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/ip.h>
21 * @brief A struct to hold tracing information for the BIER imposition
24 typedef struct bier_imp_trace_t_
27 * BIER imposition object hit
38 bier_imp_dpo_inline (vlib_main_t * vm,
39 vlib_node_runtime_t * node,
40 vlib_frame_t * from_frame,
41 fib_protocol_t fproto,
42 bier_hdr_proto_id_t bproto)
44 u32 n_left_from, next_index, * from, * to_next;
46 from = vlib_frame_vector_args (from_frame);
47 n_left_from = from_frame->n_vectors;
49 next_index = node->cached_next_index;
51 while (n_left_from > 0)
55 vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
57 while (n_left_from > 0 && n_left_to_next > 0)
72 b0 = vlib_get_buffer (vm, bi0);
74 bii0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
75 bimp0 = bier_imp_get(bii0);
77 if (FIB_PROTOCOL_IP4 == fproto)
80 * decrement the TTL on ingress to the BIER domain
82 ip4_header_t * ip0 = vlib_buffer_get_current(b0);
85 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
86 checksum0 += checksum0 >= 0xffff;
88 ip0->checksum = checksum0;
92 * calculate an entropy
94 if (0 == vnet_buffer(b0)->ip.flow_hash)
96 vnet_buffer(b0)->ip.flow_hash =
97 ip4_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
100 if (FIB_PROTOCOL_IP6 == fproto)
103 * decrement the TTL on ingress to the BIER domain
105 ip6_header_t * ip0 = vlib_buffer_get_current(b0);
110 * calculate an entropy
112 if (0 == vnet_buffer(b0)->ip.flow_hash)
114 vnet_buffer(b0)->ip.flow_hash =
115 ip6_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
119 /* Paint the BIER header */
120 vlib_buffer_advance(b0, -(sizeof(bier_hdr_t) +
121 bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
122 hdr0 = vlib_buffer_get_current(b0);
125 if (PREDICT_FALSE(BIER_RX_ITF == vnet_buffer(b0)->ip.adj_index[VLIB_RX]))
131 clib_memcpy(hdr0, &bimp0->bi_hdr,
132 (sizeof(bier_hdr_t) +
133 bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
135 * Fixup the entropy and protocol, both of which have a
136 * zero value post the paint job
138 hdr0->bh_oam_dscp_proto |=
139 clib_host_to_net_u16(bproto << BIER_HDR_PROTO_FIELD_SHIFT);
140 hdr0->bh_first_word |=
141 clib_host_to_net_u32((vnet_buffer(b0)->ip.flow_hash &
142 BIER_HDR_ENTROPY_FIELD_MASK) <<
143 BIER_HDR_ENTROPY_FIELD_SHIFT);
146 * use TTL 64 for the post enacp MPLS label/BIFT-ID
147 * this we be decremeted in bier_output node.
149 vnet_buffer(b0)->mpls.ttl = 65;
152 next0 = bimp0->bi_dpo[fproto].dpoi_next_node;
153 vnet_buffer(b0)->ip.adj_index[VLIB_TX] =
154 bimp0->bi_dpo[fproto].dpoi_index;
157 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
159 bier_imp_trace_t *tr =
160 vlib_add_trace (vm, node, b0, sizeof (*tr));
165 vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
166 n_left_to_next, bi0, next0);
168 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
170 return from_frame->n_vectors;
174 format_bier_imp_trace (u8 * s, va_list * args)
176 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
177 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
178 bier_imp_trace_t * t;
181 t = va_arg (*args, bier_imp_trace_t *);
182 indent = format_get_indent (s);
184 s = format (s, "%U", format_bier_imp, t->imp, indent, BIER_SHOW_BRIEF);
189 bier_imp_ip4 (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 .function = bier_imp_ip4,
200 .name = "bier-imp-ip4",
201 .vector_size = sizeof (u32),
203 .format_trace = format_bier_imp_trace,
209 VLIB_NODE_FUNCTION_MULTIARCH (bier_imp_ip4_node, bier_imp_ip4)
212 bier_imp_ip6 (vlib_main_t * vm,
213 vlib_node_runtime_t * node,
214 vlib_frame_t * frame)
216 return (bier_imp_dpo_inline(vm, node, frame,
218 BIER_HDR_PROTO_IPV6));
221 VLIB_REGISTER_NODE (bier_imp_ip6_node) = {
222 .function = bier_imp_ip6,
223 .name = "bier-imp-ip6",
224 .vector_size = sizeof (u32),
226 .format_trace = format_bier_imp_trace,
232 VLIB_NODE_FUNCTION_MULTIARCH (bier_imp_ip6_node, bier_imp_ip6)