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Neale Rannsd792d9c2017-10-21 10:53:20 -07001/*
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:
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
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.
14 */
15
16#include <vnet/bier/bier_imp.h>
17#include <vnet/bier/bier_hdr_inlines.h>
18#include <vnet/ip/ip.h>
19
20/**
21 * @brief A struct to hold tracing information for the BIER imposition
22 * node.
23 */
24typedef struct bier_imp_trace_t_
25{
26 /**
27 * BIER imposition object hit
28 */
29 index_t imp;
30
31 /**
32 * BIER hdr applied
33 */
34 bier_hdr_t hdr;
35} bier_imp_trace_t;
36
37always_inline uword
38bier_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)
43{
44 u32 n_left_from, next_index, * from, * to_next;
45
46 from = vlib_frame_vector_args (from_frame);
47 n_left_from = from_frame->n_vectors;
48
49 next_index = node->cached_next_index;
50
51 while (n_left_from > 0)
52 {
53 u32 n_left_to_next;
54
55 vlib_get_next_frame(vm, node, next_index, to_next, n_left_to_next);
56
57 while (n_left_from > 0 && n_left_to_next > 0)
58 {
59 vlib_buffer_t * b0;
60 bier_imp_t *bimp0;
61 bier_hdr_t *hdr0;
62 u32 bi0, bii0;
63 u32 next0;
64
65 bi0 = from[0];
66 to_next[0] = bi0;
67 from += 1;
68 to_next += 1;
69 n_left_from -= 1;
70 n_left_to_next -= 1;
71
72 b0 = vlib_get_buffer (vm, bi0);
73
74 bii0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
75 bimp0 = bier_imp_get(bii0);
76
77 if (FIB_PROTOCOL_IP4 == fproto)
78 {
79 /*
80 * decrement the TTL on ingress to the BIER domain
81 */
82 ip4_header_t * ip0 = vlib_buffer_get_current(b0);
83 u32 checksum0;
84
85 checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
86 checksum0 += checksum0 >= 0xffff;
87
88 ip0->checksum = checksum0;
89 ip0->ttl -= 1;
90
91 /*
92 * calculate an entropy
93 */
94 if (0 == vnet_buffer(b0)->ip.flow_hash)
95 {
96 vnet_buffer(b0)->ip.flow_hash =
97 ip4_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
98 }
99 }
100 if (FIB_PROTOCOL_IP6 == fproto)
101 {
102 /*
103 * decrement the TTL on ingress to the BIER domain
104 */
105 ip6_header_t * ip0 = vlib_buffer_get_current(b0);
106
107 ip0->hop_limit -= 1;
108
109 /*
110 * calculate an entropy
111 */
112 if (0 == vnet_buffer(b0)->ip.flow_hash)
113 {
114 vnet_buffer(b0)->ip.flow_hash =
115 ip6_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
116 }
117 }
118
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);
Neale Rannsd792d9c2017-10-21 10:53:20 -0700123
Neale Rannsfe4e48f2018-09-24 23:38:37 -0700124 /* RPF check */
125 if (PREDICT_FALSE(BIER_RX_ITF == vnet_buffer(b0)->ip.adj_index[VLIB_RX]))
126 {
127 next0 = 0;
128 }
129 else
130 {
Dave Barach178cf492018-11-13 16:34:13 -0500131 clib_memcpy_fast(hdr0, &bimp0->bi_hdr,
Neale Rannsfe4e48f2018-09-24 23:38:37 -0700132 (sizeof(bier_hdr_t) +
133 bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
134 /*
135 * Fixup the entropy and protocol, both of which have a
136 * zero value post the paint job
137 */
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);
Neale Ranns91286372017-12-05 13:24:04 -0800144
Neale Rannsfe4e48f2018-09-24 23:38:37 -0700145 /*
146 * use TTL 64 for the post enacp MPLS label/BIFT-ID
147 * this we be decremeted in bier_output node.
148 */
149 vnet_buffer(b0)->mpls.ttl = 65;
150
151 /* next node */
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;
155 }
Neale Rannsd792d9c2017-10-21 10:53:20 -0700156
157 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
158 {
159 bier_imp_trace_t *tr =
160 vlib_add_trace (vm, node, b0, sizeof (*tr));
161 tr->imp = bii0;
162 tr->hdr = *hdr0;
163 }
164
165 vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next,
166 n_left_to_next, bi0, next0);
167 }
168 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
169 }
170 return from_frame->n_vectors;
171}
172
173static u8 *
174format_bier_imp_trace (u8 * s, va_list * args)
175{
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;
179 u32 indent;
180
181 t = va_arg (*args, bier_imp_trace_t *);
182 indent = format_get_indent (s);
183
184 s = format (s, "%U", format_bier_imp, t->imp, indent, BIER_SHOW_BRIEF);
185 return (s);
186}
187
Filip Tehlara01e0322019-03-05 03:34:52 -0800188VLIB_NODE_FN (bier_imp_ip4_node) (vlib_main_t * vm,
Neale Rannsd792d9c2017-10-21 10:53:20 -0700189 vlib_node_runtime_t * node,
190 vlib_frame_t * frame)
191{
192 return (bier_imp_dpo_inline(vm, node, frame,
193 FIB_PROTOCOL_IP4,
194 BIER_HDR_PROTO_IPV4));
195}
196
197VLIB_REGISTER_NODE (bier_imp_ip4_node) = {
Neale Rannsd792d9c2017-10-21 10:53:20 -0700198 .name = "bier-imp-ip4",
199 .vector_size = sizeof (u32),
200
201 .format_trace = format_bier_imp_trace,
202 .n_next_nodes = 1,
203 .next_nodes = {
Neale Rannsfe4e48f2018-09-24 23:38:37 -0700204 [0] = "bier-drop",
Neale Rannsd792d9c2017-10-21 10:53:20 -0700205 }
206};
Neale Rannsd792d9c2017-10-21 10:53:20 -0700207
Filip Tehlara01e0322019-03-05 03:34:52 -0800208VLIB_NODE_FN (bier_imp_ip6_node) (vlib_main_t * vm,
Neale Rannsd792d9c2017-10-21 10:53:20 -0700209 vlib_node_runtime_t * node,
210 vlib_frame_t * frame)
211{
212 return (bier_imp_dpo_inline(vm, node, frame,
213 FIB_PROTOCOL_IP6,
214 BIER_HDR_PROTO_IPV6));
215}
216
217VLIB_REGISTER_NODE (bier_imp_ip6_node) = {
Neale Rannsd792d9c2017-10-21 10:53:20 -0700218 .name = "bier-imp-ip6",
219 .vector_size = sizeof (u32),
220
221 .format_trace = format_bier_imp_trace,
222 .n_next_nodes = 1,
223 .next_nodes = {
224 [0] = "error-drop",
225 }
226};