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/out2in.c | 1585 ---------------------------------------------- 1 file changed, 1585 deletions(-) delete mode 100644 src/plugins/nat/out2in.c (limited to 'src/plugins/nat/out2in.c') diff --git a/src/plugins/nat/out2in.c b/src/plugins/nat/out2in.c deleted file mode 100644 index c8c4542ab83..00000000000 --- a/src/plugins/nat/out2in.c +++ /dev/null @@ -1,1585 +0,0 @@ -/* - * 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 -#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_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_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_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_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_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