+++ /dev/null
-/*
- * 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);
Code Review / vpp.git / blobdiff