| #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_nl.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); |
| mnl_attr_put_u32(nlh, GTPA_LINK, t->ifidx); |
| mnl_attr_put_u32(nlh, GTPA_SGSN_ADDRESS, t->sgsn_addr.s_addr); |
| mnl_attr_put_u32(nlh, GTPA_MS_ADDRESS, t->ms_addr.s_addr); |
| mnl_attr_put_u64(nlh, GTPA_TID, t->tid); |
| mnl_attr_put_u16(nlh, GTPA_FLOWID, t->flowid); |
| } |
| |
| 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_TUNNEL_NEW); |
| 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_TUNNEL_DELETE); |
| 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; |
| uint64_t tid; |
| 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, CTRL_ATTR_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_SGSN_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] = {}; |
| struct gtp_pdp pdp = {}; |
| struct genlmsghdr *genl; |
| |
| mnl_attr_parse(nlh, sizeof(*genl), genl_gtp_validate_cb, tb); |
| if (tb[GTPA_TID]) |
| pdp.tid = mnl_attr_get_u64(tb[GTPA_TID]); |
| if (tb[GTPA_SGSN_ADDRESS]) { |
| pdp.sgsn_addr.s_addr = |
| mnl_attr_get_u32(tb[GTPA_SGSN_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); |
| printf("tid %"PRIu64" ms_addr %s ", pdp.tid, inet_ntoa(pdp.sgsn_addr)); |
| printf("sgsn_addr %s\n", inet_ntoa(pdp.ms_addr)); |
| |
| 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_TUNNEL_GET); |
| |
| 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); |