From a210798c407035f09c10c018ebdaf12312161730 Mon Sep 17 00:00:00 2001 From: Filip Varga Date: Thu, 10 Dec 2020 15:55:25 +0100 Subject: nat: refactor and split fo EI/ED features This patch is aimed at moving EI features out of NAT44 plugin & split of EI/ED functions. Type: refactor Change-Id: I63cf70a264ed2512708fe92665d64f04690783d0 Signed-off-by: Filip Varga --- src/plugins/nat/nat44-ei/nat44_ei_out2in.c | 1580 ++++++++++++++++++++++++++++ 1 file changed, 1580 insertions(+) create mode 100644 src/plugins/nat/nat44-ei/nat44_ei_out2in.c (limited to 'src/plugins/nat/nat44-ei/nat44_ei_out2in.c') diff --git a/src/plugins/nat/nat44-ei/nat44_ei_out2in.c b/src/plugins/nat/nat44-ei/nat44_ei_out2in.c new file mode 100644 index 00000000000..8220f0dc9d8 --- /dev/null +++ b/src/plugins/nat/nat44-ei/nat44_ei_out2in.c @@ -0,0 +1,1580 @@ +/* + * Copyright (c) 2016 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 NAT44 endpoint-dependent outside to inside network translation + */ + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +typedef struct +{ + u32 sw_if_index; + u32 next_index; + u32 session_index; +} snat_out2in_trace_t; + +/* packet trace format function */ +static u8 * +format_snat_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 *); + snat_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *); + + s = + format (s, + "NAT44_OUT2IN: sw_if_index %d, next index %d, session index %d", + t->sw_if_index, t->next_index, t->session_index); + return s; +} + +static u8 * +format_snat_out2in_fast_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 *); + snat_out2in_trace_t *t = va_arg (*args, snat_out2in_trace_t *); + + s = format (s, "NAT44_OUT2IN_FAST: sw_if_index %d, next index %d", + t->sw_if_index, t->next_index); + return s; +} + +#define foreach_snat_out2in_error \ +_(UNSUPPORTED_PROTOCOL, "unsupported protocol") \ +_(OUT_OF_PORTS, "out of ports") \ +_(BAD_ICMP_TYPE, "unsupported ICMP type") \ +_(NO_TRANSLATION, "no translation") \ +_(MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \ +_(CANNOT_CREATE_USER, "cannot create NAT user") + +typedef enum +{ +#define _(sym,str) SNAT_OUT2IN_ERROR_##sym, + foreach_snat_out2in_error +#undef _ + SNAT_OUT2IN_N_ERROR, +} snat_out2in_error_t; + +static char *snat_out2in_error_strings[] = { +#define _(sym,string) string, + foreach_snat_out2in_error +#undef _ +}; + +typedef enum +{ + SNAT_OUT2IN_NEXT_DROP, + SNAT_OUT2IN_NEXT_LOOKUP, + SNAT_OUT2IN_NEXT_ICMP_ERROR, + SNAT_OUT2IN_N_NEXT, +} snat_out2in_next_t; + +#ifndef CLIB_MARCH_VARIANT +int +nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg) +{ + snat_main_t *sm = &snat_main; + nat44_is_idle_session_ctx_t *ctx = arg; + snat_session_t *s; + u64 sess_timeout_time; + snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, + ctx->thread_index); + clib_bihash_kv_8_8_t s_kv; + + s = pool_elt_at_index (tsm->sessions, kv->value); + sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s); + if (ctx->now >= sess_timeout_time) + { + init_nat_i2o_k (&s_kv, s); + if (clib_bihash_add_del_8_8 (&tsm->in2out, &s_kv, 0)) + nat_elog_warn ("out2in key del failed"); + + nat_ipfix_logging_nat44_ses_delete (ctx->thread_index, + s->in2out.addr.as_u32, + s->out2in.addr.as_u32, + s->nat_proto, + s->in2out.port, + s->out2in.port, + s->in2out.fib_index); + + nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index, + &s->in2out.addr, s->in2out.port, + &s->out2in.addr, s->out2in.port, s->nat_proto); + + nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr, + s->ext_host_port, s->nat_proto, s->out2in.fib_index, + ctx->thread_index); + + if (!snat_is_session_static (s)) + snat_free_outside_address_and_port (sm->addresses, ctx->thread_index, + &s->out2in.addr, s->out2in.port, + s->nat_proto); + + nat44_delete_session (sm, s, ctx->thread_index); + return 1; + } + + return 0; +} +#endif + +/** + * @brief Create session for static mapping. + * + * Create NAT session initiated by host from external network with static + * mapping. + * + * @param sm NAT main. + * @param b0 Vlib buffer. + * @param in2out In2out NAT44 session key. + * @param out2in Out2in NAT44 session key. + * @param node Vlib node. + * + * @returns SNAT session if successfully created otherwise 0. + */ +static inline snat_session_t * +create_session_for_static_mapping (snat_main_t * sm, + vlib_buffer_t * b0, + ip4_address_t i2o_addr, + u16 i2o_port, + u32 i2o_fib_index, + ip4_address_t o2i_addr, + u16 o2i_port, + u32 o2i_fib_index, + nat_protocol_t proto, + vlib_node_runtime_t * node, + u32 thread_index, f64 now) +{ + snat_user_t *u; + snat_session_t *s; + clib_bihash_kv_8_8_t kv0; + ip4_header_t *ip0; + udp_header_t *udp0; + nat44_is_idle_session_ctx_t ctx0; + + if (PREDICT_FALSE (nat44_ei_maximum_sessions_exceeded (sm, thread_index))) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED]; + nat_elog_notice ("maximum sessions exceeded"); + return 0; + } + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + + u = nat_user_get_or_create (sm, &i2o_addr, i2o_fib_index, thread_index); + if (!u) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_CANNOT_CREATE_USER]; + return 0; + } + + s = nat_session_alloc_or_recycle (sm, u, thread_index, now); + if (!s) + { + nat44_delete_user_with_no_session (sm, u, thread_index); + nat_elog_warn ("create NAT session failed"); + return 0; + } + + s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; + s->ext_host_addr.as_u32 = ip0->src_address.as_u32; + s->ext_host_port = udp0->src_port; + user_session_increment (sm, u, 1 /* static */ ); + s->in2out.addr = i2o_addr; + s->in2out.port = i2o_port; + s->in2out.fib_index = i2o_fib_index; + s->out2in.addr = o2i_addr; + s->out2in.port = o2i_port; + s->out2in.fib_index = o2i_fib_index; + s->nat_proto = proto; + + /* Add to translation hashes */ + ctx0.now = now; + ctx0.thread_index = thread_index; + init_nat_i2o_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions); + if (clib_bihash_add_or_overwrite_stale_8_8 + (&sm->per_thread_data[thread_index].in2out, &kv0, + nat44_i2o_is_idle_session_cb, &ctx0)) + nat_elog_notice ("in2out key add failed"); + + init_nat_o2i_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions); + if (clib_bihash_add_or_overwrite_stale_8_8 + (&sm->per_thread_data[thread_index].out2in, &kv0, + nat44_o2i_is_idle_session_cb, &ctx0)) + nat_elog_notice ("out2in key add failed"); + + /* log NAT event */ + nat_ipfix_logging_nat44_ses_create (thread_index, + s->in2out.addr.as_u32, + s->out2in.addr.as_u32, + s->nat_proto, + s->in2out.port, + s->out2in.port, s->in2out.fib_index); + + nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index, + &s->in2out.addr, s->in2out.port, &s->out2in.addr, + s->out2in.port, s->nat_proto); + + nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr, + s->out2in.port, &s->ext_host_addr, s->ext_host_port, + &s->ext_host_nat_addr, s->ext_host_nat_port, + s->nat_proto, s->in2out.fib_index, s->flags, thread_index, 0); + + return s; +} + +#ifndef CLIB_MARCH_VARIANT +static_always_inline snat_out2in_error_t +icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0, + ip4_address_t * addr, u16 * port, nat_protocol_t * nat_proto) +{ + icmp46_header_t *icmp0; + icmp_echo_header_t *echo0, *inner_echo0 = 0; + ip4_header_t *inner_ip0; + void *l4_header = 0; + icmp46_header_t *inner_icmp0; + + icmp0 = (icmp46_header_t *) ip4_next_header (ip0); + echo0 = (icmp_echo_header_t *) (icmp0 + 1); + + if (!icmp_type_is_error_message + (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)) + { + *nat_proto = NAT_PROTOCOL_ICMP; + *addr = ip0->dst_address; + *port = vnet_buffer (b)->ip.reass.l4_src_port; + } + else + { + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); + *nat_proto = ip_proto_to_nat_proto (inner_ip0->protocol); + *addr = inner_ip0->src_address; + switch (*nat_proto) + { + case NAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + *port = inner_echo0->identifier; + break; + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + *port = ((tcp_udp_header_t *) l4_header)->src_port; + break; + default: + return SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL; + } + } + return -1; /* success */ +} + +/** + * Get address and port values to be used for ICMP packet translation + * and create session if needed + * + * @param[in,out] sm NAT main + * @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_slow (snat_main_t * sm, 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) +{ + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + u32 sw_if_index0; + snat_session_t *s0 = 0; + clib_bihash_kv_8_8_t kv0, value0; + u8 is_addr_only; + u32 next0 = ~0; + int err; + u8 identity_nat; + vlib_main_t *vm = vlib_get_main (); + *dont_translate = 0; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); + + *proto = 0; + + err = icmp_get_key (b0, ip0, addr, port, proto); + if (err != -1) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + + ip4_address_t mapping_addr; + u16 mapping_port; + u32 mapping_fib_index; + + init_nat_k (&kv0, *addr, *port, *fib_index, *proto); + if (clib_bihash_search_8_8 (&tsm->out2in, &kv0, &value0)) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + if (snat_static_mapping_match + (sm, *addr, *port, *fib_index, *proto, + &mapping_addr, &mapping_port, &mapping_fib_index, 1, &is_addr_only, + 0, 0, 0, &identity_nat, 0)) + { + if (!sm->forwarding_enabled) + { + /* Don't NAT packet aimed at the intfc address */ + if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0, + ip0->dst_address.as_u32))) + { + *dont_translate = 1; + goto out; + } + b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + else + { + *dont_translate = 1; + goto out; + } + } + + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_reply + && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_request || !is_addr_only))) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + + if (PREDICT_FALSE (identity_nat)) + { + *dont_translate = 1; + goto out; + } + /* Create session initiated by host from external network */ + s0 = + create_session_for_static_mapping (sm, b0, mapping_addr, mapping_port, + mapping_fib_index, *addr, *port, + *fib_index, *proto, node, + thread_index, vlib_time_now (vm)); + + if (!s0) + { + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + } + else + { + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_reply + && 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[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + + s0 = pool_elt_at_index (tsm->sessions, value0.value); + } + +out: + if (s0) + { + *addr = s0->in2out.addr; + *port = s0->in2out.port; + *fib_index = s0->in2out.fib_index; + } + if (d) + *(snat_session_t **) d = s0; + return next0; +} +#endif + +#ifndef CLIB_MARCH_VARIANT +/** + * Get address and port values to be used for ICMP packet translation + * + * @param[in] sm NAT main + * @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_fast (snat_main_t * sm, vlib_node_runtime_t * node, + u32 thread_index, vlib_buffer_t * b0, + ip4_header_t * ip0, ip4_address_t * mapping_addr, + u16 * mapping_port, u32 * mapping_fib_index, + nat_protocol_t * proto, void *d, void *e, + u8 * dont_translate) +{ + u32 sw_if_index0; + u32 rx_fib_index0; + u8 is_addr_only; + u32 next0 = ~0; + int err; + ip4_address_t addr; + u16 port; + *dont_translate = 0; + + 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); + + err = icmp_get_key (b0, ip0, &addr, &port, proto); + if (err != -1) + { + b0->error = node->errors[err]; + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + if (snat_static_mapping_match + (sm, addr, port, rx_fib_index0, *proto, mapping_addr, mapping_port, + mapping_fib_index, 1, &is_addr_only, 0, 0, 0, 0, 0)) + { + /* Don't NAT packet aimed at the intfc address */ + if (is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32)) + { + *dont_translate = 1; + goto out; + } + b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply + && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != + ICMP4_echo_request || !is_addr_only) + && !icmp_type_is_error_message (vnet_buffer (b0)->ip. + reass.icmp_type_or_tcp_flags))) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; + next0 = SNAT_OUT2IN_NEXT_DROP; + goto out; + } + +out: + return next0; +} +#endif + +#ifndef CLIB_MARCH_VARIANT +u32 +icmp_out2in (snat_main_t * sm, + 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) +{ + icmp_echo_header_t *echo0, *inner_echo0 = 0; + ip4_header_t *inner_ip0 = 0; + void *l4_header = 0; + icmp46_header_t *inner_icmp0; + u8 dont_translate; + u32 new_addr0, old_addr0; + u16 old_id0, new_id0; + ip_csum_t sum0; + u16 checksum0; + u32 next0_tmp; + vlib_main_t *vm = vlib_get_main (); + ip4_address_t addr; + u16 port; + u32 fib_index; + nat_protocol_t proto; + + echo0 = (icmp_echo_header_t *) (icmp0 + 1); + + next0_tmp = sm->icmp_match_out2in_cb (sm, node, thread_index, b0, ip0, + &addr, &port, &fib_index, &proto, + d, e, &dont_translate); + if (next0_tmp != ~0) + next0 = next0_tmp; + if (next0 == SNAT_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 = SNAT_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 = SNAT_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 + +static inline u32 +icmp_out2in_slow_path (snat_main_t * sm, + 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, f64 now, + u32 thread_index, snat_session_t ** p_s0) +{ + vlib_main_t *vm = vlib_get_main (); + + next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, + next0, thread_index, p_s0, 0); + snat_session_t *s0 = *p_s0; + if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP && s0)) + { + /* Accounting */ + nat44_ei_session_update_counters ( + s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); + /* Per-user LRU list maintenance */ + nat44_session_update_lru (sm, s0, thread_index); + } + return next0; +} + +static int +nat_out2in_sm_unknown_proto (snat_main_t * sm, + vlib_buffer_t * b, + ip4_header_t * ip, u32 rx_fib_index) +{ + clib_bihash_kv_8_8_t kv, value; + snat_static_mapping_t *m; + u32 old_addr, new_addr; + ip_csum_t sum; + + init_nat_k (&kv, ip->dst_address, 0, 0, 0); + if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) + return 1; + + m = pool_elt_at_index (sm->static_mappings, value.value); + + old_addr = ip->dst_address.as_u32; + new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32; + sum = ip->checksum; + sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address); + ip->checksum = ip_csum_fold (sum); + + vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index; + return 0; +} + +VLIB_NODE_FN (snat_out2in_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from; + snat_main_t *sm = &snat_main; + f64 now = vlib_time_now (vm); + u32 thread_index = vm->thread_index; + snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + u16 nexts[VLIB_FRAME_SIZE], *next = nexts; + vlib_get_buffers (vm, from, b, n_left_from); + + while (n_left_from >= 2) + { + vlib_buffer_t *b0, *b1; + u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP; + u32 next1 = SNAT_OUT2IN_NEXT_LOOKUP; + u32 sw_if_index0, sw_if_index1; + ip4_header_t *ip0, *ip1; + ip_csum_t sum0, sum1; + u32 new_addr0, old_addr0; + u16 new_port0, old_port0; + u32 new_addr1, old_addr1; + u16 new_port1, old_port1; + udp_header_t *udp0, *udp1; + tcp_header_t *tcp0, *tcp1; + icmp46_header_t *icmp0, *icmp1; + u32 rx_fib_index0, rx_fib_index1; + u32 proto0, proto1; + snat_session_t *s0 = 0, *s1 = 0; + clib_bihash_kv_8_8_t kv0, kv1, value0, value1; + u8 identity_nat0, identity_nat1; + ip4_address_t sm_addr0, sm_addr1; + u16 sm_port0, sm_port1; + u32 sm_fib_index0, sm_fib_index1; + + b0 = *b; + b++; + b1 = *b; + b++; + + /* Prefetch next iteration. */ + if (PREDICT_TRUE (n_left_from >= 4)) + { + vlib_buffer_t *p2, *p3; + + p2 = *b; + p3 = *(b + 1); + + 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); + } + + vnet_buffer (b0)->snat.flags = 0; + vnet_buffer (b1)->snat.flags = 0; + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + icmp0 = (icmp46_header_t *) udp0; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index, + sw_if_index0); + + 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 = SNAT_OUT2IN_NEXT_ICMP_ERROR; + goto trace0; + } + + proto0 = ip_proto_to_nat_proto (ip0->protocol); + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) + { + if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0)) + { + if (!sm->forwarding_enabled) + { + b0->error = + node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; + next0 = SNAT_OUT2IN_NEXT_DROP; + } + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.other, + thread_index, sw_if_index0, 1); + + goto trace0; + } + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) + { + next0 = icmp_out2in_slow_path + (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, + next0, now, thread_index, &s0); + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.icmp, + thread_index, sw_if_index0, 1); + goto trace0; + } + + init_nat_k (&kv0, ip0->dst_address, + vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, + proto0); + if (clib_bihash_search_8_8 + (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + if (snat_static_mapping_match + (sm, ip0->dst_address, + vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, + proto0, &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, 0, 0, + 0, &identity_nat0, 0)) + { + /* + * Send DHCP packets to the ipv4 stack, or we won't + * be able to use dhcp client on the outside interface + */ + if (PREDICT_FALSE + (proto0 == NAT_PROTOCOL_UDP + && (vnet_buffer (b0)->ip.reass.l4_dst_port == + clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) + { + vnet_feature_next (&next0, b0); + goto trace0; + } + + if (!sm->forwarding_enabled) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; + next0 = SNAT_OUT2IN_NEXT_DROP; + } + goto trace0; + } + + if (PREDICT_FALSE (identity_nat0)) + goto trace0; + + /* Create session initiated by host from external network */ + s0 = create_session_for_static_mapping (sm, b0, + sm_addr0, sm_port0, + sm_fib_index0, + ip0->dst_address, + vnet_buffer (b0)->ip. + reass.l4_dst_port, + rx_fib_index0, proto0, node, + thread_index, now); + if (!s0) + { + next0 = SNAT_OUT2IN_NEXT_DROP; + goto trace0; + } + } + else + s0 = pool_elt_at_index (tsm->sessions, value0.value); + + old_addr0 = ip0->dst_address.as_u32; + ip0->dst_address = s0->in2out.addr; + new_addr0 = ip0->dst_address.as_u32; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.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 (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, + 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); + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.tcp, + thread_index, sw_if_index0, 1); + } + else + { + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + if (PREDICT_FALSE (udp0->checksum)) + { + sum0 = udp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, 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); + } + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.udp, + thread_index, sw_if_index0, 1); + } + + /* Accounting */ + nat44_ei_session_update_counters ( + s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); + /* Per-user LRU list maintenance */ + nat44_session_update_lru (sm, s0, thread_index); + trace0: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + snat_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 (s0) + t->session_index = + s0 - sm->per_thread_data[thread_index].sessions; + } + + if (next0 == SNAT_OUT2IN_NEXT_DROP) + { + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.drops, + thread_index, sw_if_index0, 1); + } + + + ip1 = vlib_buffer_get_current (b1); + udp1 = ip4_next_header (ip1); + tcp1 = (tcp_header_t *) udp1; + icmp1 = (icmp46_header_t *) udp1; + + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index, + sw_if_index1); + + 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 = SNAT_OUT2IN_NEXT_ICMP_ERROR; + goto trace1; + } + + proto1 = ip_proto_to_nat_proto (ip1->protocol); + + if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER)) + { + if (nat_out2in_sm_unknown_proto (sm, b1, ip1, rx_fib_index1)) + { + if (!sm->forwarding_enabled) + { + b1->error = + node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; + next1 = SNAT_OUT2IN_NEXT_DROP; + } + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.other, + thread_index, sw_if_index1, 1); + goto trace1; + } + + if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) + { + next1 = icmp_out2in_slow_path + (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, + next1, now, thread_index, &s1); + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.icmp, + thread_index, sw_if_index1, 1); + goto trace1; + } + + init_nat_k (&kv1, ip1->dst_address, + vnet_buffer (b1)->ip.reass.l4_dst_port, rx_fib_index1, + proto1); + + if (clib_bihash_search_8_8 + (&sm->per_thread_data[thread_index].out2in, &kv1, &value1)) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + if (snat_static_mapping_match + (sm, ip1->dst_address, + vnet_buffer (b1)->ip.reass.l4_dst_port, proto1, + rx_fib_index1, &sm_addr1, &sm_port1, &sm_fib_index1, 1, 0, + 0, 0, 0, &identity_nat1, 0)) + { + /* + * Send DHCP packets to the ipv4 stack, or we won't + * be able to use dhcp client on the outside interface + */ + if (PREDICT_FALSE + (proto1 == NAT_PROTOCOL_UDP + && (vnet_buffer (b1)->ip.reass.l4_dst_port == + clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) + { + vnet_feature_next (&next1, b1); + goto trace1; + } + + if (!sm->forwarding_enabled) + { + b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; + next1 = SNAT_OUT2IN_NEXT_DROP; + } + goto trace1; + } + + if (PREDICT_FALSE (identity_nat1)) + goto trace1; + + /* Create session initiated by host from external network */ + s1 = + create_session_for_static_mapping (sm, b1, sm_addr1, sm_port1, + sm_fib_index1, + ip1->dst_address, + vnet_buffer (b1)->ip. + reass.l4_dst_port, + rx_fib_index1, proto1, node, + thread_index, now); + if (!s1) + { + next1 = SNAT_OUT2IN_NEXT_DROP; + goto trace1; + } + } + else + s1 = + pool_elt_at_index (sm->per_thread_data[thread_index].sessions, + value1.value); + + old_addr1 = ip1->dst_address.as_u32; + ip1->dst_address = s1->in2out.addr; + new_addr1 = ip1->dst_address.as_u32; + vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->in2out.fib_index; + + sum1 = ip1->checksum; + sum1 = ip_csum_update (sum1, old_addr1, new_addr1, + ip4_header_t, dst_address /* changed member */ ); + ip1->checksum = ip_csum_fold (sum1); + + if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP)) + { + if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment) + { + old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port; + new_port1 = udp1->dst_port = s1->in2out.port; + + sum1 = tcp1->checksum; + sum1 = ip_csum_update (sum1, old_addr1, new_addr1, + 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); + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.tcp, + thread_index, sw_if_index1, 1); + } + else + { + if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment) + { + old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port; + new_port1 = udp1->dst_port = s1->in2out.port; + if (PREDICT_FALSE (udp1->checksum)) + { + + sum1 = udp1->checksum; + sum1 = + ip_csum_update (sum1, old_addr1, new_addr1, + 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); + } + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.udp, + thread_index, sw_if_index1, 1); + } + + /* Accounting */ + nat44_ei_session_update_counters ( + s1, now, vlib_buffer_length_in_chain (vm, b1), thread_index); + /* Per-user LRU list maintenance */ + nat44_session_update_lru (sm, s1, thread_index); + trace1: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b1->flags & VLIB_BUFFER_IS_TRACED))) + { + snat_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 (s1) + t->session_index = + s1 - sm->per_thread_data[thread_index].sessions; + } + + if (next1 == SNAT_OUT2IN_NEXT_DROP) + { + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.drops, + thread_index, sw_if_index1, 1); + } + + n_left_from -= 2; + next[0] = next0; + next[1] = next1; + next += 2; + } + + while (n_left_from > 0) + { + vlib_buffer_t *b0; + u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP; + u32 sw_if_index0; + ip4_header_t *ip0; + ip_csum_t sum0; + u32 new_addr0, old_addr0; + u16 new_port0, old_port0; + udp_header_t *udp0; + tcp_header_t *tcp0; + icmp46_header_t *icmp0; + u32 rx_fib_index0; + u32 proto0; + snat_session_t *s0 = 0; + clib_bihash_kv_8_8_t kv0, value0; + u8 identity_nat0; + ip4_address_t sm_addr0; + u16 sm_port0; + u32 sm_fib_index0; + + b0 = *b; + ++b; + + vnet_buffer (b0)->snat.flags = 0; + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + icmp0 = (icmp46_header_t *) udp0; + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index, + sw_if_index0); + + proto0 = ip_proto_to_nat_proto (ip0->protocol); + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) + { + if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0)) + { + if (!sm->forwarding_enabled) + { + b0->error = + node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; + next0 = SNAT_OUT2IN_NEXT_DROP; + } + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.other, + thread_index, sw_if_index0, 1); + goto trace00; + } + + 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 = SNAT_OUT2IN_NEXT_ICMP_ERROR; + goto trace00; + } + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) + { + next0 = icmp_out2in_slow_path + (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, + next0, now, thread_index, &s0); + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.icmp, + thread_index, sw_if_index0, 1); + goto trace00; + } + + init_nat_k (&kv0, ip0->dst_address, + vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, + proto0); + + if (clib_bihash_search_8_8 + (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) + { + /* Try to match static mapping by external address and port, + destination address and port in packet */ + if (snat_static_mapping_match + (sm, ip0->dst_address, + vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, + proto0, &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, 0, 0, + 0, &identity_nat0, 0)) + { + /* + * Send DHCP packets to the ipv4 stack, or we won't + * be able to use dhcp client on the outside interface + */ + if (PREDICT_FALSE + (proto0 == NAT_PROTOCOL_UDP + && (vnet_buffer (b0)->ip.reass.l4_dst_port == + clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) + { + vnet_feature_next (&next0, b0); + goto trace00; + } + + if (!sm->forwarding_enabled) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; + next0 = SNAT_OUT2IN_NEXT_DROP; + } + goto trace00; + } + + if (PREDICT_FALSE (identity_nat0)) + goto trace00; + + /* Create session initiated by host from external network */ + s0 = create_session_for_static_mapping (sm, b0, + sm_addr0, sm_port0, + sm_fib_index0, + ip0->dst_address, + vnet_buffer (b0)->ip. + reass.l4_dst_port, + rx_fib_index0, proto0, node, + thread_index, now); + if (!s0) + { + next0 = SNAT_OUT2IN_NEXT_DROP; + goto trace00; + } + } + else + s0 = + pool_elt_at_index (sm->per_thread_data[thread_index].sessions, + value0.value); + + old_addr0 = ip0->dst_address.as_u32; + ip0->dst_address = s0->in2out.addr; + new_addr0 = ip0->dst_address.as_u32; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.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 (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, + 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); + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.tcp, + thread_index, sw_if_index0, 1); + } + else + { + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; + new_port0 = udp0->dst_port = s0->in2out.port; + if (PREDICT_FALSE (udp0->checksum)) + { + sum0 = udp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, 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); + } + } + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.udp, + thread_index, sw_if_index0, 1); + } + + /* Accounting */ + nat44_ei_session_update_counters ( + s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); + /* Per-user LRU list maintenance */ + nat44_session_update_lru (sm, s0, thread_index); + trace00: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + snat_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 (s0) + t->session_index = + s0 - sm->per_thread_data[thread_index].sessions; + } + + if (next0 == SNAT_OUT2IN_NEXT_DROP) + { + vlib_increment_simple_counter (&sm->counters.slowpath.out2in.drops, + thread_index, sw_if_index0, 1); + } + + n_left_from--; + next[0] = next0; + next++; + } + + vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts, + frame->n_vectors); + + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (snat_out2in_node) = { + .name = "nat44-out2in", + .vector_size = sizeof (u32), + .format_trace = format_snat_out2in_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(snat_out2in_error_strings), + .error_strings = snat_out2in_error_strings, + + .runtime_data_bytes = sizeof (snat_runtime_t), + + .n_next_nodes = SNAT_OUT2IN_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [SNAT_OUT2IN_NEXT_DROP] = "error-drop", + [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", + [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FN (snat_out2in_fast_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from; + snat_main_t *sm = &snat_main; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; + u16 nexts[VLIB_FRAME_SIZE], *next = nexts; + vlib_get_buffers (vm, from, b, n_left_from); + while (n_left_from > 0) + { + vlib_buffer_t *b0; + u32 next0 = SNAT_OUT2IN_NEXT_DROP; + u32 sw_if_index0; + ip4_header_t *ip0; + ip_csum_t sum0; + u32 new_addr0, old_addr0; + u16 new_port0, old_port0; + udp_header_t *udp0; + tcp_header_t *tcp0; + icmp46_header_t *icmp0; + u32 proto0; + u32 rx_fib_index0; + ip4_address_t sm_addr0; + u16 sm_port0; + u32 sm_fib_index0; + + b0 = *b; + b++; + + ip0 = vlib_buffer_get_current (b0); + udp0 = ip4_next_header (ip0); + tcp0 = (tcp_header_t *) udp0; + icmp0 = (icmp46_header_t *) udp0; + + 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); + + vnet_feature_next (&next0, b0); + + 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 = SNAT_OUT2IN_NEXT_ICMP_ERROR; + goto trace00; + } + + proto0 = ip_proto_to_nat_proto (ip0->protocol); + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) + goto trace00; + + if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) + { + next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, + rx_fib_index0, node, next0, ~0, 0, 0); + goto trace00; + } + + if (snat_static_mapping_match + (sm, ip0->dst_address, udp0->dst_port, rx_fib_index0, proto0, + &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, 0, 0, 0, 0, 0)) + { + b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace00; + } + + new_addr0 = sm_addr0.as_u32; + new_port0 = sm_port0; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm_fib_index0; + old_addr0 = ip0->dst_address.as_u32; + ip0->dst_address.as_u32 = new_addr0; + + 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 (PREDICT_FALSE (new_port0 != udp0->dst_port)) + { + old_port0 = udp0->dst_port; + udp0->dst_port = new_port0; + + if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, + 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, new_addr0, + 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); + } + } + else + { + if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) + { + sum0 = tcp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, + ip4_header_t, + dst_address /* changed member */ ); + tcp0->checksum = ip_csum_fold (sum0); + } + else if (udp0->checksum) + { + sum0 = udp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, + ip4_header_t, + dst_address /* changed member */ ); + udp0->checksum = ip_csum_fold (sum0); + } + } + + trace00: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + snat_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + t->next_index = next0; + } + + if (next0 == SNAT_OUT2IN_NEXT_DROP) + { + vlib_increment_simple_counter (&sm->counters.fastpath.out2in.drops, + vm->thread_index, sw_if_index0, 1); + } + + n_left_from--; + next[0] = next0; + next++; + } + + vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts, + frame->n_vectors); + + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (snat_out2in_fast_node) = { + .name = "nat44-out2in-fast", + .vector_size = sizeof (u32), + .format_trace = format_snat_out2in_fast_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(snat_out2in_error_strings), + .error_strings = snat_out2in_error_strings, + + .runtime_data_bytes = sizeof (snat_runtime_t), + + .n_next_nodes = SNAT_OUT2IN_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", + [SNAT_OUT2IN_NEXT_DROP] = "error-drop", + [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ -- cgit 1.2.3-korg