/* * 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 <vppinfra/error.h> #include <vppinfra/hash.h> #include <vnet/vnet.h> #include <vnet/ip/ip.h> #include <vnet/ethernet/ethernet.h> #include <vnet/vxlan/vxlan.h> #include <vnet/qos/qos_types.h> #include <vnet/adj/rewrite.h> /* Statistics (not all errors) */ #define foreach_vxlan_encap_error \ _(ENCAPSULATED, "good packets encapsulated") static char * vxlan_encap_error_strings[] = { #define _(sym,string) string, foreach_vxlan_encap_error #undef _ }; typedef enum { #define _(sym,str) VXLAN_ENCAP_ERROR_##sym, foreach_vxlan_encap_error #undef _ VXLAN_ENCAP_N_ERROR, } vxlan_encap_error_t; typedef enum { VXLAN_ENCAP_NEXT_DROP, VXLAN_ENCAP_N_NEXT, } vxlan_encap_next_t; typedef struct { u32 tunnel_index; u32 vni; } vxlan_encap_trace_t; #ifndef CLIB_MARCH_VARIANT u8 * format_vxlan_encap_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_encap_trace_t * t = va_arg (*args, vxlan_encap_trace_t *); s = format (s, "VXLAN encap to vxlan_tunnel%d vni %d", t->tunnel_index, t->vni); return s; } #endif always_inline uword vxlan_encap_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, u8 is_ip4, u8 csum_offload) { u32 n_left_from, next_index, * from, * to_next; 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 * tx_counter = im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX; u32 pkts_encapsulated = 0; u32 thread_index = vlib_get_thread_index(); u32 sw_if_index0 = 0, sw_if_index1 = 0; u32 next0 = 0, next1 = 0; vxlan_tunnel_t * t0 = NULL, * t1 = NULL; index_t dpoi_idx0 = INDEX_INVALID, dpoi_idx1 = INDEX_INVALID; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; next_index = node->cached_next_index; STATIC_ASSERT_SIZEOF(ip6_vxlan_header_t, 56); STATIC_ASSERT_SIZEOF(ip4_vxlan_header_t, 36); u8 const underlay_hdr_len = is_ip4 ? sizeof(ip4_vxlan_header_t) : sizeof(ip6_vxlan_header_t); u8 const rw_hdr_offset = sizeof t0->rewrite_data - underlay_hdr_len; u16 const l3_len = is_ip4 ? sizeof(ip4_header_t) : sizeof(ip6_header_t); u32 const csum_flags = is_ip4 ? VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_OFFLOAD_UDP_CKSUM : VNET_BUFFER_F_OFFLOAD_UDP_CKSUM; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { /* Prefetch next iteration. */ { vlib_buffer_t * p2, * p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data - CLIB_CACHE_LINE_BYTES, 2 * CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data - CLIB_CACHE_LINE_BYTES, 2 * CLIB_CACHE_LINE_BYTES, LOAD); } u32 bi0 = to_next[0] = from[0]; u32 bi1 = to_next[1] = from[1]; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0); vlib_buffer_t * b1 = vlib_get_buffer (vm, bi1); u32 flow_hash0 = vnet_l2_compute_flow_hash (b0); u32 flow_hash1 = vnet_l2_compute_flow_hash (b1); /* Get next node index and adj index from tunnel next_dpo */ if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX]) { sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX]; vnet_hw_interface_t *hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0); t0 = &vxm->tunnels[hi0->dev_instance]; /* Note: change to always set next0 if it may set to drop */ next0 = t0->next_dpo.dpoi_next_node; dpoi_idx0 = t0->next_dpo.dpoi_index; } /* Get next node index and adj index from tunnel next_dpo */ if (sw_if_index1 != vnet_buffer(b1)->sw_if_index[VLIB_TX]) { if (sw_if_index0 == vnet_buffer(b1)->sw_if_index[VLIB_TX]) { sw_if_index1 = sw_if_index0; t1 = t0; next1 = next0; dpoi_idx1 = dpoi_idx0; } else { sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_TX]; vnet_hw_interface_t *hi1 = vnet_get_sup_hw_interface (vnm, sw_if_index1); t1 = &vxm->tunnels[hi1->dev_instance]; /* Note: change to always set next1 if it may set to drop */ next1 = t1->next_dpo.dpoi_next_node; dpoi_idx1 = t1->next_dpo.dpoi_index; } } vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0; vnet_buffer(b1)->ip.adj_index[VLIB_TX] = dpoi_idx1; ASSERT(t0->rewrite_header.data_bytes == underlay_hdr_len); ASSERT(t1->rewrite_header.data_bytes == underlay_hdr_len); vlib_buffer_advance (b0, -underlay_hdr_len); vlib_buffer_advance (b1, -underlay_hdr_len); u32 len0 = vlib_buffer_length_in_chain (vm, b0); u32 len1 = vlib_buffer_length_in_chain (vm, b1); u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len); u16 payload_l1 = clib_host_to_net_u16 (len1 - l3_len); void * underlay0 = vlib_buffer_get_current(b0); void * underlay1 = vlib_buffer_get_current(b1); /* vnet_rewrite_two_header writes only in (uword) 8 bytes chunks * and discards the first 4 bytes of the (36 bytes ip4 underlay) rewrite * use memcpy as a workaround */ clib_memcpy_fast(underlay0, t0->rewrite_header.data + rw_hdr_offset, underlay_hdr_len); clib_memcpy_fast(underlay1, t1->rewrite_header.data + rw_hdr_offset, underlay_hdr_len); ip4_header_t * ip4_0, * ip4_1; qos_bits_t ip4_0_tos = 0, ip4_1_tos = 0; ip6_header_t * ip6_0, * ip6_1; udp_header_t * udp0, * udp1; u8 * l3_0, * l3_1; if (is_ip4) { ip4_vxlan_header_t * hdr0 = underlay0; ip4_vxlan_header_t * hdr1 = underlay1; /* Fix the IP4 checksum and length */ ip4_0 = &hdr0->ip4; ip4_1 = &hdr1->ip4; ip4_0->length = clib_host_to_net_u16 (len0); ip4_1->length = clib_host_to_net_u16 (len1); if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID)) { ip4_0_tos = vnet_buffer2 (b0)->qos.bits; ip4_0->tos = ip4_0_tos; } if (PREDICT_FALSE (b1->flags & VNET_BUFFER_F_QOS_DATA_VALID)) { ip4_1_tos = vnet_buffer2 (b1)->qos.bits; ip4_1->tos = ip4_1_tos; } l3_0 = (u8 *)ip4_0; l3_1 = (u8 *)ip4_1; udp0 = &hdr0->udp; udp1 = &hdr1->udp; } else /* ipv6 */ { ip6_vxlan_header_t * hdr0 = underlay0; ip6_vxlan_header_t * hdr1 = underlay1; /* Fix IP6 payload length */ ip6_0 = &hdr0->ip6; ip6_1 = &hdr1->ip6; ip6_0->payload_length = payload_l0; ip6_1->payload_length = payload_l1; l3_0 = (u8 *)ip6_0; l3_1 = (u8 *)ip6_1; udp0 = &hdr0->udp; udp1 = &hdr1->udp; } /* Fix UDP length and set source port */ udp0->length = payload_l0; udp0->src_port = flow_hash0; udp1->length = payload_l1; udp1->src_port = flow_hash1; if (csum_offload) { b0->flags |= csum_flags; vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data; vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data; b1->flags |= csum_flags; vnet_buffer (b1)->l3_hdr_offset = l3_1 - b1->data; vnet_buffer (b1)->l4_hdr_offset = (u8 *) udp1 - b1->data; } /* IPv4 UDP checksum only if checksum offload is used */ else if (is_ip4) { ip_csum_t sum0 = ip4_0->checksum; sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t, length /* changed member */); if (PREDICT_FALSE (ip4_0_tos)) { sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t, tos /* changed member */); } ip4_0->checksum = ip_csum_fold (sum0); ip_csum_t sum1 = ip4_1->checksum; sum1 = ip_csum_update (sum1, 0, ip4_1->length, ip4_header_t, length /* changed member */); if (PREDICT_FALSE (ip4_1_tos)) { sum1 = ip_csum_update (sum1, 0, ip4_1_tos, ip4_header_t, tos /* changed member */); } ip4_1->checksum = ip_csum_fold (sum1); } /* IPv6 UDP checksum is mandatory */ else { int bogus = 0; udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus); ASSERT(bogus == 0); if (udp0->checksum == 0) udp0->checksum = 0xffff; udp1->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip6_1, &bogus); ASSERT(bogus == 0); if (udp1->checksum == 0) udp1->checksum = 0xffff; } if (sw_if_index0 == sw_if_index1) { vlib_increment_combined_counter (tx_counter, thread_index, sw_if_index0, 2, len0 + len1); } else { vlib_increment_combined_counter (tx_counter, thread_index, sw_if_index0, 1, len0); vlib_increment_combined_counter (tx_counter, thread_index, sw_if_index1, 1, len1); } pkts_encapsulated += 2; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_encap_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_index = t0 - vxm->tunnels; tr->vni = t0->vni; } if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_encap_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); tr->tunnel_index = t1 - vxm->tunnels; tr->vni = t1->vni; } 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 = to_next[0] = from[0]; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; vlib_buffer_t * b0 = vlib_get_buffer (vm, bi0); u32 flow_hash0 = vnet_l2_compute_flow_hash(b0); /* Get next node index and adj index from tunnel next_dpo */ if (sw_if_index0 != vnet_buffer(b0)->sw_if_index[VLIB_TX]) { sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_TX]; vnet_hw_interface_t *hi0 = vnet_get_sup_hw_interface (vnm, sw_if_index0); t0 = &vxm->tunnels[hi0->dev_instance]; /* Note: change to always set next0 if it may be set to drop */ next0 = t0->next_dpo.dpoi_next_node; dpoi_idx0 = t0->next_dpo.dpoi_index; } vnet_buffer(b0)->ip.adj_index[VLIB_TX] = dpoi_idx0; ASSERT(t0->rewrite_header.data_bytes == underlay_hdr_len); vlib_buffer_advance (b0, -underlay_hdr_len); void * underlay0 = vlib_buffer_get_current(b0); /* vnet_rewrite_one_header writes only in (uword) 8 bytes chunks * and discards the first 4 bytes of the (36 bytes ip4 underlay) rewrite * use memcpy as a workaround */ clib_memcpy_fast(underlay0, t0->rewrite_header.data + rw_hdr_offset, underlay_hdr_len); u32 len0 = vlib_buffer_length_in_chain (vm, b0); u16 payload_l0 = clib_host_to_net_u16 (len0 - l3_len); udp_header_t * udp0; ip4_header_t * ip4_0; qos_bits_t ip4_0_tos = 0; ip6_header_t * ip6_0; u8 * l3_0; if (is_ip4) { ip4_vxlan_header_t * hdr = underlay0; /* Fix the IP4 checksum and length */ ip4_0 = &hdr->ip4; ip4_0->length = clib_host_to_net_u16 (len0); if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_QOS_DATA_VALID)) { ip4_0_tos = vnet_buffer2 (b0)->qos.bits; ip4_0->tos = ip4_0_tos; } l3_0 = (u8*)ip4_0; udp0 = &hdr->udp; } else /* ip6 path */ { ip6_vxlan_header_t * hdr = underlay0; /* Fix IP6 payload length */ ip6_0 = &hdr->ip6; ip6_0->payload_length = payload_l0; l3_0 = (u8 *)ip6_0; udp0 = &hdr->udp; } /* Fix UDP length and set source port */ udp0->length = payload_l0; udp0->src_port = flow_hash0; if (csum_offload) { b0->flags |= csum_flags; vnet_buffer (b0)->l3_hdr_offset = l3_0 - b0->data; vnet_buffer (b0)->l4_hdr_offset = (u8 *) udp0 - b0->data; } /* IPv4 UDP checksum only if checksum offload is used */ else if (is_ip4) { ip_csum_t sum0 = ip4_0->checksum; sum0 = ip_csum_update (sum0, 0, ip4_0->length, ip4_header_t, length /* changed member */); if (PREDICT_FALSE (ip4_0_tos)) { sum0 = ip_csum_update (sum0, 0, ip4_0_tos, ip4_header_t, tos /* changed member */); } ip4_0->checksum = ip_csum_fold (sum0); } /* IPv6 UDP checksum is mandatory */ else { int bogus = 0; udp0->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip6_0, &bogus); ASSERT(bogus == 0); if (udp0->checksum == 0) udp0->checksum = 0xffff; } vlib_increment_combined_counter (tx_counter, thread_index, sw_if_index0, 1, len0); pkts_encapsulated ++; if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { vxlan_encap_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->tunnel_index = t0 - vxm->tunnels; 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); } /* Do we still need this now that tunnel tx stats is kept? */ vlib_node_increment_counter (vm, node->node_index, VXLAN_ENCAP_ERROR_ENCAPSULATED, pkts_encapsulated); return from_frame->n_vectors; } VLIB_NODE_FN (vxlan4_encap_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { /* Disable chksum offload as setup overhead in tx node is not worthwhile for ip4 header checksum only, unless udp checksum is also required */ return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 1, /* csum_offload */ 0); } VLIB_NODE_FN (vxlan6_encap_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { /* Enable checksum offload for ip6 as udp checksum is mandatory, */ return vxlan_encap_inline (vm, node, from_frame, /* is_ip4 */ 0, /* csum_offload */ 1); } VLIB_REGISTER_NODE (vxlan4_encap_node) = { .name = "vxlan4-encap", .vector_size = sizeof (u32), .format_trace = format_vxlan_encap_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(vxlan_encap_error_strings), .error_strings = vxlan_encap_error_strings, .n_next_nodes = VXLAN_ENCAP_N_NEXT, .next_nodes = { [VXLAN_ENCAP_NEXT_DROP] = "error-drop", }, }; VLIB_REGISTER_NODE (vxlan6_encap_node) = { .name = "vxlan6-encap", .vector_size = sizeof (u32), .format_trace = format_vxlan_encap_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(vxlan_encap_error_strings), .error_strings = vxlan_encap_error_strings, .n_next_nodes = VXLAN_ENCAP_N_NEXT, .next_nodes = { [VXLAN_ENCAP_NEXT_DROP] = "error-drop", }, };