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net/l2tp: add support for L2TP over IPv6 UDP

Browse source 
Now that encap_rcv() works on IPv6 UDP sockets, wire L2TP up to IPv6.
Support has been tested with and without hardware offloading.  This
version fixes the L2TP over localhost issue with incorrect checksums
being reported.

Signed-off-by: Benjamin LaHaise <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Benjamin LaHaise 2012-04-27 08:24:18 +00:00 • committed by David S. Miller
commit d2cf336167
4 changed files with 157 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

87
net/l2tp/l2tp_core.c
View file

@ -53,6 +53,9 @@
#include <net/inet_common.h>
#include <net/xfrm.h>
#include <net/protocol.h>
#include <net/inet6_connection_sock.h>
#include <net/inet_ecn.h>
#include <net/ip6_route.h>
#include <asm/byteorder.h>
#include <linux/atomic.h>
@ -446,21 +449,43 @@ static inline int l2tp_verify_udp_checksum(struct sock *sk,
{
struct udphdr *uh = udp_hdr(skb);
u16 ulen = ntohs(uh->len);
struct inet_sock *inet;
__wsum psum;
if (sk->sk_no_check || skb_csum_unnecessary(skb) || !uh->check)
if (sk->sk_no_check || skb_csum_unnecessary(skb))
return 0;
inet = inet_sk(sk);
psum = csum_tcpudp_nofold(inet->inet_saddr, inet->inet_daddr, ulen,
IPPROTO_UDP, 0);
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == PF_INET6) {
if (!uh->check) {
LIMIT_NETDEBUG(KERN_INFO "L2TP: IPv6: checksum is 0\n");
return 1;
}
if ((skb->ip_summed == CHECKSUM_COMPLETE) &&
!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr, ulen,
IPPROTO_UDP, skb->csum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
return 0;
}
skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr,
skb->len, IPPROTO_UDP,
0));
} else
#endif
{
struct inet_sock *inet;
if (!uh->check)
return 0;
inet = inet_sk(sk);
psum = csum_tcpudp_nofold(inet->inet_saddr, inet->inet_daddr,
ulen, IPPROTO_UDP, 0);
if ((skb->ip_summed == CHECKSUM_COMPLETE) &&
!csum_fold(csum_add(psum, skb->csum)))
return 0;
skb->csum = psum;
if ((skb->ip_summed == CHECKSUM_COMPLETE) &&
!csum_fold(csum_add(psum, skb->csum)))
return 0;
skb->csum = psum;
}
return __skb_checksum_complete(skb);
}
@ -988,7 +1013,12 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
/* Queue the packet to IP for output */
skb->local_df = 1;
error = ip_queue_xmit(skb, fl);
#if IS_ENABLED(CONFIG_IPV6)
if (skb->sk->sk_family == PF_INET6)
error = inet6_csk_xmit(skb, NULL);
else
#endif
error = ip_queue_xmit(skb, fl);
/* Update stats */
if (error >= 0) {
@ -1021,6 +1051,31 @@ static inline void l2tp_skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
skb->destructor = l2tp_sock_wfree;
}
#if IS_ENABLED(CONFIG_IPV6)
static void l2tp_xmit_ipv6_csum(struct sock *sk, struct sk_buff *skb,
int udp_len)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct udphdr *uh = udp_hdr(skb);
if (!skb_dst(skb) || !skb_dst(skb)->dev ||
!(skb_dst(skb)->dev->features & NETIF_F_IPV6_CSUM)) {
__wsum csum = skb_checksum(skb, 0, udp_len, 0);
skb->ip_summed = CHECKSUM_UNNECESSARY;
uh->check = csum_ipv6_magic(&np->saddr, &np->daddr, udp_len,
IPPROTO_UDP, csum);
if (uh->check == 0)
uh->check = CSUM_MANGLED_0;
} else {
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_start = skb_transport_header(skb) - skb->head;
skb->csum_offset = offsetof(struct udphdr, check);
uh->check = ~csum_ipv6_magic(&np->saddr, &np->daddr,
udp_len, IPPROTO_UDP, 0);
}
}
#endif
/* If caller requires the skb to have a ppp header, the header must be
* inserted in the skb data before calling this function.
*/
@ -1089,6 +1144,11 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
uh->check = 0;
/* Calculate UDP checksum if configured to do so */
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == PF_INET6)
l2tp_xmit_ipv6_csum(sk, skb, udp_len);
else
#endif
if (sk->sk_no_check == UDP_CSUM_NOXMIT)
skb->ip_summed = CHECKSUM_NONE;
else if ((skb_dst(skb) && skb_dst(skb)->dev) &&
@ -1424,6 +1484,11 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
/* Mark socket as an encapsulation socket. See net/ipv4/udp.c */
udp_sk(sk)->encap_type = UDP_ENCAP_L2TPINUDP;
udp_sk(sk)->encap_rcv = l2tp_udp_encap_recv;
#if IS_ENABLED(CONFIG_IPV6)
if (sk->sk_family == PF_INET6)
udpv6_encap_enable();
else
#endif
udp_encap_enable();
}

42
net/l2tp/l2tp_ppp.c
View file

@ -916,7 +916,7 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
}
inet = inet_sk(tunnel->sock);
if (tunnel->version == 2) {
if ((tunnel->version == 2) && (tunnel->sock->sk_family == AF_INET)) {
struct sockaddr_pppol2tp sp;
len = sizeof(sp);
memset(&sp, 0, len);
@ -932,6 +932,46 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
sp.pppol2tp.addr.sin_port = inet->inet_dport;
sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
memcpy(uaddr, &sp, len);
#if IS_ENABLED(CONFIG_IPV6)
} else if ((tunnel->version == 2) &&
(tunnel->sock->sk_family == AF_INET6)) {
struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
struct sockaddr_pppol2tpin6 sp;
len = sizeof(sp);
memset(&sp, 0, len);
sp.sa_family = AF_PPPOX;
sp.sa_protocol = PX_PROTO_OL2TP;
sp.pppol2tp.fd = tunnel->fd;
sp.pppol2tp.pid = pls->owner;
sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
sp.pppol2tp.s_session = session->session_id;
sp.pppol2tp.d_session = session->peer_session_id;
sp.pppol2tp.addr.sin6_family = AF_INET6;
sp.pppol2tp.addr.sin6_port = inet->inet_dport;
memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
sizeof(np->daddr));
memcpy(uaddr, &sp, len);
} else if ((tunnel->version == 3) &&
(tunnel->sock->sk_family == AF_INET6)) {
struct ipv6_pinfo *np = inet6_sk(tunnel->sock);
struct sockaddr_pppol2tpv3in6 sp;
len = sizeof(sp);
memset(&sp, 0, len);
sp.sa_family = AF_PPPOX;
sp.sa_protocol = PX_PROTO_OL2TP;
sp.pppol2tp.fd = tunnel->fd;
sp.pppol2tp.pid = pls->owner;
sp.pppol2tp.s_tunnel = tunnel->tunnel_id;
sp.pppol2tp.d_tunnel = tunnel->peer_tunnel_id;
sp.pppol2tp.s_session = session->session_id;
sp.pppol2tp.d_session = session->peer_session_id;
sp.pppol2tp.addr.sin6_family = AF_INET6;
sp.pppol2tp.addr.sin6_port = inet->inet_dport;
memcpy(&sp.pppol2tp.addr.sin6_addr, &np->daddr,
sizeof(np->daddr));
memcpy(uaddr, &sp, len);
#endif
} else if (tunnel->version == 3) {
struct sockaddr_pppol2tpv3 sp;
len = sizeof(sp);