/* * 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> vlib_node_registration_t vxlan4_input_node; vlib_node_registration_t vxlan6_input_node; 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) { s = format (s, "VXLAN decap from vxlan_tunnel%d vni %d next %d error %d", t->tunnel_index, t->vni, t->next_index, t->error); } else { s = format (s, "VXLAN decap error - tunnel for vni %d does not exist", t->vni); } return s; } always_inline u32 validate_vxlan_fib (vlib_buffer_t *b, vxlan_tunnel_t *t, u32 is_ip4) { u32 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX]; u32 * fib_index_by_sw_if_index = is_ip4 ? ip4_main.fib_index_by_sw_if_index : ip6_main.fib_index_by_sw_if_index; u32 tx_sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX]; u32 fib_index = (tx_sw_if_index == (u32) ~ 0) ? vec_elt (fib_index_by_sw_if_index, sw_if_index) : tx_sw_if_index; return (fib_index == t->encap_fib_index); } 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; u32 last_tunnel_index = ~0; vxlan4_tunnel_key_t last_key4; vxlan6_tunnel_key_t last_key6; u32 pkts_decapsulated = 0; u32 thread_index = vlib_get_thread_index(); if (is_ip4) last_key4.as_u64 = ~0; else memset (&last_key6, 0xff, sizeof (last_key6)); u32 next_index = node->cached_next_index; u32 stats_sw_if_index = node->runtime_data[0]; u32 stats_n_packets = 0, stats_n_bytes = 0; u32 * from = vlib_frame_vector_args (from_frame); u32 n_left_from = from_frame->n_vectors; while (n_left_from > 0) { u32 * to_next, n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t * b0, * b1; u32 next0, next1; vxlan_tunnel_t * t0, * t1, * stats_t0, * stats_t1; /* 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 = from[0]; bi1 = from[1]; to_next[0] = bi0; to_next[1] = bi1; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); /* udp leaves current_data pointing at the vxlan header */ void * cur0 = vlib_buffer_get_current (b0); void * cur1 = vlib_buffer_get_current (b1); 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 (ip, udp, vxlan) */ vlib_buffer_advance (b0, sizeof *vxlan0); vlib_buffer_advance (b1, sizeof *vxlan1); u32 tunnel_index0 = ~0, tunnel_index1 = ~0; u32 error0 = 0, error1 = 0; if (PREDICT_FALSE (vxlan0->flags != VXLAN_FLAGS_I)) { error0 = VXLAN_ERROR_BAD_FLAGS; next0 = VXLAN_INPUT_NEXT_DROP; goto trace0; } if (is_ip4) { /* Make sure VXLAN tunnel exist according to packet SIP and VNI */ vxlan4_tunnel_key_t key4_0 = { .src = ip4_0->src_address.as_u32, .vni = vxlan0->vni_reserved, }; if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64)) { uword * p = hash_get (vxm->vxlan4_tunnel_by_key, key4_0.as_u64); if (PREDICT_FALSE (p == NULL)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace0; } last_key4 = key4_0; last_tunnel_index = p[0]; } tunnel_index0 = last_tunnel_index; stats_t0 = t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0); /* Validate VXLAN tunnel encap-fib index agaist packet */ if (PREDICT_FALSE (validate_vxlan_fib (b0, t0, is_ip4) == 0)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace0; } /* Validate VXLAN tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32)) goto next0; /* valid packet */ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_0->dst_address))) { key4_0.src = ip4_0->dst_address.as_u32; /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */ uword * p = hash_get (vxm->vxlan4_tunnel_by_key, key4_0.as_u64); if (PREDICT_TRUE (p != NULL)) { stats_t0 = pool_elt_at_index (vxm->tunnels, p[0]); goto next0; /* valid packet */ } } error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace0; } else /* !is_ip4 */ { /* Make sure VXLAN tunnel exist according to packet SIP and VNI */ vxlan6_tunnel_key_t key6_0 = { .src = ip6_0->src_address, .vni = vxlan0->vni_reserved, }; if (PREDICT_FALSE (memcmp(&key6_0, &last_key6, sizeof(last_key6)) != 0)) { uword * p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6_0); if (PREDICT_FALSE (p == NULL)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace0; } clib_memcpy (&last_key6, &key6_0, sizeof(key6_0)); last_tunnel_index = p[0]; } tunnel_index0 = last_tunnel_index; stats_t0 = t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0); /* Validate VXLAN tunnel encap-fib index agaist packet */ if (PREDICT_FALSE (validate_vxlan_fib (b0, t0, is_ip4) == 0)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace0; } /* Validate VXLAN tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6))) goto next0; /* valid packet */ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address))) { key6_0.src = ip6_0->dst_address; uword * p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6_0); if (PREDICT_TRUE (p != NULL)) { stats_t0 = pool_elt_at_index (vxm->tunnels, p[0]); goto next0; /* valid packet */ } } error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace0; } next0: next0 = t0->decap_next_index; u32 len0 = vlib_buffer_length_in_chain (vm, b0); /* Required to make the l2 tag push / pop code work on l2 subifs */ if (PREDICT_TRUE(next0 == VXLAN_INPUT_NEXT_L2_INPUT)) vnet_update_l2_len (b0); /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */ vnet_buffer(b0)->sw_if_index[VLIB_RX] = t0->sw_if_index; /* Batch stats increment on the same vxlan tunnel so counter is not incremented per packet */ u32 sw_if_index0 = stats_t0->sw_if_index; if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index)) { if (stats_n_packets) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); pkts_decapsulated += stats_n_packets; stats_n_packets = stats_n_bytes = 0; } stats_sw_if_index = sw_if_index0; } stats_n_packets += 1; stats_n_bytes += len0; trace0: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->tunnel_index = tunnel_index0; tr->vni = vnet_get_vni (vxlan0); } if (PREDICT_FALSE (vxlan1->flags != VXLAN_FLAGS_I)) { error1 = VXLAN_ERROR_BAD_FLAGS; next1 = VXLAN_INPUT_NEXT_DROP; goto trace1; } if (is_ip4) { /* Make sure VXLAN tunnel exist according to packet SIP and VNI */ vxlan4_tunnel_key_t key4_1 = { .src = ip4_1->src_address.as_u32, .vni = vxlan1->vni_reserved }; if (PREDICT_FALSE (key4_1.as_u64 != last_key4.as_u64)) { uword * p = hash_get (vxm->vxlan4_tunnel_by_key, key4_1.as_u64); if (PREDICT_FALSE (p == NULL)) { error1 = VXLAN_ERROR_NO_SUCH_TUNNEL; next1 = VXLAN_INPUT_NEXT_DROP; goto trace1; } last_key4 = key4_1; last_tunnel_index = p[0]; } tunnel_index1 = last_tunnel_index; stats_t1 = t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1); /* Validate VXLAN tunnel encap-fib index against packet */ if (PREDICT_FALSE (validate_vxlan_fib (b1, t1, is_ip4) == 0)) { error1 = VXLAN_ERROR_NO_SUCH_TUNNEL; next1 = VXLAN_INPUT_NEXT_DROP; goto trace1; } /* Validate VXLAN tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip4_1->dst_address.as_u32 == t1->src.ip4.as_u32)) goto next1; /* valid packet */ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_1->dst_address))) { /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */ key4_1.src = ip4_1->dst_address.as_u32; uword * p = hash_get (vxm->vxlan4_tunnel_by_key, key4_1.as_u64); if (PREDICT_TRUE (p != NULL)) { stats_t1 = pool_elt_at_index (vxm->tunnels, p[0]); goto next1; /* valid packet */ } } error1 = VXLAN_ERROR_NO_SUCH_TUNNEL; next1 = VXLAN_INPUT_NEXT_DROP; goto trace1; } else /* !is_ip4 */ { /* Make sure VXLAN tunnel exist according to packet SIP and VNI */ vxlan6_tunnel_key_t key6_1 = { .src = ip6_1->src_address, .vni = vxlan1->vni_reserved, }; if (PREDICT_FALSE (memcmp(&key6_1, &last_key6, sizeof(last_key6)) != 0)) { uword * p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6_1); if (PREDICT_FALSE (p == NULL)) { error1 = VXLAN_ERROR_NO_SUCH_TUNNEL; next1 = VXLAN_INPUT_NEXT_DROP; goto trace1; } clib_memcpy (&last_key6, &key6_1, sizeof(key6_1)); last_tunnel_index = p[0]; } tunnel_index1 = last_tunnel_index; stats_t1 = t1 = pool_elt_at_index (vxm->tunnels, tunnel_index1); /* Validate VXLAN tunnel encap-fib index agaist packet */ if (PREDICT_FALSE (validate_vxlan_fib (b1, t1, is_ip4) == 0)) { error1 = VXLAN_ERROR_NO_SUCH_TUNNEL; next1 = VXLAN_INPUT_NEXT_DROP; goto trace1; } /* Validate VXLAN tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_1->dst_address, &t1->src.ip6))) goto next1; /* valid packet */ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_1->dst_address))) { key6_1.src = ip6_1->dst_address; uword * p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6_1); if (PREDICT_TRUE (p != NULL)) { stats_t1 = pool_elt_at_index (vxm->tunnels, p[0]); goto next1; /* valid packet */ } } error1 = VXLAN_ERROR_NO_SUCH_TUNNEL; next1 = VXLAN_INPUT_NEXT_DROP; goto trace1; } next1: next1 = t1->decap_next_index; u32 len1 = vlib_buffer_length_in_chain (vm, b1); /* Required to make the l2 tag push / pop code work on l2 subifs */ if (PREDICT_TRUE(next1 == VXLAN_INPUT_NEXT_L2_INPUT)) vnet_update_l2_len (b1); /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */ vnet_buffer(b1)->sw_if_index[VLIB_RX] = t1->sw_if_index; /* Batch stats increment on the same vxlan tunnel so counter is not incremented per packet */ u32 sw_if_index1 = stats_t1->sw_if_index; if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index)) { if (stats_n_packets) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); pkts_decapsulated += stats_n_packets; stats_n_packets = stats_n_bytes = 0; } stats_sw_if_index = sw_if_index1; } stats_n_packets += 1; stats_n_bytes += len1; trace1: b1->error = error1 ? node->errors[error1] : 0; if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); tr->next_index = next1; tr->error = error1; tr->tunnel_index = tunnel_index1; tr->vni = vnet_get_vni (vxlan1); } 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; ip4_header_t * ip4_0; ip6_header_t * ip6_0; vxlan_tunnel_t * t0, * stats_t0; 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); /* udp leaves current_data pointing at the vxlan header */ void * cur0 = vlib_buffer_get_current (b0); vxlan_header_t * vxlan0 = cur0; 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 (b0, sizeof(*vxlan0)); u32 tunnel_index0 = ~0; u32 error0 = 0; if (PREDICT_FALSE (vxlan0->flags != VXLAN_FLAGS_I)) { error0 = VXLAN_ERROR_BAD_FLAGS; next0 = VXLAN_INPUT_NEXT_DROP; goto trace00; } if (is_ip4) { vxlan4_tunnel_key_t key4_0 = { .src = ip4_0->src_address.as_u32, .vni = vxlan0->vni_reserved, }; /* Make sure unicast VXLAN tunnel exist by packet SIP and VNI */ if (PREDICT_FALSE (key4_0.as_u64 != last_key4.as_u64)) { uword * p = hash_get (vxm->vxlan4_tunnel_by_key, key4_0.as_u64); if (PREDICT_FALSE (p == NULL)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace00; } last_key4 = key4_0; last_tunnel_index = p[0]; } tunnel_index0 = last_tunnel_index; stats_t0 = t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0); /* Validate VXLAN tunnel encap-fib index agaist packet */ if (PREDICT_FALSE (validate_vxlan_fib (b0, t0, is_ip4) == 0)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace00; } /* Validate VXLAN tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip4_0->dst_address.as_u32 == t0->src.ip4.as_u32)) goto next00; /* valid packet */ if (PREDICT_FALSE (ip4_address_is_multicast (&ip4_0->dst_address))) { /* Make sure mcast VXLAN tunnel exist by packet DIP and VNI */ key4_0.src = ip4_0->dst_address.as_u32; uword * p = hash_get (vxm->vxlan4_tunnel_by_key, key4_0.as_u64); if (PREDICT_TRUE (p != NULL)) { stats_t0 = pool_elt_at_index (vxm->tunnels, p[0]); goto next00; /* valid packet */ } } error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace00; } else /* !is_ip4 */ { /* Make sure VXLAN tunnel exist according to packet SIP and VNI */ vxlan6_tunnel_key_t key6_0 = { .src = ip6_0->src_address, .vni = vxlan0->vni_reserved, }; if (PREDICT_FALSE (memcmp(&key6_0, &last_key6, sizeof(last_key6)) != 0)) { uword * p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6_0); if (PREDICT_FALSE (p == NULL)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace00; } clib_memcpy (&last_key6, &key6_0, sizeof(key6_0)); last_tunnel_index = p[0]; } tunnel_index0 = last_tunnel_index; stats_t0 = t0 = pool_elt_at_index (vxm->tunnels, tunnel_index0); /* Validate VXLAN tunnel encap-fib index agaist packet */ if (PREDICT_FALSE (validate_vxlan_fib (b0, t0, is_ip4) == 0)) { error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace00; } /* Validate VXLAN tunnel SIP against packet DIP */ if (PREDICT_TRUE (ip6_address_is_equal (&ip6_0->dst_address, &t0->src.ip6))) goto next00; /* valid packet */ if (PREDICT_FALSE (ip6_address_is_multicast (&ip6_0->dst_address))) { key6_0.src = ip6_0->dst_address; uword * p = hash_get_mem (vxm->vxlan6_tunnel_by_key, &key6_0); if (PREDICT_TRUE (p != NULL)) { stats_t0 = pool_elt_at_index (vxm->tunnels, p[0]); goto next00; /* valid packet */ } } error0 = VXLAN_ERROR_NO_SUCH_TUNNEL; next0 = VXLAN_INPUT_NEXT_DROP; goto trace00; } next00: next0 = t0->decap_next_index; u32 len0 = vlib_buffer_length_in_chain (vm, b0); /* Required to make the l2 tag push / pop code work on l2 subifs */ if (PREDICT_TRUE(next0 == VXLAN_INPUT_NEXT_L2_INPUT)) vnet_update_l2_len (b0); /* Set packet input sw_if_index to unicast VXLAN tunnel for learning */ vnet_buffer(b0)->sw_if_index[VLIB_RX] = t0->sw_if_index; /* Batch stats increment on the same vxlan tunnel so counter is not incremented per packet */ u32 sw_if_index0 = stats_t0->sw_if_index; if (PREDICT_FALSE (sw_if_index0 != stats_sw_if_index)) { if (stats_n_packets) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); pkts_decapsulated += stats_n_packets; stats_n_packets = stats_n_bytes = 0; } stats_sw_if_index = sw_if_index0; } stats_n_packets += 1; stats_n_bytes += len0; trace00: b0->error = error0 ? node->errors[error0] : 0; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->next_index = next0; tr->error = error0; tr->tunnel_index = tunnel_index0; tr->vni = vnet_get_vni (vxlan0); } 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); } /* Increment any remaining batch stats */ if (stats_n_packets) { pkts_decapsulated += stats_n_packets; vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX, thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes); node->runtime_data[0] = stats_sw_if_index; } /* 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, pkts_decapsulated); return from_frame->n_vectors; } static uword vxlan4_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return vxlan_input(vm, node, from_frame, /* is_ip4 */ 1); } static uword vxlan6_input (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 #undef _ }; VLIB_REGISTER_NODE (vxlan4_input_node) = { .function = vxlan4_input, .name = "vxlan4-input", /* Takes a vector of packets. */ .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 _ }, //temp .format_buffer = format_vxlan_header, .format_trace = format_vxlan_rx_trace, // $$$$ .unformat_buffer = unformat_vxlan_header, }; VLIB_NODE_FUNCTION_MULTIARCH (vxlan4_input_node, vxlan4_input) VLIB_REGISTER_NODE (vxlan6_input_node) = { .function = vxlan6_input, .name = "vxlan6-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = VXLAN_N_ERROR, .error_strings = vxlan_error_strings, .n_next_nodes = VXLAN_INPUT_N_NEXT, .next_nodes = { #define _(s,n) [VXLAN_INPUT_NEXT_##s] = n, foreach_vxlan_input_next #undef _ }, //temp .format_buffer = format_vxlan_header, .format_trace = format_vxlan_rx_trace, // $$$$ .unformat_buffer = unformat_vxlan_header, }; VLIB_NODE_FUNCTION_MULTIARCH (vxlan6_input_node, vxlan6_input) typedef enum { IP_VXLAN_BYPASS_NEXT_DROP, IP_VXLAN_BYPASS_NEXT_VXLAN, IP_VXLAN_BYPASS_N_NEXT, } ip_vxan_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); ip4_address_t addr4; /* last IPv4 address matching a local VTEP address */ ip6_address_t addr6; /* last IPv6 address 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) addr4.data_u32 = ~0; else ip6_address_set_zero (&addr6); 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(vnet_buffer(b0)->sw_if_index[VLIB_RX], &next0, b0); vnet_feature_next(vnet_buffer(b1)->sw_if_index[VLIB_RX], &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 (addr4.as_u32 != ip40->dst_address.as_u32) { if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32)) goto exit0; /* no local VTEP for VXLAN packet */ addr4 = ip40->dst_address; } } else { if (!ip6_address_is_equal (&addr6, &ip60->dst_address)) { if (!hash_get_mem (vxm->vtep6, &ip60->dst_address)) goto exit0; /* no local VTEP for VXLAN packet */ addr6 = ip60->dst_address; } } 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 ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { 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 (addr4.as_u32 != ip41->dst_address.as_u32) { if (!hash_get (vxm->vtep4, ip41->dst_address.as_u32)) goto exit1; /* no local VTEP for VXLAN packet */ addr4 = ip41->dst_address; } } else { if (!ip6_address_is_equal (&addr6, &ip61->dst_address)) { if (!hash_get_mem (vxm->vtep6, &ip61->dst_address)) goto exit1; /* no local VTEP for VXLAN packet */ addr6 = ip61->dst_address; } } 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 ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { 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(vnet_buffer(b0)->sw_if_index[VLIB_RX], &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 (addr4.as_u32 != ip40->dst_address.as_u32) { if (!hash_get (vxm->vtep4, ip40->dst_address.as_u32)) goto exit; /* no local VTEP for VXLAN packet */ addr4 = ip40->dst_address; } } else { if (!ip6_address_is_equal (&addr6, &ip60->dst_address)) { if (!hash_get_mem (vxm->vtep6, &ip60->dst_address)) goto exit; /* no local VTEP for VXLAN packet */ addr6 = ip60->dst_address; } } 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 ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { 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; } static uword ip4_vxlan_bypass (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 1); } VLIB_REGISTER_NODE (ip4_vxlan_bypass_node) = { .function = ip4_vxlan_bypass, .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, }; VLIB_NODE_FUNCTION_MULTIARCH (ip4_vxlan_bypass_node,ip4_vxlan_bypass) /* Dummy init function to get us linked in. */ clib_error_t * ip4_vxlan_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip4_vxlan_bypass_init); static uword ip6_vxlan_bypass (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_vxlan_bypass_inline (vm, node, frame, /* is_ip4 */ 0); } VLIB_REGISTER_NODE (ip6_vxlan_bypass_node) = { .function = ip6_vxlan_bypass, .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, }; VLIB_NODE_FUNCTION_MULTIARCH (ip6_vxlan_bypass_node,ip6_vxlan_bypass) /* Dummy init function to get us linked in. */ clib_error_t * ip6_vxlan_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip6_vxlan_bypass_init);