/* *------------------------------------------------------------------ * Copyright (c) 2017 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *------------------------------------------------------------------ */ #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <net/if.h> #include <linux/netlink.h> #include <linux/rtnetlink.h> #include <vlib/vlib.h> #include <vlib/unix/unix.h> #include <vnet/devices/netlink.h> typedef struct { u8 *data; } vnet_netlink_msg_t; static void vnet_netlink_msg_init (vnet_netlink_msg_t * m, u16 type, u16 flags, void *msg_data, int msg_len) { struct nlmsghdr *nh; u8 *p; clib_memset (m, 0, sizeof (vnet_netlink_msg_t)); vec_add2 (m->data, p, NLMSG_SPACE (msg_len)); ASSERT (m->data == p); nh = (struct nlmsghdr *) p; nh->nlmsg_flags = flags | NLM_F_ACK; nh->nlmsg_type = type; clib_memcpy (m->data + sizeof (struct nlmsghdr), msg_data, msg_len); } static void vnet_netlink_msg_add_rtattr (vnet_netlink_msg_t * m, u16 rta_type, void *rta_data, int rta_data_len) { struct rtattr *rta; u8 *p; vec_add2 (m->data, p, RTA_SPACE (rta_data_len)); rta = (struct rtattr *) p; rta->rta_type = rta_type; rta->rta_len = RTA_LENGTH (rta_data_len); clib_memcpy (RTA_DATA (rta), rta_data, rta_data_len); } static clib_error_t * vnet_netlink_msg_send (vnet_netlink_msg_t * m) { clib_error_t *err = 0; struct sockaddr_nl ra = { 0 }; int len, sock; struct nlmsghdr *nh = (struct nlmsghdr *) m->data; nh->nlmsg_len = vec_len (m->data); char buf[4096]; if ((sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) == -1) return clib_error_return_unix (0, "socket(AF_NETLINK)"); ra.nl_family = AF_NETLINK; ra.nl_pid = 0; if ((bind (sock, (struct sockaddr *) &ra, sizeof (ra))) == -1) { err = clib_error_return_unix (0, "bind"); goto done; } if ((send (sock, m->data, vec_len (m->data), 0)) == -1) err = clib_error_return_unix (0, "send"); if ((len = recv (sock, buf, sizeof (buf), 0)) == -1) err = clib_error_return_unix (0, "recv"); for (nh = (struct nlmsghdr *) buf; NLMSG_OK (nh, len); nh = NLMSG_NEXT (nh, len)) { if (nh->nlmsg_type == NLMSG_DONE) goto done; if (nh->nlmsg_type == NLMSG_ERROR) { struct nlmsgerr *e = (struct nlmsgerr *) NLMSG_DATA (nh); if (e->error) err = clib_error_return (0, "netlink error %d", e->error); goto done; } } done: close (sock); vec_free (m->data); return err; } clib_error_t * vnet_netlink_set_link_name (int ifindex, char *new_ifname) { vnet_netlink_msg_t m; struct ifinfomsg ifmsg = { 0 }; ifmsg.ifi_index = ifindex; vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST, &ifmsg, sizeof (struct ifinfomsg)); vnet_netlink_msg_add_rtattr (&m, IFLA_IFNAME, new_ifname, strlen (new_ifname) + 1); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_set_link_netns (int ifindex, int netns_fd, char *new_ifname) { vnet_netlink_msg_t m; struct ifinfomsg ifmsg = { 0 }; ifmsg.ifi_index = ifindex; vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST, &ifmsg, sizeof (struct ifinfomsg)); vnet_netlink_msg_add_rtattr (&m, IFLA_NET_NS_FD, &netns_fd, sizeof (int)); if (new_ifname) vnet_netlink_msg_add_rtattr (&m, IFLA_IFNAME, new_ifname, strlen (new_ifname) + 1); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_set_link_master (int ifindex, char *master_ifname) { vnet_netlink_msg_t m; struct ifinfomsg ifmsg = { 0 }; int i; ifmsg.ifi_index = ifindex; if ((i = if_nametoindex (master_ifname)) == 0) clib_error_return_unix (0, "unknown master interface '%s'", master_ifname); vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST, &ifmsg, sizeof (struct ifinfomsg)); vnet_netlink_msg_add_rtattr (&m, IFLA_MASTER, &i, sizeof (int)); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_set_link_addr (int ifindex, u8 * mac) { vnet_netlink_msg_t m; struct ifinfomsg ifmsg = { 0 }; ifmsg.ifi_index = ifindex; vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST, &ifmsg, sizeof (struct ifinfomsg)); vnet_netlink_msg_add_rtattr (&m, IFLA_ADDRESS, mac, 6); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_set_link_state (int ifindex, int up) { vnet_netlink_msg_t m; struct ifinfomsg ifmsg = { 0 }; ifmsg.ifi_flags = IFF_UP; ifmsg.ifi_change = IFF_UP; ifmsg.ifi_index = ifindex; vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST, &ifmsg, sizeof (struct ifinfomsg)); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_set_link_mtu (int ifindex, int mtu) { vnet_netlink_msg_t m; struct ifinfomsg ifmsg = { 0 }; ifmsg.ifi_index = ifindex; vnet_netlink_msg_init (&m, RTM_SETLINK, NLM_F_REQUEST, &ifmsg, sizeof (struct ifinfomsg)); vnet_netlink_msg_add_rtattr (&m, IFLA_MTU, &mtu, sizeof (int)); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_add_ip4_addr (int ifindex, void *addr, int pfx_len) { vnet_netlink_msg_t m; struct ifaddrmsg ifa = { 0 }; ifa.ifa_family = AF_INET; ifa.ifa_prefixlen = pfx_len; ifa.ifa_index = ifindex; vnet_netlink_msg_init (&m, RTM_NEWADDR, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL, &ifa, sizeof (struct ifaddrmsg)); vnet_netlink_msg_add_rtattr (&m, IFA_LOCAL, addr, 4); vnet_netlink_msg_add_rtattr (&m, IFA_ADDRESS, addr, 4); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_add_ip6_addr (int ifindex, void *addr, int pfx_len) { vnet_netlink_msg_t m; struct ifaddrmsg ifa = { 0 }; ifa.ifa_family = AF_INET6; ifa.ifa_prefixlen = pfx_len; ifa.ifa_index = ifindex; vnet_netlink_msg_init (&m, RTM_NEWADDR, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL, &ifa, sizeof (struct ifaddrmsg)); vnet_netlink_msg_add_rtattr (&m, IFA_LOCAL, addr, 16); vnet_netlink_msg_add_rtattr (&m, IFA_ADDRESS, addr, 16); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_add_ip4_route (void *dst, u8 dst_len, void *gw) { vnet_netlink_msg_t m; struct rtmsg rtm = { 0 }; u8 dflt[4] = { 0 }; rtm.rtm_family = AF_INET; rtm.rtm_table = RT_TABLE_MAIN; rtm.rtm_type = RTN_UNICAST; rtm.rtm_dst_len = dst_len; vnet_netlink_msg_init (&m, RTM_NEWROUTE, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL, &rtm, sizeof (struct rtmsg)); vnet_netlink_msg_add_rtattr (&m, RTA_GATEWAY, gw, 4); vnet_netlink_msg_add_rtattr (&m, RTA_DST, dst ? dst : dflt, 4); return vnet_netlink_msg_send (&m); } clib_error_t * vnet_netlink_add_ip6_route (void *dst, u8 dst_len, void *gw) { vnet_netlink_msg_t m; struct rtmsg rtm = { 0 }; u8 dflt[16] = { 0 }; rtm.rtm_family = AF_INET6; rtm.rtm_table = RT_TABLE_MAIN; rtm.rtm_type = RTN_UNICAST; rtm.rtm_dst_len = dst_len; vnet_netlink_msg_init (&m, RTM_NEWROUTE, NLM_F_REQUEST | NLM_F_CREATE | NLM_F_EXCL, &rtm, sizeof (struct rtmsg)); vnet_netlink_msg_add_rtattr (&m, RTA_GATEWAY, gw, 16); vnet_netlink_msg_add_rtattr (&m, RTA_DST, dst ? dst : dflt, 16); return vnet_netlink_msg_send (&m); } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */