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l2tp: define l2tp_tunnel_dst_mtu()

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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>
This commit is contained in:
Guillaume Nault 2018-08-03 12:38:34 +02:00 committed by David S. Miller
parent f3184645cb
commit 1f5cd2a010
3 changed files with 26 additions and 21 deletions
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18
net/l2tp/l2tp_core.h
View File

@ -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)) \

14
net/l2tp/l2tp_eth.c
View File

@ -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;

15
net/l2tp/l2tp_ppp.c
View File

@ -93,7 +93,6 @@
#include <linux/nsproxy.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/dst.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/xfrm.h>
@ -554,7 +553,7 @@ static void pppol2tp_show(struct seq_file *m, void *arg)
static void pppol2tp_session_init(struct l2tp_session *session)
{
struct pppol2tp_session *ps;
struct dst_entry *dst;
u32 mtu;
session->recv_skb = pppol2tp_recv;
#if IS_ENABLED(CONFIG_L2TP_DEBUGFS)
@ -566,15 +565,9 @@ static void pppol2tp_session_init(struct l2tp_session *session)
ps->owner = current->pid;
/* If PMTU discovery was enabled, use the MTU that was discovered */
dst = sk_dst_get(session->tunnel->sock);
if (dst) {
u32 pmtu = dst_mtu(dst);
if (pmtu)
session->mtu = pmtu - PPPOL2TP_HEADER_OVERHEAD;
dst_release(dst);
}
mtu = l2tp_tunnel_dst_mtu(session->tunnel);
if (mtu)
session->mtu = mtu - PPPOL2TP_HEADER_OVERHEAD;
}
struct l2tp_connect_info {