diff options
Diffstat (limited to 'vnet/vnet/map/ip4_map_t.c')
| -rw-r--r-- | vnet/vnet/map/ip4_map_t.c | 1092 |
1 files changed, 1092 insertions, 0 deletions
diff --git a/vnet/vnet/map/ip4_map_t.c b/vnet/vnet/map/ip4_map_t.c new file mode 100644 index 00000000000..07f5b19c257 --- /dev/null +++ b/vnet/vnet/map/ip4_map_t.c @@ -0,0 +1,1092 @@ +/* + * Copyright (c) 2015 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 "map.h" + +#include "../ip/ip_frag.h" + +#define IP4_MAP_T_DUAL_LOOP 1 + +typedef enum { + IP4_MAPT_NEXT_MAPT_TCP_UDP, + IP4_MAPT_NEXT_MAPT_ICMP, + IP4_MAPT_NEXT_MAPT_FRAGMENTED, + IP4_MAPT_NEXT_DROP, + IP4_MAPT_N_NEXT +} ip4_mapt_next_t; + +typedef enum { + IP4_MAPT_ICMP_NEXT_IP6_LOOKUP, + IP4_MAPT_ICMP_NEXT_IP6_FRAG, + IP4_MAPT_ICMP_NEXT_DROP, + IP4_MAPT_ICMP_N_NEXT +} ip4_mapt_icmp_next_t; + +typedef enum { + IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP, + IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG, + IP4_MAPT_TCP_UDP_NEXT_DROP, + IP4_MAPT_TCP_UDP_N_NEXT +} ip4_mapt_tcp_udp_next_t; + +typedef enum { + IP4_MAPT_FRAGMENTED_NEXT_IP6_LOOKUP, + IP4_MAPT_FRAGMENTED_NEXT_IP6_FRAG, + IP4_MAPT_FRAGMENTED_NEXT_DROP, + IP4_MAPT_FRAGMENTED_N_NEXT +} ip4_mapt_fragmented_next_t; + +//This is used to pass information within the buffer data. +//Buffer structure being too small to contain big structures like this. +typedef CLIB_PACKED(struct { + ip6_address_t daddr; + ip6_address_t saddr; + //IPv6 header + Fragmentation header will be here + //sizeof(ip6) + sizeof(ip_frag) - sizeof(ip4) + u8 unused[28]; +}) ip4_mapt_pseudo_header_t; + +#define frag_id_4to6(id) (id) + +//TODO: Find the right place in memory for this. +static u8 icmp_to_icmp6_updater_pointer_table[] = + { 0, 1, 4, 4,~0, + ~0,~0,~0, 7, 6, + ~0,~0, 8, 8, 8, + 8, 24, 24, 24, 24 }; + + +static_always_inline int +ip4_map_fragment_cache (ip4_header_t *ip4, u16 port) +{ + u32 *ignore = NULL; + map_ip4_reass_lock(); + map_ip4_reass_t *r = map_ip4_reass_get(ip4->src_address.as_u32, ip4->dst_address.as_u32, + ip4->fragment_id, + (ip4->protocol == IP_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP6 : ip4->protocol, + &ignore); + if (r) + r->port = port; + + map_ip4_reass_unlock(); + return !r; +} + +static_always_inline i32 +ip4_map_fragment_get_port (ip4_header_t *ip4) +{ + u32 *ignore = NULL; + map_ip4_reass_lock(); + map_ip4_reass_t *r = map_ip4_reass_get(ip4->src_address.as_u32, ip4->dst_address.as_u32, + ip4->fragment_id, + (ip4->protocol == IP_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP6 : ip4->protocol, + &ignore); + i32 ret = r?r->port:-1; + map_ip4_reass_unlock(); + return ret; +} + + +/* Statelessly translates an ICMP packet into ICMPv6. + * + * Warning: The checksum will need to be recomputed. + * + */ +static_always_inline int +ip4_icmp_to_icmp6_in_place (icmp46_header_t *icmp, u32 icmp_len, + i32 *receiver_port, ip4_header_t **inner_ip4) +{ + *inner_ip4 = NULL; + switch (icmp->type) { + case ICMP4_echo_reply: + *receiver_port = ((u16 *)icmp)[2]; + icmp->type = ICMP6_echo_reply; + break; + case ICMP4_echo_request: + *receiver_port = ((u16 *)icmp)[2]; + icmp->type = ICMP6_echo_request; + break; + case ICMP4_destination_unreachable: + *inner_ip4 = (ip4_header_t *)(((u8 *) icmp) + 8); + *receiver_port = ip4_get_port(*inner_ip4, MAP_SENDER, icmp_len - 8); + + switch (icmp->code) { + case ICMP4_destination_unreachable_destination_unreachable_net: //0 + case ICMP4_destination_unreachable_destination_unreachable_host: //1 + icmp->type = ICMP6_destination_unreachable; + icmp->code = ICMP6_destination_unreachable_no_route_to_destination; + break; + case ICMP4_destination_unreachable_protocol_unreachable: //2 + icmp->type = ICMP6_parameter_problem; + icmp->code = ICMP6_parameter_problem_unrecognized_next_header; + break; + case ICMP4_destination_unreachable_port_unreachable: //3 + icmp->type = ICMP6_destination_unreachable; + icmp->code = ICMP6_destination_unreachable_port_unreachable; + break; + case ICMP4_destination_unreachable_fragmentation_needed_and_dont_fragment_set: //4 + icmp->type = ICMP6_packet_too_big; + icmp->code = 0; + { + u32 advertised_mtu = clib_net_to_host_u32(*((u32 *)(icmp + 1))); + if (advertised_mtu) + advertised_mtu += 20; + else + advertised_mtu = 1000; //FIXME ! (RFC 1191 - plateau value) + + //FIXME: = minimum(advertised MTU+20, MTU_of_IPv6_nexthop, (MTU_of_IPv4_nexthop)+20) + *((u32 *)(icmp + 1)) = clib_host_to_net_u32(advertised_mtu); + } + break; + + case ICMP4_destination_unreachable_source_route_failed: //5 + case ICMP4_destination_unreachable_destination_network_unknown: //6 + case ICMP4_destination_unreachable_destination_host_unknown: //7 + case ICMP4_destination_unreachable_source_host_isolated: //8 + case ICMP4_destination_unreachable_network_unreachable_for_type_of_service: //11 + case ICMP4_destination_unreachable_host_unreachable_for_type_of_service: //12 + icmp->type = ICMP6_destination_unreachable; + icmp->code = ICMP6_destination_unreachable_no_route_to_destination; + break; + case ICMP4_destination_unreachable_network_administratively_prohibited: //9 + case ICMP4_destination_unreachable_host_administratively_prohibited: //10 + case ICMP4_destination_unreachable_communication_administratively_prohibited: //13 + case ICMP4_destination_unreachable_precedence_cutoff_in_effect: //15 + icmp->type = ICMP6_destination_unreachable; + icmp->code = ICMP6_destination_unreachable_destination_administratively_prohibited; + break; + case ICMP4_destination_unreachable_host_precedence_violation: //14 + default: + return -1; + } + break; + + case ICMP4_time_exceeded: //11 + *inner_ip4 = (ip4_header_t *)(((u8 *) icmp) + 8); + *receiver_port = ip4_get_port(*inner_ip4, MAP_SENDER, icmp_len - 8); + icmp->type = ICMP6_time_exceeded; + //icmp->code = icmp->code //unchanged + break; + + case ICMP4_parameter_problem: + *inner_ip4 = (ip4_header_t *)(((u8 *) icmp) + 8); + *receiver_port = ip4_get_port(*inner_ip4, MAP_SENDER, icmp_len - 8); + + switch (icmp->code) { + case ICMP4_parameter_problem_pointer_indicates_error: + case ICMP4_parameter_problem_bad_length: + icmp->type = ICMP6_parameter_problem; + icmp->code = ICMP6_parameter_problem_erroneous_header_field; + { + u8 ptr = icmp_to_icmp6_updater_pointer_table[*((u8 *)(icmp + 1))]; + if (ptr == 0xff) + return -1; + + *((u32 *)(icmp + 1)) = clib_host_to_net_u32(ptr); + } + break; + default: + //All other codes cause dropping the packet + return -1; + } + break; + + default: + //All other types cause dropping the packet + return -1; + break; + } + return 0; +} + +static_always_inline void +_ip4_map_t_icmp (map_domain_t *d, vlib_buffer_t *p, u8 *error) +{ + ip4_header_t *ip4, *inner_ip4; + ip6_header_t *ip6, *inner_ip6; + u32 ip_len; + icmp46_header_t *icmp; + i32 recv_port; + ip_csum_t csum; + u16 *inner_L4_checksum = 0; + ip6_frag_hdr_t *inner_frag; + u32 inner_frag_id; + u32 inner_frag_offset; + u8 inner_frag_more; + + ip4 = vlib_buffer_get_current(p); + ip_len = clib_net_to_host_u16(ip4->length); + ASSERT(ip_len <= p->current_length); + + icmp = (icmp46_header_t *)(ip4 + 1); + if (ip4_icmp_to_icmp6_in_place(icmp, ip_len - sizeof(*ip4), + &recv_port, &inner_ip4)) { + *error = MAP_ERROR_ICMP; + return; + } + + if (recv_port < 0) { + // In case of 1:1 mapping, we don't care about the port + if(d->ea_bits_len == 0 && d->rules) { + recv_port = 0; + } else { + *error = MAP_ERROR_ICMP; + return; + } + } + + if (inner_ip4) { + //We have 2 headers to translate. + //We need to make some room in the middle of the packet + + if (PREDICT_FALSE(ip4_is_fragment(inner_ip4))) { + //Here it starts getting really tricky + //We will add a fragmentation header in the inner packet + + if (!ip4_is_first_fragment(inner_ip4)) { + //For now we do not handle unless it is the first fragment + //Ideally we should handle the case as we are in slow path already + *error = MAP_ERROR_FRAGMENTED; + return; + } + + vlib_buffer_advance(p, - 2*(sizeof(*ip6) - sizeof(*ip4)) - sizeof(*inner_frag)); + ip6 = vlib_buffer_get_current(p); + memcpy(u8_ptr_add(ip6, sizeof(*ip6) - sizeof(*ip4)), ip4, 20 + 8); + ip4 = (ip4_header_t *) u8_ptr_add(ip6, sizeof(*ip6) - sizeof(*ip4)); + icmp = (icmp46_header_t *) (ip4 + 1); + + inner_ip6 = (ip6_header_t *) u8_ptr_add(inner_ip4, sizeof(*ip4) - sizeof(*ip6) - sizeof(*inner_frag)); + inner_frag = (ip6_frag_hdr_t *) u8_ptr_add(inner_ip6, sizeof(*inner_ip6)); + ip6->payload_length = u16_net_add(ip4->length, sizeof(*ip6) - 2*sizeof(*ip4) + sizeof(*inner_frag)); + inner_frag_id = frag_id_4to6(inner_ip4->fragment_id); + inner_frag_offset = ip4_get_fragment_offset(inner_ip4); + inner_frag_more = !!(inner_ip4->flags_and_fragment_offset & clib_net_to_host_u16(IP4_HEADER_FLAG_MORE_FRAGMENTS)); + } else { + vlib_buffer_advance(p, - 2*(sizeof(*ip6) - sizeof(*ip4))); + ip6 = vlib_buffer_get_current(p); + memcpy(u8_ptr_add(ip6, sizeof(*ip6) - sizeof(*ip4)), ip4, 20 + 8); + ip4 = (ip4_header_t *) u8_ptr_add(ip6, sizeof(*ip6) - sizeof(*ip4)); + icmp = (icmp46_header_t *) u8_ptr_add(ip4, sizeof(*ip4)); + inner_ip6 = (ip6_header_t *) u8_ptr_add(inner_ip4, sizeof(*ip4) - sizeof(*ip6)); + ip6->payload_length = u16_net_add(ip4->length, sizeof(*ip6) - 2*sizeof(*ip4)); + inner_frag = NULL; + } + + if (PREDICT_TRUE(inner_ip4->protocol == IP_PROTOCOL_TCP)) { + inner_L4_checksum = &((tcp_header_t *) (inner_ip4 + 1))->checksum; + *inner_L4_checksum = ip_csum_fold(ip_csum_sub_even(*inner_L4_checksum, *((u64 *) (&inner_ip4->src_address)))); + } else if (PREDICT_TRUE(inner_ip4->protocol == IP_PROTOCOL_UDP)) { + inner_L4_checksum = &((udp_header_t *) (inner_ip4 + 1))->checksum; + if (!*inner_L4_checksum) { + //The inner packet was first translated, and therefore came from IPv6. + //As the packet was an IPv6 packet, the UDP checksum can't be NULL + *error = MAP_ERROR_ICMP; + return; + } + *inner_L4_checksum = ip_csum_fold(ip_csum_sub_even(*inner_L4_checksum, *((u64 *)(&inner_ip4->src_address)))); + } else if (inner_ip4->protocol == IP_PROTOCOL_ICMP) { + //We have an ICMP inside an ICMP + //It needs to be translated, but not for error ICMP messages + icmp46_header_t *inner_icmp = (icmp46_header_t *) (inner_ip4 + 1); + csum = inner_icmp->checksum; + //Only types ICMP4_echo_request and ICMP4_echo_reply are handled by ip4_icmp_to_icmp6_in_place + csum = ip_csum_sub_even(csum, *((u16 *)inner_icmp)); + inner_icmp->type = (inner_icmp->type == ICMP4_echo_request)? + ICMP6_echo_request:ICMP6_echo_reply; + csum = ip_csum_add_even(csum, *((u16 *)inner_icmp)); + csum = ip_csum_add_even(csum, clib_host_to_net_u16(IP_PROTOCOL_ICMP6)); + csum = ip_csum_add_even(csum, inner_ip4->length - sizeof(*inner_ip4)); + inner_icmp->checksum = ip_csum_fold(csum); + inner_L4_checksum = &inner_icmp->checksum; + inner_ip4->protocol = IP_PROTOCOL_ICMP6; + } else { + ASSERT(0); // We had a port from that, so it is udp or tcp or ICMP + } + + //FIXME: Security check with the port found in the inner packet + + csum = *inner_L4_checksum; //Initial checksum of the inner L4 header + //FIXME: Shouldn't we remove ip addresses from there ? + + inner_ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32((6 << 28) + (inner_ip4->tos << 20)); + inner_ip6->payload_length = u16_net_add(inner_ip4->length, - sizeof(*inner_ip4)); + inner_ip6->hop_limit = inner_ip4->ttl; + inner_ip6->protocol = inner_ip4->protocol; + + //Note that the source address is within the domain + //while the destination address is the one outside the domain + ip4_map_t_embedded_address(d, &inner_ip6->dst_address, &inner_ip4->dst_address); + inner_ip6->src_address.as_u64[0] = map_get_pfx_net(d, inner_ip4->src_address.as_u32, recv_port); + inner_ip6->src_address.as_u64[1] = map_get_sfx_net(d, inner_ip4->src_address.as_u32, recv_port); + + if (PREDICT_FALSE(inner_frag != NULL)) { + inner_frag->next_hdr = inner_ip6->protocol; + inner_frag->identification = inner_frag_id; + inner_frag->rsv = 0; + inner_frag->fragment_offset_and_more = ip6_frag_hdr_offset_and_more(inner_frag_offset, inner_frag_more); + inner_ip6->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION; + inner_ip6->payload_length = clib_host_to_net_u16( + clib_net_to_host_u16(inner_ip6->payload_length) + sizeof(*inner_frag)); + } + + csum = ip_csum_add_even(csum, inner_ip6->src_address.as_u64[0]); + csum = ip_csum_add_even(csum, inner_ip6->src_address.as_u64[1]); + csum = ip_csum_add_even(csum, inner_ip6->dst_address.as_u64[0]); + csum = ip_csum_add_even(csum, inner_ip6->dst_address.as_u64[1]); + *inner_L4_checksum = ip_csum_fold(csum); + + } else { + vlib_buffer_advance(p, sizeof(*ip4) - sizeof(*ip6)); + ip6 = vlib_buffer_get_current(p); + ip6->payload_length = clib_host_to_net_u16(clib_net_to_host_u16(ip4->length) - sizeof(*ip4)); + } + + //Translate outer IPv6 + ip6->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32((6 << 28) + (ip4->tos << 20)); + + ip6->hop_limit = ip4->ttl; + ip6->protocol = IP_PROTOCOL_ICMP6; + + ip4_map_t_embedded_address(d, &ip6->src_address, &ip4->src_address); + ip6->dst_address.as_u64[0] = map_get_pfx_net(d, ip4->dst_address.as_u32, recv_port); + ip6->dst_address.as_u64[1] = map_get_sfx_net(d, ip4->dst_address.as_u32, recv_port); + + //Truncate when the packet exceeds the minimal IPv6 MTU + if (p->current_length > 1280) { + ip6->payload_length = clib_host_to_net_u16(1280 - sizeof(*ip6)); + p->current_length = 1280; //Looks too simple to be correct... + } + + //TODO: We could do an easy diff-checksum for echo requests/replies + //Recompute ICMP checksum + icmp->checksum = 0; + csum = ip_csum_with_carry(0, ip6->payload_length); + csum = ip_csum_with_carry(csum, clib_host_to_net_u16(ip6->protocol)); + csum = ip_csum_with_carry(csum, ip6->src_address.as_u64[0]); + csum = ip_csum_with_carry(csum, ip6->src_address.as_u64[1]); + csum = ip_csum_with_carry(csum, ip6->dst_address.as_u64[0]); + csum = ip_csum_with_carry(csum, ip6->dst_address.as_u64[1]); + csum = ip_incremental_checksum(csum, icmp, clib_net_to_host_u16(ip6->payload_length)); + icmp->checksum = ~ip_csum_fold (csum); +} + +static uword +ip4_map_t_icmp (vlib_main_t *vm, + vlib_node_runtime_t *node, + vlib_frame_t *frame) +{ + u32 n_left_from, *from, next_index, *to_next, n_left_to_next; + vlib_node_runtime_t *error_node = vlib_node_get_runtime(vm, ip4_map_t_icmp_node.index); + from = vlib_frame_vector_args(frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + vlib_combined_counter_main_t *cm = map_main.domain_counters; + u32 cpu_index = os_get_cpu_number(); + + while (n_left_from > 0) { + 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 pi0; + vlib_buffer_t *p0; + ip4_mapt_icmp_next_t next0; + u8 error0; + map_domain_t *d0; + u16 len0; + + next0 = IP4_MAPT_ICMP_NEXT_IP6_LOOKUP; + pi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next +=1; + n_left_to_next -= 1; + error0 = MAP_ERROR_NONE; + + p0 = vlib_get_buffer(vm, pi0); + vlib_buffer_advance(p0, sizeof(ip4_mapt_pseudo_header_t)); //The pseudo-header is not used + len0 = clib_net_to_host_u16(((ip4_header_t *)vlib_buffer_get_current(p0))->length); + d0 = pool_elt_at_index(map_main.domains, vnet_buffer(p0)->map_t.map_domain_index); + _ip4_map_t_icmp(d0, p0, &error0); + + if(vnet_buffer(p0)->map_t.mtu < p0->current_length) { + vnet_buffer(p0)->ip_frag.header_offset = 0; + vnet_buffer(p0)->ip_frag.mtu = vnet_buffer(p0)->map_t.mtu; + vnet_buffer(p0)->ip_frag.next_index = IP6_FRAG_NEXT_IP6_LOOKUP; + next0 = IP4_MAPT_ICMP_NEXT_IP6_FRAG; + } + if (PREDICT_TRUE(error0 == MAP_ERROR_NONE)) { + vlib_increment_combined_counter(cm + MAP_DOMAIN_COUNTER_TX, cpu_index, + vnet_buffer(p0)->map_t.map_domain_index, 1, + len0); + } else { + next0 = IP4_MAPT_ICMP_NEXT_DROP; + } + p0->error = error_node->errors[error0]; + vlib_validate_buffer_enqueue_x1(vm, node, next_index, + to_next, n_left_to_next, pi0, + next0); + } + vlib_put_next_frame(vm, node, next_index, n_left_to_next); + } + return frame->n_vectors; +} + +static uword +ip4_map_t_fragmented (vlib_main_t *vm, + vlib_node_runtime_t *node, + vlib_frame_t *frame) +{ + u32 n_left_from, *from, next_index, *to_next, n_left_to_next; + from = vlib_frame_vector_args(frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) { + 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 pi0; + vlib_buffer_t *p0; + ip4_header_t *ip40; + ip6_header_t *ip60; + ip6_frag_hdr_t *frag0; + ip4_mapt_pseudo_header_t *pheader0; + ip4_mapt_fragmented_next_t next0; + + next0 = IP4_MAPT_FRAGMENTED_NEXT_IP6_LOOKUP; + pi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next +=1; + n_left_to_next -= 1; + + p0 = vlib_get_buffer(vm, pi0); + + //Accessing pseudo header + pheader0 = vlib_buffer_get_current(p0); + vlib_buffer_advance(p0, sizeof(*pheader0)); + + //Accessing ip4 header + ip40 = vlib_buffer_get_current(p0); + frag0 = (ip6_frag_hdr_t *) u8_ptr_add(ip40, sizeof(*ip40) - sizeof(*frag0)); + ip60 = (ip6_header_t *) u8_ptr_add(ip40, sizeof(*ip40) - sizeof(*frag0) - sizeof(*ip60)); + vlib_buffer_advance(p0, sizeof(*ip40) - sizeof(*ip60) - sizeof(*frag0)); + + //We know that the protocol was one of ICMP, TCP or UDP + //because the first fragment was found and cached + frag0->next_hdr = (ip40->protocol == IP_PROTOCOL_ICMP) ? IP_PROTOCOL_ICMP6 : ip40->protocol; + frag0->identification = frag_id_4to6(ip40->fragment_id); + frag0->rsv = 0; + frag0->fragment_offset_and_more = ip6_frag_hdr_offset_and_more( + ip4_get_fragment_offset(ip40), + clib_net_to_host_u16(ip40->flags_and_fragment_offset) & IP4_HEADER_FLAG_MORE_FRAGMENTS); + + ip60->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32((6 << 28) + (ip40->tos << 20)); + ip60->payload_length = clib_host_to_net_u16(clib_net_to_host_u16(ip40->length) - sizeof(*ip40) + sizeof(*frag0)); + ip60->hop_limit = ip40->ttl; + ip60->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION; + ip60->dst_address.as_u64[0] = pheader0->daddr.as_u64[0]; + ip60->dst_address.as_u64[1] = pheader0->daddr.as_u64[1]; + ip60->src_address.as_u64[0] = pheader0->saddr.as_u64[0]; + ip60->src_address.as_u64[1] = pheader0->saddr.as_u64[1]; + + if(vnet_buffer(p0)->map_t.mtu < p0->current_length) { + vnet_buffer(p0)->ip_frag.header_offset = 0; + vnet_buffer(p0)->ip_frag.mtu = vnet_buffer(p0)->map_t.mtu; + vnet_buffer(p0)->ip_frag.next_index = IP6_FRAG_NEXT_IP6_LOOKUP; + next0 = IP4_MAPT_FRAGMENTED_NEXT_IP6_FRAG; + } + + vlib_validate_buffer_enqueue_x1(vm, node, next_index, + to_next, n_left_to_next, pi0, + next0); + } + vlib_put_next_frame(vm, node, next_index, n_left_to_next); + } + return frame->n_vectors; +} + +static uword +ip4_map_t_tcp_udp(vlib_main_t *vm, + vlib_node_runtime_t *node, + vlib_frame_t *frame) +{ + u32 n_left_from, *from, next_index, *to_next, n_left_to_next; + from = vlib_frame_vector_args(frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) { + vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next); + +#ifdef IP4_MAP_T_DUAL_LOOP + while (n_left_from >= 4 && n_left_to_next >= 2) { + u32 pi0, pi1; + vlib_buffer_t *p0, *p1; + ip4_header_t *ip40, *ip41; + ip6_header_t *ip60, *ip61; + ip_csum_t csum0, csum1; + u16 *checksum0, *checksum1; + ip6_frag_hdr_t *frag0, *frag1; + u32 frag_id0, frag_id1; + ip4_mapt_pseudo_header_t *pheader0, *pheader1; + ip4_mapt_tcp_udp_next_t next0, next1; + + pi0 = to_next[0] = from[0]; + pi1 = to_next[1] = from[1]; + from += 2; + n_left_from -= 2; + to_next +=2; + n_left_to_next -= 2; + + next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP; + next1 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP; + p0 = vlib_get_buffer(vm, pi0); + p1 = vlib_get_buffer(vm, pi1); + + //Accessing pseudo header + pheader0 = vlib_buffer_get_current(p0); + pheader1 = vlib_buffer_get_current(p1); + vlib_buffer_advance(p0, sizeof(*pheader0)); + vlib_buffer_advance(p1, sizeof(*pheader1)); + + //Accessing ip4 header + ip40 = vlib_buffer_get_current(p0); + ip41 = vlib_buffer_get_current(p1); + checksum0 = (u16 *) u8_ptr_add(ip40, vnet_buffer(p0)->map_t.checksum_offset); + checksum1 = (u16 *) u8_ptr_add(ip41, vnet_buffer(p1)->map_t.checksum_offset); + + //UDP checksum is optional over IPv4 but mandatory for IPv6 + //We do not check udp->length sanity but use our safe computed value instead + if (PREDICT_FALSE(!*checksum0 && ip40->protocol == IP_PROTOCOL_UDP)) { + u16 udp_len = clib_host_to_net_u16(ip40->length) - sizeof(*ip40); + udp_header_t *udp = (udp_header_t *) u8_ptr_add(ip40, sizeof(*ip40)); + ip_csum_t csum; + csum = ip_incremental_checksum(0, udp, udp_len); + csum = ip_csum_with_carry(csum, clib_host_to_net_u16(udp_len)); + csum = ip_csum_with_carry(csum, clib_host_to_net_u16(IP_PROTOCOL_UDP)); + csum = ip_csum_with_carry(csum, *((u64 *)(&ip40->src_address))); + *checksum0 = ~ip_csum_fold(csum); + } + if (PREDICT_FALSE(!*checksum1 && ip41->protocol == IP_PROTOCOL_UDP)) { + u16 udp_len = clib_host_to_net_u16(ip41->length) - sizeof(*ip40); + udp_header_t *udp = (udp_header_t *) u8_ptr_add(ip41, sizeof(*ip40)); + ip_csum_t csum; + csum = ip_incremental_checksum(0, udp, udp_len); + csum = ip_csum_with_carry(csum, clib_host_to_net_u16(udp_len)); + csum = ip_csum_with_carry(csum, clib_host_to_net_u16(IP_PROTOCOL_UDP)); + csum = ip_csum_with_carry(csum, *((u64 *)(&ip41->src_address))); + *checksum1 = ~ip_csum_fold(csum); + } + + csum0 = ip_csum_sub_even(*checksum0, ip40->src_address.as_u32); + csum1 = ip_csum_sub_even(*checksum1, ip41->src_address.as_u32); + csum0 = ip_csum_sub_even(csum0, ip40->dst_address.as_u32); + csum1 = ip_csum_sub_even(csum1, ip41->dst_address.as_u32); + + // Deal with fragmented packets + if (PREDICT_FALSE(ip40->flags_and_fragment_offset & + clib_host_to_net_u16(IP4_HEADER_FLAG_MORE_FRAGMENTS))) { + ip60 = (ip6_header_t *) u8_ptr_add(ip40, sizeof(*ip40) - sizeof(*ip60) - sizeof(*frag0)); + frag0 = (ip6_frag_hdr_t *) u8_ptr_add(ip40, sizeof(*ip40) - sizeof(*frag0)); + frag_id0 = frag_id_4to6(ip40->fragment_id); + vlib_buffer_advance(p0, sizeof(*ip40) - sizeof(*ip60) - sizeof(*frag0)); + } else { + ip60 = (ip6_header_t *) (((u8 *)ip40) + sizeof(*ip40) - sizeof(*ip60)); + vlib_buffer_advance(p0, sizeof(*ip40) - sizeof(*ip60)); + frag0 = NULL; + } + + if (PREDICT_FALSE(ip41->flags_and_fragment_offset & + clib_host_to_net_u16(IP4_HEADER_FLAG_MORE_FRAGMENTS))) { + ip61 = (ip6_header_t *) u8_ptr_add(ip41, sizeof(*ip40) - sizeof(*ip60) - sizeof(*frag0)); + frag1 = (ip6_frag_hdr_t *) u8_ptr_add(ip41, sizeof(*ip40) - sizeof(*frag0)); + frag_id1 = frag_id_4to6(ip41->fragment_id); + vlib_buffer_advance(p1, sizeof(*ip40) - sizeof(*ip60) - sizeof(*frag0)); + } else { + ip61 = (ip6_header_t *) (((u8 *)ip41) + sizeof(*ip40) - sizeof(*ip60)); + vlib_buffer_advance(p1, sizeof(*ip40) - sizeof(*ip60)); + frag1 = NULL; + } + + ip60->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32((6 << 28) + (ip40->tos << 20)); + ip61->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32((6 << 28) + (ip41->tos << 20)); + ip60->payload_length = u16_net_add(ip40->length, - sizeof(*ip40)); + ip61->payload_length = u16_net_add(ip41->length, - sizeof(*ip40)); + ip60->hop_limit = ip40->ttl; + ip61->hop_limit = ip41->ttl; + ip60->protocol = ip40->protocol; + ip61->protocol = ip41->protocol; + + if (PREDICT_FALSE(frag0 != NULL)) { + frag0->next_hdr = ip60->protocol; + frag0->identification = frag_id0; + frag0->rsv = 0; + frag0->fragment_offset_and_more = ip6_frag_hdr_offset_and_more(0, 1); + ip60->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION; + ip60->payload_length = u16_net_add(ip60->payload_length, sizeof(*frag0)); + } + + if (PREDICT_FALSE(frag1 != NULL)) { + frag1->next_hdr = ip61->protocol; + frag1->identification = frag_id1; + frag1->rsv = 0; + frag1->fragment_offset_and_more = ip6_frag_hdr_offset_and_more(0, 1); + ip61->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION; + ip61->payload_length = u16_net_add(ip61->payload_length, sizeof(*frag0)); + } + + //Finally copying the address + ip60->dst_address.as_u64[0] = pheader0->daddr.as_u64[0]; + ip61->dst_address.as_u64[0] = pheader1->daddr.as_u64[0]; + ip60->dst_address.as_u64[1] = pheader0->daddr.as_u64[1]; + ip61->dst_address.as_u64[1] = pheader1->daddr.as_u64[1]; + ip60->src_address.as_u64[0] = pheader0->saddr.as_u64[0]; + ip61->src_address.as_u64[0] = pheader1->saddr.as_u64[0]; + ip60->src_address.as_u64[1] = pheader0->saddr.as_u64[1]; + ip61->src_address.as_u64[1] = pheader1->saddr.as_u64[1]; + + csum0 = ip_csum_add_even(csum0, ip60->src_address.as_u64[0]); + csum1 = ip_csum_add_even(csum1, ip61->src_address.as_u64[0]); + csum0 = ip_csum_add_even(csum0, ip60->src_address.as_u64[1]); + csum1 = ip_csum_add_even(csum1, ip61->src_address.as_u64[1]); + csum0 = ip_csum_add_even(csum0, ip60->dst_address.as_u64[0]); + csum1 = ip_csum_add_even(csum1, ip61->dst_address.as_u64[0]); + csum0 = ip_csum_add_even(csum0, ip60->dst_address.as_u64[1]); + csum1 = ip_csum_add_even(csum1, ip61->dst_address.as_u64[1]); + *checksum0 = ip_csum_fold(csum0); + *checksum1 = ip_csum_fold(csum1); + + if(vnet_buffer(p0)->map_t.mtu < p0->current_length) { + vnet_buffer(p0)->ip_frag.header_offset = 0; + vnet_buffer(p0)->ip_frag.mtu = vnet_buffer(p0)->map_t.mtu; + vnet_buffer(p0)->ip_frag.next_index = IP6_FRAG_NEXT_IP6_LOOKUP; + next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG; + } + + if(vnet_buffer(p1)->map_t.mtu < p1->current_length) { + vnet_buffer(p1)->ip_frag.header_offset = 0; + vnet_buffer(p1)->ip_frag.mtu = vnet_buffer(p1)->map_t.mtu; + vnet_buffer(p1)->ip_frag.next_index = IP6_FRAG_NEXT_IP6_LOOKUP; + next1 = IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG; + } + + vlib_validate_buffer_enqueue_x2(vm, node, next_index, + to_next, n_left_to_next, pi0, pi1, + next0, next1); + } +#endif + + while (n_left_from > 0 && n_left_to_next > 0) { + u32 pi0; + vlib_buffer_t *p0; + ip4_header_t *ip40; + ip6_header_t *ip60; + ip_csum_t csum0; + u16 *checksum0; + ip6_frag_hdr_t *frag0; + u32 frag_id0; + ip4_mapt_pseudo_header_t *pheader0; + ip4_mapt_tcp_udp_next_t next0; + + pi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next +=1; + n_left_to_next -= 1; + + next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP; + p0 = vlib_get_buffer(vm, pi0); + + //Accessing pseudo header + pheader0 = vlib_buffer_get_current(p0); + vlib_buffer_advance(p0, sizeof(*pheader0)); + + //Accessing ip4 header + ip40 = vlib_buffer_get_current(p0); + checksum0 = (u16 *) u8_ptr_add(ip40, vnet_buffer(p0)->map_t.checksum_offset); + + //UDP checksum is optional over IPv4 but mandatory for IPv6 + //We do not check udp->length sanity but use our safe computed value instead + if (PREDICT_FALSE(!*checksum0 && ip40->protocol == IP_PROTOCOL_UDP)) { + u16 udp_len = clib_host_to_net_u16(ip40->length) - sizeof(*ip40); + udp_header_t *udp = (udp_header_t *) u8_ptr_add(ip40, sizeof(*ip40)); + ip_csum_t csum; + csum = ip_incremental_checksum(0, udp, udp_len); + csum = ip_csum_with_carry(csum, clib_host_to_net_u16(udp_len)); + csum = ip_csum_with_carry(csum, clib_host_to_net_u16(IP_PROTOCOL_UDP)); + csum = ip_csum_with_carry(csum, *((u64 *)(&ip40->src_address))); + *checksum0 = ~ip_csum_fold(csum); + } + + csum0 = ip_csum_sub_even(*checksum0, ip40->src_address.as_u32); + csum0 = ip_csum_sub_even(csum0, ip40->dst_address.as_u32); + + // Deal with fragmented packets + if (PREDICT_FALSE(ip40->flags_and_fragment_offset & + clib_host_to_net_u16(IP4_HEADER_FLAG_MORE_FRAGMENTS))) { + ip60 = (ip6_header_t *) u8_ptr_add(ip40, sizeof(*ip40) - sizeof(*ip60) - sizeof(*frag0)); + frag0 = (ip6_frag_hdr_t *) u8_ptr_add(ip40, sizeof(*ip40) - sizeof(*frag0)); + frag_id0 = frag_id_4to6(ip40->fragment_id); + vlib_buffer_advance(p0, sizeof(*ip40) - sizeof(*ip60) - sizeof(*frag0)); + } else { + ip60 = (ip6_header_t *) (((u8 *)ip40) + sizeof(*ip40) - sizeof(*ip60)); + vlib_buffer_advance(p0, sizeof(*ip40) - sizeof(*ip60)); + frag0 = NULL; + } + + ip60->ip_version_traffic_class_and_flow_label = clib_host_to_net_u32((6 << 28) + (ip40->tos << 20)); + ip60->payload_length = u16_net_add(ip40->length, - sizeof(*ip40)); + ip60->hop_limit = ip40->ttl; + ip60->protocol = ip40->protocol; + + if (PREDICT_FALSE(frag0 != NULL)) { + frag0->next_hdr = ip60->protocol; + frag0->identification = frag_id0; + frag0->rsv = 0; + frag0->fragment_offset_and_more = ip6_frag_hdr_offset_and_more(0, 1); + ip60->protocol = IP_PROTOCOL_IPV6_FRAGMENTATION; + ip60->payload_length = u16_net_add(ip60->payload_length, sizeof(*frag0)); + } + + //Finally copying the address + ip60->dst_address.as_u64[0] = pheader0->daddr.as_u64[0]; + ip60->dst_address.as_u64[1] = pheader0->daddr.as_u64[1]; + ip60->src_address.as_u64[0] = pheader0->saddr.as_u64[0]; + ip60->src_address.as_u64[1] = pheader0->saddr.as_u64[1]; + + csum0 = ip_csum_add_even(csum0, ip60->src_address.as_u64[0]); + csum0 = ip_csum_add_even(csum0, ip60->src_address.as_u64[1]); + csum0 = ip_csum_add_even(csum0, ip60->dst_address.as_u64[0]); + csum0 = ip_csum_add_even(csum0, ip60->dst_address.as_u64[1]); + *checksum0 = ip_csum_fold(csum0); + + if(vnet_buffer(p0)->map_t.mtu < p0->current_length) { + //Send to fragmentation node if necessary + vnet_buffer(p0)->ip_frag.header_offset = 0; + vnet_buffer(p0)->ip_frag.mtu = vnet_buffer(p0)->map_t.mtu; + vnet_buffer(p0)->ip_frag.next_index = IP6_FRAG_NEXT_IP6_LOOKUP; + next0 = IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG; + } + + vlib_validate_buffer_enqueue_x1(vm, node, next_index, + to_next, n_left_to_next, pi0, + next0); + } + vlib_put_next_frame(vm, node, next_index, n_left_to_next); + } + + return frame->n_vectors; +} + +static_always_inline void +ip4_map_t_classify(vlib_buffer_t *p0, map_domain_t *d0, ip4_header_t *ip40, u16 ip4_len0, + i32 *dst_port0, u8 *error0, ip4_mapt_next_t *next0) +{ + if (PREDICT_FALSE(ip4_get_fragment_offset(ip40))) { + *next0 = IP4_MAPT_NEXT_MAPT_FRAGMENTED; + if(d0->ea_bits_len == 0 && d0->rules) { + *dst_port0 = 0; + } else { + *dst_port0 = ip4_map_fragment_get_port(ip40); + *error0 = (*dst_port0 == -1) ? MAP_ERROR_FRAGMENT_MEMORY : *error0; + } + } else if (PREDICT_TRUE(ip40->protocol == IP_PROTOCOL_TCP)) { + vnet_buffer(p0)->map_t.checksum_offset = 36; + *next0 = IP4_MAPT_NEXT_MAPT_TCP_UDP; + *error0 = ip4_len0 < 40 ? MAP_ERROR_MALFORMED : *error0; + *dst_port0 = (i32) *((u16 *)u8_ptr_add(ip40, sizeof(*ip40) + 2)); + } else if (PREDICT_TRUE(ip40->protocol == IP_PROTOCOL_UDP)) { + vnet_buffer(p0)->map_t.checksum_offset = 26; + *next0 = IP4_MAPT_NEXT_MAPT_TCP_UDP; + *error0 = ip4_len0 < 28 ? MAP_ERROR_MALFORMED : *error0; + *dst_port0 = (i32) *((u16 *)u8_ptr_add(ip40, sizeof(*ip40) + 2)); + } else if (ip40->protocol == IP_PROTOCOL_ICMP) { + *next0 = IP4_MAPT_NEXT_MAPT_ICMP; + if(d0->ea_bits_len == 0 && d0->rules) + *dst_port0 = 0; + else if (((icmp46_header_t *) u8_ptr_add(ip40, sizeof(*ip40)))->code == ICMP4_echo_reply || + ((icmp46_header_t *) u8_ptr_add(ip40, sizeof(*ip40)))->code == ICMP4_echo_request) + *dst_port0 = (i32) *((u16 *)u8_ptr_add(ip40, sizeof(*ip40) + 6)); + } else { + *error0 = MAP_ERROR_BAD_PROTOCOL; + } +} + +static uword +ip4_map_t (vlib_main_t *vm, + vlib_node_runtime_t *node, + vlib_frame_t *frame) +{ + u32 n_left_from, *from, next_index, *to_next, n_left_to_next; + vlib_node_runtime_t *error_node = vlib_node_get_runtime(vm, ip4_map_t_node.index); + from = vlib_frame_vector_args(frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + vlib_combined_counter_main_t *cm = map_main.domain_counters; + u32 cpu_index = os_get_cpu_number(); + + while (n_left_from > 0) { + vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next); + +#ifdef IP4_MAP_T_DUAL_LOOP + while (n_left_from >= 4 && n_left_to_next >= 2) { + u32 pi0, pi1; + vlib_buffer_t *p0, *p1; + ip4_header_t *ip40, *ip41; + map_domain_t *d0, *d1; + ip4_mapt_next_t next0, next1; + u16 ip4_len0, ip4_len1; + u8 error0, error1; + i32 dst_port0, dst_port1; + ip4_mapt_pseudo_header_t *pheader0, *pheader1; + + pi0 = to_next[0] = from[0]; + pi1 = to_next[1] = from[1]; + from += 2; + n_left_from -= 2; + to_next +=2; + n_left_to_next -= 2; + error0 = MAP_ERROR_NONE; + error1 = MAP_ERROR_NONE; + + p0 = vlib_get_buffer(vm, pi0); + p1 = vlib_get_buffer(vm, pi1); + ip40 = vlib_buffer_get_current(p0); + ip41 = vlib_buffer_get_current(p1); + ip4_len0 = clib_host_to_net_u16(ip40->length); + ip4_len1 = clib_host_to_net_u16(ip41->length); + + if (PREDICT_FALSE(p0->current_length < ip4_len0 || + ip40->ip_version_and_header_length != 0x45)) { + error0 = MAP_ERROR_UNKNOWN; + next0 = IP4_MAPT_NEXT_DROP; + } + + if (PREDICT_FALSE(p1->current_length < ip4_len1 || + ip41->ip_version_and_header_length != 0x45)) { + error1 = MAP_ERROR_UNKNOWN; + next1 = IP4_MAPT_NEXT_DROP; + } + + d0 = ip4_map_get_domain(vnet_buffer(p0)->ip.adj_index[VLIB_TX], + &vnet_buffer(p0)->map_t.map_domain_index); + d1 = ip4_map_get_domain(vnet_buffer(p1)->ip.adj_index[VLIB_TX], + &vnet_buffer(p1)->map_t.map_domain_index); + + vnet_buffer(p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0; + vnet_buffer(p1)->map_t.mtu = d1->mtu ? d1->mtu : ~0; + + dst_port0 = -1; + dst_port1 = -1; + + ip4_map_t_classify(p0, d0, ip40, ip4_len0, &dst_port0, &error0, &next0); + ip4_map_t_classify(p1, d1, ip41, ip4_len1, &dst_port1, &error1, &next1); + + //Add MAP-T pseudo header in front of the packet + vlib_buffer_advance(p0, - sizeof(*pheader0)); + vlib_buffer_advance(p1, - sizeof(*pheader1)); + pheader0 = vlib_buffer_get_current(p0); + pheader1 = vlib_buffer_get_current(p1); + + //Save addresses within the packet + ip4_map_t_embedded_address(d0, &pheader0->saddr, &ip40->src_address); + ip4_map_t_embedded_address(d1, &pheader1->saddr, &ip41->src_address); + pheader0->daddr.as_u64[0] = map_get_pfx_net(d0, ip40->dst_address.as_u32, (u16)dst_port0); + pheader0->daddr.as_u64[1] = map_get_sfx_net(d0, ip40->dst_address.as_u32, (u16)dst_port0); + pheader1->daddr.as_u64[0] = map_get_pfx_net(d1, ip41->dst_address.as_u32, (u16)dst_port1); + pheader1->daddr.as_u64[1] = map_get_sfx_net(d1, ip41->dst_address.as_u32, (u16)dst_port1); + + if (PREDICT_FALSE(ip4_is_first_fragment(ip40) && (dst_port0 != -1) && + (d0->ea_bits_len != 0 || !d0->rules) && + ip4_map_fragment_cache(ip40, dst_port0))) { + error0 = MAP_ERROR_FRAGMENT_MEMORY; + } + + if (PREDICT_FALSE(ip4_is_first_fragment(ip41) && (dst_port1 != -1) && + (d1->ea_bits_len != 0 || !d1->rules) && + ip4_map_fragment_cache(ip41, dst_port1))) { + error1 = MAP_ERROR_FRAGMENT_MEMORY; + } + + if (PREDICT_TRUE(error0 == MAP_ERROR_NONE && next0 != IP4_MAPT_NEXT_MAPT_ICMP)) { + vlib_increment_combined_counter(cm + MAP_DOMAIN_COUNTER_TX, cpu_index, + vnet_buffer(p0)->map_t.map_domain_index, 1, + clib_net_to_host_u16(ip40->length)); + } + + if (PREDICT_TRUE(error1 == MAP_ERROR_NONE && next1 != IP4_MAPT_NEXT_MAPT_ICMP)) { + vlib_increment_combined_counter(cm + MAP_DOMAIN_COUNTER_TX, cpu_index, + vnet_buffer(p1)->map_t.map_domain_index, 1, + clib_net_to_host_u16(ip41->length)); + } + + next0 = (error0 != MAP_ERROR_NONE) ? IP4_MAPT_NEXT_DROP : next0; + next1 = (error1 != MAP_ERROR_NONE) ? IP4_MAPT_NEXT_DROP : next1; + p0->error = error_node->errors[error0]; + p1->error = error_node->errors[error1]; + vlib_validate_buffer_enqueue_x2(vm, node, next_index, to_next, + n_left_to_next, pi0, pi1, next0, next1); + } +#endif + + while (n_left_from > 0 && n_left_to_next > 0) { + u32 pi0; + vlib_buffer_t *p0; + ip4_header_t *ip40; + map_domain_t *d0; + ip4_mapt_next_t next0; + u16 ip4_len0; + u8 error0; + i32 dst_port0; + ip4_mapt_pseudo_header_t *pheader0; + + pi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next +=1; + n_left_to_next -= 1; + error0 = MAP_ERROR_NONE; + + p0 = vlib_get_buffer(vm, pi0); + ip40 = vlib_buffer_get_current(p0); + ip4_len0 = clib_host_to_net_u16(ip40->length); + if (PREDICT_FALSE(p0->current_length < ip4_len0 || + ip40->ip_version_and_header_length != 0x45)) { + error0 = MAP_ERROR_UNKNOWN; + next0 = IP4_MAPT_NEXT_DROP; + } + + d0 = ip4_map_get_domain(vnet_buffer(p0)->ip.adj_index[VLIB_TX], + &vnet_buffer(p0)->map_t.map_domain_index); + + vnet_buffer(p0)->map_t.mtu = d0->mtu ? d0->mtu : ~0; + + dst_port0 = -1; + ip4_map_t_classify(p0, d0, ip40, ip4_len0, &dst_port0, &error0, &next0); + + //Add MAP-T pseudo header in front of the packet + vlib_buffer_advance(p0, - sizeof(*pheader0)); + pheader0 = vlib_buffer_get_current(p0); + + //Save addresses within the packet + ip4_map_t_embedded_address(d0, &pheader0->saddr, &ip40->src_address); + pheader0->daddr.as_u64[0] = map_get_pfx_net(d0, ip40->dst_address.as_u32, (u16)dst_port0); + pheader0->daddr.as_u64[1] = map_get_sfx_net(d0, ip40->dst_address.as_u32, (u16)dst_port0); + + //It is important to cache at this stage because the result might be necessary + //for packets within the same vector. + //Actually, this approach even provides some limited out-of-order fragments support + if (PREDICT_FALSE(ip4_is_first_fragment(ip40) && (dst_port0 != -1) && + (d0->ea_bits_len != 0 || !d0->rules) && + ip4_map_fragment_cache(ip40, dst_port0))) { + error0 = MAP_ERROR_UNKNOWN; + } + + if (PREDICT_TRUE(error0 == MAP_ERROR_NONE && next0 != IP4_MAPT_NEXT_MAPT_ICMP)) { + vlib_increment_combined_counter(cm + MAP_DOMAIN_COUNTER_TX, cpu_index, + vnet_buffer(p0)->map_t.map_domain_index, 1, + clib_net_to_host_u16(ip40->length)); + } + + next0 = (error0 != MAP_ERROR_NONE) ? IP4_MAPT_NEXT_DROP : next0; + p0->error = error_node->errors[error0]; + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, pi0, + next0); + } + vlib_put_next_frame(vm, node, next_index, n_left_to_next); + } + return frame->n_vectors; +} + +static char *map_t_error_strings[] = { +#define _(sym,string) string, + foreach_map_error +#undef _ +}; + +VLIB_REGISTER_NODE(ip4_map_t_fragmented_node) = { + .function = ip4_map_t_fragmented, + .name = "ip4-map-t-fragmented", + .vector_size = sizeof(u32), + .format_trace = format_map_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = MAP_N_ERROR, + .error_strings = map_t_error_strings, + + .n_next_nodes = IP4_MAPT_FRAGMENTED_N_NEXT, + .next_nodes = { + [IP4_MAPT_FRAGMENTED_NEXT_IP6_LOOKUP] = "ip6-lookup", + [IP4_MAPT_FRAGMENTED_NEXT_IP6_FRAG] = IP6_FRAG_NODE_NAME, + [IP4_MAPT_FRAGMENTED_NEXT_DROP] = "error-drop", + }, +}; + +VLIB_REGISTER_NODE(ip4_map_t_icmp_node) = { + .function = ip4_map_t_icmp, + .name = "ip4-map-t-icmp", + .vector_size = sizeof(u32), + .format_trace = format_map_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = MAP_N_ERROR, + .error_strings = map_t_error_strings, + + .n_next_nodes = IP4_MAPT_ICMP_N_NEXT, + .next_nodes = { + [IP4_MAPT_ICMP_NEXT_IP6_LOOKUP] = "ip6-lookup", + [IP4_MAPT_ICMP_NEXT_IP6_FRAG] = IP6_FRAG_NODE_NAME, + [IP4_MAPT_ICMP_NEXT_DROP] = "error-drop", + }, +}; + +VLIB_REGISTER_NODE(ip4_map_t_tcp_udp_node) = { + .function = ip4_map_t_tcp_udp, + .name = "ip4-map-t-tcp-udp", + .vector_size = sizeof(u32), + .format_trace = format_map_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = MAP_N_ERROR, + .error_strings = map_t_error_strings, + + .n_next_nodes = IP4_MAPT_TCP_UDP_N_NEXT, + .next_nodes = { + [IP4_MAPT_TCP_UDP_NEXT_IP6_LOOKUP] = "ip6-lookup", + [IP4_MAPT_TCP_UDP_NEXT_IP6_FRAG] = IP6_FRAG_NODE_NAME, + [IP4_MAPT_TCP_UDP_NEXT_DROP] = "error-drop", + }, +}; + +VLIB_REGISTER_NODE(ip4_map_t_node) = { + .function = ip4_map_t, + .name = "ip4-map-t", + .vector_size = sizeof(u32), + .format_trace = format_map_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = MAP_N_ERROR, + .error_strings = map_t_error_strings, + + .n_next_nodes = IP4_MAPT_N_NEXT, + .next_nodes = { + [IP4_MAPT_NEXT_MAPT_TCP_UDP] = "ip4-map-t-tcp-udp", + [IP4_MAPT_NEXT_MAPT_ICMP] = "ip4-map-t-icmp", + [IP4_MAPT_NEXT_MAPT_FRAGMENTED] = "ip4-map-t-fragmented", + [IP4_MAPT_NEXT_DROP] = "error-drop", + }, +}; |