/*
* ipl2tp.c "ip l2tp"
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Original Author: James Chapman <jchapman@katalix.com>
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/ip.h>
#include <linux/genetlink.h>
#include <linux/l2tp.h>
#include "utils.h"
#include "ip_common.h"
enum {
L2TP_ADD,
L2TP_CHG,
L2TP_DEL,
L2TP_GET
};
struct l2tp_parm {
uint32_t tunnel_id;
uint32_t peer_tunnel_id;
uint32_t session_id;
uint32_t peer_session_id;
uint32_t offset;
uint32_t peer_offset;
enum l2tp_encap_type encap;
uint16_t local_udp_port;
uint16_t peer_udp_port;
int cookie_len;
uint8_t cookie[8];
int peer_cookie_len;
uint8_t peer_cookie[8];
struct in_addr local_ip;
struct in_addr peer_ip;
uint16_t pw_type;
uint16_t mtu;
int udp_csum:1;
int recv_seq:1;
int send_seq:1;
int lns_mode:1;
int data_seq:2;
int tunnel:1;
int session:1;
int reorder_timeout;
const char *ifname;
};
struct l2tp_stats {
uint64_t data_rx_packets;
uint64_t data_rx_bytes;
uint64_t data_rx_errors;
uint64_t data_rx_oos_packets;
uint64_t data_rx_oos_discards;
uint64_t data_tx_packets;
uint64_t data_tx_bytes;
uint64_t data_tx_errors;
};
struct l2tp_data {
struct l2tp_parm config;
struct l2tp_stats stats;
};
/* netlink socket */
static struct rtnl_handle genl_rth;
static int genl_family = -1;
/*****************************************************************************
* Netlink actions
*****************************************************************************/
static int create_tunnel(struct l2tp_parm *p)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[1024];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = genl_family;
req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
req.g.cmd = L2TP_CMD_TUNNEL_CREATE;
req.g.version = L2TP_GENL_VERSION;
addattr32(&req.n, 1024, L2TP_ATTR_CONN_ID, p->tunnel_id);
addattr32(&req.n, 1024, L2TP_ATTR_PEER_CONN_ID, p->peer_tunnel_id);
addattr8(&req.n, 1024, L2TP_ATTR_PROTO_VERSION, 3);
addattr16(&req.n, 1024, L2TP_ATTR_ENCAP_TYPE, p->encap);
addattr32(&req.n, 1024, L2TP_ATTR_IP_SADDR, p->local_ip.s_addr);
addattr32(&req.n, 1024, L2TP_ATTR_IP_DADDR, p->peer_ip.s_addr);
if (p->encap == L2TP_ENCAPTYPE_UDP) {
addattr16(&req.n, 1024, L2TP_ATTR_UDP_SPORT, p->local_udp_port);
addattr16(&req.n, 1024, L2TP_ATTR_UDP_DPORT, p->peer_udp_port);
}
if (rtnl_talk(&genl_rth, &req.n, 0, 0, NULL) < 0)
return -2;
return 0;
}
static int delete_tunnel(struct l2tp_parm *p)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[128];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = genl_family;
req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
req.g.cmd = L2TP_CMD_TUNNEL_DELETE;
req.g.version = L2TP_GENL_VERSION;
addattr32(&req.n, 128, L2TP_ATTR_CONN_ID, p->tunnel_id);
if (rtnl_talk(&genl_rth, &req.n, 0, 0, NULL) < 0)
return -2;
return 0;
}
static int create_session(struct l2tp_parm *p)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[1024];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = genl_family;
req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
req.g.cmd = L2TP_CMD_SESSION_CREATE;
req.g.version = L2TP_GENL_VERSION;
addattr32(&req.n, 1024, L2TP_ATTR_CONN_ID, p->tunnel_id);
addattr32(&req.n, 1024, L2TP_ATTR_PEER_CONN_ID, p->peer_tunnel_id);
addattr32(&req.n, 1024, L2TP_ATTR_SESSION_ID, p->session_id);
addattr32(&req.n, 1024, L2TP_ATTR_PEER_SESSION_ID, p->peer_session_id);
addattr16(&req.n, 1024, L2TP_ATTR_PW_TYPE, p->pw_type);
if (p->mtu) addattr16(&req.n, 1024, L2TP_ATTR_MTU, p->mtu);
if (p->recv_seq) addattr(&req.n, 1024, L2TP_ATTR_RECV_SEQ);
if (p->send_seq) addattr(&req.n, 1024, L2TP_ATTR_SEND_SEQ);
if (p->lns_mode) addattr(&req.n, 1024, L2TP_ATTR_LNS_MODE);
if (p->data_seq) addattr8(&req.n, 1024, L2TP_ATTR_DATA_SEQ, p->data_seq);
if (p->reorder_timeout) addattr64(&req.n, 1024, L2TP_ATTR_RECV_TIMEOUT,
p->reorder_timeout);
if (p->offset) addattr16(&req.n, 1024, L2TP_ATTR_OFFSET, p->offset);
if (p->cookie_len) addattr_l(&req.n, 1024, L2TP_ATTR_COOKIE,
p->cookie, p->cookie_len);
if (p->peer_cookie_len) addattr_l(&req.n, 1024, L2TP_ATTR_PEER_COOKIE,
p->peer_cookie, p->peer_cookie_len);
if (p->ifname && p->ifname[0])
addattrstrz(&req.n, 1024, L2TP_ATTR_IFNAME, p->ifname);
if (rtnl_talk(&genl_rth, &req.n, 0, 0, NULL) < 0)
return -2;
return 0;
}
static int delete_session(struct l2tp_parm *p)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[128];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = genl_family;
req.n.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
req.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
req.g.cmd = L2TP_CMD_SESSION_DELETE;
req.g.version = L2TP_GENL_VERSION;
addattr32(&req.n, 1024, L2TP_ATTR_CONN_ID, p->tunnel_id);
addattr32(&req.n, 1024, L2TP_ATTR_SESSION_ID, p->session_id);
if (rtnl_talk(&genl_rth, &req.n, 0, 0, NULL) < 0)
return -2;
return 0;
}
static void print_cookie(char *name, const uint8_t *cookie, int len)
{
printf(" %s %02x%02x%02x%02x", name,
cookie[0], cookie[1],
cookie[2], cookie[3]);
if (len == 8)
printf("%02x%02x%02x%02x",
cookie[4], cookie[5],
cookie[6], cookie[7]);
}
static void print_tunnel(const struct l2tp_data *data)
{
const struct l2tp_parm *p = &data->config;
printf("Tunnel %u, encap %s\n",
p->tunnel_id,
p->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
p->encap == L2TP_ENCAPTYPE_IP ? "IP" : "??");
printf(" From %s ", inet_ntoa(p->local_ip));
printf("to %s\n", inet_ntoa(p->peer_ip));
printf(" Peer tunnel %u\n",
p->peer_tunnel_id);
if (p->encap == L2TP_ENCAPTYPE_UDP)
printf(" UDP source / dest ports: %hu/%hu\n",
p->local_udp_port, p->peer_udp_port);
}
static void print_session(struct l2tp_data *data)
{
struct l2tp_parm *p = &data->config;
printf("Session %u in tunnel %u\n",
p->session_id, p->tunnel_id);
printf(" Peer session %u, tunnel %u\n",
p->peer_session_id, p->peer_tunnel_id);
if (p->ifname != NULL) {
printf(" interface name: %s\n", p->ifname);
}
printf(" offset %u, peer offset %u\n",
p->offset, p->peer_offset);
if (p->cookie_len > 0)
print_cookie("cookie", p->cookie, p->cookie_len);
if (p->peer_cookie_len > 0)
print_cookie("peer cookie", p->peer_cookie, p->peer_cookie_len);
if (p->reorder_timeout != 0) {
printf(" reorder timeout: %u\n", p->reorder_timeout);
}
}
static int get_response(struct nlmsghdr *n, void *arg)
{
struct genlmsghdr *ghdr;
struct l2tp_data *data = arg;
struct l2tp_parm *p = &data->config;
struct rtattr *attrs[L2TP_ATTR_MAX + 1];
struct rtattr *nla_stats;
int len;
/* Validate message and parse attributes */
if (n->nlmsg_type == NLMSG_ERROR)
return -EBADMSG;
ghdr = NLMSG_DATA(n);
len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*ghdr));
if (len < 0)
return -1;
parse_rtattr(attrs, L2TP_ATTR_MAX, (void *)ghdr + GENL_HDRLEN, len);
if (attrs[L2TP_ATTR_PW_TYPE])
p->pw_type = rta_getattr_u16(attrs[L2TP_ATTR_PW_TYPE]);
if (attrs[L2TP_ATTR_ENCAP_TYPE])
p->encap = rta_getattr_u16(attrs[L2TP_ATTR_ENCAP_TYPE]);
if (attrs[L2TP_ATTR_OFFSET])
p->offset = rta_getattr_u16(attrs[L2TP_ATTR_OFFSET]);
if (attrs[L2TP_ATTR_DATA_SEQ])
p->data_seq = rta_getattr_u16(attrs[L2TP_ATTR_DATA_SEQ]);
if (attrs[L2TP_ATTR_CONN_ID])
p->tunnel_id = rta_getattr_u32(attrs[L2TP_ATTR_CONN_ID]);
if (attrs[L2TP_ATTR_PEER_CONN_ID])
p->peer_tunnel_id = rta_getattr_u32(attrs[L2TP_ATTR_PEER_CONN_ID]);
if (attrs[L2TP_ATTR_SESSION_ID])
p->session_id = rta_getattr_u32(attrs[L2TP_ATTR_SESSION_ID]);
if (attrs[L2TP_ATTR_PEER_SESSION_ID])
p->peer_session_id = rta_getattr_u32(attrs[L2TP_ATTR_PEER_SESSION_ID]);
p->udp_csum = !!attrs[L2TP_ATTR_UDP_CSUM];
if (attrs[L2TP_ATTR_COOKIE])
memcpy(p->cookie, RTA_DATA(attrs[L2TP_ATTR_COOKIE]),
p->cookie_len = RTA_PAYLOAD(attrs[L2TP_ATTR_COOKIE]));
if (attrs[L2TP_ATTR_PEER_COOKIE])
memcpy(p->peer_cookie, RTA_DATA(attrs[L2TP_ATTR_PEER_COOKIE]),
p->peer_cookie_len = RTA_PAYLOAD(attrs[L2TP_ATTR_PEER_COOKIE]));
p->recv_seq = !!attrs[L2TP_ATTR_RECV_SEQ];
p->send_seq = !!attrs[L2TP_ATTR_SEND_SEQ];
if (attrs[L2TP_ATTR_RECV_TIMEOUT])
p->reorder_timeout = rta_getattr_u64(attrs[L2TP_ATTR_RECV_TIMEOUT]);
if (attrs[L2TP_ATTR_IP_SADDR])
p->local_ip.s_addr = rta_getattr_u32(attrs[L2TP_ATTR_IP_SADDR]);
if (attrs[L2TP_ATTR_IP_DADDR])
p->peer_ip.s_addr = rta_getattr_u32(attrs[L2TP_ATTR_IP_DADDR]);
if (attrs[L2TP_ATTR_UDP_SPORT])
p->local_udp_port = rta_getattr_u16(attrs[L2TP_ATTR_UDP_SPORT]);
if (attrs[L2TP_ATTR_UDP_DPORT])
p->peer_udp_port = rta_getattr_u16(attrs[L2TP_ATTR_UDP_DPORT]);
if (attrs[L2TP_ATTR_MTU])
p->mtu = rta_getattr_u16(attrs[L2TP_ATTR_MTU]);
if (attrs[L2TP_ATTR_IFNAME])
p->ifname = rta_getattr_str(attrs[L2TP_ATTR_IFNAME]);
nla_stats = attrs[L2TP_ATTR_STATS];
if (nla_stats) {
struct rtattr *tb[L2TP_ATTR_STATS_MAX + 1];
parse_rtattr_nested(tb, L2TP_ATTR_STATS_MAX, nla_stats);
if (tb[L2TP_ATTR_TX_PACKETS])
data->stats.data_tx_packets = rta_getattr_u64(tb[L2TP_ATTR_TX_PACKETS]);
if (tb[L2TP_ATTR_TX_BYTES])
data->stats.data_tx_bytes = rta_getattr_u64(tb[L2TP_ATTR_TX_BYTES]);
if (tb[L2TP_ATTR_TX_ERRORS])
data->stats.data_tx_errors = rta_getattr_u64(tb[L2TP_ATTR_TX_ERRORS]);
if (tb[L2TP_ATTR_RX_PACKETS])
data->stats.data_rx_packets = rta_getattr_u64(tb[L2TP_ATTR_RX_PACKETS]);
if (tb[L2TP_ATTR_RX_BYTES])
data->stats.data_rx_bytes = rta_getattr_u64(tb[L2TP_ATTR_RX_BYTES]);
if (tb[L2TP_ATTR_RX_ERRORS])
data->stats.data_rx_errors = rta_getattr_u64(tb[L2TP_ATTR_RX_ERRORS]);
if (tb[L2TP_ATTR_RX_SEQ_DISCARDS])
data->stats.data_rx_oos_discards = rta_getattr_u64(tb[L2TP_ATTR_RX_SEQ_DISCARDS]);
if (tb[L2TP_ATTR_RX_OOS_PACKETS])
data->stats.data_rx_oos_packets = rta_getattr_u64(tb[L2TP_ATTR_RX_OOS_PACKETS]);
}
return 0;
}
static int session_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
int ret = get_response(n, arg);
if (ret == 0)
print_session(arg);
return ret;
}
static int get_session(struct l2tp_data *p)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[128];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
req.n.nlmsg_type = genl_family;
req.n.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
req.n.nlmsg_seq = genl_rth.dump = ++genl_rth.seq;
req.g.cmd = L2TP_CMD_SESSION_GET;
req.g.version = L2TP_GENL_VERSION;
if (p->config.tunnel_id && p->config.session_id) {
addattr32(&req.n, 128, L2TP_ATTR_CONN_ID, p->config.tunnel_id);
addattr32(&req.n, 128, L2TP_ATTR_SESSION_ID, p->config.session_id);
}
if (rtnl_send(&genl_rth, &req, req.n.nlmsg_len) < 0)
return -2;
if (rtnl_dump_filter(&genl_rth, session_nlmsg, p) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
return 0;
}
static int tunnel_nlmsg(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
int ret = get_response(n, arg);
if (ret == 0)
print_tunnel(arg);
return ret;
}
static int get_tunnel(struct l2tp_data *p)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[1024];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
req.n.nlmsg_type = genl_family;
req.n.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
req.n.nlmsg_seq = genl_rth.dump = ++genl_rth.seq;
req.g.cmd = L2TP_CMD_TUNNEL_GET;
req.g.version = L2TP_GENL_VERSION;
if (p->config.tunnel_id)
addattr32(&req.n, 1024, L2TP_ATTR_CONN_ID, p->config.tunnel_id);
if (rtnl_send(&genl_rth, &req, req.n.nlmsg_len) < 0)
return -2;
if (rtnl_dump_filter(&genl_rth, tunnel_nlmsg, p) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
return 0;
}
/*****************************************************************************
* Command parser
*****************************************************************************/
static int hex(char ch)
{
if ((ch >= 'a') && (ch <= 'f'))
return ch - 'a' + 10;
if ((ch >= '0') && (ch <= '9'))
return ch - '0';
if ((ch >= 'A') && (ch <= 'F'))
return ch - 'A' + 10;
return -1;
}
static int hex2mem(const char *buf, uint8_t *mem, int count)
{
int i, j;
int c;
for (i = 0, j = 0; i < count; i++, j += 2) {
c = hex(buf[j]);
if (c < 0)
goto err;
mem[i] = c << 4;
c = hex(buf[j + 1]);
if (c < 0)
goto err;
mem[i] |= c;
}
return 0;
err:
return -1;
}
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip l2tp add tunnel\n");
fprintf(stderr, " remote ADDR local ADDR\n");
fprintf(stderr, " tunnel_id ID peer_tunnel_id ID\n");
fprintf(stderr, " [ encap { ip | udp } ]\n");
fprintf(stderr, " [ udp_sport PORT ] [ udp_dport PORT ]\n");
fprintf(stderr, "Usage: ip l2tp add session [ name NAME ]\n");
fprintf(stderr, " tunnel_id ID\n");
fprintf(stderr, " session_id ID peer_session_id ID\n");
fprintf(stderr, " [ cookie HEXSTR ] [ peer_cookie HEXSTR ]\n");
fprintf(stderr, " [ offset OFFSET ] [ peer_offset OFFSET ]\n");
fprintf(stderr, " ip l2tp del tunnel tunnel_id ID\n");
fprintf(stderr, " ip l2tp del session tunnel_id ID session_id ID\n");
fprintf(stderr, " ip l2tp show tunnel [ tunnel_id ID ]\n");
fprintf(stderr, " ip l2tp show session [ tunnel_id ID ] [ session_id ID ]\n");
fprintf(stderr, "\n");
fprintf(stderr, "Where: NAME := STRING\n");
fprintf(stderr, " ADDR := { IP_ADDRESS | any }\n");
fprintf(stderr, " PORT := { 0..65535 }\n");
fprintf(stderr, " ID := { 1..4294967295 }\n");
fprintf(stderr, " HEXSTR := { 8 or 16 hex digits (4 / 8 bytes) }\n");
exit(-1);
}
static int parse_args(int argc, char **argv, int cmd, struct l2tp_parm *p)
{
memset(p, 0, sizeof(*p));
if (argc == 0)
usage();
while (argc > 0) {
if (strcmp(*argv, "encap") == 0) {
NEXT_ARG();
if (strcmp(*argv, "ip") == 0) {
p->encap = L2TP_ENCAPTYPE_IP;
} else if (strcmp(*argv, "udp") == 0) {
p->encap = L2TP_ENCAPTYPE_UDP;
} else {
fprintf(stderr, "Unknown tunnel encapsulation.\n");
exit(-1);
}
} else if (strcmp(*argv, "name") == 0) {
NEXT_ARG();
p->ifname = *argv;
} else if (strcmp(*argv, "remote") == 0) {
NEXT_ARG();
p->peer_ip.s_addr = get_addr32(*argv);
} else if (strcmp(*argv, "local") == 0) {
NEXT_ARG();
p->local_ip.s_addr = get_addr32(*argv);
} else if ((strcmp(*argv, "tunnel_id") == 0) ||
(strcmp(*argv, "tid") == 0)) {
__u32 uval;
NEXT_ARG();
if (get_u32(&uval, *argv, 0))
invarg("invalid ID\n", *argv);
p->tunnel_id = uval;
} else if ((strcmp(*argv, "peer_tunnel_id") == 0) ||
(strcmp(*argv, "ptid") == 0)) {
__u32 uval;
NEXT_ARG();
if (get_u32(&uval, *argv, 0))
invarg("invalid ID\n", *argv);
p->peer_tunnel_id = uval;
} else if ((strcmp(*argv, "session_id") == 0) ||
(strcmp(*argv, "sid") == 0)) {
__u32 uval;
NEXT_ARG();
if (get_u32(&uval, *argv, 0))
invarg("invalid ID\n", *argv);
p->session_id = uval;
} else if ((strcmp(*argv, "peer_session_id") == 0) ||
(strcmp(*argv, "psid") == 0)) {
__u32 uval;
NEXT_ARG();
if (get_u32(&uval, *argv, 0))
invarg("invalid ID\n", *argv);
p->peer_session_id = uval;
} else if (strcmp(*argv, "udp_sport") == 0) {
__u16 uval;
NEXT_ARG();
if (get_u16(&uval, *argv, 0))
invarg("invalid port\n", *argv);
p->local_udp_port = uval;
} else if (strcmp(*argv, "udp_dport") == 0) {
__u16 uval;
NEXT_ARG();
if (get_u16(&uval, *argv, 0))
invarg("invalid port\n", *argv);
p->peer_udp_port = uval;
} else if (strcmp(*argv, "offset") == 0) {
__u8 uval;
NEXT_ARG();
if (get_u8(&uval, *argv, 0))
invarg("invalid offset\n", *argv);
p->offset = uval;
} else if (strcmp(*argv, "peer_offset") == 0) {
__u8 uval;
NEXT_ARG();
if (get_u8(&uval, *argv, 0))
invarg("invalid offset\n", *argv);
p->peer_offset = uval;
} else if (strcmp(*argv, "cookie") == 0) {
int slen;
NEXT_ARG();
slen = strlen(*argv);
if ((slen != 8) && (slen != 16))
invarg("cookie must be either 8 or 16 hex digits\n", *argv);
p->cookie_len = slen / 2;
if (hex2mem(*argv, p->cookie, p->cookie_len) < 0)
invarg("cookie must be a hex string\n", *argv);
} else if (strcmp(*argv, "peer_cookie") == 0) {
int slen;
NEXT_ARG();
slen = strlen(*argv);
if ((slen != 8) && (slen != 16))
invarg("cookie must be either 8 or 16 hex digits\n", *argv);
p->peer_cookie_len = slen / 2;
if (hex2mem(*argv, p->peer_cookie, p->peer_cookie_len) < 0)
invarg("cookie must be a hex string\n", *argv);
} else if (strcmp(*argv, "tunnel") == 0) {
p->tunnel = 1;
} else if (strcmp(*argv, "session") == 0) {
p->session = 1;
} else if (matches(*argv, "help") == 0) {
usage();
} else {
fprintf(stderr, "Unknown command: %s\n", *argv);
usage();
}
argc--; argv++;
}
return 0;
}
static int do_add(int argc, char **argv)
{
struct l2tp_parm p;
int ret = 0;
if (parse_args(argc, argv, L2TP_ADD, &p) < 0)
return -1;
if (!p.tunnel && !p.session)
missarg("tunnel or session");
if (p.tunnel_id == 0)
missarg("tunnel_id");
/* session_id and peer_session_id must be provided for sessions */
if ((p.session) && (p.peer_session_id == 0))
missarg("peer_session_id");
if ((p.session) && (p.session_id == 0))
missarg("session_id");
/* peer_tunnel_id is needed for tunnels */
if ((p.tunnel) && (p.peer_tunnel_id == 0))
missarg("peer_tunnel_id");
if (p.tunnel) {
if (p.local_ip.s_addr == 0)
missarg("local");
if (p.peer_ip.s_addr == 0)
missarg("remote");
if (p.encap == L2TP_ENCAPTYPE_UDP) {
if (p.local_udp_port == 0)
missarg("udp_sport");
if (p.peer_udp_port == 0)
missarg("udp_dport");
}
ret = create_tunnel(&p);
}
if (p.session) {
/* Only ethernet pseudowires supported */
p.pw_type = L2TP_PWTYPE_ETH;
ret = create_session(&p);
}
return ret;
}
static int do_del(int argc, char **argv)
{
struct l2tp_parm p;
if (parse_args(argc, argv, L2TP_DEL, &p) < 0)
return -1;
if (!p.tunnel && !p.session)
missarg("tunnel or session");
if ((p.tunnel) && (p.tunnel_id == 0))
missarg("tunnel_id");
if ((p.session) && (p.session_id == 0))
missarg("session_id");
if (p.session_id)
return delete_session(&p);
else
return delete_tunnel(&p);
return -1;
}
static int do_show(int argc, char **argv)
{
struct l2tp_data data;
struct l2tp_parm *p = &data.config;
if (parse_args(argc, argv, L2TP_GET, p) < 0)
return -1;
if (!p->tunnel && !p->session)
missarg("tunnel or session");
if (p->session)
get_session(&data);
else
get_tunnel(&data);
return 0;
}
static int genl_parse_getfamily(struct nlmsghdr *nlh)
{
struct rtattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr *ghdr = NLMSG_DATA(nlh);
int len = nlh->nlmsg_len;
struct rtattr *attrs;
if (nlh->nlmsg_type != GENL_ID_CTRL) {
fprintf(stderr, "Not a controller message, nlmsg_len=%d "
"nlmsg_type=0x%x\n", nlh->nlmsg_len, nlh->nlmsg_type);
return -1;
}
if (ghdr->cmd != CTRL_CMD_NEWFAMILY) {
fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd);
return -1;
}
len -= NLMSG_LENGTH(GENL_HDRLEN);
if (len < 0) {
fprintf(stderr, "wrong controller message len %d\n", len);
return -1;
}
attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN);
parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len);
if (tb[CTRL_ATTR_FAMILY_ID] == NULL) {
fprintf(stderr, "Missing family id TLV\n");
return -1;
}
return rta_getattr_u16(tb[CTRL_ATTR_FAMILY_ID]);
}
int genl_ctrl_resolve_family(const char *family)
{
struct {
struct nlmsghdr n;
struct genlmsghdr g;
char buf[1024];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = GENL_ID_CTRL;
req.g.cmd = CTRL_CMD_GETFAMILY;
addattr_l(&req.n, 1024, CTRL_ATTR_FAMILY_NAME,
family, strlen(family) + 1);
if (rtnl_talk(&genl_rth, &req.n, 0, 0, &req.n) < 0) {
fprintf(stderr, "Error talking to the kernel\n");
return -2;
}
return genl_parse_getfamily(&req.n);
}
int do_ipl2tp(int argc, char **argv)
{
if (genl_family < 0) {
if (rtnl_open_byproto(&genl_rth, 0, NETLINK_GENERIC) < 0) {
fprintf(stderr, "Cannot open generic netlink socket\n");
exit(1);
}
genl_family = genl_ctrl_resolve_family(L2TP_GENL_NAME);
if (genl_family < 0)
exit(1);
}
if (argc < 1)
usage();
if (matches(*argv, "add") == 0)
return do_add(argc-1, argv+1);
if (matches(*argv, "del") == 0)
return do_del(argc-1, argv+1);
if (matches(*argv, "show") == 0 ||
matches(*argv, "lst") == 0 ||
matches(*argv, "list") == 0)
return do_show(argc-1, argv+1);
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Command \"%s\" is unknown, try \"ip l2tp help\".\n", *argv);
exit(-1);
}