/* * 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/bier/bier_imp.h> #include <vnet/bier/bier_hdr_inlines.h> #include <vnet/ip/ip4_inlines.h> #include <vnet/ip/ip6_inlines.h> /** * @brief A struct to hold tracing information for the BIER imposition * node. */ typedef struct bier_imp_trace_t_ { /** * BIER imposition object hit */ index_t imp; /** * BIER hdr applied */ bier_hdr_t hdr; } bier_imp_trace_t; always_inline uword bier_imp_dpo_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, fib_protocol_t fproto, bier_hdr_proto_id_t bproto) { 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) { vlib_buffer_t * b0; bier_imp_t *bimp0; bier_hdr_t *hdr0; u32 bi0, bii0; u32 next0; bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); bii0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX]; bimp0 = bier_imp_get(bii0); if (FIB_PROTOCOL_IP4 == fproto) { /* * decrement the TTL on ingress to the BIER domain */ ip4_header_t * ip0 = vlib_buffer_get_current(b0); u32 checksum0; checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100); checksum0 += checksum0 >= 0xffff; ip0->checksum = checksum0; ip0->ttl -= 1; /* * calculate an entropy */ if (0 == vnet_buffer(b0)->ip.flow_hash) { vnet_buffer(b0)->ip.flow_hash = ip4_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT); } } if (FIB_PROTOCOL_IP6 == fproto) { /* * decrement the TTL on ingress to the BIER domain */ ip6_header_t * ip0 = vlib_buffer_get_current(b0); ip0->hop_limit -= 1; /* * calculate an entropy */ if (0 == vnet_buffer(b0)->ip.flow_hash) { vnet_buffer(b0)->ip.flow_hash = ip6_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT); } } /* Paint the BIER header */ vlib_buffer_advance(b0, -(sizeof(bier_hdr_t) + bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len))); hdr0 = vlib_buffer_get_current(b0); /* RPF check */ if (PREDICT_FALSE(BIER_RX_ITF == vnet_buffer(b0)->ip.adj_index[VLIB_RX])) { next0 = 0; } else { clib_memcpy_fast(hdr0, &bimp0->bi_hdr, (sizeof(bier_hdr_t) + bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len))); /* * Fixup the entropy and protocol, both of which have a * zero value post the paint job */ hdr0->bh_oam_dscp_proto |= clib_host_to_net_u16(bproto << BIER_HDR_PROTO_FIELD_SHIFT); hdr0->bh_first_word |= clib_host_to_net_u32((vnet_buffer(b0)->ip.flow_hash & BIER_HDR_ENTROPY_FIELD_MASK) << BIER_HDR_ENTROPY_FIELD_SHIFT); /* * use TTL 64 for the post encap MPLS label/BIFT-ID * this we be decremented in bier_output node. */ vnet_buffer(b0)->mpls.ttl = 65; /* next node */ next0 = bimp0->bi_dpo[fproto].dpoi_next_node; vnet_buffer(b0)->ip.adj_index[VLIB_TX] = bimp0->bi_dpo[fproto].dpoi_index; } if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) { bier_imp_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); tr->imp = bii0; tr->hdr = *hdr0; } vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return from_frame->n_vectors; } static u8 * format_bier_imp_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 *); bier_imp_trace_t * t; u32 indent; t = va_arg (*args, bier_imp_trace_t *); indent = format_get_indent (s); s = format (s, "%U", format_bier_imp, t->imp, indent, BIER_SHOW_BRIEF); return (s); } VLIB_NODE_FN (bier_imp_ip4_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return (bier_imp_dpo_inline(vm, node, frame, FIB_PROTOCOL_IP4, BIER_HDR_PROTO_IPV4)); } VLIB_REGISTER_NODE (bier_imp_ip4_node) = { .name = "bier-imp-ip4", .vector_size = sizeof (u32), .format_trace = format_bier_imp_trace, .n_next_nodes = 1, .next_nodes = { [0] = "bier-drop", } }; VLIB_NODE_FN (bier_imp_ip6_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return (bier_imp_dpo_inline(vm, node, frame, FIB_PROTOCOL_IP6, BIER_HDR_PROTO_IPV6)); } VLIB_REGISTER_NODE (bier_imp_ip6_node) = { .name = "bier-imp-ip6", .vector_size = sizeof (u32), .format_trace = format_bier_imp_trace, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", } };