[SCTP]: Fix the bind_addr info during migration.
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>
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@ -1184,6 +1184,9 @@ int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
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const struct sctp_bind_addr *src,
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sctp_scope_t scope, gfp_t gfp,
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int flags);
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int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
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const struct sctp_bind_addr *src,
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gfp_t gfp);
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int sctp_add_bind_addr(struct sctp_bind_addr *, union sctp_addr *,
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__u8 use_as_src, gfp_t gfp);
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int sctp_del_bind_addr(struct sctp_bind_addr *, union sctp_addr *);
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@ -105,6 +105,32 @@ out:
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return error;
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}
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/* Exactly duplicate the address lists. This is necessary when doing
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* peer-offs and accepts. We don't want to put all the current system
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* addresses into the endpoint. That's useless. But we do want duplicat
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* the list of bound addresses that the older endpoint used.
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*/
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int sctp_bind_addr_dup(struct sctp_bind_addr *dest,
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const struct sctp_bind_addr *src,
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gfp_t gfp)
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{
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struct sctp_sockaddr_entry *addr;
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struct list_head *pos;
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int error = 0;
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/* All addresses share the same port. */
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dest->port = src->port;
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list_for_each(pos, &src->address_list) {
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addr = list_entry(pos, struct sctp_sockaddr_entry, list);
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error = sctp_add_bind_addr(dest, &addr->a, 1, gfp);
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if (error < 0)
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break;
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}
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return error;
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}
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/* Initialize the SCTP_bind_addr structure for either an endpoint or
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* an association.
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*/
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@ -6326,7 +6326,6 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
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struct sk_buff *skb, *tmp;
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struct sctp_ulpevent *event;
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struct sctp_bind_hashbucket *head;
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int flags = 0;
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/* Migrate socket buffer sizes and all the socket level options to the
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* new socket.
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@ -6356,15 +6355,8 @@ static void sctp_sock_migrate(struct sock *oldsk, struct sock *newsk,
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/* Copy the bind_addr list from the original endpoint to the new
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* endpoint so that we can handle restarts properly
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*/
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if (PF_INET6 == assoc->base.sk->sk_family)
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flags = SCTP_ADDR6_ALLOWED;
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if (assoc->peer.ipv4_address)
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flags |= SCTP_ADDR4_PEERSUPP;
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if (assoc->peer.ipv6_address)
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flags |= SCTP_ADDR6_PEERSUPP;
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sctp_bind_addr_copy(&newsp->ep->base.bind_addr,
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&oldsp->ep->base.bind_addr,
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SCTP_SCOPE_GLOBAL, GFP_KERNEL, flags);
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sctp_bind_addr_dup(&newsp->ep->base.bind_addr,
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&oldsp->ep->base.bind_addr, GFP_KERNEL);
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/* Move any messages in the old socket's receive queue that are for the
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* peeled off association to the new socket's receive queue.
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