2 * NETLINK Generic Netlink Family
4 * Authors: Jamal Hadi Salim
5 * Thomas Graf <tgraf@suug.ch>
6 * Johannes Berg <johannes@sipsolutions.net>
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/errno.h>
13 #include <linux/types.h>
14 #include <linux/socket.h>
15 #include <linux/string.h>
16 #include <linux/skbuff.h>
17 #include <linux/mutex.h>
18 #include <linux/bitmap.h>
19 #include <linux/rwsem.h>
21 #include <net/genetlink.h>
23 static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */
24 static DECLARE_RWSEM(cb_lock);
28 mutex_lock(&genl_mutex);
30 EXPORT_SYMBOL(genl_lock);
32 void genl_unlock(void)
34 mutex_unlock(&genl_mutex);
36 EXPORT_SYMBOL(genl_unlock);
39 int lockdep_genl_is_held(void)
41 return lockdep_is_held(&genl_mutex);
43 EXPORT_SYMBOL(lockdep_genl_is_held);
46 static void genl_lock_all(void)
52 static void genl_unlock_all(void)
58 #define GENL_FAM_TAB_SIZE 16
59 #define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1)
61 static struct list_head family_ht[GENL_FAM_TAB_SIZE];
63 * Bitmap of multicast groups that are currently in use.
65 * To avoid an allocation at boot of just one unsigned long,
66 * declare it global instead.
67 * Bit 0 is marked as already used since group 0 is invalid.
68 * Bit 1 is marked as already used since the drop-monitor code
69 * abuses the API and thinks it can statically use group 1.
70 * That group will typically conflict with other groups that
71 * any proper users use.
72 * Bit 16 is marked as used since it's used for generic netlink
73 * and the code no longer marks pre-reserved IDs as used.
74 * Bit 17 is marked as already used since the VFS quota code
75 * also abused this API and relied on family == group ID, we
76 * cater to that by giving it a static family and group ID.
77 * Bit 18 is marked as already used since the PMCRAID driver
78 * did the same thing as the VFS quota code (maybe copied?)
80 static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_CTRL) |
81 BIT(GENL_ID_VFS_DQUOT) |
83 static unsigned long *mc_groups = &mc_group_start;
84 static unsigned long mc_groups_longs = 1;
86 static int genl_ctrl_event(int event, struct genl_family *family,
87 const struct genl_multicast_group *grp,
90 static inline unsigned int genl_family_hash(unsigned int id)
92 return id & GENL_FAM_TAB_MASK;
95 static inline struct list_head *genl_family_chain(unsigned int id)
97 return &family_ht[genl_family_hash(id)];
100 static struct genl_family *genl_family_find_byid(unsigned int id)
102 struct genl_family *f;
104 list_for_each_entry(f, genl_family_chain(id), family_list)
111 static struct genl_family *genl_family_find_byname(char *name)
113 struct genl_family *f;
116 for (i = 0; i < GENL_FAM_TAB_SIZE; i++)
117 list_for_each_entry(f, genl_family_chain(i), family_list)
118 if (strcmp(f->name, name) == 0)
124 static const struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family)
128 for (i = 0; i < family->n_ops; i++)
129 if (family->ops[i].cmd == cmd)
130 return &family->ops[i];
135 /* Of course we are going to have problems once we hit
136 * 2^16 alive types, but that can only happen by year 2K
138 static u16 genl_generate_id(void)
140 static u16 id_gen_idx = GENL_MIN_ID;
143 for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) {
144 if (id_gen_idx != GENL_ID_VFS_DQUOT &&
145 id_gen_idx != GENL_ID_PMCRAID &&
146 !genl_family_find_byid(id_gen_idx))
148 if (++id_gen_idx > GENL_MAX_ID)
149 id_gen_idx = GENL_MIN_ID;
155 static int genl_allocate_reserve_groups(int n_groups, int *first_id)
157 unsigned long *new_groups;
165 id = find_first_zero_bit(mc_groups,
169 id = find_next_zero_bit(mc_groups,
170 mc_groups_longs * BITS_PER_LONG,
175 i < min_t(int, id + n_groups,
176 mc_groups_longs * BITS_PER_LONG);
178 if (test_bit(i, mc_groups)) {
185 if (id >= mc_groups_longs * BITS_PER_LONG) {
186 unsigned long new_longs = mc_groups_longs +
187 BITS_TO_LONGS(n_groups);
188 size_t nlen = new_longs * sizeof(unsigned long);
190 if (mc_groups == &mc_group_start) {
191 new_groups = kzalloc(nlen, GFP_KERNEL);
194 mc_groups = new_groups;
195 *mc_groups = mc_group_start;
197 new_groups = krealloc(mc_groups, nlen,
201 mc_groups = new_groups;
202 for (i = 0; i < BITS_TO_LONGS(n_groups); i++)
203 mc_groups[mc_groups_longs + i] = 0;
205 mc_groups_longs = new_longs;
209 for (i = id; i < id + n_groups; i++)
210 set_bit(i, mc_groups);
215 static struct genl_family genl_ctrl;
217 static int genl_validate_assign_mc_groups(struct genl_family *family)
220 int n_groups = family->n_mcgrps;
222 bool groups_allocated = false;
227 for (i = 0; i < n_groups; i++) {
228 const struct genl_multicast_group *grp = &family->mcgrps[i];
230 if (WARN_ON(grp->name[0] == '\0'))
232 if (WARN_ON(memchr(grp->name, '\0', GENL_NAMSIZ) == NULL))
236 /* special-case our own group and hacks */
237 if (family == &genl_ctrl) {
238 first_id = GENL_ID_CTRL;
239 BUG_ON(n_groups != 1);
240 } else if (strcmp(family->name, "NET_DM") == 0) {
242 BUG_ON(n_groups != 1);
243 } else if (family->id == GENL_ID_VFS_DQUOT) {
244 first_id = GENL_ID_VFS_DQUOT;
245 BUG_ON(n_groups != 1);
246 } else if (family->id == GENL_ID_PMCRAID) {
247 first_id = GENL_ID_PMCRAID;
248 BUG_ON(n_groups != 1);
250 groups_allocated = true;
251 err = genl_allocate_reserve_groups(n_groups, &first_id);
256 family->mcgrp_offset = first_id;
258 /* if still initializing, can't and don't need to to realloc bitmaps */
259 if (!init_net.genl_sock)
262 if (family->netnsok) {
265 netlink_table_grab();
267 for_each_net_rcu(net) {
268 err = __netlink_change_ngroups(net->genl_sock,
269 mc_groups_longs * BITS_PER_LONG);
272 * No need to roll back, can only fail if
273 * memory allocation fails and then the
274 * number of _possible_ groups has been
275 * increased on some sockets which is ok.
281 netlink_table_ungrab();
283 err = netlink_change_ngroups(init_net.genl_sock,
284 mc_groups_longs * BITS_PER_LONG);
287 if (groups_allocated && err) {
288 for (i = 0; i < family->n_mcgrps; i++)
289 clear_bit(family->mcgrp_offset + i, mc_groups);
295 static void genl_unregister_mc_groups(struct genl_family *family)
300 netlink_table_grab();
302 for_each_net_rcu(net) {
303 for (i = 0; i < family->n_mcgrps; i++)
304 __netlink_clear_multicast_users(
305 net->genl_sock, family->mcgrp_offset + i);
308 netlink_table_ungrab();
310 for (i = 0; i < family->n_mcgrps; i++) {
311 int grp_id = family->mcgrp_offset + i;
314 clear_bit(grp_id, mc_groups);
315 genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, family,
316 &family->mcgrps[i], grp_id);
320 static int genl_validate_ops(const struct genl_family *family)
322 const struct genl_ops *ops = family->ops;
323 unsigned int n_ops = family->n_ops;
326 if (WARN_ON(n_ops && !ops))
332 for (i = 0; i < n_ops; i++) {
333 if (ops[i].dumpit == NULL && ops[i].doit == NULL)
335 for (j = i + 1; j < n_ops; j++)
336 if (ops[i].cmd == ops[j].cmd)
344 * __genl_register_family - register a generic netlink family
345 * @family: generic netlink family
347 * Registers the specified family after validating it first. Only one
348 * family may be registered with the same family name or identifier.
349 * The family id may equal GENL_ID_GENERATE causing an unique id to
350 * be automatically generated and assigned.
352 * The family's ops array must already be assigned, you can use the
353 * genl_register_family_with_ops() helper function.
355 * Return 0 on success or a negative error code.
357 int __genl_register_family(struct genl_family *family)
359 int err = -EINVAL, i;
361 if (family->id && family->id < GENL_MIN_ID)
364 if (family->id > GENL_MAX_ID)
367 err = genl_validate_ops(family);
373 if (genl_family_find_byname(family->name)) {
378 if (family->id == GENL_ID_GENERATE) {
379 u16 newid = genl_generate_id();
387 } else if (genl_family_find_byid(family->id)) {
392 if (family->maxattr && !family->parallel_ops) {
393 family->attrbuf = kmalloc((family->maxattr+1) *
394 sizeof(struct nlattr *), GFP_KERNEL);
395 if (family->attrbuf == NULL) {
400 family->attrbuf = NULL;
402 err = genl_validate_assign_mc_groups(family);
406 list_add_tail(&family->family_list, genl_family_chain(family->id));
409 /* send all events */
410 genl_ctrl_event(CTRL_CMD_NEWFAMILY, family, NULL, 0);
411 for (i = 0; i < family->n_mcgrps; i++)
412 genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, family,
413 &family->mcgrps[i], family->mcgrp_offset + i);
422 EXPORT_SYMBOL(__genl_register_family);
425 * genl_unregister_family - unregister generic netlink family
426 * @family: generic netlink family
428 * Unregisters the specified family.
430 * Returns 0 on success or a negative error code.
432 int genl_unregister_family(struct genl_family *family)
434 struct genl_family *rc;
438 genl_unregister_mc_groups(family);
440 list_for_each_entry(rc, genl_family_chain(family->id), family_list) {
441 if (family->id != rc->id || strcmp(rc->name, family->name))
444 list_del(&rc->family_list);
448 kfree(family->attrbuf);
449 genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0);
457 EXPORT_SYMBOL(genl_unregister_family);
460 * genlmsg_new_unicast - Allocate generic netlink message for unicast
461 * @payload: size of the message payload
462 * @info: information on destination
463 * @flags: the type of memory to allocate
465 * Allocates a new sk_buff large enough to cover the specified payload
466 * plus required Netlink headers. Will check receiving socket for
467 * memory mapped i/o capability and use it if enabled. Will fall back
468 * to non-mapped skb if message size exceeds the frame size of the ring.
470 struct sk_buff *genlmsg_new_unicast(size_t payload, struct genl_info *info,
473 size_t len = nlmsg_total_size(genlmsg_total_size(payload));
475 return netlink_alloc_skb(info->dst_sk, len, info->snd_portid, flags);
477 EXPORT_SYMBOL_GPL(genlmsg_new_unicast);
480 * genlmsg_put - Add generic netlink header to netlink message
481 * @skb: socket buffer holding the message
482 * @portid: netlink portid the message is addressed to
483 * @seq: sequence number (usually the one of the sender)
484 * @family: generic netlink family
485 * @flags: netlink message flags
486 * @cmd: generic netlink command
488 * Returns pointer to user specific header
490 void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
491 struct genl_family *family, int flags, u8 cmd)
493 struct nlmsghdr *nlh;
494 struct genlmsghdr *hdr;
496 nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN +
497 family->hdrsize, flags);
501 hdr = nlmsg_data(nlh);
503 hdr->version = family->version;
506 return (char *) hdr + GENL_HDRLEN;
508 EXPORT_SYMBOL(genlmsg_put);
510 static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
512 /* our ops are always const - netlink API doesn't propagate that */
513 const struct genl_ops *ops = cb->data;
517 rc = ops->dumpit(skb, cb);
522 static int genl_lock_done(struct netlink_callback *cb)
524 /* our ops are always const - netlink API doesn't propagate that */
525 const struct genl_ops *ops = cb->data;
536 static int genl_family_rcv_msg(struct genl_family *family,
538 struct nlmsghdr *nlh)
540 const struct genl_ops *ops;
541 struct net *net = sock_net(skb->sk);
542 struct genl_info info;
543 struct genlmsghdr *hdr = nlmsg_data(nlh);
544 struct nlattr **attrbuf;
547 /* this family doesn't exist in this netns */
548 if (!family->netnsok && !net_eq(net, &init_net))
551 hdrlen = GENL_HDRLEN + family->hdrsize;
552 if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
555 ops = genl_get_cmd(hdr->cmd, family);
559 if ((ops->flags & GENL_ADMIN_PERM) &&
560 !netlink_capable(skb, CAP_NET_ADMIN))
563 if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
566 if (ops->dumpit == NULL)
569 if (!family->parallel_ops) {
570 struct netlink_dump_control c = {
571 .module = family->module,
572 /* we have const, but the netlink API doesn't */
574 .dump = genl_lock_dumpit,
575 .done = genl_lock_done,
579 rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
583 struct netlink_dump_control c = {
584 .module = family->module,
589 rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
595 if (ops->doit == NULL)
598 if (family->maxattr && family->parallel_ops) {
599 attrbuf = kmalloc((family->maxattr+1) *
600 sizeof(struct nlattr *), GFP_KERNEL);
604 attrbuf = family->attrbuf;
607 err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
613 info.snd_seq = nlh->nlmsg_seq;
614 info.snd_portid = NETLINK_CB(skb).portid;
616 info.genlhdr = nlmsg_data(nlh);
617 info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
618 info.attrs = attrbuf;
619 info.dst_sk = skb->sk;
620 genl_info_net_set(&info, net);
621 memset(&info.user_ptr, 0, sizeof(info.user_ptr));
623 if (family->pre_doit) {
624 err = family->pre_doit(ops, skb, &info);
629 err = ops->doit(skb, &info);
631 if (family->post_doit)
632 family->post_doit(ops, skb, &info);
635 if (family->parallel_ops)
641 static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
643 struct genl_family *family;
646 family = genl_family_find_byid(nlh->nlmsg_type);
650 if (!family->parallel_ops)
653 err = genl_family_rcv_msg(family, skb, nlh);
655 if (!family->parallel_ops)
661 static void genl_rcv(struct sk_buff *skb)
664 netlink_rcv_skb(skb, &genl_rcv_msg);
668 /**************************************************************************
670 **************************************************************************/
672 static struct genl_family genl_ctrl = {
676 .maxattr = CTRL_ATTR_MAX,
680 static int ctrl_fill_info(struct genl_family *family, u32 portid, u32 seq,
681 u32 flags, struct sk_buff *skb, u8 cmd)
685 hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd);
689 if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||
690 nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) ||
691 nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) ||
692 nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) ||
693 nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr))
694 goto nla_put_failure;
697 struct nlattr *nla_ops;
700 nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS);
702 goto nla_put_failure;
704 for (i = 0; i < family->n_ops; i++) {
706 const struct genl_ops *ops = &family->ops[i];
707 u32 op_flags = ops->flags;
710 op_flags |= GENL_CMD_CAP_DUMP;
712 op_flags |= GENL_CMD_CAP_DO;
714 op_flags |= GENL_CMD_CAP_HASPOL;
716 nest = nla_nest_start(skb, i + 1);
718 goto nla_put_failure;
720 if (nla_put_u32(skb, CTRL_ATTR_OP_ID, ops->cmd) ||
721 nla_put_u32(skb, CTRL_ATTR_OP_FLAGS, op_flags))
722 goto nla_put_failure;
724 nla_nest_end(skb, nest);
727 nla_nest_end(skb, nla_ops);
730 if (family->n_mcgrps) {
731 struct nlattr *nla_grps;
734 nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS);
735 if (nla_grps == NULL)
736 goto nla_put_failure;
738 for (i = 0; i < family->n_mcgrps; i++) {
740 const struct genl_multicast_group *grp;
742 grp = &family->mcgrps[i];
744 nest = nla_nest_start(skb, i + 1);
746 goto nla_put_failure;
748 if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID,
749 family->mcgrp_offset + i) ||
750 nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME,
752 goto nla_put_failure;
754 nla_nest_end(skb, nest);
756 nla_nest_end(skb, nla_grps);
759 return genlmsg_end(skb, hdr);
762 genlmsg_cancel(skb, hdr);
766 static int ctrl_fill_mcgrp_info(struct genl_family *family,
767 const struct genl_multicast_group *grp,
768 int grp_id, u32 portid, u32 seq, u32 flags,
769 struct sk_buff *skb, u8 cmd)
772 struct nlattr *nla_grps;
775 hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd);
779 if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||
780 nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id))
781 goto nla_put_failure;
783 nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS);
784 if (nla_grps == NULL)
785 goto nla_put_failure;
787 nest = nla_nest_start(skb, 1);
789 goto nla_put_failure;
791 if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, grp_id) ||
792 nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME,
794 goto nla_put_failure;
796 nla_nest_end(skb, nest);
797 nla_nest_end(skb, nla_grps);
799 return genlmsg_end(skb, hdr);
802 genlmsg_cancel(skb, hdr);
806 static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
810 struct genl_family *rt;
811 struct net *net = sock_net(skb->sk);
812 int chains_to_skip = cb->args[0];
813 int fams_to_skip = cb->args[1];
815 for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) {
817 list_for_each_entry(rt, genl_family_chain(i), family_list) {
818 if (!rt->netnsok && !net_eq(net, &init_net))
820 if (++n < fams_to_skip)
822 if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid,
823 cb->nlh->nlmsg_seq, NLM_F_MULTI,
824 skb, CTRL_CMD_NEWFAMILY) < 0)
838 static struct sk_buff *ctrl_build_family_msg(struct genl_family *family,
839 u32 portid, int seq, u8 cmd)
844 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
846 return ERR_PTR(-ENOBUFS);
848 err = ctrl_fill_info(family, portid, seq, 0, skb, cmd);
857 static struct sk_buff *
858 ctrl_build_mcgrp_msg(struct genl_family *family,
859 const struct genl_multicast_group *grp,
860 int grp_id, u32 portid, int seq, u8 cmd)
865 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
867 return ERR_PTR(-ENOBUFS);
869 err = ctrl_fill_mcgrp_info(family, grp, grp_id, portid,
879 static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = {
880 [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 },
881 [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_NUL_STRING,
882 .len = GENL_NAMSIZ - 1 },
885 static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
888 struct genl_family *res = NULL;
891 if (info->attrs[CTRL_ATTR_FAMILY_ID]) {
892 u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]);
893 res = genl_family_find_byid(id);
897 if (info->attrs[CTRL_ATTR_FAMILY_NAME]) {
900 name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]);
901 res = genl_family_find_byname(name);
902 #ifdef CONFIG_MODULES
906 request_module("net-pf-%d-proto-%d-family-%s",
907 PF_NETLINK, NETLINK_GENERIC, name);
910 res = genl_family_find_byname(name);
919 if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) {
920 /* family doesn't exist here */
924 msg = ctrl_build_family_msg(res, info->snd_portid, info->snd_seq,
929 return genlmsg_reply(msg, info);
932 static int genl_ctrl_event(int event, struct genl_family *family,
933 const struct genl_multicast_group *grp,
938 /* genl is still initialising */
939 if (!init_net.genl_sock)
943 case CTRL_CMD_NEWFAMILY:
944 case CTRL_CMD_DELFAMILY:
946 msg = ctrl_build_family_msg(family, 0, 0, event);
948 case CTRL_CMD_NEWMCAST_GRP:
949 case CTRL_CMD_DELMCAST_GRP:
951 msg = ctrl_build_mcgrp_msg(family, grp, grp_id, 0, 0, event);
960 if (!family->netnsok) {
961 genlmsg_multicast_netns(&genl_ctrl, &init_net, msg, 0,
965 genlmsg_multicast_allns(&genl_ctrl, msg, 0,
973 static struct genl_ops genl_ctrl_ops[] = {
975 .cmd = CTRL_CMD_GETFAMILY,
976 .doit = ctrl_getfamily,
977 .dumpit = ctrl_dumpfamily,
978 .policy = ctrl_policy,
982 static struct genl_multicast_group genl_ctrl_groups[] = {
983 { .name = "notify", },
986 static int __net_init genl_pernet_init(struct net *net)
988 struct netlink_kernel_cfg cfg = {
990 .flags = NL_CFG_F_NONROOT_RECV,
993 /* we'll bump the group number right afterwards */
994 net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, &cfg);
996 if (!net->genl_sock && net_eq(net, &init_net))
997 panic("GENL: Cannot initialize generic netlink\n");
1005 static void __net_exit genl_pernet_exit(struct net *net)
1007 netlink_kernel_release(net->genl_sock);
1008 net->genl_sock = NULL;
1011 static struct pernet_operations genl_pernet_ops = {
1012 .init = genl_pernet_init,
1013 .exit = genl_pernet_exit,
1016 static int __init genl_init(void)
1020 for (i = 0; i < GENL_FAM_TAB_SIZE; i++)
1021 INIT_LIST_HEAD(&family_ht[i]);
1023 err = genl_register_family_with_ops_groups(&genl_ctrl, genl_ctrl_ops,
1028 err = register_pernet_subsys(&genl_pernet_ops);
1035 panic("GENL: Cannot register controller: %d\n", err);
1038 subsys_initcall(genl_init);
1040 static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group,
1043 struct sk_buff *tmp;
1044 struct net *net, *prev = NULL;
1047 for_each_net_rcu(net) {
1049 tmp = skb_clone(skb, flags);
1054 err = nlmsg_multicast(prev->genl_sock, tmp,
1055 portid, group, flags);
1063 return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags);
1069 int genlmsg_multicast_allns(struct genl_family *family, struct sk_buff *skb,
1070 u32 portid, unsigned int group, gfp_t flags)
1072 if (WARN_ON_ONCE(group >= family->n_mcgrps))
1074 group = family->mcgrp_offset + group;
1075 return genlmsg_mcast(skb, portid, group, flags);
1077 EXPORT_SYMBOL(genlmsg_multicast_allns);
1079 void genl_notify(struct genl_family *family,
1080 struct sk_buff *skb, struct net *net, u32 portid, u32 group,
1081 struct nlmsghdr *nlh, gfp_t flags)
1083 struct sock *sk = net->genl_sock;
1087 report = nlmsg_report(nlh);
1089 if (WARN_ON_ONCE(group >= family->n_mcgrps))
1091 group = family->mcgrp_offset + group;
1092 nlmsg_notify(sk, skb, portid, group, report, flags);
1094 EXPORT_SYMBOL(genl_notify);