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| author | Xin Long <lucien.xin@gmail.com> | 2022-11-16 23:01:17 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-11-18 14:42:54 +0300 |
| commit | 6fe1e52490a91cb23f6b3aafc93e7c5beb99f862 (patch) | |
| tree | da4823cfde9a2407af943aea8cd448be20997919 /net/sctp/ipv6.c | |
| parent | 26943aefa8704ca7871c34a2d1b2b2a418372666 (diff) | |
| download | linux-6fe1e52490a91cb23f6b3aafc93e7c5beb99f862.tar.xz | |
sctp: check ipv6 addr with sk_bound_dev if set
When binding to an ipv6 address, it calls ipv6_chk_addr() to check if
this address is on any dev. If a socket binds to a l3mdev but no dev
is passed to do this check, all l3mdev and slaves will be skipped and
the check will fail.
This patch is to pass the bound_dev to make sure the devices under the
same l3mdev can be returned in ipv6_chk_addr(). When the bound_dev is
not a l3mdev or l3slave, l3mdev_master_dev_rcu() will return NULL in
__ipv6_chk_addr_and_flags(), it will keep compitable with before when
NULL dev was passed.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/ipv6.c')
| -rw-r--r-- | net/sctp/ipv6.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index d081858c2d07..e6274cdbdf6c 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -680,9 +680,11 @@ static int sctp_v6_is_any(const union sctp_addr *addr) /* Should this be available for binding? */ static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) { - int type; - struct net *net = sock_net(&sp->inet.sk); const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr; + struct sock *sk = &sp->inet.sk; + struct net *net = sock_net(sk); + struct net_device *dev = NULL; + int type; type = ipv6_addr_type(in6); if (IPV6_ADDR_ANY == type) @@ -696,8 +698,14 @@ static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) if (!(type & IPV6_ADDR_UNICAST)) return 0; + if (sk->sk_bound_dev_if) { + dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); + if (!dev) + return 0; + } + return ipv6_can_nonlocal_bind(net, &sp->inet) || - ipv6_chk_addr(net, in6, NULL, 0); + ipv6_chk_addr(net, in6, dev, 0); } /* This function checks if the address is a valid address to be used for |