/* * node.c: gre packet processing * * Copyright (c) 2012 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 <gre/gre.h> #include <vnet/mpls/mpls.h> #include <vppinfra/sparse_vec.h> #define foreach_gre_input_next \ _ (PUNT, "error-punt") \ _ (DROP, "error-drop") \ _ (ETHERNET_INPUT, "ethernet-input") \ _ (IP4_INPUT, "ip4-input") \ _ (IP6_INPUT, "ip6-input") \ _ (MPLS_INPUT, "mpls-input") typedef enum { #define _(s, n) GRE_INPUT_NEXT_##s, foreach_gre_input_next #undef _ GRE_INPUT_N_NEXT, } gre_input_next_t; typedef struct { u32 tunnel_id; u32 length; ip46_address_t src; ip46_address_t dst; } gre_rx_trace_t; extern u8 *format_gre_rx_trace (u8 *s, va_list *args); #ifndef CLIB_MARCH_VARIANT u8 * format_gre_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 *); gre_rx_trace_t *t = va_arg (*args, gre_rx_trace_t *); s = format (s, "GRE: 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; } #endif /* CLIB_MARCH_VARIANT */ typedef struct { /* Sparse vector mapping gre protocol in network byte order to next index. */ u16 *next_by_protocol; } gre_input_runtime_t; always_inline void gre_trace (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_buffer_t *b, u32 tun_sw_if_index, const ip6_header_t *ip6, const ip4_header_t *ip4, int is_ipv6) { gre_rx_trace_t *tr = vlib_add_trace (vm, node, b, sizeof (*tr)); tr->tunnel_id = tun_sw_if_index; if (is_ipv6) { tr->length = ip6->payload_length; tr->src.ip6.as_u64[0] = ip6->src_address.as_u64[0]; tr->src.ip6.as_u64[1] = ip6->src_address.as_u64[1]; tr->dst.ip6.as_u64[0] = ip6->dst_address.as_u64[0]; tr->dst.ip6.as_u64[1] = ip6->dst_address.as_u64[1]; } else { tr->length = ip4->length; tr->src.as_u64[0] = tr->src.as_u64[1] = 0; tr->dst.as_u64[0] = tr->dst.as_u64[1] = 0; tr->src.ip4.as_u32 = ip4->src_address.as_u32; tr->dst.ip4.as_u32 = ip4->dst_address.as_u32; } } always_inline void gre_tunnel_get (const gre_main_t *gm, vlib_node_runtime_t *node, vlib_buffer_t *b, u16 *next, const gre_tunnel_key_t *key, gre_tunnel_key_t *cached_key, u32 *tun_sw_if_index, u32 *cached_tun_sw_if_index, int is_ipv6) { const uword *p; p = is_ipv6 ? hash_get_mem (gm->tunnel_by_key6, &key->gtk_v6) : hash_get_mem (gm->tunnel_by_key4, &key->gtk_v4); if (PREDICT_FALSE (!p)) { *next = GRE_INPUT_NEXT_DROP; b->error = node->errors[GRE_ERROR_NO_SUCH_TUNNEL]; *tun_sw_if_index = ~0; } else { const gre_tunnel_t *tun; tun = pool_elt_at_index (gm->tunnels, *p); *cached_tun_sw_if_index = *tun_sw_if_index = tun->sw_if_index; if (is_ipv6) cached_key->gtk_v6 = key->gtk_v6; else cached_key->gtk_v4 = key->gtk_v4; } } always_inline uword gre_input (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, const int is_ipv6) { gre_main_t *gm = &gre_main; u32 *from, n_left_from; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; u16 nexts[VLIB_FRAME_SIZE], *next = nexts; u16 cached_protocol = ~0; u32 cached_next_index = SPARSE_VEC_INVALID_INDEX; u32 cached_tun_sw_if_index = ~0; gre_tunnel_key_t cached_key; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; vlib_get_buffers (vm, from, bufs, n_left_from); if (is_ipv6) clib_memset (&cached_key.gtk_v6, 0xff, sizeof (cached_key.gtk_v6)); else clib_memset (&cached_key.gtk_v4, 0xff, sizeof (cached_key.gtk_v4)); while (n_left_from >= 2) { const ip6_header_t *ip6[2]; const ip4_header_t *ip4[2]; const gre_header_t *gre[2]; u32 nidx[2]; next_info_t ni[2]; u8 type[2]; u16 version[2]; u32 len[2]; gre_tunnel_key_t key[2]; u8 matched[2]; u32 tun_sw_if_index[2]; if (PREDICT_TRUE (n_left_from >= 6)) { vlib_prefetch_buffer_data (b[2], LOAD); vlib_prefetch_buffer_data (b[3], LOAD); vlib_prefetch_buffer_header (b[4], STORE); vlib_prefetch_buffer_header (b[5], STORE); } if (is_ipv6) { /* ip6_local hands us the ip header, not the gre header */ ip6[0] = vlib_buffer_get_current (b[0]); ip6[1] = vlib_buffer_get_current (b[1]); gre[0] = (void *) (ip6[0] + 1); gre[1] = (void *) (ip6[1] + 1); vlib_buffer_advance (b[0], sizeof (*ip6[0]) + sizeof (*gre[0])); vlib_buffer_advance (b[1], sizeof (*ip6[0]) + sizeof (*gre[0])); } else { /* ip4_local hands us the ip header, not the gre header */ ip4[0] = vlib_buffer_get_current (b[0]); ip4[1] = vlib_buffer_get_current (b[1]); gre[0] = (void *) (ip4[0] + 1); gre[1] = (void *) (ip4[1] + 1); vlib_buffer_advance (b[0], sizeof (*ip4[0]) + sizeof (*gre[0])); vlib_buffer_advance (b[1], sizeof (*ip4[0]) + sizeof (*gre[0])); } if (PREDICT_TRUE (cached_protocol == gre[0]->protocol)) { nidx[0] = cached_next_index; } else { cached_next_index = nidx[0] = sparse_vec_index (gm->next_by_protocol, gre[0]->protocol); cached_protocol = gre[0]->protocol; } if (PREDICT_TRUE (cached_protocol == gre[1]->protocol)) { nidx[1] = cached_next_index; } else { cached_next_index = nidx[1] = sparse_vec_index (gm->next_by_protocol, gre[1]->protocol); cached_protocol = gre[1]->protocol; } ni[0] = vec_elt (gm->next_by_protocol, nidx[0]); ni[1] = vec_elt (gm->next_by_protocol, nidx[1]); next[0] = ni[0].next_index; next[1] = ni[1].next_index; type[0] = ni[0].tunnel_type; type[1] = ni[1].tunnel_type; b[0]->error = nidx[0] == SPARSE_VEC_INVALID_INDEX ? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL] : node->errors[GRE_ERROR_NONE]; b[1]->error = nidx[1] == SPARSE_VEC_INVALID_INDEX ? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL] : node->errors[GRE_ERROR_NONE]; version[0] = clib_net_to_host_u16 (gre[0]->flags_and_version); version[1] = clib_net_to_host_u16 (gre[1]->flags_and_version); version[0] &= GRE_VERSION_MASK; version[1] &= GRE_VERSION_MASK; b[0]->error = version[0] ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[0]->error; next[0] = version[0] ? GRE_INPUT_NEXT_DROP : next[0]; b[1]->error = version[1] ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[1]->error; next[1] = version[1] ? GRE_INPUT_NEXT_DROP : next[1]; len[0] = vlib_buffer_length_in_chain (vm, b[0]); len[1] = vlib_buffer_length_in_chain (vm, b[1]); /* always search for P2P types in the DP */ if (is_ipv6) { gre_mk_key6 (&ip6[0]->dst_address, &ip6[0]->src_address, vnet_buffer (b[0])->ip.fib_index, type[0], TUNNEL_MODE_P2P, 0, &key[0].gtk_v6); gre_mk_key6 (&ip6[1]->dst_address, &ip6[1]->src_address, vnet_buffer (b[1])->ip.fib_index, type[1], TUNNEL_MODE_P2P, 0, &key[1].gtk_v6); matched[0] = gre_match_key6 (&cached_key.gtk_v6, &key[0].gtk_v6); matched[1] = gre_match_key6 (&cached_key.gtk_v6, &key[1].gtk_v6); } else { gre_mk_key4 (ip4[0]->dst_address, ip4[0]->src_address, vnet_buffer (b[0])->ip.fib_index, type[0], TUNNEL_MODE_P2P, 0, &key[0].gtk_v4); gre_mk_key4 (ip4[1]->dst_address, ip4[1]->src_address, vnet_buffer (b[1])->ip.fib_index, type[1], TUNNEL_MODE_P2P, 0, &key[1].gtk_v4); matched[0] = gre_match_key4 (&cached_key.gtk_v4, &key[0].gtk_v4); matched[1] = gre_match_key4 (&cached_key.gtk_v4, &key[1].gtk_v4); } tun_sw_if_index[0] = cached_tun_sw_if_index; tun_sw_if_index[1] = cached_tun_sw_if_index; if (PREDICT_FALSE (!matched[0])) gre_tunnel_get (gm, node, b[0], &next[0], &key[0], &cached_key, &tun_sw_if_index[0], &cached_tun_sw_if_index, is_ipv6); if (PREDICT_FALSE (!matched[1])) gre_tunnel_get (gm, node, b[1], &next[1], &key[1], &cached_key, &tun_sw_if_index[1], &cached_tun_sw_if_index, is_ipv6); if (PREDICT_TRUE (next[0] > GRE_INPUT_NEXT_DROP)) { vlib_increment_combined_counter ( &gm->vnet_main->interface_main .combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], vm->thread_index, tun_sw_if_index[0], 1 /* packets */, len[0] /* bytes */); vnet_buffer (b[0])->sw_if_index[VLIB_RX] = tun_sw_if_index[0]; } if (PREDICT_TRUE (next[1] > GRE_INPUT_NEXT_DROP)) { vlib_increment_combined_counter ( &gm->vnet_main->interface_main .combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], vm->thread_index, tun_sw_if_index[1], 1 /* packets */, len[1] /* bytes */); vnet_buffer (b[1])->sw_if_index[VLIB_RX] = tun_sw_if_index[1]; } vnet_buffer (b[0])->sw_if_index[VLIB_TX] = (u32) ~0; vnet_buffer (b[1])->sw_if_index[VLIB_TX] = (u32) ~0; if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0], is_ipv6); if (PREDICT_FALSE (b[1]->flags & VLIB_BUFFER_IS_TRACED)) gre_trace (vm, node, b[1], tun_sw_if_index[1], ip6[1], ip4[1], is_ipv6); b += 2; next += 2; n_left_from -= 2; } while (n_left_from >= 1) { const ip6_header_t *ip6[1]; const ip4_header_t *ip4[1]; const gre_header_t *gre[1]; u32 nidx[1]; next_info_t ni[1]; u8 type[1]; u16 version[1]; u32 len[1]; gre_tunnel_key_t key[1]; u8 matched[1]; u32 tun_sw_if_index[1]; if (PREDICT_TRUE (n_left_from >= 3)) { vlib_prefetch_buffer_data (b[1], LOAD); vlib_prefetch_buffer_header (b[2], STORE); } if (is_ipv6) { /* ip6_local hands us the ip header, not the gre header */ ip6[0] = vlib_buffer_get_current (b[0]); gre[0] = (void *) (ip6[0] + 1); vlib_buffer_advance (b[0], sizeof (*ip6[0]) + sizeof (*gre[0])); } else { /* ip4_local hands us the ip header, not the gre header */ ip4[0] = vlib_buffer_get_current (b[0]); gre[0] = (void *) (ip4[0] + 1); vlib_buffer_advance (b[0], sizeof (*ip4[0]) + sizeof (*gre[0])); } if (PREDICT_TRUE (cached_protocol == gre[0]->protocol)) { nidx[0] = cached_next_index; } else { cached_next_index = nidx[0] = sparse_vec_index (gm->next_by_protocol, gre[0]->protocol); cached_protocol = gre[0]->protocol; } ni[0] = vec_elt (gm->next_by_protocol, nidx[0]); next[0] = ni[0].next_index; type[0] = ni[0].tunnel_type; b[0]->error = nidx[0] == SPARSE_VEC_INVALID_INDEX ? node->errors[GRE_ERROR_UNKNOWN_PROTOCOL] : node->errors[GRE_ERROR_NONE]; version[0] = clib_net_to_host_u16 (gre[0]->flags_and_version); version[0] &= GRE_VERSION_MASK; b[0]->error = version[0] ? node->errors[GRE_ERROR_UNSUPPORTED_VERSION] : b[0]->error; next[0] = version[0] ? GRE_INPUT_NEXT_DROP : next[0]; len[0] = vlib_buffer_length_in_chain (vm, b[0]); if (is_ipv6) { gre_mk_key6 (&ip6[0]->dst_address, &ip6[0]->src_address, vnet_buffer (b[0])->ip.fib_index, type[0], TUNNEL_MODE_P2P, 0, &key[0].gtk_v6); matched[0] = gre_match_key6 (&cached_key.gtk_v6, &key[0].gtk_v6); } else { gre_mk_key4 (ip4[0]->dst_address, ip4[0]->src_address, vnet_buffer (b[0])->ip.fib_index, type[0], TUNNEL_MODE_P2P, 0, &key[0].gtk_v4); matched[0] = gre_match_key4 (&cached_key.gtk_v4, &key[0].gtk_v4); } tun_sw_if_index[0] = cached_tun_sw_if_index; if (PREDICT_FALSE (!matched[0])) gre_tunnel_get (gm, node, b[0], &next[0], &key[0], &cached_key, &tun_sw_if_index[0], &cached_tun_sw_if_index, is_ipv6); if (PREDICT_TRUE (next[0] > GRE_INPUT_NEXT_DROP)) { vlib_increment_combined_counter ( &gm->vnet_main->interface_main .combined_sw_if_counters[VNET_INTERFACE_COUNTER_RX], vm->thread_index, tun_sw_if_index[0], 1 /* packets */, len[0] /* bytes */); vnet_buffer (b[0])->sw_if_index[VLIB_RX] = tun_sw_if_index[0]; } vnet_buffer (b[0])->sw_if_index[VLIB_TX] = (u32) ~0; if (PREDICT_FALSE (b[0]->flags & VLIB_BUFFER_IS_TRACED)) gre_trace (vm, node, b[0], tun_sw_if_index[0], ip6[0], ip4[0], is_ipv6); b += 1; next += 1; n_left_from -= 1; } vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); vlib_node_increment_counter ( vm, is_ipv6 ? gre6_input_node.index : gre4_input_node.index, GRE_ERROR_PKTS_DECAP, n_left_from); return frame->n_vectors; } VLIB_NODE_FN (gre4_input_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) { return gre_input (vm, node, from_frame, /* is_ip6 */ 0); } VLIB_NODE_FN (gre6_input_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame) { return gre_input (vm, node, from_frame, /* is_ip6 */ 1); } static char *gre_error_strings[] = { #define gre_error(n, s) s, #include "error.def" #undef gre_error }; /* *INDENT-OFF* */ VLIB_REGISTER_NODE (gre4_input_node) = { .name = "gre4-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = GRE_N_ERROR, .error_strings = gre_error_strings, .n_next_nodes = GRE_INPUT_N_NEXT, .next_nodes = { #define _(s, n) [GRE_INPUT_NEXT_##s] = n, foreach_gre_input_next #undef _ }, .format_buffer = format_gre_header_with_length, .format_trace = format_gre_rx_trace, .unformat_buffer = unformat_gre_header, }; VLIB_REGISTER_NODE (gre6_input_node) = { .name = "gre6-input", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .runtime_data_bytes = sizeof (gre_input_runtime_t), .n_errors = GRE_N_ERROR, .error_strings = gre_error_strings, .n_next_nodes = GRE_INPUT_N_NEXT, .next_nodes = { #define _(s, n) [GRE_INPUT_NEXT_##s] = n, foreach_gre_input_next #undef _ }, .format_buffer = format_gre_header_with_length, .format_trace = format_gre_rx_trace, .unformat_buffer = unformat_gre_header, }; /* *INDENT-ON* */ #ifndef CLIB_MARCH_VARIANT void gre_register_input_protocol (vlib_main_t *vm, gre_protocol_t protocol, u32 node_index, gre_tunnel_type_t tunnel_type) { gre_main_t *em = &gre_main; gre_protocol_info_t *pi; next_info_t *n; u32 i; { clib_error_t *error = vlib_call_init_function (vm, gre_input_init); if (error) clib_error_report (error); } pi = gre_get_protocol_info (em, protocol); pi->node_index = node_index; pi->tunnel_type = tunnel_type; pi->next_index = vlib_node_add_next (vm, gre4_input_node.index, node_index); i = vlib_node_add_next (vm, gre6_input_node.index, node_index); ASSERT (i == pi->next_index); /* Setup gre protocol -> next index sparse vector mapping. */ n = sparse_vec_validate (em->next_by_protocol, clib_host_to_net_u16 (protocol)); n->next_index = pi->next_index; n->tunnel_type = tunnel_type; } static void gre_setup_node (vlib_main_t *vm, u32 node_index) { vlib_node_t *n = vlib_get_node (vm, node_index); pg_node_t *pn = pg_get_node (node_index); n->format_buffer = format_gre_header_with_length; n->unformat_buffer = unformat_gre_header; pn->unformat_edit = unformat_pg_gre_header; } static clib_error_t * gre_input_init (vlib_main_t *vm) { gre_main_t *gm = &gre_main; vlib_node_t *ethernet_input, *ip4_input, *ip6_input, *mpls_unicast_input; { clib_error_t *error; error = vlib_call_init_function (vm, gre_init); if (error) clib_error_report (error); } gre_setup_node (vm, gre4_input_node.index); gre_setup_node (vm, gre6_input_node.index); gm->next_by_protocol = sparse_vec_new (/* elt bytes */ sizeof (gm->next_by_protocol[0]), /* bits in index */ BITS (((gre_header_t *) 0)->protocol)); /* These could be moved to the supported protocol input node defn's */ ethernet_input = vlib_get_node_by_name (vm, (u8 *) "ethernet-input"); ASSERT (ethernet_input); ip4_input = vlib_get_node_by_name (vm, (u8 *) "ip4-input"); ASSERT (ip4_input); ip6_input = vlib_get_node_by_name (vm, (u8 *) "ip6-input"); ASSERT (ip6_input); mpls_unicast_input = vlib_get_node_by_name (vm, (u8 *) "mpls-input"); ASSERT (mpls_unicast_input); gre_register_input_protocol (vm, GRE_PROTOCOL_teb, ethernet_input->index, GRE_TUNNEL_TYPE_TEB); gre_register_input_protocol (vm, GRE_PROTOCOL_ip4, ip4_input->index, GRE_TUNNEL_TYPE_L3); gre_register_input_protocol (vm, GRE_PROTOCOL_ip6, ip6_input->index, GRE_TUNNEL_TYPE_L3); gre_register_input_protocol (vm, GRE_PROTOCOL_mpls_unicast, mpls_unicast_input->index, GRE_TUNNEL_TYPE_L3); return 0; } VLIB_INIT_FUNCTION (gre_input_init); #endif /* CLIB_MARCH_VARIANT */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */