net/ipv6/anycast.c

50 #define ac_dereference(a, idev)						\
51 	rcu_dereference_protected(a, lockdep_is_held(&(idev)->lock))
74 	struct inet6_dev *idev;
127 	idev = in6_dev_get(dev);
128 	if (!idev) {
137 	ishost = !READ_ONCE(idev->cnf.forwarding);
153 	err = __ipv6_dev_ac_inc(idev, addr);
161 	in6_dev_put(idev);
332 int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr)
339 	write_lock_bh(&idev->lock);
340 	if (idev->dead) {
345 	for (aca = ac_dereference(idev->ac_list, idev); aca;
346 	     aca = ac_dereference(aca->aca_next, idev)) {
354 	net = dev_net(idev->dev);
355 	f6i = addrconf_f6i_alloc(net, idev, addr, true, GFP_ATOMIC, NULL);
368 	 * it is already exposed via idev->ac_list.
371 	aca->aca_next = idev->ac_list;
372 	rcu_assign_pointer(idev->ac_list, aca);
374 	write_unlock_bh(&idev->lock);
380 	addrconf_join_solict(idev->dev, &aca->aca_addr);
382 	inet6_ifacaddr_notify(idev->dev, aca, RTM_NEWANYCAST);
387 	write_unlock_bh(&idev->lock);
394 int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr)
398 	write_lock_bh(&idev->lock);
400 	for (aca = ac_dereference(idev->ac_list, idev); aca;
401 	     aca = ac_dereference(aca->aca_next, idev)) {
407 		write_unlock_bh(&idev->lock);
411 		write_unlock_bh(&idev->lock);
417 		rcu_assign_pointer(idev->ac_list, aca->aca_next);
418 	write_unlock_bh(&idev->lock);
420 	addrconf_leave_solict(idev, &aca->aca_addr);
422 	ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
424 	inet6_ifacaddr_notify(idev->dev, aca, RTM_DELANYCAST);
432 	struct inet6_dev *idev = in6_dev_get(dev);
435 	if (!idev)
438 	err = __ipv6_dev_ac_dec(idev, addr);
439 	in6_dev_put(idev);
444 void ipv6_ac_destroy_dev(struct inet6_dev *idev)
448 	write_lock_bh(&idev->lock);
449 	while ((aca = ac_dereference(idev->ac_list, idev)) != NULL) {
450 		rcu_assign_pointer(idev->ac_list, aca->aca_next);
451 		write_unlock_bh(&idev->lock);
455 		addrconf_leave_solict(idev, &aca->aca_addr);
457 		ip6_del_rt(dev_net(idev->dev), aca->aca_rt, false);
461 		write_lock_bh(&idev->lock);
463 	write_unlock_bh(&idev->lock);
472 	struct inet6_dev *idev;
475 	idev = __in6_dev_get(dev);
476 	if (idev) {
477 		for (aca = rcu_dereference(idev->ac_list); aca;
544 		struct inet6_dev *idev;
546 		idev = __in6_dev_get(state->dev);
547 		if (!idev)
549 		im = rcu_dereference(idev->ac_list);
559 	struct inet6_dev *idev;
566 		idev = __in6_dev_get(state->dev);
567 		if (!idev)
569 		im = rcu_dereference(idev->ac_list);