diff options
Diffstat (limited to 'src/plugins/gre/node.c')
| -rw-r--r-- | src/plugins/gre/node.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/src/plugins/gre/node.c b/src/plugins/gre/node.c new file mode 100644 index 00000000000..5235888cc6f --- /dev/null +++ b/src/plugins/gre/node.c @@ -0,0 +1,574 @@ +/* + * 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 +}; + +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, +}; + +#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: + */ |