/*
* 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 "libgenl.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;
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];
inet_prefix local_ip;
inet_prefix peer_ip;
uint16_t pw_type;
unsigned int udp6_csum_tx:1;
unsigned int udp6_csum_rx:1;
unsigned int udp_csum:1;
unsigned int recv_seq:1;
unsigned int send_seq:1;
unsigned int tunnel:1;
unsigned int session:1;
int reorder_timeout;
const char *ifname;
uint8_t l2spec_type;
uint8_t l2spec_len;
};
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)
{
uint32_t local_attr = L2TP_ATTR_IP_SADDR;
uint32_t peer_attr = L2TP_ATTR_IP_DADDR;
GENL_REQUEST(req, 1024, genl_family, 0, L2TP_GENL_VERSION,
L2TP_CMD_TUNNEL_CREATE, NLM_F_REQUEST | NLM_F_ACK);
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);
if (p->local_ip.family == AF_INET6)
local_attr = L2TP_ATTR_IP6_SADDR;
addattr_l(&req.n, 1024, local_attr, &p->local_ip.data,
p->local_ip.bytelen);
if (p->peer_ip.family == AF_INET6)
peer_attr = L2TP_ATTR_IP6_DADDR;
addattr_l(&req.n, 1024, peer_attr, &p->peer_ip.data,
p->peer_ip.bytelen);
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 (p->udp_csum)
addattr8(&req.n, 1024, L2TP_ATTR_UDP_CSUM, 1);
if (!p->udp6_csum_tx)
addattr(&req.n, 1024, L2TP_ATTR_UDP_ZERO_CSUM6_TX);
if (!p->udp6_csum_rx)
addattr(&req.n, 1024, L2TP_ATTR_UDP_ZERO_CSUM6_RX);
}
if (rtnl_talk(&genl_rth, &req.n, NULL) < 0)
return -2;
return 0;
}
static int delete_tunnel(struct l2tp_parm *p)
{
GENL_REQUEST(req, 128, genl_family, 0, L2TP_GENL_VERSION,
L2TP_CMD_TUNNEL_DELETE, NLM_F_REQUEST | NLM_F_ACK);
addattr32(&req.n, 128, L2TP_ATTR_CONN_ID, p->tunnel_id);
if (rtnl_talk(&genl_rth, &req.n, NULL) < 0)
return -2;
return 0;
}
static int create_session(struct l2tp_parm *p)
{
GENL_REQUEST(req, 1024, genl_family, 0, L2TP_GENL_VERSION,
L2TP_CMD_SESSION_CREATE, NLM_F_REQUEST | NLM_F_ACK);
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);
addattr8(&req.n, 1024, L2TP_ATTR_L2SPEC_TYPE, p->l2spec_type);
addattr8(&req.n, 1024, L2TP_ATTR_L2SPEC_LEN, p->l2spec_len);
if (p->recv_seq)
addattr8(&req.n, 1024, L2TP_ATTR_RECV_SEQ, 1);
if (p->send_seq)
addattr8(&req.n, 1024, L2TP_ATTR_SEND_SEQ, 1);
if (p->reorder_timeout)
addattr64(&req.n, 1024, L2TP_ATTR_RECV_TIMEOUT,
p->reorder_timeout);
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)
addattrstrz(&req.n, 1024, L2TP_ATTR_IFNAME, p->ifname);
if (rtnl_talk(&genl_rth, &req.n, NULL) < 0)
return -2;
return 0;
}
static int delete_session(struct l2tp_parm *p)
{
GENL_REQUEST(req, 1024, genl_family, 0, L2TP_GENL_VERSION,
L2TP_CMD_SESSION_DELETE, NLM_F_REQUEST | NLM_F_ACK);
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, NULL) < 0)
return -2;
return 0;
}
static void print_cookie(const char *name, const char *fmt,
const uint8_t *cookie, int len)
{
char abuf[32];
size_t n;
n = snprintf(abuf, sizeof(abuf),
"%02x%02x%02x%02x",
cookie[0], cookie[1], cookie[2], cookie[3]);
if (len == 8)
snprintf(abuf + n, sizeof(abuf) - n,
"%02x%02x%02x%02x",
cookie[4], cookie[5],
cookie[6], cookie[7]);
print_string(PRINT_ANY, name, fmt, abuf);
}
static void print_tunnel(const struct l2tp_data *data)
{
const struct l2tp_parm *p = &data->config;
char buf[INET6_ADDRSTRLEN];
open_json_object(NULL);
print_uint(PRINT_ANY, "tunnel_id", "Tunnel %u,", p->tunnel_id);
print_string(PRINT_ANY, "encap", " encap %s",
p->encap == L2TP_ENCAPTYPE_UDP ? "UDP" :
p->encap == L2TP_ENCAPTYPE_IP ? "IP" : "??");
print_nl();
print_string(PRINT_ANY, "local", " From %s ",
inet_ntop(p->local_ip.family, p->local_ip.data,
buf, sizeof(buf)));
print_string(PRINT_ANY, "peer", "to %s",
inet_ntop(p->peer_ip.family, p->peer_ip.data,
buf, sizeof(buf)));
print_nl();
print_uint(PRINT_ANY, "peer_tunnel", " Peer tunnel %u",
p->peer_tunnel_id);
print_nl();
if (p->encap == L2TP_ENCAPTYPE_UDP) {
print_string(PRINT_FP, NULL,
" UDP source / dest ports:", NULL);
print_hu(PRINT_ANY, "local_port", " %hu",
p->local_udp_port);
print_hu(PRINT_ANY, "peer_port", "/%hu",
p->peer_udp_port);
print_nl();
switch (p->local_ip.family) {
case AF_INET:
print_bool(PRINT_JSON, "checksum",
NULL, p->udp_csum);
print_string(PRINT_FP, NULL,
" UDP checksum: %s\n",
p->udp_csum ? "enabled" : "disabled");
break;
case AF_INET6:
if (is_json_context()) {
print_bool(PRINT_JSON, "checksum_tx",
NULL, p->udp6_csum_tx);
print_bool(PRINT_JSON, "checksum_rx",
NULL, p->udp6_csum_tx);
} else {
printf(" UDP checksum: %s%s%s%s\n",
p->udp6_csum_tx && p->udp6_csum_rx
? "enabled" : "",
p->udp6_csum_tx && !p->udp6_csum_rx
? "tx" : "",
!p->udp6_csum_tx && p->udp6_csum_rx
? "rx" : "",
!p->udp6_csum_tx && !p->udp6_csum_rx
? "disabled" : "");
}
break;
}
}
close_json_object();
}
static void print_session(struct l2tp_data *data)
{
struct l2tp_parm *p = &data->config;
open_json_object(NULL);
print_uint(PRINT_ANY, "session_id", "Session %u", p->session_id);
print_uint(PRINT_ANY, "tunnel_id", " in tunnel %u", p->tunnel_id);
print_nl();
print_uint(PRINT_ANY, "peer_session_id",
" Peer session %u,", p->peer_session_id);
print_uint(PRINT_ANY, "peer_tunnel_id",
" tunnel %u", p->peer_tunnel_id);
print_nl();
if (p->ifname != NULL) {
print_color_string(PRINT_ANY, COLOR_IFNAME,
"interface", " interface name: %s" , p->ifname);
print_nl();
}
/* Show offsets only for plain console output (for legacy scripts) */
print_uint(PRINT_FP, "offset", " offset %u,", 0);
print_uint(PRINT_FP, "peer_offset", " peer offset %u\n", 0);
if (p->cookie_len > 0)
print_cookie("cookie", " cookie %s",
p->cookie, p->cookie_len);
if (p->peer_cookie_len > 0)
print_cookie("peer_cookie", " peer cookie %s",
p->peer_cookie, p->peer_cookie_len);
if (p->reorder_timeout != 0)
print_uint(PRINT_ANY, "reorder_timeout",
" reorder timeout: %u", p->reorder_timeout);
if (p->send_seq || p->recv_seq) {
print_string(PRINT_FP, NULL, "%s sequence numbering:", _SL_);
if (p->send_seq)
print_null(PRINT_ANY, "send_seq", " send", NULL);
if (p->recv_seq)
print_null(PRINT_ANY, "recv_seq", " recv", NULL);
}
print_string(PRINT_FP, NULL, "\n", NULL);
close_json_object();
}
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, *rta;
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_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]);
if (attrs[L2TP_ATTR_L2SPEC_TYPE])
p->l2spec_type = rta_getattr_u8(attrs[L2TP_ATTR_L2SPEC_TYPE]);
if (attrs[L2TP_ATTR_L2SPEC_LEN])
p->l2spec_len = rta_getattr_u8(attrs[L2TP_ATTR_L2SPEC_LEN]);
if (attrs[L2TP_ATTR_UDP_CSUM])
p->udp_csum = !!rta_getattr_u8(attrs[L2TP_ATTR_UDP_CSUM]);
p->udp6_csum_tx = !attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX];
p->udp6_csum_rx = !attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX];
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]));
if (attrs[L2TP_ATTR_RECV_SEQ])
p->recv_seq = !!rta_getattr_u8(attrs[L2TP_ATTR_RECV_SEQ]);
if (attrs[L2TP_ATTR_SEND_SEQ])
p->send_seq = !!rta_getattr_u8(attrs[L2TP_ATTR_SEND_SEQ]);
if (attrs[L2TP_ATTR_RECV_TIMEOUT])
p->reorder_timeout = rta_getattr_u64(attrs[L2TP_ATTR_RECV_TIMEOUT]);
rta = attrs[L2TP_ATTR_IP_SADDR];
p->local_ip.family = AF_INET;
if (!rta) {
rta = attrs[L2TP_ATTR_IP6_SADDR];
p->local_ip.family = AF_INET6;
}
if (rta && get_addr_rta(&p->local_ip, rta, p->local_ip.family))
return -1;
rta = attrs[L2TP_ATTR_IP_DADDR];
p->peer_ip.family = AF_INET;
if (!rta) {
rta = attrs[L2TP_ATTR_IP6_DADDR];
p->peer_ip.family = AF_INET6;
}
if (rta && get_addr_rta(&p->peer_ip, rta, p->peer_ip.family))
return -1;
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_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(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)
{
GENL_REQUEST(req, 128, genl_family, 0, L2TP_GENL_VERSION,
L2TP_CMD_SESSION_GET,
NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST);
req.n.nlmsg_seq = genl_rth.dump = ++genl_rth.seq;
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;
new_json_obj(json);
if (rtnl_dump_filter(&genl_rth, session_nlmsg, p) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
delete_json_obj();
fflush(stdout);
return 0;
}
static int tunnel_nlmsg(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)
{
GENL_REQUEST(req, 1024, genl_family, 0, L2TP_GENL_VERSION,
L2TP_CMD_TUNNEL_GET,
NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST);
req.n.nlmsg_seq = genl_rth.dump = ++genl_rth.seq;
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;
new_json_obj(json);
if (rtnl_dump_filter(&genl_rth, tunnel_nlmsg, p) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
delete_json_obj();
fflush(stdout);
return 0;
}
/*****************************************************************************
* Command parser
*****************************************************************************/
static void usage(void) __attribute__((noreturn));
static void usage(void)
{
fprintf(stderr, "Usage: ip l2tp add tunnel\n"
" remote ADDR local ADDR\n"
" tunnel_id ID peer_tunnel_id ID\n"
" [ encap { ip | udp } ]\n"
" [ udp_sport PORT ] [ udp_dport PORT ]\n"
" [ udp_csum { on | off } ]\n"
" [ udp6_csum_tx { on | off } ]\n"
" [ udp6_csum_rx { on | off } ]\n"
"Usage: ip l2tp add session [ name NAME ]\n"
" tunnel_id ID\n"
" session_id ID peer_session_id ID\n"
" [ cookie HEXSTR ] [ peer_cookie HEXSTR ]\n"
" [ seq { none | send | recv | both } ]\n"
" [ l2spec_type L2SPEC ]\n"
" ip l2tp del tunnel tunnel_id ID\n"
" ip l2tp del session tunnel_id ID session_id ID\n"
" ip l2tp show tunnel [ tunnel_id ID ]\n"
" ip l2tp show session [ tunnel_id ID ] [ session_id ID ]\n"
"\n"
"Where: NAME := STRING\n"
" ADDR := { IP_ADDRESS | any }\n"
" PORT := { 0..65535 }\n"
" ID := { 1..4294967295 }\n"
" HEXSTR := { 8 or 16 hex digits (4 / 8 bytes) }\n"
" L2SPEC := { none | default }\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();
/* Defaults */
p->l2spec_type = L2TP_L2SPECTYPE_DEFAULT;
p->l2spec_len = 4;
p->udp6_csum_rx = 1;
p->udp6_csum_tx = 1;
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 \"%s\"\n", *argv);
exit(-1);
}
} else if (strcmp(*argv, "name") == 0) {
NEXT_ARG();
if (check_ifname(*argv))
invarg("\"name\" not a valid ifname", *argv);
p->ifname = *argv;
} else if (strcmp(*argv, "remote") == 0) {
NEXT_ARG();
if (get_addr(&p->peer_ip, *argv, AF_UNSPEC))
invarg("invalid remote address\n", *argv);
} else if (strcmp(*argv, "local") == 0) {
NEXT_ARG();
if (get_addr(&p->local_ip, *argv, AF_UNSPEC))
invarg("invalid local address\n", *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, "udp_csum") == 0) {
NEXT_ARG();
if (strcmp(*argv, "on") == 0)
p->udp_csum = 1;
else if (strcmp(*argv, "off") == 0)
p->udp_csum = 0;
else
invarg("invalid option for udp_csum\n", *argv);
} else if (strcmp(*argv, "udp6_csum_rx") == 0) {
NEXT_ARG();
if (strcmp(*argv, "on") == 0)
p->udp6_csum_rx = 1;
else if (strcmp(*argv, "off") == 0)
p->udp6_csum_rx = 0;
else
invarg("invalid option for udp6_csum_rx\n"
, *argv);
} else if (strcmp(*argv, "udp6_csum_tx") == 0) {
NEXT_ARG();
if (strcmp(*argv, "on") == 0)
p->udp6_csum_tx = 1;
else if (strcmp(*argv, "off") == 0)
p->udp6_csum_tx = 0;
else
invarg("invalid option for udp6_csum_tx\n"
, *argv);
} else if (strcmp(*argv, "offset") == 0) {
fprintf(stderr, "Ignoring option \"offset\"\n");
NEXT_ARG();
} else if (strcmp(*argv, "peer_offset") == 0) {
fprintf(stderr, "Ignoring option \"peer_offset\"\n");
NEXT_ARG();
} 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, "l2spec_type") == 0) {
NEXT_ARG();
if (strcasecmp(*argv, "default") == 0) {
p->l2spec_type = L2TP_L2SPECTYPE_DEFAULT;
p->l2spec_len = 4;
} else if (strcasecmp(*argv, "none") == 0) {
p->l2spec_type = L2TP_L2SPECTYPE_NONE;
p->l2spec_len = 0;
} else {
fprintf(stderr,
"Unknown layer2specific header type \"%s\"\n",
*argv);
exit(-1);
}
} else if (strcmp(*argv, "seq") == 0) {
NEXT_ARG();
if (strcasecmp(*argv, "both") == 0) {
p->recv_seq = 1;
p->send_seq = 1;
} else if (strcasecmp(*argv, "recv") == 0) {
p->recv_seq = 1;
} else if (strcasecmp(*argv, "send") == 0) {
p->send_seq = 1;
} else if (strcasecmp(*argv, "none") == 0) {
p->recv_seq = 0;
p->send_seq = 0;
} else {
fprintf(stderr,
"Unknown seq value \"%s\"\n", *argv);
exit(-1);
}
} 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.family == AF_UNSPEC)
missarg("local");
if (p.peer_ip.family == AF_UNSPEC)
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;
}
int do_ipl2tp(int argc, char **argv)
{
if (argc < 1 || !matches(*argv, "help"))
usage();
if (genl_init_handle(&genl_rth, L2TP_GENL_NAME, &genl_family))
exit(1);
if (matches(*argv, "add") == 0)
return do_add(argc-1, argv+1);
if (matches(*argv, "delete") == 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);
fprintf(stderr,
"Command \"%s\" is unknown, try \"ip l2tp help\".\n", *argv);
exit(-1);
}