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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6ae0a628 YG |
2 | /* |
3 | * net/psample/psample.c - Netlink channel for packet sampling | |
4 | * Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com> | |
6ae0a628 YG |
5 | */ |
6 | ||
7 | #include <linux/types.h> | |
8 | #include <linux/kernel.h> | |
9 | #include <linux/skbuff.h> | |
10 | #include <linux/module.h> | |
07e1a580 | 11 | #include <linux/timekeeping.h> |
6ae0a628 YG |
12 | #include <net/net_namespace.h> |
13 | #include <net/sock.h> | |
14 | #include <net/netlink.h> | |
15 | #include <net/genetlink.h> | |
16 | #include <net/psample.h> | |
17 | #include <linux/spinlock.h> | |
d8bed686 CM |
18 | #include <net/ip_tunnels.h> |
19 | #include <net/dst_metadata.h> | |
6ae0a628 YG |
20 | |
21 | #define PSAMPLE_MAX_PACKET_SIZE 0xffff | |
22 | ||
23 | static LIST_HEAD(psample_groups_list); | |
24 | static DEFINE_SPINLOCK(psample_groups_lock); | |
25 | ||
26 | /* multicast groups */ | |
27 | enum psample_nl_multicast_groups { | |
28 | PSAMPLE_NL_MCGRP_CONFIG, | |
29 | PSAMPLE_NL_MCGRP_SAMPLE, | |
30 | }; | |
31 | ||
32 | static const struct genl_multicast_group psample_nl_mcgrps[] = { | |
33 | [PSAMPLE_NL_MCGRP_CONFIG] = { .name = PSAMPLE_NL_MCGRP_CONFIG_NAME }, | |
34 | [PSAMPLE_NL_MCGRP_SAMPLE] = { .name = PSAMPLE_NL_MCGRP_SAMPLE_NAME }, | |
35 | }; | |
36 | ||
37 | static struct genl_family psample_nl_family __ro_after_init; | |
38 | ||
39 | static int psample_group_nl_fill(struct sk_buff *msg, | |
40 | struct psample_group *group, | |
41 | enum psample_command cmd, u32 portid, u32 seq, | |
42 | int flags) | |
43 | { | |
44 | void *hdr; | |
45 | int ret; | |
46 | ||
47 | hdr = genlmsg_put(msg, portid, seq, &psample_nl_family, flags, cmd); | |
48 | if (!hdr) | |
49 | return -EMSGSIZE; | |
50 | ||
51 | ret = nla_put_u32(msg, PSAMPLE_ATTR_SAMPLE_GROUP, group->group_num); | |
52 | if (ret < 0) | |
53 | goto error; | |
54 | ||
55 | ret = nla_put_u32(msg, PSAMPLE_ATTR_GROUP_REFCOUNT, group->refcount); | |
56 | if (ret < 0) | |
57 | goto error; | |
58 | ||
59 | ret = nla_put_u32(msg, PSAMPLE_ATTR_GROUP_SEQ, group->seq); | |
60 | if (ret < 0) | |
61 | goto error; | |
62 | ||
63 | genlmsg_end(msg, hdr); | |
64 | return 0; | |
65 | ||
66 | error: | |
67 | genlmsg_cancel(msg, hdr); | |
68 | return -EMSGSIZE; | |
69 | } | |
70 | ||
71 | static int psample_nl_cmd_get_group_dumpit(struct sk_buff *msg, | |
72 | struct netlink_callback *cb) | |
73 | { | |
74 | struct psample_group *group; | |
75 | int start = cb->args[0]; | |
76 | int idx = 0; | |
77 | int err; | |
78 | ||
4a5da47d | 79 | spin_lock_bh(&psample_groups_lock); |
6ae0a628 YG |
80 | list_for_each_entry(group, &psample_groups_list, list) { |
81 | if (!net_eq(group->net, sock_net(msg->sk))) | |
82 | continue; | |
83 | if (idx < start) { | |
84 | idx++; | |
85 | continue; | |
86 | } | |
87 | err = psample_group_nl_fill(msg, group, PSAMPLE_CMD_NEW_GROUP, | |
88 | NETLINK_CB(cb->skb).portid, | |
89 | cb->nlh->nlmsg_seq, NLM_F_MULTI); | |
90 | if (err) | |
91 | break; | |
92 | idx++; | |
93 | } | |
94 | ||
4a5da47d | 95 | spin_unlock_bh(&psample_groups_lock); |
6ae0a628 YG |
96 | cb->args[0] = idx; |
97 | return msg->len; | |
98 | } | |
99 | ||
66a9b928 | 100 | static const struct genl_small_ops psample_nl_ops[] = { |
6ae0a628 YG |
101 | { |
102 | .cmd = PSAMPLE_CMD_GET_GROUP, | |
ef6243ac | 103 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
6ae0a628 YG |
104 | .dumpit = psample_nl_cmd_get_group_dumpit, |
105 | /* can be retrieved by unprivileged users */ | |
106 | } | |
107 | }; | |
108 | ||
109 | static struct genl_family psample_nl_family __ro_after_init = { | |
110 | .name = PSAMPLE_GENL_NAME, | |
111 | .version = PSAMPLE_GENL_VERSION, | |
112 | .maxattr = PSAMPLE_ATTR_MAX, | |
113 | .netnsok = true, | |
114 | .module = THIS_MODULE, | |
115 | .mcgrps = psample_nl_mcgrps, | |
66a9b928 JK |
116 | .small_ops = psample_nl_ops, |
117 | .n_small_ops = ARRAY_SIZE(psample_nl_ops), | |
6ae0a628 YG |
118 | .n_mcgrps = ARRAY_SIZE(psample_nl_mcgrps), |
119 | }; | |
120 | ||
121 | static void psample_group_notify(struct psample_group *group, | |
122 | enum psample_command cmd) | |
123 | { | |
124 | struct sk_buff *msg; | |
125 | int err; | |
126 | ||
127 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); | |
128 | if (!msg) | |
129 | return; | |
130 | ||
131 | err = psample_group_nl_fill(msg, group, cmd, 0, 0, NLM_F_MULTI); | |
132 | if (!err) | |
133 | genlmsg_multicast_netns(&psample_nl_family, group->net, msg, 0, | |
134 | PSAMPLE_NL_MCGRP_CONFIG, GFP_ATOMIC); | |
135 | else | |
136 | nlmsg_free(msg); | |
137 | } | |
138 | ||
139 | static struct psample_group *psample_group_create(struct net *net, | |
140 | u32 group_num) | |
141 | { | |
142 | struct psample_group *group; | |
143 | ||
144 | group = kzalloc(sizeof(*group), GFP_ATOMIC); | |
145 | if (!group) | |
146 | return NULL; | |
147 | ||
148 | group->net = net; | |
149 | group->group_num = group_num; | |
150 | list_add_tail(&group->list, &psample_groups_list); | |
151 | ||
152 | psample_group_notify(group, PSAMPLE_CMD_NEW_GROUP); | |
153 | return group; | |
154 | } | |
155 | ||
156 | static void psample_group_destroy(struct psample_group *group) | |
157 | { | |
158 | psample_group_notify(group, PSAMPLE_CMD_DEL_GROUP); | |
159 | list_del(&group->list); | |
dbf47a2a | 160 | kfree_rcu(group, rcu); |
6ae0a628 YG |
161 | } |
162 | ||
163 | static struct psample_group * | |
164 | psample_group_lookup(struct net *net, u32 group_num) | |
165 | { | |
166 | struct psample_group *group; | |
167 | ||
168 | list_for_each_entry(group, &psample_groups_list, list) | |
169 | if ((group->group_num == group_num) && (group->net == net)) | |
170 | return group; | |
171 | return NULL; | |
172 | } | |
173 | ||
174 | struct psample_group *psample_group_get(struct net *net, u32 group_num) | |
175 | { | |
176 | struct psample_group *group; | |
177 | ||
4a5da47d | 178 | spin_lock_bh(&psample_groups_lock); |
6ae0a628 YG |
179 | |
180 | group = psample_group_lookup(net, group_num); | |
181 | if (!group) { | |
182 | group = psample_group_create(net, group_num); | |
183 | if (!group) | |
184 | goto out; | |
185 | } | |
186 | group->refcount++; | |
187 | ||
188 | out: | |
4a5da47d | 189 | spin_unlock_bh(&psample_groups_lock); |
6ae0a628 YG |
190 | return group; |
191 | } | |
192 | EXPORT_SYMBOL_GPL(psample_group_get); | |
193 | ||
4a5da47d VB |
194 | void psample_group_take(struct psample_group *group) |
195 | { | |
196 | spin_lock_bh(&psample_groups_lock); | |
197 | group->refcount++; | |
198 | spin_unlock_bh(&psample_groups_lock); | |
199 | } | |
200 | EXPORT_SYMBOL_GPL(psample_group_take); | |
201 | ||
6ae0a628 YG |
202 | void psample_group_put(struct psample_group *group) |
203 | { | |
4a5da47d | 204 | spin_lock_bh(&psample_groups_lock); |
6ae0a628 YG |
205 | |
206 | if (--group->refcount == 0) | |
207 | psample_group_destroy(group); | |
208 | ||
4a5da47d | 209 | spin_unlock_bh(&psample_groups_lock); |
6ae0a628 YG |
210 | } |
211 | EXPORT_SYMBOL_GPL(psample_group_put); | |
212 | ||
07a7f308 | 213 | #ifdef CONFIG_INET |
d8bed686 CM |
214 | static int __psample_ip_tun_to_nlattr(struct sk_buff *skb, |
215 | struct ip_tunnel_info *tun_info) | |
216 | { | |
217 | unsigned short tun_proto = ip_tunnel_info_af(tun_info); | |
218 | const void *tun_opts = ip_tunnel_info_opts(tun_info); | |
219 | const struct ip_tunnel_key *tun_key = &tun_info->key; | |
220 | int tun_opts_len = tun_info->options_len; | |
221 | ||
222 | if (tun_key->tun_flags & TUNNEL_KEY && | |
223 | nla_put_be64(skb, PSAMPLE_TUNNEL_KEY_ATTR_ID, tun_key->tun_id, | |
224 | PSAMPLE_TUNNEL_KEY_ATTR_PAD)) | |
225 | return -EMSGSIZE; | |
226 | ||
227 | if (tun_info->mode & IP_TUNNEL_INFO_BRIDGE && | |
228 | nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV4_INFO_BRIDGE)) | |
229 | return -EMSGSIZE; | |
230 | ||
231 | switch (tun_proto) { | |
232 | case AF_INET: | |
233 | if (tun_key->u.ipv4.src && | |
234 | nla_put_in_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV4_SRC, | |
235 | tun_key->u.ipv4.src)) | |
236 | return -EMSGSIZE; | |
237 | if (tun_key->u.ipv4.dst && | |
238 | nla_put_in_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV4_DST, | |
239 | tun_key->u.ipv4.dst)) | |
240 | return -EMSGSIZE; | |
241 | break; | |
242 | case AF_INET6: | |
243 | if (!ipv6_addr_any(&tun_key->u.ipv6.src) && | |
244 | nla_put_in6_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV6_SRC, | |
245 | &tun_key->u.ipv6.src)) | |
246 | return -EMSGSIZE; | |
247 | if (!ipv6_addr_any(&tun_key->u.ipv6.dst) && | |
248 | nla_put_in6_addr(skb, PSAMPLE_TUNNEL_KEY_ATTR_IPV6_DST, | |
249 | &tun_key->u.ipv6.dst)) | |
250 | return -EMSGSIZE; | |
251 | break; | |
252 | } | |
253 | if (tun_key->tos && | |
254 | nla_put_u8(skb, PSAMPLE_TUNNEL_KEY_ATTR_TOS, tun_key->tos)) | |
255 | return -EMSGSIZE; | |
256 | if (nla_put_u8(skb, PSAMPLE_TUNNEL_KEY_ATTR_TTL, tun_key->ttl)) | |
257 | return -EMSGSIZE; | |
258 | if ((tun_key->tun_flags & TUNNEL_DONT_FRAGMENT) && | |
259 | nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_DONT_FRAGMENT)) | |
260 | return -EMSGSIZE; | |
261 | if ((tun_key->tun_flags & TUNNEL_CSUM) && | |
262 | nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_CSUM)) | |
263 | return -EMSGSIZE; | |
264 | if (tun_key->tp_src && | |
265 | nla_put_be16(skb, PSAMPLE_TUNNEL_KEY_ATTR_TP_SRC, tun_key->tp_src)) | |
266 | return -EMSGSIZE; | |
267 | if (tun_key->tp_dst && | |
268 | nla_put_be16(skb, PSAMPLE_TUNNEL_KEY_ATTR_TP_DST, tun_key->tp_dst)) | |
269 | return -EMSGSIZE; | |
270 | if ((tun_key->tun_flags & TUNNEL_OAM) && | |
271 | nla_put_flag(skb, PSAMPLE_TUNNEL_KEY_ATTR_OAM)) | |
272 | return -EMSGSIZE; | |
273 | if (tun_opts_len) { | |
274 | if (tun_key->tun_flags & TUNNEL_GENEVE_OPT && | |
275 | nla_put(skb, PSAMPLE_TUNNEL_KEY_ATTR_GENEVE_OPTS, | |
276 | tun_opts_len, tun_opts)) | |
277 | return -EMSGSIZE; | |
278 | else if (tun_key->tun_flags & TUNNEL_ERSPAN_OPT && | |
279 | nla_put(skb, PSAMPLE_TUNNEL_KEY_ATTR_ERSPAN_OPTS, | |
280 | tun_opts_len, tun_opts)) | |
281 | return -EMSGSIZE; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static int psample_ip_tun_to_nlattr(struct sk_buff *skb, | |
288 | struct ip_tunnel_info *tun_info) | |
289 | { | |
290 | struct nlattr *nla; | |
291 | int err; | |
292 | ||
293 | nla = nla_nest_start_noflag(skb, PSAMPLE_ATTR_TUNNEL); | |
294 | if (!nla) | |
295 | return -EMSGSIZE; | |
296 | ||
297 | err = __psample_ip_tun_to_nlattr(skb, tun_info); | |
298 | if (err) { | |
299 | nla_nest_cancel(skb, nla); | |
300 | return err; | |
301 | } | |
302 | ||
303 | nla_nest_end(skb, nla); | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | static int psample_tunnel_meta_len(struct ip_tunnel_info *tun_info) | |
309 | { | |
310 | unsigned short tun_proto = ip_tunnel_info_af(tun_info); | |
311 | const struct ip_tunnel_key *tun_key = &tun_info->key; | |
312 | int tun_opts_len = tun_info->options_len; | |
a93dcaad | 313 | int sum = nla_total_size(0); /* PSAMPLE_ATTR_TUNNEL */ |
d8bed686 CM |
314 | |
315 | if (tun_key->tun_flags & TUNNEL_KEY) | |
a93dcaad | 316 | sum += nla_total_size_64bit(sizeof(u64)); |
d8bed686 CM |
317 | |
318 | if (tun_info->mode & IP_TUNNEL_INFO_BRIDGE) | |
319 | sum += nla_total_size(0); | |
320 | ||
321 | switch (tun_proto) { | |
322 | case AF_INET: | |
323 | if (tun_key->u.ipv4.src) | |
324 | sum += nla_total_size(sizeof(u32)); | |
325 | if (tun_key->u.ipv4.dst) | |
326 | sum += nla_total_size(sizeof(u32)); | |
327 | break; | |
328 | case AF_INET6: | |
329 | if (!ipv6_addr_any(&tun_key->u.ipv6.src)) | |
330 | sum += nla_total_size(sizeof(struct in6_addr)); | |
331 | if (!ipv6_addr_any(&tun_key->u.ipv6.dst)) | |
332 | sum += nla_total_size(sizeof(struct in6_addr)); | |
333 | break; | |
334 | } | |
335 | if (tun_key->tos) | |
336 | sum += nla_total_size(sizeof(u8)); | |
337 | sum += nla_total_size(sizeof(u8)); /* TTL */ | |
338 | if (tun_key->tun_flags & TUNNEL_DONT_FRAGMENT) | |
339 | sum += nla_total_size(0); | |
340 | if (tun_key->tun_flags & TUNNEL_CSUM) | |
341 | sum += nla_total_size(0); | |
342 | if (tun_key->tp_src) | |
343 | sum += nla_total_size(sizeof(u16)); | |
344 | if (tun_key->tp_dst) | |
345 | sum += nla_total_size(sizeof(u16)); | |
346 | if (tun_key->tun_flags & TUNNEL_OAM) | |
347 | sum += nla_total_size(0); | |
348 | if (tun_opts_len) { | |
349 | if (tun_key->tun_flags & TUNNEL_GENEVE_OPT) | |
350 | sum += nla_total_size(tun_opts_len); | |
351 | else if (tun_key->tun_flags & TUNNEL_ERSPAN_OPT) | |
352 | sum += nla_total_size(tun_opts_len); | |
353 | } | |
354 | ||
355 | return sum; | |
356 | } | |
07a7f308 | 357 | #endif |
d8bed686 | 358 | |
6ae0a628 | 359 | void psample_sample_packet(struct psample_group *group, struct sk_buff *skb, |
a03e99d3 | 360 | u32 sample_rate, const struct psample_metadata *md) |
6ae0a628 | 361 | { |
07e1a580 | 362 | ktime_t tstamp = ktime_get_real(); |
a03e99d3 IS |
363 | int out_ifindex = md->out_ifindex; |
364 | int in_ifindex = md->in_ifindex; | |
365 | u32 trunc_size = md->trunc_size; | |
07a7f308 | 366 | #ifdef CONFIG_INET |
d8bed686 | 367 | struct ip_tunnel_info *tun_info; |
07a7f308 | 368 | #endif |
6ae0a628 YG |
369 | struct sk_buff *nl_skb; |
370 | int data_len; | |
371 | int meta_len; | |
372 | void *data; | |
373 | int ret; | |
374 | ||
375 | meta_len = (in_ifindex ? nla_total_size(sizeof(u16)) : 0) + | |
376 | (out_ifindex ? nla_total_size(sizeof(u16)) : 0) + | |
07e1a580 IS |
377 | (md->out_tc_valid ? nla_total_size(sizeof(u16)) : 0) + |
378 | (md->out_tc_occ_valid ? nla_total_size_64bit(sizeof(u64)) : 0) + | |
379 | (md->latency_valid ? nla_total_size_64bit(sizeof(u64)) : 0) + | |
6ae0a628 YG |
380 | nla_total_size(sizeof(u32)) + /* sample_rate */ |
381 | nla_total_size(sizeof(u32)) + /* orig_size */ | |
382 | nla_total_size(sizeof(u32)) + /* group_num */ | |
07e1a580 IS |
383 | nla_total_size(sizeof(u32)) + /* seq */ |
384 | nla_total_size_64bit(sizeof(u64)) + /* timestamp */ | |
385 | nla_total_size(sizeof(u16)); /* protocol */ | |
6ae0a628 | 386 | |
07a7f308 | 387 | #ifdef CONFIG_INET |
d8bed686 CM |
388 | tun_info = skb_tunnel_info(skb); |
389 | if (tun_info) | |
390 | meta_len += psample_tunnel_meta_len(tun_info); | |
07a7f308 | 391 | #endif |
d8bed686 | 392 | |
6ae0a628 YG |
393 | data_len = min(skb->len, trunc_size); |
394 | if (meta_len + nla_total_size(data_len) > PSAMPLE_MAX_PACKET_SIZE) | |
395 | data_len = PSAMPLE_MAX_PACKET_SIZE - meta_len - NLA_HDRLEN | |
396 | - NLA_ALIGNTO; | |
397 | ||
7eb9d767 | 398 | nl_skb = genlmsg_new(meta_len + nla_total_size(data_len), GFP_ATOMIC); |
6ae0a628 YG |
399 | if (unlikely(!nl_skb)) |
400 | return; | |
401 | ||
402 | data = genlmsg_put(nl_skb, 0, 0, &psample_nl_family, 0, | |
403 | PSAMPLE_CMD_SAMPLE); | |
404 | if (unlikely(!data)) | |
405 | goto error; | |
406 | ||
407 | if (in_ifindex) { | |
408 | ret = nla_put_u16(nl_skb, PSAMPLE_ATTR_IIFINDEX, in_ifindex); | |
409 | if (unlikely(ret < 0)) | |
410 | goto error; | |
411 | } | |
412 | ||
413 | if (out_ifindex) { | |
414 | ret = nla_put_u16(nl_skb, PSAMPLE_ATTR_OIFINDEX, out_ifindex); | |
415 | if (unlikely(ret < 0)) | |
416 | goto error; | |
417 | } | |
418 | ||
419 | ret = nla_put_u32(nl_skb, PSAMPLE_ATTR_SAMPLE_RATE, sample_rate); | |
420 | if (unlikely(ret < 0)) | |
421 | goto error; | |
422 | ||
423 | ret = nla_put_u32(nl_skb, PSAMPLE_ATTR_ORIGSIZE, skb->len); | |
424 | if (unlikely(ret < 0)) | |
425 | goto error; | |
426 | ||
427 | ret = nla_put_u32(nl_skb, PSAMPLE_ATTR_SAMPLE_GROUP, group->group_num); | |
428 | if (unlikely(ret < 0)) | |
429 | goto error; | |
430 | ||
431 | ret = nla_put_u32(nl_skb, PSAMPLE_ATTR_GROUP_SEQ, group->seq++); | |
432 | if (unlikely(ret < 0)) | |
433 | goto error; | |
434 | ||
07e1a580 IS |
435 | if (md->out_tc_valid) { |
436 | ret = nla_put_u16(nl_skb, PSAMPLE_ATTR_OUT_TC, md->out_tc); | |
437 | if (unlikely(ret < 0)) | |
438 | goto error; | |
439 | } | |
440 | ||
441 | if (md->out_tc_occ_valid) { | |
442 | ret = nla_put_u64_64bit(nl_skb, PSAMPLE_ATTR_OUT_TC_OCC, | |
443 | md->out_tc_occ, PSAMPLE_ATTR_PAD); | |
444 | if (unlikely(ret < 0)) | |
445 | goto error; | |
446 | } | |
447 | ||
448 | if (md->latency_valid) { | |
449 | ret = nla_put_u64_64bit(nl_skb, PSAMPLE_ATTR_LATENCY, | |
450 | md->latency, PSAMPLE_ATTR_PAD); | |
451 | if (unlikely(ret < 0)) | |
452 | goto error; | |
453 | } | |
454 | ||
455 | ret = nla_put_u64_64bit(nl_skb, PSAMPLE_ATTR_TIMESTAMP, | |
456 | ktime_to_ns(tstamp), PSAMPLE_ATTR_PAD); | |
457 | if (unlikely(ret < 0)) | |
458 | goto error; | |
459 | ||
460 | ret = nla_put_u16(nl_skb, PSAMPLE_ATTR_PROTO, | |
461 | be16_to_cpu(skb->protocol)); | |
462 | if (unlikely(ret < 0)) | |
463 | goto error; | |
464 | ||
6ae0a628 YG |
465 | if (data_len) { |
466 | int nla_len = nla_total_size(data_len); | |
467 | struct nlattr *nla; | |
468 | ||
4df864c1 | 469 | nla = skb_put(nl_skb, nla_len); |
6ae0a628 YG |
470 | nla->nla_type = PSAMPLE_ATTR_DATA; |
471 | nla->nla_len = nla_attr_size(data_len); | |
472 | ||
473 | if (skb_copy_bits(skb, 0, nla_data(nla), data_len)) | |
474 | goto error; | |
475 | } | |
476 | ||
07a7f308 | 477 | #ifdef CONFIG_INET |
d8bed686 CM |
478 | if (tun_info) { |
479 | ret = psample_ip_tun_to_nlattr(nl_skb, tun_info); | |
480 | if (unlikely(ret < 0)) | |
481 | goto error; | |
482 | } | |
07a7f308 | 483 | #endif |
d8bed686 | 484 | |
6ae0a628 YG |
485 | genlmsg_end(nl_skb, data); |
486 | genlmsg_multicast_netns(&psample_nl_family, group->net, nl_skb, 0, | |
487 | PSAMPLE_NL_MCGRP_SAMPLE, GFP_ATOMIC); | |
488 | ||
489 | return; | |
490 | error: | |
491 | pr_err_ratelimited("Could not create psample log message\n"); | |
492 | nlmsg_free(nl_skb); | |
493 | } | |
494 | EXPORT_SYMBOL_GPL(psample_sample_packet); | |
495 | ||
496 | static int __init psample_module_init(void) | |
497 | { | |
498 | return genl_register_family(&psample_nl_family); | |
499 | } | |
500 | ||
501 | static void __exit psample_module_exit(void) | |
502 | { | |
503 | genl_unregister_family(&psample_nl_family); | |
504 | } | |
505 | ||
506 | module_init(psample_module_init); | |
507 | module_exit(psample_module_exit); | |
508 | ||
f1fd20c3 | 509 | MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>"); |
6ae0a628 YG |
510 | MODULE_DESCRIPTION("netlink channel for packet sampling"); |
511 | MODULE_LICENSE("GPL v2"); |