sctp: support to lookup with ep+paddr in transport rhashtable
authorXin Long <lucien.xin@gmail.com>
Thu, 14 Jan 2016 05:49:34 +0000 (13:49 +0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 15 Jan 2016 19:41:36 +0000 (14:41 -0500)
commit65a5124a71e85c35fa8d047a471950325855dccf
treef6183f8289a82e6493b591f2cfb7912d1a04c25e
parent628a96e7d3b684baf5584462de32345e997d7dbe
sctp: support to lookup with ep+paddr in transport rhashtable

Now, when we sendmsg, we translate the ep to laddr by selecting the
first element of the list, and then do a lookup for a transport.

But sctp_hash_cmp() will compare it against asoc addr_list, which may
be a subset of ep addr_list, meaning that this chosen laddr may not be
there, and thus making it impossible to find the transport.

So we fix it by using ep + paddr to lookup transports in hashtable. In
sctp_hash_cmp, if .ep is set, we will check if this ep == asoc->ep,
or we will do the laddr check.

Fixes: d6c0256a60e6 ("sctp: add the rhashtable apis for sctp global transport hashtable")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Reported-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/sctp/input.c