/* * node.c: ipip packet processing * * 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 aipiped 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/ipip/ipip.h> #include <vnet/ip/ip6_packet.h> #include <vnet/mpls/mpls.h> #include <vnet/pg/pg.h> #include <vppinfra/sparse_vec.h> #define foreach_ipip_input_next \ _(PUNT, "error-punt") \ _(DROP, "error-drop") \ _(IP4_INPUT, "ip4-input") \ _(IP6_INPUT, "ip6-input") typedef enum { #define _(s, n) IPIP_INPUT_NEXT_##s, foreach_ipip_input_next #undef _ IPIP_INPUT_N_NEXT, } ipip_input_next_t; typedef struct { u32 tunnel_id; u32 length; ip46_address_t src; ip46_address_t dst; u8 is_ipv6; } ipip_rx_trace_t; static u8 * format_ipip_rx_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 *); ipip_rx_trace_t *t = va_arg (*args, ipip_rx_trace_t *); s = format (s, "IPIP: tunnel %d len %d src %U dst %U", t->tunnel_id, clib_net_to_host_u16 (t->length), format_ip46_address, &t->src, IP46_TYPE_ANY, format_ip46_address, &t->dst, IP46_TYPE_ANY); return s; } always_inline uword ipip_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, bool is_ipv6) { ipip_main_t *gm = &ipip_main; u32 n_left_from, next_index, *from, *to_next, n_left_to_next; u32 tunnel_sw_if_index = ~0; u32 thread_index = vm->thread_index; u32 len; vnet_interface_main_t *im = &gm->vnet_main->interface_main; from = vlib_frame_vector_args (from_frame); n_left_from = 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 bi0; vlib_buffer_t *b0; ip4_header_t *ip40; ip6_header_t *ip60; u32 next0 = IPIP_INPUT_NEXT_DROP; ip46_address_t src0 = ip46_address_initializer, dst0 = ip46_address_initializer; ipip_transport_t transport0; u8 inner_protocol0; bi0 = to_next[0] = from[0]; from += 1; n_left_from -= 1; to_next += 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); if (is_ipv6) { ip60 = vlib_buffer_get_current (b0); /* Check for outer fragmentation */ if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION) { next0 = IPIP_INPUT_NEXT_DROP; b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET]; goto drop; } vlib_buffer_advance (b0, sizeof (*ip60)); ip_set (&src0, &ip60->src_address, false); ip_set (&dst0, &ip60->dst_address, false); inner_protocol0 = ip60->protocol; transport0 = IPIP_TRANSPORT_IP6; } else { ip40 = vlib_buffer_get_current (b0); /* Check for outer fragmentation */ if (ip40->flags_and_fragment_offset & clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS)) { next0 = IPIP_INPUT_NEXT_DROP; b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET]; goto drop; } vlib_buffer_advance (b0, sizeof (*ip40)); ip_set (&src0, &ip40->src_address, true); ip_set (&dst0, &ip40->dst_address, true); inner_protocol0 = ip40->protocol; transport0 = IPIP_TRANSPORT_IP4; } /* * Find tunnel. First a lookup for P2P tunnels, then a lookup * for multipoint tunnels */ ipip_tunnel_key_t key0 = {.transport = transport0, .fib_index = vnet_buffer (b0)->ip.fib_index, .src = dst0, .dst = src0 }; ipip_tunnel_t *t0 = ipip_tunnel_db_find (&key0); if (!t0) { ip46_address_reset (&key0.dst); t0 = ipip_tunnel_db_find (&key0); if (!t0) { next0 = IPIP_INPUT_NEXT_DROP; b0->error = node->errors[IPIP_ERROR_NO_TUNNEL]; goto drop; } } tunnel_sw_if_index = t0->sw_if_index; len = vlib_buffer_length_in_chain (vm, b0); vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index; if (inner_protocol0 == IP_PROTOCOL_IPV6) { next0 = IPIP_INPUT_NEXT_IP6_INPUT; if (t0->flags & IPIP_TUNNEL_FLAG_DECAP_COPY_ECN) { if (is_ipv6) ip6_set_ecn_network_order ((ip60 + 1), ip6_ecn_network_order (ip60)); else ip6_set_ecn_network_order ((ip6_header_t *) (ip40 + 1), ip4_header_get_ecn (ip40)); } } else if (inner_protocol0 == IP_PROTOCOL_IP_IN_IP) { next0 = IPIP_INPUT_NEXT_IP4_INPUT; if (t0->flags & IPIP_TUNNEL_FLAG_DECAP_COPY_ECN) { if (is_ipv6) ip4_header_set_ecn_w_chksum ((ip4_header_t *) (ip60 + 1), ip6_ecn_network_order (ip60)); else ip4_header_set_ecn_w_chksum (ip40 + 1, ip4_header_get_ecn (ip40)); } } if (!is_ipv6 && t0->mode == IPIP_MODE_6RD && t0->sixrd.security_check) { ip6_header_t *inner_ip60 = vlib_buffer_get_current (b0); if (sixrd_get_addr_net (t0, inner_ip60->src_address.as_u64[0]) != ip40->src_address.as_u32) { next0 = IPIP_INPUT_NEXT_DROP; b0->error = node->errors[IPIP_ERROR_NO_TUNNEL]; goto drop; } } vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, tunnel_sw_if_index, 1 /* packets */ , len /* bytes */ ); drop: if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { ipip_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_id = tunnel_sw_if_index; if (is_ipv6) { tr->length = ip60->payload_length; tr->src.ip6.as_u64[0] = ip60->src_address.as_u64[0]; tr->src.ip6.as_u64[1] = ip60->src_address.as_u64[1]; tr->dst.ip6.as_u64[0] = ip60->dst_address.as_u64[0]; tr->dst.ip6.as_u64[1] = ip60->dst_address.as_u64[1]; } else { tr->length = ip40->length; tr->src.ip4.as_u32 = ip40->src_address.as_u32; tr->dst.ip4.as_u32 = ip40->dst_address.as_u32; } } 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, !is_ipv6 ? ipip4_input_node.index : ipip6_input_node.index, IPIP_ERROR_DECAP_PKTS, from_frame->n_vectors); return from_frame->n_vectors; } VLIB_NODE_FN (ipip4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return ipip_input (vm, node, from_frame, /* is_ip6 */ false); } VLIB_NODE_FN (ipip6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return ipip_input (vm, node, from_frame, /* is_ip6 */ true); } static char *ipip_error_strings[] = { #define _(sym,string) string, foreach_ipip_error #undef _ }; /* *INDENT-OFF* */ VLIB_REGISTER_NODE(ipip4_input_node) = { .name = "ipip4-input", /* Takes a vector of packets. */ .vector_size = sizeof(u32), .n_errors = IPIP_N_ERROR, .error_strings = ipip_error_strings, .n_next_nodes = IPIP_INPUT_N_NEXT, .next_nodes = { #define _(s, n) [IPIP_INPUT_NEXT_##s] = n, foreach_ipip_input_next #undef _ }, .format_trace = format_ipip_rx_trace, }; VLIB_REGISTER_NODE(ipip6_input_node) = { .name = "ipip6-input", /* Takes a vector of packets. */ .vector_size = sizeof(u32), .n_errors = IPIP_N_ERROR, .error_strings = ipip_error_strings, .n_next_nodes = IPIP_INPUT_N_NEXT, .next_nodes = { #define _(s, n) [IPIP_INPUT_NEXT_##s] = n, foreach_ipip_input_next #undef _ }, .format_trace = format_ipip_rx_trace, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */