summaryrefslogtreecommitdiff
path: root/net/l2tp/l2tp_eth.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/l2tp/l2tp_eth.c')
-rw-r--r--net/l2tp/l2tp_eth.c32
1 files changed, 10 insertions, 22 deletions
diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index 5c366ecfa1cb..8aadc4f3bb9e 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -199,7 +199,6 @@ static void l2tp_eth_delete(struct l2tp_session *session)
}
}
-#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
static void l2tp_eth_show(struct seq_file *m, void *arg)
{
struct l2tp_session *session = arg;
@@ -219,29 +218,25 @@ static void l2tp_eth_show(struct seq_file *m, void *arg)
dev_put(dev);
}
-#endif
static void l2tp_eth_adjust_mtu(struct l2tp_tunnel *tunnel,
struct l2tp_session *session,
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) {
overhead += sizeof(struct udphdr);
dev->needed_headroom += sizeof(struct udphdr);
}
- if (session->mtu != 0) {
- dev->mtu = session->mtu;
- dev->needed_headroom += session->hdr_len;
- return;
- }
+
lock_sock(tunnel->sock);
l3_overhead = kernel_sock_ip_overhead(tunnel->sock);
release_sock(tunnel->sock);
+
if (l3_overhead == 0) {
/* L3 Overhead couldn't be identified, this could be
* because tunnel->sock was NULL or the socket's
@@ -255,18 +250,12 @@ 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);
+ mtu = l2tp_tunnel_dst_mtu(tunnel) - overhead;
+ if (mtu < dev->min_mtu || mtu > dev->max_mtu)
+ dev->mtu = ETH_DATA_LEN - overhead;
+ else
+ dev->mtu = mtu;
- if (pmtu != 0)
- dev->mtu = pmtu;
- dst_release(dst);
- }
- session->mtu = dev->mtu - overhead;
- dev->mtu = session->mtu;
dev->needed_headroom += session->hdr_len;
}
@@ -314,9 +303,8 @@ static int l2tp_eth_create(struct net *net, struct l2tp_tunnel *tunnel,
session->recv_skb = l2tp_eth_dev_recv;
session->session_close = l2tp_eth_delete;
-#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
- session->show = l2tp_eth_show;
-#endif
+ if (IS_ENABLED(CONFIG_L2TP_DEBUGFS))
+ session->show = l2tp_eth_show;
spriv = l2tp_session_priv(session);