diff options
Diffstat (limited to 'src/plugins/nat/det44/det44_out2in.c')
| -rw-r--r-- | src/plugins/nat/det44/det44_out2in.c | 866 |
1 files changed, 866 insertions, 0 deletions
diff --git a/src/plugins/nat/det44/det44_out2in.c b/src/plugins/nat/det44/det44_out2in.c new file mode 100644 index 00000000000..5ee28777b84 --- /dev/null +++ b/src/plugins/nat/det44/det44_out2in.c @@ -0,0 +1,866 @@ +/* + * Copyright (c) 2020 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 NAT (CGN) outside to inside translation + */ + +#include <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/ip/ip.h> +#include <vnet/fib/ip4_fib.h> +#include <vppinfra/error.h> +#include <vppinfra/elog.h> + +#include <nat/det44/det44.h> +#include <nat/det44/det44_inlines.h> + +#include <nat/lib/lib.h> +#include <nat/lib/inlines.h> +#include <nat/lib/nat_inlines.h> + +typedef enum +{ + DET44_OUT2IN_NEXT_DROP, + DET44_OUT2IN_NEXT_LOOKUP, + DET44_OUT2IN_NEXT_ICMP_ERROR, + DET44_OUT2IN_N_NEXT, +} det44_out2in_next_t; + +typedef struct +{ + u32 sw_if_index; + u32 next_index; + u32 session_index; +} det44_out2in_trace_t; + +#define foreach_det44_out2in_error \ +_(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ +_(NO_TRANSLATION, "No translation") \ +_(BAD_ICMP_TYPE, "unsupported ICMP type") \ +_(OUT2IN_PACKETS, "Good out2in packets processed") + +typedef enum +{ +#define _(sym,str) DET44_OUT2IN_ERROR_##sym, + foreach_det44_out2in_error +#undef _ + DET44_OUT2IN_N_ERROR, +} det44_out2in_error_t; + +static char *det44_out2in_error_strings[] = { +#define _(sym,string) string, + foreach_det44_out2in_error +#undef _ +}; + +static u8 * +format_det44_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 *); + det44_out2in_trace_t *t = va_arg (*args, det44_out2in_trace_t *); + + s = + format (s, + "DET44_OUT2IN: sw_if_index %d, next index %d, session index %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] node NAT node runtime + * @param[in] thread_index thread index + * @param[in,out] b0 buffer containing packet to be translated + * @param[in,out] ip0 ip header + * @param[out] p_proto protocol used for matching + * @param[out] p_value address and port after NAT translation + * @param[out] p_dont_translate if packet should not be translated + * @param d optional parameter + * @param e optional parameter + */ +u32 +icmp_match_out2in_det (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) +{ + det44_main_t *dm = &det44_main; + icmp46_header_t *icmp0; + u32 sw_if_index0; + u8 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 *mp0 = 0; + ip4_address_t new_addr0 = { {0} }; + snat_det_session_t *ses0 = 0; + ip4_address_t out_addr; + *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]; + + if (!icmp_type_is_error_message + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)) + { + protocol = NAT_PROTOCOL_ICMP; + key0.ext_host_addr = ip0->src_address; + key0.ext_host_port = 0; + key0.out_port = vnet_buffer (b0)->ip.reass.l4_src_port; + out_addr = ip0->dst_address; + } + 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); + key0.ext_host_addr = inner_ip0->dst_address; + out_addr = inner_ip0->src_address; + switch (protocol) + { + case NAT_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 NAT_PROTOCOL_UDP: + case NAT_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[DET44_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + } + + mp0 = snat_det_map_by_out (&out_addr); + if (PREDICT_FALSE (!mp0)) + { + /* Don't NAT packet aimed at the intfc address */ + if (PREDICT_FALSE (!det44_is_interface_addr (node, sw_if_index0, + ip0->dst_address.as_u32))) + { + *dont_translate = 1; + goto out; + } + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip0->dst_address); + goto out; + } + + snat_det_reverse (mp0, &ip0->dst_address, + clib_net_to_host_u16 (key0.out_port), &new_addr0); + + ses0 = snat_det_get_ses_by_out (mp0, &new_addr0, key0.as_u64); + if (PREDICT_FALSE (!ses0)) + { + /* Don't NAT packet aimed at the intfc address */ + if (PREDICT_FALSE (!det44_is_interface_addr (node, sw_if_index0, + ip0->dst_address.as_u32))) + { + *dont_translate = 1; + goto out; + } + det44_log_info ("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[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + + if (PREDICT_FALSE + (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply + && !icmp_type_is_error_message (vnet_buffer (b0)->ip. + reass.icmp_type_or_tcp_flags))) + { + b0->error = node->errors[DET44_OUT2IN_ERROR_BAD_ICMP_TYPE]; + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + + goto out; + +out: + *proto = protocol; + if (ses0) + { + *addr = new_addr0; + *fib_index = dm->inside_fib_index; + *port = ses0->in_port; + } + if (d) + *(snat_det_session_t **) d = ses0; + if (e) + *(snat_det_map_t **) e = mp0; + return next0; +} +#endif + +#ifndef CLIB_MARCH_VARIANT +u32 +det44_icmp_out2in (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) +{ + vlib_main_t *vm = vlib_get_main (); + u32 new_addr0, old_addr0, next0_tmp, fib_index; + u16 old_id0, new_id0, port, checksum0; + icmp_echo_header_t *echo0, *inner_echo0; + icmp46_header_t *inner_icmp0; + ip4_header_t *inner_ip0; + ip4_address_t addr; + void *l4_header; + u8 dont_translate; + ip_csum_t sum0; + nat_protocol_t proto; + + echo0 = (icmp_echo_header_t *) (icmp0 + 1); + next0_tmp = icmp_match_out2in_det (node, thread_index, b0, ip0, + &addr, &port, &fib_index, &proto, + d, e, &dont_translate); + if (next0_tmp != ~0) + next0 = next0_tmp; + if (next0 == DET44_OUT2IN_NEXT_DROP || dont_translate) + goto out; + + if (PREDICT_TRUE (!ip4_is_fragment (ip0))) + { + sum0 = + ip_incremental_checksum_buffer (vm, b0, + (u8 *) icmp0 - + (u8 *) vlib_buffer_get_current (b0), + ntohs (ip0->length) - + ip4_header_bytes (ip0), 0); + checksum0 = ~ip_csum_fold (sum0); + if (checksum0 != 0 && checksum0 != 0xffff) + { + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + } + + old_addr0 = ip0->dst_address.as_u32; + new_addr0 = ip0->dst_address.as_u32 = addr.as_u32; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index; + + sum0 = ip0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + dst_address /* changed member */ ); + ip0->checksum = ip_csum_fold (sum0); + + + if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) + { + if (icmp0->checksum == 0) + icmp0->checksum = 0xffff; + + if (!icmp_type_is_error_message (icmp0->type)) + { + new_id0 = port; + if (PREDICT_FALSE (new_id0 != echo0->identifier)) + { + old_id0 = echo0->identifier; + new_id0 = port; + echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier /* changed member */ ); + icmp0->checksum = ip_csum_fold (sum0); + } + } + else + { + inner_ip0 = (ip4_header_t *) (echo0 + 1); + l4_header = ip4_next_header (inner_ip0); + + if (!ip4_header_checksum_is_valid (inner_ip0)) + { + next0 = DET44_OUT2IN_NEXT_DROP; + goto out; + } + + old_addr0 = inner_ip0->src_address.as_u32; + inner_ip0->src_address = addr; + new_addr0 = inner_ip0->src_address.as_u32; + + sum0 = icmp0->checksum; + sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, + src_address /* changed member */ ); + icmp0->checksum = ip_csum_fold (sum0); + + switch (proto) + { + case NAT_PROTOCOL_ICMP: + inner_icmp0 = (icmp46_header_t *) l4_header; + inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); + + old_id0 = inner_echo0->identifier; + new_id0 = port; + inner_echo0->identifier = new_id0; + + sum0 = icmp0->checksum; + sum0 = + ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, + identifier); + icmp0->checksum = ip_csum_fold (sum0); + break; + case NAT_PROTOCOL_UDP: + case NAT_PROTOCOL_TCP: + old_id0 = ((tcp_udp_header_t *) l4_header)->src_port; + new_id0 = port; + ((tcp_udp_header_t *) l4_header)->src_port = new_id0; + + sum0 = icmp0->checksum; + sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t, + src_port); + icmp0->checksum = ip_csum_fold (sum0); + break; + default: + ASSERT (0); + } + } + } + +out: + return next0; +} +#endif + +VLIB_NODE_FN (det44_out2in_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + det44_out2in_next_t next_index; + u32 pkts_processed = 0; + det44_main_t *dm = &det44_main; + 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 = DET44_OUT2IN_NEXT_LOOKUP; + u32 next1 = DET44_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 *mp0, *mp1; + 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); + + 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 = DET44_OUT2IN_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 = det44_icmp_out2in (b0, ip0, icmp0, sw_if_index0, + rx_fib_index0, node, next0, + thread_index, &ses0, &mp0); + goto trace0; + } + + key0.ext_host_addr = ip0->src_address; + key0.ext_host_port = tcp0->src; + key0.out_port = tcp0->dst; + + mp0 = snat_det_map_by_out (&ip0->dst_address); + if (PREDICT_FALSE (!mp0)) + { + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip0->dst_address); + next0 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace0; + } + + snat_det_reverse (mp0, &ip0->dst_address, + clib_net_to_host_u16 (tcp0->dst), &new_addr0); + + ses0 = snat_det_get_ses_by_out (mp0, &new_addr0, key0.as_u64); + if (PREDICT_FALSE (!ses0)) + { + det44_log_info ("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 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace0; + } + old_port0 = udp0->dst_port; + udp0->dst_port = new_port0 = ses0->in_port; + + old_addr0 = ip0->dst_address; + ip0->dst_address = new_addr0; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->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 == NAT_PROTOCOL_TCP)) + { + if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_ESTABLISHED) + ses0->state = DET44_SESSION_TCP_CLOSE_WAIT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_LAST_ACK) + snat_det_ses_close (mp0, ses0); + + 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 if (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); + } + + trace0: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_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 - mp0->sessions; + } + + pkts_processed += next0 != DET44_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 = DET44_OUT2IN_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 = det44_icmp_out2in (b1, ip1, icmp1, sw_if_index1, + rx_fib_index1, node, next1, + thread_index, &ses1, &mp1); + goto trace1; + } + + key1.ext_host_addr = ip1->src_address; + key1.ext_host_port = tcp1->src; + key1.out_port = tcp1->dst; + + mp1 = snat_det_map_by_out (&ip1->dst_address); + if (PREDICT_FALSE (!mp1)) + { + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip1->dst_address); + next1 = DET44_OUT2IN_NEXT_DROP; + b1->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace1; + } + + snat_det_reverse (mp1, &ip1->dst_address, + clib_net_to_host_u16 (tcp1->dst), &new_addr1); + + ses1 = snat_det_get_ses_by_out (mp1, &new_addr1, key1.as_u64); + if (PREDICT_FALSE (!ses1)) + { + det44_log_info ("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 = DET44_OUT2IN_NEXT_DROP; + b1->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace1; + } + old_port1 = udp1->dst_port; + udp1->dst_port = new_port1 = ses1->in_port; + + old_addr1 = ip1->dst_address; + ip1->dst_address = new_addr1; + vnet_buffer (b1)->sw_if_index[VLIB_TX] = dm->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 == NAT_PROTOCOL_TCP)) + { + if (tcp1->flags & TCP_FLAG_FIN + && ses1->state == DET44_SESSION_TCP_ESTABLISHED) + ses1->state = DET44_SESSION_TCP_CLOSE_WAIT; + else if (tcp1->flags & TCP_FLAG_ACK + && ses1->state == DET44_SESSION_TCP_LAST_ACK) + snat_det_ses_close (mp1, ses1); + + 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 if (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); + } + + trace1: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b1->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_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 - mp1->sessions; + } + + pkts_processed += next1 != DET44_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 = DET44_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 *mp0; + 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 = DET44_OUT2IN_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 = det44_icmp_out2in (b0, ip0, icmp0, sw_if_index0, + rx_fib_index0, node, next0, + thread_index, &ses0, &mp0); + goto trace00; + } + + key0.ext_host_addr = ip0->src_address; + key0.ext_host_port = tcp0->src; + key0.out_port = tcp0->dst; + + mp0 = snat_det_map_by_out (&ip0->dst_address); + if (PREDICT_FALSE (!mp0)) + { + det44_log_info ("unknown dst address: %U", + format_ip4_address, &ip0->dst_address); + next0 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace00; + } + + snat_det_reverse (mp0, &ip0->dst_address, + clib_net_to_host_u16 (tcp0->dst), &new_addr0); + + ses0 = snat_det_get_ses_by_out (mp0, &new_addr0, key0.as_u64); + if (PREDICT_FALSE (!ses0)) + { + det44_log_info ("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 = DET44_OUT2IN_NEXT_DROP; + b0->error = node->errors[DET44_OUT2IN_ERROR_NO_TRANSLATION]; + goto trace00; + } + old_port0 = udp0->dst_port; + udp0->dst_port = new_port0 = ses0->in_port; + + old_addr0 = ip0->dst_address; + ip0->dst_address = new_addr0; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = dm->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 == NAT_PROTOCOL_TCP)) + { + if (tcp0->flags & TCP_FLAG_FIN + && ses0->state == DET44_SESSION_TCP_ESTABLISHED) + ses0->state = DET44_SESSION_TCP_CLOSE_WAIT; + else if (tcp0->flags & TCP_FLAG_ACK + && ses0->state == DET44_SESSION_TCP_LAST_ACK) + snat_det_ses_close (mp0, ses0); + + 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 if (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); + } + + trace00: + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + det44_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 - mp0->sessions; + } + + pkts_processed += next0 != DET44_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, dm->out2in_node_index, + DET44_OUT2IN_ERROR_OUT2IN_PACKETS, + pkts_processed); + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (det44_out2in_node) = { + .name = "det44-out2in", + .vector_size = sizeof (u32), + .format_trace = format_det44_out2in_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + .n_errors = ARRAY_LEN(det44_out2in_error_strings), + .error_strings = det44_out2in_error_strings, + .runtime_data_bytes = sizeof (det44_runtime_t), + .n_next_nodes = DET44_OUT2IN_N_NEXT, + /* edit / add dispositions here */ + .next_nodes = { + [DET44_OUT2IN_NEXT_DROP] = "error-drop", + [DET44_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", + [DET44_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", + }, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |