum0); + } + } + + switch (ses0->state) + { + case DET44_SESSION_UDP_ACTIVE: + ses0->expire = now + dm->timeouts.udp; + break; + case DET44_SESSION_TCP_SYN_SENT: + case DET44_SESSION_TCP_FIN_WAIT: + case DET44_SESSION_TCP_CLOSE_WAIT: + case DET44_SESSION_TCP_LAST_ACK: + ses0->expire = now + dm->timeouts.tcp.transitory; + break; + case DET44_SESSION_TCP_ESTABLISHED: + ses0->expire = now + dm->timeouts.tcp.established; + break; + } + + trace00: + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_in2out_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + t->next_index = next0; + t->session_index = ~0; + if (ses0) + t->session_index = ses0 - mp0->sessions; + } + + pkts_processed += next0 != DET44_IN2OUT_NEXT_DROP; + + /* verify speculative enqueue, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + vlib_node_increment_counter (vm, dm->in2out_node_index, + DET44_IN2OUT_ERROR_IN2OUT_PACKETS, + pkts_processed); + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (det44_in2out_node) = { + .name = "det44-in2out", + .vector_size = sizeof (u32), + .format_trace = format_det44_in2out_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN(det44_in2out_error_strings), + .error_strings = det44_in2out_error_strings, + .runtime_data_bytes = sizeof (det44_runtime_t), + .n_next_nodes = DET44_IN2OUT_N_NEXT, + /* edit / add dispositions here */ + .next_nodes = { + [DET44_IN2OUT_NEXT_DROP] = "error-drop", + [DET44_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", + [DET44_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/nat/det44/det44_inlines.h b/src/plugins/nat/det44/det44_inlines.h new file mode 100644 index 00000000000..e4be469562c --- /dev/null +++ b/src/plugins/nat/det44/det44_inlines.h @@ -0,0 +1,130 @@ +/* + * det44.h - deterministic NAT definitions + * + * Copyright (c) 2020 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief Deterministic NAT (CGN) inlines + */ + +#ifndef __included_det44_inlines_h__ +#define __included_det44_inlines_h__ + +static_always_inline int +det44_is_interface_addr (vlib_node_runtime_t * node, + u32 sw_if_index0, u32 ip4_addr) +{ + det44_runtime_t *rt = (det44_runtime_t *) node->runtime_data; + det44_main_t *dm = &det44_main; + ip4_address_t *first_int_addr; + + if (PREDICT_FALSE (rt->cached_sw_if_index != sw_if_index0)) + { + first_int_addr = ip4_interface_first_address (dm->ip4_main, + sw_if_index0, 0); + rt->cached_sw_if_index = sw_if_index0; + if (first_int_addr) + rt->cached_ip4_address = first_int_addr->as_u32; + else + rt->cached_ip4_address = 0; + } + if (PREDICT_FALSE (rt->cached_ip4_address == ip4_addr)) + return 0; + return 1; +} + +/** + * @brief Check if packet should be translated + * + * Packets aimed at outside interface and external address with active session + * should be translated. + * + * @param node NAT runtime data + * @param sw_if_index0 index of the inside interface + * @param ip0 IPv4 header + * @param proto0 NAT protocol + * @param rx_fib_index0 RX FIB index + * + * @returns 0 if packet should be translated otherwise 1 + */ +static_always_inline int +det44_translate (vlib_node_runtime_t * node, u32 sw_if_index0, + ip4_header_t * ip0, u32 proto0, u32 rx_fib_index0) +{ + det44_main_t *dm = &det44_main; + fib_node_index_t fei = FIB_NODE_INDEX_INVALID; + det44_fib_t *outside_fib; + fib_prefix_t pfx = { + .fp_proto = FIB_PROTOCOL_IP4, + .fp_len = 32, + .fp_addr = { + .ip4.as_u32 = ip0->dst_address.as_u32, + } + , + }; + + /* Don't NAT packet aimed at the interface address */ + if (PREDICT_FALSE (!det44_is_interface_addr (node, sw_if_index0, + ip0->dst_address.as_u32))) + { + return 1; + } + + /* find out if there is outside feature enabled for this destination */ + fei = fib_table_lookup (rx_fib_index0, &pfx); + if (FIB_NODE_INDEX_INVALID != fei) + { + u32 sw_if_index = fib_entry_get_resolving_interface (fei); + if (sw_if_index == ~0) + { + // TODO: go over use cases + /* *INDENT-OFF* */ + vec_foreach (outside_fib, dm->outside_fibs) + { + fei = fib_table_lookup (outside_fib->fib_index, &pfx); + if (FIB_NODE_INDEX_INVALID != fei) + { + sw_if_index = fib_entry_get_resolving_interface (fei); + if (sw_if_index != ~0) + break; + } + } + /* *INDENT-ON* */ + } + if (sw_if_index != ~0) + { + det44_interface_t *i; + /* *INDENT-OFF* */ + pool_foreach (i, dm->interfaces, ({ + /* NAT packet aimed at outside interface */ + if ((det44_interface_is_outside (i)) && (sw_if_index == i->sw_if_index)) + return 0; + })); + /* *INDENT-ON* */ + } + } + return 1; +} + +#endif /* __included_det44_inlines_h__ */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ diff --git a/src/plugins/nat/det44/det44_out2in.c b/src/plugins/nat/det44/det44_out2in.c new file mode 100644 index 00000000000..5ee28777b84 --- /dev/null +++ b/src/plugins/nat/det44/det44_out2in.c @@ -0,0 +1,866 @@ +/* + * Copyright (c) 2020 Cisco and/or its affiliates. + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file + * @brief Deterministic NAT (CGN) outside to inside translation + */ + +#include <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/fib/ip4_fib.h> +#include <vppinfra/error.h> +#include <vppinfra/elog.h> + +#include <nat/det44/det44.h> +#include <nat/det44/det44_inlines.h> + +#include <nat/lib/lib.h> +#include <nat/lib/inlines.h> +#include <nat/lib/nat_inlines.h> + +typedef enum +{ + DET44_OUT2IN_NEXT_DROP, + DET44_OUT2IN_NEXT_LOOKUP, + DET44_OUT2IN_NEXT_ICMP_ERROR, + DET44_OUT2IN_N_NEXT, +} det44_out2in_next_t; + +typedef struct +{ + u32 sw_if_index; + u32 next_index; + u32 session_index; +} det44_out2in_trace_t; + +#define foreach_det44_out2in_error \ +_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ +_(NO_TRANSLATION, "No translation") \ +_(BAD_ICMP_TYPE, "unsupported ICMP type") \ +_(OUT2IN_PACKETS, "Good out2in packets processed") + +typedef enum +{ +#define _(sym,str) DET44_OUT2IN_ERROR_##sym, + foreach_det44_out2in_error +#undef _ + DET44_OUT2IN_N_ERROR, +} det44_out2in_error_t; + +static char *det44_out2in_error_strings[] = { +#define _(sym,string) string, + foreach_det44_out2in_error +#undef _ +}; + +static u8 * +format_det44_out2in_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + det44_out2in_trace_t *t = va_arg (*args, det44_out2in_trace_t *); + + s = + format (s, + "DET44_OUT2IN: sw_if_index %d, next index %d, session index %d", + t->sw_if_index, t->next_index, t->session_index); + return s; +} + +#ifndef CLIB_MARCH_VARIANT +/** + * Get address and port values to be used for ICMP packet translation + * and create session if needed + * + * @param[in,out] node NAT node runtime + * @param[in] thread_index thread index + * @param[in,out] b0 buffer containing packet to be translated + * @param[in,out] ip0 ip header + * @param[out] p_proto protocol used for matching + * @param[out] p_value address and port after NAT translation + * @param[out] p_dont_translate if packet should not be translated + * @param d optional parameter + * @param e optional parameter + */ +u32 +icmp_match_out2in_det (vlib_node_runtime_t * node, + u32 thread_index, vlib_buffer_t * b0, + ip4_header_t * ip0, ip4_address_t * addr, + u16 * port, u32 * fib_index, + nat_protocol_t * proto, void *d, void *e, + u8 * dont_translate) +{ + det44_main_t *dm = &det44_main; + icmp46_header_t *icmp0; + u32 sw_if_index0; + u8 protocol; + snat_det_out_key_t key0; + u32 next0 = ~0; + icmp_echo_header_t *echo0, *inner_echo0 = 0; + ip4_header_t *inner_ip0; + void *l4_header = 0; + icmp46_header_t *inner_icmp0; + snat_det_map_t *mp0 = 0; + ip4_address_t new_addr0 = { {0} }; + snat_det_session_t *ses0 = 0; + ip4_address_t out_addr; + *dont_translate = 0; + + icmp0 = (icmp46_header_t *) ip4_next_header (ip0); + echo0 = (icmp_echo_header_t *) (icmp0 + 1); + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + if (!icmp_type_is_error_message + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)) + { + protocol = NAT_PROTOCOL_ICMP; + key0.ext_host_addr = ip0->src_address; + key0.ext_host_port = 0; + key0.out_port = vnet_buffer (b0)->ip.reass.l4_src_port; + out_addr = ip0->dst_address; + } + else + { + /* if error message, then it's not fragmented and we can access it */ + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); + protocol = ip_proto_to_nat_proto (inner_ip0->protocol); + key0.ext_host_addr = inner_ip0->dst_address; + out_addr = inner_ip0->src_address; + switch (protocol) + { + case NAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + key0.ext_host_port = 0; + key0.out_port = inner_echo0->identifier; + break; + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + key0.ext_host_port = ((tcp_udp_header_t *) l4_header)->dst_port; + key0.out_port = ((tcp_udp_header_t *) l4_header)->src_port; + break; + default: + b0->error = node->errors[DET44_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + } + + mp0 = snat_det_map_by_out (&out_addr); + if (PREDICT_FALSE (!mp0)) + { + /* Don't NAT packet aimed at the intfc address */ + if (PREDICT_FALSE (!det44_is_interface_addr (node, sw_if_index0, + ip0->dst_address.as_u32))) + { + *dont_translate = 1; + goto out; + } + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip0->dst_address); + goto out; + } + + snat_det_reverse (mp0, &ip0->dst_address, + clib_net_to_host_u16 (key0.out_port), &new_addr0); + + ses0 = snat_det_get_ses_by_out (mp0, &new_addr0, key0.as_u64); + if (PREDICT_FALSE (!ses0)) + { + /* Don't NAT packet aimed at the intfc address */ + if (PREDICT_FALSE (!det44_is_interface_addr (node, sw_if_index0, + ip0->dst_address.as_u32))) + { + *dont_translate = 1; + goto out; + } + det44_log_info ("no match src %U:%d dst %U:%d for user %U", + format_ip4_address, &key0.ext_host_addr, + clib_net_to_host_u16 (key0.ext_host_port), + format_ip4_address, &out_addr, + clib_net_to_host_u16 (key0.out_port), + format_ip4_address, &new_addr0); + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply + && !icmp_type_is_error_message (vnet_buffer (b0)->ip. + reass.icmp_type_or_tcp_flags))) + { + b0->error = node->errors[DET44_OUT2IN_ERROR_BAD_ICMP_TYPE]; + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + + goto out; + +out: + *proto = protocol; + if (ses0) + { + *addr = new_addr0; + *fib_index = dm->inside_fib_index; + *port = ses0->in_port; + } + if (d) + *(snat_det_session_t **) d = ses0; + if (e) + *(snat_det_map_t **) e = mp0; + return next0; +} +#endif + +#ifndef CLIB_MARCH_VARIANT +u32 +det44_icmp_out2in (vlib_buffer_t * b0, + ip4_header_t * ip0, + icmp46_header_t * icmp0, + u32 sw_if_index0, + u32 rx_fib_index0, + vlib_node_runtime_t * node, + u32 next0, u32 thread_index, void *d, void *e) +{ + vlib_main_t *vm = vlib_get_main (); + u32 new_addr0, old_addr0, next0_tmp, fib_index; + u16 old_id0, new_id0, port, checksum0; + icmp_echo_header_t *echo0, *inner_echo0; + icmp46_header_t *inner_icmp0; + ip4_header_t *inner_ip0; + ip4_address_t addr; + void *l4_header; + u8 dont_translate; + ip_csum_t sum0; + nat_protocol_t proto; + + echo0 = (icmp_echo_header_t *) (icmp0 + 1); + next0_tmp = icmp_match_out2in_det (node, thread_index, b0, ip0, + &addr, &port, &fib_index, &proto, + d, e, &dont_translate); + if (next0_tmp != ~0) + next0 = next0_tmp; + if (next0 == DET44_OUT2IN_NEXT_DROP || dont_translate) + goto out; + + if (PREDICT_TRUE (!ip4_is_fragment (ip0))) + { + sum0 = + ip_incremental_checksum_buffer (vm, b0, + (u8 *) icmp0 - + (u8 *) vlib_buffer_get_current (b0), + ntohs (ip0->length) - + ip4_header_bytes (ip0), 0); + checksum0 = ~ip_csum_fold (sum0); + if (checksum0 != 0 && checksum0 != 0xffff) + { + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + } + + old_addr0 = ip0->dst_address.as_u32; + new_addr0 = ip0->dst_address.as_u32 = addr.as_u32; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + dst_address /* changed member */ ); + ip0->checksum = ip_csum_fold (sum0); + + + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + if (icmp0->checksum == 0) + icmp0->checksum = 0xffff; + + if (!icmp_type_is_error_message (icmp0->type)) + { + new_id0 = port; + if (PREDICT_FALSE (new_id0 != echo0->identifier)) + { + old_id0 = echo0->identifier; + new_id0 = port; + echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier /* changed member */ ); + icmp0->checksum = ip_csum_fold (sum0); + } + } + else + { + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); + + if (!ip4_header_checksum_is_valid (inner_ip0)) + { + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + + old_addr0 = inner_ip0->src_address.as_u32; + inner_ip0->src_address = addr; + new_addr0 = inner_ip0->src_address.as_u32; + + sum0 = icmp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + src_address /* changed member */ ); + icmp0->checksum = ip_csum_fold (sum0); + + switch (proto) + { + case NAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + + old_id0 = inner_echo0->identifier; + new_id0 = port; + inner_echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier); + icmp0->checksum = ip_csum_fold (sum0); + break; + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + old_id0 = ((tcp_udp_header_t *) l4_header)->src_port; + new_id0 = port; + ((tcp_udp_header_t *) l4_header)->src_port = new_id0; + + sum0 = icmp0->checksum; + sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t, + src_port); + icmp0->checksum = ip_csum_fold (sum0); + break; + default: + ASSERT (0); + } + } + } + +out: + return next0; +} +#endif + +VLIB_NODE_FN (det44_out2in_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + det44_out2in_next_t next_index; + u32 pkts_processed = 0; + det44_main_t *dm = &det44_main; + u32 thread_index = vm->thread_index; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t *b0, *b1; + u32 next0 = DET44_OUT2IN_NEXT_LOOKUP; + u32 next1 = DET44_OUT2IN_NEXT_LOOKUP; + u32 sw_if_index0, sw_if_index1; + ip4_header_t *ip0, *ip1; + ip_csum_t sum0, sum1; + ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1; + u16 new_port0, old_port0, old_port1, new_port1; + udp_header_t *udp0, *udp1; + tcp_header_t *tcp0, *tcp1; + u32 proto0, proto1; + snat_det_out_key_t key0, key1; + snat_det_map_t *mp0, *mp1; + snat_det_session_t *ses0 = 0, *ses1 = 0; + u32 rx_fib_index0, rx_fib_index1; + icmp46_header_t *icmp0, *icmp1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t *p2, *p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD); + } + + /* speculatively enqueue b0 and b1 to the current next frame */ + to_next[0] = bi0 = from[0]; + to_next[1] = bi1 = from[1]; + from += 2; + to_next += 2; + n_left_from -= 2; + n_left_to_next -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + if (PREDICT_FALSE (ip0->ttl == 1)) + { + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded, + ICMP4_time_exceeded_ttl_exceeded_in_transit, + 0); + next0 = DET44_OUT2IN_NEXT_ICMP_ERROR; + goto trace0; + } + + proto0 = ip_proto_to_nat_proto (ip0->protocol); + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) + { + rx_fib_index0 = + ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); + icmp0 = (icmp46_header_t *) udp0; + + next0 = det44_icmp_out2in (b0, ip0, icmp0, sw_if_index0, + rx_fib_index0, node, next0, + thread_index, &ses0, &mp0); + goto trace0; + } + + key0.ext_host_addr = ip0->src_address; + key0.ext_host_port = tcp0->src; + key0.out_port = tcp0->dst; + + mp0 = snat_det_map_by_out (&ip0->dst_address); + if (PREDICT_FALSE (!mp0)) + { + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip0->dst_address); + next0 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace0; + } + + snat_det_reverse (mp0, &ip0->dst_address, + clib_net_to_host_u16 (tcp0->dst), &new_addr0); + + ses0 = snat_det_get_ses_by_out (mp0, &new_addr0, key0.as_u64); + if (PREDICT_FALSE (!ses0)) + { + det44_log_info ("no match src %U:%d dst %U:%d for user %U", + format_ip4_address, &ip0->src_address, + clib_net_to_host_u16 (tcp0->src), + format_ip4_address, &ip0->dst_address, + clib_net_to_host_u16 (tcp0->dst), + format_ip4_address, &new_addr0); + next0 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace0; + } + old_port0 = udp0->dst_port; + udp0->dst_port = new_port0 = ses0->in_port; + + old_addr0 = ip0->dst_address; + ip0->dst_address = new_addr0; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->inside_fib_index; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_ESTABLISHED) + ses0->state = DET44_SESSION_TCP_CLOSE_WAIT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_LAST_ACK) + snat_det_ses_close (mp0, ses0); + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + tcp0->checksum = ip_csum_fold (sum0); + } + else if (udp0->checksum) + { + sum0 = udp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp0->checksum = ip_csum_fold (sum0); + } + + trace0: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_out2in_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + t->next_index = next0; + t->session_index = ~0; + if (ses0) + t->session_index = ses0 - mp0->sessions; + } + + pkts_processed += next0 != DET44_OUT2IN_NEXT_DROP; + + b1 = vlib_get_buffer (vm, bi1); + + ip1 = vlib_buffer_get_current (b1); + udp1 = ip4_next_header (ip1); + tcp1 = (tcp_header_t *) udp1; + + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + + if (PREDICT_FALSE (ip1->ttl == 1)) + { + vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded, + ICMP4_time_exceeded_ttl_exceeded_in_transit, + 0); + next1 = DET44_OUT2IN_NEXT_ICMP_ERROR; + goto trace1; + } + + proto1 = ip_proto_to_nat_proto (ip1->protocol); + + if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) + { + rx_fib_index1 = + ip4_fib_table_get_index_for_sw_if_index (sw_if_index1); + icmp1 = (icmp46_header_t *) udp1; + + next1 = det44_icmp_out2in (b1, ip1, icmp1, sw_if_index1, + rx_fib_index1, node, next1, + thread_index, &ses1, &mp1); + goto trace1; + } + + key1.ext_host_addr = ip1->src_address; + key1.ext_host_port = tcp1->src; + key1.out_port = tcp1->dst; + + mp1 = snat_det_map_by_out (&ip1->dst_address); + if (PREDICT_FALSE (!mp1)) + { + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip1->dst_address); + next1 = DET44_OUT2IN_NEXT_DROP; + b1->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace1; + } + + snat_det_reverse (mp1, &ip1->dst_address, + clib_net_to_host_u16 (tcp1->dst), &new_addr1); + + ses1 = snat_det_get_ses_by_out (mp1, &new_addr1, key1.as_u64); + if (PREDICT_FALSE (!ses1)) + { + det44_log_info ("no match src %U:%d dst %U:%d for user %U", + format_ip4_address, &ip1->src_address, + clib_net_to_host_u16 (tcp1->src), + format_ip4_address, &ip1->dst_address, + clib_net_to_host_u16 (tcp1->dst), + format_ip4_address, &new_addr1); + next1 = DET44_OUT2IN_NEXT_DROP; + b1->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace1; + } + old_port1 = udp1->dst_port; + udp1->dst_port = new_port1 = ses1->in_port; + + old_addr1 = ip1->dst_address; + ip1->dst_address = new_addr1; + vnet_buffer (b1)->sw_if_index[VLIB_TX] = dm->inside_fib_index; + + sum1 = ip1->checksum; + sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + ip1->checksum = ip_csum_fold (sum1); + + if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP)) + { + if (tcp1->flags & TCP_FLAG_FIN + && ses1->state == DET44_SESSION_TCP_ESTABLISHED) + ses1->state = DET44_SESSION_TCP_CLOSE_WAIT; + else if (tcp1->flags & TCP_FLAG_ACK + && ses1->state == DET44_SESSION_TCP_LAST_ACK) + snat_det_ses_close (mp1, ses1); + + sum1 = tcp1->checksum; + sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum1 = ip_csum_update (sum1, old_port1, new_port1, + ip4_header_t /* cheat */ , + length /* changed member */ ); + tcp1->checksum = ip_csum_fold (sum1); + } + else if (udp1->checksum) + { + sum1 = udp1->checksum; + sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum1 = ip_csum_update (sum1, old_port1, new_port1, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp1->checksum = ip_csum_fold (sum1); + } + + trace1: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b1->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_out2in_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->sw_if_index = sw_if_index1; + t->next_index = next1; + t->session_index = ~0; + if (ses1) + t->session_index = ses1 - mp1->sessions; + } + + pkts_processed += next1 != DET44_OUT2IN_NEXT_DROP; + + /* verify speculative enqueues, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + u32 next0 = DET44_OUT2IN_NEXT_LOOKUP; + u32 sw_if_index0; + ip4_header_t *ip0; + ip_csum_t sum0; + ip4_address_t new_addr0, old_addr0; + u16 new_port0, old_port0; + udp_header_t *udp0; + tcp_header_t *tcp0; + u32 proto0; + snat_det_out_key_t key0; + snat_det_map_t *mp0; + snat_det_session_t *ses0 = 0; + u32 rx_fib_index0; + icmp46_header_t *icmp0; + + /* speculatively enqueue b0 to the current next frame */ + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + if (PREDICT_FALSE (ip0->ttl == 1)) + { + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; + icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded, + ICMP4_time_exceeded_ttl_exceeded_in_transit, + 0); + next0 = DET44_OUT2IN_NEXT_ICMP_ERROR; + goto trace00; + } + + proto0 = ip_proto_to_nat_proto (ip0->protocol); + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) + { + rx_fib_index0 = + ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); + icmp0 = (icmp46_header_t *) udp0; + + next0 = det44_icmp_out2in (b0, ip0, icmp0, sw_if_index0, + rx_fib_index0, node, next0, + thread_index, &ses0, &mp0); + goto trace00; + } + + key0.ext_host_addr = ip0->src_address; + key0.ext_host_port = tcp0->src; + key0.out_port = tcp0->dst; + + mp0 = snat_det_map_by_out (&ip0->dst_address); + if (PREDICT_FALSE (!mp0)) + { + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip0->dst_address); + next0 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace00; + } + + snat_det_reverse (mp0, &ip0->dst_address, + clib_net_to_host_u16 (tcp0->dst), &new_addr0); + + ses0 = snat_det_get_ses_by_out (mp0, &new_addr0, key0.as_u64); + if (PREDICT_FALSE (!ses0)) + { + det44_log_info ("no match src %U:%d dst %U:%d for user %U", + format_ip4_address, &ip0->src_address, + clib_net_to_host_u16 (tcp0->src), + format_ip4_address, &ip0->dst_address, + clib_net_to_host_u16 (tcp0->dst), + format_ip4_address, &new_addr0); + next0 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace00; + } + old_port0 = udp0->dst_port; + udp0->dst_port = new_port0 = ses0->in_port; + + old_addr0 = ip0->dst_address; + ip0->dst_address = new_addr0; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->inside_fib_index; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + ip0->checksum = ip_csum_fold (sum0); + + if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_ESTABLISHED) + ses0->state = DET44_SESSION_TCP_CLOSE_WAIT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_LAST_ACK) + snat_det_ses_close (mp0, ses0); + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + tcp0->checksum = ip_csum_fold (sum0); + } + else if (udp0->checksum) + { + sum0 = udp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, + ip4_header_t, + dst_address /* changed member */ ); + sum0 = ip_csum_update (sum0, old_port0, new_port0, + ip4_header_t /* cheat */ , + length /* changed member */ ); + udp0->checksum = ip_csum_fold (sum0); + } + + trace00: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_out2in_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + t->next_index = next0; + t->session_index = ~0; + if (ses0) + t->session_index = ses0 - mp0->sessions; + } + + pkts_processed += next0 != DET44_OUT2IN_NEXT_DROP; + + /* verify speculative enqueue, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + vlib_node_increment_counter (vm, dm->out2in_node_index, + DET44_OUT2IN_ERROR_OUT2IN_PACKETS, + pkts_processed); + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (det44_out2in_node) = { + .name = "det44-out2in", + .vector_size = sizeof (u32), + .format_trace = format_det44_out2in_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN(det44_out2in_error_strings), + .error_strings = det44_out2in_error_strings, + .runtime_data_bytes = sizeof (det44_runtime_t), + .n_next_nodes = DET44_OUT2IN_N_NEXT, + /* edit / add dispositions here */ + .next_nodes = { + [DET44_OUT2IN_NEXT_DROP] = "error-drop", + [DET44_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", + [DET44_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |