sctp: Add Auto-ASCONF support (core).

SCTP reconfigure the IP addresses in the association by using
ASCONF chunks as mentioned in RFC5061.  For example, we can
start to use the newly configured IP address in the existing
association.  This patch implements automatic ASCONF operation
in the SCTP stack with address events in the host computer,
which is called auto_asconf.

Signed-off-by: Michio Honda <micchie@sfc.wide.ad.jp>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 17 insertions, 0 deletions

diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 0037e28e80e..f9fe374ac9f 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -120,6 +120,7 @@ extern int sctp_copy_local_addr_list(struct sctp_bind_addr *,
                                      int flags);
 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
+extern void sctp_addr_wq_mgmt(struct sctp_sockaddr_entry *, int);
 
 /*
  * sctp/socket.c
@@ -134,6 +135,7 @@ void sctp_sock_rfree(struct sk_buff *skb);
 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
                     struct sctp_association *asoc);
 extern struct percpu_counter sctp_sockets_allocated;
+extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
 
 /*
  * sctp/primitive.c
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 7df327a6d56..cd8c929e6b0 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -205,6 +205,11 @@ extern struct sctp_globals {
          * It is a list of sctp_sockaddr_entry.
          */
         struct list_head local_addr_list;
+        int default_auto_asconf;
+        struct list_head addr_waitq;
+        struct timer_list addr_wq_timer;
+        struct list_head auto_asconf_splist;
+        spinlock_t addr_wq_lock;
 
         /* Lock that protects the local_addr_list writers */
         spinlock_t addr_list_lock;
@@ -264,6 +269,11 @@ extern struct sctp_globals {
 #define sctp_port_hashtable             (sctp_globals.port_hashtable)
 #define sctp_local_addr_list            (sctp_globals.local_addr_list)
 #define sctp_local_addr_lock            (sctp_globals.addr_list_lock)
+#define sctp_auto_asconf_splist         (sctp_globals.auto_asconf_splist)
+#define sctp_addr_waitq                 (sctp_globals.addr_waitq)
+#define sctp_addr_wq_timer              (sctp_globals.addr_wq_timer)
+#define sctp_addr_wq_lock               (sctp_globals.addr_wq_lock)
+#define sctp_default_auto_asconf        (sctp_globals.default_auto_asconf)
 #define sctp_scope_policy               (sctp_globals.ipv4_scope_policy)
 #define sctp_addip_enable               (sctp_globals.addip_enable)
 #define sctp_addip_noauth               (sctp_globals.addip_noauth_enable)
@@ -341,6 +351,8 @@ struct sctp_sock {
         atomic_t pd_mode;
         /* Receive to here while partial delivery is in effect. */
         struct sk_buff_head pd_lobby;
+        struct list_head auto_asconf_list;
+        int do_auto_asconf;
 };
 
 static inline struct sctp_sock *sctp_sk(const struct sock *sk)
@@ -792,6 +804,8 @@ struct sctp_sockaddr_entry {
         __u8 valid;
 };
 
+#define SCTP_ADDRESS_TICK_DELAY 500
+
 typedef struct sctp_chunk *(sctp_packet_phandler_t)(struct sctp_association *);
 
 /* This structure holds lists of chunks as we are assembling for
@@ -1236,6 +1250,7 @@ sctp_scope_t sctp_scope(const union sctp_addr *);
 int sctp_in_scope(const union sctp_addr *addr, const sctp_scope_t scope);
 int sctp_is_any(struct sock *sk, const union sctp_addr *addr);
 int sctp_addr_is_valid(const union sctp_addr *addr);
+int sctp_is_ep_boundall(struct sock *sk);
 
 
 /* What type of endpoint?  */