1 // SPDX-License-Identifier: GPL-2.0-or-later
70 	int	ishost = !net->ipv6.devconf_all->forwarding;  in ipv6_sock_ac_join()
75 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))  in ipv6_sock_ac_join()
76 		return -EPERM;  in ipv6_sock_ac_join()
78 		return -EINVAL;  in ipv6_sock_ac_join()
84 		return -EINVAL;  in ipv6_sock_ac_join()
88 		return -ENOMEM;  in ipv6_sock_ac_join()
89 	pac->acl_next = NULL;  in ipv6_sock_ac_join()
90 	pac->acl_addr = *addr;  in ipv6_sock_ac_join()
97 			dev = rt->dst.dev;  in ipv6_sock_ac_join()
100 			err = -EADDRNOTAVAIL;  in ipv6_sock_ac_join()
110 		err = -ENODEV;  in ipv6_sock_ac_join()
117 			err = -ENODEV;  in ipv6_sock_ac_join()
119 			err = -EADDRNOTAVAIL;  in ipv6_sock_ac_join()
123 	ishost = !idev->cnf.forwarding;  in ipv6_sock_ac_join()
125 	pac->acl_ifindex = dev->ifindex;  in ipv6_sock_ac_join()
128 	 * For hosts, allow link-local or matching prefix anycasts.  in ipv6_sock_ac_join()
130 	 * still allowing some non-router anycast participation.  in ipv6_sock_ac_join()
134 			err = -EADDRNOTAVAIL;  in ipv6_sock_ac_join()
141 		pac->acl_next = np->ipv6_ac_list;  in ipv6_sock_ac_join()
142 		np->ipv6_ac_list = pac;  in ipv6_sock_ac_join()
165 	for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) {  in ipv6_sock_ac_drop()
166 		if ((ifindex == 0 || pac->acl_ifindex == ifindex) &&  in ipv6_sock_ac_drop()
167 		     ipv6_addr_equal(&pac->acl_addr, addr))  in ipv6_sock_ac_drop()
172 		return -ENOENT;  in ipv6_sock_ac_drop()
174 		prev_pac->acl_next = pac->acl_next;  in ipv6_sock_ac_drop()
176 		np->ipv6_ac_list = pac->acl_next;  in ipv6_sock_ac_drop()
178 	dev = __dev_get_by_index(net, pac->acl_ifindex);  in ipv6_sock_ac_drop()
180 		ipv6_dev_ac_dec(dev, &pac->acl_addr);  in ipv6_sock_ac_drop()
195 	pac = np->ipv6_ac_list;  in __ipv6_sock_ac_close()
196 	np->ipv6_ac_list = NULL;  in __ipv6_sock_ac_close()
200 		struct ipv6_ac_socklist *next = pac->acl_next;  in __ipv6_sock_ac_close()
202 		if (pac->acl_ifindex != prev_index) {  in __ipv6_sock_ac_close()
203 			dev = __dev_get_by_index(net, pac->acl_ifindex);  in __ipv6_sock_ac_close()
204 			prev_index = pac->acl_ifindex;  in __ipv6_sock_ac_close()
207 			ipv6_dev_ac_dec(dev, &pac->acl_addr);  in __ipv6_sock_ac_close()
217 	if (!np->ipv6_ac_list)  in ipv6_sock_ac_close()
226 	unsigned int hash = inet6_acaddr_hash(net, &aca->aca_addr);  in ipv6_add_acaddr_hash()
229 	hlist_add_head_rcu(&aca->aca_addr_lst, &inet6_acaddr_lst[hash]);  in ipv6_add_acaddr_hash()
236 	hlist_del_init_rcu(&aca->aca_addr_lst);  in ipv6_del_acaddr_hash()
242 	refcount_inc(&aca->aca_refcnt);  in aca_get()
249 	fib6_info_release(aca->aca_rt);  in aca_free_rcu()
255 	if (refcount_dec_and_test(&ac->aca_refcnt)) {  in aca_put()
256 		call_rcu(&ac->rcu, aca_free_rcu);  in aca_put()
269 	aca->aca_addr = *addr;  in aca_alloc()
271 	aca->aca_rt = f6i;  in aca_alloc()
272 	INIT_HLIST_NODE(&aca->aca_addr_lst);  in aca_alloc()
273 	aca->aca_users = 1;  in aca_alloc()
275 	aca->aca_cstamp = aca->aca_tstamp = jiffies;  in aca_alloc()
276 	refcount_set(&aca->aca_refcnt, 1);  in aca_alloc()
293 	write_lock_bh(&idev->lock);  in __ipv6_dev_ac_inc()
294 	if (idev->dead) {  in __ipv6_dev_ac_inc()
295 		err = -ENODEV;  in __ipv6_dev_ac_inc()
299 	for (aca = idev->ac_list; aca; aca = aca->aca_next) {  in __ipv6_dev_ac_inc()
300 		if (ipv6_addr_equal(&aca->aca_addr, addr)) {  in __ipv6_dev_ac_inc()
301 			aca->aca_users++;  in __ipv6_dev_ac_inc()
307 	net = dev_net(idev->dev);  in __ipv6_dev_ac_inc()
316 		err = -ENOMEM;  in __ipv6_dev_ac_inc()
320 	aca->aca_next = idev->ac_list;  in __ipv6_dev_ac_inc()
321 	idev->ac_list = aca;  in __ipv6_dev_ac_inc()
324 	 * it is already exposed via idev->ac_list.  in __ipv6_dev_ac_inc()
327 	write_unlock_bh(&idev->lock);  in __ipv6_dev_ac_inc()
333 	addrconf_join_solict(idev->dev, &aca->aca_addr);  in __ipv6_dev_ac_inc()
338 	write_unlock_bh(&idev->lock);  in __ipv6_dev_ac_inc()
351 	write_lock_bh(&idev->lock);  in __ipv6_dev_ac_dec()
353 	for (aca = idev->ac_list; aca; aca = aca->aca_next) {  in __ipv6_dev_ac_dec()
354 		if (ipv6_addr_equal(&aca->aca_addr, addr))  in __ipv6_dev_ac_dec()
359 		write_unlock_bh(&idev->lock);  in __ipv6_dev_ac_dec()
360 		return -ENOENT;  in __ipv6_dev_ac_dec()
362 	if (--aca->aca_users > 0) {  in __ipv6_dev_ac_dec()
363 		write_unlock_bh(&idev->lock);  in __ipv6_dev_ac_dec()
367 		prev_aca->aca_next = aca->aca_next;  in __ipv6_dev_ac_dec()
369 		idev->ac_list = aca->aca_next;  in __ipv6_dev_ac_dec()
370 	write_unlock_bh(&idev->lock);  in __ipv6_dev_ac_dec()
372 	addrconf_leave_solict(idev, &aca->aca_addr);  in __ipv6_dev_ac_dec()
374 	ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);  in __ipv6_dev_ac_dec()
386 		return -ENODEV;  in ipv6_dev_ac_dec()
394 	write_lock_bh(&idev->lock);  in ipv6_ac_destroy_dev()
395 	while ((aca = idev->ac_list) != NULL) {  in ipv6_ac_destroy_dev()
396 		idev->ac_list = aca->aca_next;  in ipv6_ac_destroy_dev()
397 		write_unlock_bh(&idev->lock);  in ipv6_ac_destroy_dev()
401 		addrconf_leave_solict(idev, &aca->aca_addr);  in ipv6_ac_destroy_dev()
403 		ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);  in ipv6_ac_destroy_dev()
407 		write_lock_bh(&idev->lock);  in ipv6_ac_destroy_dev()
409 	write_unlock_bh(&idev->lock);  in ipv6_ac_destroy_dev()
423 		read_lock_bh(&idev->lock);  in ipv6_chk_acast_dev()
424 		for (aca = idev->ac_list; aca; aca = aca->aca_next)  in ipv6_chk_acast_dev()
425 			if (ipv6_addr_equal(&aca->aca_addr, addr))  in ipv6_chk_acast_dev()
427 		read_unlock_bh(&idev->lock);  in ipv6_chk_acast_dev()
451 			nh_dev = fib6_info_nh_dev(aca->aca_rt);  in ipv6_chk_acast_addr()
454 			if (ipv6_addr_equal(&aca->aca_addr, addr)) {  in ipv6_chk_acast_addr()
464 /*	check if this anycast address is link-local on given interface or
483 #define ac6_seq_private(seq)	((struct ac6_iter_state *)(seq)->private)
487 	struct ifacaddr6 *im = NULL;  in ac6_get_first()  local
491 	state->idev = NULL;  in ac6_get_first()
492 	for_each_netdev_rcu(net, state->dev) {  in ac6_get_first()
494 		idev = __in6_dev_get(state->dev);  in ac6_get_first()
497 		read_lock_bh(&idev->lock);  in ac6_get_first()
498 		im = idev->ac_list;  in ac6_get_first()
499 		if (im) {  in ac6_get_first()
500 			state->idev = idev;  in ac6_get_first()
503 		read_unlock_bh(&idev->lock);  in ac6_get_first()
505 	return im;  in ac6_get_first()
508 static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im)  in ac6_get_next()  argument
512 	im = im->aca_next;  in ac6_get_next()
513 	while (!im) {  in ac6_get_next()
514 		if (likely(state->idev != NULL))  in ac6_get_next()
515 			read_unlock_bh(&state->idev->lock);  in ac6_get_next()
517 		state->dev = next_net_device_rcu(state->dev);  in ac6_get_next()
518 		if (!state->dev) {  in ac6_get_next()
519 			state->idev = NULL;  in ac6_get_next()
522 		state->idev = __in6_dev_get(state->dev);  in ac6_get_next()
523 		if (!state->idev)  in ac6_get_next()
525 		read_lock_bh(&state->idev->lock);  in ac6_get_next()
526 		im = state->idev->ac_list;  in ac6_get_next()
528 	return im;  in ac6_get_next()
533 	struct ifacaddr6 *im = ac6_get_first(seq);  in ac6_get_idx()  local
534 	if (im)  in ac6_get_idx()
535 		while (pos && (im = ac6_get_next(seq, im)) != NULL)  in ac6_get_idx()
536 			--pos;  in ac6_get_idx()
537 	return pos ? NULL : im;  in ac6_get_idx()
549 	struct ifacaddr6 *im = ac6_get_next(seq, v);  in ac6_seq_next()  local
552 	return im;  in ac6_seq_next()
560 	if (likely(state->idev != NULL)) {  in ac6_seq_stop()
561 		read_unlock_bh(&state->idev->lock);  in ac6_seq_stop()
562 		state->idev = NULL;  in ac6_seq_stop()
569 	struct ifacaddr6 *im = (struct ifacaddr6 *)v;  in ac6_seq_show()  local
572 	seq_printf(seq, "%-4d %-15s %pi6 %5d\n",  in ac6_seq_show()
573 		   state->dev->ifindex, state->dev->name,  in ac6_seq_show()
574 		   &im->aca_addr, im->aca_users);  in ac6_seq_show()
587 	if (!proc_create_net("anycast6", 0444, net->proc_net, &ac6_seq_ops,  in ac6_proc_init()
589 		return -ENOMEM;  in ac6_proc_init()
596 	remove_proc_entry("anycast6", net->proc_net);  in ac6_proc_exit()