| /* Command line utility to create GTP link */ |
| |
| /* (C) 2014 by sysmocom - s.f.m.c. GmbH |
| * (C) 2016 by Pablo Neira Ayuso <pablo@netfilter.org> |
| * |
| * 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 General Public License as published by |
| * the Free Software Foundation; either version 2 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 Affero General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <time.h> |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| #include <libmnl/libmnl.h> |
| #include <linux/if.h> |
| #include <linux/if_link.h> |
| #include <linux/rtnetlink.h> |
| |
| #include <linux/gtp.h> |
| #include <linux/if_link.h> |
| |
| #include <libgtpnl/gtpnl.h> |
| |
| int main(int argc, char *argv[]) |
| { |
| struct mnl_socket *nl; |
| char buf[MNL_SOCKET_BUFFER_SIZE]; |
| struct nlmsghdr *nlh; |
| struct ifinfomsg *ifm; |
| int ret; |
| unsigned int seq, portid; |
| struct nlattr *nest, *nest2; |
| |
| if (argc != 3) { |
| printf("Usage: %s <add|del> <device>\n", argv[0]); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (!strcmp(argv[1], "del")) { |
| printf("destroying gtp interface...\n"); |
| if (gtp_dev_destroy(argv[2]) < 0) |
| perror("gtp_dev_destroy"); |
| |
| return 0; |
| } |
| |
| nlh = mnl_nlmsg_put_header(buf); |
| nlh->nlmsg_type = RTM_NEWLINK; |
| nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL |NLM_F_ACK; |
| nlh->nlmsg_seq = seq = time(NULL); |
| ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm)); |
| ifm->ifi_family = AF_INET; |
| ifm->ifi_change |= IFF_UP; |
| ifm->ifi_flags |= IFF_UP; |
| |
| int fd1 = socket(AF_INET, SOCK_DGRAM, 0); |
| int fd2 = socket(AF_INET, SOCK_DGRAM, 0); |
| struct sockaddr_in sockaddr_fd1 = { |
| .sin_family = AF_INET, |
| .sin_port = htons(3386), |
| .sin_addr = { |
| .s_addr = INADDR_ANY, |
| }, |
| }; |
| struct sockaddr_in sockaddr_fd2 = { |
| .sin_family = AF_INET, |
| .sin_port = htons(2152), |
| .sin_addr = { |
| .s_addr = INADDR_ANY, |
| }, |
| }; |
| |
| if (bind(fd1, (struct sockaddr *) &sockaddr_fd1, |
| sizeof(sockaddr_fd1)) < 0) { |
| perror("bind"); |
| exit(EXIT_FAILURE); |
| } |
| if (bind(fd2, (struct sockaddr *) &sockaddr_fd2, |
| sizeof(sockaddr_fd2)) < 0) { |
| perror("bind"); |
| exit(EXIT_FAILURE); |
| } |
| |
| mnl_attr_put_str(nlh, IFLA_IFNAME, argv[2]); |
| nest = mnl_attr_nest_start(nlh, IFLA_LINKINFO); |
| mnl_attr_put_str(nlh, IFLA_INFO_KIND, "gtp"); |
| nest2 = mnl_attr_nest_start(nlh, IFLA_INFO_DATA); |
| mnl_attr_put_u32(nlh, IFLA_GTP_FD0, fd1); |
| mnl_attr_put_u32(nlh, IFLA_GTP_FD1, fd2); |
| mnl_attr_put_u32(nlh, IFLA_GTP_PDP_HASHSIZE, 131072); |
| mnl_attr_nest_end(nlh, nest2); |
| mnl_attr_nest_end(nlh, nest); |
| |
| nl = mnl_socket_open(NETLINK_ROUTE); |
| if (nl == NULL) { |
| perror("mnl_socket_open"); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { |
| perror("mnl_socket_bind"); |
| exit(EXIT_FAILURE); |
| } |
| portid = mnl_socket_get_portid(nl); |
| |
| mnl_nlmsg_fprintf(stdout, nlh, nlh->nlmsg_len, |
| sizeof(struct ifinfomsg)); |
| |
| if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { |
| perror("mnl_socket_send"); |
| exit(EXIT_FAILURE); |
| } |
| |
| ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); |
| if (ret == -1) { |
| perror("read"); |
| exit(EXIT_FAILURE); |
| } |
| |
| ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL); |
| if (ret == -1){ |
| perror("callback"); |
| exit(EXIT_FAILURE); |
| } |
| |
| mnl_socket_close(nl); |
| |
| fprintf(stderr, "WARNING: attaching dummy socket descriptors. Keep " |
| "this process running for testing purposes.\n"); |
| |
| while (1) { |
| struct sockaddr_in addr; |
| socklen_t len = sizeof(addr); |
| |
| ret = recvfrom(fd1, buf, sizeof(buf), 0, |
| (struct sockaddr *)&addr, &len); |
| printf("received %d bytes via UDP socket\n", ret); |
| } |
| |
| return 0; |
| } |