2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
18 #include <igmp/igmp_pkt.h>
19 #include <vnet/fib/fib_sas.h>
22 vlib_buffer_append (vlib_buffer_t * b, uword l)
25 b->current_length += l;
28 static vlib_buffer_t *
29 igmp_pkt_get_buffer (igmp_pkt_build_t * bk)
35 vm = vlib_get_main ();
37 if (vlib_buffer_alloc (vm, &bi, 1) != 1)
40 b = vlib_get_buffer (vm, bi);
42 b->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
43 b->flags |= VLIB_BUFFER_IS_TRACED;
45 /* clear out stale data */
46 vnet_buffer (b)->sw_if_index[VLIB_RX] = ~0;
49 * save progress in the builder
51 vec_add1 (bk->buffers, bi);
52 bk->n_avail = vnet_sw_interface_get_mtu (vnet_get_main (),
53 bk->sw_if_index, VNET_MTU_IP4);
58 static vlib_buffer_t *
59 igmp_pkt_build_ip_header (igmp_pkt_build_t * bk,
60 igmp_msg_type_t msg_type,
61 const igmp_group_t * group)
67 b = igmp_pkt_get_buffer (bk);
72 ip4 = vlib_buffer_get_current (b);
73 clib_memset (ip4, 0, sizeof (ip4_header_t));
74 ip4->ip_version_and_header_length = 0x46;
76 ip4->protocol = IP_PROTOCOL_IGMP;
79 fib_sas4_get (bk->sw_if_index, NULL, &ip4->src_address);
81 vlib_buffer_append (b, sizeof (*ip4));
82 bk->n_avail -= sizeof (*ip4);
87 ip4->dst_address.as_u32 = IGMP_MEMBERSHIP_REPORT_ADDRESS;
91 clib_memcpy_fast (&ip4->dst_address, &group->key->ip4,
92 sizeof (ip4_address_t));
94 ip4->dst_address.as_u32 = IGMP_GENERAL_QUERY_ADDRESS;
98 /* add the router alert options */
99 option = vlib_buffer_get_current (b);
100 option[0] = 0x80 | 20; // IP4_ROUTER_ALERT_OPTION;
101 option[1] = 4; // length
102 option[2] = option[3] = 0;
104 vlib_buffer_append (b, 4);
110 static vlib_buffer_t *
111 igmp_pkt_build_report_v3 (igmp_pkt_build_report_t * br,
112 const igmp_group_t * group)
114 igmp_membership_report_v3_t *report;
117 b = igmp_pkt_build_ip_header (&br->base, IGMP_MSG_REPORT, group);
122 report = vlib_buffer_get_current (b);
123 report->header.type = IGMP_TYPE_membership_report_v3;
124 report->header.code = 0;
125 report->header.checksum = 0;
128 vlib_buffer_append (b, sizeof (igmp_membership_report_v3_t));
129 br->base.n_avail -= sizeof (igmp_membership_report_v3_t);
130 br->base.n_bytes += sizeof (igmp_membership_report_v3_t);
136 igmp_pkt_tx (igmp_pkt_build_t * bk)
138 const igmp_config_t *config;
145 vm = vlib_get_main ();
146 config = igmp_config_lookup (bk->sw_if_index);
151 f = vlib_get_frame_to_node (vm, ip4_rewrite_mcast_node.index);
152 to_next = vlib_frame_vector_args (f);
154 vec_foreach_index (ii, bk->buffers)
156 b = vlib_get_buffer (vm, bk->buffers[ii]);
157 vnet_buffer (b)->ip.adj_index[VLIB_TX] = config->adj_index;
158 to_next[ii] = bk->buffers[ii];
162 vlib_put_frame_to_node (vm, ip4_rewrite_mcast_node.index, f);
164 IGMP_DBG (" ..tx: %U", format_vnet_sw_if_index_name,
165 vnet_get_main (), bk->sw_if_index);
167 vec_free (bk->buffers);
171 static vlib_buffer_t *
172 igmp_pkt_build_report_get_active (igmp_pkt_build_report_t * br)
174 if (NULL == br->base.buffers)
177 return (vlib_get_buffer (vlib_get_main (),
178 br->base.buffers[vec_len (br->base.buffers) - 1]));
182 igmp_pkt_build_report_bake (igmp_pkt_build_report_t * br)
184 igmp_membership_report_v3_t *igmp;
188 b = igmp_pkt_build_report_get_active (br);
192 ip4 = vlib_buffer_get_current (b);
193 igmp = (igmp_membership_report_v3_t *) (((u32 *) ip4) + 6);
195 igmp->n_groups = clib_host_to_net_u16 (br->n_groups);
197 igmp->header.checksum =
198 ~ip_csum_fold (ip_incremental_checksum (0, igmp, br->base.n_bytes));
200 ip4->length = clib_host_to_net_u16 (b->current_length);
201 ip4->checksum = ip4_header_checksum (ip4);
203 br->base.n_bytes = br->base.n_avail = br->n_groups = 0;
207 igmp_pkt_report_v3_send (igmp_pkt_build_report_t * br)
209 if (NULL == br->base.buffers)
212 igmp_pkt_build_report_bake (br);
213 igmp_pkt_tx (&br->base);
217 igmp_pkt_report_v3_get_size (const igmp_group_t * group)
219 ASSERT (IGMP_FILTER_MODE_INCLUDE == group->router_filter_mode);
221 return ((hash_elts (group->igmp_src_by_key[IGMP_FILTER_MODE_INCLUDE]) *
222 sizeof (ip4_address_t)) + sizeof (igmp_membership_group_v3_t));
225 static igmp_membership_group_v3_t *
226 igmp_pkt_report_v3_append_group (igmp_pkt_build_report_t * br,
227 const ip46_address_t * grp,
228 igmp_membership_group_v3_type_t type)
230 igmp_membership_group_v3_t *igmp_group;
233 b = igmp_pkt_build_report_get_active (br);
235 if (br->base.n_avail < sizeof (igmp_membership_group_v3_t))
237 igmp_pkt_build_report_bake (br);
238 b = igmp_pkt_build_report_v3 (br, NULL);
242 br->base.n_avail -= sizeof (igmp_membership_group_v3_t);
243 br->base.n_bytes += sizeof (igmp_membership_group_v3_t);
247 igmp_group = vlib_buffer_get_current (b);
248 vlib_buffer_append (b, sizeof (igmp_membership_group_v3_t));
250 igmp_group->type = type;
251 igmp_group->n_aux_u32s = 0;
252 igmp_group->n_src_addresses = 0;
253 igmp_group->group_address.as_u32 = grp->ip4.as_u32;
260 " If the set of Group Records required in a Report does not fit within
261 * the size limit of a single Report message (as determined by the MTU
262 * of the network on which it will be sent), the Group Records are sent
263 * in as many Report messages as needed to report the entire set.
265 * If a single Group Record contains so many source addresses that it
266 * does not fit within the size limit of a single Report message, if its
267 * Type is not MODE_IS_EXCLUDE or CHANGE_TO_EXCLUDE_MODE, it is split
268 * into multiple Group Records, each containing a different subset of
269 * the source addresses and each sent in a separate Report message. If
270 * its Type is MODE_IS_EXCLUDE or CHANGE_TO_EXCLUDE_MODE, a single Group
271 * Record is sent, containing as many source addresses as can fit, and
272 * the remaining source addresses are not reported; though the choice of
273 * which sources to report is arbitrary, it is preferable to report the
274 * same set of sources in each subsequent report, rather than reporting
275 * different sources each time."
277 static igmp_membership_group_v3_t *
278 igmp_pkt_report_v3_append_src (igmp_pkt_build_report_t * br,
279 igmp_membership_group_v3_t * igmp_group,
280 const ip46_address_t * grp,
281 igmp_membership_group_v3_type_t type,
282 const ip46_address_t * src)
286 b = igmp_pkt_build_report_get_active (br);
288 if (br->base.n_avail < sizeof (ip4_address_t))
290 igmp_group->n_src_addresses = clib_host_to_net_u16 (br->n_srcs);
291 igmp_pkt_build_report_bake (br);
292 b = igmp_pkt_build_report_v3 (br, NULL);
295 igmp_group = igmp_pkt_report_v3_append_group (br, grp, type);
298 igmp_group->src_addresses[br->n_srcs].as_u32 = src->ip4.as_u32;
300 br->base.n_avail -= sizeof (ip4_address_t);
301 br->base.n_bytes += sizeof (ip4_address_t);
302 vlib_buffer_append (b, sizeof (ip4_address_t));
308 igmp_pkt_report_v3_add_report (igmp_pkt_build_report_t * br,
309 const ip46_address_t * grp,
310 const ip46_address_t * srcs,
311 igmp_membership_group_v3_type_t type)
313 igmp_membership_group_v3_t *igmp_group;
314 const ip46_address_t *s;
317 b = igmp_pkt_build_report_get_active (br);
321 b = igmp_pkt_build_report_v3 (br, NULL);
323 /* failed to allocate buffer */
327 igmp_group = igmp_pkt_report_v3_append_group (br, grp, type);
329 if (NULL == igmp_group)
334 igmp_group = igmp_pkt_report_v3_append_src(br, igmp_group,
336 if (NULL == igmp_group)
340 igmp_group->n_src_addresses = clib_host_to_net_u16 (br->n_srcs);
342 IGMP_DBG (" ..add-group: %U", format_ip46_address, grp, IP46_TYPE_IP4);
346 igmp_pkt_report_v3_add_group (igmp_pkt_build_report_t * br,
347 const igmp_group_t * group,
348 igmp_membership_group_v3_type_t type)
350 igmp_membership_group_v3_t *igmp_group;
354 b = igmp_pkt_build_report_get_active (br);
358 b = igmp_pkt_build_report_v3 (br, NULL);
360 /* failed to allocate buffer */
365 * if the group won't fit in a partially full buffer, start again
367 if ((0 != br->n_groups) &&
368 (igmp_pkt_report_v3_get_size (group) > br->base.n_avail))
370 igmp_pkt_build_report_bake (br);
371 b = igmp_pkt_build_report_v3 (br, NULL);
373 /* failed to allocate buffer */
377 igmp_group = igmp_pkt_report_v3_append_group (br, group->key, type);
379 FOR_EACH_SRC (src, group, IGMP_FILTER_MODE_INCLUDE,
381 igmp_group = igmp_pkt_report_v3_append_src(br, igmp_group,
384 if (NULL == igmp_group)
387 igmp_group->n_src_addresses = clib_host_to_net_u16 (br->n_srcs);
389 IGMP_DBG (" ..add-group: %U srcs:%d",
390 format_igmp_key, group->key,
391 hash_elts (group->igmp_src_by_key[IGMP_FILTER_MODE_INCLUDE]));
395 igmp_pkt_build_report_init (igmp_pkt_build_report_t * br, u32 sw_if_index)
397 clib_memset (br, 0, sizeof (*br));
398 br->base.sw_if_index = sw_if_index;
401 static vlib_buffer_t *
402 igmp_pkt_build_query_get_active (igmp_pkt_build_query_t * bq)
404 if (NULL == bq->base.buffers)
407 return (vlib_get_buffer (vlib_get_main (),
408 bq->base.buffers[vec_len (bq->base.buffers) - 1]));
411 static vlib_buffer_t *
412 igmp_pkt_build_query_v3 (igmp_pkt_build_query_t * bq,
413 const igmp_group_t * group)
415 igmp_membership_query_v3_t *query;
418 b = igmp_pkt_build_ip_header (&bq->base, IGMP_MSG_QUERY, group);
423 query = vlib_buffer_get_current (b);
424 query->header.type = IGMP_TYPE_membership_query;
425 query->header.code = 0;
426 query->header.checksum = 0;
428 query->resv_s_qrv = 0;
431 query->group_address.as_u32 = group->key->ip4.as_u32;
433 query->group_address.as_u32 = 0;
435 vlib_buffer_append (b, sizeof (igmp_membership_query_v3_t));
436 bq->base.n_avail -= sizeof (igmp_membership_query_v3_t);
437 bq->base.n_bytes += sizeof (igmp_membership_query_v3_t);
443 igmp_pkt_query_v3_add_group (igmp_pkt_build_query_t * bq,
444 const igmp_group_t * group,
445 const ip46_address_t * srcs)
449 b = igmp_pkt_build_query_get_active (bq);
453 b = igmp_pkt_build_query_v3 (bq, group);
455 /* failed to allocate buffer */
461 igmp_membership_query_v3_t *query;
462 const ip46_address_t *src;
464 query = vlib_buffer_get_current (b);
466 vec_foreach (src, srcs)
468 query->src_addresses[bq->n_srcs++].as_u32 = src->ip4.as_u32;
470 vlib_buffer_append (b, sizeof (ip4_address_t));
471 bq->base.n_bytes += sizeof (ip4_address_t);
472 bq->base.n_avail += sizeof (ip4_address_t);
477 * general query and we're done
482 igmp_pkt_build_query_bake (igmp_pkt_build_query_t * bq)
484 igmp_membership_query_v3_t *igmp;
488 b = igmp_pkt_build_query_get_active (bq);
492 ip4 = vlib_buffer_get_current (b);
493 // account for options
494 igmp = (igmp_membership_query_v3_t *) (((u32 *) ip4) + 6);
496 igmp->n_src_addresses = clib_host_to_net_u16 (bq->n_srcs);
498 igmp->header.checksum =
499 ~ip_csum_fold (ip_incremental_checksum (0, igmp, bq->base.n_bytes));
501 ip4->length = clib_host_to_net_u16 (b->current_length);
502 ip4->checksum = ip4_header_checksum (ip4);
504 bq->base.n_bytes = bq->base.n_avail = bq->n_srcs = 0;
508 igmp_pkt_query_v3_send (igmp_pkt_build_query_t * bq)
510 if (NULL == bq->base.buffers)
513 igmp_pkt_build_query_bake (bq);
514 igmp_pkt_tx (&bq->base);
518 igmp_pkt_build_query_init (igmp_pkt_build_query_t * bq, u32 sw_if_index)
520 clib_memset (bq, 0, sizeof (*bq));
521 bq->base.sw_if_index = sw_if_index;
525 * fd.io coding-style-patch-verification: ON
528 * eval: (c-set-style "gnu")