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Diffstat (limited to 'src/vnet/adj/adj_l2.c')
| -rw-r--r-- | src/vnet/adj/adj_l2.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/src/vnet/adj/adj_l2.c b/src/vnet/adj/adj_l2.c new file mode 100644 index 00000000000..4d2dd7082f1 --- /dev/null +++ b/src/vnet/adj/adj_l2.c @@ -0,0 +1,194 @@ +/* + * Copyright (c) 2016 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 <vnet/vnet.h> +#include <vnet/adj/adj_l2.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/ip/ip.h> + +/** + * @brief Trace data for a L2 Midchain + */ +typedef struct adj_l2_trace_t_ { + /** Adjacency index taken. */ + u32 adj_index; +} adj_l2_trace_t; + +static u8 * +format_adj_l2_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 *); + adj_l2_trace_t * t = va_arg (*args, adj_l2_trace_t *); + + s = format (s, "adj-idx %d : %U", + t->adj_index, + format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE); + return s; +} + +typedef enum adj_l2_rewrite_next_t_ +{ + ADJ_L2_REWRITE_NEXT_DROP, +} adj_l2_rewrite_next_t; + +always_inline uword +adj_l2_rewrite_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, + int is_midchain) +{ + u32 * from = vlib_frame_vector_args (frame); + u32 n_left_from, n_left_to_next, * to_next, next_index; + u32 cpu_index = os_get_cpu_number(); + ethernet_main_t * em = ðernet_main; + + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + 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; + vlib_buffer_t * p0; + char *h0; + u32 pi0, rw_len0, adj_index0, next0 = 0; + u32 tx_sw_if_index0; + + pi0 = to_next[0] = from[0]; + from += 1; + n_left_from -= 1; + to_next += 1; + n_left_to_next -= 1; + + p0 = vlib_get_buffer (vm, pi0); + h0 = vlib_buffer_get_current (p0); + + 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); + + /* Guess we are only writing on simple Ethernet header. */ + vnet_rewrite_one_header (adj0[0], h0, + sizeof (ethernet_header_t)); + + /* Update packet buffer attributes/set output interface. */ + rw_len0 = adj0[0].rewrite_header.data_bytes; + vnet_buffer(p0)->ip.save_rewrite_length = rw_len0; + + 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. */ + if (PREDICT_TRUE((vlib_buffer_length_in_chain (vm, p0) <= + adj0[0].rewrite_header.max_l3_packet_bytes))) + { + /* Don't adjust the buffer for ttl issue; icmp-error node wants + * to see the IP headerr */ + p0->current_data -= rw_len0; + p0->current_length += rw_len0; + tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index; + + if (is_midchain) + { + adj0->sub_type.midchain.fixup_func(vm, adj0, p0); + } + + vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0; + + /* + * Follow the feature ARC. this will result eventually in + * the midchain-tx node + */ + vnet_feature_arc_start(em->output_feature_arc_index, tx_sw_if_index0, &next0, p0); + } + else + { + /* can't fragment L2 */ + next0 = ADJ_L2_REWRITE_NEXT_DROP; + } + + if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED)) + { + adj_l2_trace_t *tr = vlib_add_trace (vm, node, + p0, sizeof (*tr)); + tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX]; + } + + 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 frame->n_vectors; +} + +static uword +adj_l2_rewrite (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return adj_l2_rewrite_inline (vm, node, frame, 0); +} + +static uword +adj_l2_midchain (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return adj_l2_rewrite_inline (vm, node, frame, 1); +} + +VLIB_REGISTER_NODE (adj_l2_rewrite_node) = { + .function = adj_l2_rewrite, + .name = "adj-l2-rewrite", + .vector_size = sizeof (u32), + + .format_trace = format_adj_l2_trace, + + .n_next_nodes = 1, + .next_nodes = { + [ADJ_L2_REWRITE_NEXT_DROP] = "error-drop", + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (adj_l2_rewrite_node, adj_l2_rewrite) + +VLIB_REGISTER_NODE (adj_l2_midchain_node) = { + .function = adj_l2_midchain, + .name = "adj-l2-midchain", + .vector_size = sizeof (u32), + + .format_trace = format_adj_l2_trace, + + .n_next_nodes = 1, + .next_nodes = { + [ADJ_L2_REWRITE_NEXT_DROP] = "error-drop", + }, +}; + +VLIB_NODE_FUNCTION_MULTIARCH (adj_l2_midchain_node, adj_l2_midchain) |