diff options
Diffstat (limited to 'plugins/snat-plugin/snat/in2out.c')
| -rw-r--r-- | plugins/snat-plugin/snat/in2out.c | 1597 |
1 files changed, 0 insertions, 1597 deletions
diff --git a/plugins/snat-plugin/snat/in2out.c b/plugins/snat-plugin/snat/in2out.c deleted file mode 100644 index c78fdd76631..00000000000 --- a/plugins/snat-plugin/snat/in2out.c +++ /dev/null @@ -1,1597 +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. - */ - -#include <vlib/vlib.h> -#include <vnet/vnet.h> -#include <vnet/pg/pg.h> -#include <vnet/handoff.h> - -#include <vnet/ip/ip.h> -#include <vnet/ethernet/ethernet.h> -#include <vnet/fib/ip4_fib.h> -#include <snat/snat.h> - -#include <vppinfra/hash.h> -#include <vppinfra/error.h> -#include <vppinfra/elog.h> - -typedef struct { - u32 sw_if_index; - u32 next_index; - u32 session_index; - u32 is_slow_path; -} snat_in2out_trace_t; - -typedef struct { - u32 next_worker_index; - u8 do_handoff; -} snat_in2out_worker_handoff_trace_t; - -/* packet trace format function */ -static u8 * format_snat_in2out_trace (u8 * s, va_list * args) -{ - CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); - CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); - snat_in2out_trace_t * t = va_arg (*args, snat_in2out_trace_t *); - char * tag; - - tag = t->is_slow_path ? "SNAT_IN2OUT_SLOW_PATH" : "SNAT_IN2OUT_FAST_PATH"; - - s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag, - t->sw_if_index, t->next_index, t->session_index); - - return s; -} - -static u8 * format_snat_in2out_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_in2out_trace_t * t = va_arg (*args, snat_in2out_trace_t *); - - s = format (s, "SANT_IN2OUT_FAST: sw_if_index %d, next index %d", - t->sw_if_index, t->next_index); - - return s; -} - -static u8 * format_snat_in2out_worker_handoff_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_in2out_worker_handoff_trace_t * t = - va_arg (*args, snat_in2out_worker_handoff_trace_t *); - char * m; - - m = t->do_handoff ? "next worker" : "same worker"; - s = format (s, "SNAT_IN2OUT_WORKER_HANDOFF: %s %d", m, t->next_worker_index); - - return s; -} - -vlib_node_registration_t snat_in2out_node; -vlib_node_registration_t snat_in2out_slowpath_node; -vlib_node_registration_t snat_in2out_fast_node; -vlib_node_registration_t snat_in2out_worker_handoff_node; - -#define foreach_snat_in2out_error \ -_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ -_(IN2OUT_PACKETS, "Good in2out packets processed") \ -_(OUT_OF_PORTS, "Out of ports") \ -_(BAD_OUTSIDE_FIB, "Outside VRF ID not found") \ -_(BAD_ICMP_TYPE, "icmp type not echo-request") \ -_(NO_TRANSLATION, "No translation") - -typedef enum { -#define _(sym,str) SNAT_IN2OUT_ERROR_##sym, - foreach_snat_in2out_error -#undef _ - SNAT_IN2OUT_N_ERROR, -} snat_in2out_error_t; - -static char * snat_in2out_error_strings[] = { -#define _(sym,string) string, - foreach_snat_in2out_error -#undef _ -}; - -typedef enum { - SNAT_IN2OUT_NEXT_LOOKUP, - SNAT_IN2OUT_NEXT_DROP, - SNAT_IN2OUT_NEXT_SLOW_PATH, - SNAT_IN2OUT_N_NEXT, -} snat_in2out_next_t; - -static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0, - ip4_header_t * ip0, - u32 rx_fib_index0, - snat_session_key_t * key0, - snat_session_t ** sessionp, - vlib_node_runtime_t * node, - u32 next0, - u32 cpu_index) -{ - snat_user_t *u; - snat_user_key_t user_key; - snat_session_t *s; - clib_bihash_kv_8_8_t kv0, value0; - u32 oldest_per_user_translation_list_index; - dlist_elt_t * oldest_per_user_translation_list_elt; - dlist_elt_t * per_user_translation_list_elt; - dlist_elt_t * per_user_list_head_elt; - u32 session_index; - snat_session_key_t key1; - u32 address_index = ~0; - u32 outside_fib_index; - uword * p; - snat_static_mapping_key_t worker_by_out_key; - - p = hash_get (sm->ip4_main->fib_index_by_table_id, sm->outside_vrf_id); - if (! p) - { - b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_OUTSIDE_FIB]; - return SNAT_IN2OUT_NEXT_DROP; - } - outside_fib_index = p[0]; - - user_key.addr = ip0->src_address; - user_key.fib_index = rx_fib_index0; - kv0.key = user_key.as_u64; - - /* Ever heard of the "user" = src ip4 address before? */ - if (clib_bihash_search_8_8 (&sm->user_hash, &kv0, &value0)) - { - /* no, make a new one */ - pool_get (sm->per_thread_data[cpu_index].users, u); - memset (u, 0, sizeof (*u)); - u->addr = ip0->src_address; - - pool_get (sm->per_thread_data[cpu_index].list_pool, per_user_list_head_elt); - - u->sessions_per_user_list_head_index = per_user_list_head_elt - - sm->per_thread_data[cpu_index].list_pool; - - clib_dlist_init (sm->per_thread_data[cpu_index].list_pool, - u->sessions_per_user_list_head_index); - - kv0.value = u - sm->per_thread_data[cpu_index].users; - - /* add user */ - clib_bihash_add_del_8_8 (&sm->user_hash, &kv0, 1 /* is_add */); - } - else - { - u = pool_elt_at_index (sm->per_thread_data[cpu_index].users, - value0.value); - } - - /* Over quota? Recycle the least recently used dynamic translation */ - if (u->nsessions >= sm->max_translations_per_user) - { - /* Remove the oldest dynamic translation */ - do { - oldest_per_user_translation_list_index = - clib_dlist_remove_head (sm->per_thread_data[cpu_index].list_pool, - u->sessions_per_user_list_head_index); - - ASSERT (oldest_per_user_translation_list_index != ~0); - - /* add it back to the end of the LRU list */ - clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool, - u->sessions_per_user_list_head_index, - oldest_per_user_translation_list_index); - /* Get the list element */ - oldest_per_user_translation_list_elt = - pool_elt_at_index (sm->per_thread_data[cpu_index].list_pool, - oldest_per_user_translation_list_index); - - /* Get the session index from the list element */ - session_index = oldest_per_user_translation_list_elt->value; - - /* Get the session */ - s = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions, - session_index); - } while (snat_is_session_static (s)); - - /* Remove in2out, out2in keys */ - kv0.key = s->in2out.as_u64; - if (clib_bihash_add_del_8_8 (&sm->in2out, &kv0, 0 /* is_add */)) - clib_warning ("in2out key delete failed"); - kv0.key = s->out2in.as_u64; - if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 0 /* is_add */)) - clib_warning ("out2in key delete failed"); - - snat_free_outside_address_and_port - (sm, &s->out2in, s->outside_address_index); - s->outside_address_index = ~0; - - if (snat_alloc_outside_address_and_port (sm, &key1, &address_index)) - { - ASSERT(0); - - b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; - return SNAT_IN2OUT_NEXT_DROP; - } - s->outside_address_index = address_index; - } - else - { - u8 static_mapping = 1; - - /* First try to match static mapping by local address and port */ - if (snat_static_mapping_match (sm, *key0, &key1, 0)) - { - static_mapping = 0; - /* Try to create dynamic translation */ - if (snat_alloc_outside_address_and_port (sm, &key1, &address_index)) - { - b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; - return SNAT_IN2OUT_NEXT_DROP; - } - } - - /* Create a new session */ - pool_get (sm->per_thread_data[cpu_index].sessions, s); - memset (s, 0, sizeof (*s)); - - s->outside_address_index = address_index; - - if (static_mapping) - { - u->nstaticsessions++; - s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; - } - else - { - u->nsessions++; - } - - /* Create list elts */ - pool_get (sm->per_thread_data[cpu_index].list_pool, - per_user_translation_list_elt); - clib_dlist_init (sm->per_thread_data[cpu_index].list_pool, - per_user_translation_list_elt - - sm->per_thread_data[cpu_index].list_pool); - - per_user_translation_list_elt->value = - s - sm->per_thread_data[cpu_index].sessions; - s->per_user_index = per_user_translation_list_elt - - sm->per_thread_data[cpu_index].list_pool; - s->per_user_list_head_index = u->sessions_per_user_list_head_index; - - clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool, - s->per_user_list_head_index, - per_user_translation_list_elt - - sm->per_thread_data[cpu_index].list_pool); - } - - s->in2out = *key0; - s->out2in = key1; - s->out2in.protocol = key0->protocol; - s->out2in.fib_index = outside_fib_index; - *sessionp = s; - - /* Add to translation hashes */ - kv0.key = s->in2out.as_u64; - kv0.value = s - sm->per_thread_data[cpu_index].sessions; - if (clib_bihash_add_del_8_8 (&sm->in2out, &kv0, 1 /* is_add */)) - clib_warning ("in2out key add failed"); - - kv0.key = s->out2in.as_u64; - kv0.value = s - sm->per_thread_data[cpu_index].sessions; - - if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 1 /* is_add */)) - clib_warning ("out2in key add failed"); - - /* Add to translated packets worker lookup */ - worker_by_out_key.addr = s->out2in.addr; - worker_by_out_key.port = s->out2in.port; - worker_by_out_key.fib_index = s->out2in.fib_index; - kv0.key = worker_by_out_key.as_u64; - kv0.value = cpu_index; - clib_bihash_add_del_8_8 (&sm->worker_by_out, &kv0, 1); - return next0; -} - -static inline u32 icmp_in2out_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 cpu_index) -{ - snat_session_key_t key0; - icmp_echo_header_t *echo0; - clib_bihash_kv_8_8_t kv0, value0; - snat_session_t * s0; - u32 new_addr0, old_addr0; - u16 old_id0, new_id0; - ip_csum_t sum0; - snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data; - - if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request)) - { - b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; - return SNAT_IN2OUT_NEXT_DROP; - } - - echo0 = (icmp_echo_header_t *)(icmp0+1); - - key0.addr = ip0->src_address; - key0.port = echo0->identifier; - key0.protocol = SNAT_PROTOCOL_ICMP; - key0.fib_index = rx_fib_index0; - - kv0.key = key0.as_u64; - - if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0)) - { - ip4_address_t * first_int_addr; - - if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0)) - { - first_int_addr = - ip4_interface_first_address (sm->ip4_main, sw_if_index0, - 0 /* just want the address */); - rt->cached_sw_if_index = sw_if_index0; - rt->cached_ip4_address = first_int_addr->as_u32; - } - - /* Don't NAT packet aimed at the intfc address */ - if (PREDICT_FALSE(ip0->dst_address.as_u32 == - rt->cached_ip4_address)) - return next0; - - next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, - &s0, node, next0, cpu_index); - - if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) - return next0; - } - else - s0 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions, - value0.value); - - old_addr0 = ip0->src_address.as_u32; - ip0->src_address = s0->out2in.addr; - new_addr0 = ip0->src_address.as_u32; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - src_address /* changed member */); - ip0->checksum = ip_csum_fold (sum0); - - old_id0 = echo0->identifier; - new_id0 = s0->out2in.port; - echo0->identifier = new_id0; - - sum0 = icmp0->checksum; - sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, - identifier); - icmp0->checksum = ip_csum_fold (sum0); - - /* Accounting */ - s0->last_heard = now; - s0->total_pkts++; - s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0); - /* Per-user LRU list maintenance for dynamic translations */ - if (!snat_is_session_static (s0)) - { - clib_dlist_remove (sm->per_thread_data[cpu_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool, - s0->per_user_list_head_index, - s0->per_user_index); - } - - return next0; -} - -/** - * @brief Hairpinning - * - * Hairpinning allows two endpoints on the internal side of the NAT to - * communicate even if they only use each other's external IP addresses - * and ports. - * - * @param sm SNAT main. - * @param b0 Vlib buffer. - * @param ip0 IP header. - * @param udp0 UDP header. - * @param tcp0 TCP header. - * @param proto0 SNAT protocol. - */ -static inline void -snat_hairpinning (snat_main_t *sm, - vlib_buffer_t * b0, - ip4_header_t * ip0, - udp_header_t * udp0, - tcp_header_t * tcp0, - u32 proto0) -{ - snat_session_key_t key0, sm0; - snat_static_mapping_key_t k0; - snat_session_t * s0; - clib_bihash_kv_8_8_t kv0, value0; - ip_csum_t sum0; - u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si; - u16 new_dst_port0, old_dst_port0; - - key0.addr = ip0->dst_address; - key0.port = udp0->dst_port; - key0.protocol = proto0; - key0.fib_index = sm->outside_fib_index; - kv0.key = key0.as_u64; - - /* Check if destination is in active sessions */ - if (clib_bihash_search_8_8 (&sm->out2in, &kv0, &value0)) - { - /* or static mappings */ - if (!snat_static_mapping_match(sm, key0, &sm0, 1)) - { - new_dst_addr0 = sm0.addr.as_u32; - new_dst_port0 = sm0.port; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; - } - } - else - { - si = value0.value; - if (sm->num_workers > 1) - { - k0.addr = ip0->dst_address; - k0.port = udp0->dst_port; - k0.fib_index = sm->outside_fib_index; - kv0.key = k0.as_u64; - if (clib_bihash_search_8_8 (&sm->worker_by_out, &kv0, &value0)) - ASSERT(0); - else - ti = value0.value; - } - else - ti = sm->num_workers; - - s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si); - new_dst_addr0 = s0->in2out.addr.as_u32; - new_dst_port0 = s0->in2out.port; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; - } - - /* Destination is behind the same NAT, use internal address and port */ - if (new_dst_addr0) - { - old_dst_addr0 = ip0->dst_address.as_u32; - ip0->dst_address.as_u32 = new_dst_addr0; - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, - ip4_header_t, dst_address); - ip0->checksum = ip_csum_fold (sum0); - - old_dst_port0 = tcp0->ports.dst; - if (PREDICT_TRUE(new_dst_port0 != old_dst_port0)) - { - if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) - { - tcp0->ports.dst = new_dst_port0; - sum0 = tcp0->checksum; - sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, - ip4_header_t, dst_address); - sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0, - ip4_header_t /* cheat */, length); - tcp0->checksum = ip_csum_fold(sum0); - } - else - { - udp0->dst_port = new_dst_port0; - udp0->checksum = 0; - } - } - } -} - -static inline uword -snat_in2out_node_fn_inline (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame, int is_slow_path) -{ - u32 n_left_from, * from, * to_next; - snat_in2out_next_t next_index; - u32 pkts_processed = 0; - snat_main_t * sm = &snat_main; - snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data; - f64 now = vlib_time_now (vm); - u32 stats_node_index; - u32 cpu_index = os_get_cpu_number (); - - stats_node_index = is_slow_path ? snat_in2out_slowpath_node.index : - snat_in2out_node.index; - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - next_index = node->cached_next_index; - - while (n_left_from > 0) - { - u32 n_left_to_next; - - vlib_get_next_frame (vm, node, next_index, - to_next, n_left_to_next); - - while (n_left_from >= 4 && n_left_to_next >= 2) - { - u32 bi0, bi1; - vlib_buffer_t * b0, * b1; - u32 next0, next1; - u32 sw_if_index0, sw_if_index1; - ip4_header_t * ip0, * ip1; - ip_csum_t sum0, sum1; - u32 new_addr0, old_addr0, new_addr1, old_addr1; - u16 old_port0, new_port0, old_port1, new_port1; - udp_header_t * udp0, * udp1; - tcp_header_t * tcp0, * tcp1; - icmp46_header_t * icmp0, * icmp1; - snat_session_key_t key0, key1; - u32 rx_fib_index0, rx_fib_index1; - u32 proto0, proto1; - snat_session_t * s0 = 0, * s1 = 0; - clib_bihash_kv_8_8_t kv0, value0, kv1, value1; - - /* Prefetch next iteration. */ - { - vlib_buffer_t * p2, * p3; - - p2 = vlib_get_buffer (vm, from[2]); - p3 = vlib_get_buffer (vm, from[3]); - - vlib_prefetch_buffer_header (p2, LOAD); - vlib_prefetch_buffer_header (p3, LOAD); - - CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); - CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); - } - - /* speculatively enqueue b0 and b1 to the current next frame */ - to_next[0] = bi0 = from[0]; - to_next[1] = bi1 = from[1]; - from += 2; - to_next += 2; - n_left_from -= 2; - n_left_to_next -= 2; - - b0 = vlib_get_buffer (vm, bi0); - b1 = vlib_get_buffer (vm, bi1); - - ip0 = vlib_buffer_get_current (b0); - udp0 = ip4_next_header (ip0); - tcp0 = (tcp_header_t *) udp0; - 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); - - next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP; - - proto0 = ~0; - proto0 = (ip0->protocol == IP_PROTOCOL_UDP) - ? SNAT_PROTOCOL_UDP : proto0; - proto0 = (ip0->protocol == IP_PROTOCOL_TCP) - ? SNAT_PROTOCOL_TCP : proto0; - proto0 = (ip0->protocol == IP_PROTOCOL_ICMP) - ? SNAT_PROTOCOL_ICMP : proto0; - - /* Next configured feature, probably ip4-lookup */ - if (is_slow_path) - { - if (PREDICT_FALSE (proto0 == ~0)) - goto trace00; - - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) - { - next0 = icmp_in2out_slow_path - (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, - node, next0, now, cpu_index); - goto trace00; - } - } - else - { - if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP)) - { - next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; - goto trace00; - } - } - - key0.addr = ip0->src_address; - key0.port = udp0->src_port; - key0.protocol = proto0; - key0.fib_index = rx_fib_index0; - - kv0.key = key0.as_u64; - - if (PREDICT_FALSE (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0) != 0)) - { - if (is_slow_path) - { - ip4_address_t * first_int_addr; - - if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0)) - { - first_int_addr = - ip4_interface_first_address (sm->ip4_main, sw_if_index0, - 0 /* just want the address */); - rt->cached_sw_if_index = sw_if_index0; - rt->cached_ip4_address = first_int_addr->as_u32; - } - - /* Don't NAT packet aimed at the intfc address */ - if (PREDICT_FALSE(ip0->dst_address.as_u32 == - rt->cached_ip4_address)) - goto trace00; - - next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, - &s0, node, next0, cpu_index); - if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) - goto trace00; - } - else - { - next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; - goto trace00; - } - } - else - s0 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions, - value0.value); - - old_addr0 = ip0->src_address.as_u32; - ip0->src_address = s0->out2in.addr; - new_addr0 = ip0->src_address.as_u32; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - src_address /* changed member */); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) - { - old_port0 = tcp0->ports.src; - tcp0->ports.src = s0->out2in.port; - new_port0 = tcp0->ports.src; - - 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 - { - old_port0 = udp0->src_port; - udp0->src_port = s0->out2in.port; - udp0->checksum = 0; - } - - /* Hairpinning */ - snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0); - - /* Accounting */ - s0->last_heard = now; - s0->total_pkts++; - s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); - /* Per-user LRU list maintenance for dynamic translation */ - if (!snat_is_session_static (s0)) - { - clib_dlist_remove (sm->per_thread_data[cpu_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool, - s0->per_user_list_head_index, - s0->per_user_index); - } - trace00: - - if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - snat_in2out_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->is_slow_path = is_slow_path; - 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[cpu_index].sessions; - } - - pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP; - - 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); - - proto1 = ~0; - proto1 = (ip1->protocol == IP_PROTOCOL_UDP) - ? SNAT_PROTOCOL_UDP : proto1; - proto1 = (ip1->protocol == IP_PROTOCOL_TCP) - ? SNAT_PROTOCOL_TCP : proto1; - proto1 = (ip1->protocol == IP_PROTOCOL_ICMP) - ? SNAT_PROTOCOL_ICMP : proto1; - - /* Next configured feature, probably ip4-lookup */ - if (is_slow_path) - { - if (PREDICT_FALSE (proto1 == ~0)) - goto trace01; - - if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) - { - next1 = icmp_in2out_slow_path - (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, - next1, now, cpu_index); - goto trace01; - } - } - else - { - if (PREDICT_FALSE (proto1 == ~0 || proto1 == SNAT_PROTOCOL_ICMP)) - { - next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; - goto trace01; - } - } - - key1.addr = ip1->src_address; - key1.port = udp1->src_port; - key1.protocol = proto1; - key1.fib_index = rx_fib_index1; - - kv1.key = key1.as_u64; - - if (PREDICT_FALSE(clib_bihash_search_8_8 (&sm->in2out, &kv1, &value1) != 0)) - { - if (is_slow_path) - { - ip4_address_t * first_int_addr; - - if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index1)) - { - first_int_addr = - ip4_interface_first_address (sm->ip4_main, sw_if_index1, - 0 /* just want the address */); - rt->cached_sw_if_index = sw_if_index1; - rt->cached_ip4_address = first_int_addr->as_u32; - } - - /* Don't NAT packet aimed at the intfc address */ - if (PREDICT_FALSE(ip1->dst_address.as_u32 == - rt->cached_ip4_address)) - goto trace01; - - next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1, - &s1, node, next1, cpu_index); - if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP)) - goto trace01; - } - else - { - next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; - goto trace01; - } - } - else - s1 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions, - value1.value); - - old_addr1 = ip1->src_address.as_u32; - ip1->src_address = s1->out2in.addr; - new_addr1 = ip1->src_address.as_u32; - vnet_buffer(b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index; - - sum1 = ip1->checksum; - sum1 = ip_csum_update (sum1, old_addr1, new_addr1, - ip4_header_t, - src_address /* changed member */); - ip1->checksum = ip_csum_fold (sum1); - - if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP)) - { - old_port1 = tcp1->ports.src; - tcp1->ports.src = s1->out2in.port; - new_port1 = tcp1->ports.src; - - 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); - } - else - { - old_port1 = udp1->src_port; - udp1->src_port = s1->out2in.port; - udp1->checksum = 0; - } - - /* Hairpinning */ - snat_hairpinning (sm, b1, ip1, udp1, tcp1, proto1); - - /* Accounting */ - s1->last_heard = now; - s1->total_pkts++; - s1->total_bytes += vlib_buffer_length_in_chain (vm, b1); - /* Per-user LRU list maintenance for dynamic translation */ - if (!snat_is_session_static (s1)) - { - clib_dlist_remove (sm->per_thread_data[cpu_index].list_pool, - s1->per_user_index); - clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool, - s1->per_user_list_head_index, - s1->per_user_index); - } - trace01: - - if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) - && (b1->flags & VLIB_BUFFER_IS_TRACED))) - { - snat_in2out_trace_t *t = - vlib_add_trace (vm, node, b1, sizeof (*t)); - t->sw_if_index = sw_if_index1; - t->next_index = next1; - t->session_index = ~0; - if (s1) - t->session_index = s1 - sm->per_thread_data[cpu_index].sessions; - } - - pkts_processed += next1 != SNAT_IN2OUT_NEXT_DROP; - - /* verify speculative enqueues, maybe switch current next frame */ - vlib_validate_buffer_enqueue_x2 (vm, node, next_index, - to_next, n_left_to_next, - bi0, bi1, next0, next1); - } - - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t * b0; - u32 next0; - u32 sw_if_index0; - ip4_header_t * ip0; - ip_csum_t sum0; - u32 new_addr0, old_addr0; - u16 old_port0, new_port0; - udp_header_t * udp0; - tcp_header_t * tcp0; - icmp46_header_t * icmp0; - snat_session_key_t key0; - u32 rx_fib_index0; - u32 proto0; - snat_session_t * s0 = 0; - clib_bihash_kv_8_8_t kv0, value0; - - /* speculatively enqueue b0 to the current next frame */ - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; - - b0 = vlib_get_buffer (vm, bi0); - next0 = SNAT_IN2OUT_NEXT_LOOKUP; - - 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 = ~0; - proto0 = (ip0->protocol == IP_PROTOCOL_UDP) - ? SNAT_PROTOCOL_UDP : proto0; - proto0 = (ip0->protocol == IP_PROTOCOL_TCP) - ? SNAT_PROTOCOL_TCP : proto0; - proto0 = (ip0->protocol == IP_PROTOCOL_ICMP) - ? SNAT_PROTOCOL_ICMP : proto0; - - /* Next configured feature, probably ip4-lookup */ - if (is_slow_path) - { - if (PREDICT_FALSE (proto0 == ~0)) - goto trace0; - - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) - { - next0 = icmp_in2out_slow_path - (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, - next0, now, cpu_index); - goto trace0; - } - } - else - { - if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP)) - { - next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; - goto trace0; - } - } - - key0.addr = ip0->src_address; - key0.port = udp0->src_port; - key0.protocol = proto0; - key0.fib_index = rx_fib_index0; - - kv0.key = key0.as_u64; - - if (clib_bihash_search_8_8 (&sm->in2out, &kv0, &value0)) - { - if (is_slow_path) - { - ip4_address_t * first_int_addr; - - if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0)) - { - first_int_addr = - ip4_interface_first_address (sm->ip4_main, sw_if_index0, - 0 /* just want the address */); - rt->cached_sw_if_index = sw_if_index0; - rt->cached_ip4_address = first_int_addr->as_u32; - } - - /* Don't NAT packet aimed at the intfc address */ - if (PREDICT_FALSE(ip0->dst_address.as_u32 == - rt->cached_ip4_address)) - goto trace0; - - next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, - &s0, node, next0, cpu_index); - if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) - goto trace0; - } - else - { - next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; - goto trace0; - } - } - else - s0 = pool_elt_at_index (sm->per_thread_data[cpu_index].sessions, - value0.value); - - old_addr0 = ip0->src_address.as_u32; - ip0->src_address = s0->out2in.addr; - new_addr0 = ip0->src_address.as_u32; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - src_address /* changed member */); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) - { - old_port0 = tcp0->ports.src; - tcp0->ports.src = s0->out2in.port; - new_port0 = tcp0->ports.src; - - 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 - { - old_port0 = udp0->src_port; - udp0->src_port = s0->out2in.port; - udp0->checksum = 0; - } - - /* Hairpinning */ - snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0); - - /* Accounting */ - s0->last_heard = now; - s0->total_pkts++; - s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); - /* Per-user LRU list maintenance for dynamic translation */ - if (!snat_is_session_static (s0)) - { - clib_dlist_remove (sm->per_thread_data[cpu_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[cpu_index].list_pool, - s0->per_user_list_head_index, - s0->per_user_index); - } - - trace0: - if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - snat_in2out_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->is_slow_path = is_slow_path; - 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[cpu_index].sessions; - } - - pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP; - - /* verify speculative enqueue, maybe switch current next frame */ - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, - bi0, next0); - } - - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - vlib_node_increment_counter (vm, stats_node_index, - SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, - pkts_processed); - return frame->n_vectors; -} - -static uword -snat_in2out_fast_path_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */); -} - -VLIB_REGISTER_NODE (snat_in2out_node) = { - .function = snat_in2out_fast_path_fn, - .name = "snat-in2out", - .vector_size = sizeof (u32), - .format_trace = format_snat_in2out_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(snat_in2out_error_strings), - .error_strings = snat_in2out_error_strings, - - .runtime_data_bytes = sizeof (snat_runtime_t), - - .n_next_nodes = SNAT_IN2OUT_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [SNAT_IN2OUT_NEXT_DROP] = "error-drop", - [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", - [SNAT_IN2OUT_NEXT_SLOW_PATH] = "snat-in2out-slowpath", - }, -}; - -VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_node, snat_in2out_fast_path_fn); - -static uword -snat_in2out_slow_path_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */); -} - -VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = { - .function = snat_in2out_slow_path_fn, - .name = "snat-in2out-slowpath", - .vector_size = sizeof (u32), - .format_trace = format_snat_in2out_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(snat_in2out_error_strings), - .error_strings = snat_in2out_error_strings, - - .runtime_data_bytes = sizeof (snat_runtime_t), - - .n_next_nodes = SNAT_IN2OUT_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [SNAT_IN2OUT_NEXT_DROP] = "error-drop", - [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", - [SNAT_IN2OUT_NEXT_SLOW_PATH] = "snat-in2out-slowpath", - }, -}; - -VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_slowpath_node, snat_in2out_slow_path_fn); - -static uword -snat_in2out_worker_handoff_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - snat_main_t *sm = &snat_main; - vlib_thread_main_t *tm = vlib_get_thread_main (); - u32 n_left_from, *from, *to_next = 0; - static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index; - static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index - = 0; - vlib_frame_queue_elt_t *hf = 0; - vlib_frame_t *f = 0; - int i; - u32 n_left_to_next_worker = 0, *to_next_worker = 0; - u32 next_worker_index = 0; - u32 current_worker_index = ~0; - u32 cpu_index = os_get_cpu_number (); - - ASSERT (vec_len (sm->workers)); - - if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0)) - { - vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1); - - vec_validate_init_empty (congested_handoff_queue_by_worker_index, - sm->first_worker_index + sm->num_workers - 1, - (vlib_frame_queue_t *) (~0)); - } - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - - while (n_left_from > 0) - { - u32 bi0; - vlib_buffer_t *b0; - u32 sw_if_index0; - u32 rx_fib_index0; - ip4_header_t * ip0; - snat_user_key_t key0; - clib_bihash_kv_8_8_t kv0, value0; - u8 do_handoff; - - bi0 = from[0]; - from += 1; - n_left_from -= 1; - - b0 = vlib_get_buffer (vm, bi0); - - 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); - - ip0 = vlib_buffer_get_current (b0); - - key0.addr = ip0->src_address; - key0.fib_index = rx_fib_index0; - - kv0.key = key0.as_u64; - - /* Ever heard of of the "user" before? */ - if (clib_bihash_search_8_8 (&sm->worker_by_in, &kv0, &value0)) - { - /* No, assign next available worker (RR) */ - next_worker_index = sm->first_worker_index + - sm->workers[sm->next_worker++ % vec_len (sm->workers)]; - - /* add non-traslated packets worker lookup */ - kv0.value = next_worker_index; - clib_bihash_add_del_8_8 (&sm->worker_by_in, &kv0, 1); - } - else - next_worker_index = value0.value; - - if (PREDICT_FALSE (next_worker_index != cpu_index)) - { - do_handoff = 1; - - if (next_worker_index != current_worker_index) - { - if (hf) - hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; - - hf = vlib_get_worker_handoff_queue_elt (sm->fq_in2out_index, - next_worker_index, - handoff_queue_elt_by_worker_index); - - n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors; - to_next_worker = &hf->buffer_index[hf->n_vectors]; - current_worker_index = next_worker_index; - } - - /* enqueue to correct worker thread */ - to_next_worker[0] = bi0; - to_next_worker++; - n_left_to_next_worker--; - - if (n_left_to_next_worker == 0) - { - hf->n_vectors = VLIB_FRAME_SIZE; - vlib_put_frame_queue_elt (hf); - current_worker_index = ~0; - handoff_queue_elt_by_worker_index[next_worker_index] = 0; - hf = 0; - } - } - else - { - do_handoff = 0; - /* if this is 1st frame */ - if (!f) - { - f = vlib_get_frame_to_node (vm, snat_in2out_node.index); - to_next = vlib_frame_vector_args (f); - } - - to_next[0] = bi0; - to_next += 1; - f->n_vectors++; - } - - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - snat_in2out_worker_handoff_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->next_worker_index = next_worker_index; - t->do_handoff = do_handoff; - } - } - - if (f) - vlib_put_frame_to_node (vm, snat_in2out_node.index, f); - - if (hf) - hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; - - /* Ship frames to the worker nodes */ - for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++) - { - if (handoff_queue_elt_by_worker_index[i]) - { - hf = handoff_queue_elt_by_worker_index[i]; - /* - * It works better to let the handoff node - * rate-adapt, always ship the handoff queue element. - */ - if (1 || hf->n_vectors == hf->last_n_vectors) - { - vlib_put_frame_queue_elt (hf); - handoff_queue_elt_by_worker_index[i] = 0; - } - else - hf->last_n_vectors = hf->n_vectors; - } - congested_handoff_queue_by_worker_index[i] = - (vlib_frame_queue_t *) (~0); - } - hf = 0; - current_worker_index = ~0; - return frame->n_vectors; -} - -VLIB_REGISTER_NODE (snat_in2out_worker_handoff_node) = { - .function = snat_in2out_worker_handoff_fn, - .name = "snat-in2out-worker-handoff", - .vector_size = sizeof (u32), - .format_trace = format_snat_in2out_worker_handoff_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_next_nodes = 1, - - .next_nodes = { - [0] = "error-drop", - }, -}; - -VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_worker_handoff_node, snat_in2out_worker_handoff_fn); - -static inline u32 icmp_in2out_static_map (snat_main_t *sm, - vlib_buffer_t * b0, - ip4_header_t * ip0, - icmp46_header_t * icmp0, - u32 sw_if_index0, - vlib_node_runtime_t * node, - u32 next0, - u32 rx_fib_index0) -{ - snat_session_key_t key0, sm0; - icmp_echo_header_t *echo0; - u32 new_addr0, old_addr0; - u16 old_id0, new_id0; - ip_csum_t sum0; - snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data; - - echo0 = (icmp_echo_header_t *)(icmp0+1); - - key0.addr = ip0->src_address; - key0.port = echo0->identifier; - key0.fib_index = rx_fib_index0; - - if (snat_static_mapping_match(sm, key0, &sm0, 0)) - { - ip4_address_t * first_int_addr; - - if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0)) - { - first_int_addr = - ip4_interface_first_address (sm->ip4_main, sw_if_index0, - 0 /* just want the address */); - rt->cached_sw_if_index = sw_if_index0; - rt->cached_ip4_address = first_int_addr->as_u32; - } - - /* Don't NAT packet aimed at the intfc address */ - if (PREDICT_FALSE(ip0->dst_address.as_u32 == - rt->cached_ip4_address)) - return next0; - - b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; - return SNAT_IN2OUT_NEXT_DROP; - } - - new_addr0 = sm0.addr.as_u32; - new_id0 = sm0.port; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; - old_addr0 = ip0->src_address.as_u32; - ip0->src_address.as_u32 = new_addr0; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - src_address /* changed member */); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_FALSE(new_id0 != echo0->identifier)) - { - old_id0 = echo0->identifier; - 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); - } - - return next0; -} - -static uword -snat_in2out_fast_static_map_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 n_left_from, * from, * to_next; - snat_in2out_next_t next_index; - u32 pkts_processed = 0; - snat_main_t * sm = &snat_main; - snat_runtime_t * rt = (snat_runtime_t *)node->runtime_data; - u32 stats_node_index; - - stats_node_index = snat_in2out_fast_node.index; - - from = vlib_frame_vector_args (frame); - n_left_from = frame->n_vectors; - next_index = node->cached_next_index; - - while (n_left_from > 0) - { - u32 n_left_to_next; - - vlib_get_next_frame (vm, node, next_index, - to_next, n_left_to_next); - - while (n_left_from > 0 && n_left_to_next > 0) - { - u32 bi0; - vlib_buffer_t * b0; - u32 next0; - u32 sw_if_index0; - ip4_header_t * ip0; - ip_csum_t sum0; - u32 new_addr0, old_addr0; - u16 old_port0, new_port0; - udp_header_t * udp0; - tcp_header_t * tcp0; - icmp46_header_t * icmp0; - snat_session_key_t key0, sm0; - u32 proto0; - u32 rx_fib_index0; - - /* speculatively enqueue b0 to the current next frame */ - bi0 = from[0]; - to_next[0] = bi0; - from += 1; - to_next += 1; - n_left_from -= 1; - n_left_to_next -= 1; - - b0 = vlib_get_buffer (vm, bi0); - next0 = SNAT_IN2OUT_NEXT_LOOKUP; - - 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); - - proto0 = ~0; - proto0 = (ip0->protocol == IP_PROTOCOL_UDP) - ? SNAT_PROTOCOL_UDP : proto0; - proto0 = (ip0->protocol == IP_PROTOCOL_TCP) - ? SNAT_PROTOCOL_TCP : proto0; - proto0 = (ip0->protocol == IP_PROTOCOL_ICMP) - ? SNAT_PROTOCOL_ICMP : proto0; - - if (PREDICT_FALSE (proto0 == ~0)) - goto trace0; - - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) - { - ip4_address_t * first_int_addr; - - if (PREDICT_FALSE(rt->cached_sw_if_index != sw_if_index0)) - { - first_int_addr = - ip4_interface_first_address (sm->ip4_main, sw_if_index0, - 0 /* just want the address */); - rt->cached_sw_if_index = sw_if_index0; - rt->cached_ip4_address = first_int_addr->as_u32; - } - - /* Don't NAT packet aimed at the intfc address */ - if (PREDICT_FALSE(ip0->dst_address.as_u32 == - rt->cached_ip4_address)) - goto trace0; - - next0 = icmp_in2out_static_map - (sm, b0, ip0, icmp0, sw_if_index0, node, next0, rx_fib_index0); - goto trace0; - } - - key0.addr = ip0->src_address; - key0.port = udp0->src_port; - key0.fib_index = rx_fib_index0; - - if (snat_static_mapping_match(sm, key0, &sm0, 0)) - { - b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; - next0= SNAT_IN2OUT_NEXT_DROP; - goto trace0; - } - - new_addr0 = sm0.addr.as_u32; - new_port0 = sm0.port; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; - old_addr0 = ip0->src_address.as_u32; - ip0->src_address.as_u32 = new_addr0; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0, new_addr0, - ip4_header_t, - src_address /* changed member */); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_FALSE(new_port0 != udp0->dst_port)) - { - if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) - { - old_port0 = tcp0->ports.src; - tcp0->ports.src = new_port0; - - 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 - { - old_port0 = udp0->src_port; - udp0->src_port = new_port0; - udp0->checksum = 0; - } - } - else - { - if (PREDICT_TRUE(proto0 == SNAT_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); - } - } - - /* Hairpinning */ - snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0); - - trace0: - if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - snat_in2out_trace_t *t = - vlib_add_trace (vm, node, b0, sizeof (*t)); - t->sw_if_index = sw_if_index0; - t->next_index = next0; - } - - pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP; - - /* verify speculative enqueue, maybe switch current next frame */ - vlib_validate_buffer_enqueue_x1 (vm, node, next_index, - to_next, n_left_to_next, - bi0, next0); - } - - vlib_put_next_frame (vm, node, next_index, n_left_to_next); - } - - vlib_node_increment_counter (vm, stats_node_index, - SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, - pkts_processed); - return frame->n_vectors; -} - - -VLIB_REGISTER_NODE (snat_in2out_fast_node) = { - .function = snat_in2out_fast_static_map_fn, - .name = "snat-in2out-fast", - .vector_size = sizeof (u32), - .format_trace = format_snat_in2out_fast_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_errors = ARRAY_LEN(snat_in2out_error_strings), - .error_strings = snat_in2out_error_strings, - - .runtime_data_bytes = sizeof (snat_runtime_t), - - .n_next_nodes = SNAT_IN2OUT_N_NEXT, - - /* edit / add dispositions here */ - .next_nodes = { - [SNAT_IN2OUT_NEXT_DROP] = "error-drop", - [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", - [SNAT_IN2OUT_NEXT_SLOW_PATH] = "snat-in2out-slowpath", - }, -}; - -VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_fast_node, snat_in2out_fast_static_map_fn); |