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authorXin Long <lucien.xin@gmail.com>2018-11-12 11:27:16 +0100
committerDavid S. Miller <davem@davemloft.net>2018-11-12 18:09:51 +0100
commit76c6d988aeb3c15d57ea0c245a3b5f27802c1fbe (patch)
tree5508ea6085cda96f528f98229a2317536b776bad /net/sctp/bind_addr.c
parentsctp: do reuseport_select_sock in __sctp_rcv_lookup_endpoint (diff)
downloadlinux-76c6d988aeb3c15d57ea0c245a3b5f27802c1fbe.tar.xz
linux-76c6d988aeb3c15d57ea0c245a3b5f27802c1fbe.zip
sctp: add sock_reuseport for the sock in __sctp_hash_endpoint
This is a part of sk_reuseport support for sctp. It defines a helper sctp_bind_addrs_check() to check if the bind_addrs in two socks are matched. It will add sock_reuseport if they are completely matched, and return err if they are partly matched, and alloc sock_reuseport if all socks are not matched at all. It will work until sk_reuseport support is added in sctp_get_port_local() in the next patch. v1->v2: - use 'laddr->valid && laddr2->valid' check instead as Marcelo pointed in sctp_bind_addrs_check(). 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 'net/sctp/bind_addr.c')
-rw-r--r--net/sctp/bind_addr.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/net/sctp/bind_addr.c b/net/sctp/bind_addr.c
index 7df3704982f5..ebf28adba789 100644
--- a/net/sctp/bind_addr.c
+++ b/net/sctp/bind_addr.c
@@ -337,6 +337,34 @@ int sctp_bind_addr_match(struct sctp_bind_addr *bp,
return match;
}
+int sctp_bind_addrs_check(struct sctp_sock *sp,
+ struct sctp_sock *sp2, int cnt2)
+{
+ struct sctp_bind_addr *bp2 = &sp2->ep->base.bind_addr;
+ struct sctp_bind_addr *bp = &sp->ep->base.bind_addr;
+ struct sctp_sockaddr_entry *laddr, *laddr2;
+ bool exist = false;
+ int cnt = 0;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(laddr, &bp->address_list, list) {
+ list_for_each_entry_rcu(laddr2, &bp2->address_list, list) {
+ if (sp->pf->af->cmp_addr(&laddr->a, &laddr2->a) &&
+ laddr->valid && laddr2->valid) {
+ exist = true;
+ goto next;
+ }
+ }
+ cnt = 0;
+ break;
+next:
+ cnt++;
+ }
+ rcu_read_unlock();
+
+ return (cnt == cnt2) ? 0 : (exist ? -EEXIST : 1);
+}
+
/* Does the address 'addr' conflict with any addresses in
* the bp.
*/