Merge branch 'sctp-vrf'

Xin Long says:

====================
sctp: support vrf processing

This patchset adds the VRF processing in SCTP. Simliar to TCP/UDP,
it includes socket bind and socket/association lookup changes.

For socket bind change, it allows sockets to bind to a VRF device
and allows multiple sockets with the same IP and PORT to bind to
different interfaces in patch 1-3.

For socket/association lookup change, it adds dif and sdif check
in both asoc and ep lookup in patch 4 and 5, and when binding to
nodev, users can decide if accept the packets received from one
l3mdev by setup a sysctl option in patch 6.

Note with VRF support, in a netns, an association will be decided
by src ip + src port + dst ip + dst port + bound_dev_if, and it's
possible for ss to have:

  State       Local Address:Port      Peer Address:Port
   ESTAB     192.168.1.2%vrf-s1:1234
   `- ESTAB   192.168.1.2%veth1:1234   192.168.1.1:1234
   ESTAB     192.168.1.2%vrf-s2:1234
   `- ESTAB   192.168.1.2%veth2:1234   192.168.1.1:1234

See the selftest in patch 7 for more usage.

Also, thanks Carlo for testing this patch series on their use.

v1->v2:
  - In Patch 5, move sctp_sk_bound_dev_eq() definition to net/sctp/
    input.c to avoid a build error when IP_SCTP is disabled, as Paolo
    suggested.
  - In Patch 7, avoid one sleep by disabling the IPv6 dad, and remove
    another sleep by using ss to check if the server's ready, and also
    delete two unncessary sleeps in sctp_hello.c, as Paolo suggested.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 14 insertions, 5 deletions

diff --git a/include/net/netns/sctp.h b/include/net/netns/sctp.h
index a681147aecd8..7eff3d981b89 100644
--- a/include/net/netns/sctp.h
+++ b/include/net/netns/sctp.h
@@ -175,6 +175,10 @@ struct netns_sctp {
 
 	/* Threshold for autoclose timeout, in seconds. */
 	unsigned long max_autoclose;
+
+#ifdef CONFIG_NET_L3_MASTER_DEV
+	int l3mdev_accept;
+#endif
 };
 
 #endif /* __NETNS_SCTP_H__ */
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 01d904b34cf0..c335dd01a597 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -109,7 +109,7 @@ struct sctp_transport *sctp_transport_get_idx(struct net *net,
 			struct rhashtable_iter *iter, int pos);
 int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
 				  const union sctp_addr *laddr,
-				  const union sctp_addr *paddr, void *p);
+				  const union sctp_addr *paddr, void *p, int dif);
 int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
 				    struct net *net, int *pos, void *p);
 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p);
@@ -157,10 +157,12 @@ void sctp_unhash_transport(struct sctp_transport *t);
 struct sctp_transport *sctp_addrs_lookup_transport(
 				struct net *net,
 				const union sctp_addr *laddr,
-				const union sctp_addr *paddr);
+				const union sctp_addr *paddr,
+				int dif, int sdif);
 struct sctp_transport *sctp_epaddr_lookup_transport(
 				const struct sctp_endpoint *ep,
 				const union sctp_addr *paddr);
+bool sctp_sk_bound_dev_eq(struct net *net, int bound_dev_if, int dif, int sdif);
 
 /*
  * sctp/proc.c
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 350f250b0dc7..afa3781e3ca2 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -477,6 +477,7 @@ struct sctp_af {
 	int		(*available)	(union sctp_addr *,
 					 struct sctp_sock *);
 	int		(*skb_iif)	(const struct sk_buff *sk);
+	int		(*skb_sdif)(const struct sk_buff *sk);
 	int		(*is_ce)	(const struct sk_buff *sk);
 	void		(*seq_dump_addr)(struct seq_file *seq,
 					 union sctp_addr *addr);
@@ -1378,10 +1379,12 @@ struct sctp_association *sctp_endpoint_lookup_assoc(
 	struct sctp_transport **);
 bool sctp_endpoint_is_peeled_off(struct sctp_endpoint *ep,
 				 const union sctp_addr *paddr);
-struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *,
-					struct net *, const union sctp_addr *);
+struct sctp_endpoint *sctp_endpoint_is_match(struct sctp_endpoint *ep,
+					     struct net *net,
+					     const union sctp_addr *laddr,
+					     int dif, int sdif);
 bool sctp_has_association(struct net *net, const union sctp_addr *laddr,
-			  const union sctp_addr *paddr);
+			  const union sctp_addr *paddr, int dif, int sdif);
 
 int sctp_verify_init(struct net *net, const struct sctp_endpoint *ep,
 		     const struct sctp_association *asoc,