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309795f4be
In L2TPv3, we need to create/delete/modify/query L2TP tunnel and session contexts. The number of parameters is significant. So let's use netlink. Userspace uses this API to control L2TP tunnel/session contexts in the kernel. The previous pppol2tp driver was managed using [gs]etsockopt(). This API is retained for backwards compatibility. Unlike L2TPv2 which carries only PPP frames, L2TPv3 can carry raw ethernet frames or other frame types and these do not always have an associated socket family. Therefore, we need a way to use L2TP sessions that doesn't require a socket type for each supported frame type. Hence netlink is used. Signed-off-by: James Chapman <jchapman@katalix.com> Reviewed-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/*
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* L2TP-over-IP socket for L2TPv3.
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*
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* Author: James Chapman <jchapman@katalix.com>
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*/
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#ifndef _LINUX_L2TP_H_
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#define _LINUX_L2TP_H_
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#include <linux/types.h>
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#ifdef __KERNEL__
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#include <linux/socket.h>
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#include <linux/in.h>
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#else
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#include <netinet/in.h>
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#endif
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#define IPPROTO_L2TP 115
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/**
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* struct sockaddr_l2tpip - the sockaddr structure for L2TP-over-IP sockets
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* @l2tp_family: address family number AF_L2TPIP.
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* @l2tp_addr: protocol specific address information
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* @l2tp_conn_id: connection id of tunnel
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*/
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#define __SOCK_SIZE__ 16 /* sizeof(struct sockaddr) */
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struct sockaddr_l2tpip {
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/* The first fields must match struct sockaddr_in */
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sa_family_t l2tp_family; /* AF_INET */
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__be16 l2tp_unused; /* INET port number (unused) */
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struct in_addr l2tp_addr; /* Internet address */
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__u32 l2tp_conn_id; /* Connection ID of tunnel */
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/* Pad to size of `struct sockaddr'. */
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unsigned char __pad[sizeof(struct sockaddr) - sizeof(sa_family_t) -
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sizeof(__be16) - sizeof(struct in_addr) -
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sizeof(__u32)];
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};
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/*****************************************************************************
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* NETLINK_GENERIC netlink family.
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*****************************************************************************/
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/*
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* Commands.
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* Valid TLVs of each command are:-
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* TUNNEL_CREATE - CONN_ID, pw_type, netns, ifname, ipinfo, udpinfo, udpcsum, vlanid
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* TUNNEL_DELETE - CONN_ID
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* TUNNEL_MODIFY - CONN_ID, udpcsum
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* TUNNEL_GETSTATS - CONN_ID, (stats)
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* TUNNEL_GET - CONN_ID, (...)
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* SESSION_CREATE - SESSION_ID, PW_TYPE, offset, data_seq, cookie, peer_cookie, offset, l2spec
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* SESSION_DELETE - SESSION_ID
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* SESSION_MODIFY - SESSION_ID, data_seq
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* SESSION_GET - SESSION_ID, (...)
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* SESSION_GETSTATS - SESSION_ID, (stats)
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*
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*/
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enum {
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L2TP_CMD_NOOP,
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L2TP_CMD_TUNNEL_CREATE,
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L2TP_CMD_TUNNEL_DELETE,
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L2TP_CMD_TUNNEL_MODIFY,
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L2TP_CMD_TUNNEL_GET,
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L2TP_CMD_SESSION_CREATE,
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L2TP_CMD_SESSION_DELETE,
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L2TP_CMD_SESSION_MODIFY,
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L2TP_CMD_SESSION_GET,
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__L2TP_CMD_MAX,
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};
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#define L2TP_CMD_MAX (__L2TP_CMD_MAX - 1)
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/*
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* ATTR types defined for L2TP
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*/
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enum {
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L2TP_ATTR_NONE, /* no data */
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L2TP_ATTR_PW_TYPE, /* u16, enum l2tp_pwtype */
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L2TP_ATTR_ENCAP_TYPE, /* u16, enum l2tp_encap_type */
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L2TP_ATTR_OFFSET, /* u16 */
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L2TP_ATTR_DATA_SEQ, /* u16 */
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L2TP_ATTR_L2SPEC_TYPE, /* u8, enum l2tp_l2spec_type */
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L2TP_ATTR_L2SPEC_LEN, /* u8, enum l2tp_l2spec_type */
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L2TP_ATTR_PROTO_VERSION, /* u8 */
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L2TP_ATTR_IFNAME, /* string */
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L2TP_ATTR_CONN_ID, /* u32 */
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L2TP_ATTR_PEER_CONN_ID, /* u32 */
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L2TP_ATTR_SESSION_ID, /* u32 */
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L2TP_ATTR_PEER_SESSION_ID, /* u32 */
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L2TP_ATTR_UDP_CSUM, /* u8 */
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L2TP_ATTR_VLAN_ID, /* u16 */
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L2TP_ATTR_COOKIE, /* 0, 4 or 8 bytes */
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L2TP_ATTR_PEER_COOKIE, /* 0, 4 or 8 bytes */
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L2TP_ATTR_DEBUG, /* u32 */
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L2TP_ATTR_RECV_SEQ, /* u8 */
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L2TP_ATTR_SEND_SEQ, /* u8 */
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L2TP_ATTR_LNS_MODE, /* u8 */
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L2TP_ATTR_USING_IPSEC, /* u8 */
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L2TP_ATTR_RECV_TIMEOUT, /* msec */
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L2TP_ATTR_FD, /* int */
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L2TP_ATTR_IP_SADDR, /* u32 */
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L2TP_ATTR_IP_DADDR, /* u32 */
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L2TP_ATTR_UDP_SPORT, /* u16 */
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L2TP_ATTR_UDP_DPORT, /* u16 */
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L2TP_ATTR_MTU, /* u16 */
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L2TP_ATTR_MRU, /* u16 */
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L2TP_ATTR_STATS, /* nested */
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__L2TP_ATTR_MAX,
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};
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#define L2TP_ATTR_MAX (__L2TP_ATTR_MAX - 1)
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/* Nested in L2TP_ATTR_STATS */
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enum {
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L2TP_ATTR_STATS_NONE, /* no data */
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L2TP_ATTR_TX_PACKETS, /* u64 */
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L2TP_ATTR_TX_BYTES, /* u64 */
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L2TP_ATTR_TX_ERRORS, /* u64 */
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L2TP_ATTR_RX_PACKETS, /* u64 */
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L2TP_ATTR_RX_BYTES, /* u64 */
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L2TP_ATTR_RX_SEQ_DISCARDS, /* u64 */
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L2TP_ATTR_RX_OOS_PACKETS, /* u64 */
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L2TP_ATTR_RX_ERRORS, /* u64 */
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__L2TP_ATTR_STATS_MAX,
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};
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#define L2TP_ATTR_STATS_MAX (__L2TP_ATTR_STATS_MAX - 1)
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enum l2tp_pwtype {
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L2TP_PWTYPE_NONE = 0x0000,
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L2TP_PWTYPE_ETH_VLAN = 0x0004,
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L2TP_PWTYPE_ETH = 0x0005,
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L2TP_PWTYPE_PPP = 0x0007,
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L2TP_PWTYPE_PPP_AC = 0x0008,
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L2TP_PWTYPE_IP = 0x000b,
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__L2TP_PWTYPE_MAX
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};
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enum l2tp_l2spec_type {
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L2TP_L2SPECTYPE_NONE,
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L2TP_L2SPECTYPE_DEFAULT,
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};
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enum l2tp_encap_type {
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L2TP_ENCAPTYPE_UDP,
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L2TP_ENCAPTYPE_IP,
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};
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enum l2tp_seqmode {
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L2TP_SEQ_NONE = 0,
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L2TP_SEQ_IP = 1,
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L2TP_SEQ_ALL = 2,
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};
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/*
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* NETLINK_GENERIC related info
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*/
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#define L2TP_GENL_NAME "l2tp"
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#define L2TP_GENL_VERSION 0x1
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#endif
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