[IPV6]: Check connect(2) status for IPv6 UDP socket (Re: xfrm_lookup)

I think we should cache the per-socket route(dst_entry) only when the
IPv6 UDP socket is connect(2)'ed.
(which is same as IPv4 UDP send behavior)

Signed-off-by: Mitsuru KANDA <mk@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 2b9bf9bd177f8353c7ab67c1b9e7bd52fd6703c8..6001948600f31bcbe622f18a9fc4461f6ef8531b 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -639,6 +639,7 @@ static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
        int tclass = -1;
        int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
        int err;
+       int connected = 0;
 
        /* destination address check */
        if (sin6) {
@@ -748,6 +749,7 @@ do_udp_sendmsg:
                fl->fl_ip_dport = inet->dport;
                daddr = &np->daddr;
                fl->fl6_flowlabel = np->flow_label;
+               connected = 1;
        }
 
        if (!fl->oif)
@@ -770,6 +772,7 @@ do_udp_sendmsg:
                }
                if (!(opt->opt_nflen|opt->opt_flen))
                        opt = NULL;
+               connected = 0;
        }
        if (opt == NULL)
                opt = np->opt;
@@ -787,10 +790,13 @@ do_udp_sendmsg:
                ipv6_addr_copy(&final, &fl->fl6_dst);
                ipv6_addr_copy(&fl->fl6_dst, rt0->addr);
                final_p = &final;
+               connected = 0;
        }
 
-       if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
+       if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) {
                fl->oif = np->mcast_oif;
+               connected = 0;
+       }
 
        err = ip6_dst_lookup(sk, &dst, fl);
        if (err)
@@ -846,7 +852,7 @@ do_append_data:
        else if (!corkreq)
                err = udp_v6_push_pending_frames(sk, up);
 
-       if (dst)
+       if (dst && connected)
                ip6_dst_store(sk, dst,
                              ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
                              &np->daddr : NULL);