2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <vnet/bier/bier_imp.h>
17 #include <vnet/bier/bier_hdr_inlines.h>
18 #include <vnet/ip/ip4_inlines.h>
19 #include <vnet/ip/ip6_inlines.h>
22 * @brief A struct to hold tracing information for the BIER imposition
25 typedef struct bier_imp_trace_t_
28 * BIER imposition object hit
39 bier_imp_dpo_inline (vlib_main_t * vm,
40 vlib_node_runtime_t * node,
41 vlib_frame_t * from_frame,
42 fib_protocol_t fproto,
43 bier_hdr_proto_id_t bproto)
45 u32 n_left_from, next_index, * from, * to_next;
47 from = vlib_frame_vector_args (from_frame);
48 n_left_from = from_frame->n_vectors;
50 next_index = node->cached_next_index;
52 while (n_left_from > 0)
56 vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
58 while (n_left_from > 0 && n_left_to_next > 0)
73 b0 = vlib_get_buffer (vm, bi0);
75 bii0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
76 bimp0 = bier_imp_get(bii0);
78 if (FIB_PROTOCOL_IP4 == fproto)
81 * decrement the TTL on ingress to the BIER domain
83 ip4_header_t * ip0 = vlib_buffer_get_current(b0);
86 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
87 checksum0 += checksum0 >= 0xffff;
89 ip0->checksum = checksum0;
93 * calculate an entropy
95 if (0 == vnet_buffer(b0)->ip.flow_hash)
97 vnet_buffer(b0)->ip.flow_hash =
98 ip4_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
101 if (FIB_PROTOCOL_IP6 == fproto)
104 * decrement the TTL on ingress to the BIER domain
106 ip6_header_t * ip0 = vlib_buffer_get_current(b0);
111 * calculate an entropy
113 if (0 == vnet_buffer(b0)->ip.flow_hash)
115 vnet_buffer(b0)->ip.flow_hash =
116 ip6_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
120 /* Paint the BIER header */
121 vlib_buffer_advance(b0, -(sizeof(bier_hdr_t) +
122 bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
123 hdr0 = vlib_buffer_get_current(b0);
126 if (PREDICT_FALSE(BIER_RX_ITF == vnet_buffer(b0)->ip.adj_index[VLIB_RX]))
132 clib_memcpy_fast(hdr0, &bimp0->bi_hdr,
133 (sizeof(bier_hdr_t) +
134 bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
136 * Fixup the entropy and protocol, both of which have a
137 * zero value post the paint job
139 hdr0->bh_oam_dscp_proto |=
140 clib_host_to_net_u16(bproto << BIER_HDR_PROTO_FIELD_SHIFT);
141 hdr0->bh_first_word |=
142 clib_host_to_net_u32((vnet_buffer(b0)->ip.flow_hash &
143 BIER_HDR_ENTROPY_FIELD_MASK) <<
144 BIER_HDR_ENTROPY_FIELD_SHIFT);
147 * use TTL 64 for the post encap MPLS label/BIFT-ID
148 * this we be decremented in bier_output node.
150 vnet_buffer(b0)->mpls.ttl = 65;
153 next0 = bimp0->bi_dpo[fproto].dpoi_next_node;
154 vnet_buffer(b0)->ip.adj_index[VLIB_TX] =
155 bimp0->bi_dpo[fproto].dpoi_index;
158 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
160 bier_imp_trace_t *tr =
161 vlib_add_trace (vm, node, b0, sizeof (*tr));
166 vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
167 n_left_to_next, bi0, next0);
169 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
171 return from_frame->n_vectors;
175 format_bier_imp_trace (u8 * s, va_list * args)
177 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
178 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
179 bier_imp_trace_t * t;
182 t = va_arg (*args, bier_imp_trace_t *);
183 indent = format_get_indent (s);
185 s = format (s, "%U", format_bier_imp, t->imp, indent, BIER_SHOW_BRIEF);
189 VLIB_NODE_FN (bier_imp_ip4_node) (vlib_main_t * vm,
190 vlib_node_runtime_t * node,
191 vlib_frame_t * frame)
193 return (bier_imp_dpo_inline(vm, node, frame,
195 BIER_HDR_PROTO_IPV4));
198 VLIB_REGISTER_NODE (bier_imp_ip4_node) = {
199 .name = "bier-imp-ip4",
200 .vector_size = sizeof (u32),
202 .format_trace = format_bier_imp_trace,
209 VLIB_NODE_FN (bier_imp_ip6_node) (vlib_main_t * vm,
210 vlib_node_runtime_t * node,
211 vlib_frame_t * frame)
213 return (bier_imp_dpo_inline(vm, node, frame,
215 BIER_HDR_PROTO_IPV6));
218 VLIB_REGISTER_NODE (bier_imp_ip6_node) = {
219 .name = "bier-imp-ip6",
220 .vector_size = sizeof (u32),
222 .format_trace = format_bier_imp_trace,