| /* 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) |
| { |
| mnl_attr_put_u32(nlh, GTPA_VERSION, t->gtp_version); |
| if (t->ifns >= 0) |
| mnl_attr_put_u32(nlh, GTPA_NET_NS_FD, t->ifns); |
| mnl_attr_put_u32(nlh, GTPA_LINK, t->ifidx); |
| mnl_attr_put_u32(nlh, GTPA_PEER_ADDRESS, t->sgsn_addr.s_addr); |
| mnl_attr_put_u32(nlh, GTPA_MS_ADDRESS, t->ms_addr.s_addr); |
| if (t->gtp_version == GTP_V0) { |
| mnl_attr_put_u64(nlh, GTPA_TID, t->u.v0.tid); |
| mnl_attr_put_u16(nlh, GTPA_FLOW, t->u.v0.flowid); |
| } else if (t->gtp_version == GTP_V1) { |
| mnl_attr_put_u32(nlh, GTPA_I_TEI, t->u.v1.i_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 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 0; |
| } |
| EXPORT_SYMBOL(gtp_del_tunnel); |
| |
| struct gtp_pdp { |
| uint32_t version; |
| union { |
| struct { |
| uint64_t tid; |
| } v0; |
| struct { |
| uint32_t i_tei; |
| uint32_t o_tei; |
| } v1; |
| } u; |
| struct in_addr sgsn_addr; |
| struct in_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_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: |
| if (mnl_attr_validate(attr, MNL_TYPE_U32) < 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[INET_ADDRSTRLEN]; |
| struct gtp_pdp pdp = {}; |
| struct genlmsghdr *genl; |
| |
| mnl_attr_parse(nlh, sizeof(*genl), genl_gtp_validate_cb, tb); |
| 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.s_addr = |
| mnl_attr_get_u32(tb[GTPA_PEER_ADDRESS]); |
| } |
| if (tb[GTPA_MS_ADDRESS]) { |
| pdp.ms_addr.s_addr = mnl_attr_get_u32(tb[GTPA_MS_ADDRESS]); |
| } |
| if (tb[GTPA_VERSION]) { |
| pdp.version = mnl_attr_get_u32(tb[GTPA_VERSION]); |
| } |
| |
| printf("version %u ", pdp.version); |
| if (pdp.version == GTP_V0) { |
| inet_ntop(AF_INET, &pdp.ms_addr, buf, sizeof(buf)); |
| printf("tid %"PRIu64" ms_addr %s ", |
| pdp.u.v0.tid, buf); |
| } else if (pdp.version == GTP_V1) { |
| inet_ntop(AF_INET, &pdp.ms_addr, buf, sizeof(buf)); |
| printf("tei %u/%u ms_addr %s ", pdp.u.v1.i_tei, |
| pdp.u.v1.o_tei, buf); |
| } |
| inet_ntop(AF_INET, &pdp.sgsn_addr, 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 0; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(gtp_list_tunnel); |