l2tp: Add l2tp support
Based on earlier implementation by James Chapman. But instead of
dragging in all of libnl, use existing libnetlink infrastructure.
diff --git a/ip/ipl2tp.c b/ip/ipl2tp.c
new file mode 100644
index 0000000..042ddb4
--- /dev/null
+++ b/ip/ipl2tp.c
@@ -0,0 +1,813 @@
+/*
+ * 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 <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/family.h>
+#include <netlink/genl/mngt.h>
+#include <netlink/genl/ctrl.h>
+#include <netlink/utils.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\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, "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);
+}