3  * NETLINK      Generic Netlink Family
70  * also abused this API and relied on family == group ID, we
71  * cater to that by giving it a static family and group ID.
87 static int genl_ctrl_event(int event, const struct genl_family *family,
92 genl_op_fill_in_reject_policy(const struct genl_family *family,  in genl_op_fill_in_reject_policy()  argument
97 	if (op->policy || op->cmd < family->resv_start_op)  in genl_op_fill_in_reject_policy()
111 	const struct genl_family *family;  in genl_family_find_byname()  local
114 	idr_for_each_entry(&genl_fam_idr, family, id)  in genl_family_find_byname()
115 		if (strcmp(family->name, name) == 0)  in genl_family_find_byname()
116 			return family;  in genl_family_find_byname()
121 static int genl_get_cmd_cnt(const struct genl_family *family)  in genl_get_cmd_cnt()  argument
123 	return family->n_ops + family->n_small_ops;  in genl_get_cmd_cnt()
126 static void genl_op_from_full(const struct genl_family *family,  in genl_op_from_full()  argument
129 	*op = family->ops[i];  in genl_op_from_full()
132 		op->maxattr = family->maxattr;  in genl_op_from_full()
134 		op->policy = family->policy;  in genl_op_from_full()
136 	genl_op_fill_in_reject_policy(family, op);  in genl_op_from_full()
139 static int genl_get_cmd_full(u32 cmd, const struct genl_family *family,  in genl_get_cmd_full()  argument
144 	for (i = 0; i < family->n_ops; i++)  in genl_get_cmd_full()
145 		if (family->ops[i].cmd == cmd) {  in genl_get_cmd_full()
146 			genl_op_from_full(family, i, op);  in genl_get_cmd_full()
153 static void genl_op_from_small(const struct genl_family *family,  in genl_op_from_small()  argument
157 	op->doit	= family->small_ops[i].doit;  in genl_op_from_small()
158 	op->dumpit	= family->small_ops[i].dumpit;  in genl_op_from_small()
159 	op->cmd		= family->small_ops[i].cmd;  in genl_op_from_small()
160 	op->internal_flags = family->small_ops[i].internal_flags;  in genl_op_from_small()
161 	op->flags	= family->small_ops[i].flags;  in genl_op_from_small()
162 	op->validate	= family->small_ops[i].validate;  in genl_op_from_small()
164 	op->maxattr = family->maxattr;  in genl_op_from_small()
165 	op->policy = family->policy;  in genl_op_from_small()
167 	genl_op_fill_in_reject_policy(family, op);  in genl_op_from_small()
170 static int genl_get_cmd_small(u32 cmd, const struct genl_family *family,  in genl_get_cmd_small()  argument
175 	for (i = 0; i < family->n_small_ops; i++)  in genl_get_cmd_small()
176 		if (family->small_ops[i].cmd == cmd) {  in genl_get_cmd_small()
177 			genl_op_from_small(family, i, op);  in genl_get_cmd_small()
184 static int genl_get_cmd(u32 cmd, const struct genl_family *family,  in genl_get_cmd()  argument
187 	if (!genl_get_cmd_full(cmd, family, op))  in genl_get_cmd()
189 	return genl_get_cmd_small(cmd, family, op);  in genl_get_cmd()
193 				  const struct genl_family *family,  in genl_get_cmd_by_index()  argument
196 	if (i < family->n_ops)  in genl_get_cmd_by_index()
197 		genl_op_from_full(family, i, op);  in genl_get_cmd_by_index()
198 	else if (i < family->n_ops + family->n_small_ops)  in genl_get_cmd_by_index()
199 		genl_op_from_small(family, i - family->n_ops, op);  in genl_get_cmd_by_index()
266 static int genl_validate_assign_mc_groups(struct genl_family *family)  in genl_validate_assign_mc_groups()  argument
269 	int n_groups = family->n_mcgrps;  in genl_validate_assign_mc_groups()
277 		const struct genl_multicast_group *grp = &family->mcgrps[i];  in genl_validate_assign_mc_groups()
286 	if (family == &genl_ctrl) {  in genl_validate_assign_mc_groups()
289 	} else if (strcmp(family->name, "NET_DM") == 0) {  in genl_validate_assign_mc_groups()
292 	} else if (family->id == GENL_ID_VFS_DQUOT) {  in genl_validate_assign_mc_groups()
295 	} else if (family->id == GENL_ID_PMCRAID) {  in genl_validate_assign_mc_groups()
305 	family->mcgrp_offset = first_id;  in genl_validate_assign_mc_groups()
311 	if (family->netnsok) {  in genl_validate_assign_mc_groups()
337 		for (i = 0; i < family->n_mcgrps; i++)  in genl_validate_assign_mc_groups()
338 			clear_bit(family->mcgrp_offset + i, mc_groups);  in genl_validate_assign_mc_groups()
344 static void genl_unregister_mc_groups(const struct genl_family *family)  in genl_unregister_mc_groups()  argument
352 		for (i = 0; i < family->n_mcgrps; i++)  in genl_unregister_mc_groups()
354 				net->genl_sock, family->mcgrp_offset + i);  in genl_unregister_mc_groups()
359 	for (i = 0; i < family->n_mcgrps; i++) {  in genl_unregister_mc_groups()
360 		int grp_id = family->mcgrp_offset + i;  in genl_unregister_mc_groups()
364 		genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, family,  in genl_unregister_mc_groups()
365 				&family->mcgrps[i], grp_id);  in genl_unregister_mc_groups()
369 static int genl_validate_ops(const struct genl_family *family)  in genl_validate_ops()  argument
373 	if (WARN_ON(family->n_ops && !family->ops) ||  in genl_validate_ops()
374 	    WARN_ON(family->n_small_ops && !family->small_ops))  in genl_validate_ops()
377 	for (i = 0; i < genl_get_cmd_cnt(family); i++) {  in genl_validate_ops()
380 		genl_get_cmd_by_index(i, family, &op);  in genl_validate_ops()
383 		if (WARN_ON(op.cmd >= family->resv_start_op && op.validate))  in genl_validate_ops()
385 		for (j = i + 1; j < genl_get_cmd_cnt(family); j++) {  in genl_validate_ops()
388 			genl_get_cmd_by_index(j, family, &op2);  in genl_validate_ops()
398  * genl_register_family - register a generic netlink family
399  * @family: generic netlink family
401  * Registers the specified family after validating it first. Only one
402  * family may be registered with the same family name or identifier.
404  * The family's ops, multicast groups and module pointer must already
409 int genl_register_family(struct genl_family *family)  in genl_register_family()  argument
414 	err = genl_validate_ops(family);  in genl_register_family()
420 	if (genl_family_find_byname(family->name)) {  in genl_register_family()
428 	 * and having used their family ID also as their  in genl_register_family()
432 	if (family == &genl_ctrl) {  in genl_register_family()
433 		/* and this needs to be special for initial family lookups */  in genl_register_family()
435 	} else if (strcmp(family->name, "pmcraid") == 0) {  in genl_register_family()
437 	} else if (strcmp(family->name, "VFS_DQUOT") == 0) {  in genl_register_family()
441 	family->id = idr_alloc_cyclic(&genl_fam_idr, family,  in genl_register_family()
443 	if (family->id < 0) {  in genl_register_family()
444 		err = family->id;  in genl_register_family()
448 	err = genl_validate_assign_mc_groups(family);  in genl_register_family()
455 	genl_ctrl_event(CTRL_CMD_NEWFAMILY, family, NULL, 0);  in genl_register_family()
456 	for (i = 0; i < family->n_mcgrps; i++)  in genl_register_family()
457 		genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, family,  in genl_register_family()
458 				&family->mcgrps[i], family->mcgrp_offset + i);  in genl_register_family()
463 	idr_remove(&genl_fam_idr, family->id);  in genl_register_family()
471  * genl_unregister_family - unregister generic netlink family
472  * @family: generic netlink family
474  * Unregisters the specified family.
478 int genl_unregister_family(const struct genl_family *family)  in genl_unregister_family()  argument
482 	if (!genl_family_find_byid(family->id)) {  in genl_unregister_family()
487 	genl_unregister_mc_groups(family);  in genl_unregister_family()
489 	idr_remove(&genl_fam_idr, family->id);  in genl_unregister_family()
496 	genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0);  in genl_unregister_family()
507  * @family: generic netlink family
514 		  const struct genl_family *family, int flags, u8 cmd)  in genlmsg_put()  argument
519 	nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN +  in genlmsg_put()
520 			family->hdrsize, flags);  in genlmsg_put()
526 	hdr->version = family->version;  in genlmsg_put()
544 genl_family_rcv_msg_attrs_parse(const struct genl_family *family,  in genl_family_rcv_msg_attrs_parse()  argument
580 	const struct genl_family *family;  member
601 	attrs = genl_family_rcv_msg_attrs_parse(ctx->family, ctx->nlh, ctx->extack,  in genl_start()
613 	info->family = ctx->family;  in genl_start()
619 		if (!ctx->family->parallel_ops)  in genl_start()
622 		if (!ctx->family->parallel_ops)  in genl_start()
674 static int genl_family_rcv_msg_dumpit(const struct genl_family *family,  in genl_family_rcv_msg_dumpit()  argument
687 	ctx.family = family;  in genl_family_rcv_msg_dumpit()
693 	if (!family->parallel_ops) {  in genl_family_rcv_msg_dumpit()
695 			.module = family->module,  in genl_family_rcv_msg_dumpit()
707 			.module = family->module,  in genl_family_rcv_msg_dumpit()
720 static int genl_family_rcv_msg_doit(const struct genl_family *family,  in genl_family_rcv_msg_doit()  argument
734 	attrbuf = genl_family_rcv_msg_attrs_parse(family, nlh, extack,  in genl_family_rcv_msg_doit()
750 	if (family->pre_doit) {  in genl_family_rcv_msg_doit()
751 		err = family->pre_doit(ops, skb, &info);  in genl_family_rcv_msg_doit()
758 	if (family->post_doit)  in genl_family_rcv_msg_doit()
759 		family->post_doit(ops, skb, &info);  in genl_family_rcv_msg_doit()
767 static int genl_header_check(const struct genl_family *family,  in genl_header_check()  argument
774 	if (hdr->cmd < family->resv_start_op)  in genl_header_check()
797 static int genl_family_rcv_msg(const struct genl_family *family,  in genl_family_rcv_msg()  argument
807 	/* this family doesn't exist in this netns */  in genl_family_rcv_msg()
808 	if (!family->netnsok && !net_eq(net, &init_net))  in genl_family_rcv_msg()
811 	hdrlen = GENL_HDRLEN + family->hdrsize;  in genl_family_rcv_msg()
815 	if (genl_header_check(family, nlh, hdr, extack))  in genl_family_rcv_msg()
818 	if (genl_get_cmd(hdr->cmd, family, &op))  in genl_family_rcv_msg()
830 		return genl_family_rcv_msg_dumpit(family, skb, nlh, extack,  in genl_family_rcv_msg()
833 		return genl_family_rcv_msg_doit(family, skb, nlh, extack,  in genl_family_rcv_msg()
840 	const struct genl_family *family;  in genl_rcv_msg()  local
843 	family = genl_family_find_byid(nlh->nlmsg_type);  in genl_rcv_msg()
844 	if (family == NULL)  in genl_rcv_msg()
847 	if (!family->parallel_ops)  in genl_rcv_msg()
850 	err = genl_family_rcv_msg(family, skb, nlh, extack);  in genl_rcv_msg()
852 	if (!family->parallel_ops)  in genl_rcv_msg()
871 static int ctrl_fill_info(const struct genl_family *family, u32 portid, u32 seq,  in ctrl_fill_info()  argument
880 	if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||  in ctrl_fill_info()
881 	    nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) ||  in ctrl_fill_info()
882 	    nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) ||  in ctrl_fill_info()
883 	    nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) ||  in ctrl_fill_info()
884 	    nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr))  in ctrl_fill_info()
887 	if (genl_get_cmd_cnt(family)) {  in ctrl_fill_info()
895 		for (i = 0; i < genl_get_cmd_cnt(family); i++) {  in ctrl_fill_info()
900 			genl_get_cmd_by_index(i, family, &op);  in ctrl_fill_info()
923 	if (family->n_mcgrps) {  in ctrl_fill_info()
931 		for (i = 0; i < family->n_mcgrps; i++) {  in ctrl_fill_info()
935 			grp = &family->mcgrps[i];  in ctrl_fill_info()
942 					family->mcgrp_offset + i) ||  in ctrl_fill_info()
960 static int ctrl_fill_mcgrp_info(const struct genl_family *family,  in ctrl_fill_mcgrp_info()  argument
973 	if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||  in ctrl_fill_mcgrp_info()
974 	    nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id))  in ctrl_fill_mcgrp_info()
1028 static struct sk_buff *ctrl_build_family_msg(const struct genl_family *family,  in ctrl_build_family_msg()  argument
1038 	err = ctrl_fill_info(family, portid, seq, 0, skb, cmd);  in ctrl_build_family_msg()
1048 ctrl_build_mcgrp_msg(const struct genl_family *family,  in ctrl_build_mcgrp_msg()  argument
1059 	err = ctrl_fill_mcgrp_info(family, grp, grp_id, portid,  in ctrl_build_mcgrp_msg()
1096 			request_module("net-pf-%d-proto-%d-family-%s",  in ctrl_getfamily()
1110 		/* family doesn't exist here */  in ctrl_getfamily()
1122 static int genl_ctrl_event(int event, const struct genl_family *family,  in genl_ctrl_event()  argument
1136 		msg = ctrl_build_family_msg(family, 0, 0, event);  in genl_ctrl_event()
1141 		msg = ctrl_build_mcgrp_msg(family, grp, grp_id, 0, 0, event);  in genl_ctrl_event()
1150 	if (!family->netnsok) {  in genl_ctrl_event()
1420 	const struct genl_family *family;  in genl_bind()  local
1426 	idr_for_each_entry(&genl_fam_idr, family, id) {  in genl_bind()
1430 		if (family->n_mcgrps == 0)  in genl_bind()
1433 		i = group - family->mcgrp_offset;  in genl_bind()
1434 		if (i < 0 || i >= family->n_mcgrps)  in genl_bind()
1437 		grp = &family->mcgrps[i];  in genl_bind()
1537 int genlmsg_multicast_allns(const struct genl_family *family,  in genlmsg_multicast_allns()  argument
1541 	if (WARN_ON_ONCE(group >= family->n_mcgrps))  in genlmsg_multicast_allns()
1544 	group = family->mcgrp_offset + group;  in genlmsg_multicast_allns()
1549 void genl_notify(const struct genl_family *family, struct sk_buff *skb,  in genl_notify()  argument
1555 	if (WARN_ON_ONCE(group >= family->n_mcgrps))  in genl_notify()
1558 	group = family->mcgrp_offset + group;  in genl_notify()