diff options
Diffstat (limited to 'src/plugins/snat/out2in.c')
| -rw-r--r-- | src/plugins/snat/out2in.c | 2294 |
1 files changed, 0 insertions, 2294 deletions
diff --git a/src/plugins/snat/out2in.c b/src/plugins/snat/out2in.c deleted file mode 100644 index 329d67dc3bf..00000000000 --- a/src/plugins/snat/out2in.c +++ /dev/null @@ -1,2294 +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/udp/udp.h> -#include <vnet/ethernet/ethernet.h> -#include <vnet/fib/ip4_fib.h> -#include <snat/snat.h> -#include <snat/snat_ipfix_logging.h> -#include <snat/snat_det.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; -} snat_out2in_trace_t; - -typedef struct { - u32 next_worker_index; - u8 do_handoff; -} snat_out2in_worker_handoff_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, "SNAT_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, "SNAT_OUT2IN_FAST: sw_if_index %d, next index %d", - t->sw_if_index, t->next_index); - return s; -} - -static u8 * format_snat_out2in_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_out2in_worker_handoff_trace_t * t = - va_arg (*args, snat_out2in_worker_handoff_trace_t *); - char * m; - - m = t->do_handoff ? "next worker" : "same worker"; - s = format (s, "SNAT_OUT2IN_WORKER_HANDOFF: %s %d", m, t->next_worker_index); - - return s; -} - -vlib_node_registration_t snat_out2in_node; -vlib_node_registration_t snat_out2in_fast_node; -vlib_node_registration_t snat_out2in_worker_handoff_node; -vlib_node_registration_t snat_det_out2in_node; - -#define foreach_snat_out2in_error \ -_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ -_(OUT2IN_PACKETS, "Good out2in packets processed") \ -_(BAD_ICMP_TYPE, "unsupported ICMP type") \ -_(NO_TRANSLATION, "No translation") - -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; - -/** - * @brief Create session for static mapping. - * - * Create NAT session initiated by host from external network with static - * mapping. - * - * @param sm SNAT main. - * @param b0 Vlib buffer. - * @param in2out In2out SNAT session key. - * @param out2in Out2in SNAT 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, - snat_session_key_t in2out, - snat_session_key_t out2in, - vlib_node_runtime_t * node, - u32 thread_index) -{ - snat_user_t *u; - snat_user_key_t user_key; - snat_session_t *s; - clib_bihash_kv_8_8_t kv0, value0; - dlist_elt_t * per_user_translation_list_elt; - dlist_elt_t * per_user_list_head_elt; - ip4_header_t *ip0; - - ip0 = vlib_buffer_get_current (b0); - - user_key.addr = in2out.addr; - user_key.fib_index = in2out.fib_index; - kv0.key = user_key.as_u64; - - /* Ever heard of the "user" = inside 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[thread_index].users, u); - memset (u, 0, sizeof (*u)); - u->addr = in2out.addr; - u->fib_index = in2out.fib_index; - - pool_get (sm->per_thread_data[thread_index].list_pool, - per_user_list_head_elt); - - u->sessions_per_user_list_head_index = per_user_list_head_elt - - sm->per_thread_data[thread_index].list_pool; - - clib_dlist_init (sm->per_thread_data[thread_index].list_pool, - u->sessions_per_user_list_head_index); - - kv0.value = u - sm->per_thread_data[thread_index].users; - - /* add user */ - clib_bihash_add_del_8_8 (&sm->user_hash, &kv0, 1 /* is_add */); - - /* add non-traslated packets worker lookup */ - kv0.value = thread_index; - clib_bihash_add_del_8_8 (&sm->worker_by_in, &kv0, 1); - } - else - { - u = pool_elt_at_index (sm->per_thread_data[thread_index].users, - value0.value); - } - - pool_get (sm->per_thread_data[thread_index].sessions, s); - memset (s, 0, sizeof (*s)); - - s->outside_address_index = ~0; - s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; - s->ext_host_addr.as_u32 = ip0->dst_address.as_u32; - u->nstaticsessions++; - - /* Create list elts */ - pool_get (sm->per_thread_data[thread_index].list_pool, - per_user_translation_list_elt); - clib_dlist_init (sm->per_thread_data[thread_index].list_pool, - per_user_translation_list_elt - - sm->per_thread_data[thread_index].list_pool); - - per_user_translation_list_elt->value = - s - sm->per_thread_data[thread_index].sessions; - s->per_user_index = - per_user_translation_list_elt - sm->per_thread_data[thread_index].list_pool; - s->per_user_list_head_index = u->sessions_per_user_list_head_index; - - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s->per_user_list_head_index, - per_user_translation_list_elt - - sm->per_thread_data[thread_index].list_pool); - - s->in2out = in2out; - s->out2in = out2in; - s->in2out.protocol = out2in.protocol; - - /* Add to translation hashes */ - kv0.key = s->in2out.as_u64; - kv0.value = s - sm->per_thread_data[thread_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[thread_index].sessions; - - if (clib_bihash_add_del_8_8 (&sm->out2in, &kv0, 1 /* is_add */)) - clib_warning ("out2in key add failed"); - - /* log NAT event */ - snat_ipfix_logging_nat44_ses_create(s->in2out.addr.as_u32, - s->out2in.addr.as_u32, - s->in2out.protocol, - s->in2out.port, - s->out2in.port, - s->in2out.fib_index); - return s; -} - -static_always_inline -snat_out2in_error_t icmp_get_key(ip4_header_t *ip0, - snat_session_key_t *p_key0) -{ - icmp46_header_t *icmp0; - snat_session_key_t key0; - 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_is_error_message (icmp0)) - { - key0.protocol = SNAT_PROTOCOL_ICMP; - key0.addr = ip0->dst_address; - key0.port = echo0->identifier; - } - else - { - inner_ip0 = (ip4_header_t *)(echo0+1); - l4_header = ip4_next_header (inner_ip0); - key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol); - key0.addr = inner_ip0->src_address; - switch (key0.protocol) - { - case SNAT_PROTOCOL_ICMP: - inner_icmp0 = (icmp46_header_t*)l4_header; - inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1); - key0.port = inner_echo0->identifier; - break; - case SNAT_PROTOCOL_UDP: - case SNAT_PROTOCOL_TCP: - key0.port = ((tcp_udp_header_t*)l4_header)->src_port; - break; - default: - return SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL; - } - } - *p_key0 = key0; - return -1; /* success */ -} - -/** - * Get address and port values to be used for packet SNAT translation - * and create session if needed - * - * @param[in,out] sm SNAT main - * @param[in,out] node SNAT node runtime - * @param[in] thread_index thread index - * @param[in,out] b0 buffer containing packet to be translated - * @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, u8 *p_proto, - snat_session_key_t *p_value, - u8 *p_dont_translate, void *d, void *e) -{ - ip4_header_t *ip0; - icmp46_header_t *icmp0; - u32 sw_if_index0; - u32 rx_fib_index0; - snat_session_key_t key0; - snat_session_key_t sm0; - snat_session_t *s0 = 0; - u8 dont_translate = 0; - clib_bihash_kv_8_8_t kv0, value0; - u8 is_addr_only; - u32 next0 = ~0; - int err; - - ip0 = vlib_buffer_get_current (b0); - icmp0 = (icmp46_header_t *) ip4_next_header (ip0); - 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); - - key0.protocol = 0; - - err = icmp_get_key (ip0, &key0); - if (err != -1) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - key0.fib_index = rx_fib_index0; - - kv0.key = key0.as_u64; - - if (clib_bihash_search_8_8 (&sm->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, key0, &sm0, 1, &is_addr_only)) - { - /* 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; - } - - if (PREDICT_FALSE(icmp0->type != ICMP4_echo_reply && - (icmp0->type != ICMP4_echo_request || !is_addr_only))) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - - /* Create session initiated by host from external network */ - s0 = create_session_for_static_mapping(sm, b0, sm0, key0, - node, thread_index); - - if (!s0) - { - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - } - else - { - if (PREDICT_FALSE(icmp0->type != ICMP4_echo_reply && - icmp0->type != ICMP4_echo_request && - !icmp_is_error_message (icmp0))) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - - s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, - value0.value); - } - -out: - *p_proto = key0.protocol; - if (s0) - *p_value = s0->in2out; - *p_dont_translate = dont_translate; - if (d) - *(snat_session_t**)d = s0; - return next0; -} - -/** - * Get address and port values to be used for packet SNAT translation - * - * @param[in] sm SNAT main - * @param[in,out] node SNAT node runtime - * @param[in] thread_index thread index - * @param[in,out] b0 buffer containing packet to be translated - * @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, u8 *p_proto, - snat_session_key_t *p_value, - u8 *p_dont_translate, void *d, void *e) -{ - ip4_header_t *ip0; - icmp46_header_t *icmp0; - u32 sw_if_index0; - u32 rx_fib_index0; - snat_session_key_t key0; - snat_session_key_t sm0; - u8 dont_translate = 0; - u8 is_addr_only; - u32 next0 = ~0; - int err; - - ip0 = vlib_buffer_get_current (b0); - icmp0 = (icmp46_header_t *) ip4_next_header (ip0); - 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 (ip0, &key0); - if (err != -1) - { - b0->error = node->errors[err]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out2; - } - key0.fib_index = rx_fib_index0; - - if (snat_static_mapping_match(sm, key0, &sm0, 1, &is_addr_only)) - { - /* 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(icmp0->type != ICMP4_echo_reply && - (icmp0->type != ICMP4_echo_request || !is_addr_only) && - !icmp_is_error_message (icmp0))) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - -out: - *p_value = sm0; -out2: - *p_proto = key0.protocol; - *p_dont_translate = dont_translate; - return next0; -} - -static inline 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) -{ - snat_session_key_t sm0; - u8 protocol; - 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; - - echo0 = (icmp_echo_header_t *)(icmp0+1); - - next0_tmp = sm->icmp_match_out2in_cb(sm, node, thread_index, b0, - &protocol, &sm0, &dont_translate, d, e); - if (next0_tmp != ~0) - next0 = next0_tmp; - if (next0 == SNAT_OUT2IN_NEXT_DROP || dont_translate) - goto out; - - sum0 = ip_incremental_checksum (0, icmp0, - ntohs(ip0->length) - ip4_header_bytes (ip0)); - 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 = sm0.addr.as_u32; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.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 (!icmp_is_error_message (icmp0)) - { - new_id0 = sm0.port; - if (PREDICT_FALSE(new_id0 != echo0->identifier)) - { - old_id0 = echo0->identifier; - new_id0 = sm0.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 = sm0.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 (protocol) - { - case SNAT_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 = sm0.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 SNAT_PROTOCOL_UDP: - case SNAT_PROTOCOL_TCP: - old_id0 = ((tcp_udp_header_t*)l4_header)->src_port; - new_id0 = sm0.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; -} - - -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) -{ - 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 */ - 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 translation */ - if (!snat_is_session_static (s0)) - { - clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s0->per_user_list_head_index, - s0->per_user_index); - } - } - return next0; -} - -static void -snat_out2in_unknown_proto (snat_main_t *sm, - vlib_buffer_t * b, - ip4_header_t * ip, - u32 rx_fib_index, - u32 thread_index, - f64 now, - vlib_main_t * vm) -{ - clib_bihash_kv_8_8_t kv, value; - clib_bihash_kv_16_8_t s_kv, s_value; - snat_static_mapping_t *m; - snat_session_key_t m_key; - u32 old_addr, new_addr; - ip_csum_t sum; - snat_unk_proto_ses_key_t key; - snat_session_t * s; - snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; - snat_user_key_t u_key; - snat_user_t *u; - dlist_elt_t *head, *elt; - - old_addr = ip->dst_address.as_u32; - - key.l_addr = ip->dst_address; - key.r_addr = ip->src_address; - key.fib_index = rx_fib_index; - key.proto = ip->protocol; - key.rsvd[0] = key.rsvd[1] = key.rsvd[2] = 0; - s_kv.key[0] = key.as_u64[0]; - s_kv.key[1] = key.as_u64[1]; - - if (!clib_bihash_search_16_8 (&sm->out2in_unk_proto, &s_kv, &s_value)) - { - s = pool_elt_at_index (tsm->sessions, s_value.value); - new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32; - } - else - { - m_key.addr = ip->dst_address; - m_key.port = 0; - m_key.protocol = 0; - m_key.fib_index = rx_fib_index; - kv.key = m_key.as_u64; - if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) - return; - - m = pool_elt_at_index (sm->static_mappings, value.value); - - new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32; - - u_key.addr = ip->src_address; - u_key.fib_index = m->fib_index; - kv.key = u_key.as_u64; - - /* Ever heard of the "user" = src ip4 address before? */ - if (clib_bihash_search_8_8 (&sm->user_hash, &kv, &value)) - { - /* no, make a new one */ - pool_get (tsm->users, u); - memset (u, 0, sizeof (*u)); - u->addr = ip->src_address; - u->fib_index = rx_fib_index; - - pool_get (tsm->list_pool, head); - u->sessions_per_user_list_head_index = head - tsm->list_pool; - - clib_dlist_init (tsm->list_pool, - u->sessions_per_user_list_head_index); - - kv.value = u - tsm->users; - - /* add user */ - clib_bihash_add_del_8_8 (&sm->user_hash, &kv, 1); - } - else - { - u = pool_elt_at_index (tsm->users, value.value); - } - - /* Create a new session */ - pool_get (tsm->sessions, s); - memset (s, 0, sizeof (*s)); - - s->ext_host_addr.as_u32 = ip->src_address.as_u32; - s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO; - s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; - s->outside_address_index = ~0; - s->out2in.addr.as_u32 = old_addr; - s->out2in.fib_index = rx_fib_index; - s->in2out.addr.as_u32 = new_addr; - s->in2out.fib_index = m->fib_index; - s->in2out.port = s->out2in.port = ip->protocol; - u->nstaticsessions++; - - /* Create list elts */ - pool_get (tsm->list_pool, elt); - clib_dlist_init (tsm->list_pool, elt - tsm->list_pool); - elt->value = s - tsm->sessions; - s->per_user_index = elt - tsm->list_pool; - s->per_user_list_head_index = u->sessions_per_user_list_head_index; - clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, - s->per_user_index); - - /* Add to lookup tables */ - s_kv.value = s - tsm->sessions; - if (clib_bihash_add_del_16_8 (&sm->out2in_unk_proto, &s_kv, 1)) - clib_warning ("out2in key add failed"); - - key.l_addr = ip->dst_address; - key.fib_index = m->fib_index; - s_kv.key[0] = key.as_u64[0]; - s_kv.key[1] = key.as_u64[1]; - if (clib_bihash_add_del_16_8 (&sm->in2out_unk_proto, &s_kv, 1)) - clib_warning ("in2out key add failed"); - } - - /* Update IP checksum */ - 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] = s->in2out.fib_index; - - /* Accounting */ - s->last_heard = now; - s->total_pkts++; - s->total_bytes += vlib_buffer_length_in_chain (vm, b); - /* Per-user LRU list maintenance */ - clib_dlist_remove (tsm->list_pool, s->per_user_index); - clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, - s->per_user_index); -} - -static uword -snat_out2in_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 n_left_from, * from, * to_next; - snat_out2in_next_t next_index; - u32 pkts_processed = 0; - snat_main_t * sm = &snat_main; - f64 now = vlib_time_now (vm); - u32 thread_index = vlib_get_thread_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 = 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; - snat_session_key_t key0, key1, sm0, sm1; - 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; - - /* 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); - - 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_snat_proto (ip0->protocol); - - if (PREDICT_FALSE (proto0 == ~0)) - { - snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0, - thread_index, now, vm); - goto trace0; - } - - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) - { - next0 = icmp_out2in_slow_path - (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, - next0, now, thread_index, &s0); - goto trace0; - } - - key0.addr = ip0->dst_address; - key0.port = udp0->dst_port; - key0.protocol = proto0; - key0.fib_index = rx_fib_index0; - - kv0.key = key0.as_u64; - - if (clib_bihash_search_8_8 (&sm->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, key0, &sm0, 1, 0)) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - /* - * Send DHCP packets to the ipv4 stack, or we won't - * be able to use dhcp client on the outside interface - */ - if (proto0 != SNAT_PROTOCOL_UDP - || (udp0->dst_port - != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client))) - next0 = SNAT_OUT2IN_NEXT_DROP; - goto trace0; - } - - /* Create session initiated by host from external network */ - s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node, - thread_index); - if (!s0) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto trace0; - } - } - 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 == SNAT_PROTOCOL_TCP)) - { - old_port0 = tcp0->dst_port; - tcp0->dst_port = s0->in2out.port; - new_port0 = tcp0->dst_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); - } - else - { - old_port0 = udp0->dst_port; - udp0->dst_port = s0->in2out.port; - udp0->checksum = 0; - } - - /* 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[thread_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_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_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; - } - - pkts_processed += next0 != SNAT_OUT2IN_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); - - 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_snat_proto (ip1->protocol); - - if (PREDICT_FALSE (proto1 == ~0)) - { - snat_out2in_unknown_proto(sm, b1, ip1, rx_fib_index1, - thread_index, now, vm); - goto trace1; - } - - if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) - { - next1 = icmp_out2in_slow_path - (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, - next1, now, thread_index, &s1); - goto trace1; - } - - key1.addr = ip1->dst_address; - key1.port = udp1->dst_port; - key1.protocol = proto1; - key1.fib_index = rx_fib_index1; - - kv1.key = key1.as_u64; - - if (clib_bihash_search_8_8 (&sm->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, key1, &sm1, 1, 0)) - { - b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - /* - * Send DHCP packets to the ipv4 stack, or we won't - * be able to use dhcp client on the outside interface - */ - if (proto1 != SNAT_PROTOCOL_UDP - || (udp1->dst_port - != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client))) - next1 = SNAT_OUT2IN_NEXT_DROP; - goto trace1; - } - - /* Create session initiated by host from external network */ - s1 = create_session_for_static_mapping(sm, b1, sm1, key1, node, - thread_index); - if (!s1) - { - b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - 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 == SNAT_PROTOCOL_TCP)) - { - old_port1 = tcp1->dst_port; - tcp1->dst_port = s1->in2out.port; - new_port1 = tcp1->dst_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); - } - else - { - old_port1 = udp1->dst_port; - udp1->dst_port = s1->in2out.port; - udp1->checksum = 0; - } - - /* 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[thread_index].list_pool, - s1->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, - s1->per_user_list_head_index, - s1->per_user_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; - } - - pkts_processed += next1 != SNAT_OUT2IN_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 = 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; - snat_session_key_t key0, sm0; - 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); - - 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_snat_proto (ip0->protocol); - - if (PREDICT_FALSE (proto0 == ~0)) - { - snat_out2in_unknown_proto(sm, b0, ip0, rx_fib_index0, - thread_index, now, vm); - 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 == SNAT_PROTOCOL_ICMP)) - { - next0 = icmp_out2in_slow_path - (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, - next0, now, thread_index, &s0); - goto trace00; - } - - key0.addr = ip0->dst_address; - key0.port = udp0->dst_port; - key0.protocol = proto0; - key0.fib_index = rx_fib_index0; - - kv0.key = key0.as_u64; - - if (clib_bihash_search_8_8 (&sm->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, key0, &sm0, 1, 0)) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - /* - * Send DHCP packets to the ipv4 stack, or we won't - * be able to use dhcp client on the outside interface - */ - if (proto0 != SNAT_PROTOCOL_UDP - || (udp0->dst_port - != clib_host_to_net_u16(UDP_DST_PORT_dhcp_to_client))) - - next0 = SNAT_OUT2IN_NEXT_DROP; - goto trace00; - } - - /* Create session initiated by host from external network */ - s0 = create_session_for_static_mapping(sm, b0, sm0, key0, node, - thread_index); - if (!s0) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - 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 == SNAT_PROTOCOL_TCP)) - { - old_port0 = tcp0->dst_port; - tcp0->dst_port = s0->in2out.port; - new_port0 = tcp0->dst_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); - } - else - { - old_port0 = udp0->dst_port; - udp0->dst_port = s0->in2out.port; - udp0->checksum = 0; - } - - /* 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[thread_index].list_pool, - s0->per_user_index); - clib_dlist_addtail (sm->per_thread_data[thread_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_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; - } - - pkts_processed += next0 != SNAT_OUT2IN_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, snat_out2in_node.index, - SNAT_OUT2IN_ERROR_OUT2IN_PACKETS, - pkts_processed); - return frame->n_vectors; -} - -VLIB_REGISTER_NODE (snat_out2in_node) = { - .function = snat_out2in_node_fn, - .name = "snat-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", - }, -}; -VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn); - -/**************************/ -/*** deterministic mode ***/ -/**************************/ -static uword -snat_det_out2in_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 n_left_from, * from, * to_next; - snat_out2in_next_t next_index; - u32 pkts_processed = 0; - snat_main_t * sm = &snat_main; - u32 thread_index = vlib_get_thread_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 = 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; - ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1; - u16 new_port0, old_port0, old_port1, new_port1; - udp_header_t * udp0, * udp1; - tcp_header_t * tcp0, * tcp1; - u32 proto0, proto1; - snat_det_out_key_t key0, key1; - snat_det_map_t * dm0, * dm1; - snat_det_session_t * ses0 = 0, * ses1 = 0; - u32 rx_fib_index0, rx_fib_index1; - icmp46_header_t * icmp0, * icmp1; - - /* 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; - - sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; - - 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_snat_proto (ip0->protocol); - - if (PREDICT_FALSE(proto0 == SNAT_PROTOCOL_ICMP)) - { - rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0); - icmp0 = (icmp46_header_t *) udp0; - - next0 = icmp_out2in(sm, b0, ip0, icmp0, sw_if_index0, - rx_fib_index0, node, next0, thread_index, - &ses0, &dm0); - goto trace0; - } - - key0.ext_host_addr = ip0->src_address; - key0.ext_host_port = tcp0->src; - key0.out_port = tcp0->dst; - - dm0 = snat_det_map_by_out(sm, &ip0->dst_address); - if (PREDICT_FALSE(!dm0)) - { - clib_warning("unknown dst address: %U", - format_ip4_address, &ip0->dst_address); - next0 = SNAT_OUT2IN_NEXT_DROP; - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - goto trace0; - } - - snat_det_reverse(dm0, &ip0->dst_address, - clib_net_to_host_u16(tcp0->dst), &new_addr0); - - ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64); - if (PREDICT_FALSE(!ses0)) - { - clib_warning("no match src %U:%d dst %U:%d for user %U", - format_ip4_address, &ip0->src_address, - clib_net_to_host_u16 (tcp0->src), - format_ip4_address, &ip0->dst_address, - clib_net_to_host_u16 (tcp0->dst), - format_ip4_address, &new_addr0); - next0 = SNAT_OUT2IN_NEXT_DROP; - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - goto trace0; - } - new_port0 = ses0->in_port; - - old_addr0 = ip0->dst_address; - ip0->dst_address = new_addr0; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, - ip4_header_t, - dst_address /* changed member */); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) - { - if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED) - ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT; - else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_LAST_ACK) - snat_det_ses_close(dm0, ses0); - - old_port0 = tcp0->dst; - tcp0->dst = new_port0; - - sum0 = tcp0->checksum; - sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, - 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->dst_port; - udp0->dst_port = new_port0; - udp0->checksum = 0; - } - - 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 (ses0) - t->session_index = ses0 - dm0->sessions; - } - - pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP; - - b1 = vlib_get_buffer (vm, bi1); - - ip1 = vlib_buffer_get_current (b1); - udp1 = ip4_next_header (ip1); - tcp1 = (tcp_header_t *) udp1; - - sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX]; - - 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_snat_proto (ip1->protocol); - - if (PREDICT_FALSE(proto1 == SNAT_PROTOCOL_ICMP)) - { - rx_fib_index1 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index1); - icmp1 = (icmp46_header_t *) udp1; - - next1 = icmp_out2in(sm, b1, ip1, icmp1, sw_if_index1, - rx_fib_index1, node, next1, thread_index, - &ses1, &dm1); - goto trace1; - } - - key1.ext_host_addr = ip1->src_address; - key1.ext_host_port = tcp1->src; - key1.out_port = tcp1->dst; - - dm1 = snat_det_map_by_out(sm, &ip1->dst_address); - if (PREDICT_FALSE(!dm1)) - { - clib_warning("unknown dst address: %U", - format_ip4_address, &ip1->dst_address); - next1 = SNAT_OUT2IN_NEXT_DROP; - b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - goto trace1; - } - - snat_det_reverse(dm1, &ip1->dst_address, - clib_net_to_host_u16(tcp1->dst), &new_addr1); - - ses1 = snat_det_get_ses_by_out (dm1, &new_addr1, key1.as_u64); - if (PREDICT_FALSE(!ses1)) - { - clib_warning("no match src %U:%d dst %U:%d for user %U", - format_ip4_address, &ip1->src_address, - clib_net_to_host_u16 (tcp1->src), - format_ip4_address, &ip1->dst_address, - clib_net_to_host_u16 (tcp1->dst), - format_ip4_address, &new_addr1); - next1 = SNAT_OUT2IN_NEXT_DROP; - b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - goto trace1; - } - new_port1 = ses1->in_port; - - old_addr1 = ip1->dst_address; - ip1->dst_address = new_addr1; - vnet_buffer(b1)->sw_if_index[VLIB_TX] = sm->inside_fib_index; - - sum1 = ip1->checksum; - sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, - ip4_header_t, - dst_address /* changed member */); - ip1->checksum = ip_csum_fold (sum1); - - if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP)) - { - if (tcp1->flags & TCP_FLAG_FIN && ses1->state == SNAT_SESSION_TCP_ESTABLISHED) - ses1->state = SNAT_SESSION_TCP_CLOSE_WAIT; - else if (tcp1->flags & TCP_FLAG_ACK && ses1->state == SNAT_SESSION_TCP_LAST_ACK) - snat_det_ses_close(dm1, ses1); - - old_port1 = tcp1->dst; - tcp1->dst = new_port1; - - sum1 = tcp1->checksum; - sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, - 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->dst_port; - udp1->dst_port = new_port1; - udp1->checksum = 0; - } - - 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 (ses1) - t->session_index = ses1 - dm1->sessions; - } - - pkts_processed += next1 != SNAT_OUT2IN_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 = SNAT_OUT2IN_NEXT_LOOKUP; - u32 sw_if_index0; - ip4_header_t * ip0; - ip_csum_t sum0; - ip4_address_t new_addr0, old_addr0; - u16 new_port0, old_port0; - udp_header_t * udp0; - tcp_header_t * tcp0; - u32 proto0; - snat_det_out_key_t key0; - snat_det_map_t * dm0; - snat_det_session_t * ses0 = 0; - u32 rx_fib_index0; - icmp46_header_t * icmp0; - - /* 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); - - ip0 = vlib_buffer_get_current (b0); - udp0 = ip4_next_header (ip0); - tcp0 = (tcp_header_t *) udp0; - - sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; - - 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_snat_proto (ip0->protocol); - - if (PREDICT_FALSE(proto0 == SNAT_PROTOCOL_ICMP)) - { - rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0); - icmp0 = (icmp46_header_t *) udp0; - - next0 = icmp_out2in(sm, b0, ip0, icmp0, sw_if_index0, - rx_fib_index0, node, next0, thread_index, - &ses0, &dm0); - goto trace00; - } - - key0.ext_host_addr = ip0->src_address; - key0.ext_host_port = tcp0->src; - key0.out_port = tcp0->dst; - - dm0 = snat_det_map_by_out(sm, &ip0->dst_address); - if (PREDICT_FALSE(!dm0)) - { - clib_warning("unknown dst address: %U", - format_ip4_address, &ip0->dst_address); - next0 = SNAT_OUT2IN_NEXT_DROP; - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - goto trace00; - } - - snat_det_reverse(dm0, &ip0->dst_address, - clib_net_to_host_u16(tcp0->dst), &new_addr0); - - ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64); - if (PREDICT_FALSE(!ses0)) - { - clib_warning("no match src %U:%d dst %U:%d for user %U", - format_ip4_address, &ip0->src_address, - clib_net_to_host_u16 (tcp0->src), - format_ip4_address, &ip0->dst_address, - clib_net_to_host_u16 (tcp0->dst), - format_ip4_address, &new_addr0); - next0 = SNAT_OUT2IN_NEXT_DROP; - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - goto trace00; - } - new_port0 = ses0->in_port; - - old_addr0 = ip0->dst_address; - ip0->dst_address = new_addr0; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, - ip4_header_t, - dst_address /* changed member */); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) - { - if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED) - ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT; - else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_LAST_ACK) - snat_det_ses_close(dm0, ses0); - - old_port0 = tcp0->dst; - tcp0->dst = new_port0; - - sum0 = tcp0->checksum; - sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, - 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->dst_port; - udp0->dst_port = new_port0; - udp0->checksum = 0; - } - - 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 (ses0) - t->session_index = ses0 - dm0->sessions; - } - - pkts_processed += next0 != SNAT_OUT2IN_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, snat_det_out2in_node.index, - SNAT_OUT2IN_ERROR_OUT2IN_PACKETS, - pkts_processed); - return frame->n_vectors; -} - -VLIB_REGISTER_NODE (snat_det_out2in_node) = { - .function = snat_det_out2in_node_fn, - .name = "snat-det-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", - }, -}; -VLIB_NODE_FUNCTION_MULTIARCH (snat_det_out2in_node, snat_det_out2in_node_fn); - -/** - * Get address and port values to be used for packet SNAT translation - * and create session if needed - * - * @param[in,out] sm SNAT main - * @param[in,out] node SNAT node runtime - * @param[in] thread_index thread index - * @param[in,out] b0 buffer containing packet to be translated - * @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_det(snat_main_t *sm, vlib_node_runtime_t *node, - u32 thread_index, vlib_buffer_t *b0, u8 *p_proto, - snat_session_key_t *p_value, - u8 *p_dont_translate, void *d, void *e) -{ - ip4_header_t *ip0; - icmp46_header_t *icmp0; - u32 sw_if_index0; - u8 protocol; - snat_det_out_key_t key0; - u8 dont_translate = 0; - u32 next0 = ~0; - icmp_echo_header_t *echo0, *inner_echo0 = 0; - ip4_header_t *inner_ip0; - void *l4_header = 0; - icmp46_header_t *inner_icmp0; - snat_det_map_t * dm0 = 0; - ip4_address_t new_addr0 = {{0}}; - snat_det_session_t * ses0 = 0; - ip4_address_t out_addr; - - ip0 = vlib_buffer_get_current (b0); - icmp0 = (icmp46_header_t *) ip4_next_header (ip0); - echo0 = (icmp_echo_header_t *)(icmp0+1); - sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; - - if (!icmp_is_error_message (icmp0)) - { - protocol = SNAT_PROTOCOL_ICMP; - key0.ext_host_addr = ip0->src_address; - key0.ext_host_port = 0; - key0.out_port = echo0->identifier; - out_addr = ip0->dst_address; - } - else - { - inner_ip0 = (ip4_header_t *)(echo0+1); - l4_header = ip4_next_header (inner_ip0); - protocol = ip_proto_to_snat_proto (inner_ip0->protocol); - key0.ext_host_addr = inner_ip0->dst_address; - out_addr = inner_ip0->src_address; - switch (protocol) - { - case SNAT_PROTOCOL_ICMP: - inner_icmp0 = (icmp46_header_t*)l4_header; - inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1); - key0.ext_host_port = 0; - key0.out_port = inner_echo0->identifier; - break; - case SNAT_PROTOCOL_UDP: - case SNAT_PROTOCOL_TCP: - key0.ext_host_port = ((tcp_udp_header_t*)l4_header)->dst_port; - key0.out_port = ((tcp_udp_header_t*)l4_header)->src_port; - break; - default: - b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - } - - dm0 = snat_det_map_by_out(sm, &out_addr); - if (PREDICT_FALSE(!dm0)) - { - /* 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; - } - clib_warning("unknown dst address: %U", - format_ip4_address, &ip0->dst_address); - goto out; - } - - snat_det_reverse(dm0, &ip0->dst_address, - clib_net_to_host_u16(key0.out_port), &new_addr0); - - ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64); - if (PREDICT_FALSE(!ses0)) - { - /* 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; - } - clib_warning("no match src %U:%d dst %U:%d for user %U", - format_ip4_address, &key0.ext_host_addr, - clib_net_to_host_u16 (key0.ext_host_port), - format_ip4_address, &out_addr, - clib_net_to_host_u16 (key0.out_port), - format_ip4_address, &new_addr0); - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - - if (PREDICT_FALSE(icmp0->type != ICMP4_echo_reply && - !icmp_is_error_message (icmp0))) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; - next0 = SNAT_OUT2IN_NEXT_DROP; - goto out; - } - - goto out; - -out: - *p_proto = protocol; - if (ses0) - { - p_value->addr = new_addr0; - p_value->fib_index = sm->inside_fib_index; - p_value->port = ses0->in_port; - } - *p_dont_translate = dont_translate; - if (d) - *(snat_det_session_t**)d = ses0; - if (e) - *(snat_det_map_t**)e = dm0; - return next0; -} - -/**********************/ -/*** worker handoff ***/ -/**********************/ -static uword -snat_out2in_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 thread_index = vlib_get_thread_index (); - - 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; - 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); - - next_worker_index = sm->worker_out2in_cb(ip0, rx_fib_index0); - - if (PREDICT_FALSE (next_worker_index != thread_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_out2in_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, sm->out2in_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_out2in_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, sm->out2in_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_out2in_worker_handoff_node) = { - .function = snat_out2in_worker_handoff_fn, - .name = "snat-out2in-worker-handoff", - .vector_size = sizeof (u32), - .format_trace = format_snat_out2in_worker_handoff_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - - .n_next_nodes = 1, - - .next_nodes = { - [0] = "error-drop", - }, -}; - -VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_worker_handoff_node, snat_out2in_worker_handoff_fn); - -static uword -snat_out2in_fast_node_fn (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 n_left_from, * from, * to_next; - snat_out2in_next_t next_index; - u32 pkts_processed = 0; - snat_main_t * sm = &snat_main; - - 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 = 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; - 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); - - 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 (sw_if_index0, &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_snat_proto (ip0->protocol); - - if (PREDICT_FALSE (proto0 == ~0)) - goto trace00; - - if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) - { - next0 = icmp_out2in(sm, b0, ip0, icmp0, sw_if_index0, - rx_fib_index0, node, next0, ~0, 0, 0); - goto trace00; - } - - key0.addr = ip0->dst_address; - key0.port = udp0->dst_port; - key0.fib_index = rx_fib_index0; - - if (snat_static_mapping_match(sm, key0, &sm0, 1, 0)) - { - b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; - goto trace00; - } - - new_addr0 = sm0.addr.as_u32; - new_port0 = sm0.port; - vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; - 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)) - { - if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) - { - old_port0 = tcp0->dst_port; - tcp0->dst_port = 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->dst_port; - udp0->dst_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); - } - } - - 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; - } - - pkts_processed += next0 != SNAT_OUT2IN_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, snat_out2in_fast_node.index, - SNAT_OUT2IN_ERROR_OUT2IN_PACKETS, - pkts_processed); - return frame->n_vectors; -} - -VLIB_REGISTER_NODE (snat_out2in_fast_node) = { - .function = snat_out2in_fast_node_fn, - .name = "snat-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", - }, -}; -VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_fast_node, snat_out2in_fast_node_fn); |