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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
35a256fee5 ("ipv6: Nonlocal bind") for IPv6. This commit also allows
IPv6 source address spoofing when non-local bind feature is enabled.

Signed-off-by: Vincent Bernat <vincent@bernat.im>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vincent Bernat 2018-07-25 13:19:13 +02:00 committed by David S. Miller
parent 41627cdb02
commit d0c1f01138
1 changed files with 2 additions and 1 deletions
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3
net/ipv6/datagram.c
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@ -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) &&