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/* GTP specific Generic Netlink helper functions */
/* (C) 2014 by sysmocom - s.f.m.c. GmbH
* Author: Pablo Neira Ayuso <pablo@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <inttypes.h>
#include <libmnl/libmnl.h>
#include <linux/genetlink.h>
#include <libgtpnl/gtp.h>
#include <libgtpnl/gtpnl.h>
#include <net/if.h>
#include <linux/gtp.h>
#include <linux/if_link.h>
#include "internal.h"
static void gtp_build_payload(struct nlmsghdr *nlh, struct gtp_tunnel *t)
{
if (t->flags & GTP_TUN_FAMILY)
mnl_attr_put_u8(nlh, GTPA_FAMILY, t->ms_addr.family);
if (t->flags & GTP_TUN_VERSION)
mnl_attr_put_u32(nlh, GTPA_VERSION, t->gtp_version);
if (t->flags & GTP_TUN_IFNS)
mnl_attr_put_u32(nlh, GTPA_NET_NS_FD, t->ifns);
if (t->flags & GTP_TUN_IFIDX)
mnl_attr_put_u32(nlh, GTPA_LINK, t->ifidx);
if (t->flags & GTP_TUN_MS_ADDR) {
switch (t->ms_addr.family) {
case AF_INET:
mnl_attr_put_u32(nlh, GTPA_MS_ADDRESS, t->ms_addr.ip4.s_addr);
break;
case AF_INET6:
mnl_attr_put(nlh, GTPA_MS_ADDR6, sizeof(t->ms_addr.ip6), &t->ms_addr.ip6);
break;
default:
/* No addr is set when deleting a tunnel */
break;
}
}
if (t->flags & GTP_TUN_SGSN_ADDR) {
switch (t->sgsn_addr.family) {
case AF_INET:
mnl_attr_put_u32(nlh, GTPA_PEER_ADDRESS, t->sgsn_addr.ip4.s_addr);
break;
case AF_INET6:
mnl_attr_put(nlh, GTPA_PEER_ADDR6, sizeof(t->sgsn_addr.ip6), &t->sgsn_addr.ip6);
break;
default:
/* No addr is set when deleting a tunnel */
break;
}
}
if (t->flags & GTP_TUN_VERSION) {
if (t->gtp_version == GTP_V0) {
if (t->flags & GTP_TUN_V0_TID)
mnl_attr_put_u64(nlh, GTPA_TID, t->u.v0.tid);
if (t->flags & GTP_TUN_V0_FLOWID)
mnl_attr_put_u16(nlh, GTPA_FLOW, t->u.v0.flowid);
} else if (t->gtp_version == GTP_V1) {
if (t->flags & GTP_TUN_V1_I_TEI)
mnl_attr_put_u32(nlh, GTPA_I_TEI, t->u.v1.i_tei);
if (t->flags & GTP_TUN_V1_O_TEI)
mnl_attr_put_u32(nlh, GTPA_O_TEI, t->u.v1.o_tei);
}
}
}
int gtp_add_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t)
{
struct nlmsghdr *nlh;
char buf[MNL_SOCKET_BUFFER_SIZE];
uint32_t seq = time(NULL);
if (t->gtp_version > GTP_V1) {
fprintf(stderr, "wrong GTP version %u, use v0 or v1\n",
t->gtp_version);
return -1;
}
nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_EXCL | NLM_F_ACK, ++seq,
GTP_CMD_NEWPDP);
gtp_build_payload(nlh, t);
if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0) {
perror("genl_socket_talk");
return -1;
}
return 0;
}
EXPORT_SYMBOL(gtp_add_tunnel);
int gtp_del_tunnel(int genl_id, struct mnl_socket *nl, struct gtp_tunnel *t)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t seq = time(NULL);
nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_ACK, ++seq,
GTP_CMD_DELPDP);
gtp_build_payload(nlh, t);
if (genl_socket_talk(nl, nlh, seq, NULL, NULL) < 0) {
perror("genl_socket_talk");
return -1;
}
return 0;
}
EXPORT_SYMBOL(gtp_del_tunnel);
struct gtp_pdp {
uint32_t ifidx;
uint32_t version;
union {
struct {
uint64_t tid;
} v0;
struct {
uint32_t i_tei;
uint32_t o_tei;
} v1;
} u;
struct gtp_addr sgsn_addr;
struct gtp_addr ms_addr;
};
static int genl_gtp_validate_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, GTPA_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case GTPA_FAMILY:
if (mnl_attr_validate(attr, MNL_TYPE_U8) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
case GTPA_TID:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
case GTPA_O_TEI:
case GTPA_I_TEI:
case GTPA_PEER_ADDRESS:
case GTPA_MS_ADDRESS:
case GTPA_VERSION:
case GTPA_LINK:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
case GTPA_PEER_ADDR6:
case GTPA_MS_ADDR6:
if (mnl_attr_validate2(attr, MNL_TYPE_BINARY,
sizeof(struct in6_addr)) < 0) {
perror("mnl_attr_validate");
return MNL_CB_ERROR;
}
break;
default:
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static int genl_gtp_attr_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[GTPA_MAX + 1] = {};
char buf[INET6_ADDRSTRLEN];
struct gtp_pdp pdp = {};
struct genlmsghdr *genl;
mnl_attr_parse(nlh, sizeof(*genl), genl_gtp_validate_cb, tb);
if (tb[GTPA_LINK])
pdp.ifidx = mnl_attr_get_u32(tb[GTPA_LINK]);
if (tb[GTPA_TID])
pdp.u.v0.tid = mnl_attr_get_u64(tb[GTPA_TID]);
if (tb[GTPA_I_TEI])
pdp.u.v1.i_tei = mnl_attr_get_u32(tb[GTPA_I_TEI]);
if (tb[GTPA_O_TEI])
pdp.u.v1.o_tei = mnl_attr_get_u32(tb[GTPA_O_TEI]);
if (tb[GTPA_PEER_ADDRESS]) {
pdp.sgsn_addr.family = AF_INET;
pdp.sgsn_addr.ip4.s_addr = mnl_attr_get_u32(tb[GTPA_PEER_ADDRESS]);
} else if (tb[GTPA_PEER_ADDR6]) {
pdp.sgsn_addr.family = AF_INET6;
memcpy(&pdp.sgsn_addr.ip6, mnl_attr_get_payload(tb[GTPA_PEER_ADDR6]),
sizeof(struct in6_addr));
} else {
fprintf(stderr, "sgsn_addr: no IPv4 nor IPv6 set\n");
return MNL_CB_ERROR;
}
if (tb[GTPA_MS_ADDRESS]) {
pdp.ms_addr.family = AF_INET;
pdp.ms_addr.ip4.s_addr = mnl_attr_get_u32(tb[GTPA_MS_ADDRESS]);
} else if (tb[GTPA_MS_ADDR6]) {
pdp.ms_addr.family = AF_INET6;
memcpy(&pdp.ms_addr.ip6, mnl_attr_get_payload(tb[GTPA_MS_ADDR6]), sizeof(struct in6_addr));
} else {
fprintf(stderr, "ms_addr: no IPv4 nor IPv6 set\n");
return MNL_CB_ERROR;
}
if (tb[GTPA_FAMILY] && mnl_attr_get_u32(tb[GTPA_FAMILY]) != pdp.ms_addr.family) {
fprintf(stderr, "ms_addr family does not match GTPA_FAMILY\n");
return MNL_CB_ERROR;
}
printf("%s ", if_indextoname(pdp.ifidx, buf));
if (tb[GTPA_VERSION])
pdp.version = mnl_attr_get_u32(tb[GTPA_VERSION]);
printf("version %u ", pdp.version);
if (pdp.version == GTP_V0)
printf("tid %"PRIu64" ", pdp.u.v0.tid);
else if (pdp.version == GTP_V1)
printf("tei %u/%u ", pdp.u.v1.i_tei, pdp.u.v1.o_tei);
inet_ntop(pdp.ms_addr.family, &pdp.ms_addr.ip4, buf, sizeof(buf));
printf("ms_addr %s ", buf);
inet_ntop(pdp.sgsn_addr.family, &pdp.sgsn_addr.ip4, buf, sizeof(buf));
printf("sgsn_addr %s\n", buf);
return MNL_CB_OK;
}
int gtp_list_tunnel(int genl_id, struct mnl_socket *nl)
{
char buf[MNL_SOCKET_BUFFER_SIZE];
struct nlmsghdr *nlh;
uint32_t seq = time(NULL);
nlh = genl_nlmsg_build_hdr(buf, genl_id, NLM_F_DUMP, 0,
GTP_CMD_GETPDP);
if (genl_socket_talk(nl, nlh, seq, genl_gtp_attr_cb, NULL) < 0) {
perror("genl_socket_talk");
return -1;
}
return 0;
}
EXPORT_SYMBOL(gtp_list_tunnel);
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