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Date: Fri, 27 Sep 2013 13:17:33 +0200
From: François Cachereul <f.cachereul@...t-sys.com>
To: James Chapman <jchapman@...alix.com>
CC: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH next] l2tp: add support for IPv4-mapped IPv6 addresses
IPv4 mapped addresses cause kernel panic.
The patch juste check whether the IPv6 address is an IPv4 mapped
address. If so, use IPv4 API instead of IPv6.
Signed-off-by: François CACHEREUL <f.cachereul@...halink.fr>
---
net/l2tp/l2tp_core.c | 28 ++++++++++++++++++++++++----
net/l2tp/l2tp_core.h | 3 +++
2 files changed, 27 insertions(+), 4 deletions(-)
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index feae495..731aa40 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -496,6 +496,7 @@ out:
static inline int l2tp_verify_udp_checksum(struct sock *sk,
struct sk_buff *skb)
{
+ struct l2tp_tunnel *tunnel = (struct l2tp_tunnel *)sk->sk_user_data;
struct udphdr *uh = udp_hdr(skb);
u16 ulen = ntohs(uh->len);
__wsum psum;
@@ -504,7 +505,7 @@ static inline int l2tp_verify_udp_checksum(struct sock *sk,
return 0;
#if IS_ENABLED(CONFIG_IPV6)
- if (sk->sk_family == PF_INET6) {
+ if (sk->sk_family == PF_INET6 && !tunnel->v4mapped) {
if (!uh->check) {
LIMIT_NETDEBUG(KERN_INFO "L2TP: IPv6: checksum is 0\n");
return 1;
@@ -1128,7 +1129,7 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
/* Queue the packet to IP for output */
skb->local_df = 1;
#if IS_ENABLED(CONFIG_IPV6)
- if (skb->sk->sk_family == PF_INET6)
+ if (skb->sk->sk_family == PF_INET6 && !tunnel->v4mapped)
error = inet6_csk_xmit(skb, NULL);
else
#endif
@@ -1255,7 +1256,7 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
/* Calculate UDP checksum if configured to do so */
#if IS_ENABLED(CONFIG_IPV6)
- if (sk->sk_family == PF_INET6)
+ if (sk->sk_family == PF_INET6 && !tunnel->v4mapped)
l2tp_xmit_ipv6_csum(sk, skb, udp_len);
else
#endif
@@ -1620,6 +1621,10 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
int err;
struct socket *sock = NULL;
struct sock *sk = NULL;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct inet_sock *inet = NULL;
+ struct ipv6_pinfo *np = NULL;
+#endif
struct l2tp_net *pn;
enum l2tp_encap_type encap = L2TP_ENCAPTYPE_UDP;
@@ -1704,6 +1709,21 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
if (cfg != NULL)
tunnel->debug = cfg->debug;
+#if IS_ENABLED(CONFIG_IPV6)
+ np = inet6_sk(sk);
+ if (sk->sk_family == PF_INET6 &&
+ ipv6_addr_v4mapped(&np->saddr) &&
+ ipv6_addr_v4mapped(&np->daddr)) {
+ tunnel->v4mapped = true;
+ inet = inet_sk(sk);
+ inet->inet_saddr = np->saddr.s6_addr32[3];
+ inet->inet_rcv_saddr = np->rcv_saddr.s6_addr32[3];
+ inet->inet_daddr = np->daddr.s6_addr32[3];
+ } else {
+ tunnel->v4mapped = false;
+ }
+#endif
+
/* Mark socket as an encapsulation socket. See net/ipv4/udp.c */
tunnel->encap = encap;
if (encap == L2TP_ENCAPTYPE_UDP) {
@@ -1712,7 +1732,7 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
udp_sk(sk)->encap_rcv = l2tp_udp_encap_recv;
udp_sk(sk)->encap_destroy = l2tp_udp_encap_destroy;
#if IS_ENABLED(CONFIG_IPV6)
- if (sk->sk_family == PF_INET6)
+ if (sk->sk_family == PF_INET6 && !tunnel->v4mapped)
udpv6_encap_enable();
else
#endif
diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index 66a559b..6f251cb 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -194,6 +194,9 @@ struct l2tp_tunnel {
struct sock *sock; /* Parent socket */
int fd; /* Parent fd, if tunnel socket
* was created by userspace */
+#if IS_ENABLED(CONFIG_IPV6)
+ bool v4mapped;
+#endif
struct work_struct del_work;
--
1.7.10.4
--
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