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l2tp: Add L2TPv3 IP encapsulation (no UDP) support

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This patch adds a new L2TPIP socket family and modifies the core to
handle the case where there is no UDP header in the L2TP
packet. L2TP/IP uses IP protocol 115. Since L2TP/UDP and L2TP/IP
packets differ in layout, the datapath packet handling code needs
changes too. Userspace uses an L2TPIP socket instead of a UDP socket
when IP encapsulation is required.

We can't use raw sockets for this because the semantics of raw sockets
don't lend themselves to the socket-per-tunnel model - we need to

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
James Chapman
2010-04-02 06:19:00 +00:00
committed by David S. Miller
parent e0d4435f93
commit 0d76751fad
7 changed files with 850 additions and 62 deletions
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net/l2tp/l2tp_core.h
+7
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@@ -48,6 +48,11 @@ enum l2tp_l2spec_type {
L2TP_L2SPECTYPE_DEFAULT,
};
enum l2tp_encap_type {
L2TP_ENCAPTYPE_UDP,
L2TP_ENCAPTYPE_IP,
};
struct sk_buff;
struct l2tp_stats {
@@ -155,6 +160,7 @@ struct l2tp_session {
struct l2tp_tunnel_cfg {
int debug; /* bitmask of debug message
* categories */
enum l2tp_encap_type encap;
};
struct l2tp_tunnel {
@@ -170,6 +176,7 @@ struct l2tp_tunnel {
char name[20]; /* for logging */
int debug; /* bitmask of debug message
* categories */
enum l2tp_encap_type encap;
struct l2tp_stats stats;
struct list_head list; /* Keep a list of all tunnels */