diff options
Diffstat (limited to 'src/plugins/nat/nat44-ed/nat44_ed.c')
| -rw-r--r-- | src/plugins/nat/nat44-ed/nat44_ed.c | 3610 |
1 files changed, 3610 insertions, 0 deletions
diff --git a/src/plugins/nat/nat44-ed/nat44_ed.c b/src/plugins/nat/nat44-ed/nat44_ed.c new file mode 100644 index 00000000000..d9d35fc55bc --- /dev/null +++ b/src/plugins/nat/nat44-ed/nat44_ed.c @@ -0,0 +1,3610 @@ +/* + * snat.c - simple nat plugin + * + * 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. + */ + +#include <vpp/app/version.h> + +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/ip/ip4.h> +#include <vnet/ip/ip_table.h> +#include <vnet/ip/reass/ip4_sv_reass.h> +#include <vnet/fib/fib_table.h> +#include <vnet/fib/ip4_fib.h> +#include <vnet/plugin/plugin.h> +#include <vppinfra/bihash_16_8.h> + +#include <nat/lib/log.h> +#include <nat/lib/nat_syslog.h> +#include <nat/lib/nat_inlines.h> +#include <nat/lib/ipfix_logging.h> + +#include <nat/nat44-ed/nat44_ed.h> +#include <nat/nat44-ed/nat44_ed_affinity.h> +#include <nat/nat44-ed/nat44_ed_inlines.h> + +snat_main_t snat_main; + +static_always_inline void nat_validate_interface_counters (snat_main_t *sm, + u32 sw_if_index); + +#define skip_if_disabled() \ + do \ + { \ + snat_main_t *sm = &snat_main; \ + if (PREDICT_FALSE (!sm->enabled)) \ + return; \ + } \ + while (0) + +#define fail_if_enabled() \ + do \ + { \ + snat_main_t *sm = &snat_main; \ + if (PREDICT_FALSE (sm->enabled)) \ + { \ + nat_log_err ("plugin enabled"); \ + return 1; \ + } \ + } \ + while (0) + +#define fail_if_disabled() \ + do \ + { \ + snat_main_t *sm = &snat_main; \ + if (PREDICT_FALSE (!sm->enabled)) \ + { \ + nat_log_err ("plugin disabled"); \ + return 1; \ + } \ + } \ + while (0) + +/* *INDENT-OFF* */ +/* Hook up input features */ +VNET_FEATURE_INIT (nat_pre_in2out, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat-pre-in2out", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", + "ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (nat_pre_out2in, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat-pre-out2in", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", + "ip4-dhcp-client-detect", + "ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (snat_in2out_worker_handoff, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-in2out-worker-handoff", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), +}; +VNET_FEATURE_INIT (snat_out2in_worker_handoff, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-out2in-worker-handoff", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", + "ip4-dhcp-client-detect"), +}; +VNET_FEATURE_INIT (ip4_snat_in2out, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-in2out", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (ip4_snat_out2in, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-out2in", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature", + "ip4-dhcp-client-detect"), +}; +VNET_FEATURE_INIT (ip4_nat44_ed_in2out, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-ed-in2out", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (ip4_nat44_ed_out2in, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-ed-out2in", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature", + "ip4-dhcp-client-detect"), +}; +VNET_FEATURE_INIT (ip4_nat44_ed_classify, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-ed-classify", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (ip4_nat_handoff_classify, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-handoff-classify", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (ip4_snat_in2out_fast, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-in2out-fast", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature"), +}; +VNET_FEATURE_INIT (ip4_snat_out2in_fast, static) = { + .arc_name = "ip4-unicast", + .node_name = "nat44-out2in-fast", + .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa","ip4-sv-reassembly-feature", + "ip4-dhcp-client-detect"), +}; + +/* Hook up output features */ +VNET_FEATURE_INIT (ip4_snat_in2out_output, static) = { + .arc_name = "ip4-output", + .node_name = "nat44-in2out-output", + .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa","ip4-sv-reassembly-output-feature"), +}; +VNET_FEATURE_INIT (ip4_snat_in2out_output_worker_handoff, static) = { + .arc_name = "ip4-output", + .node_name = "nat44-in2out-output-worker-handoff", + .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa","ip4-sv-reassembly-output-feature"), +}; +VNET_FEATURE_INIT (nat_pre_in2out_output, static) = { + .arc_name = "ip4-output", + .node_name = "nat-pre-in2out-output", + .runs_after = VNET_FEATURES ("ip4-sv-reassembly-output-feature"), + .runs_before = VNET_FEATURES ("acl-plugin-out-ip4-fa"), +}; +VNET_FEATURE_INIT (ip4_nat44_ed_in2out_output, static) = { + .arc_name = "ip4-output", + .node_name = "nat44-ed-in2out-output", + .runs_after = VNET_FEATURES ("ip4-sv-reassembly-output-feature"), + .runs_before = VNET_FEATURES ("acl-plugin-out-ip4-fa"), +}; + +VLIB_PLUGIN_REGISTER () = { + .version = VPP_BUILD_VER, + .description = "Network Address Translation (NAT)", +}; +/* *INDENT-ON* */ + +static void nat44_ed_db_init (u32 translations, u32 translation_buckets); + +static void nat44_ed_db_free (); + +static u32 +nat44_ed_get_worker_out2in_cb (vlib_buffer_t * b, ip4_header_t * ip, + u32 rx_fib_index, u8 is_output); + +static u32 +nat44_ed_get_worker_in2out_cb (ip4_header_t * ip, u32 rx_fib_index, + u8 is_output); + +u32 nat_calc_bihash_buckets (u32 n_elts); + +u8 * +format_session_kvp (u8 * s, va_list * args) +{ + clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *); + + s = format (s, "%U thread-index %llu session-index %llu", format_snat_key, + v->key, nat_value_get_thread_index (v), + nat_value_get_session_index (v)); + + return s; +} + +u8 * +format_static_mapping_kvp (u8 * s, va_list * args) +{ + clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *); + + s = format (s, "%U static-mapping-index %llu", + format_snat_key, v->key, v->value); + + return s; +} + +u8 * +format_ed_session_kvp (u8 * s, va_list * args) +{ + clib_bihash_kv_16_8_t *v = va_arg (*args, clib_bihash_kv_16_8_t *); + + u8 proto; + u16 r_port, l_port; + ip4_address_t l_addr, r_addr; + u32 fib_index; + + split_ed_kv (v, &l_addr, &r_addr, &proto, &fib_index, &l_port, &r_port); + s = format (s, + "local %U:%d remote %U:%d proto %U fib %d thread-index %u " + "session-index %u", + format_ip4_address, &l_addr, clib_net_to_host_u16 (l_port), + format_ip4_address, &r_addr, clib_net_to_host_u16 (r_port), + format_ip_protocol, proto, fib_index, + ed_value_get_thread_index (v), ed_value_get_session_index (v)); + + return s; +} + +void +nat_free_session_data (snat_main_t * sm, snat_session_t * s, u32 thread_index, + u8 is_ha) +{ + per_vrf_sessions_unregister_session (s, thread_index); + + if (nat_ed_ses_i2o_flow_hash_add_del (sm, thread_index, s, 0)) + nat_elog_warn (sm, "flow hash del failed"); + + if (nat_ed_ses_o2i_flow_hash_add_del (sm, thread_index, s, 0)) + nat_elog_warn (sm, "flow hash del failed"); + + if (is_fwd_bypass_session (s)) + { + return; + } + + if (is_affinity_sessions (s)) + nat_affinity_unlock (s->ext_host_addr, s->out2in.addr, + s->nat_proto, s->out2in.port); + + if (!is_ha) + nat_syslog_nat44_sdel ( + 0, s->in2out.fib_index, &s->in2out.addr, s->in2out.port, + &s->ext_host_nat_addr, s->ext_host_nat_port, &s->out2in.addr, + s->out2in.port, &s->ext_host_addr, s->ext_host_port, s->nat_proto, + is_twice_nat_session (s)); + + if (snat_is_unk_proto_session (s)) + return; + + if (!is_ha) + { + /* log NAT event */ + nat_ipfix_logging_nat44_ses_delete (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); + } + + /* Twice NAT address and port for external host */ + if (is_twice_nat_session (s)) + { + snat_free_outside_address_and_port (sm->twice_nat_addresses, + thread_index, + &s->ext_host_nat_addr, + s->ext_host_nat_port, s->nat_proto); + } + + if (snat_is_session_static (s)) + return; + + snat_free_outside_address_and_port (sm->addresses, thread_index, + &s->out2in.addr, s->out2in.port, + s->nat_proto); +} + +void +snat_add_del_addr_to_fib (ip4_address_t * addr, u8 p_len, u32 sw_if_index, + int is_add) +{ + snat_main_t *sm = &snat_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, + sm->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, sm->fib_src_low); +} + +int +snat_add_address (snat_main_t * sm, ip4_address_t * addr, u32 vrf_id, + u8 twice_nat) +{ + snat_address_t *ap; + snat_interface_t *i; + vlib_thread_main_t *tm = vlib_get_thread_main (); + + /* Check if address already exists */ + /* *INDENT-OFF* */ + vec_foreach (ap, twice_nat ? sm->twice_nat_addresses : sm->addresses) + { + if (ap->addr.as_u32 == addr->as_u32) + { + nat_log_err ("address exist"); + return VNET_API_ERROR_VALUE_EXIST; + } + } + /* *INDENT-ON* */ + + if (twice_nat) + vec_add2 (sm->twice_nat_addresses, ap, 1); + else + vec_add2 (sm->addresses, ap, 1); + + ap->addr = *addr; + if (vrf_id != ~0) + ap->fib_index = + fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, + sm->fib_src_low); + else + ap->fib_index = ~0; + + /* *INDENT-OFF* */ + #define _(N, i, n, s) \ + clib_memset(ap->busy_##n##_port_refcounts, 0, sizeof(ap->busy_##n##_port_refcounts));\ + ap->busy_##n##_ports = 0; \ + ap->busy_##n##_ports_per_thread = 0;\ + vec_validate_init_empty (ap->busy_##n##_ports_per_thread, tm->n_vlib_mains - 1, 0); + foreach_nat_protocol + #undef _ + /* *INDENT-ON* */ + + if (twice_nat) + return 0; + + /* Add external address to FIB */ + /* *INDENT-OFF* */ + pool_foreach (i, sm->interfaces) + { + if (nat_interface_is_inside (i)) + continue; + + snat_add_del_addr_to_fib (addr, 32, i->sw_if_index, 1); + break; + } + pool_foreach (i, sm->output_feature_interfaces) + { + if (nat_interface_is_inside (i)) + continue; + + snat_add_del_addr_to_fib (addr, 32, i->sw_if_index, 1); + break; + } + /* *INDENT-ON* */ + + return 0; +} + +static int +is_snat_address_used_in_static_mapping (snat_main_t * sm, ip4_address_t addr) +{ + snat_static_mapping_t *m; + /* *INDENT-OFF* */ + pool_foreach (m, sm->static_mappings) + { + if (is_addr_only_static_mapping (m) || + is_out2in_only_static_mapping (m) || + is_identity_static_mapping (m)) + continue; + if (m->external_addr.as_u32 == addr.as_u32) + return 1; + } + /* *INDENT-ON* */ + + return 0; +} + +static void +snat_add_static_mapping_when_resolved (snat_main_t *sm, ip4_address_t l_addr, + u16 l_port, u32 sw_if_index, u16 e_port, + u32 vrf_id, nat_protocol_t proto, + int addr_only, u8 *tag, int twice_nat, + int out2in_only, int identity_nat, + ip4_address_t pool_addr, int exact) +{ + snat_static_map_resolve_t *rp; + + vec_add2 (sm->to_resolve, rp, 1); + rp->l_addr.as_u32 = l_addr.as_u32; + rp->l_port = l_port; + rp->sw_if_index = sw_if_index; + rp->e_port = e_port; + rp->vrf_id = vrf_id; + rp->proto = proto; + rp->addr_only = addr_only; + rp->twice_nat = twice_nat; + rp->out2in_only = out2in_only; + rp->identity_nat = identity_nat; + rp->tag = vec_dup (tag); + rp->pool_addr = pool_addr; + rp->exact = exact; +} + +u32 +get_thread_idx_by_port (u16 e_port) +{ + snat_main_t *sm = &snat_main; + u32 thread_idx = sm->num_workers; + if (sm->num_workers > 1) + { + thread_idx = + sm->first_worker_index + + sm->workers[(e_port - 1024) / sm->port_per_thread]; + } + return thread_idx; +} + +void +nat_ed_static_mapping_del_sessions (snat_main_t * sm, + snat_main_per_thread_data_t * tsm, + ip4_address_t l_addr, + u16 l_port, + u8 protocol, + u32 fib_index, int addr_only, + ip4_address_t e_addr, u16 e_port) +{ + snat_session_t *s; + u32 *indexes_to_free = NULL; + /* *INDENT-OFF* */ + pool_foreach (s, tsm->sessions) { + if (s->in2out.fib_index != fib_index || + s->in2out.addr.as_u32 != l_addr.as_u32) + { + continue; + } + if (!addr_only) + { + if ((s->out2in.addr.as_u32 != e_addr.as_u32) || + s->out2in.port != e_port || + s->in2out.port != l_port || + s->nat_proto != protocol) + continue; + } + + if (is_lb_session (s)) + continue; + if (!snat_is_session_static (s)) + continue; + nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); + vec_add1 (indexes_to_free, s - tsm->sessions); + if (!addr_only) + break; + } + /* *INDENT-ON* */ + u32 *ses_index; + vec_foreach (ses_index, indexes_to_free) + { + s = pool_elt_at_index (tsm->sessions, *ses_index); + nat_ed_session_delete (sm, s, tsm - sm->per_thread_data, 1); + } + vec_free (indexes_to_free); +} + +int +snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr, + u16 l_port, u16 e_port, u32 vrf_id, int addr_only, + u32 sw_if_index, nat_protocol_t proto, int is_add, + twice_nat_type_t twice_nat, u8 out2in_only, u8 *tag, + u8 identity_nat, ip4_address_t pool_addr, int exact) +{ + snat_main_t *sm = &snat_main; + snat_static_mapping_t *m; + clib_bihash_kv_8_8_t kv, value; + snat_address_t *a = 0; + u32 fib_index = ~0; + snat_interface_t *interface; + snat_main_per_thread_data_t *tsm; + snat_static_map_resolve_t *rp, *rp_match = 0; + nat44_lb_addr_port_t *local; + u32 find = ~0; + int i; + + /* If the external address is a specific interface address */ + if (sw_if_index != ~0) + { + ip4_address_t *first_int_addr; + + for (i = 0; i < vec_len (sm->to_resolve); i++) + { + rp = sm->to_resolve + i; + if (rp->sw_if_index != sw_if_index || + rp->l_addr.as_u32 != l_addr.as_u32 || + rp->vrf_id != vrf_id || rp->addr_only != addr_only) + continue; + + if (!addr_only) + { + if ((rp->l_port != l_port && rp->e_port != e_port) + || rp->proto != proto) + continue; + } + + rp_match = rp; + break; + } + + /* Might be already set... */ + first_int_addr = ip4_interface_first_address + (sm->ip4_main, sw_if_index, 0 /* just want the address */ ); + + if (is_add) + { + if (rp_match) + return VNET_API_ERROR_VALUE_EXIST; + + snat_add_static_mapping_when_resolved ( + sm, l_addr, l_port, sw_if_index, e_port, vrf_id, proto, addr_only, + tag, twice_nat, out2in_only, identity_nat, pool_addr, exact); + + /* DHCP resolution required? */ + if (first_int_addr == 0) + { + return 0; + } + else + { + e_addr.as_u32 = first_int_addr->as_u32; + /* Identity mapping? */ + if (l_addr.as_u32 == 0) + l_addr.as_u32 = e_addr.as_u32; + } + } + else + { + if (!rp_match) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + vec_del1 (sm->to_resolve, i); + + if (first_int_addr) + { + e_addr.as_u32 = first_int_addr->as_u32; + /* Identity mapping? */ + if (l_addr.as_u32 == 0) + l_addr.as_u32 = e_addr.as_u32; + } + else + return 0; + } + } + + init_nat_k (&kv, e_addr, addr_only ? 0 : e_port, 0, addr_only ? 0 : proto); + if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) + m = 0; + else + m = pool_elt_at_index (sm->static_mappings, value.value); + + if (is_add) + { + if (m) + { + if (is_identity_static_mapping (m)) + { + /* *INDENT-OFF* */ + pool_foreach (local, m->locals) + { + if (local->vrf_id == vrf_id) + return VNET_API_ERROR_VALUE_EXIST; + } + /* *INDENT-ON* */ + pool_get (m->locals, local); + local->vrf_id = vrf_id; + local->fib_index = + fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, + sm->fib_src_low); + init_nat_kv (&kv, m->local_addr, m->local_port, local->fib_index, + m->proto, 0, m - sm->static_mappings); + clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1); + return 0; + } + else + return VNET_API_ERROR_VALUE_EXIST; + } + + if (twice_nat && addr_only) + return VNET_API_ERROR_UNSUPPORTED; + + /* Convert VRF id to FIB index */ + if (vrf_id != ~0) + fib_index = + fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, + sm->fib_src_low); + /* If not specified use inside VRF id from SNAT plugin startup config */ + else + { + fib_index = sm->inside_fib_index; + vrf_id = sm->inside_vrf_id; + fib_table_lock (fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low); + } + + if (!(out2in_only || identity_nat)) + { + init_nat_k (&kv, l_addr, addr_only ? 0 : l_port, fib_index, + addr_only ? 0 : proto); + if (!clib_bihash_search_8_8 + (&sm->static_mapping_by_local, &kv, &value)) + return VNET_API_ERROR_VALUE_EXIST; + } + + /* Find external address in allocated addresses and reserve port for + address and port pair mapping when dynamic translations enabled */ + if (!(addr_only || sm->static_mapping_only || out2in_only)) + { + for (i = 0; i < vec_len (sm->addresses); i++) + { + if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) + { + a = sm->addresses + i; + /* External port must be unused */ + switch (proto) + { +#define _(N, j, n, s) \ + case NAT_PROTOCOL_##N: \ + if (a->busy_##n##_port_refcounts[e_port]) \ + return VNET_API_ERROR_INVALID_VALUE; \ + ++a->busy_##n##_port_refcounts[e_port]; \ + if (e_port > 1024) \ + { \ + a->busy_##n##_ports++; \ + a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \ + } \ + break; + foreach_nat_protocol +#undef _ + default : nat_elog_info (sm, "unknown protocol"); + return VNET_API_ERROR_INVALID_VALUE_2; + } + break; + } + } + /* External address must be allocated */ + if (!a && (l_addr.as_u32 != e_addr.as_u32)) + { + if (sw_if_index != ~0) + { + for (i = 0; i < vec_len (sm->to_resolve); i++) + { + rp = sm->to_resolve + i; + if (rp->addr_only) + continue; + if (rp->sw_if_index != sw_if_index && + rp->l_addr.as_u32 != l_addr.as_u32 && + rp->vrf_id != vrf_id && rp->l_port != l_port && + rp->e_port != e_port && rp->proto != proto) + continue; + + vec_del1 (sm->to_resolve, i); + break; + } + } + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + } + + pool_get (sm->static_mappings, m); + clib_memset (m, 0, sizeof (*m)); + m->tag = vec_dup (tag); + m->local_addr = l_addr; + m->external_addr = e_addr; + m->twice_nat = twice_nat; + + if (twice_nat == TWICE_NAT && exact) + { + m->flags |= NAT_STATIC_MAPPING_FLAG_EXACT_ADDRESS; + m->pool_addr = pool_addr; + } + + if (out2in_only) + m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY; + if (addr_only) + m->flags |= NAT_STATIC_MAPPING_FLAG_ADDR_ONLY; + if (identity_nat) + { + m->flags |= NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT; + pool_get (m->locals, local); + local->vrf_id = vrf_id; + local->fib_index = fib_index; + } + else + { + m->vrf_id = vrf_id; + m->fib_index = fib_index; + } + if (!addr_only) + { + m->local_port = l_port; + m->external_port = e_port; + m->proto = proto; + } + + if (sm->num_workers > 1) + { + ip4_header_t ip = { + .src_address = m->local_addr, + }; + vec_add1 (m->workers, sm->worker_in2out_cb (&ip, m->fib_index, 0)); + tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]); + } + else + tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); + + if (!out2in_only) + { + init_nat_kv (&kv, m->local_addr, m->local_port, fib_index, m->proto, + 0, m - sm->static_mappings); + clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1); + } + + init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0, + m - sm->static_mappings); + clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1); + } + else + { + if (!m) + { + if (sw_if_index != ~0) + return 0; + else + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + + if (identity_nat) + { + if (vrf_id == ~0) + vrf_id = sm->inside_vrf_id; + + /* *INDENT-OFF* */ + pool_foreach (local, m->locals) + { + if (local->vrf_id == vrf_id) + find = local - m->locals; + } + /* *INDENT-ON* */ + if (find == ~0) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + local = pool_elt_at_index (m->locals, find); + fib_index = local->fib_index; + pool_put (m->locals, local); + } + else + fib_index = m->fib_index; + + /* Free external address port */ + if (!(addr_only || sm->static_mapping_only || out2in_only)) + { + for (i = 0; i < vec_len (sm->addresses); i++) + { + if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) + { + a = sm->addresses + i; + switch (proto) + { +#define _(N, j, n, s) \ + case NAT_PROTOCOL_##N: \ + --a->busy_##n##_port_refcounts[e_port]; \ + if (e_port > 1024) \ + { \ + a->busy_##n##_ports--; \ + a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \ + } \ + break; + foreach_nat_protocol +#undef _ + default : nat_elog_info (sm, "unknown protocol"); + return VNET_API_ERROR_INVALID_VALUE_2; + } + break; + } + } + } + + if (sm->num_workers > 1) + tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]); + else + tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); + + init_nat_k (&kv, m->local_addr, m->local_port, fib_index, m->proto); + if (!out2in_only) + clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0); + + /* Delete session(s) for static mapping if exist */ + if (!(sm->static_mapping_only) || + (sm->static_mapping_only && sm->static_mapping_connection_tracking)) + { + nat_ed_static_mapping_del_sessions ( + sm, tsm, m->local_addr, m->local_port, m->proto, fib_index, + addr_only, e_addr, e_port); + } + + fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low); + if (pool_elts (m->locals)) + return 0; + + init_nat_k (&kv, m->external_addr, m->external_port, 0, m->proto); + clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0); + + vec_free (m->tag); + vec_free (m->workers); + /* Delete static mapping from pool */ + pool_put (sm->static_mappings, m); + } + + if (!addr_only || (l_addr.as_u32 == e_addr.as_u32)) + return 0; + + /* Add/delete external address to FIB */ + /* *INDENT-OFF* */ + pool_foreach (interface, sm->interfaces) + { + if (nat_interface_is_inside (interface)) + continue; + + snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, is_add); + break; + } + pool_foreach (interface, sm->output_feature_interfaces) + { + if (nat_interface_is_inside (interface)) + continue; + + snat_add_del_addr_to_fib (&e_addr, 32, interface->sw_if_index, is_add); + break; + } + /* *INDENT-ON* */ + + return 0; +} + +int +nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port, + nat_protocol_t proto, + nat44_lb_addr_port_t * locals, u8 is_add, + twice_nat_type_t twice_nat, u8 out2in_only, + u8 * tag, u32 affinity) +{ + snat_main_t *sm = &snat_main; + snat_static_mapping_t *m; + clib_bihash_kv_8_8_t kv, value; + snat_address_t *a = 0; + int i; + nat44_lb_addr_port_t *local; + snat_main_per_thread_data_t *tsm; + snat_session_t *s; + uword *bitmap = 0; + + init_nat_k (&kv, e_addr, e_port, 0, proto); + if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) + m = 0; + else + m = pool_elt_at_index (sm->static_mappings, value.value); + + if (is_add) + { + if (m) + return VNET_API_ERROR_VALUE_EXIST; + + if (vec_len (locals) < 2) + return VNET_API_ERROR_INVALID_VALUE; + + /* Find external address in allocated addresses and reserve port for + address and port pair mapping when dynamic translations enabled */ + if (!(sm->static_mapping_only || out2in_only)) + { + for (i = 0; i < vec_len (sm->addresses); i++) + { + if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) + { + a = sm->addresses + i; + /* External port must be unused */ + switch (proto) + { +#define _(N, j, n, s) \ + case NAT_PROTOCOL_##N: \ + if (a->busy_##n##_port_refcounts[e_port]) \ + return VNET_API_ERROR_INVALID_VALUE; \ + ++a->busy_##n##_port_refcounts[e_port]; \ + if (e_port > 1024) \ + { \ + a->busy_##n##_ports++; \ + a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \ + } \ + break; + foreach_nat_protocol +#undef _ + default : nat_elog_info (sm, "unknown protocol"); + return VNET_API_ERROR_INVALID_VALUE_2; + } + break; + } + } + /* External address must be allocated */ + if (!a) + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + + pool_get (sm->static_mappings, m); + clib_memset (m, 0, sizeof (*m)); + m->tag = vec_dup (tag); + m->external_addr = e_addr; + m->external_port = e_port; + m->proto = proto; + m->twice_nat = twice_nat; + m->flags |= NAT_STATIC_MAPPING_FLAG_LB; + if (out2in_only) + m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY; + m->affinity = affinity; + + if (affinity) + m->affinity_per_service_list_head_index = + nat_affinity_get_per_service_list_head_index (); + else + m->affinity_per_service_list_head_index = ~0; + + init_nat_kv (&kv, m->external_addr, m->external_port, 0, m->proto, 0, + m - sm->static_mappings); + if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1)) + { + nat_elog_err (sm, "static_mapping_by_external key add failed"); + return VNET_API_ERROR_UNSPECIFIED; + } + + for (i = 0; i < vec_len (locals); i++) + { + locals[i].fib_index = + fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, + locals[i].vrf_id, + sm->fib_src_low); + if (!out2in_only) + { + init_nat_kv (&kv, locals[i].addr, locals[i].port, + locals[i].fib_index, m->proto, 0, + m - sm->static_mappings); + clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1); + } + locals[i].prefix = (i == 0) ? locals[i].probability : + (locals[i - 1].prefix + locals[i].probability); + pool_get (m->locals, local); + *local = locals[i]; + if (sm->num_workers > 1) + { + ip4_header_t ip = { + .src_address = locals[i].addr, + }; + bitmap = + clib_bitmap_set (bitmap, + sm->worker_in2out_cb (&ip, m->fib_index, 0), + 1); + } + } + + /* Assign workers */ + if (sm->num_workers > 1) + { + /* *INDENT-OFF* */ + clib_bitmap_foreach (i, bitmap) + { + vec_add1(m->workers, i); + } + /* *INDENT-ON* */ + } + } + else + { + if (!m) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + if (!is_lb_static_mapping (m)) + return VNET_API_ERROR_INVALID_VALUE; + + /* Free external address port */ + if (!(sm->static_mapping_only || out2in_only)) + { + for (i = 0; i < vec_len (sm->addresses); i++) + { + if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) + { + a = sm->addresses + i; + switch (proto) + { +#define _(N, j, n, s) \ + case NAT_PROTOCOL_##N: \ + --a->busy_##n##_port_refcounts[e_port]; \ + if (e_port > 1024) \ + { \ + a->busy_##n##_ports--; \ + a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \ + } \ + break; + foreach_nat_protocol +#undef _ + default : nat_elog_info (sm, "unknown protocol"); + return VNET_API_ERROR_INVALID_VALUE_2; + } + break; + } + } + } + + init_nat_k (&kv, m->external_addr, m->external_port, 0, m->proto); + if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0)) + { + nat_elog_err (sm, "static_mapping_by_external key del failed"); + return VNET_API_ERROR_UNSPECIFIED; + } + + /* *INDENT-OFF* */ + pool_foreach (local, m->locals) + { + fib_table_unlock (local->fib_index, FIB_PROTOCOL_IP4, + sm->fib_src_low); + if (!out2in_only) + { +init_nat_k(& kv, local->addr, local->port, local->fib_index, m->proto); + if (clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0)) + { + nat_elog_err (sm, "static_mapping_by_local key del failed"); + return VNET_API_ERROR_UNSPECIFIED; + } + } + + if (sm->num_workers > 1) + { + ip4_header_t ip = { + .src_address = local->addr, + }; + tsm = + vec_elt_at_index (sm->per_thread_data, + sm->worker_in2out_cb (&ip, m->fib_index, 0)); + } + else + tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); + + /* Delete sessions */ + pool_foreach (s, tsm->sessions) + { + if (!(is_lb_session (s))) + continue; + + if ((s->in2out.addr.as_u32 != local->addr.as_u32) || + s->in2out.port != local->port) + continue; + + nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); + nat_ed_session_delete (sm, s, tsm - sm->per_thread_data, 1); + } + } + /* *INDENT-ON* */ + if (m->affinity) + nat_affinity_flush_service (m->affinity_per_service_list_head_index); + pool_free (m->locals); + vec_free (m->tag); + vec_free (m->workers); + + pool_put (sm->static_mappings, m); + } + + return 0; +} + +int +nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port, + ip4_address_t l_addr, u16 l_port, + nat_protocol_t proto, u32 vrf_id, + u8 probability, u8 is_add) +{ + snat_main_t *sm = &snat_main; + snat_static_mapping_t *m = 0; + clib_bihash_kv_8_8_t kv, value; + nat44_lb_addr_port_t *local, *prev_local, *match_local = 0; + snat_main_per_thread_data_t *tsm; + snat_session_t *s; + u32 *locals = 0; + uword *bitmap = 0; + int i; + + init_nat_k (&kv, e_addr, e_port, 0, proto); + if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) + m = pool_elt_at_index (sm->static_mappings, value.value); + + if (!m) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + if (!is_lb_static_mapping (m)) + return VNET_API_ERROR_INVALID_VALUE; + + /* *INDENT-OFF* */ + pool_foreach (local, m->locals) + { + if ((local->addr.as_u32 == l_addr.as_u32) && (local->port == l_port) && + (local->vrf_id == vrf_id)) + { + match_local = local; + break; + } + } + /* *INDENT-ON* */ + + if (is_add) + { + if (match_local) + return VNET_API_ERROR_VALUE_EXIST; + + pool_get (m->locals, local); + clib_memset (local, 0, sizeof (*local)); + local->addr.as_u32 = l_addr.as_u32; + local->port = l_port; + local->probability = probability; + local->vrf_id = vrf_id; + local->fib_index = + fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, + sm->fib_src_low); + + if (!is_out2in_only_static_mapping (m)) + { + init_nat_kv (&kv, l_addr, l_port, local->fib_index, proto, 0, + m - sm->static_mappings); + if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1)) + nat_elog_err (sm, "static_mapping_by_local key add failed"); + } + } + else + { + if (!match_local) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + if (pool_elts (m->locals) < 3) + return VNET_API_ERROR_UNSPECIFIED; + + fib_table_unlock (match_local->fib_index, FIB_PROTOCOL_IP4, + sm->fib_src_low); + + if (!is_out2in_only_static_mapping (m)) + { + init_nat_k (&kv, l_addr, l_port, match_local->fib_index, proto); + if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0)) + nat_elog_err (sm, "static_mapping_by_local key del failed"); + } + + if (sm->num_workers > 1) + { + ip4_header_t ip = { + .src_address = local->addr, + }; + tsm = vec_elt_at_index (sm->per_thread_data, + sm->worker_in2out_cb (&ip, m->fib_index, + 0)); + } + else + tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); + + /* Delete sessions */ + /* *INDENT-OFF* */ + pool_foreach (s, tsm->sessions) { + if (!(is_lb_session (s))) + continue; + + if ((s->in2out.addr.as_u32 != match_local->addr.as_u32) || + s->in2out.port != match_local->port) + continue; + + nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); + nat_ed_session_delete (sm, s, tsm - sm->per_thread_data, 1); + } + /* *INDENT-ON* */ + + pool_put (m->locals, match_local); + } + + vec_free (m->workers); + + /* *INDENT-OFF* */ + pool_foreach (local, m->locals) + { + vec_add1 (locals, local - m->locals); + if (sm->num_workers > 1) + { + ip4_header_t ip; + ip.src_address.as_u32 = local->addr.as_u32, + bitmap = clib_bitmap_set (bitmap, + sm->worker_in2out_cb (&ip, local->fib_index, 0), + 1); + } + } + /* *INDENT-ON* */ + + ASSERT (vec_len (locals) > 1); + + local = pool_elt_at_index (m->locals, locals[0]); + local->prefix = local->probability; + for (i = 1; i < vec_len (locals); i++) + { + local = pool_elt_at_index (m->locals, locals[i]); + prev_local = pool_elt_at_index (m->locals, locals[i - 1]); + local->prefix = local->probability + prev_local->prefix; + } + + /* Assign workers */ + if (sm->num_workers > 1) + { + /* *INDENT-OFF* */ + clib_bitmap_foreach (i, bitmap) { vec_add1(m->workers, i); } + /* *INDENT-ON* */ + } + + return 0; +} + +int +snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm, + u8 twice_nat) +{ + snat_address_t *a = 0; + snat_session_t *ses; + u32 *ses_to_be_removed = 0, *ses_index; + snat_main_per_thread_data_t *tsm; + snat_static_mapping_t *m; + snat_interface_t *interface; + int i; + snat_address_t *addresses = + twice_nat ? sm->twice_nat_addresses : sm->addresses; + + /* Find SNAT address */ + for (i = 0; i < vec_len (addresses); i++) + { + if (addresses[i].addr.as_u32 == addr.as_u32) + { + a = addresses + i; + break; + } + } + if (!a) + { + nat_log_err ("no such address"); + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + + if (delete_sm) + { + ip4_address_t pool_addr = { 0 }; + /* *INDENT-OFF* */ + pool_foreach (m, sm->static_mappings) + { + if (m->external_addr.as_u32 == addr.as_u32) + (void) snat_add_static_mapping (m->local_addr, m->external_addr, + m->local_port, m->external_port, + m->vrf_id, + is_addr_only_static_mapping(m), ~0, + m->proto, 0 /* is_add */, + m->twice_nat, + is_out2in_only_static_mapping(m), + m->tag, + is_identity_static_mapping(m), + pool_addr, 0); + } + /* *INDENT-ON* */ + } + else + { + /* Check if address is used in some static mapping */ + if (is_snat_address_used_in_static_mapping (sm, addr)) + { + nat_log_err ("address used in static mapping"); + return VNET_API_ERROR_UNSPECIFIED; + } + } + + if (a->fib_index != ~0) + fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP4, sm->fib_src_low); + + /* Delete sessions using address */ + if (a->busy_tcp_ports || a->busy_udp_ports || a->busy_icmp_ports) + { + vec_foreach (tsm, sm->per_thread_data) + { + pool_foreach (ses, tsm->sessions) { + if (ses->out2in.addr.as_u32 == addr.as_u32) + { + nat_free_session_data (sm, ses, tsm - sm->per_thread_data, 0); + vec_add1 (ses_to_be_removed, ses - tsm->sessions); + } + } + + vec_foreach (ses_index, ses_to_be_removed) + { + ses = pool_elt_at_index (tsm->sessions, ses_index[0]); + nat_ed_session_delete (sm, ses, tsm - sm->per_thread_data, 1); + } + + vec_free (ses_to_be_removed); + } + } + +#define _(N, i, n, s) \ + vec_free (a->busy_##n##_ports_per_thread); + foreach_nat_protocol +#undef _ + + if (twice_nat) + { + vec_del1 (sm->twice_nat_addresses, i); + return 0; + } + else vec_del1 (sm->addresses, i); + + /* Delete external address from FIB */ + pool_foreach (interface, sm->interfaces) + { + if (nat_interface_is_inside (interface)) + continue; + + snat_add_del_addr_to_fib (&addr, 32, interface->sw_if_index, 0); + break; + } + pool_foreach (interface, sm->output_feature_interfaces) + { + if (nat_interface_is_inside (interface)) + continue; + + snat_add_del_addr_to_fib (&addr, 32, interface->sw_if_index, 0); + break; + } + + return 0; +} + +void +expire_per_vrf_sessions (u32 fib_index) +{ + per_vrf_sessions_t *per_vrf_sessions; + snat_main_per_thread_data_t *tsm; + snat_main_t *sm = &snat_main; + + /* *INDENT-OFF* */ + vec_foreach (tsm, sm->per_thread_data) + { + vec_foreach (per_vrf_sessions, tsm->per_vrf_sessions_vec) + { + if ((per_vrf_sessions->rx_fib_index == fib_index) || + (per_vrf_sessions->tx_fib_index == fib_index)) + { + per_vrf_sessions->expired = 1; + } + } + } + /* *INDENT-ON* */ +} + +void +update_per_vrf_sessions_vec (u32 fib_index, int is_del) +{ + snat_main_t *sm = &snat_main; + nat_fib_t *fib; + + // we don't care if it is outside/inside fib + // we just care about their ref_count + // if it reaches 0 sessions should expire + // because the fib isn't valid for NAT anymore + + vec_foreach (fib, sm->fibs) + { + if (fib->fib_index == fib_index) + { + if (is_del) + { + fib->ref_count--; + if (!fib->ref_count) + { + vec_del1 (sm->fibs, fib - sm->fibs); + expire_per_vrf_sessions (fib_index); + } + return; + } + else + fib->ref_count++; + } + } + if (!is_del) + { + vec_add2 (sm->fibs, fib, 1); + fib->ref_count = 1; + fib->fib_index = fib_index; + } +} + +int +snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del) +{ + snat_main_t *sm = &snat_main; + snat_interface_t *i; + const char *feature_name, *del_feature_name; + snat_address_t *ap; + snat_static_mapping_t *m; + nat_outside_fib_t *outside_fib; + u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + sw_if_index); + + if (!sm->enabled) + { + nat_log_err ("nat44 is disabled"); + return VNET_API_ERROR_UNSUPPORTED; + } + + /* *INDENT-OFF* */ + pool_foreach (i, sm->output_feature_interfaces) + { + if (i->sw_if_index == sw_if_index) + { + nat_log_err ("error interface already configured"); + return VNET_API_ERROR_VALUE_EXIST; + } + } + /* *INDENT-ON* */ + + if (sm->static_mapping_only && !(sm->static_mapping_connection_tracking)) + feature_name = is_inside ? "nat44-in2out-fast" : "nat44-out2in-fast"; + else + { + if (sm->num_workers > 1) + feature_name = + is_inside ? "nat44-in2out-worker-handoff" : + "nat44-out2in-worker-handoff"; + else + feature_name = is_inside ? "nat-pre-in2out" : "nat-pre-out2in"; + } + + ASSERT (sm->frame_queue_nelts > 0); + + if (sm->fq_in2out_index == ~0 && sm->num_workers > 1) + sm->fq_in2out_index = vlib_frame_queue_main_init (sm->in2out_node_index, + sm->frame_queue_nelts); + + if (sm->fq_out2in_index == ~0 && sm->num_workers > 1) + sm->fq_out2in_index = vlib_frame_queue_main_init (sm->out2in_node_index, + sm->frame_queue_nelts); + + update_per_vrf_sessions_vec (fib_index, is_del); + + if (!is_inside) + { + /* *INDENT-OFF* */ + vec_foreach (outside_fib, sm->outside_fibs) + { + if (outside_fib->fib_index == fib_index) + { + if (is_del) + { + outside_fib->refcount--; + if (!outside_fib->refcount) + vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs); + } + else + outside_fib->refcount++; + goto feature_set; + } + } + /* *INDENT-ON* */ + if (!is_del) + { + vec_add2 (sm->outside_fibs, outside_fib, 1); + outside_fib->refcount = 1; + outside_fib->fib_index = fib_index; + } + } + +feature_set: + /* *INDENT-OFF* */ + pool_foreach (i, sm->interfaces) + { + if (i->sw_if_index == sw_if_index) + { + if (is_del) + { + if (nat_interface_is_inside(i) && nat_interface_is_outside(i)) + { + if (is_inside) + i->flags &= ~NAT_INTERFACE_FLAG_IS_INSIDE; + else + i->flags &= ~NAT_INTERFACE_FLAG_IS_OUTSIDE; + + if (sm->num_workers > 1) + { + del_feature_name = "nat44-handoff-classify"; + feature_name = !is_inside ? "nat44-in2out-worker-handoff" : + "nat44-out2in-worker-handoff"; + } + else + { + del_feature_name = "nat44-ed-classify"; + feature_name = + !is_inside ? "nat-pre-in2out" : "nat-pre-out2in"; + } + + int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 0); + if (rv) + return rv; + vnet_feature_enable_disable ("ip4-unicast", del_feature_name, + sw_if_index, 0, 0, 0); + vnet_feature_enable_disable ("ip4-unicast", feature_name, + sw_if_index, 1, 0, 0); + } + else + { + int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 0); + if (rv) + return rv; + vnet_feature_enable_disable ("ip4-unicast", feature_name, + sw_if_index, 0, 0, 0); + pool_put (sm->interfaces, i); + } + } + else + { + if ((nat_interface_is_inside (i) && is_inside) || + (nat_interface_is_outside (i) && !is_inside)) + return 0; + + if (sm->num_workers > 1) + { + del_feature_name = !is_inside ? "nat44-in2out-worker-handoff" : + "nat44-out2in-worker-handoff"; + feature_name = "nat44-handoff-classify"; + } + else + { + del_feature_name = + !is_inside ? "nat-pre-in2out" : "nat-pre-out2in"; + + feature_name = "nat44-ed-classify"; + } + + int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 1); + if (rv) + return rv; + vnet_feature_enable_disable ("ip4-unicast", del_feature_name, + sw_if_index, 0, 0, 0); + vnet_feature_enable_disable ("ip4-unicast", feature_name, + sw_if_index, 1, 0, 0); + goto set_flags; + } + + goto fib; + } + } + /* *INDENT-ON* */ + + if (is_del) + { + nat_log_err ("error interface couldn't be found"); + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + + pool_get (sm->interfaces, i); + i->sw_if_index = sw_if_index; + i->flags = 0; + nat_validate_interface_counters (sm, sw_if_index); + + vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 1, 0, + 0); + + int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, 1); + if (rv) + return rv; + +set_flags: + if (is_inside) + { + i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE; + return 0; + } + else + i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE; + + /* Add/delete external addresses to FIB */ +fib: + /* *INDENT-OFF* */ + vec_foreach (ap, sm->addresses) + snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del); + + pool_foreach (m, sm->static_mappings) + { + if (!(is_addr_only_static_mapping(m)) || (m->local_addr.as_u32 == m->external_addr.as_u32)) + continue; + + snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del); + } + /* *INDENT-ON* */ + + return 0; +} + +int +snat_interface_add_del_output_feature (u32 sw_if_index, + u8 is_inside, int is_del) +{ + snat_main_t *sm = &snat_main; + snat_interface_t *i; + snat_address_t *ap; + snat_static_mapping_t *m; + nat_outside_fib_t *outside_fib; + u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, + sw_if_index); + + if (!sm->enabled) + { + nat_log_err ("nat44 is disabled"); + return VNET_API_ERROR_UNSUPPORTED; + } + + if (sm->static_mapping_only && !(sm->static_mapping_connection_tracking)) + { + nat_log_err ("error unsupported"); + return VNET_API_ERROR_UNSUPPORTED; + } + + /* *INDENT-OFF* */ + pool_foreach (i, sm->interfaces) + { + if (i->sw_if_index == sw_if_index) + { + nat_log_err ("error interface already configured"); + return VNET_API_ERROR_VALUE_EXIST; + } + } + /* *INDENT-ON* */ + + update_per_vrf_sessions_vec (fib_index, is_del); + + if (!is_inside) + { + /* *INDENT-OFF* */ + vec_foreach (outside_fib, sm->outside_fibs) + { + if (outside_fib->fib_index == fib_index) + { + if (is_del) + { + outside_fib->refcount--; + if (!outside_fib->refcount) + vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs); + } + else + outside_fib->refcount++; + goto feature_set; + } + } + /* *INDENT-ON* */ + if (!is_del) + { + vec_add2 (sm->outside_fibs, outside_fib, 1); + outside_fib->refcount = 1; + outside_fib->fib_index = fib_index; + } + } + +feature_set: + if (is_inside) + { + int rv = + ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del); + if (rv) + return rv; + rv = + ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, + !is_del); + if (rv) + return rv; + goto fq; + } + + if (sm->num_workers > 1) + { + int rv = ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del); + if (rv) + return rv; + rv = + ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, !is_del); + if (rv) + return rv; + vnet_feature_enable_disable ("ip4-unicast", + "nat44-out2in-worker-handoff", + sw_if_index, !is_del, 0, 0); + vnet_feature_enable_disable ("ip4-output", + "nat44-in2out-output-worker-handoff", + sw_if_index, !is_del, 0, 0); + } + else + { + int rv = + ip4_sv_reass_enable_disable_with_refcnt (sw_if_index, !is_del); + if (rv) + return rv; + rv = + ip4_sv_reass_output_enable_disable_with_refcnt (sw_if_index, + !is_del); + if (rv) + return rv; + vnet_feature_enable_disable ("ip4-unicast", "nat-pre-out2in", + sw_if_index, !is_del, 0, 0); + vnet_feature_enable_disable ("ip4-output", "nat-pre-in2out-output", + sw_if_index, !is_del, 0, 0); + } + +fq: + if (sm->fq_in2out_output_index == ~0 && sm->num_workers > 1) + sm->fq_in2out_output_index = + vlib_frame_queue_main_init (sm->in2out_output_node_index, 0); + + if (sm->fq_out2in_index == ~0 && sm->num_workers > 1) + sm->fq_out2in_index = + vlib_frame_queue_main_init (sm->out2in_node_index, 0); + + /* *INDENT-OFF* */ + pool_foreach (i, sm->output_feature_interfaces) + { + if (i->sw_if_index == sw_if_index) + { + if (is_del) + pool_put (sm->output_feature_interfaces, i); + else + return VNET_API_ERROR_VALUE_EXIST; + + goto fib; + } + } + /* *INDENT-ON* */ + + if (is_del) + { + nat_log_err ("error interface couldn't be found"); + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + + pool_get (sm->output_feature_interfaces, i); + i->sw_if_index = sw_if_index; + i->flags = 0; + nat_validate_interface_counters (sm, sw_if_index); + if (is_inside) + i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE; + else + i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE; + + /* Add/delete external addresses to FIB */ +fib: + if (is_inside) + return 0; + + /* *INDENT-OFF* */ + vec_foreach (ap, sm->addresses) + snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del); + + pool_foreach (m, sm->static_mappings) + { + if (!((is_addr_only_static_mapping(m))) || (m->local_addr.as_u32 == m->external_addr.as_u32)) + continue; + + snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del); + } + /* *INDENT-ON* */ + + return 0; +} + +int +snat_set_workers (uword * bitmap) +{ + snat_main_t *sm = &snat_main; + int i, j = 0; + + if (sm->num_workers < 2) + return VNET_API_ERROR_FEATURE_DISABLED; + + if (clib_bitmap_last_set (bitmap) >= sm->num_workers) + return VNET_API_ERROR_INVALID_WORKER; + + vec_free (sm->workers); + /* *INDENT-OFF* */ + clib_bitmap_foreach (i, bitmap) + { + vec_add1(sm->workers, i); + sm->per_thread_data[sm->first_worker_index + i].snat_thread_index = j; + sm->per_thread_data[sm->first_worker_index + i].thread_index = i; + j++; + } + /* *INDENT-ON* */ + + sm->port_per_thread = (0xffff - 1024) / _vec_len (sm->workers); + + return 0; +} + +int +nat44_ed_set_frame_queue_nelts (u32 frame_queue_nelts) +{ + fail_if_enabled (); + snat_main_t *sm = &snat_main; + sm->frame_queue_nelts = frame_queue_nelts; + return 0; +} + +static void +snat_update_outside_fib (ip4_main_t * im, uword opaque, + u32 sw_if_index, u32 new_fib_index, + u32 old_fib_index) +{ + snat_main_t *sm = &snat_main; + nat_outside_fib_t *outside_fib; + snat_interface_t *i; + u8 is_add = 1; + u8 match = 0; + + if (!sm->enabled || (new_fib_index == old_fib_index) + || (!vec_len (sm->outside_fibs))) + { + return; + } + + /* *INDENT-OFF* */ + pool_foreach (i, sm->interfaces) + { + if (i->sw_if_index == sw_if_index) + { + if (!(nat_interface_is_outside (i))) + return; + match = 1; + } + } + + pool_foreach (i, sm->output_feature_interfaces) + { + if (i->sw_if_index == sw_if_index) + { + if (!(nat_interface_is_outside (i))) + return; + match = 1; + } + } + /* *INDENT-ON* */ + + if (!match) + return; + + vec_foreach (outside_fib, sm->outside_fibs) + { + if (outside_fib->fib_index == old_fib_index) + { + outside_fib->refcount--; + if (!outside_fib->refcount) + vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs); + break; + } + } + + vec_foreach (outside_fib, sm->outside_fibs) + { + if (outside_fib->fib_index == new_fib_index) + { + outside_fib->refcount++; + is_add = 0; + break; + } + } + + if (is_add) + { + vec_add2 (sm->outside_fibs, outside_fib, 1); + outside_fib->refcount = 1; + outside_fib->fib_index = new_fib_index; + } +} + +static void +snat_update_outside_fib (ip4_main_t * im, uword opaque, + u32 sw_if_index, u32 new_fib_index, + u32 old_fib_index); + +static void +snat_ip4_add_del_interface_address_cb (ip4_main_t * im, + uword opaque, + u32 sw_if_index, + ip4_address_t * address, + u32 address_length, + u32 if_address_index, u32 is_delete); + +static void +nat_ip4_add_del_addr_only_sm_cb (ip4_main_t * im, + uword opaque, + u32 sw_if_index, + ip4_address_t * address, + u32 address_length, + u32 if_address_index, u32 is_delete); + +void +test_key_calc_split () +{ + ip4_address_t l_addr; + l_addr.as_u8[0] = 1; + l_addr.as_u8[1] = 1; + l_addr.as_u8[2] = 1; + l_addr.as_u8[3] = 1; + ip4_address_t r_addr; + r_addr.as_u8[0] = 2; + r_addr.as_u8[1] = 2; + r_addr.as_u8[2] = 2; + r_addr.as_u8[3] = 2; + u16 l_port = 40001; + u16 r_port = 40301; + u8 proto = 9; + u32 fib_index = 9000001; + u32 thread_index = 3000000001; + u32 session_index = 3000000221; + clib_bihash_kv_16_8_t kv; + init_ed_kv (&kv, l_addr, l_port, r_addr, r_port, fib_index, proto, + thread_index, session_index); + ip4_address_t l_addr2; + ip4_address_t r_addr2; + clib_memset (&l_addr2, 0, sizeof (l_addr2)); + clib_memset (&r_addr2, 0, sizeof (r_addr2)); + u16 l_port2 = 0; + u16 r_port2 = 0; + u8 proto2 = 0; + u32 fib_index2 = 0; + split_ed_kv (&kv, &l_addr2, &r_addr2, &proto2, &fib_index2, &l_port2, + &r_port2); + ASSERT (l_addr.as_u32 == l_addr2.as_u32); + ASSERT (r_addr.as_u32 == r_addr2.as_u32); + ASSERT (l_port == l_port2); + ASSERT (r_port == r_port2); + ASSERT (proto == proto2); + ASSERT (fib_index == fib_index2); + ASSERT (thread_index == ed_value_get_thread_index (&kv)); + ASSERT (session_index == ed_value_get_session_index (&kv)); + + fib_index = 7001; + proto = 5; + nat_protocol_t proto3 = ~0; + u64 key = calc_nat_key (l_addr, l_port, fib_index, proto); + split_nat_key (key, &l_addr2, &l_port2, &fib_index2, &proto3); + ASSERT (l_addr.as_u32 == l_addr2.as_u32); + ASSERT (l_port == l_port2); + ASSERT (proto == proto3); + ASSERT (fib_index == fib_index2); +} + +static clib_error_t * +nat_ip_table_add_del (vnet_main_t * vnm, u32 table_id, u32 is_add) +{ + u32 fib_index; + + // TODO: consider removing all NAT interfaces + if (!is_add) + { + fib_index = ip4_fib_index_from_table_id (table_id); + if (fib_index != ~0) + expire_per_vrf_sessions (fib_index); + } + return 0; +} + +VNET_IP_TABLE_ADD_DEL_FUNCTION (nat_ip_table_add_del); + +void +nat44_set_node_indexes (snat_main_t * sm, vlib_main_t * vm) +{ + vlib_node_t *node; + + node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-out2in"); + sm->in2out_node_index = node->index; + + node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out"); + sm->out2in_node_index = node->index; + + node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out-output"); + sm->in2out_output_node_index = node->index; +} + +#define nat_validate_simple_counter(c, i) \ + do \ + { \ + vlib_validate_simple_counter (&c, i); \ + vlib_zero_simple_counter (&c, i); \ + } \ + while (0); + +#define nat_init_simple_counter(c, n, sn) \ + do \ + { \ + c.name = n; \ + c.stat_segment_name = sn; \ + nat_validate_simple_counter (c, 0); \ + } \ + while (0); + +static_always_inline void +nat_validate_interface_counters (snat_main_t *sm, u32 sw_if_index) +{ +#define _(x) \ + nat_validate_simple_counter (sm->counters.fastpath.in2out.x, sw_if_index); \ + nat_validate_simple_counter (sm->counters.fastpath.out2in.x, sw_if_index); \ + nat_validate_simple_counter (sm->counters.slowpath.in2out.x, sw_if_index); \ + nat_validate_simple_counter (sm->counters.slowpath.out2in.x, sw_if_index); + foreach_nat_counter; +#undef _ + nat_validate_simple_counter (sm->counters.hairpinning, sw_if_index); +} + +static clib_error_t * +nat_init (vlib_main_t * vm) +{ + snat_main_t *sm = &snat_main; + vlib_thread_main_t *tm = vlib_get_thread_main (); + vlib_thread_registration_t *tr; + ip4_add_del_interface_address_callback_t cbi = { 0 }; + ip4_table_bind_callback_t cbt = { 0 }; + u32 i, num_threads = 0; + uword *p, *bitmap = 0; + + clib_memset (sm, 0, sizeof (*sm)); + + // required + sm->vnet_main = vnet_get_main (); + // convenience + sm->ip4_main = &ip4_main; + sm->api_main = vlibapi_get_main (); + sm->ip4_lookup_main = &ip4_main.lookup_main; + + // frame queue indices used for handoff + sm->fq_out2in_index = ~0; + sm->fq_in2out_index = ~0; + sm->fq_in2out_output_index = ~0; + + sm->log_level = NAT_LOG_ERROR; + + nat44_set_node_indexes (sm, vm); + sm->log_class = vlib_log_register_class ("nat", 0); + nat_ipfix_logging_init (vm); + + nat_init_simple_counter (sm->total_sessions, "total-sessions", + "/nat44-ed/total-sessions"); + +#define _(x) \ + nat_init_simple_counter (sm->counters.fastpath.in2out.x, #x, \ + "/nat44-ed/in2out/fastpath/" #x); \ + nat_init_simple_counter (sm->counters.fastpath.out2in.x, #x, \ + "/nat44-ed/out2in/fastpath/" #x); \ + nat_init_simple_counter (sm->counters.slowpath.in2out.x, #x, \ + "/nat44-ed/in2out/slowpath/" #x); \ + nat_init_simple_counter (sm->counters.slowpath.out2in.x, #x, \ + "/nat44-ed/out2in/slowpath/" #x); + foreach_nat_counter; +#undef _ + nat_init_simple_counter (sm->counters.hairpinning, "hairpinning", + "/nat44-ed/hairpinning"); + + p = hash_get_mem (tm->thread_registrations_by_name, "workers"); + if (p) + { + tr = (vlib_thread_registration_t *) p[0]; + if (tr) + { + sm->num_workers = tr->count; + sm->first_worker_index = tr->first_index; + } + } + num_threads = tm->n_vlib_mains - 1; + sm->port_per_thread = 0xffff - 1024; + vec_validate (sm->per_thread_data, num_threads); + + /* Use all available workers by default */ + if (sm->num_workers > 1) + { + + for (i = 0; i < sm->num_workers; i++) + bitmap = clib_bitmap_set (bitmap, i, 1); + snat_set_workers (bitmap); + clib_bitmap_free (bitmap); + } + else + sm->per_thread_data[0].snat_thread_index = 0; + + /* callbacks to call when interface address changes. */ + cbi.function = snat_ip4_add_del_interface_address_cb; + vec_add1 (sm->ip4_main->add_del_interface_address_callbacks, cbi); + cbi.function = nat_ip4_add_del_addr_only_sm_cb; + vec_add1 (sm->ip4_main->add_del_interface_address_callbacks, cbi); + + /* callbacks to call when interface to table biding changes */ + cbt.function = snat_update_outside_fib; + vec_add1 (sm->ip4_main->table_bind_callbacks, cbt); + + sm->fib_src_low = + fib_source_allocate ("nat-low", FIB_SOURCE_PRIORITY_LOW, + FIB_SOURCE_BH_SIMPLE); + sm->fib_src_hi = + fib_source_allocate ("nat-hi", FIB_SOURCE_PRIORITY_HI, + FIB_SOURCE_BH_SIMPLE); + + nat_affinity_init (vm); + test_key_calc_split (); + + return nat44_api_hookup (vm); +} + +VLIB_INIT_FUNCTION (nat_init); + +int +nat44_plugin_enable (nat44_config_t c) +{ + snat_main_t *sm = &snat_main; + + fail_if_enabled (); + + // UPDATE based on these appropriate API/CLI + // c.static_mapping_only + c.connection_tracking + // - supported in NAT EI & NAT ED + // c.out2in_dpo, c.static_mapping_only + // - supported in NAT EI + + if (c.static_mapping_only && !c.connection_tracking) + { + nat_log_err ("unsupported combination of configuration"); + return 1; + } + + // nat44 feature configuration + sm->static_mapping_only = c.static_mapping_only; + sm->static_mapping_connection_tracking = c.connection_tracking; + + sm->forwarding_enabled = 0; + sm->mss_clamping = 0; + sm->pat = (!c.static_mapping_only || + (c.static_mapping_only && c.connection_tracking)); + + if (!c.sessions) + c.sessions = 63 * 1024; + + sm->max_translations_per_thread = c.sessions; + sm->translation_buckets = nat_calc_bihash_buckets (c.sessions); + + // ED only feature + vec_add1 (sm->max_translations_per_fib, sm->max_translations_per_thread); + + sm->inside_vrf_id = c.inside_vrf; + sm->inside_fib_index = + fib_table_find_or_create_and_lock + (FIB_PROTOCOL_IP4, c.inside_vrf, sm->fib_src_hi); + + sm->outside_vrf_id = c.outside_vrf; + sm->outside_fib_index = fib_table_find_or_create_and_lock ( + FIB_PROTOCOL_IP4, c.outside_vrf, sm->fib_src_hi); + + sm->worker_in2out_cb = nat44_ed_get_worker_in2out_cb; + sm->worker_out2in_cb = nat44_ed_get_worker_out2in_cb; + + nat44_ed_db_init (sm->max_translations_per_thread, sm->translation_buckets); + + nat_affinity_enable (); + + nat_reset_timeouts (&sm->timeouts); + + vlib_zero_simple_counter (&sm->total_sessions, 0); + + if (!sm->frame_queue_nelts) + sm->frame_queue_nelts = NAT_FQ_NELTS_DEFAULT; + + sm->enabled = 1; + sm->rconfig = c; + + return 0; +} + +void +nat44_addresses_free (snat_address_t ** addresses) +{ + snat_address_t *ap; + vec_foreach (ap, *addresses) + { + #define _(N, i, n, s) \ + vec_free (ap->busy_##n##_ports_per_thread); + foreach_nat_protocol + #undef _ + } + vec_free (*addresses); + *addresses = 0; +} + +int +nat44_plugin_disable () +{ + snat_main_t *sm = &snat_main; + snat_interface_t *i, *vec; + int error = 0; + + fail_if_disabled (); + + // first unregister all nodes from interfaces + vec = vec_dup (sm->interfaces); + vec_foreach (i, vec) + { + if (nat_interface_is_inside(i)) + error = snat_interface_add_del (i->sw_if_index, 1, 1); + if (nat_interface_is_outside(i)) + error = snat_interface_add_del (i->sw_if_index, 0, 1); + + if (error) + { + nat_log_err ("error occurred while removing interface %u", + i->sw_if_index); + } + } + vec_free (vec); + sm->interfaces = 0; + + vec = vec_dup (sm->output_feature_interfaces); + vec_foreach (i, vec) + { + if (nat_interface_is_inside(i)) + error = snat_interface_add_del_output_feature (i->sw_if_index, 1, 1); + if (nat_interface_is_outside(i)) + error = snat_interface_add_del_output_feature (i->sw_if_index, 0, 1); + + if (error) + { + nat_log_err ("error occurred while removing interface %u", + i->sw_if_index); + } + } + vec_free (vec); + sm->output_feature_interfaces = 0; + + vec_free (sm->max_translations_per_fib); + + nat44_ed_db_free (); + + nat44_addresses_free (&sm->addresses); + nat44_addresses_free (&sm->twice_nat_addresses); + + vec_free (sm->to_resolve); + vec_free (sm->auto_add_sw_if_indices); + vec_free (sm->auto_add_sw_if_indices_twice_nat); + + sm->to_resolve = 0; + sm->auto_add_sw_if_indices = 0; + sm->auto_add_sw_if_indices_twice_nat = 0; + + sm->forwarding_enabled = 0; + + sm->enabled = 0; + clib_memset (&sm->rconfig, 0, sizeof (sm->rconfig)); + + return 0; +} + +void +nat44_ed_forwarding_enable_disable (u8 is_enable) +{ + snat_main_per_thread_data_t *tsm; + snat_main_t *sm = &snat_main; + snat_session_t *s; + + u32 *ses_to_be_removed = 0, *ses_index; + + sm->forwarding_enabled = is_enable != 0; + + if (is_enable) + return; + + vec_foreach (tsm, sm->per_thread_data) + { + pool_foreach (s, tsm->sessions) + { + if (is_fwd_bypass_session (s)) + { + vec_add1 (ses_to_be_removed, s - tsm->sessions); + } + } + vec_foreach (ses_index, ses_to_be_removed) + { + s = pool_elt_at_index (tsm->sessions, ses_index[0]); + nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); + nat_ed_session_delete (sm, s, tsm - sm->per_thread_data, 1); + } + + vec_free (ses_to_be_removed); + } +} + +void +snat_free_outside_address_and_port (snat_address_t *addresses, + u32 thread_index, ip4_address_t *addr, + u16 port, nat_protocol_t protocol) +{ + snat_main_t *sm = &snat_main; + snat_address_t *a; + u32 address_index; + u16 port_host_byte_order = clib_net_to_host_u16 (port); + + for (address_index = 0; address_index < vec_len (addresses); + address_index++) + { + if (addresses[address_index].addr.as_u32 == addr->as_u32) + break; + } + + ASSERT (address_index < vec_len (addresses)); + + a = addresses + address_index; + + switch (protocol) + { +#define _(N, i, n, s) \ + case NAT_PROTOCOL_##N: \ + ASSERT (a->busy_##n##_port_refcounts[port_host_byte_order] >= 1); \ + --a->busy_##n##_port_refcounts[port_host_byte_order]; \ + a->busy_##n##_ports--; \ + a->busy_##n##_ports_per_thread[thread_index]--; \ + break; + foreach_nat_protocol +#undef _ + default : nat_elog_info (sm, "unknown protocol"); + return; + } +} + +int +nat_set_outside_address_and_port (snat_address_t *addresses, u32 thread_index, + ip4_address_t addr, u16 port, + nat_protocol_t protocol) +{ + snat_main_t *sm = &snat_main; + snat_address_t *a = 0; + u32 address_index; + u16 port_host_byte_order = clib_net_to_host_u16 (port); + + for (address_index = 0; address_index < vec_len (addresses); + address_index++) + { + if (addresses[address_index].addr.as_u32 != addr.as_u32) + continue; + + a = addresses + address_index; + switch (protocol) + { +#define _(N, j, n, s) \ + case NAT_PROTOCOL_##N: \ + if (a->busy_##n##_port_refcounts[port_host_byte_order]) \ + return VNET_API_ERROR_INSTANCE_IN_USE; \ + ++a->busy_##n##_port_refcounts[port_host_byte_order]; \ + a->busy_##n##_ports_per_thread[thread_index]++; \ + a->busy_##n##_ports++; \ + return 0; + foreach_nat_protocol +#undef _ + default : nat_elog_info (sm, "unknown protocol"); + return 1; + } + } + + return VNET_API_ERROR_NO_SUCH_ENTRY; +} + +int +snat_static_mapping_match (snat_main_t * sm, + ip4_address_t match_addr, + u16 match_port, + u32 match_fib_index, + nat_protocol_t match_protocol, + ip4_address_t * mapping_addr, + u16 * mapping_port, + u32 * mapping_fib_index, + u8 by_external, + u8 * is_addr_only, + twice_nat_type_t * twice_nat, + lb_nat_type_t * lb, ip4_address_t * ext_host_addr, + u8 * is_identity_nat, snat_static_mapping_t ** out) +{ + clib_bihash_kv_8_8_t kv, value; + clib_bihash_8_8_t *mapping_hash; + snat_static_mapping_t *m; + u32 rand, lo = 0, hi, mid, *tmp = 0, i; + nat44_lb_addr_port_t *local; + u8 backend_index; + + if (!by_external) + { + mapping_hash = &sm->static_mapping_by_local; + init_nat_k (&kv, match_addr, match_port, match_fib_index, + match_protocol); + if (clib_bihash_search_8_8 (mapping_hash, &kv, &value)) + { + /* Try address only mapping */ + init_nat_k (&kv, match_addr, 0, match_fib_index, 0); + if (clib_bihash_search_8_8 (mapping_hash, &kv, &value)) + return 1; + } + } + else + { + mapping_hash = &sm->static_mapping_by_external; + init_nat_k (&kv, match_addr, match_port, 0, match_protocol); + if (clib_bihash_search_8_8 (mapping_hash, &kv, &value)) + { + /* Try address only mapping */ + init_nat_k (&kv, match_addr, 0, 0, 0); + if (clib_bihash_search_8_8 (mapping_hash, &kv, &value)) + return 1; + } + } + + m = pool_elt_at_index (sm->static_mappings, value.value); + + if (by_external) + { + if (is_lb_static_mapping (m)) + { + if (PREDICT_FALSE (lb != 0)) + *lb = m->affinity ? AFFINITY_LB_NAT : LB_NAT; + if (m->affinity && !nat_affinity_find_and_lock (ext_host_addr[0], + match_addr, + match_protocol, + match_port, + &backend_index)) + { + local = pool_elt_at_index (m->locals, backend_index); + *mapping_addr = local->addr; + *mapping_port = local->port; + *mapping_fib_index = local->fib_index; + goto end; + } + // pick locals matching this worker + if (PREDICT_FALSE (sm->num_workers > 1)) + { + u32 thread_index = vlib_get_thread_index (); + pool_foreach_index (i, m->locals) + { + local = pool_elt_at_index (m->locals, i); + + ip4_header_t ip = { + .src_address = local->addr, + }; + + if (sm->worker_in2out_cb (&ip, m->fib_index, 0) == + thread_index) + { + vec_add1 (tmp, i); + } + } + ASSERT (vec_len (tmp) != 0); + } + else + { + pool_foreach_index (i, m->locals) + { + vec_add1 (tmp, i); + } + } + hi = vec_len (tmp) - 1; + local = pool_elt_at_index (m->locals, tmp[hi]); + rand = 1 + (random_u32 (&sm->random_seed) % local->prefix); + while (lo < hi) + { + mid = ((hi - lo) >> 1) + lo; + local = pool_elt_at_index (m->locals, tmp[mid]); + (rand > local->prefix) ? (lo = mid + 1) : (hi = mid); + } + local = pool_elt_at_index (m->locals, tmp[lo]); + if (!(local->prefix >= rand)) + return 1; + *mapping_addr = local->addr; + *mapping_port = local->port; + *mapping_fib_index = local->fib_index; + if (m->affinity) + { + if (nat_affinity_create_and_lock (ext_host_addr[0], match_addr, + match_protocol, match_port, + tmp[lo], m->affinity, + m->affinity_per_service_list_head_index)) + nat_elog_info (sm, "create affinity record failed"); + } + vec_free (tmp); + } + else + { + if (PREDICT_FALSE (lb != 0)) + *lb = NO_LB_NAT; + *mapping_fib_index = m->fib_index; + *mapping_addr = m->local_addr; + /* Address only mapping doesn't change port */ + *mapping_port = is_addr_only_static_mapping (m) ? match_port + : m->local_port; + } + } + else + { + *mapping_addr = m->external_addr; + /* Address only mapping doesn't change port */ + *mapping_port = is_addr_only_static_mapping (m) ? match_port + : m->external_port; + *mapping_fib_index = sm->outside_fib_index; + } + +end: + if (PREDICT_FALSE (is_addr_only != 0)) + *is_addr_only = is_addr_only_static_mapping (m); + + if (PREDICT_FALSE (twice_nat != 0)) + *twice_nat = m->twice_nat; + + if (PREDICT_FALSE (is_identity_nat != 0)) + *is_identity_nat = is_identity_static_mapping (m); + + if (out != 0) + *out = m; + + return 0; +} + +static u32 +nat44_ed_get_worker_in2out_cb (ip4_header_t *ip, u32 rx_fib_index, + u8 is_output) +{ + snat_main_t *sm = &snat_main; + u32 next_worker_index = sm->first_worker_index; + u32 hash; + + clib_bihash_kv_16_8_t kv16, value16; + snat_main_per_thread_data_t *tsm; + udp_header_t *udp; + + if (PREDICT_FALSE (is_output)) + { + u32 fib_index = sm->outside_fib_index; + nat_outside_fib_t *outside_fib; + fib_node_index_t fei = FIB_NODE_INDEX_INVALID; + fib_prefix_t pfx = { + .fp_proto = FIB_PROTOCOL_IP4, + .fp_len = 32, + .fp_addr = { + .ip4.as_u32 = ip->dst_address.as_u32, + } + , + }; + + udp = ip4_next_header (ip); + + switch (vec_len (sm->outside_fibs)) + { + case 0: + fib_index = sm->outside_fib_index; + break; + case 1: + fib_index = sm->outside_fibs[0].fib_index; + break; + default: + /* *INDENT-OFF* */ + vec_foreach (outside_fib, sm->outside_fibs) + { + fei = fib_table_lookup (outside_fib->fib_index, &pfx); + if (FIB_NODE_INDEX_INVALID != fei) + { + if (fib_entry_get_resolving_interface (fei) != ~0) + { + fib_index = outside_fib->fib_index; + break; + } + } + } + /* *INDENT-ON* */ + break; + } + + init_ed_k (&kv16, ip->src_address, udp->src_port, ip->dst_address, + udp->dst_port, fib_index, ip->protocol); + + if (PREDICT_TRUE ( + !clib_bihash_search_16_8 (&sm->flow_hash, &kv16, &value16))) + { + tsm = + vec_elt_at_index (sm->per_thread_data, + ed_value_get_thread_index (&value16)); + next_worker_index += tsm->thread_index; + + nat_elog_debug_handoff ( + sm, "HANDOFF IN2OUT-OUTPUT-FEATURE (session)", next_worker_index, + fib_index, clib_net_to_host_u32 (ip->src_address.as_u32), + clib_net_to_host_u32 (ip->dst_address.as_u32)); + + return next_worker_index; + } + } + + hash = ip->src_address.as_u32 + (ip->src_address.as_u32 >> 8) + + (ip->src_address.as_u32 >> 16) + (ip->src_address.as_u32 >> 24); + + if (PREDICT_TRUE (is_pow2 (_vec_len (sm->workers)))) + next_worker_index += sm->workers[hash & (_vec_len (sm->workers) - 1)]; + else + next_worker_index += sm->workers[hash % _vec_len (sm->workers)]; + + if (PREDICT_TRUE (!is_output)) + { + nat_elog_debug_handoff (sm, "HANDOFF IN2OUT", next_worker_index, + rx_fib_index, + clib_net_to_host_u32 (ip->src_address.as_u32), + clib_net_to_host_u32 (ip->dst_address.as_u32)); + } + else + { + nat_elog_debug_handoff (sm, "HANDOFF IN2OUT-OUTPUT-FEATURE", + next_worker_index, rx_fib_index, + clib_net_to_host_u32 (ip->src_address.as_u32), + clib_net_to_host_u32 (ip->dst_address.as_u32)); + } + + return next_worker_index; +} + +static u32 +nat44_ed_get_worker_out2in_cb (vlib_buffer_t * b, ip4_header_t * ip, + u32 rx_fib_index, u8 is_output) +{ + snat_main_t *sm = &snat_main; + clib_bihash_kv_8_8_t kv, value; + clib_bihash_kv_16_8_t kv16, value16; + snat_main_per_thread_data_t *tsm; + + u32 proto, next_worker_index = 0; + udp_header_t *udp; + u16 port; + snat_static_mapping_t *m; + u32 hash; + + proto = ip_proto_to_nat_proto (ip->protocol); + + if (PREDICT_TRUE (proto == NAT_PROTOCOL_UDP || proto == NAT_PROTOCOL_TCP)) + { + udp = ip4_next_header (ip); + + init_ed_k (&kv16, ip->dst_address, udp->dst_port, ip->src_address, + udp->src_port, rx_fib_index, ip->protocol); + + if (PREDICT_TRUE ( + !clib_bihash_search_16_8 (&sm->flow_hash, &kv16, &value16))) + { + tsm = + vec_elt_at_index (sm->per_thread_data, + ed_value_get_thread_index (&value16)); + vnet_buffer2 (b)->nat.cached_session_index = + ed_value_get_session_index (&value16); + next_worker_index = sm->first_worker_index + tsm->thread_index; + nat_elog_debug_handoff ( + sm, "HANDOFF OUT2IN (session)", next_worker_index, rx_fib_index, + clib_net_to_host_u32 (ip->src_address.as_u32), + clib_net_to_host_u32 (ip->dst_address.as_u32)); + return next_worker_index; + } + } + else if (proto == NAT_PROTOCOL_ICMP) + { + ip4_address_t lookup_saddr, lookup_daddr; + u16 lookup_sport, lookup_dport; + u8 lookup_protocol; + if (!nat_get_icmp_session_lookup_values ( + b, ip, &lookup_saddr, &lookup_sport, &lookup_daddr, &lookup_dport, + &lookup_protocol)) + { + init_ed_k (&kv16, lookup_saddr, lookup_sport, lookup_daddr, + lookup_dport, rx_fib_index, lookup_protocol); + if (PREDICT_TRUE ( + !clib_bihash_search_16_8 (&sm->flow_hash, &kv16, &value16))) + { + tsm = + vec_elt_at_index (sm->per_thread_data, + ed_value_get_thread_index (&value16)); + next_worker_index = sm->first_worker_index + tsm->thread_index; + nat_elog_debug_handoff ( + sm, "HANDOFF OUT2IN (session)", next_worker_index, + rx_fib_index, clib_net_to_host_u32 (ip->src_address.as_u32), + clib_net_to_host_u32 (ip->dst_address.as_u32)); + return next_worker_index; + } + } + } + + /* first try static mappings without port */ + if (PREDICT_FALSE (pool_elts (sm->static_mappings))) + { + init_nat_k (&kv, ip->dst_address, 0, 0, 0); + if (!clib_bihash_search_8_8 + (&sm->static_mapping_by_external, &kv, &value)) + { + m = pool_elt_at_index (sm->static_mappings, value.value); + next_worker_index = m->workers[0]; + goto done; + } + } + + /* unknown protocol */ + if (PREDICT_FALSE (proto == NAT_PROTOCOL_OTHER)) + { + /* use current thread */ + next_worker_index = vlib_get_thread_index (); + goto done; + } + + udp = ip4_next_header (ip); + port = udp->dst_port; + + if (PREDICT_FALSE (ip->protocol == IP_PROTOCOL_ICMP)) + { + icmp46_header_t *icmp = (icmp46_header_t *) udp; + icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1); + if (!icmp_type_is_error_message + (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)) + port = vnet_buffer (b)->ip.reass.l4_src_port; + else + { + /* if error message, then it's not fragmented and we can access it */ + ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1); + proto = ip_proto_to_nat_proto (inner_ip->protocol); + void *l4_header = ip4_next_header (inner_ip); + switch (proto) + { + case NAT_PROTOCOL_ICMP: + icmp = (icmp46_header_t *) l4_header; + echo = (icmp_echo_header_t *) (icmp + 1); + port = echo->identifier; + break; + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + port = ((tcp_udp_header_t *) l4_header)->src_port; + break; + default: + next_worker_index = vlib_get_thread_index (); + goto done; + } + } + } + + /* try static mappings with port */ + if (PREDICT_FALSE (pool_elts (sm->static_mappings))) + { + init_nat_k (&kv, ip->dst_address, port, 0, proto); + if (!clib_bihash_search_8_8 + (&sm->static_mapping_by_external, &kv, &value)) + { + m = pool_elt_at_index (sm->static_mappings, value.value); + if (!is_lb_static_mapping (m)) + { + next_worker_index = m->workers[0]; + goto done; + } + + hash = ip->src_address.as_u32 + (ip->src_address.as_u32 >> 8) + + (ip->src_address.as_u32 >> 16) + (ip->src_address.as_u32 >> 24); + + if (PREDICT_TRUE (is_pow2 (_vec_len (m->workers)))) + next_worker_index = + m->workers[hash & (_vec_len (m->workers) - 1)]; + else + next_worker_index = m->workers[hash % _vec_len (m->workers)]; + goto done; + } + } + + /* worker by outside port */ + next_worker_index = sm->first_worker_index; + next_worker_index += + sm->workers[(clib_net_to_host_u16 (port) - 1024) / sm->port_per_thread]; + +done: + nat_elog_debug_handoff (sm, "HANDOFF OUT2IN", next_worker_index, + rx_fib_index, + clib_net_to_host_u32 (ip->src_address.as_u32), + clib_net_to_host_u32 (ip->dst_address.as_u32)); + return next_worker_index; +} + +u32 +nat44_get_max_session_limit () +{ + snat_main_t *sm = &snat_main; + u32 max_limit = 0, len = 0; + + for (; len < vec_len (sm->max_translations_per_fib); len++) + { + if (max_limit < sm->max_translations_per_fib[len]) + max_limit = sm->max_translations_per_fib[len]; + } + return max_limit; +} + +int +nat44_set_session_limit (u32 session_limit, u32 vrf_id) +{ + snat_main_t *sm = &snat_main; + u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id); + u32 len = vec_len (sm->max_translations_per_fib); + + if (len <= fib_index) + { + vec_validate (sm->max_translations_per_fib, fib_index + 1); + + for (; len < vec_len (sm->max_translations_per_fib); len++) + sm->max_translations_per_fib[len] = sm->max_translations_per_thread; + } + + sm->max_translations_per_fib[fib_index] = session_limit; + return 0; +} + +int +nat44_update_session_limit (u32 session_limit, u32 vrf_id) +{ + snat_main_t *sm = &snat_main; + + if (nat44_set_session_limit (session_limit, vrf_id)) + return 1; + sm->max_translations_per_thread = nat44_get_max_session_limit (); + + sm->translation_buckets = + nat_calc_bihash_buckets (sm->max_translations_per_thread); + + nat44_ed_sessions_clear (); + return 0; +} + +static void +nat44_ed_worker_db_init (snat_main_per_thread_data_t *tsm, u32 translations, + u32 translation_buckets) +{ + dlist_elt_t *head; + + pool_alloc (tsm->sessions, translations); + pool_alloc (tsm->lru_pool, translations); + + pool_get (tsm->lru_pool, head); + tsm->tcp_trans_lru_head_index = head - tsm->lru_pool; + clib_dlist_init (tsm->lru_pool, tsm->tcp_trans_lru_head_index); + + pool_get (tsm->lru_pool, head); + tsm->tcp_estab_lru_head_index = head - tsm->lru_pool; + clib_dlist_init (tsm->lru_pool, tsm->tcp_estab_lru_head_index); + + pool_get (tsm->lru_pool, head); + tsm->udp_lru_head_index = head - tsm->lru_pool; + clib_dlist_init (tsm->lru_pool, tsm->udp_lru_head_index); + + pool_get (tsm->lru_pool, head); + tsm->icmp_lru_head_index = head - tsm->lru_pool; + clib_dlist_init (tsm->lru_pool, tsm->icmp_lru_head_index); + + pool_get (tsm->lru_pool, head); + tsm->unk_proto_lru_head_index = head - tsm->lru_pool; + clib_dlist_init (tsm->lru_pool, tsm->unk_proto_lru_head_index); +} + +static void +reinit_ed_flow_hash () +{ + snat_main_t *sm = &snat_main; + // we expect 2 flows per session, so multiply translation_buckets by 2 + clib_bihash_init_16_8 ( + &sm->flow_hash, "ed-flow-hash", + clib_max (1, sm->num_workers) * 2 * sm->translation_buckets, 0); + clib_bihash_set_kvp_format_fn_16_8 (&sm->flow_hash, format_ed_session_kvp); +} + +static void +nat44_ed_db_init (u32 translations, u32 translation_buckets) +{ + snat_main_t *sm = &snat_main; + snat_main_per_thread_data_t *tsm; + u32 static_mapping_buckets = 1024; + u32 static_mapping_memory_size = 64 << 20; + + reinit_ed_flow_hash (); + + clib_bihash_init_8_8 (&sm->static_mapping_by_local, + "static_mapping_by_local", static_mapping_buckets, + static_mapping_memory_size); + clib_bihash_set_kvp_format_fn_8_8 (&sm->static_mapping_by_local, + format_static_mapping_kvp); + + clib_bihash_init_8_8 (&sm->static_mapping_by_external, + "static_mapping_by_external", static_mapping_buckets, + static_mapping_memory_size); + clib_bihash_set_kvp_format_fn_8_8 (&sm->static_mapping_by_external, + format_static_mapping_kvp); + + if (sm->pat) + { + vec_foreach (tsm, sm->per_thread_data) + { + nat44_ed_worker_db_init (tsm, sm->max_translations_per_thread, + sm->translation_buckets); + } + } +} + +static void +nat44_ed_worker_db_free (snat_main_per_thread_data_t *tsm) +{ + pool_free (tsm->lru_pool); + pool_free (tsm->sessions); + vec_free (tsm->per_vrf_sessions_vec); +} + +static void +nat44_ed_db_free () +{ + snat_main_t *sm = &snat_main; + snat_main_per_thread_data_t *tsm; + + pool_free (sm->static_mappings); + clib_bihash_free_16_8 (&sm->flow_hash); + clib_bihash_free_8_8 (&sm->static_mapping_by_local); + clib_bihash_free_8_8 (&sm->static_mapping_by_external); + + if (sm->pat) + { + vec_foreach (tsm, sm->per_thread_data) + { + nat44_ed_worker_db_free (tsm); + } + } +} + +void +nat44_ed_sessions_clear () +{ + snat_main_t *sm = &snat_main; + snat_main_per_thread_data_t *tsm; + + reinit_ed_flow_hash (); + + if (sm->pat) + { + vec_foreach (tsm, sm->per_thread_data) + { + + nat44_ed_worker_db_free (tsm); + nat44_ed_worker_db_init (tsm, sm->max_translations_per_thread, + sm->translation_buckets); + } + } + vlib_zero_simple_counter (&sm->total_sessions, 0); +} + +static void +nat_ip4_add_del_addr_only_sm_cb (ip4_main_t * im, + uword opaque, + u32 sw_if_index, + ip4_address_t * address, + u32 address_length, + u32 if_address_index, u32 is_delete) +{ + snat_main_t *sm = &snat_main; + snat_static_map_resolve_t *rp; + snat_static_mapping_t *m; + clib_bihash_kv_8_8_t kv, value; + int i, rv; + ip4_address_t l_addr; + + if (!sm->enabled) + return; + + for (i = 0; i < vec_len (sm->to_resolve); i++) + { + rp = sm->to_resolve + i; + if (rp->addr_only == 0) + continue; + if (rp->sw_if_index == sw_if_index) + goto match; + } + + return; + +match: + init_nat_k (&kv, *address, rp->addr_only ? 0 : rp->e_port, + sm->outside_fib_index, rp->addr_only ? 0 : rp->proto); + if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) + m = 0; + else + m = pool_elt_at_index (sm->static_mappings, value.value); + + if (!is_delete) + { + /* Don't trip over lease renewal, static config */ + if (m) + return; + } + else + { + if (!m) + return; + } + + /* Indetity mapping? */ + if (rp->l_addr.as_u32 == 0) + l_addr.as_u32 = address[0].as_u32; + else + l_addr.as_u32 = rp->l_addr.as_u32; + /* Add the static mapping */ + rv = snat_add_static_mapping (l_addr, + address[0], + rp->l_port, + rp->e_port, + rp->vrf_id, + rp->addr_only, ~0 /* sw_if_index */ , + rp->proto, !is_delete, rp->twice_nat, + rp->out2in_only, rp->tag, rp->identity_nat, + rp->pool_addr, rp->exact); + if (rv) + nat_elog_notice_X1 (sm, "snat_add_static_mapping returned %d", "i4", rv); +} + +static void +snat_ip4_add_del_interface_address_cb (ip4_main_t * im, + uword opaque, + u32 sw_if_index, + ip4_address_t * address, + u32 address_length, + u32 if_address_index, u32 is_delete) +{ + snat_main_t *sm = &snat_main; + snat_static_map_resolve_t *rp; + ip4_address_t l_addr; + int i, j; + int rv; + u8 twice_nat = 0; + snat_address_t *addresses = sm->addresses; + + if (!sm->enabled) + return; + + for (i = 0; i < vec_len (sm->auto_add_sw_if_indices); i++) + { + if (sw_if_index == sm->auto_add_sw_if_indices[i]) + goto match; + } + + for (i = 0; i < vec_len (sm->auto_add_sw_if_indices_twice_nat); i++) + { + twice_nat = 1; + addresses = sm->twice_nat_addresses; + if (sw_if_index == sm->auto_add_sw_if_indices_twice_nat[i]) + goto match; + } + + return; + +match: + if (!is_delete) + { + /* Don't trip over lease renewal, static config */ + for (j = 0; j < vec_len (addresses); j++) + if (addresses[j].addr.as_u32 == address->as_u32) + return; + + (void) snat_add_address (sm, address, ~0, twice_nat); + /* Scan static map resolution vector */ + for (j = 0; j < vec_len (sm->to_resolve); j++) + { + rp = sm->to_resolve + j; + if (rp->addr_only) + continue; + /* On this interface? */ + if (rp->sw_if_index == sw_if_index) + { + /* Indetity mapping? */ + if (rp->l_addr.as_u32 == 0) + l_addr.as_u32 = address[0].as_u32; + else + l_addr.as_u32 = rp->l_addr.as_u32; + /* Add the static mapping */ + rv = snat_add_static_mapping ( + l_addr, address[0], rp->l_port, rp->e_port, rp->vrf_id, + rp->addr_only, ~0 /* sw_if_index */, rp->proto, 1, + rp->twice_nat, rp->out2in_only, rp->tag, rp->identity_nat, + rp->pool_addr, rp->exact); + if (rv) + nat_elog_notice_X1 (sm, "snat_add_static_mapping returned %d", + "i4", rv); + } + } + return; + } + else + { + (void) snat_del_address (sm, address[0], 1, twice_nat); + return; + } +} + +int +snat_add_interface_address (snat_main_t * sm, u32 sw_if_index, int is_del, + u8 twice_nat) +{ + ip4_main_t *ip4_main = sm->ip4_main; + ip4_address_t *first_int_addr; + snat_static_map_resolve_t *rp; + u32 *indices_to_delete = 0; + int i, j; + u32 *auto_add_sw_if_indices = + twice_nat ? sm-> + auto_add_sw_if_indices_twice_nat : sm->auto_add_sw_if_indices; + + first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index, 0 /* just want the address */ + ); + + for (i = 0; i < vec_len (auto_add_sw_if_indices); i++) + { + if (auto_add_sw_if_indices[i] == sw_if_index) + { + if (is_del) + { + /* if have address remove it */ + if (first_int_addr) + (void) snat_del_address (sm, first_int_addr[0], 1, twice_nat); + else + { + for (j = 0; j < vec_len (sm->to_resolve); j++) + { + rp = sm->to_resolve + j; + if (rp->sw_if_index == sw_if_index) + vec_add1 (indices_to_delete, j); + } + if (vec_len (indices_to_delete)) + { + for (j = vec_len (indices_to_delete) - 1; j >= 0; j--) + vec_del1 (sm->to_resolve, j); + vec_free (indices_to_delete); + } + } + if (twice_nat) + vec_del1 (sm->auto_add_sw_if_indices_twice_nat, i); + else + vec_del1 (sm->auto_add_sw_if_indices, i); + } + else + return VNET_API_ERROR_VALUE_EXIST; + + return 0; + } + } + + if (is_del) + return VNET_API_ERROR_NO_SUCH_ENTRY; + + /* add to the auto-address list */ + if (twice_nat) + vec_add1 (sm->auto_add_sw_if_indices_twice_nat, sw_if_index); + else + vec_add1 (sm->auto_add_sw_if_indices, sw_if_index); + + /* If the address is already bound - or static - add it now */ + if (first_int_addr) + (void) snat_add_address (sm, first_int_addr, ~0, twice_nat); + + return 0; +} + +int +nat44_del_ed_session (snat_main_t * sm, ip4_address_t * addr, u16 port, + ip4_address_t * eh_addr, u16 eh_port, u8 proto, + u32 vrf_id, int is_in) +{ + ip4_header_t ip; + clib_bihash_kv_16_8_t kv, value; + u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id); + snat_session_t *s; + snat_main_per_thread_data_t *tsm; + + ip.dst_address.as_u32 = ip.src_address.as_u32 = addr->as_u32; + if (sm->num_workers > 1) + tsm = + vec_elt_at_index (sm->per_thread_data, + sm->worker_in2out_cb (&ip, fib_index, 0)); + else + tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); + + init_ed_k (&kv, *addr, port, *eh_addr, eh_port, fib_index, proto); + if (clib_bihash_search_16_8 (&sm->flow_hash, &kv, &value)) + { + return VNET_API_ERROR_NO_SUCH_ENTRY; + } + + if (pool_is_free_index (tsm->sessions, ed_value_get_session_index (&value))) + return VNET_API_ERROR_UNSPECIFIED; + s = pool_elt_at_index (tsm->sessions, ed_value_get_session_index (&value)); + nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); + nat_ed_session_delete (sm, s, tsm - sm->per_thread_data, 1); + return 0; +} + +VLIB_NODE_FN (nat_default_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return 0; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (nat_default_node) = { + .name = "nat-default", + .vector_size = sizeof (u32), + .format_trace = 0, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = 0, + .n_next_nodes = NAT_N_NEXT, + .next_nodes = { + [NAT_NEXT_DROP] = "error-drop", + [NAT_NEXT_ICMP_ERROR] = "ip4-icmp-error", + [NAT_NEXT_IN2OUT_ED_FAST_PATH] = "nat44-ed-in2out", + [NAT_NEXT_IN2OUT_ED_SLOW_PATH] = "nat44-ed-in2out-slowpath", + [NAT_NEXT_IN2OUT_ED_OUTPUT_FAST_PATH] = "nat44-ed-in2out-output", + [NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath", + [NAT_NEXT_OUT2IN_ED_FAST_PATH] = "nat44-ed-out2in", + [NAT_NEXT_OUT2IN_ED_SLOW_PATH] = "nat44-ed-out2in-slowpath", + [NAT_NEXT_IN2OUT_CLASSIFY] = "nat44-in2out-worker-handoff", + [NAT_NEXT_OUT2IN_CLASSIFY] = "nat44-out2in-worker-handoff", + }, +}; +/* *INDENT-ON* */ + +void +nat_6t_l3_l4_csum_calc (nat_6t_flow_t *f) +{ + f->l3_csum_delta = 0; + f->l4_csum_delta = 0; + if (f->ops & NAT_FLOW_OP_SADDR_REWRITE && + f->rewrite.saddr.as_u32 != f->match.saddr.as_u32) + { + f->l3_csum_delta = + ip_csum_add_even (f->l3_csum_delta, f->rewrite.saddr.as_u32); + f->l3_csum_delta = + ip_csum_sub_even (f->l3_csum_delta, f->match.saddr.as_u32); + } + else + { + f->rewrite.saddr.as_u32 = f->match.saddr.as_u32; + } + if (f->ops & NAT_FLOW_OP_DADDR_REWRITE && + f->rewrite.daddr.as_u32 != f->match.daddr.as_u32) + { + f->l3_csum_delta = + ip_csum_add_even (f->l3_csum_delta, f->rewrite.daddr.as_u32); + f->l3_csum_delta = + ip_csum_sub_even (f->l3_csum_delta, f->match.daddr.as_u32); + } + else + { + f->rewrite.daddr.as_u32 = f->match.daddr.as_u32; + } + if (f->ops & NAT_FLOW_OP_SPORT_REWRITE && f->rewrite.sport != f->match.sport) + { + f->l4_csum_delta = ip_csum_add_even (f->l4_csum_delta, f->rewrite.sport); + f->l4_csum_delta = ip_csum_sub_even (f->l4_csum_delta, f->match.sport); + } + else + { + f->rewrite.sport = f->match.sport; + } + if (f->ops & NAT_FLOW_OP_DPORT_REWRITE && f->rewrite.dport != f->match.dport) + { + f->l4_csum_delta = ip_csum_add_even (f->l4_csum_delta, f->rewrite.dport); + f->l4_csum_delta = ip_csum_sub_even (f->l4_csum_delta, f->match.dport); + } + else + { + f->rewrite.dport = f->match.dport; + } + if (f->ops & NAT_FLOW_OP_ICMP_ID_REWRITE && + f->rewrite.icmp_id != f->match.icmp_id) + { + f->l4_csum_delta = + ip_csum_add_even (f->l4_csum_delta, f->rewrite.icmp_id); + f->l4_csum_delta = ip_csum_sub_even (f->l4_csum_delta, f->match.icmp_id); + } + else + { + f->rewrite.icmp_id = f->match.icmp_id; + } + if (f->ops & NAT_FLOW_OP_TXFIB_REWRITE) + { + } + else + { + f->rewrite.fib_index = f->match.fib_index; + } +} + +static_always_inline int nat_6t_flow_icmp_translate (snat_main_t *sm, + vlib_buffer_t *b, + ip4_header_t *ip, + nat_6t_flow_t *f); + +static_always_inline void +nat_6t_flow_ip4_translate (snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip, + nat_6t_flow_t *f, nat_protocol_t proto, + int is_icmp_inner_ip4) +{ + udp_header_t *udp = ip4_next_header (ip); + tcp_header_t *tcp = (tcp_header_t *) udp; + + if ((NAT_PROTOCOL_TCP == proto || NAT_PROTOCOL_UDP == proto) && + !vnet_buffer (b)->ip.reass.is_non_first_fragment) + { + if (!is_icmp_inner_ip4) + { // regular case + ip->src_address = f->rewrite.saddr; + ip->dst_address = f->rewrite.daddr; + udp->src_port = f->rewrite.sport; + udp->dst_port = f->rewrite.dport; + } + else + { // icmp inner ip4 - reversed saddr/daddr + ip->src_address = f->rewrite.daddr; + ip->dst_address = f->rewrite.saddr; + udp->src_port = f->rewrite.dport; + udp->dst_port = f->rewrite.sport; + } + + if (NAT_PROTOCOL_TCP == proto) + { + ip_csum_t tcp_sum = tcp->checksum; + tcp_sum = ip_csum_sub_even (tcp_sum, f->l3_csum_delta); + tcp_sum = ip_csum_sub_even (tcp_sum, f->l4_csum_delta); + mss_clamping (sm->mss_clamping, tcp, &tcp_sum); + tcp->checksum = ip_csum_fold (tcp_sum); + } + else if (proto == NAT_PROTOCOL_UDP && udp->checksum) + { + ip_csum_t udp_sum = udp->checksum; + udp_sum = ip_csum_sub_even (udp_sum, f->l3_csum_delta); + udp_sum = ip_csum_sub_even (udp_sum, f->l4_csum_delta); + udp->checksum = ip_csum_fold (udp_sum); + } + } + else + { + if (!is_icmp_inner_ip4) + { // regular case + ip->src_address = f->rewrite.saddr; + ip->dst_address = f->rewrite.daddr; + } + else + { // icmp inner ip4 - reversed saddr/daddr + ip->src_address = f->rewrite.daddr; + ip->dst_address = f->rewrite.saddr; + } + } + + ip_csum_t ip_sum = ip->checksum; + ip_sum = ip_csum_sub_even (ip_sum, f->l3_csum_delta); + ip->checksum = ip_csum_fold (ip_sum); + ASSERT (ip->checksum == ip4_header_checksum (ip)); +} + +static_always_inline int +nat_6t_flow_icmp_translate (snat_main_t *sm, vlib_buffer_t *b, + ip4_header_t *ip, nat_6t_flow_t *f) +{ + if (IP_PROTOCOL_ICMP != ip->protocol) + return NAT_ED_TRNSL_ERR_TRANSLATION_FAILED; + + icmp46_header_t *icmp = ip4_next_header (ip); + icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1); + + if ((!vnet_buffer (b)->ip.reass.is_non_first_fragment)) + { + if (icmp->checksum == 0) + icmp->checksum = 0xffff; + + if (!icmp_type_is_error_message (icmp->type)) + { + if ((f->ops & NAT_FLOW_OP_ICMP_ID_REWRITE) && + (f->rewrite.icmp_id != echo->identifier)) + { + ip_csum_t sum = icmp->checksum; + sum = ip_csum_update (sum, echo->identifier, f->rewrite.icmp_id, + icmp_echo_header_t, + identifier /* changed member */); + echo->identifier = f->rewrite.icmp_id; + icmp->checksum = ip_csum_fold (sum); + } + } + else + { + // errors are not fragmented + ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1); + + if (!ip4_header_checksum_is_valid (inner_ip)) + { + return NAT_ED_TRNSL_ERR_TRANSLATION_FAILED; + } + + nat_protocol_t inner_proto = + ip_proto_to_nat_proto (inner_ip->protocol); + + ip_csum_t icmp_sum = icmp->checksum; + + switch (inner_proto) + { + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + nat_6t_flow_ip4_translate (sm, b, inner_ip, f, inner_proto, + 1 /* is_icmp_inner_ip4 */); + icmp_sum = ip_csum_sub_even (icmp_sum, f->l3_csum_delta); + icmp->checksum = ip_csum_fold (icmp_sum); + break; + case NAT_PROTOCOL_ICMP: + if (f->ops & NAT_FLOW_OP_ICMP_ID_REWRITE) + { + icmp46_header_t *inner_icmp = ip4_next_header (inner_ip); + icmp_echo_header_t *inner_echo = + (icmp_echo_header_t *) (inner_icmp + 1); + if (f->rewrite.icmp_id != inner_echo->identifier) + { + ip_csum_t sum = icmp->checksum; + sum = ip_csum_update ( + sum, inner_echo->identifier, f->rewrite.icmp_id, + icmp_echo_header_t, identifier /* changed member */); + icmp->checksum = ip_csum_fold (sum); + ip_csum_t inner_sum = inner_icmp->checksum; + inner_sum = ip_csum_update ( + sum, inner_echo->identifier, f->rewrite.icmp_id, + icmp_echo_header_t, identifier /* changed member */); + inner_icmp->checksum = ip_csum_fold (inner_sum); + inner_echo->identifier = f->rewrite.icmp_id; + } + } + break; + default: + clib_warning ("unexpected NAT protocol value `%d'", inner_proto); + return NAT_ED_TRNSL_ERR_TRANSLATION_FAILED; + } + } + } + return NAT_ED_TRNSL_ERR_SUCCESS; +} + +nat_translation_error_e +nat_6t_flow_buf_translate (snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip, + nat_6t_flow_t *f, nat_protocol_t proto, + int is_output_feature) +{ + if (!is_output_feature && f->ops & NAT_FLOW_OP_TXFIB_REWRITE) + { + vnet_buffer (b)->sw_if_index[VLIB_TX] = f->rewrite.fib_index; + } + + nat_6t_flow_ip4_translate (sm, b, ip, f, proto, 0 /* is_icmp_inner_ip4 */); + + if (NAT_PROTOCOL_ICMP == proto) + { + return nat_6t_flow_icmp_translate (sm, b, ip, f); + } + + return NAT_ED_TRNSL_ERR_SUCCESS; +} + +u8 * +format_nat_6t (u8 *s, va_list *args) +{ + nat_6t_t *t = va_arg (*args, nat_6t_t *); + + s = format (s, "saddr %U sport %u daddr %U dport %u proto %U fib_idx %u", + format_ip4_address, t->saddr.as_u8, + clib_net_to_host_u16 (t->sport), format_ip4_address, + t->daddr.as_u8, clib_net_to_host_u16 (t->dport), + format_ip_protocol, t->proto, t->fib_index); + return s; +} + +u8 * +format_nat_ed_translation_error (u8 *s, va_list *args) +{ + nat_translation_error_e e = va_arg (*args, nat_translation_error_e); + + switch (e) + { + case NAT_ED_TRNSL_ERR_SUCCESS: + s = format (s, "success"); + break; + case NAT_ED_TRNSL_ERR_TRANSLATION_FAILED: + s = format (s, "translation-failed"); + break; + case NAT_ED_TRNSL_ERR_FLOW_MISMATCH: + s = format (s, "flow-mismatch"); + break; + } + return s; +} + +u8 * +format_nat_6t_flow (u8 *s, va_list *args) +{ + nat_6t_flow_t *f = va_arg (*args, nat_6t_flow_t *); + + s = format (s, "match: %U ", format_nat_6t, &f->match); + int r = 0; + if (f->ops & NAT_FLOW_OP_SADDR_REWRITE) + { + s = format (s, "rewrite: saddr %U ", format_ip4_address, + f->rewrite.saddr.as_u8); + r = 1; + } + if (f->ops & NAT_FLOW_OP_SPORT_REWRITE) + { + if (!r) + { + s = format (s, "rewrite: "); + r = 1; + } + s = format (s, "sport %u ", clib_net_to_host_u16 (f->rewrite.sport)); + } + if (f->ops & NAT_FLOW_OP_DADDR_REWRITE) + { + if (!r) + { + s = format (s, "rewrite: "); + r = 1; + } + s = format (s, "daddr %U ", format_ip4_address, f->rewrite.daddr.as_u8); + } + if (f->ops & NAT_FLOW_OP_DPORT_REWRITE) + { + if (!r) + { + s = format (s, "rewrite: "); + r = 1; + } + s = format (s, "dport %u ", clib_net_to_host_u16 (f->rewrite.dport)); + } + if (f->ops & NAT_FLOW_OP_ICMP_ID_REWRITE) + { + if (!r) + { + s = format (s, "rewrite: "); + r = 1; + } + s = format (s, "icmp-id %u ", clib_net_to_host_u16 (f->rewrite.icmp_id)); + } + if (f->ops & NAT_FLOW_OP_TXFIB_REWRITE) + { + if (!r) + { + s = format (s, "rewrite: "); + r = 1; + } + s = format (s, "txfib %u ", f->rewrite.fib_index); + } + return s; +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |