rxrpc: Fix DATA Tx to disable nofrag for UDP on AF_INET6 socket

Fix the DATA packet transmission to disable nofrag for UDPv4 on an AF_INET6
socket as well as UDPv6 when trying to transmit fragmentably.

Without this, packets filled to the normal size used by the kernel AFS
client of 1412 bytes be rejected by udp_sendmsg() with EMSGSIZE
immediately.  The ->sk_error_report() notification hook is called, but
rxrpc doesn't generate a trace for it.

This is a temporary fix; a more permanent solution needs to involve
changing the size of the packets being filled in accordance with the MTU,
which isn't currently done in AF_RXRPC.  The reason for not doing so was
that, barring the last packet in an rx jumbo packet, jumbos can only be
assembled out of 1412-byte packets - and the plan was to construct jumbos
on the fly at transmission time.

Also, there's no point turning on IPV6_MTU_DISCOVER, since IPv6 has to
engage in this anyway since fragmentation is only done by the sender.  We
can then condense the switch-statement in rxrpc_send_data_packet().

Fixes: 75b54cb57ca3 ("rxrpc: Add IPv6 support")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
index a6c1349e965d94c3ef6361c04298799a25a2f8c3..01135e54d95d2c6f7cffc3010e0c2ca7beb2761c 100644 (file)
--- a/net/rxrpc/local_object.c
+++ b/net/rxrpc/local_object.c
@@ -165,15 +165,6 @@ static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
                        goto error;
                }
 
-               /* we want to set the don't fragment bit */
-               opt = IPV6_PMTUDISC_DO;
-               ret = kernel_setsockopt(local->socket, SOL_IPV6, IPV6_MTU_DISCOVER,
-                                       (char *) &opt, sizeof(opt));
-               if (ret < 0) {
-                       _debug("setsockopt failed");
-                       goto error;
-               }
-
                /* Fall through and set IPv4 options too otherwise we don't get
                 * errors from IPv4 packets sent through the IPv6 socket.
                 */

diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index bad3d242034466d9b3a21b9d92bd26d30d829c4a..90e263c6aa69e441c5c9e1232bab6acc375a663b 100644 (file)
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -474,41 +474,21 @@ send_fragmentable:
        skb->tstamp = ktime_get_real();
 
        switch (conn->params.local->srx.transport.family) {
+       case AF_INET6:
        case AF_INET:
                opt = IP_PMTUDISC_DONT;
-               ret = kernel_setsockopt(conn->params.local->socket,
-                                       SOL_IP, IP_MTU_DISCOVER,
-                                       (char *)&opt, sizeof(opt));
-               if (ret == 0) {
-                       ret = kernel_sendmsg(conn->params.local->socket, &msg,
-                                            iov, 2, len);
-                       conn->params.peer->last_tx_at = ktime_get_seconds();
-
-                       opt = IP_PMTUDISC_DO;
-                       kernel_setsockopt(conn->params.local->socket, SOL_IP,
-                                         IP_MTU_DISCOVER,
-                                         (char *)&opt, sizeof(opt));
-               }
-               break;
-
-#ifdef CONFIG_AF_RXRPC_IPV6
-       case AF_INET6:
-               opt = IPV6_PMTUDISC_DONT;
-               ret = kernel_setsockopt(conn->params.local->socket,
-                                       SOL_IPV6, IPV6_MTU_DISCOVER,
-                                       (char *)&opt, sizeof(opt));
-               if (ret == 0) {
-                       ret = kernel_sendmsg(conn->params.local->socket, &msg,
-                                            iov, 2, len);
-                       conn->params.peer->last_tx_at = ktime_get_seconds();
-
-                       opt = IPV6_PMTUDISC_DO;
-                       kernel_setsockopt(conn->params.local->socket,
-                                         SOL_IPV6, IPV6_MTU_DISCOVER,
-                                         (char *)&opt, sizeof(opt));
-               }
+               kernel_setsockopt(conn->params.local->socket,
+                                 SOL_IP, IP_MTU_DISCOVER,
+                                 (char *)&opt, sizeof(opt));
+               ret = kernel_sendmsg(conn->params.local->socket, &msg,
+                                    iov, 2, len);
+               conn->params.peer->last_tx_at = ktime_get_seconds();
+
+               opt = IP_PMTUDISC_DO;
+               kernel_setsockopt(conn->params.local->socket,
+                                 SOL_IP, IP_MTU_DISCOVER,
+                                 (char *)&opt, sizeof(opt));
                break;
-#endif
 
        default:
                BUG();