/* * 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. */ /** * @file * @brief Functions for encapsulating VXLAN GPE tunnels * */ #include #include #include #include #include #include /** Statistics (not really errors) */ #define foreach_vxlan_gpe_encap_error \ _(ENCAPSULATED, "good packets encapsulated") /** * @brief VXLAN GPE encap error strings */ static char *vxlan_gpe_encap_error_strings[] = { #define _(sym,string) string, foreach_vxlan_gpe_encap_error #undef _ }; /** * @brief Struct for VXLAN GPE errors/counters */ typedef enum { #define _(sym,str) VXLAN_GPE_ENCAP_ERROR_##sym, foreach_vxlan_gpe_encap_error #undef _ VXLAN_GPE_ENCAP_N_ERROR, } vxlan_gpe_encap_error_t; /** * @brief Struct for tracing VXLAN GPE encapsulated packets */ typedef struct { u32 tunnel_index; } vxlan_gpe_encap_trace_t; /** * @brief Trace of packets encapsulated in VXLAN GPE * * @param *s * @param *args * * @return *s * */ u8 * format_vxlan_gpe_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_gpe_encap_trace_t *t = va_arg (*args, vxlan_gpe_encap_trace_t *); s = format (s, "VXLAN-GPE-ENCAP: tunnel %d", t->tunnel_index); return s; } /** * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup * * @param *ngm * @param *b0 * @param *t0 contains rewrite header * @param *next0 relative index of next dispatch function (next node) * @param is_v4 Is this IPv4? (or IPv6) * */ always_inline void vxlan_gpe_encap_one_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0, vxlan_gpe_tunnel_t * t0, u32 * next0, u8 is_v4) { ASSERT (sizeof (ip4_vxlan_gpe_header_t) == 36); ASSERT (sizeof (ip6_vxlan_gpe_header_t) == 56); ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4); next0[0] = t0->encap_next_node; } /** * @brief Instantiates UDP + VXLAN-GPE header then set next node to IP4|6 lookup for two packets * * @param *ngm * @param *b0 Packet0 * @param *b1 Packet1 * @param *t0 contains rewrite header for Packet0 * @param *t1 contains rewrite header for Packet1 * @param *next0 relative index of next dispatch function (next node) for Packet0 * @param *next1 relative index of next dispatch function (next node) for Packet1 * @param is_v4 Is this IPv4? (or IPv6) * */ always_inline void vxlan_gpe_encap_two_inline (vxlan_gpe_main_t * ngm, vlib_buffer_t * b0, vlib_buffer_t * b1, vxlan_gpe_tunnel_t * t0, vxlan_gpe_tunnel_t * t1, u32 * next0, u32 * next1, u8 is_v4) { ASSERT (sizeof (ip4_vxlan_gpe_header_t) == 36); ASSERT (sizeof (ip6_vxlan_gpe_header_t) == 56); ip_udp_encap_one (ngm->vlib_main, b0, t0->rewrite, t0->rewrite_size, is_v4); ip_udp_encap_one (ngm->vlib_main, b1, t1->rewrite, t1->rewrite_size, is_v4); next0[0] = next1[0] = t0->encap_next_node; } /** * @brief Common processing for IPv4 and IPv6 VXLAN GPE encap dispatch functions * * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE * tunnels are "establish local". This means that we don't have a TX interface as yet * as we need to look up where the outer-header dest is. By setting the TX index in the * buffer metadata to the encap FIB, we can do a lookup to get the adjacency and real TX. * * vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->encap_fib_index; * * @node vxlan-gpe-input * @param *vm * @param *node * @param *from_frame * * @return from_frame->n_vectors * */ static uword vxlan_gpe_encap (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { u32 n_left_from, next_index, *from, *to_next; vxlan_gpe_main_t *ngm = &vxlan_gpe_main; vnet_main_t *vnm = ngm->vnet_main; vnet_interface_main_t *im = &vnm->interface_main; u32 pkts_encapsulated = 0; u32 thread_index = vlib_get_thread_index (); u32 stats_sw_if_index, stats_n_packets, stats_n_bytes; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; next_index = node->cached_next_index; stats_sw_if_index = node->runtime_data[0]; stats_n_packets = stats_n_bytes = 0; 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) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, next1; u32 sw_if_index0, sw_if_index1, len0, len1; vnet_hw_interface_t *hi0, *hi1; vxlan_gpe_tunnel_t *t0, *t1; u8 is_ip4_0, is_ip4_1; next0 = next1 = VXLAN_GPE_ENCAP_NEXT_IP4_LOOKUP; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer