From 603e75465899385a95350f3c96499050f7f960a5 Mon Sep 17 00:00:00 2001 From: Filip Varga Date: Tue, 21 Jul 2020 10:27:39 +0200 Subject: nat: move deterministic nat to det44 sub feature Type: refactor Change-Id: I0bb203102a0e13dd7448e2125925ab356bbd7937 Signed-off-by: Filip Varga --- src/plugins/nat/nat_det_in2out.c | 916 --------------------------------------- 1 file changed, 916 deletions(-) delete mode 100644 src/plugins/nat/nat_det_in2out.c (limited to 'src/plugins/nat/nat_det_in2out.c') diff --git a/src/plugins/nat/nat_det_in2out.c b/src/plugins/nat/nat_det_in2out.c deleted file mode 100644 index 74b4149ba8f..00000000000 --- a/src/plugins/nat/nat_det_in2out.c +++ /dev/null @@ -1,916 +0,0 @@ -/* - * Copyright (c) 2018 Cisco and/or its affiliates. - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at: - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ -/** - * @file - * @brief Deterministic/CGN NAT44 inside to outside network translation - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -typedef struct -{ - u32 sw_if_index; - u32 next_index; - u32 session_index; -} nat_det_in2out_trace_t; - -typedef enum -{ - NAT_DET_IN2OUT_NEXT_LOOKUP, - NAT_DET_IN2OUT_NEXT_DROP, - NAT_DET_IN2OUT_NEXT_ICMP_ERROR, - NAT_DET_IN2OUT_N_NEXT, -} nat_det_in2out_next_t; - -#define foreach_nat_det_in2out_error \ -_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ -_(NO_TRANSLATION, "No translation") \ -_(BAD_ICMP_TYPE, "unsupported ICMP type") \ -_(OUT_OF_PORTS, "Out of ports") \ -_(IN2OUT_PACKETS, "Good in2out packets processed") - -typedef enum -{ -#define _(sym,str) NAT_DET_IN2OUT_ERROR_##sym, - foreach_nat_det_in2out_error -#undef _ - NAT_DET_IN2OUT_N_ERROR, -} nat_det_in2out_error_t; - -static char *nat_det_in2out_error_strings[] = { -#define _(sym,string) string, - foreach_nat_det_in2out_error -#undef _ -}; - -static u8 * -format_nat_det_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 *); - nat_det_in2out_trace_t *t = va_arg (*args, nat_det_in2out_trace_t *); - - s = format (s, "NAT_DET_IN2OUT: sw_if_index %d, next index %d, session %d", - t->sw_if_index, t->next_index, t->session_index); - - return s; -} - -#ifndef CLIB_MARCH_VARIANT -/** - * Get address and port values to be used for ICMP packet translation - * and create session if needed - * - * @param[in,out] sm NAT main - * @param[in,out] node NAT node runtime - * @param[in] thread_index thread index - * @param[in,out] b0 buffer containing packet to be translated - * @param[in,out] ip0 ip header - * @param[out] p_proto protocol used for matching - * @param[out] p_value address and port after NAT translation - * @param[out] p_dont_translate if packet should not be translated - * @param d optional parameter - * @param e optional parameter - */ -u32 -icmp_match_in2out_det (snat_main_t * sm, vlib_node_runtime_t * node, - u32 thread_index, vlib_buffer_t * b0, - ip4_header_t * ip0, ip4_address_t * addr, - u16 * port, u32 * fib_index, - nat_protocol_t * proto, void *d, void *e, - u8 * dont_translate) -{ - vlib_main_t *vm = vlib_get_main (); - icmp46_header_t *icmp0; - u32 sw_if_index0; - u32 rx_fib_index0; - nat_protocol_t protocol; - snat_det_out_key_t key0; - 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; - u16 lo_port0, i0; - snat_det_session_t *ses0 = 0; - ip4_address_t in_addr; - u16 in_port; - *dont_translate = 0; - - 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]; - rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); - - if (!icmp_type_is_error_message - (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)) - { - protocol = NAT_PROTOCOL_ICMP; - in_addr = ip0->src_address; - in_port = vnet_buffer (b0)->ip.reass.l4_src_port; - } - else - { - /* if error message, then it's not fragmented and we can access it */ - inner_ip0 = (ip4_header_t *) (echo0 + 1); - l4_header = ip4_next_header (inner_ip0); - protocol = ip_proto_to_nat_proto (inner_ip0->protocol); - in_addr = inner_ip0->dst_address; - switch (protocol) - { - case NAT_PROTOCOL_ICMP: - inner_icmp0 = (icmp46_header_t *) l4_header; - inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); - in_port = inner_echo0->identifier; - break; - case NAT_PROTOCOL_UDP: - case NAT_PROTOCOL_TCP: - in_port = ((tcp_udp_header_t *) l4_header)->dst_port; - break; - default: - b0->error = node->errors[NAT_DET_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; - next0 = NAT_DET_IN2OUT_NEXT_DROP; - goto out; - } - } - - dm0 = snat_det_map_by_user (sm, &in_addr); - if (PREDICT_FALSE (!dm0)) - { - nat_log_info ("no match for internal host %U", - format_ip4_address, &in_addr); - if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0, - IP_PROTOCOL_ICMP, - rx_fib_index0))) - { - *dont_translate = 1; - goto out; - } - next0 = NAT_DET_IN2OUT_NEXT_DROP; - b0->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION]; - goto out; - } - - snat_det_forward (dm0, &in_addr, &new_addr0, &lo_port0); - - key0.ext_host_addr = ip0->dst_address; - key0.ext_host_port = 0; - - ses0 = snat_det_find_ses_by_in (dm0, &in_addr, in_port, key0); - if (PREDICT_FALSE (!ses0)) - { - if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0, - IP_PROTOCOL_ICMP, - rx_fib_index0))) - { - *dont_translate = 1; - goto out; - } - if (icmp0->type != ICMP4_echo_request) - { - b0->error = node->errors[NAT_DET_IN2OUT_ERROR_BAD_ICMP_TYPE]; - next0 = NAT_DET_IN2OUT_NEXT_DROP; - goto out; - } - for (i0 = 0; i0 < dm0->ports_per_host; i0++) - { - key0.out_port = clib_host_to_net_u16 (lo_port0 + - ((i0 + - clib_net_to_host_u16 - (echo0->identifier)) % - dm0->ports_per_host)); - - if (snat_det_get_ses_by_out (dm0, &in_addr, key0.as_u64)) - continue; - - ses0 = - snat_det_ses_create (thread_index, dm0, - &in_addr, echo0->identifier, &key0); - break; - } - if (PREDICT_FALSE (!ses0)) - { - next0 = NAT_DET_IN2OUT_NEXT_DROP; - b0->error = node->errors[NAT_DET_IN2OUT_ERROR_OUT_OF_PORTS]; - goto out; - } - } - - if (PREDICT_FALSE - (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request - && !icmp_type_is_error_message (vnet_buffer (b0)->ip. - reass.icmp_type_or_tcp_flags))) - { - b0->error = node->errors[NAT_DET_IN2OUT_ERROR_BAD_ICMP_TYPE]; - next0 = NAT_DET_IN2OUT_NEXT_DROP; - goto out; - } - - u32 now = (u32) vlib_time_now (vm); - - ses0->state = SNAT_SESSION_ICMP_ACTIVE; - ses0->expire = now + sm->icmp_timeout; - -out: - *proto = protocol; - if (ses0) - { - *addr = new_addr0; - *fib_index = sm->outside_fib_index; - *port = ses0->out.out_port; - } - if (d) - *(snat_det_session_t **) d = ses0; - if (e) - *(snat_det_map_t **) e = dm0; - return next0; -} -#endif - -VLIB_NODE_FN (snat_det_in2out_node) (vlib_main_t * vm, - vlib_node_runtime_t * node, - vlib_frame_t * frame) -{ - u32 n_left_from, *from, *to_next; - nat_det_in2out_next_t next_index; - u32 pkts_processed = 0; - snat_main_t *sm = &snat_main; - u32 now = (u32) vlib_time_now (vm); - u32 thread_index = vm->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, next1; - 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 old_port0, new_port0, lo_port0, i0; - u16 old_port1, new_port1, lo_port1, i1; - 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, LOAD); - CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD); - } - - /* 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); - - next0 = NAT_DET_IN2OUT_NEXT_LOOKUP; - next1 = NAT_DET_IN2OUT_NEXT_LOOKUP; - - 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 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR; - goto trace0; - } - - proto0 = ip_proto_to_nat_proto (ip0->protocol); - - if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) - { - rx_fib_index0 = - ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); - icmp0 = (icmp46_header_t *) udp0; - - next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, - rx_fib_index0, node, next0, thread_index, - &ses0, &dm0); - goto trace0; - } - - dm0 = snat_det_map_by_user (sm, &ip0->src_address); - if (PREDICT_FALSE (!dm0)) - { - nat_log_info ("no match for internal host %U", - format_ip4_address, &ip0->src_address); - next0 = NAT_DET_IN2OUT_NEXT_DROP; - b0->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION]; - goto trace0; - } - - snat_det_forward (dm0, &ip0->src_address, &new_addr0, &lo_port0); - - key0.ext_host_addr = ip0->dst_address; - key0.ext_host_port = tcp0->dst; - - ses0 = - snat_det_find_ses_by_in (dm0, &ip0->src_address, tcp0->src, key0); - if (PREDICT_FALSE (!ses0)) - { - for (i0 = 0; i0 < dm0->ports_per_host; i0++) - { - key0.out_port = clib_host_to_net_u16 (lo_port0 + - ((i0 + - clib_net_to_host_u16 - (tcp0->src)) % - dm0-> - ports_per_host)); - - if (snat_det_get_ses_by_out - (dm0, &ip0->src_address, key0.as_u64)) - continue; - - ses0 = - snat_det_ses_create (thread_index, dm0, &ip0->src_address, - tcp0->src, &key0); - break; - } - if (PREDICT_FALSE (!ses0)) - { - /* too many sessions for user, send ICMP error packet */ - vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; - icmp4_error_set_vnet_buffer (b0, - ICMP4_destination_unreachable, - ICMP4_destination_unreachable_destination_unreachable_host, - 0); - next0 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR; - goto trace0; - } - } - - old_port0 = udp0->src_port; - udp0->src_port = new_port0 = ses0->out.out_port; - - old_addr0.as_u32 = ip0->src_address.as_u32; - ip0->src_address.as_u32 = new_addr0.as_u32; - vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, - ip4_header_t, - src_address /* changed member */ ); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) - { - if (tcp0->flags & TCP_FLAG_SYN) - ses0->state = SNAT_SESSION_TCP_SYN_SENT; - else if (tcp0->flags & TCP_FLAG_ACK - && ses0->state == SNAT_SESSION_TCP_SYN_SENT) - ses0->state = SNAT_SESSION_TCP_ESTABLISHED; - else if (tcp0->flags & TCP_FLAG_FIN - && ses0->state == SNAT_SESSION_TCP_ESTABLISHED) - ses0->state = SNAT_SESSION_TCP_FIN_WAIT; - else if (tcp0->flags & TCP_FLAG_ACK - && ses0->state == SNAT_SESSION_TCP_FIN_WAIT) - snat_det_ses_close (dm0, ses0); - else if (tcp0->flags & TCP_FLAG_FIN - && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT) - ses0->state = SNAT_SESSION_TCP_LAST_ACK; - else if (tcp0->flags == 0 - && ses0->state == SNAT_SESSION_UNKNOWN) - ses0->state = SNAT_SESSION_TCP_ESTABLISHED; - - 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 */ ); - mss_clamping (sm->mss_clamping, tcp0, &sum0); - tcp0->checksum = ip_csum_fold (sum0); - } - else - { - ses0->state = SNAT_SESSION_UDP_ACTIVE; - - if (PREDICT_FALSE (udp0->checksum)) - { - sum0 = udp0->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 */ ); - udp0->checksum = ip_csum_fold (sum0); - } - } - - switch (ses0->state) - { - case SNAT_SESSION_UDP_ACTIVE: - ses0->expire = now + sm->udp_timeout; - break; - case SNAT_SESSION_TCP_SYN_SENT: - case SNAT_SESSION_TCP_FIN_WAIT: - case SNAT_SESSION_TCP_CLOSE_WAIT: - case SNAT_SESSION_TCP_LAST_ACK: - ses0->expire = now + sm->tcp_transitory_timeout; - break; - case SNAT_SESSION_TCP_ESTABLISHED: - ses0->expire = now + sm->tcp_established_timeout; - break; - } - - trace0: - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - nat_det_in2out_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 != NAT_DET_IN2OUT_NEXT_DROP; - - 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 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR; - goto trace1; - } - - proto1 = ip_proto_to_nat_proto (ip1->protocol); - - if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) - { - rx_fib_index1 = - ip4_fib_table_get_index_for_sw_if_index (sw_if_index1); - icmp1 = (icmp46_header_t *) udp1; - - next1 = icmp_in2out (sm, b1, ip1, icmp1, sw_if_index1, - rx_fib_index1, node, next1, thread_index, - &ses1, &dm1); - goto trace1; - } - - dm1 = snat_det_map_by_user (sm, &ip1->src_address); - if (PREDICT_FALSE (!dm1)) - { - nat_log_info ("no match for internal host %U", - format_ip4_address, &ip0->src_address); - next1 = NAT_DET_IN2OUT_NEXT_DROP; - b1->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION]; - goto trace1; - } - - snat_det_forward (dm1, &ip1->src_address, &new_addr1, &lo_port1); - - key1.ext_host_addr = ip1->dst_address; - key1.ext_host_port = tcp1->dst; - - ses1 = - snat_det_find_ses_by_in (dm1, &ip1->src_address, tcp1->src, key1); - if (PREDICT_FALSE (!ses1)) - { - for (i1 = 0; i1 < dm1->ports_per_host; i1++) - { - key1.out_port = clib_host_to_net_u16 (lo_port1 + - ((i1 + - clib_net_to_host_u16 - (tcp1->src)) % - dm1-> - ports_per_host)); - - if (snat_det_get_ses_by_out - (dm1, &ip1->src_address, key1.as_u64)) - continue; - - ses1 = - snat_det_ses_create (thread_index, dm1, &ip1->src_address, - tcp1->src, &key1); - break; - } - if (PREDICT_FALSE (!ses1)) - { - /* too many sessions for user, send ICMP error packet */ - vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; - icmp4_error_set_vnet_buffer (b1, - ICMP4_destination_unreachable, - ICMP4_destination_unreachable_destination_unreachable_host, - 0); - next1 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR; - goto trace1; - } - } - - old_port1 = udp1->src_port; - udp1->src_port = new_port1 = ses1->out.out_port; - - old_addr1.as_u32 = ip1->src_address.as_u32; - ip1->src_address.as_u32 = new_addr1.as_u32; - vnet_buffer (b1)->sw_if_index[VLIB_TX] = sm->outside_fib_index; - - sum1 = ip1->checksum; - sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, - ip4_header_t, - src_address /* changed member */ ); - ip1->checksum = ip_csum_fold (sum1); - - if (PREDICT_TRUE (proto1 == NAT_PROTOCOL_TCP)) - { - if (tcp1->flags & TCP_FLAG_SYN) - ses1->state = SNAT_SESSION_TCP_SYN_SENT; - else if (tcp1->flags & TCP_FLAG_ACK - && ses1->state == SNAT_SESSION_TCP_SYN_SENT) - ses1->state = SNAT_SESSION_TCP_ESTABLISHED; - else if (tcp1->flags & TCP_FLAG_FIN - && ses1->state == SNAT_SESSION_TCP_ESTABLISHED) - ses1->state = SNAT_SESSION_TCP_FIN_WAIT; - else if (tcp1->flags & TCP_FLAG_ACK - && ses1->state == SNAT_SESSION_TCP_FIN_WAIT) - snat_det_ses_close (dm1, ses1); - else if (tcp1->flags & TCP_FLAG_FIN - && ses1->state == SNAT_SESSION_TCP_CLOSE_WAIT) - ses1->state = SNAT_SESSION_TCP_LAST_ACK; - else if (tcp1->flags == 0 - && ses1->state == SNAT_SESSION_UNKNOWN) - ses1->state = SNAT_SESSION_TCP_ESTABLISHED; - - 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 */ ); - mss_clamping (sm->mss_clamping, tcp1, &sum1); - tcp1->checksum = ip_csum_fold (sum1); - } - else - { - ses1->state = SNAT_SESSION_UDP_ACTIVE; - - if (PREDICT_FALSE (udp1->checksum)) - { - sum1 = udp1->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 */ ); - udp1->checksum = ip_csum_fold (sum1); - } - } - - switch (ses1->state) - { - case SNAT_SESSION_UDP_ACTIVE: - ses1->expire = now + sm->udp_timeout; - break; - case SNAT_SESSION_TCP_SYN_SENT: - case SNAT_SESSION_TCP_FIN_WAIT: - case SNAT_SESSION_TCP_CLOSE_WAIT: - case SNAT_SESSION_TCP_LAST_ACK: - ses1->expire = now + sm->tcp_transitory_timeout; - break; - case SNAT_SESSION_TCP_ESTABLISHED: - ses1->expire = now + sm->tcp_established_timeout; - break; - } - - trace1: - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b1->flags & VLIB_BUFFER_IS_TRACED))) - { - nat_det_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 (ses1) - t->session_index = ses1 - dm1->sessions; - } - - pkts_processed += next1 != NAT_DET_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; - ip4_address_t new_addr0, old_addr0; - u16 old_port0, new_port0, lo_port0, i0; - 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); - next0 = NAT_DET_IN2OUT_NEXT_LOOKUP; - - 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 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR; - goto trace00; - } - - proto0 = ip_proto_to_nat_proto (ip0->protocol); - - if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) - { - rx_fib_index0 = - ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); - icmp0 = (icmp46_header_t *) udp0; - - next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, - rx_fib_index0, node, next0, thread_index, - &ses0, &dm0); - goto trace00; - } - - dm0 = snat_det_map_by_user (sm, &ip0->src_address); - if (PREDICT_FALSE (!dm0)) - { - nat_log_info ("no match for internal host %U", - format_ip4_address, &ip0->src_address); - next0 = NAT_DET_IN2OUT_NEXT_DROP; - b0->error = node->errors[NAT_DET_IN2OUT_ERROR_NO_TRANSLATION]; - goto trace00; - } - - snat_det_forward (dm0, &ip0->src_address, &new_addr0, &lo_port0); - - key0.ext_host_addr = ip0->dst_address; - key0.ext_host_port = tcp0->dst; - - ses0 = - snat_det_find_ses_by_in (dm0, &ip0->src_address, tcp0->src, key0); - if (PREDICT_FALSE (!ses0)) - { - for (i0 = 0; i0 < dm0->ports_per_host; i0++) - { - key0.out_port = clib_host_to_net_u16 (lo_port0 + - ((i0 + - clib_net_to_host_u16 - (tcp0->src)) % - dm0-> - ports_per_host)); - - if (snat_det_get_ses_by_out - (dm0, &ip0->src_address, key0.as_u64)) - continue; - - ses0 = - snat_det_ses_create (thread_index, dm0, &ip0->src_address, - tcp0->src, &key0); - break; - } - if (PREDICT_FALSE (!ses0)) - { - /* too many sessions for user, send ICMP error packet */ - vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; - icmp4_error_set_vnet_buffer (b0, - ICMP4_destination_unreachable, - ICMP4_destination_unreachable_destination_unreachable_host, - 0); - next0 = NAT_DET_IN2OUT_NEXT_ICMP_ERROR; - goto trace00; - } - } - - old_port0 = udp0->src_port; - udp0->src_port = new_port0 = ses0->out.out_port; - - old_addr0.as_u32 = ip0->src_address.as_u32; - ip0->src_address.as_u32 = new_addr0.as_u32; - vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index; - - sum0 = ip0->checksum; - sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, - ip4_header_t, - src_address /* changed member */ ); - ip0->checksum = ip_csum_fold (sum0); - - if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) - { - if (tcp0->flags & TCP_FLAG_SYN) - ses0->state = SNAT_SESSION_TCP_SYN_SENT; - else if (tcp0->flags & TCP_FLAG_ACK - && ses0->state == SNAT_SESSION_TCP_SYN_SENT) - ses0->state = SNAT_SESSION_TCP_ESTABLISHED; - else if (tcp0->flags & TCP_FLAG_FIN - && ses0->state == SNAT_SESSION_TCP_ESTABLISHED) - ses0->state = SNAT_SESSION_TCP_FIN_WAIT; - else if (tcp0->flags & TCP_FLAG_ACK - && ses0->state == SNAT_SESSION_TCP_FIN_WAIT) - snat_det_ses_close (dm0, ses0); - else if (tcp0->flags & TCP_FLAG_FIN - && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT) - ses0->state = SNAT_SESSION_TCP_LAST_ACK; - else if (tcp0->flags == 0 - && ses0->state == SNAT_SESSION_UNKNOWN) - ses0->state = SNAT_SESSION_TCP_ESTABLISHED; - - 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 */ ); - mss_clamping (sm->mss_clamping, tcp0, &sum0); - tcp0->checksum = ip_csum_fold (sum0); - } - else - { - ses0->state = SNAT_SESSION_UDP_ACTIVE; - - if (PREDICT_FALSE (udp0->checksum)) - { - sum0 = udp0->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 */ ); - udp0->checksum = ip_csum_fold (sum0); - } - } - - switch (ses0->state) - { - case SNAT_SESSION_UDP_ACTIVE: - ses0->expire = now + sm->udp_timeout; - break; - case SNAT_SESSION_TCP_SYN_SENT: - case SNAT_SESSION_TCP_FIN_WAIT: - case SNAT_SESSION_TCP_CLOSE_WAIT: - case SNAT_SESSION_TCP_LAST_ACK: - ses0->expire = now + sm->tcp_transitory_timeout; - break; - case SNAT_SESSION_TCP_ESTABLISHED: - ses0->expire = now + sm->tcp_established_timeout; - break; - } - - trace00: - if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) - && (b0->flags & VLIB_BUFFER_IS_TRACED))) - { - nat_det_in2out_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 != NAT_DET_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, sm->det_in2out_node_index, - NAT_DET_IN2OUT_ERROR_IN2OUT_PACKETS, - pkts_processed); - return frame->n_vectors; -} - -/* *INDENT-OFF* */ -VLIB_REGISTER_NODE (snat_det_in2out_node) = { - .name = "nat44-det-in2out", - .vector_size = sizeof (u32), - .format_trace = format_nat_det_in2out_trace, - .type = VLIB_NODE_TYPE_INTERNAL, - .n_errors = ARRAY_LEN(nat_det_in2out_error_strings), - .error_strings = nat_det_in2out_error_strings, - .n_next_nodes = NAT_DET_IN2OUT_N_NEXT, - /* edit / add dispositions here */ - .next_nodes = { - [NAT_DET_IN2OUT_NEXT_DROP] = "error-drop", - [NAT_DET_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", - [NAT_DET_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", - }, -}; -/* *INDENT-ON* */ - -/* - * fd.io coding-style-patch-verification: ON - * - * Local Variables: - * eval: (c-set-style "gnu") - * End: - */ -- cgit 1.2.3-korg