net/l2tp: add support for L2TP over IPv6 UDP
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 <bcrl@kvack.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index 1addd9f..27b9dec 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -916,7 +916,7 @@
}
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 @@
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);