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-rw-r--r--include/linux/if_pppol2tp.h14
-rw-r--r--include/linux/if_pppox.h9
-rw-r--r--net/l2tp/l2tp_ppp.c120
3 files changed, 97 insertions, 46 deletions
diff --git a/include/linux/if_pppol2tp.h b/include/linux/if_pppol2tp.h
index 1a1fb6e5d933..184bc5566207 100644
--- a/include/linux/if_pppol2tp.h
+++ b/include/linux/if_pppol2tp.h
@@ -35,6 +35,20 @@ struct pppol2tp_addr {
__u16 d_tunnel, d_session; /* For sending outgoing packets */
};
+/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
+ * bits. So we need a different sockaddr structure.
+ */
+struct pppol2tpv3_addr {
+ pid_t pid; /* pid that owns the fd.
+ * 0 => current */
+ int fd; /* FD of UDP or IP socket to use */
+
+ struct sockaddr_in addr; /* IP address and port to send to */
+
+ __u32 s_tunnel, s_session; /* For matching incoming packets */
+ __u32 d_tunnel, d_session; /* For sending outgoing packets */
+};
+
/* Socket options:
* DEBUG - bitmask of debug message categories
* SENDSEQ - 0 => don't send packets with sequence numbers
diff --git a/include/linux/if_pppox.h b/include/linux/if_pppox.h
index 90b5fae5d714..a6577af0c4e6 100644
--- a/include/linux/if_pppox.h
+++ b/include/linux/if_pppox.h
@@ -72,6 +72,15 @@ struct sockaddr_pppol2tp {
struct pppol2tp_addr pppol2tp;
}__attribute__ ((packed));
+/* The L2TPv3 protocol changes tunnel and session ids from 16 to 32
+ * bits. So we need a different sockaddr structure.
+ */
+struct sockaddr_pppol2tpv3 {
+ sa_family_t sa_family; /* address family, AF_PPPOX */
+ unsigned int sa_protocol; /* protocol identifier */
+ struct pppol2tpv3_addr pppol2tp;
+} __attribute__ ((packed));
+
/*********************************************************************
*
* ioctl interface for defining forwarding of connections
diff --git a/net/l2tp/l2tp_ppp.c b/net/l2tp/l2tp_ppp.c
index bee5b1413ec0..e5b531266541 100644
--- a/net/l2tp/l2tp_ppp.c
+++ b/net/l2tp/l2tp_ppp.c
@@ -291,17 +291,6 @@ static void pppol2tp_session_sock_put(struct l2tp_session *session)
* Transmit handling
***********************************************************************/
-/* Tell how big L2TP headers are for a particular session. This
- * depends on whether sequence numbers are being used.
- */
-static inline int pppol2tp_l2tp_header_len(struct l2tp_session *session)
-{
- if (session->send_seq)
- return PPPOL2TP_L2TP_HDR_SIZE_SEQ;
-
- return PPPOL2TP_L2TP_HDR_SIZE_NOSEQ;
-}
-
/* This is the sendmsg for the PPPoL2TP pppol2tp_session socket. We come here
* when a user application does a sendmsg() on the session socket. L2TP and
* PPP headers must be inserted into the user's data.
@@ -394,7 +383,6 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
static const u8 ppph[2] = { 0xff, 0x03 };
struct sock *sk = (struct sock *) chan->private;
struct sock *sk_tun;
- int hdr_len;
struct l2tp_session *session;
struct l2tp_tunnel *tunnel;
struct pppol2tp_session *ps;
@@ -417,9 +405,6 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
if (tunnel == NULL)
goto abort_put_sess;
- /* What header length is configured for this session? */
- hdr_len = pppol2tp_l2tp_header_len(session);
-
old_headroom = skb_headroom(skb);
if (skb_cow_head(skb, sizeof(ppph)))
goto abort_put_sess_tun;
@@ -432,7 +417,7 @@ static int pppol2tp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
skb->data[0] = ppph[0];
skb->data[1] = ppph[1];
- l2tp_xmit_skb(session, skb, hdr_len);
+ l2tp_xmit_skb(session, skb, session->hdr_len);
sock_put(sk_tun);
sock_put(sk);
@@ -615,6 +600,7 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
{
struct sock *sk = sock->sk;
struct sockaddr_pppol2tp *sp = (struct sockaddr_pppol2tp *) uservaddr;
+ struct sockaddr_pppol2tpv3 *sp3 = (struct sockaddr_pppol2tpv3 *) uservaddr;
struct pppox_sock *po = pppox_sk(sk);
struct l2tp_session *session = NULL;
struct l2tp_tunnel *tunnel;
@@ -622,6 +608,10 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
struct dst_entry *dst;
struct l2tp_session_cfg cfg = { 0, };
int error = 0;
+ u32 tunnel_id, peer_tunnel_id;
+ u32 session_id, peer_session_id;
+ int ver = 2;
+ int fd;
lock_sock(sk);
@@ -639,21 +629,40 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
if (sk->sk_user_data)
goto end; /* socket is already attached */
- /* Don't bind if s_tunnel is 0 */
+ /* Get params from socket address. Handle L2TPv2 and L2TPv3 */
+ if (sockaddr_len == sizeof(struct sockaddr_pppol2tp)) {
+ fd = sp->pppol2tp.fd;
+ tunnel_id = sp->pppol2tp.s_tunnel;
+ peer_tunnel_id = sp->pppol2tp.d_tunnel;
+ session_id = sp->pppol2tp.s_session;
+ peer_session_id = sp->pppol2tp.d_session;
+ } else if (sockaddr_len == sizeof(struct sockaddr_pppol2tpv3)) {
+ ver = 3;
+ fd = sp3->pppol2tp.fd;
+ tunnel_id = sp3->pppol2tp.s_tunnel;
+ peer_tunnel_id = sp3->pppol2tp.d_tunnel;
+ session_id = sp3->pppol2tp.s_session;
+ peer_session_id = sp3->pppol2tp.d_session;
+ } else {
+ error = -EINVAL;
+ goto end; /* bad socket address */
+ }
+
+ /* Don't bind if tunnel_id is 0 */
error = -EINVAL;
- if (sp->pppol2tp.s_tunnel == 0)
+ if (tunnel_id == 0)
goto end;
- /* Special case: create tunnel context if s_session and
- * d_session is 0. Otherwise look up tunnel using supplied
+ /* Special case: create tunnel context if session_id and
+ * peer_session_id is 0. Otherwise look up tunnel using supplied
* tunnel id.
*/
- if ((sp->pppol2tp.s_session == 0) && (sp->pppol2tp.d_session == 0)) {
- error = l2tp_tunnel_create(sock_net(sk), sp->pppol2tp.fd, 2, sp->pppol2tp.s_tunnel, sp->pppol2tp.d_tunnel, NULL, &tunnel);
+ if ((session_id == 0) && (peer_session_id == 0)) {
+ error = l2tp_tunnel_create(sock_net(sk), fd, ver, tunnel_id, peer_tunnel_id, NULL, &tunnel);
if (error < 0)
goto end;
} else {
- tunnel = l2tp_tunnel_find(sock_net(sk), sp->pppol2tp.s_tunnel);
+ tunnel = l2tp_tunnel_find(sock_net(sk), tunnel_id);
/* Error if we can't find the tunnel */
error = -ENOENT;
@@ -670,20 +679,21 @@ static int pppol2tp_connect(struct socket *sock, struct sockaddr *uservaddr,
/* Check that this session doesn't already exist */
error = -EEXIST;
- session = l2tp_session_find(sock_net(sk), tunnel, sp->pppol2tp.s_session);
+ session = l2tp_session_find(sock_net(sk), tunnel, session_id);
if (session != NULL)
goto end;
- /* Default MTU must allow space for UDP/L2TP/PPP
- * headers.
- */
- cfg.mtu = cfg.mru = 1500 - PPPOL2TP_HEADER_OVERHEAD;
+ /* Default MTU values. */
+ if (cfg.mtu == 0)
+ cfg.mtu = 1500 - PPPOL2TP_HEADER_OVERHEAD;
+ if (cfg.mru == 0)
+ cfg.mru = cfg.mtu;
cfg.debug = tunnel->debug;
/* Allocate and initialize a new session context. */
session = l2tp_session_create(sizeof(struct pppol2tp_session),
- tunnel, sp->pppol2tp.s_session,
- sp->pppol2tp.d_session, &cfg);
+ tunnel, session_id,
+ peer_session_id, &cfg);
if (session == NULL) {
error = -ENOMEM;
goto end;
@@ -756,8 +766,7 @@ end:
static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
int *usockaddr_len, int peer)
{
- int len = sizeof(struct sockaddr_pppol2tp);
- struct sockaddr_pppol2tp sp;
+ int len = 0;
int error = 0;
struct l2tp_session *session;
struct l2tp_tunnel *tunnel;
@@ -783,21 +792,40 @@ static int pppol2tp_getname(struct socket *sock, struct sockaddr *uaddr,
goto end_put_sess;
}
- 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;
inet = inet_sk(sk);
- sp.pppol2tp.addr.sin_family = AF_INET;
- sp.pppol2tp.addr.sin_port = inet->inet_dport;
- sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
-
- memcpy(uaddr, &sp, len);
+ if (tunnel->version == 2) {
+ struct sockaddr_pppol2tp 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.sin_family = AF_INET;
+ sp.pppol2tp.addr.sin_port = inet->inet_dport;
+ sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
+ memcpy(uaddr, &sp, len);
+ } else if (tunnel->version == 3) {
+ struct sockaddr_pppol2tpv3 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.sin_family = AF_INET;
+ sp.pppol2tp.addr.sin_port = inet->inet_dport;
+ sp.pppol2tp.addr.sin_addr.s_addr = inet->inet_daddr;
+ memcpy(uaddr, &sp, len);
+ }
*usockaddr_len = len;
generated by cgit (git 2.34.1) at 2024-05-24 12:22:13 +0000