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authorGuillaume Nault <g.nault@alphalink.fr>2018-08-03 12:38:34 +0200
committerDavid S. Miller <davem@davemloft.net>2018-08-03 10:03:57 -0700
commit1f5cd2a0107d4ed95cbd9118e6a5f7ccd3d4d12a (patch)
tree1ee06be60cafbb3e7c7df779677842c976d5716d /net/l2tp/l2tp_eth.c
parentf3184645cb0409d4ab0e63d65a0adcb565f55df4 (diff)
downloadlinux-1f5cd2a0107d4ed95cbd9118e6a5f7ccd3d4d12a.tar.bz2
l2tp: define l2tp_tunnel_dst_mtu()
Consolidate retrieval of tunnel's socket mtu in order to simplify l2tp_eth and l2tp_ppp a bit. Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_eth.c')
-rw-r--r--net/l2tp/l2tp_eth.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index 5c366ecfa1cb..cfca5e63ae31 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -226,8 +226,8 @@ static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
struct net_device *dev)
{
unsigned int overhead = 0;
- struct dst_entry *dst;
u32 l3_overhead = 0;
+ u32 mtu;
/* if the encap is UDP, account for UDP header size */
if (tunnel->encap == L2TP_ENCAPTYPE_UDP) {
@@ -256,15 +256,9 @@ static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
overhead += session->hdr_len + ETH_HLEN + l3_overhead;
/* If PMTU discovery was enabled, use discovered MTU on L2TP device */
- dst = sk_dst_get(tunnel->sock);
- if (dst) {
- /* dst_mtu will use PMTU if found, else fallback to intf MTU */
- u32 pmtu = dst_mtu(dst);
-
- if (pmtu != 0)
- dev->mtu = pmtu;
- dst_release(dst);
- }
+ mtu = l2tp_tunnel_dst_mtu(tunnel);
+ if (mtu)
+ dev->mtu = mtu;
session->mtu = dev->mtu - overhead;
dev->mtu = session->mtu;
dev->needed_headroom += session->hdr_len;