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authorDavid Howells <dhowells@redhat.com>2016-04-04 14:00:33 +0100
committerDavid Howells <dhowells@redhat.com>2016-06-15 10:15:06 +0100
commit1a70c05bad1383fdda95e713baee5f76c4726d24 (patch)
tree93fc3d87a6a42ced4bd7db7374135eeca8257b98 /net/rxrpc/peer_event.c
parentabe89ef0ed1a50ef6186d9aee433b995641a1293 (diff)
download96b-common-1a70c05bad1383fdda95e713baee5f76c4726d24.tar.gz
rxrpc: Break MTU determination from ICMP into its own function
Break MTU determination from ICMP out into its own function to reduce the complexity of the error report handler. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/peer_event.c')
-rw-r--r--net/rxrpc/peer_event.c93
1 files changed, 54 insertions, 39 deletions
diff --git a/net/rxrpc/peer_event.c b/net/rxrpc/peer_event.c
index 2c2df3a5d1b9..80de84257227 100644
--- a/net/rxrpc/peer_event.c
+++ b/net/rxrpc/peer_event.c
@@ -72,6 +72,45 @@ static struct rxrpc_peer *rxrpc_lookup_peer_icmp_rcu(struct rxrpc_local *local,
}
/*
+ * Handle an MTU/fragmentation problem.
+ */
+static void rxrpc_adjust_mtu(struct rxrpc_peer *peer, struct sock_exterr_skb *serr)
+{
+ u32 mtu = serr->ee.ee_info;
+
+ _net("Rx ICMP Fragmentation Needed (%d)", mtu);
+
+ /* wind down the local interface MTU */
+ if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
+ peer->if_mtu = mtu;
+ _net("I/F MTU %u", mtu);
+ }
+
+ if (mtu == 0) {
+ /* they didn't give us a size, estimate one */
+ mtu = peer->if_mtu;
+ if (mtu > 1500) {
+ mtu >>= 1;
+ if (mtu < 1500)
+ mtu = 1500;
+ } else {
+ mtu -= 100;
+ if (mtu < peer->hdrsize)
+ mtu = peer->hdrsize + 4;
+ }
+ }
+
+ if (mtu < peer->mtu) {
+ spin_lock_bh(&peer->lock);
+ peer->mtu = mtu;
+ peer->maxdata = peer->mtu - peer->hdrsize;
+ spin_unlock_bh(&peer->lock);
+ _net("Net MTU %u (maxdata %u)",
+ peer->mtu, peer->maxdata);
+ }
+}
+
+/*
* handle an error received on the local endpoint
*/
void rxrpc_error_report(struct sock *sk)
@@ -126,50 +165,26 @@ void rxrpc_error_report(struct sock *sk)
return;
}
- if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
- serr->ee.ee_type == ICMP_DEST_UNREACH &&
- serr->ee.ee_code == ICMP_FRAG_NEEDED
- ) {
- u32 mtu = serr->ee.ee_info;
-
- _net("Rx Received ICMP Fragmentation Needed (%d)", mtu);
-
- /* wind down the local interface MTU */
- if (mtu > 0 && peer->if_mtu == 65535 && mtu < peer->if_mtu) {
- peer->if_mtu = mtu;
- _net("I/F MTU %u", mtu);
- }
-
- if (mtu == 0) {
- /* they didn't give us a size, estimate one */
- mtu = peer->if_mtu;
- if (mtu > 1500) {
- mtu >>= 1;
- if (mtu < 1500)
- mtu = 1500;
- } else {
- mtu -= 100;
- if (mtu < peer->hdrsize)
- mtu = peer->hdrsize + 4;
- }
- }
-
- if (mtu < peer->mtu) {
- spin_lock_bh(&peer->lock);
- peer->mtu = mtu;
- peer->maxdata = peer->mtu - peer->hdrsize;
- spin_unlock_bh(&peer->lock);
- _net("Net MTU %u (maxdata %u)",
- peer->mtu, peer->maxdata);
- }
+ if ((serr->ee.ee_origin == SO_EE_ORIGIN_ICMP &&
+ serr->ee.ee_type == ICMP_DEST_UNREACH &&
+ serr->ee.ee_code == ICMP_FRAG_NEEDED)) {
+ rxrpc_adjust_mtu(peer, serr);
+ rxrpc_free_skb(skb);
+ skb = NULL;
+ goto out;
}
+out:
rcu_read_unlock();
rxrpc_put_peer(peer);
- /* pass the transport ref to error_handler to release */
- skb_queue_tail(&trans->error_queue, skb);
- rxrpc_queue_work(&trans->error_handler);
+ if (skb) {
+ /* pass the transport ref to error_handler to release */
+ skb_queue_tail(&trans->error_queue, skb);
+ rxrpc_queue_work(&trans->error_handler);
+ } else {
+ rxrpc_put_transport(trans);
+ }
_leave("");
}