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authorXin Long <lucien.xin@gmail.com>2018-06-28 15:31:00 +0800
committerDavid S. Miller <davem@davemloft.net>2018-06-29 22:20:55 +0900
commitb0e9a2fe3ff971950833bc0ffc383babd9443bc4 (patch)
tree05d1ad617d3fc18a8030eddaf6dadc1f8aa9a5f1 /include/net/sctp
parent23c94d63a7e395c5706f7d9edde1ff839b050c5f (diff)
sctp: add support for SCTP_REUSE_PORT sockopt
This feature is actually already supported by sk->sk_reuse which can be set by socket level opt SO_REUSEADDR. But it's not working exactly as RFC6458 demands in section 8.1.27, like: - This option only supports one-to-one style SCTP sockets - This socket option must not be used after calling bind() or sctp_bindx(). Besides, SCTP_REUSE_PORT sockopt should be provided for user's programs. Otherwise, the programs with SCTP_REUSE_PORT from other systems will not work in linux. To separate it from the socket level version, this patch adds 'reuse' in sctp_sock and it works pretty much as sk->sk_reuse, but with some extra setup limitations that are needed when it is being enabled. "It should be noted that the behavior of the socket-level socket option to reuse ports and/or addresses for SCTP sockets is unspecified", so it leaves SO_REUSEADDR as is for the compatibility. Note that the name SCTP_REUSE_PORT is somewhat confusing, as its functionality is nearly identical to SO_REUSEADDR, but with some extra restrictions. Here it uses 'reuse' in sctp_sock instead of 'reuseport'. As for sk->sk_reuseport support for SCTP, it will be added in another patch. Thanks to Neil to make this clear. v1->v2: - add sctp_sk->reuse to separate it from the socket level version. v2->v3: - improve changelog according to Marcelo's suggestion. Acked-by: Neil Horman <nhorman@tuxdriver.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/sctp')
-rw-r--r--include/net/sctp/structs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index e0f962d27386..701a51736fa5 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -220,6 +220,7 @@ struct sctp_sock {
__u32 adaptation_ind;
__u32 pd_point;
__u16 nodelay:1,
+ reuse:1,
disable_fragments:1,
v4mapped:1,
frag_interleave:1,