diff options
Diffstat (limited to 'vnet/vnet/mpls/mpls_output.c')
| -rw-r--r-- | vnet/vnet/mpls/mpls_output.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/vnet/vnet/mpls/mpls_output.c b/vnet/vnet/mpls/mpls_output.c new file mode 100644 index 00000000..932fcb8d --- /dev/null +++ b/vnet/vnet/mpls/mpls_output.c @@ -0,0 +1,343 @@ +/* + * mpls_output.c: MPLS Adj rewrite + * + * Copyright (c) 2012-2014 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/mpls/mpls.h> + +typedef struct { + /* Adjacency taken. */ + u32 adj_index; + u32 flow_hash; + + /* Packet data, possibly *after* rewrite. */ + u8 packet_data[64 - 1*sizeof(u32)]; +} mpls_output_trace_t; + +static u8 * +format_mpls_output_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 *); + mpls_output_trace_t * t = va_arg (*args, mpls_output_trace_t *); + vnet_main_t * vnm = vnet_get_main(); + uword indent = format_get_indent (s); + + s = format (s, "adj-idx %d : %U flow hash: 0x%08x", + t->adj_index, + format_ip_adjacency, vnm, t->adj_index, FORMAT_IP_ADJACENCY_NONE, + t->flow_hash); + s = format (s, "\n%U%U", + format_white_space, indent, + format_ip_adjacency_packet_data, + vnm, t->adj_index, + t->packet_data, sizeof (t->packet_data)); + return s; +} + +static inline uword +mpls_output_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next, cpu_index; + vlib_node_runtime_t * error_node; + + cpu_index = os_get_cpu_number(); + error_node = vlib_node_get_runtime (vm, mpls_output_node.index); + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + next_index = node->cached_next_index; + + 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 > 0 && n_left_to_next > 0) + { + ip_adjacency_t * adj0; + mpls_unicast_header_t *hdr0; + vlib_buffer_t * p0; + u32 pi0, rw_len0, adj_index0, next0, error0; + + pi0 = to_next[0] = from[0]; + + p0 = vlib_get_buffer (vm, pi0); + + adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; + + /* We should never rewrite a pkt using the MISS adjacency */ + ASSERT(adj_index0); + + adj0 = adj_get(adj_index0); + hdr0 = vlib_buffer_get_current (p0); + + /* Guess we are only writing on simple Ethernet header. */ + vnet_rewrite_one_header (adj0[0], hdr0, + sizeof (ethernet_header_t)); + + /* Update packet buffer attributes/set output interface. */ + rw_len0 = adj0[0].rewrite_header.data_bytes; + + if (PREDICT_FALSE (rw_len0 > sizeof(ethernet_header_t))) + vlib_increment_combined_counter + (&adjacency_counters, + cpu_index, adj_index0, + /* packet increment */ 0, + /* byte increment */ rw_len0-sizeof(ethernet_header_t)); + + /* Check MTU of outgoing interface. */ + error0 = (vlib_buffer_length_in_chain (vm, p0) + > adj0[0].rewrite_header.max_l3_packet_bytes + ? IP4_ERROR_MTU_EXCEEDED + : IP4_ERROR_NONE); + + p0->error = error_node->errors[error0]; + + /* Don't adjust the buffer for ttl issue; icmp-error node wants + * to see the IP headerr */ + if (PREDICT_TRUE(error0 == IP4_ERROR_NONE)) + { + p0->current_data -= rw_len0; + p0->current_length += rw_len0; + + vnet_buffer (p0)->sw_if_index[VLIB_TX] = + adj0[0].rewrite_header.sw_if_index; + next0 = adj0[0].rewrite_header.next_index; + } + else + { + next0 = MPLS_OUTPUT_NEXT_DROP; + } + + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + + if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED)) + { + mpls_output_trace_t *tr = vlib_add_trace (vm, node, + p0, sizeof (*tr)); + tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX]; + tr->flow_hash = vnet_buffer(p0)->ip.flow_hash; + } + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + pi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + vlib_node_increment_counter (vm, mpls_output_node.index, + MPLS_ERROR_PKTS_ENCAP, + from_frame->n_vectors); + + return from_frame->n_vectors; +} + +static char * mpls_error_strings[] = { +#define mpls_error(n,s) s, +#include "error.def" +#undef mpls_error +}; + +static inline uword +mpls_output (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return (mpls_output_inline(vm, node, from_frame)); +} + +VLIB_REGISTER_NODE (mpls_output_node) = { + .function = mpls_output, + .name = "mpls-output", + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + .n_errors = MPLS_N_ERROR, + .error_strings = mpls_error_strings, + + .n_next_nodes = MPLS_OUTPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [MPLS_OUTPUT_NEXT_##s] = n, + foreach_mpls_output_next +#undef _ + }, + + .format_trace = format_mpls_output_trace, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (mpls_output_node, mpls_output) + +static inline uword +mpls_midchain (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return (mpls_output_inline(vm, node, from_frame)); +} + +VLIB_REGISTER_NODE (mpls_midchain_node) = { + .function = mpls_output, + .name = "mpls-midchain", + .vector_size = sizeof (u32), + + .format_trace = format_mpls_output_trace, + + .sibling_of = "mpls-output", +}; + +VLIB_NODE_FUNCTION_MULTIARCH (mpls_midchain_node, mpls_midchain) + +/** + * @brief Next index values from the MPLS incomplete adj node + */ +#define foreach_mpls_adj_incomplete_next \ +_(DROP, "error-drop") \ +_(IP4, "ip4-arp") \ +_(IP6, "ip6-discover-neighbor") + +typedef enum { +#define _(s,n) MPLS_ADJ_INCOMPLETE_NEXT_##s, + foreach_mpls_adj_incomplete_next +#undef _ + MPLS_ADJ_INCOMPLETE_N_NEXT, +} mpls_adj_incomplete_next_t; + +/** + * @brief A struct to hold tracing information for the MPLS label imposition + * node. + */ +typedef struct mpls_adj_incomplete_trace_t_ +{ + u32 next; +} mpls_adj_incomplete_trace_t; + + +/** + * @brief Graph node for incomplete MPLS adjacency. + * This node will push traffic to either the v4-arp or v6-nd node + * based on the next-hop proto of the adj. + * We pay a cost for this 'routing' node, but an incomplete adj is the + * exception case. + */ +static inline uword +mpls_adj_incomplete (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + next_index = node->cached_next_index; + + 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 > 0 && n_left_to_next > 0) + { + u32 pi0, next0, adj_index0; + ip_adjacency_t * adj0; + vlib_buffer_t * p0; + + pi0 = to_next[0] = from[0]; + p0 = vlib_get_buffer (vm, pi0); + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + + adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX]; + ASSERT(adj_index0); + + adj0 = adj_get(adj_index0); + + if (PREDICT_TRUE(FIB_PROTOCOL_IP4 == adj0->ia_nh_proto)) + { + next0 = MPLS_ADJ_INCOMPLETE_NEXT_IP4; + } + else + { + next0 = MPLS_ADJ_INCOMPLETE_NEXT_IP6; + } + + if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED)) + { + mpls_adj_incomplete_trace_t *tr = + vlib_add_trace (vm, node, p0, sizeof (*tr)); + tr->next = next0; + } + + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + pi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + return from_frame->n_vectors; +} + +static u8 * +format_mpls_adj_incomplete_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 *); + mpls_adj_incomplete_trace_t * t; + uword indent; + + t = va_arg (*args, mpls_adj_incomplete_trace_t *); + indent = format_get_indent (s); + + s = format (s, "%Unext:%d", + format_white_space, indent, + t->next); + return (s); +} + +VLIB_REGISTER_NODE (mpls_adj_incomplete_node) = { + .function = mpls_adj_incomplete, + .name = "mpls-adj-incomplete", + .format_trace = format_mpls_adj_incomplete_trace, + /* Takes a vector of packets. */ + .vector_size = sizeof (u32), + .n_errors = MPLS_N_ERROR, + .error_strings = mpls_error_strings, + + .n_next_nodes = MPLS_ADJ_INCOMPLETE_N_NEXT, + .next_nodes = { +#define _(s,n) [MPLS_ADJ_INCOMPLETE_NEXT_##s] = n, + foreach_mpls_adj_incomplete_next +#undef _ + }, + + .format_trace = format_mpls_output_trace, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (mpls_adj_incomplete_node, + mpls_adj_incomplete) |