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Commit d0c1f011 authored by Vincent Bernat's avatar Vincent Bernat Committed by David S. Miller
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net/ipv6: allow any source address for sendmsg pktinfo with ip_nonlocal_bind 



When freebind feature is set of an IPv6 socket, any source address can
be used when sending UDP datagrams using IPv6 PKTINFO ancillary
message. Global non-local bind feature was added in commit
35a256fe ("ipv6: Nonlocal bind") for IPv6. This commit also allows
IPv6 source address spoofing when non-local bind feature is enabled.

Signed-off-by: default avatarVincent Bernat <vincent@bernat.im>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 41627cdb

net/ipv6/datagram.c

+2 −1
Original line number Diff line number Diff line
@@ -803,7 +803,8 @@ int ip6_datagram_send_ctl(struct net *net, struct sock *sk, 


			if (addr_type != IPV6_ADDR_ANY) {

				int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;

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

				if (!(net->ipv6.sysctl.ip_nonlocal_bind ||

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

				    !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr,

							     dev, !strict, 0,

							     IFA_F_TENTATIVE) &&