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| author | Laszlo Toth <laszlth@gmail.com> | 2017-10-23 19:19:33 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-18 11:30:37 +0100 |
| commit | 574475f09d984238580b85c070e6052f164c778e (patch) | |
| tree | 268094de1f9bca907770b9945c4698dfd18f030b | |
| parent | f9b6f439d879da4b7db31fa30b68ea954f328329 (diff) | |
| download | linux-stable-574475f09d984238580b85c070e6052f164c778e.tar.gz linux-stable-574475f09d984238580b85c070e6052f164c778e.tar.bz2 linux-stable-574475f09d984238580b85c070e6052f164c778e.zip | |
sctp: full support for ipv6 ip_nonlocal_bind & IP_FREEBIND
[ Upstream commit b71d21c274eff20a9db8158882b545b141b73ab8 ]
Commit 9b9742022888 ("sctp: support ipv6 nonlocal bind")
introduced support for the above options as v4 sctp did,
so patched sctp_v6_available().
In the v4 implementation it's enough, because
sctp_inet_bind_verify() just returns with sctp_v4_available().
However sctp_inet6_bind_verify() has an extra check before that
for link-local scope_id, which won't respect the above options.
Added the checks before calling ipv6_chk_addr(), but
not before the validation of scope_id.
before (w/ both options):
./v6test fe80::10 sctp
bind failed, errno: 99 (Cannot assign requested address)
./v6test fe80::10 tcp
bind success, errno: 0 (Success)
after (w/ both options):
./v6test fe80::10 sctp
bind success, errno: 0 (Success)
Signed-off-by: Laszlo Toth <laszlth@gmail.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/sctp/ipv6.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index a4b6ffb61495..1344e3a411ae 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -882,8 +882,10 @@ static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) net = sock_net(&opt->inet.sk); rcu_read_lock(); dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id); - if (!dev || - !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) { + if (!dev || !(opt->inet.freebind || + net->ipv6.sysctl.ip_nonlocal_bind || + ipv6_chk_addr(net, &addr->v6.sin6_addr, + dev, 0))) { rcu_read_unlock(); return 0; } |