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[SCTP]: Fix the bind_addr info during migration.

Browse source 
During accept/migrate the code attempts to copy the addresses from
the parent endpoint to the new endpoint.   However, if the parent
was bound to a wildcard address, then we end up pointlessly copying
all of the current addresses on the system.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2007-12-06 22:50:54 -08:00 committed by David S. Miller
parent f26f7c4805
commit 8e71a11c9f
3 changed files with 31 additions and 10 deletions
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3
include/net/sctp/structs.h
View file

@ -1184,6 +1184,9 @@ int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
const struct sctp_bind_addr *src,
sctp_scope_t scope, gfp_t gfp,
int flags);
int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
const struct sctp_bind_addr *src,
gfp_t gfp);
int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
__u8 use_as_src, gfp_t gfp);
int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);

26
net/sctp/bind_addr.c
View file

@ -105,6 +105,32 @@ out:
return error;
}
/* Exactly duplicate the address lists. This is necessary when doing
* peer-offs and accepts. We don't want to put all the current system
* addresses into the endpoint. That's useless. But we do want duplicat
* the list of bound addresses that the older endpoint used.
*/
int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
const struct sctp_bind_addr *src,
gfp_t gfp)
{
struct sctp_sockaddr_entry *addr;
struct list_head *pos;
int error = 0;
/* All addresses share the same port. */
dest->port = src->port;
list_for_each(pos, &src->address_list) {
addr = list_entry(pos, struct sctp_sockaddr_entry, list);
error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
if (error < 0)
break;
}
return error;
}
/* Initialize the SCTP_bind_addr structure for either an endpoint or
* an association.
*/

12
net/sctp/socket.c
View file

@ -6326,7 +6326,6 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
struct sk_buff *skb, *tmp;
struct sctp_ulpevent *event;
struct sctp_bind_hashbucket *head;
int flags = 0;
/* Migrate socket buffer sizes and all the socket level options to the
* new socket.
@ -6356,15 +6355,8 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
/* Copy the bind_addr list from the original endpoint to the new
* endpoint so that we can handle restarts properly
*/
if (PF_INET6 == assoc->base.sk->sk_family)
flags = SCTP_ADDR6_ALLOWED;
if (assoc->peer.ipv4_address)
flags |= SCTP_ADDR4_PEERSUPP;
if (assoc->peer.ipv6_address)
flags |= SCTP_ADDR6_PEERSUPP;
sctp_bind_addr_copy(&newsp->ep->base.bind_addr,
&oldsp->ep->base.bind_addr,
SCTP_SCOPE_GLOBAL, GFP_KERNEL, flags);
sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
&oldsp->ep->base.bind_addr, GFP_KERNEL);
/* Move any messages in the old socket's receive queue that are for the
* peeled off association to the new socket's receive queue.