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authorGuillaume Nault <g.nault@alphalink.fr>2018-08-03 13:38:34 +0300
committerDavid S. Miller <davem@davemloft.net>2018-08-03 20:03:57 +0300
commit1f5cd2a0107d4ed95cbd9118e6a5f7ccd3d4d12a (patch)
tree1ee06be60cafbb3e7c7df779677842c976d5716d /net/l2tp/l2tp_core.h
parentf3184645cb0409d4ab0e63d65a0adcb565f55df4 (diff)
downloadlinux-1f5cd2a0107d4ed95cbd9118e6a5f7ccd3d4d12a.tar.xz
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_core.h')
-rw-r--r--net/l2tp/l2tp_core.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index fa5ae9432d38..1ca39629031b 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -12,6 +12,9 @@
#ifndef _L2TP_CORE_H_
#define _L2TP_CORE_H_
+#include <net/dst.h>
+#include <net/sock.h>
+
/* Just some random numbers */
#define L2TP_TUNNEL_MAGIC 0x42114DDA
#define L2TP_SESSION_MAGIC 0x0C04EB7D
@@ -268,6 +271,21 @@ static inline int l2tp_get_l2specific_len(struct l2tp_session *session)
}
}
+static inline u32 l2tp_tunnel_dst_mtu(const struct l2tp_tunnel *tunnel)
+{
+ struct dst_entry *dst;
+ u32 mtu;
+
+ dst = sk_dst_get(tunnel->sock);
+ if (!dst)
+ return 0;
+
+ mtu = dst_mtu(dst);
+ dst_release(dst);
+
+ return mtu;
+}
+
#define l2tp_printk(ptr, type, func, fmt, ...) \
do { \
if (((ptr)->debug) & (type)) \