1 // SPDX-License-Identifier: GPL-2.0
57 	if (!family->parallel_ops)  in genl_op_lock()
63 	if (!family->parallel_ops)  in genl_op_unlock()
75  * Bit 1 is marked as already used since the drop-monitor code
80  * and the code no longer marks pre-reserved IDs as used.
93 /* We need the last attribute with non-zero ID therefore a 2-entry array */
107 	BUILD_BUG_ON(ARRAY_SIZE(genl_policy_reject_all) - 1 != 1);  in genl_op_fill_in_reject_policy()
109 	if (op->policy || op->cmd < family->resv_start_op)  in genl_op_fill_in_reject_policy()
112 	op->policy = genl_policy_reject_all;  in genl_op_fill_in_reject_policy()
113 	op->maxattr = 1;  in genl_op_fill_in_reject_policy()
120 	if (op->policy)  in genl_op_fill_in_reject_policy_split()
123 	op->policy = genl_policy_reject_all;  in genl_op_fill_in_reject_policy_split()
124 	op->maxattr = 1;  in genl_op_fill_in_reject_policy_split()
138 		if (strcmp(family->name, name) == 0)  in genl_family_find_byname()
157 	*op = family->ops[i];  in genl_op_from_full()
159 	if (!op->maxattr)  in genl_op_from_full()
160 		op->maxattr = family->maxattr;  in genl_op_from_full()
161 	if (!op->policy)  in genl_op_from_full()
162 		op->policy = family->policy;  in genl_op_from_full()
172 	for (i = 0; i < family->n_ops; i++)  in genl_get_cmd_full()
173 		if (family->ops[i].cmd == cmd) {  in genl_get_cmd_full()
178 	return -ENOENT;  in genl_get_cmd_full()
185 	op->doit	= family->small_ops[i].doit;  in genl_op_from_small()
186 	op->dumpit	= family->small_ops[i].dumpit;  in genl_op_from_small()
187 	op->cmd		= family->small_ops[i].cmd;  in genl_op_from_small()
188 	op->internal_flags = family->small_ops[i].internal_flags;  in genl_op_from_small()
189 	op->flags	= family->small_ops[i].flags;  in genl_op_from_small()
190 	op->validate	= family->small_ops[i].validate;  in genl_op_from_small()
192 	op->maxattr = family->maxattr;  in genl_op_from_small()
193 	op->policy = family->policy;  in genl_op_from_small()
203 	for (i = 0; i < family->n_small_ops; i++)  in genl_get_cmd_small()
204 		if (family->small_ops[i].cmd == cmd) {  in genl_get_cmd_small()
209 	return -ENOENT;  in genl_get_cmd_small()
214 	const struct genl_family *family = iter->family;  in genl_op_from_split()
217 	i = iter->entry_idx - family->n_ops - family->n_small_ops;  in genl_op_from_split()
219 	if (family->split_ops[i + cnt].flags & GENL_CMD_CAP_DO) {  in genl_op_from_split()
220 		iter->doit = family->split_ops[i + cnt];  in genl_op_from_split()
221 		genl_op_fill_in_reject_policy_split(family, &iter->doit);  in genl_op_from_split()
224 		memset(&iter->doit, 0, sizeof(iter->doit));  in genl_op_from_split()
227 	if (i + cnt < family->n_split_ops &&  in genl_op_from_split()
228 	    family->split_ops[i + cnt].flags & GENL_CMD_CAP_DUMP) {  in genl_op_from_split()
229 		iter->dumpit = family->split_ops[i + cnt];  in genl_op_from_split()
230 		genl_op_fill_in_reject_policy_split(family, &iter->dumpit);  in genl_op_from_split()
233 		memset(&iter->dumpit, 0, sizeof(iter->dumpit));  in genl_op_from_split()
237 	iter->entry_idx += cnt;  in genl_op_from_split()
246 	for (i = 0; i < family->n_split_ops; i++)  in genl_get_cmd_split()
247 		if (family->split_ops[i].cmd == cmd &&  in genl_get_cmd_split()
248 		    family->split_ops[i].flags & flag) {  in genl_get_cmd_split()
249 			*op = family->split_ops[i];  in genl_get_cmd_split()
253 	return -ENOENT;  in genl_get_cmd_split()
261 	if ((flags & GENL_CMD_CAP_DO && !full->doit) ||  in genl_cmd_full_to_split()
262 	    (flags & GENL_CMD_CAP_DUMP && !full->dumpit)) {  in genl_cmd_full_to_split()
264 		return -ENOENT;  in genl_cmd_full_to_split()
268 		op->start	= full->start;  in genl_cmd_full_to_split()
269 		op->dumpit	= full->dumpit;  in genl_cmd_full_to_split()
270 		op->done	= full->done;  in genl_cmd_full_to_split()
272 		op->pre_doit	= family->pre_doit;  in genl_cmd_full_to_split()
273 		op->doit	= full->doit;  in genl_cmd_full_to_split()
274 		op->post_doit	= family->post_doit;  in genl_cmd_full_to_split()
278 	    full->validate & GENL_DONT_VALIDATE_DUMP) {  in genl_cmd_full_to_split()
279 		op->policy	= NULL;  in genl_cmd_full_to_split()
280 		op->maxattr	= 0;  in genl_cmd_full_to_split()
282 		op->policy	= full->policy;  in genl_cmd_full_to_split()
283 		op->maxattr	= full->maxattr;  in genl_cmd_full_to_split()
286 	op->cmd			= full->cmd;  in genl_cmd_full_to_split()
287 	op->internal_flags	= full->internal_flags;  in genl_cmd_full_to_split()
288 	op->flags		= full->flags;  in genl_cmd_full_to_split()
289 	op->validate		= full->validate;  in genl_cmd_full_to_split()
292 	op->flags		|= flags;  in genl_cmd_full_to_split()
306 	if (err == -ENOENT)  in genl_get_cmd()
319  * Fail if both are missing, genl_get_cmd() will zero-init in case of failure.
330 	return err1 && err2 ? -ENOENT : 0;  in genl_get_cmd_both()
336 	iter->family = family;  in genl_op_iter_init()
337 	iter->cmd_idx = 0;  in genl_op_iter_init()
338 	iter->entry_idx = 0;  in genl_op_iter_init()
340 	iter->flags = 0;  in genl_op_iter_init()
342 	return iter->family->n_ops +  in genl_op_iter_init()
343 		iter->family->n_small_ops +  in genl_op_iter_init()
344 		iter->family->n_split_ops;  in genl_op_iter_init()
349 	const struct genl_family *family = iter->family;  in genl_op_iter_next()
353 	if (iter->entry_idx < family->n_ops) {  in genl_op_iter_next()
354 		genl_op_from_full(family, iter->entry_idx, &op);  in genl_op_iter_next()
355 	} else if (iter->entry_idx < family->n_ops + family->n_small_ops) {  in genl_op_iter_next()
356 		genl_op_from_small(family, iter->entry_idx - family->n_ops,  in genl_op_iter_next()
358 	} else if (iter->entry_idx <  in genl_op_iter_next()
359 		   family->n_ops + family->n_small_ops + family->n_split_ops) {  in genl_op_iter_next()
367 	iter->cmd_idx++;  in genl_op_iter_next()
370 		iter->entry_idx++;  in genl_op_iter_next()
372 		genl_cmd_full_to_split(&iter->doit, family,  in genl_op_iter_next()
374 		genl_cmd_full_to_split(&iter->dumpit, family,  in genl_op_iter_next()
378 	iter->cmd = iter->doit.cmd | iter->dumpit.cmd;  in genl_op_iter_next()
379 	iter->flags = iter->doit.flags | iter->dumpit.flags;  in genl_op_iter_next()
392 	return iter->cmd_idx;  in genl_op_iter_idx()
433 					return -ENOMEM;  in genl_allocate_reserve_groups()
440 					return -ENOMEM;  in genl_allocate_reserve_groups()
460 	int n_groups = family->n_mcgrps;  in genl_validate_assign_mc_groups()
468 		const struct genl_multicast_group *grp = &family->mcgrps[i];  in genl_validate_assign_mc_groups()
470 		if (WARN_ON(grp->name[0] == '\0'))  in genl_validate_assign_mc_groups()
471 			return -EINVAL;  in genl_validate_assign_mc_groups()
472 		if (WARN_ON(!string_is_terminated(grp->name, GENL_NAMSIZ)))  in genl_validate_assign_mc_groups()
473 			return -EINVAL;  in genl_validate_assign_mc_groups()
476 	/* special-case our own group and hacks */  in genl_validate_assign_mc_groups()
480 	} else if (strcmp(family->name, "NET_DM") == 0) {  in genl_validate_assign_mc_groups()
483 	} else if (family->id == GENL_ID_VFS_DQUOT) {  in genl_validate_assign_mc_groups()
486 	} else if (family->id == GENL_ID_PMCRAID) {  in genl_validate_assign_mc_groups()
496 	family->mcgrp_offset = first_id;  in genl_validate_assign_mc_groups()
502 	if (family->netnsok) {  in genl_validate_assign_mc_groups()
508 			err = __netlink_change_ngroups(net->genl_sock,  in genl_validate_assign_mc_groups()
528 		for (i = 0; i < family->n_mcgrps; i++)  in genl_validate_assign_mc_groups()
529 			clear_bit(family->mcgrp_offset + i, mc_groups);  in genl_validate_assign_mc_groups()
543 		for (i = 0; i < family->n_mcgrps; i++)  in genl_unregister_mc_groups()
545 				net->genl_sock, family->mcgrp_offset + i);  in genl_unregister_mc_groups()
550 	for (i = 0; i < family->n_mcgrps; i++) {  in genl_unregister_mc_groups()
551 		int grp_id = family->mcgrp_offset + i;  in genl_unregister_mc_groups()
556 				&family->mcgrps[i], grp_id);  in genl_unregister_mc_groups()
562 	if (WARN_ON(hweight8(op->flags & (GENL_CMD_CAP_DO |  in genl_split_op_check()
573 	if (WARN_ON(family->n_ops && !family->ops) ||  in genl_validate_ops()
574 	    WARN_ON(family->n_small_ops && !family->small_ops) ||  in genl_validate_ops()
575 	    WARN_ON(family->n_split_ops && !family->split_ops))  in genl_validate_ops()
576 		return -EINVAL;  in genl_validate_ops()
580 			return -EINVAL;  in genl_validate_ops()
582 		if (WARN_ON(i.cmd >= family->resv_start_op &&  in genl_validate_ops()
584 			return -EINVAL;  in genl_validate_ops()
589 				return -EINVAL;  in genl_validate_ops()
593 	if (family->n_split_ops) {  in genl_validate_ops()
594 		if (genl_split_op_check(&family->split_ops[0]))  in genl_validate_ops()
595 			return -EINVAL;  in genl_validate_ops()
598 	for (s = 1; s < family->n_split_ops; s++) {  in genl_validate_ops()
601 		a = &family->split_ops[s - 1];  in genl_validate_ops()
602 		b = &family->split_ops[s];  in genl_validate_ops()
605 			return -EINVAL;  in genl_validate_ops()
608 		if (a->cmd < b->cmd) {  in genl_validate_ops()
610 		} else if (a->cmd > b->cmd) {  in genl_validate_ops()
612 			return -EINVAL;  in genl_validate_ops()
615 		if (a->internal_flags != b->internal_flags ||  in genl_validate_ops()
616 		    ((a->flags ^ b->flags) & ~(GENL_CMD_CAP_DO |  in genl_validate_ops()
619 			return -EINVAL;  in genl_validate_ops()
622 		if ((a->flags & GENL_CMD_CAP_DO) &&  in genl_validate_ops()
623 		    (b->flags & GENL_CMD_CAP_DUMP))  in genl_validate_ops()
627 		return -EINVAL;  in genl_validate_ops()
634  * genl_register_family - register a generic netlink family
656 	if (genl_family_find_byname(family->name)) {  in genl_register_family()
657 		err = -EEXIST;  in genl_register_family()
662 	 * Sadly, a few cases need to be special-cased  in genl_register_family()
671 	} else if (strcmp(family->name, "pmcraid") == 0) {  in genl_register_family()
673 	} else if (strcmp(family->name, "VFS_DQUOT") == 0) {  in genl_register_family()
677 	family->id = idr_alloc_cyclic(&genl_fam_idr, family,  in genl_register_family()
679 	if (family->id < 0) {  in genl_register_family()
680 		err = family->id;  in genl_register_family()
692 	for (i = 0; i < family->n_mcgrps; i++)  in genl_register_family()
694 				&family->mcgrps[i], family->mcgrp_offset + i);  in genl_register_family()
699 	idr_remove(&genl_fam_idr, family->id);  in genl_register_family()
707  * genl_unregister_family - unregister generic netlink family
718 	if (!genl_family_find_byid(family->id)) {  in genl_unregister_family()
720 		return -ENOENT;  in genl_unregister_family()
725 	idr_remove(&genl_fam_idr, family->id);  in genl_unregister_family()
739  * genlmsg_put - Add generic netlink header to netlink message
755 	nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN +  in genlmsg_put()
756 			family->hdrsize, flags);  in genlmsg_put()
761 	hdr->cmd = cmd;  in genlmsg_put()
762 	hdr->version = family->version;  in genlmsg_put()
763 	hdr->reserved = 0;  in genlmsg_put()
787 	enum netlink_validation validate = ops->validate & no_strict_flag ?  in genl_family_rcv_msg_attrs_parse()
793 	if (!ops->maxattr)  in genl_family_rcv_msg_attrs_parse()
796 	attrbuf = kmalloc_array(ops->maxattr + 1,  in genl_family_rcv_msg_attrs_parse()
799 		return ERR_PTR(-ENOMEM);  in genl_family_rcv_msg_attrs_parse()
801 	err = __nlmsg_parse(nlh, hdrlen, attrbuf, ops->maxattr, ops->policy,  in genl_family_rcv_msg_attrs_parse()
825 	struct genl_start_context *ctx = cb->data;  in genl_start()
831 	ops = ctx->ops;  in genl_start()
832 	if (!(ops->validate & GENL_DONT_VALIDATE_DUMP) &&  in genl_start()
833 	    ctx->nlh->nlmsg_len < nlmsg_msg_size(ctx->hdrlen))  in genl_start()
834 		return -EINVAL;  in genl_start()
836 	attrs = genl_family_rcv_msg_attrs_parse(ctx->family, ctx->nlh, ctx->extack,  in genl_start()
837 						ops, ctx->hdrlen,  in genl_start()
845 		return -ENOMEM;  in genl_start()
847 	info->op = *ops;  in genl_start()
848 	info->info.family	= ctx->family;  in genl_start()
849 	info->info.snd_seq	= cb->nlh->nlmsg_seq;  in genl_start()
850 	info->info.snd_portid	= NETLINK_CB(cb->skb).portid;  in genl_start()
851 	info->info.nlhdr	= cb->nlh;  in genl_start()
852 	info->info.genlhdr	= nlmsg_data(cb->nlh);  in genl_start()
853 	info->info.attrs	= attrs;  in genl_start()
854 	genl_info_net_set(&info->info, sock_net(cb->skb->sk));  in genl_start()
855 	info->info.extack	= cb->extack;  in genl_start()
856 	memset(&info->info.user_ptr, 0, sizeof(info->info.user_ptr));  in genl_start()
858 	cb->data = info;  in genl_start()
859 	if (ops->start) {  in genl_start()
860 		genl_op_lock(ctx->family);  in genl_start()
861 		rc = ops->start(cb);  in genl_start()
862 		genl_op_unlock(ctx->family);  in genl_start()
866 		genl_family_rcv_msg_attrs_free(info->info.attrs);  in genl_start()
868 		cb->data = NULL;  in genl_start()
875 	struct genl_dumpit_info *dump_info = cb->data;  in genl_dumpit()
876 	const struct genl_split_ops *ops = &dump_info->op;  in genl_dumpit()
877 	struct genl_info *info = &dump_info->info;  in genl_dumpit()
880 	info->extack = cb->extack;  in genl_dumpit()
882 	genl_op_lock(info->family);  in genl_dumpit()
883 	rc = ops->dumpit(skb, cb);  in genl_dumpit()
884 	genl_op_unlock(info->family);  in genl_dumpit()
890 	struct genl_dumpit_info *dump_info = cb->data;  in genl_done()
891 	const struct genl_split_ops *ops = &dump_info->op;  in genl_done()
892 	struct genl_info *info = &dump_info->info;  in genl_done()
895 	info->extack = cb->extack;  in genl_done()
897 	if (ops->done) {  in genl_done()
898 		genl_op_lock(info->family);  in genl_done()
899 		rc = ops->done(cb);  in genl_done()
900 		genl_op_unlock(info->family);  in genl_done()
902 	genl_family_rcv_msg_attrs_free(info->attrs);  in genl_done()
916 		.module = family->module,  in genl_family_rcv_msg_dumpit()
932 	err = __netlink_dump_start(net->genl_sock, skb, nlh, &c);  in genl_family_rcv_msg_dumpit()
955 	info.snd_seq = nlh->nlmsg_seq;  in genl_family_rcv_msg_doit()
965 	if (ops->pre_doit) {  in genl_family_rcv_msg_doit()
966 		err = ops->pre_doit(ops, skb, &info);  in genl_family_rcv_msg_doit()
971 	err = ops->doit(skb, &info);  in genl_family_rcv_msg_doit()
973 	if (ops->post_doit)  in genl_family_rcv_msg_doit()
974 		ops->post_doit(ops, skb, &info);  in genl_family_rcv_msg_doit()
989 	if (hdr->cmd < family->resv_start_op)  in genl_header_check()
992 	if (hdr->reserved) {  in genl_header_check()
994 		return -EINVAL;  in genl_header_check()
1000 	flags = nlh->nlmsg_flags;  in genl_header_check()
1006 		return -EINVAL;  in genl_header_check()
1017 	struct net *net = sock_net(skb->sk);  in genl_family_rcv_msg()
1024 	if (!family->netnsok && !net_eq(net, &init_net))  in genl_family_rcv_msg()
1025 		return -ENOENT;  in genl_family_rcv_msg()
1027 	hdrlen = GENL_HDRLEN + family->hdrsize;  in genl_family_rcv_msg()
1028 	if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))  in genl_family_rcv_msg()
1029 		return -EINVAL;  in genl_family_rcv_msg()
1032 		return -EINVAL;  in genl_family_rcv_msg()
1034 	flags = (nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP ?  in genl_family_rcv_msg()
1036 	if (genl_get_cmd(hdr->cmd, flags, family, &op))  in genl_family_rcv_msg()
1037 		return -EOPNOTSUPP;  in genl_family_rcv_msg()
1041 		return -EPERM;  in genl_family_rcv_msg()
1044 	    !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))  in genl_family_rcv_msg()
1045 		return -EPERM;  in genl_family_rcv_msg()
1061 	family = genl_family_find_byid(nlh->nlmsg_type);  in genl_rcv_msg()
1063 		return -ENOENT;  in genl_rcv_msg()
1093 		return -1;  in ctrl_fill_info()
1095 	if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||  in ctrl_fill_info()
1096 	    nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) ||  in ctrl_fill_info()
1097 	    nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) ||  in ctrl_fill_info()
1098 	    nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) ||  in ctrl_fill_info()
1099 	    nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr))  in ctrl_fill_info()
1110 			struct nlattr *nest;  in ctrl_fill_info()  local
1117 			nest = nla_nest_start_noflag(skb, genl_op_iter_idx(&i));  in ctrl_fill_info()
1118 			if (nest == NULL)  in ctrl_fill_info()
1125 			nla_nest_end(skb, nest);  in ctrl_fill_info()
1131 	if (family->n_mcgrps) {  in ctrl_fill_info()
1139 		for (i = 0; i < family->n_mcgrps; i++) {  in ctrl_fill_info()
1140 			struct nlattr *nest;  in ctrl_fill_info()  local
1143 			grp = &family->mcgrps[i];  in ctrl_fill_info()
1145 			nest = nla_nest_start_noflag(skb, i + 1);  in ctrl_fill_info()
1146 			if (nest == NULL)  in ctrl_fill_info()
1150 					family->mcgrp_offset + i) ||  in ctrl_fill_info()
1152 					   grp->name))  in ctrl_fill_info()
1155 			nla_nest_end(skb, nest);  in ctrl_fill_info()
1165 	return -EMSGSIZE;  in ctrl_fill_info()
1175 	struct nlattr *nest;  in ctrl_fill_mcgrp_info()  local
1179 		return -1;  in ctrl_fill_mcgrp_info()
1181 	if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||  in ctrl_fill_mcgrp_info()
1182 	    nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id))  in ctrl_fill_mcgrp_info()
1189 	nest = nla_nest_start_noflag(skb, 1);  in ctrl_fill_mcgrp_info()
1190 	if (nest == NULL)  in ctrl_fill_mcgrp_info()
1195 			   grp->name))  in ctrl_fill_mcgrp_info()
1198 	nla_nest_end(skb, nest);  in ctrl_fill_mcgrp_info()
1206 	return -EMSGSIZE;  in ctrl_fill_mcgrp_info()
1213 	struct net *net = sock_net(skb->sk);  in ctrl_dumpfamily()
1214 	int fams_to_skip = cb->args[0];  in ctrl_dumpfamily()
1218 		if (!rt->netnsok && !net_eq(net, &init_net))  in ctrl_dumpfamily()
1224 		if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid,  in ctrl_dumpfamily()
1225 				   cb->nlh->nlmsg_seq, NLM_F_MULTI,  in ctrl_dumpfamily()
1227 			n--;  in ctrl_dumpfamily()
1232 	cb->args[0] = n;  in ctrl_dumpfamily()
1233 	return skb->len;  in ctrl_dumpfamily()
1244 		return ERR_PTR(-ENOBUFS);  in ctrl_build_family_msg()
1265 		return ERR_PTR(-ENOBUFS);  in ctrl_build_mcgrp_msg()
1280 				    .len = GENL_NAMSIZ - 1 },
1287 	int err = -EINVAL;  in ctrl_getfamily()
1289 	if (info->attrs[CTRL_ATTR_FAMILY_ID]) {  in ctrl_getfamily()
1290 		u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]);  in ctrl_getfamily()
1292 		err = -ENOENT;  in ctrl_getfamily()
1295 	if (info->attrs[CTRL_ATTR_FAMILY_NAME]) {  in ctrl_getfamily()
1298 		name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]);  in ctrl_getfamily()
1304 			request_module("net-pf-%d-proto-%d-family-%s",  in ctrl_getfamily()
1311 		err = -ENOENT;  in ctrl_getfamily()
1317 	if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) {  in ctrl_getfamily()
1319 		return -ENOENT;  in ctrl_getfamily()
1322 	msg = ctrl_build_family_msg(res, info->snd_portid, info->snd_seq,  in ctrl_getfamily()
1352 		return -EINVAL;  in genl_ctrl_event()
1358 	if (!family->netnsok)  in genl_ctrl_event()
1380 				    .len = GENL_NAMSIZ - 1 },
1387 	struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;  in ctrl_dumppolicy_start()
1388 	struct nlattr **tb = info->info.attrs;  in ctrl_dumppolicy_start()
1393 	BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));  in ctrl_dumppolicy_start()
1396 		return -EINVAL;  in ctrl_dumppolicy_start()
1399 		ctx->fam_id = nla_get_u16(tb[CTRL_ATTR_FAMILY_ID]);  in ctrl_dumppolicy_start()
1404 			return -ENOENT;  in ctrl_dumppolicy_start()
1405 		ctx->fam_id = rt->id;  in ctrl_dumppolicy_start()
1408 	rt = genl_family_find_byid(ctx->fam_id);  in ctrl_dumppolicy_start()
1410 		return -ENOENT;  in ctrl_dumppolicy_start()
1412 	ctx->rt = rt;  in ctrl_dumppolicy_start()
1417 		ctx->single_op = true;  in ctrl_dumppolicy_start()
1418 		ctx->op = nla_get_u32(tb[CTRL_ATTR_OP]);  in ctrl_dumppolicy_start()
1420 		err = genl_get_cmd_both(ctx->op, rt, &doit, &dump);  in ctrl_dumppolicy_start()
1422 			NL_SET_BAD_ATTR(cb->extack, tb[CTRL_ATTR_OP]);  in ctrl_dumppolicy_start()
1427 			err = netlink_policy_dump_add_policy(&ctx->state,  in ctrl_dumppolicy_start()
1434 			err = netlink_policy_dump_add_policy(&ctx->state,  in ctrl_dumppolicy_start()
1441 		if (!ctx->state)  in ctrl_dumppolicy_start()
1442 			return -ENODATA;  in ctrl_dumppolicy_start()
1444 		ctx->dump_map = 1;  in ctrl_dumppolicy_start()
1448 	ctx->op_iter = kmalloc(sizeof(*ctx->op_iter), GFP_KERNEL);  in ctrl_dumppolicy_start()
1449 	if (!ctx->op_iter)  in ctrl_dumppolicy_start()
1450 		return -ENOMEM;  in ctrl_dumppolicy_start()
1452 	genl_op_iter_init(rt, ctx->op_iter);  in ctrl_dumppolicy_start()
1453 	ctx->dump_map = genl_op_iter_next(ctx->op_iter);  in ctrl_dumppolicy_start()
1457 			err = netlink_policy_dump_add_policy(&ctx->state,  in ctrl_dumppolicy_start()
1464 			err = netlink_policy_dump_add_policy(&ctx->state,  in ctrl_dumppolicy_start()
1472 	if (!ctx->state) {  in ctrl_dumppolicy_start()
1473 		err = -ENODATA;  in ctrl_dumppolicy_start()
1479 	netlink_policy_dump_free(ctx->state);  in ctrl_dumppolicy_start()
1481 	kfree(ctx->op_iter);  in ctrl_dumppolicy_start()
1488 	struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;  in ctrl_dumppolicy_prep()
1491 	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,  in ctrl_dumppolicy_prep()
1492 			  cb->nlh->nlmsg_seq, &genl_ctrl,  in ctrl_dumppolicy_prep()
1497 	if (nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, ctx->fam_id))  in ctrl_dumppolicy_prep()
1508 	struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;  in ctrl_dumppolicy_put_op()
1514 	if (!doit->policy && !dumpit->policy)  in ctrl_dumppolicy_put_op()
1519 		return -ENOBUFS;  in ctrl_dumppolicy_put_op()
1525 	nest_op = nla_nest_start(skb, doit->cmd);  in ctrl_dumppolicy_put_op()
1529 	if (doit->policy) {  in ctrl_dumppolicy_put_op()
1530 		idx = netlink_policy_dump_get_policy_idx(ctx->state,  in ctrl_dumppolicy_put_op()
1531 							 doit->policy,  in ctrl_dumppolicy_put_op()
1532 							 doit->maxattr);  in ctrl_dumppolicy_put_op()
1537 	if (dumpit->policy) {  in ctrl_dumppolicy_put_op()
1538 		idx = netlink_policy_dump_get_policy_idx(ctx->state,  in ctrl_dumppolicy_put_op()
1539 							 dumpit->policy,  in ctrl_dumppolicy_put_op()
1540 							 dumpit->maxattr);  in ctrl_dumppolicy_put_op()
1553 	return -ENOBUFS;  in ctrl_dumppolicy_put_op()
1558 	struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;  in ctrl_dumppolicy()
1561 	if (ctx->dump_map) {  in ctrl_dumppolicy()
1562 		if (ctx->single_op) {  in ctrl_dumppolicy()
1565 			if (WARN_ON(genl_get_cmd_both(ctx->op, ctx->rt,  in ctrl_dumppolicy()
1567 				return -ENOENT;  in ctrl_dumppolicy()
1570 				return skb->len;  in ctrl_dumppolicy()
1572 			/* done with the per-op policy index list */  in ctrl_dumppolicy()
1573 			ctx->dump_map = 0;  in ctrl_dumppolicy()
1576 		while (ctx->dump_map) {  in ctrl_dumppolicy()
1578 						   &ctx->op_iter->doit,  in ctrl_dumppolicy()
1579 						   &ctx->op_iter->dumpit))  in ctrl_dumppolicy()
1580 				return skb->len;  in ctrl_dumppolicy()
1582 			ctx->dump_map = genl_op_iter_next(ctx->op_iter);  in ctrl_dumppolicy()
1586 	while (netlink_policy_dump_loop(ctx->state)) {  in ctrl_dumppolicy()
1587 		struct nlattr *nest;  in ctrl_dumppolicy()  local
1593 		nest = nla_nest_start(skb, CTRL_ATTR_POLICY);  in ctrl_dumppolicy()
1594 		if (!nest)  in ctrl_dumppolicy()
1597 		if (netlink_policy_dump_write(skb, ctx->state))  in ctrl_dumppolicy()
1600 		nla_nest_end(skb, nest);  in ctrl_dumppolicy()
1605 	return skb->len;  in ctrl_dumppolicy()
1609 	return skb->len;  in ctrl_dumppolicy()
1614 	struct ctrl_dump_policy_ctx *ctx = (void *)cb->ctx;  in ctrl_dumppolicy_done()
1616 	kfree(ctx->op_iter);  in ctrl_dumppolicy_done()
1617 	netlink_policy_dump_free(ctx->state);  in ctrl_dumppolicy_done()
1626 		.maxattr	= ARRAY_SIZE(ctrl_policy_family) - 1,
1634 		.maxattr	= ARRAY_SIZE(ctrl_policy_family) - 1,
1641 		.maxattr	= ARRAY_SIZE(ctrl_policy_policy) - 1,
1678 		if (family->n_mcgrps == 0)  in genl_bind()
1681 		i = group - family->mcgrp_offset;  in genl_bind()
1682 		if (i < 0 || i >= family->n_mcgrps)  in genl_bind()
1685 		grp = &family->mcgrps[i];  in genl_bind()
1686 		if ((grp->flags & GENL_UNS_ADMIN_PERM) &&  in genl_bind()
1687 		    !ns_capable(net->user_ns, CAP_NET_ADMIN))  in genl_bind()
1688 			ret = -EPERM;  in genl_bind()
1689 		if (grp->cap_sys_admin &&  in genl_bind()
1690 		    !ns_capable(net->user_ns, CAP_SYS_ADMIN))  in genl_bind()
1691 			ret = -EPERM;  in genl_bind()
1709 	net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, &cfg);  in genl_pernet_init()
1711 	if (!net->genl_sock && net_eq(net, &init_net))  in genl_pernet_init()
1714 	if (!net->genl_sock)  in genl_pernet_init()
1715 		return -ENOMEM;  in genl_pernet_init()
1722 	netlink_kernel_release(net->genl_sock);  in genl_pernet_exit()
1723 	net->genl_sock = NULL;  in genl_pernet_exit()
1763 				err = -ENOMEM;  in genlmsg_mcast()
1766 			err = nlmsg_multicast(prev->genl_sock, tmp,  in genlmsg_mcast()
1770 			else if (err != -ESRCH)  in genlmsg_mcast()
1776 	err = nlmsg_multicast(prev->genl_sock, skb, portid, group, GFP_ATOMIC);  in genlmsg_mcast()
1782 	else if (err != -ESRCH)  in genlmsg_mcast()
1784 	return delivered ? 0 : -ESRCH;  in genlmsg_mcast()
1796 	if (WARN_ON_ONCE(group >= family->n_mcgrps))  in genlmsg_multicast_allns()
1797 		return -EINVAL;  in genlmsg_multicast_allns()
1799 	group = family->mcgrp_offset + group;  in genlmsg_multicast_allns()
1808 	struct sock *sk = net->genl_sock;  in genl_notify()
1810 	if (WARN_ON_ONCE(group >= family->n_mcgrps))  in genl_notify()
1813 	group = family->mcgrp_offset + group;  in genl_notify()
1814 	nlmsg_notify(sk, skb, info->snd_portid, group,  in genl_notify()
1815 		     nlmsg_report(info->nlhdr), flags);  in genl_notify()