| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <time.h> |
| |
| #include <libmnl/libmnl.h> |
| #include <net/if.h> |
| #include <linux/if_link.h> |
| #include <linux/rtnetlink.h> |
| |
| #include <libgtpnl/gtpnl.h> |
| |
| #include <linux/gtp_nl.h> |
| |
| #include "internal.h" |
| |
| static struct nlmsghdr * |
| gtp_put_nlmsg(char *buf, uint16_t type, uint16_t nl_flags, uint32_t seq) |
| { |
| struct nlmsghdr *nlh; |
| |
| nlh = mnl_nlmsg_put_header(buf); |
| nlh->nlmsg_type = type; |
| nlh->nlmsg_flags = NLM_F_REQUEST | nl_flags; |
| nlh->nlmsg_seq = seq; |
| |
| return nlh; |
| } |
| |
| static int gtp_dev_talk(struct nlmsghdr *nlh, uint32_t seq) |
| { |
| struct mnl_socket *nl; |
| char buf[MNL_SOCKET_BUFFER_SIZE]; |
| int ret; |
| |
| nl = mnl_socket_open(NETLINK_ROUTE); |
| if (nl == NULL) { |
| perror("mnl_socket_open"); |
| return -1; |
| } |
| |
| if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0) { |
| perror("mnl_socket_bind"); |
| goto err; |
| } |
| |
| if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0) { |
| perror("mnl_socket_send"); |
| goto err; |
| } |
| |
| ret = mnl_socket_recvfrom(nl, buf, sizeof(buf)); |
| if (ret == -1) { |
| perror("read"); |
| goto err; |
| } |
| |
| ret = mnl_cb_run(buf, ret, seq, mnl_socket_get_portid(nl), NULL, NULL); |
| if (ret == -1){ |
| perror("callback"); |
| goto err; |
| } |
| |
| mnl_socket_close(nl); |
| return 0; |
| err: |
| mnl_socket_close(nl); |
| return -1; |
| } |
| |
| int gtp_dev_create(const char *gtp_ifname, const char *real_ifname, |
| int fd0, int fd1) |
| { |
| char buf[MNL_SOCKET_BUFFER_SIZE]; |
| struct nlmsghdr *nlh; |
| struct ifinfomsg *ifm; |
| unsigned int seq = time(NULL); |
| struct nlattr *nest, *nest2; |
| |
| nlh = gtp_put_nlmsg(buf, RTM_NEWLINK, |
| NLM_F_CREATE | NLM_F_EXCL | NLM_F_ACK, seq); |
| ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm)); |
| ifm->ifi_family = AF_INET; |
| ifm->ifi_change |= IFF_UP; |
| ifm->ifi_flags |= IFF_UP; |
| |
| mnl_attr_put_u32(nlh, IFLA_LINK, if_nametoindex(real_ifname)); |
| mnl_attr_put_str(nlh, IFLA_IFNAME, gtp_ifname); |
| 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, fd0); |
| mnl_attr_put_u32(nlh, IFLA_GTP_FD1, fd1); |
| mnl_attr_put_u32(nlh, IFLA_GTP_HASHSIZE, 131072); |
| mnl_attr_nest_end(nlh, nest2); |
| mnl_attr_nest_end(nlh, nest); |
| |
| return gtp_dev_talk(nlh, seq); |
| } |
| EXPORT_SYMBOL(gtp_dev_create); |
| |
| int gtp_dev_destroy(const char *gtp_ifname) |
| { |
| char buf[MNL_SOCKET_BUFFER_SIZE]; |
| struct nlmsghdr *nlh; |
| struct ifinfomsg *ifm; |
| unsigned int seq = time(NULL); |
| |
| nlh = gtp_put_nlmsg(buf, RTM_DELLINK, NLM_F_ACK, seq); |
| ifm = mnl_nlmsg_put_extra_header(nlh, sizeof(*ifm)); |
| ifm->ifi_family = AF_INET; |
| ifm->ifi_change |= IFF_UP; |
| ifm->ifi_flags &= ~IFF_UP; |
| ifm->ifi_index = if_nametoindex(gtp_ifname); |
| |
| return gtp_dev_talk(nlh, seq); |
| } |
| EXPORT_SYMBOL(gtp_dev_destroy); |