Commit 7c90cc2d authored by FX Le Bail's avatar FX Le Bail Committed by David S. Miller
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ipv6: enable anycast addresses as source addresses for datagrams 



This change allows to consider an anycast address valid as source address
when given via an IPV6_PKTINFO or IPV6_2292PKTINFO ancillary data item.
So, when sending a datagram with ancillary data, the unicast and anycast
addresses are handled in the same way.

- Adds ipv6_chk_acast_addr_src() to check if an anycast address is link-local
  on given interface or is global.
- Uses it in ip6_datagram_send_ctl().

Signed-off-by: default avatarFrancois-Xavier Le Bail <fx.lebail@yahoo.com>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent eb97768a

include/net/addrconf.h

+3 −2
Original line number Diff line number Diff line
@@ -206,7 +206,8 @@ int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr); 
int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr);

bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev,

			 const struct in6_addr *addr);



bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,

			     const struct in6_addr *addr);



/* Device notifier */

int register_inet6addr_notifier(struct notifier_block *nb);

net/ipv6/anycast.c

+11 −0
Original line number Diff line number Diff line
@@ -383,6 +383,17 @@ bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, 
	return found;

}



/*	check if this anycast address is link-local on given interface or

 *	is global

 */

bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev,

			     const struct in6_addr *addr)

{

	return ipv6_chk_acast_addr(net,

				   (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ?

				    dev : NULL),

				   addr);

}



#ifdef CONFIG_PROC_FS

struct ac6_iter_state {

net/ipv6/datagram.c

+3 −1
Original line number Diff line number Diff line
@@ -699,7 +699,9 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 
				int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;

				if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) &&

				    !ipv6_chk_addr(net, &src_info->ipi6_addr,

						   strict ? dev : NULL, 0))

						   strict ? dev : NULL, 0) &&

				    !ipv6_chk_acast_addr_src(net, dev,

							     &src_info->ipi6_addr))

					err = -EINVAL;

				else

					fl6->saddr = src_info->ipi6_addr;

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