/* * decap.c: vxlan tunnel decap packet processing * * Copyright (c) 2013 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <vlib/vlib.h> #include <vnet/pg/pg.h> #include <vnet/vxlan/vxlan.h> #ifndef CLIB_MARCH_VARIANT vlib_node_registration_t vxlan4_input_node; vlib_node_registration_t vxlan6_input_node; #endif typedef struct { u32 next_index; u32 tunnel_index; u32 error; u32 vni; } vxlan_rx_trace_t; static u8 * format_vxlan_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 *); vxlan_rx_trace_t *t = va_arg (*args, vxlan_rx_trace_t *); if (t->tunnel_index == ~0) return format (s, "VXLAN decap error - tunnel for vni %d does not exist", t->vni); return format (s, "VXLAN decap from vxlan_tunnel%d vni %d next %d error %d", t->tunnel_index, t->vni, t->next_index, t->error); } typedef vxlan4_tunnel_key_t last_tunnel_cache4; static const vxlan_decap_info_t decap_not_found = { .sw_if_index = ~0, .next_index = VXLAN_INPUT_NEXT_DROP, .error = VXLAN_ERROR_NO_SUCH_TUNNEL }; static const vxlan_decap_info_t decap_bad_flags = { .sw_if_index = ~0, .next_index = VXLAN_INPUT_NEXT_DROP, .error = VXLAN_ERROR_BAD_FLAGS }; always_inline vxlan_decap_info_t vxlan4_find_tunnel (vxlan_main_t * vxm, last_tunnel_cache4 * cache, u32 fib_index, ip4_header_t * ip4_0, vxlan_header_t * vxlan0, u32 * stats_sw_if_index) { if (PREDICT_FALSE (vxlan0->flags != VXLAN_FLAGS_I)) return decap_bad_flags; /* Make sure VXLAN tunnel exist according to packet S/D IP, VRF, and VNI */ u32 dst = ip4_0->dst_address.as_u32; u32 src = ip4_0->src_address.as_u32; vxlan4_tunnel_key_t key4 = { .key[0] = ((u64) dst << 32) | src, .key[1] = ((u64) fib_index << 32) | vxlan0->vni_reserved, }; if (PREDICT_TRUE (key4.key[0] == cache->key[0] && key4.key[1] == cache->key[1])) { /* cache hit */ vxlan_decap_info_t di = {.as_u64 = cache->value }; *stats_sw_if_index = di.sw_if_index; return di; } int rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4); if (PREDICT_TRUE (rv == 0)) { *cache = key4; vxlan_decap_info_t di = {.as_u64 = key4.value }; *stats_sw_if_index = di.sw_if_index; return di; } /* try multicast */ if (PREDICT_TRUE (!ip4_address_is_multicast (&ip4_0->dst_address))) return decap_not_found; /* search for mcast decap info by mcast address */ key4.key[0] = dst; rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4); if (rv != 0) return decap_not_found; /* search for unicast tunnel using the mcast tunnel local(src) ip */ vxlan_decap_info_t mdi = {.as_u64 = key4.value }; key4.key[0] = ((u64) mdi.local_ip.as_u32 << 32) | src; rv = clib_bihash_search_inline_16_8 (&vxm->vxlan4_tunnel_by_key, &key4); if (PREDICT_FALSE (rv != 0)) return decap_not_found; /* mcast traffic does not update the cache */ *stats_sw_if_index = mdi.sw_if_index; vxlan_decap_info_t di = {.as_u64 = key4.value }; return di; } typedef vxlan6_tunnel_key_t last_tunnel_cache6; always_inline vxlan_decap_info_t vxlan6_find_tunnel (vxlan_main_t * vxm, last_tunnel_cache6 * cache, u32 fib_index, ip6_header_t * ip6_0, vxlan_header_t * vxlan0, u32 * stats_sw_if_index) { if (PREDICT_FALSE (vxlan0->flags != VXLAN_FLAGS_I)) return decap_bad_flags; /* Make sure VXLAN tunnel exist according to packet SIP and VNI */ vxlan6_tunnel_key_t key6 = { .key[0] = ip6_0->src_address.as_u64[0], .key[1] = ip6_0->src_address.as_u64[1], .key[2] = (((u64) fib_index) << 32) | vxlan0->vni_reserved, }; if (PREDICT_FALSE (clib_bihash_key_compare_24_8 (key6.key, cache->key) == 0)) { int rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6); if (PREDICT_FALSE (rv != 0)) return decap_not_found; *cache = key6; } vxlan_tunnel_t *t0 = pool_elt_at_index (vxm->tunnels, cache->value); /* Validate VXLAN tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6))) *stats_sw_if_index = t0->sw_if_index; else { /* try multicast */ if (PREDICT_TRUE (!ip6_address_is_multicast (&ip6_0->dst_address))) return decap_not_found; /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */ key6.key[0] = ip6_0->dst_address.as_u64[0]; key6.key[1] = ip6_0->dst_address.as_u64[1]; int rv = clib_bihash_search_inline_24_8 (&vxm->vxlan6_tunnel_by_key, &key6); if (PREDICT_FALSE (rv != 0)) return decap_not_found; vxlan_tunnel_t *mcast_t0 = pool_elt_at_index (vxm->tunnels, key6.value); *stats_sw_if_index = mcast_t0->sw_if_index; } vxlan_decap_info_t di = { .sw_if_index = t0->sw_if_index, .next_index = t0->decap_next_index, }; return di; } always_inline uword vxlan_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, u32 is_ip4) { vxlan_main_t *vxm = &vxlan_main; vnet_main_t *vnm = vxm->vnet_main; vnet_interface_main_t *im = &vnm->interface_main; vlib_combined_counter_main_t *rx_counter = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX; last_tunnel_cache4 last4; last_tunnel_cache6 last6; u32 pkts_dropped = 0; u32 thread_index = vlib_get_thread_index (); if (is_ip4) clib_memset (&last4, 0xff, sizeof last4); else clib_memset (&last6, 0xff, sizeof last6); u32 *from = vlib_frame_vector_args (from_frame); u32 n_left_from = from_frame->n_vectors; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; vlib_get_buffers (vm, from, bufs, n_left_from); u32 stats_if0 = ~0, stats_if1 = ~0; u16 nexts[VLIB_FRAME_SIZE], *next = nexts; while (n_left_from >= 4) { /* Prefetch next iteration. */ vlib_prefetch_buffer_header (b[2], LOAD); vlib_prefetch_buffer_header (b[3], LOAD); /* udp leaves current_data pointing at the vxlan header */ void *cur0 = vlib_buffer_get_current (b[0]); void *cur1 = vlib_buffer_get_current (b[1]); vxlan_header_t *vxlan0 = cur0; vxlan_header_t *vxlan1 = cur1; ip4_header_t *ip4_0, *ip4_1; ip6_header_t *ip6_0, *ip6_1; if (is_ip4) { ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t); ip4_1 = cur1 - sizeof (udp_header_t) - sizeof (ip4_header_t); } else { ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t); ip6_1 = cur1 - sizeof (udp_header_t) - sizeof (ip6_header_t); } /* pop vxlan */ vlib_buffer_advance (b[0], sizeof *vxlan0); vlib_buffer_advance (b[1], sizeof *vxlan1); u32 fi0 = vlib_buffer_get_ip_fib_index (b[0], is_ip4); u32 fi1 = vlib_buffer_get_ip_fib_index (b[1], is_ip4); vxlan_decap_info_t di0 = is_ip4 ? vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0, &stats_if0) : vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0, &stats_if0); vxlan_decap_info_t di1 = is_ip4 ? vxlan4_find_tunnel (vxm, &last4, fi1, ip4_1, vxlan1, &stats_if1) : vxlan6_find_tunnel (vxm, &last6, fi1, ip6_1, vxlan1, &stats_if1); /* Prefetch next iteration. */ CLIB_PREFETCH (b[2]->data, CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (b[3]->data, CLIB_CACHE_LINE_BYTES, LOAD); u32 len0 = vlib_buffer_length_in_chain (vm, b[0]); u32 len1 = vlib_buffer_length_in_chain (vm, b[1]); next[0] = di0.next_index; next[1] = di1.next_index; u8 any_error = di0.error | di1.error; if (PREDICT_TRUE (any_error == 0)) { /* Required to make the l2 tag push / pop code work on l2 subifs */ vnet_update_l2_len (b[0]); vnet_update_l2_len (b[1]); /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */ vnet_buffer (b[0])->sw_if_index[VLIB_RX] = di0.sw_if_index; vnet_buffer (b[1])->sw_if_index[VLIB_RX] = di1.sw_if_index; vlib_increment_combined_counter (rx_counter, thread_index, stats_if0, 1, len0); vlib_increment_combined_counter (rx_counter, thread_index, stats_if1, 1, len1); } else { if (di0.error == 0) { vnet_update_l2_len (b[0]); vnet_buffer (b[0])->sw_if_index[VLIB_RX] = di0.sw_if_index; vlib_increment_combined_counter (rx_counter, thread_index, stats_if0, 1, len0); } else { b[0]->error = node->errors[di0.error]; pkts_dropped++; } if (di1.error == 0) { vnet_update_l2_len (b[1]); vnet_buffer (b[1])->sw_if_index[VLIB_RX] = di1.sw_if_index; vlib_increment_combined_counter (rx_counter, thread_index, stats_if1, 1, len1); } else { b[1]->error = node->errors[di1.error]; pkts_dropped++; } } if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b[0], sizeof (*tr)); tr->next_index = next[0]; tr->error = di0.error; tr->tunnel_index = di0.sw_if_index == ~0 ? ~0 : vxm->tunnel_index_by_sw_if_index[di0.sw_if_index]; tr->vni = vnet_get_vni (vxlan0); } if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b[1], sizeof (*tr)); tr->next_index = next[1]; tr->error = di1.error; tr->tunnel_index = di1.sw_if_index == ~0 ? ~0 : vxm->tunnel_index_by_sw_if_index[di1.sw_if_index]; tr->vni = vnet_get_vni (vxlan1); } b += 2; next += 2; n_left_from -= 2; } while (n_left_from > 0) { /* udp leaves current_data pointing at the vxlan header */ void *cur0 = vlib_buffer_get_current (b[0]); vxlan_header_t *vxlan0 = cur0; ip4_header_t *ip4_0; ip6_header_t *ip6_0; if (is_ip4) ip4_0 = cur0 - sizeof (udp_header_t) - sizeof (ip4_header_t); else ip6_0 = cur0 - sizeof (udp_header_t) - sizeof (ip6_header_t); /* pop (ip, udp, vxlan) */ vlib_buffer_advance (b[0], sizeof (*vxlan0)); u32 fi0 = vlib_buffer_get_ip_fib_index (b[0], is_ip4); vxlan_decap_info_t di0 = is_ip4 ? vxlan4_find_tunnel (vxm, &last4, fi0, ip4_0, vxlan0, &stats_if0) : vxlan6_find_tunnel (vxm, &last6, fi0, ip6_0, vxlan0, &stats_if0); uword len0 = vlib_buffer_length_in_chain (vm, b[0]); next[0] = di0.next_index; /* Validate VXLAN tunnel encap-fib index against packet */ if (di0.error == 0) { /* Required to make the l2 tag push / pop code work on l2 subifs */ vnet_update_l2_len (b[0]); /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */ vnet_buffer (b[0])->sw_if_index[VLIB_RX] = di0.sw_if_index; vlib_increment_combined_counter (rx_counter, thread_index, stats_if0, 1, len0); } else { b[0]->error = node->errors[di0.error]; pkts_dropped++; } if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b[0], sizeof (*tr)); tr->next_index = next[0]; tr->error = di0.error; tr->tunnel_index = di0.sw_if_index == ~0 ? ~0 : vxm->tunnel_index_by_sw_if_index[di0.sw_if_index]; tr->vni = vnet_get_vni (vxlan0); } b += 1; next += 1; n_left_from -= 1; } vlib_buffer_enqueue_to_next (vm, node, from, nexts, from_frame->n_vectors); /* Do we still need this now that tunnel tx stats is kept? */ u32 node_idx = is_ip4 ? vxlan4_input_node.index : vxlan6_input_node.index; vlib_node_increment_counter (vm, node_idx, VXLAN_ERROR_DECAPSULATED, from_frame->n_vectors - pkts_dropped); return from_frame->n_vectors; } VLIB_NODE_FN (vxlan4_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return vxlan_input (vm, node, from_frame, /* is_ip4 */ 1); } VLIB_NODE_FN (vxlan6_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return vxlan_input (vm, node, from_frame, /* is_ip4 */ 0); } static char *vxlan_error_strings[] = { #define vxlan_error(n,s) s, #include <vnet/vxlan/vxlan_error.def> #undef vxlan_error }; /* *INDENT-OFF* */ VLIB_REGISTER_NODE (vxlan4_input_node) = { .name = "vxlan4-input", .vector_size = sizeof (u32), .n_errors = VXLAN_N_ERROR, .error_strings = vxlan_error_strings, .n_next_nodes = VXLAN_INPUT_N_NEXT, .format_trace = format_vxlan_rx_trace, .next_nodes = { #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n, foreach_vxlan_input_next #undef _ }, }; VLIB_REGISTER_NODE (vxlan6_input_node) = { .name = "vxlan6-input", .vector_size = sizeof (u32), .n_errors = VXLAN_N_ERROR, .error_strings = vxlan_error_strings, .n_next_nodes = VXLAN_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n, foreach_vxlan_input_next #undef _ }, .format_trace = format_vxlan_rx_trace, }; /* *INDENT-ON* */ typedef enum { IP_VXLAN_BYPASS_NEXT_DROP, IP_VXLAN_BYPASS_NEXT_VXLAN, IP_VXLAN_BYPASS_N_NEXT, } ip_vxlan_bypass_next_t; always_inline uword ip_vxlan_bypass_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, u32 is_ip4) { vxlan_main_t *vxm = &vxlan_main; u32 *from, *to_next, n_left_from, n_left_to_next, next_index; vlib_node_runtime_t *error_node = vlib_node_get_runtime (vm, ip4_input_node.index); vtep4_key_t last_vtep4; /* last IPv4 address / fib index matching a local VTEP address */ vtep6_key_t last_vtep6; /* last IPv6 address / fib index matching a local VTEP address */ from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; if (node->flags & VLIB_NODE_FLAG_TRACE) ip4_forward_next_trace (vm, node, frame, VLIB_TX); if (is_ip4) vtep4_key_init (&last_vtep4); else vtep6_key_init (&last_vtep6); while (n_left_from > 0) { vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { vlib_buffer_t *b0, *b1; ip4_header_t *ip40, *ip41; ip6_header_t *ip60, *ip61; udp_header_t *udp0, *udp1; u32 bi0, ip_len0, udp_len0, flags0, next0; u32 bi1, ip_len1, udp_len1, flags1, next1; i32 len_diff0, len_diff1; u8 error0, good_udp0, proto0; u8 error1, good_udp1, proto1; /* 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, 2 * CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD); } bi0 = to_next[0] = from[0]; bi1 = to_next[1] = from[1]; from += 2; n_left_from -= 2; to_next += 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); if (is_ip4) { ip40 = vlib_buffer_get_current (b0); ip41 = vlib_buffer_get_current (b1); } else { ip60 = vlib_buffer_get_current (b0); ip61 = vlib_buffer_get_current (b1); } /* Setup packet for next IP feature */ vnet_feature_next (&next0, b0); vnet_feature_next (&next1, b1); if (is_ip4) { /* Treat IP frag packets as "experimental" protocol for now until support of IP frag reassembly is implemented */ proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol; proto1 = ip4_is_fragment (ip41) ? 0xfe : ip41->protocol; } else { proto0 = ip60->protocol; proto1 = ip61->protocol; } /* Process packet 0 */ if (proto0 != IP_PROTOCOL_UDP) goto exit0; /* not UDP packet */ if (is_ip4) udp0 = ip4_next_header (ip40); else udp0 = ip6_next_header (ip60); if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan)) goto exit0; /* not VXLAN packet */ /* Validate DIP against VTEPs */ if (is_ip4) { if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4)) goto exit0; /* no local VTEP for VXLAN packet */ } else { if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6)) goto exit0; /* no local VTEP for VXLAN packet */ } flags0 = b0->flags; good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp0 |= udp0->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len0 = clib_net_to_host_u16 (ip40->length); else ip_len0 = clib_net_to_host_u16 (ip60->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp0)) { if (is_ip4) flags0 = ip4_tcp_udp_validate_checksum (vm, b0); else flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0); good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } if (is_ip4) { error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH; } else { error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH; } next0 = error0 ? IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN; b0->error = error0 ? error_node->errors[error0] : 0; /* vxlan-input node expect current at VXLAN header */ if (is_ip4) vlib_buffer_advance (b0, sizeof (ip4_header_t) + sizeof (udp_header_t)); else vlib_buffer_advance (b0, sizeof (ip6_header_t) + sizeof (udp_header_t)); exit0: /* Process packet 1 */ if (proto1 != IP_PROTOCOL_UDP) goto exit1; /* not UDP packet */ if (is_ip4) udp1 = ip4_next_header (ip41); else udp1 = ip6_next_header (ip61); if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan)) goto exit1; /* not VXLAN packet */ /* Validate DIP against VTEPs */ if (is_ip4) { if (!vtep4_check (&vxm->vtep_table, b1, ip41, &last_vtep4)) goto exit1; /* no local VTEP for VXLAN packet */ } else { if (!vtep6_check (&vxm->vtep_table, b1, ip61, &last_vtep6)) goto exit1; /* no local VTEP for VXLAN packet */ } flags1 = b1->flags; good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp1 |= udp1->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len1 = clib_net_to_host_u16 (ip41->length); else ip_len1 = clib_net_to_host_u16 (ip61->payload_length); udp_len1 = clib_net_to_host_u16 (udp1->length); len_diff1 = ip_len1 - udp_len1; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp1)) { if (is_ip4) flags1 = ip4_tcp_udp_validate_checksum (vm, b1); else flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1); good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } if (is_ip4) { error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM; error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH; } else { error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM; error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH; } next1 = error1 ? IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN; b1->error = error1 ? error_node->errors[error1] : 0; /* vxlan-input node expect current at VXLAN header */ if (is_ip4) vlib_buffer_advance (b1, sizeof (ip4_header_t) + sizeof (udp_header_t)); else vlib_buffer_advance (b1, sizeof (ip6_header_t) + sizeof (udp_header_t)); exit1: 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) { vlib_buffer_t *b0; ip4_header_t *ip40; ip6_header_t *ip60; udp_header_t *udp0; u32 bi0, ip_len0, udp_len0, flags0, next0; i32 len_diff0; u8 error0, good_udp0, proto0; 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_ip4) ip40 = vlib_buffer_get_current (b0); else ip60 = vlib_buffer_get_current (b0); /* Setup packet for next IP feature */ vnet_feature_next (&next0, b0); if (is_ip4) /* Treat IP4 frag packets as "experimental" protocol for now until support of IP frag reassembly is implemented */ proto0 = ip4_is_fragment (ip40) ? 0xfe : ip40->protocol; else proto0 = ip60->protocol; if (proto0 != IP_PROTOCOL_UDP) goto exit; /* not UDP packet */ if (is_ip4) udp0 = ip4_next_header (ip40); else udp0 = ip6_next_header (ip60); if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_vxlan)) goto exit; /* not VXLAN packet */ /* Validate DIP against VTEPs */ if (is_ip4) { if (!vtep4_check (&vxm->vtep_table, b0, ip40, &last_vtep4)) goto exit; /* no local VTEP for VXLAN packet */ } else { if (!vtep6_check (&vxm->vtep_table, b0, ip60, &last_vtep6)) goto exit; /* no local VTEP for VXLAN packet */ } flags0 = b0->flags; good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp0 |= udp0->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len0 = clib_net_to_host_u16 (ip40->length); else ip_len0 = clib_net_to_host_u16 (ip60->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp0)) { if (is_ip4) flags0 = ip4_tcp_udp_validate_checksum (vm, b0); else flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0); good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } if (is_ip4) { error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH; } else { error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH; } next0 = error0 ? IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN; b0->error = error0 ? error_node->errors[error0] : 0; /* vxlan-input node expect current at VXLAN header */ if (is_ip4) vlib_buffer_advance (b0, sizeof (ip4_header_t) + sizeof (udp_header_t)); else vlib_buffer_advance (b0, sizeof (ip6_header_t) + sizeof (udp_header_t)); exit: 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); } return frame->n_vectors; } VLIB_NODE_FN (ip4_vxlan_bypass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip4_vxlan_bypass_node) = { .name = "ip4-vxlan-bypass", .vector_size = sizeof (u32), .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT, .next_nodes = { [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop", [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-input", }, .format_buffer = format_ip4_header, .format_trace = format_ip4_forward_next_trace, }; /* *INDENT-ON* */ /* Dummy init function to get us linked in. */ static clib_error_t * ip4_vxlan_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip4_vxlan_bypass_init); VLIB_NODE_FN (ip6_vxlan_bypass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_vxlan_bypass_node) = { .name = "ip6-vxlan-bypass", .vector_size = sizeof (u32), .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT, .next_nodes = { [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop", [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-input", }, .format_buffer = format_ip6_header, .format_trace = format_ip6_forward_next_trace, }; /* *INDENT-ON* */ /* Dummy init function to get us linked in. */ static clib_error_t * ip6_vxlan_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip6_vxlan_bypass_init); #define foreach_vxlan_flow_input_next \ _(DROP, "error-drop") \ _(L2_INPUT, "l2-input") typedef enum { #define _(s,n) VXLAN_FLOW_NEXT_##s, foreach_vxlan_flow_input_next #undef _ VXLAN_FLOW_N_NEXT, } vxlan_flow_input_next_t; #define foreach_vxlan_flow_error \ _(NONE, "no error") \ _(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \ _(IP_HEADER_ERROR, "Rx ip header errors") \ _(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \ _(UDP_LENGTH_ERROR, "Rx udp length errors") typedef enum { #define _(f,s) VXLAN_FLOW_ERROR_##f, foreach_vxlan_flow_error #undef _ VXLAN_FLOW_N_ERROR, } vxlan_flow_error_t; static char *vxlan_flow_error_strings[] = { #define _(n,s) s, foreach_vxlan_flow_error #undef _ }; static_always_inline u8 vxlan_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t * b) { u32 flags = b->flags; enum { offset = sizeof (ip4_header_t) + sizeof (udp_header_t) + sizeof (vxlan_header_t), }; /* Verify UDP checksum */ if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { vlib_buffer_advance (b, -offset); flags = ip4_tcp_udp_validate_checksum (vm, b); vlib_buffer_advance (b, offset); } return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } static_always_inline u8 vxlan_check_udp_csum (vlib_main_t * vm, vlib_buffer_t * b) { ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr; udp_header_t *udp = &hdr->udp; /* Don't verify UDP checksum for packets with explicit zero checksum. */ u8 good_csum = (b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0 || udp->checksum == 0; return !good_csum; } static_always_inline u8 vxlan_check_ip (vlib_buffer_t * b, u16 payload_len) { ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr; u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length); u16 expected = payload_len + sizeof *hdr; return ip_len > expected || hdr->ip4.ttl == 0 || hdr->ip4.ip_version_and_header_length != 0x45; } static_always_inline u8 vxlan_check_ip_udp_len (vlib_buffer_t * b) { ip4_vxlan_header_t *hdr = vlib_buffer_get_current (b) - sizeof *hdr; u16 ip_len = clib_net_to_host_u16 (hdr->ip4.length); u16 udp_len = clib_net_to_host_u16 (hdr->udp.length); return udp_len > ip_len; } static_always_inline u8 vxlan_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0) { u8 error0 = VXLAN_FLOW_ERROR_NONE; if (ip_err0) error0 = VXLAN_FLOW_ERROR_IP_HEADER_ERROR; if (udp_err0) error0 = VXLAN_FLOW_ERROR_UDP_LENGTH_ERROR; if (csum_err0) error0 = VXLAN_FLOW_ERROR_UDP_CHECKSUM_ERROR; return error0; } VLIB_NODE_FN (vxlan4_flow_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * f) { enum { payload_offset = sizeof (ip4_vxlan_header_t) }; vxlan_main_t *vxm = &vxlan_main; vnet_interface_main_t *im = &vnet_main.interface_main; vlib_combined_counter_main_t *rx_counter[VXLAN_FLOW_N_NEXT] = { [VXLAN_FLOW_NEXT_DROP] = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_DROP, [VXLAN_FLOW_NEXT_L2_INPUT] = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, }; u32 thread_index = vlib_get_thread_index (); u32 *from = vlib_frame_vector_args (f); u32 n_left_from = f->n_vectors; u32 next_index = VXLAN_FLOW_NEXT_L2_INPUT; while (n_left_from > 0) { u32 n_left_to_next, *to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 3 && n_left_to_next > 3) { u32 bi0 = to_next[0] = from[0]; u32 bi1 = to_next[1] = from[1]; u32 bi2 = to_next[2] = from[2]; u32 bi3 = to_next[3] = from[3]; from += 4; n_left_from -= 4; to_next += 4; n_left_to_next -= 4; vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); vlib_buffer_t *b1 = vlib_get_buffer (vm, bi1); vlib_buffer_t *b2 = vlib_get_buffer (vm, bi2); vlib_buffer_t *b3 = vlib_get_buffer (vm, bi3); vlib_buffer_advance (b0, payload_offset); vlib_buffer_advance (b1, payload_offset); vlib_buffer_advance (b2, payload_offset); vlib_buffer_advance (b3, payload_offset); u16 len0 = vlib_buffer_length_in_chain (vm, b0); u16 len1 = vlib_buffer_length_in_chain (vm, b1); u16 len2 = vlib_buffer_length_in_chain (vm, b2); u16 len3 = vlib_buffer_length_in_chain (vm, b3); u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT, next1 = VXLAN_FLOW_NEXT_L2_INPUT, next2 = VXLAN_FLOW_NEXT_L2_INPUT, next3 = VXLAN_FLOW_NEXT_L2_INPUT; u8 ip_err0 = vxlan_check_ip (b0, len0); u8 ip_err1 = vxlan_check_ip (b1, len1); u8 ip_err2 = vxlan_check_ip (b2, len2); u8 ip_err3 = vxlan_check_ip (b3, len3); u8 ip_err = ip_err0 | ip_err1 | ip_err2 | ip_err3; u8 udp_err0 = vxlan_check_ip_udp_len (b0); u8 udp_err1 = vxlan_check_ip_udp_len (b1); u8 udp_err2 = vxlan_check_ip_udp_len (b2); u8 udp_err3 = vxlan_check_ip_udp_len (b3); u8 udp_err = udp_err0 | udp_err1 | udp_err2 | udp_err3; u8 csum_err0 = vxlan_check_udp_csum (vm, b0); u8 csum_err1 = vxlan_check_udp_csum (vm, b1); u8 csum_err2 = vxlan_check_udp_csum (vm, b2); u8 csum_err3 = vxlan_check_udp_csum (vm, b3); u8 csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3; if (PREDICT_FALSE (csum_err)) { if (csum_err0) csum_err0 = !vxlan_validate_udp_csum (vm, b0); if (csum_err1) csum_err1 = !vxlan_validate_udp_csum (vm, b1); if (csum_err2) csum_err2 = !vxlan_validate_udp_csum (vm, b2); if (csum_err3) csum_err3 = !vxlan_validate_udp_csum (vm, b3); csum_err = csum_err0 | csum_err1 | csum_err2 | csum_err3; } if (PREDICT_FALSE (ip_err || udp_err || csum_err)) { if (ip_err0 || udp_err0 || csum_err0) { next0 = VXLAN_FLOW_NEXT_DROP; u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0); b0->error = node->errors[error0]; } if (ip_err1 || udp_err1 || csum_err1) { next1 = VXLAN_FLOW_NEXT_DROP; u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1); b1->error = node->errors[error1]; } if (ip_err2 || udp_err2 || csum_err2) { next2 = VXLAN_FLOW_NEXT_DROP; u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2); b2->error = node->errors[error2]; } if (ip_err3 || udp_err3 || csum_err3) { next3 = VXLAN_FLOW_NEXT_DROP; u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3); b3->error = node->errors[error3]; } } vnet_update_l2_len (b0); vnet_update_l2_len (b1); vnet_update_l2_len (b2); vnet_update_l2_len (b3); ASSERT (b0->flow_id != 0); ASSERT (b1->flow_id != 0); ASSERT (b2->flow_id != 0); ASSERT (b3->flow_id != 0); u32 t_index0 = b0->flow_id - vxm->flow_id_start; u32 t_index1 = b1->flow_id - vxm->flow_id_start; u32 t_index2 = b2->flow_id - vxm->flow_id_start; u32 t_index3 = b3->flow_id - vxm->flow_id_start; vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0]; vxlan_tunnel_t *t1 = &vxm->tunnels[t_index1]; vxlan_tunnel_t *t2 = &vxm->tunnels[t_index2]; vxlan_tunnel_t *t3 = &vxm->tunnels[t_index3]; /* flow id consumed */ b0->flow_id = 0; b1->flow_id = 0; b2->flow_id = 0; b3->flow_id = 0; u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index; u32 sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX] = t1->sw_if_index; u32 sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_RX] = t2->sw_if_index; u32 sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_RX] = t3->sw_if_index; vlib_increment_combined_counter (rx_counter[next0], thread_index, sw_if_index0, 1, len0); vlib_increment_combined_counter (rx_counter[next1], thread_index, sw_if_index1, 1, len1); vlib_increment_combined_counter (rx_counter[next2], thread_index, sw_if_index2, 1, len2); vlib_increment_combined_counter (rx_counter[next3], thread_index, sw_if_index3, 1, len3); u32 flags = b0->flags | b1->flags | b2->flags | b3->flags; if (PREDICT_FALSE (flags & VLIB_BUFFER_IS_TRACED)) { if (b0->flags & VLIB_BUFFER_IS_TRACED) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof *tr); u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0); tr->next_index = next0; tr->error = error0; tr->tunnel_index = t_index0; tr->vni = t0->vni; } if (b1->flags & VLIB_BUFFER_IS_TRACED) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof *tr); u8 error1 = vxlan_err_code (ip_err1, udp_err1, csum_err1); tr->next_index = next1; tr->error = error1; tr->tunnel_index = t_index1; tr->vni = t1->vni; } if (b2->flags & VLIB_BUFFER_IS_TRACED) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b2, sizeof *tr); u8 error2 = vxlan_err_code (ip_err2, udp_err2, csum_err2); tr->next_index = next2; tr->error = error2; tr->tunnel_index = t_index2; tr->vni = t2->vni; } if (b3->flags & VLIB_BUFFER_IS_TRACED) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b3, sizeof *tr); u8 error3 = vxlan_err_code (ip_err3, udp_err3, csum_err3); tr->next_index = next3; tr->error = error3; tr->tunnel_index = t_index3; tr->vni = t3->vni; } } vlib_validate_buffer_enqueue_x4 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, bi2, bi3, next0, next1, next2, next3); } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0 = to_next[0] = from[0]; from++; n_left_from--; to_next++; n_left_to_next--; vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); vlib_buffer_advance (b0, payload_offset); u16 len0 = vlib_buffer_length_in_chain (vm, b0); u32 next0 = VXLAN_FLOW_NEXT_L2_INPUT; u8 ip_err0 = vxlan_check_ip (b0, len0); u8 udp_err0 = vxlan_check_ip_udp_len (b0); u8 csum_err0 = vxlan_check_udp_csum (vm, b0); if (csum_err0) csum_err0 = !vxlan_validate_udp_csum (vm, b0); if (ip_err0 || udp_err0 || csum_err0) { next0 = VXLAN_FLOW_NEXT_DROP; u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0); b0->error = node->errors[error0]; } vnet_update_l2_len (b0); ASSERT (b0->flow_id != 0); u32 t_index0 = b0->flow_id - vxm->flow_id_start; vxlan_tunnel_t *t0 = &vxm->tunnels[t_index0]; b0->flow_id = 0; u32 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX] = t0->sw_if_index; vlib_increment_combined_counter (rx_counter[next0], thread_index, sw_if_index0, 1, len0); if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof *tr); u8 error0 = vxlan_err_code (ip_err0, udp_err0, csum_err0); tr->next_index = next0; tr->error = error0; tr->tunnel_index = t_index0; tr->vni = t0->vni; } 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); } return f->n_vectors; } /* *INDENT-OFF* */ #ifndef CLIB_MULTIARCH_VARIANT VLIB_REGISTER_NODE (vxlan4_flow_input_node) = { .name = "vxlan-flow-input", .type = VLIB_NODE_TYPE_INTERNAL, .vector_size = sizeof (u32), .format_trace = format_vxlan_rx_trace, .n_errors = VXLAN_FLOW_N_ERROR, .error_strings = vxlan_flow_error_strings, .n_next_nodes = VXLAN_FLOW_N_NEXT, .next_nodes = { #define _(s,n) [VXLAN_FLOW_NEXT_##s] = n, foreach_vxlan_flow_input_next #undef _ }, }; #endif /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */