| /* Kernel routing table updates using netlink over GNU/Linux system. |
| * Copyright (C) 1997, 98, 99 Kunihiro Ishiguro |
| * |
| * This file is part of GNU Zebra. |
| * |
| * GNU Zebra 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, or (at your option) any |
| * later version. |
| * |
| * GNU Zebra 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 |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU Zebra; see the file COPYING. If not, write to the Free |
| * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| * 02111-1307, USA. |
| */ |
| |
| #include <zebra.h> |
| |
| /* Hack for GNU libc version 2. */ |
| #ifndef MSG_TRUNC |
| #define MSG_TRUNC 0x20 |
| #endif /* MSG_TRUNC */ |
| |
| #include "linklist.h" |
| #include "if.h" |
| #include "log.h" |
| #include "prefix.h" |
| #include "connected.h" |
| #include "table.h" |
| #include "rib.h" |
| #include "thread.h" |
| #include "privs.h" |
| |
| #include "zebra/zserv.h" |
| #include "zebra/rt.h" |
| #include "zebra/redistribute.h" |
| #include "zebra/interface.h" |
| #include "zebra/debug.h" |
| |
| /* Socket interface to kernel */ |
| struct nlsock |
| { |
| int sock; |
| int seq; |
| struct sockaddr_nl snl; |
| const char *name; |
| } netlink = { -1, 0, {0}, "netlink-listen"}, /* kernel messages */ |
| netlink_cmd = { -1, 0, {0}, "netlink-cmd"}; /* command channel */ |
| |
| static const struct message nlmsg_str[] = { |
| {RTM_NEWROUTE, "RTM_NEWROUTE"}, |
| {RTM_DELROUTE, "RTM_DELROUTE"}, |
| {RTM_GETROUTE, "RTM_GETROUTE"}, |
| {RTM_NEWLINK, "RTM_NEWLINK"}, |
| {RTM_DELLINK, "RTM_DELLINK"}, |
| {RTM_GETLINK, "RTM_GETLINK"}, |
| {RTM_NEWADDR, "RTM_NEWADDR"}, |
| {RTM_DELADDR, "RTM_DELADDR"}, |
| {RTM_GETADDR, "RTM_GETADDR"}, |
| {0, NULL} |
| }; |
| |
| static const char *nexthop_types_desc[] = |
| { |
| "none", |
| "Directly connected", |
| "Interface route", |
| "IPv4 nexthop", |
| "IPv4 nexthop with ifindex", |
| "IPv4 nexthop with ifname", |
| "IPv6 nexthop", |
| "IPv6 nexthop with ifindex", |
| "IPv6 nexthop with ifname", |
| "Null0 nexthop", |
| }; |
| |
| extern struct zebra_t zebrad; |
| |
| extern struct zebra_privs_t zserv_privs; |
| |
| extern u_int32_t nl_rcvbufsize; |
| |
| /* Note: on netlink systems, there should be a 1-to-1 mapping between interface |
| names and ifindex values. */ |
| static void |
| set_ifindex(struct interface *ifp, unsigned int ifi_index) |
| { |
| struct interface *oifp; |
| |
| if (((oifp = if_lookup_by_index(ifi_index)) != NULL) && (oifp != ifp)) |
| { |
| if (ifi_index == IFINDEX_INTERNAL) |
| zlog_err("Netlink is setting interface %s ifindex to reserved " |
| "internal value %u", ifp->name, ifi_index); |
| else |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("interface index %d was renamed from %s to %s", |
| ifi_index, oifp->name, ifp->name); |
| if (if_is_up(oifp)) |
| zlog_err("interface rename detected on up interface: index %d " |
| "was renamed from %s to %s, results are uncertain!", |
| ifi_index, oifp->name, ifp->name); |
| if_delete_update(oifp); |
| } |
| } |
| ifp->ifindex = ifi_index; |
| } |
| |
| static int |
| netlink_recvbuf (struct nlsock *nl, uint32_t newsize) |
| { |
| u_int32_t oldsize; |
| socklen_t newlen = sizeof(newsize); |
| socklen_t oldlen = sizeof(oldsize); |
| int ret; |
| |
| ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &oldsize, &oldlen); |
| if (ret < 0) |
| { |
| zlog (NULL, LOG_ERR, "Can't get %s receive buffer size: %s", nl->name, |
| safe_strerror (errno)); |
| return -1; |
| } |
| |
| ret = setsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &nl_rcvbufsize, |
| sizeof(nl_rcvbufsize)); |
| if (ret < 0) |
| { |
| zlog (NULL, LOG_ERR, "Can't set %s receive buffer size: %s", nl->name, |
| safe_strerror (errno)); |
| return -1; |
| } |
| |
| ret = getsockopt(nl->sock, SOL_SOCKET, SO_RCVBUF, &newsize, &newlen); |
| if (ret < 0) |
| { |
| zlog (NULL, LOG_ERR, "Can't get %s receive buffer size: %s", nl->name, |
| safe_strerror (errno)); |
| return -1; |
| } |
| |
| zlog (NULL, LOG_INFO, |
| "Setting netlink socket receive buffer size: %u -> %u", |
| oldsize, newsize); |
| return 0; |
| } |
| |
| /* Make socket for Linux netlink interface. */ |
| static int |
| netlink_socket (struct nlsock *nl, unsigned long groups) |
| { |
| int ret; |
| struct sockaddr_nl snl; |
| int sock; |
| int namelen; |
| int save_errno; |
| |
| sock = socket (AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); |
| if (sock < 0) |
| { |
| zlog (NULL, LOG_ERR, "Can't open %s socket: %s", nl->name, |
| safe_strerror (errno)); |
| return -1; |
| } |
| |
| memset (&snl, 0, sizeof snl); |
| snl.nl_family = AF_NETLINK; |
| snl.nl_groups = groups; |
| |
| /* Bind the socket to the netlink structure for anything. */ |
| if (zserv_privs.change (ZPRIVS_RAISE)) |
| { |
| zlog (NULL, LOG_ERR, "Can't raise privileges"); |
| return -1; |
| } |
| |
| ret = bind (sock, (struct sockaddr *) &snl, sizeof snl); |
| save_errno = errno; |
| if (zserv_privs.change (ZPRIVS_LOWER)) |
| zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| |
| if (ret < 0) |
| { |
| zlog (NULL, LOG_ERR, "Can't bind %s socket to group 0x%x: %s", |
| nl->name, snl.nl_groups, safe_strerror (save_errno)); |
| close (sock); |
| return -1; |
| } |
| |
| /* multiple netlink sockets will have different nl_pid */ |
| namelen = sizeof snl; |
| ret = getsockname (sock, (struct sockaddr *) &snl, (socklen_t *) &namelen); |
| if (ret < 0 || namelen != sizeof snl) |
| { |
| zlog (NULL, LOG_ERR, "Can't get %s socket name: %s", nl->name, |
| safe_strerror (errno)); |
| close (sock); |
| return -1; |
| } |
| |
| nl->snl = snl; |
| nl->sock = sock; |
| return ret; |
| } |
| |
| /* Get type specified information from netlink. */ |
| static int |
| netlink_request (int family, int type, struct nlsock *nl) |
| { |
| int ret; |
| struct sockaddr_nl snl; |
| int save_errno; |
| |
| struct |
| { |
| struct nlmsghdr nlh; |
| struct rtgenmsg g; |
| } req; |
| |
| |
| /* Check netlink socket. */ |
| if (nl->sock < 0) |
| { |
| zlog (NULL, LOG_ERR, "%s socket isn't active.", nl->name); |
| return -1; |
| } |
| |
| memset (&snl, 0, sizeof snl); |
| snl.nl_family = AF_NETLINK; |
| |
| memset (&req, 0, sizeof req); |
| req.nlh.nlmsg_len = sizeof req; |
| req.nlh.nlmsg_type = type; |
| req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST; |
| req.nlh.nlmsg_pid = nl->snl.nl_pid; |
| req.nlh.nlmsg_seq = ++nl->seq; |
| req.g.rtgen_family = family; |
| |
| /* linux appears to check capabilities on every message |
| * have to raise caps for every message sent |
| */ |
| if (zserv_privs.change (ZPRIVS_RAISE)) |
| { |
| zlog (NULL, LOG_ERR, "Can't raise privileges"); |
| return -1; |
| } |
| |
| ret = sendto (nl->sock, (void *) &req, sizeof req, 0, |
| (struct sockaddr *) &snl, sizeof snl); |
| save_errno = errno; |
| |
| if (zserv_privs.change (ZPRIVS_LOWER)) |
| zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| |
| if (ret < 0) |
| { |
| zlog (NULL, LOG_ERR, "%s sendto failed: %s", nl->name, |
| safe_strerror (save_errno)); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| /* Receive message from netlink interface and pass those information |
| to the given function. */ |
| static int |
| netlink_parse_info (int (*filter) (struct sockaddr_nl *, struct nlmsghdr *), |
| struct nlsock *nl) |
| { |
| int status; |
| int ret = 0; |
| int error; |
| |
| while (1) |
| { |
| char buf[4096]; |
| struct iovec iov = { buf, sizeof buf }; |
| struct sockaddr_nl snl; |
| struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; |
| struct nlmsghdr *h; |
| |
| status = recvmsg (nl->sock, &msg, 0); |
| if (status < 0) |
| { |
| if (errno == EINTR) |
| continue; |
| if (errno == EWOULDBLOCK || errno == EAGAIN) |
| break; |
| zlog (NULL, LOG_ERR, "%s recvmsg overrun: %s", |
| nl->name, safe_strerror(errno)); |
| continue; |
| } |
| |
| if (status == 0) |
| { |
| zlog (NULL, LOG_ERR, "%s EOF", nl->name); |
| return -1; |
| } |
| |
| if (msg.msg_namelen != sizeof snl) |
| { |
| zlog (NULL, LOG_ERR, "%s sender address length error: length %d", |
| nl->name, msg.msg_namelen); |
| return -1; |
| } |
| |
| for (h = (struct nlmsghdr *) buf; NLMSG_OK (h, (unsigned int) status); |
| h = NLMSG_NEXT (h, status)) |
| { |
| /* Finish of reading. */ |
| if (h->nlmsg_type == NLMSG_DONE) |
| return ret; |
| |
| /* Error handling. */ |
| if (h->nlmsg_type == NLMSG_ERROR) |
| { |
| struct nlmsgerr *err = (struct nlmsgerr *) NLMSG_DATA (h); |
| int errnum = err->error; |
| int msg_type = err->msg.nlmsg_type; |
| |
| /* If the error field is zero, then this is an ACK */ |
| if (err->error == 0) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| { |
| zlog_debug ("%s: %s ACK: type=%s(%u), seq=%u, pid=%u", |
| __FUNCTION__, nl->name, |
| lookup (nlmsg_str, err->msg.nlmsg_type), |
| err->msg.nlmsg_type, err->msg.nlmsg_seq, |
| err->msg.nlmsg_pid); |
| } |
| |
| /* return if not a multipart message, otherwise continue */ |
| if (!(h->nlmsg_flags & NLM_F_MULTI)) |
| { |
| return 0; |
| } |
| continue; |
| } |
| |
| if (h->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr))) |
| { |
| zlog (NULL, LOG_ERR, "%s error: message truncated", |
| nl->name); |
| return -1; |
| } |
| |
| /* Deal with errors that occur because of races in link handling */ |
| if (nl == &netlink_cmd |
| && ((msg_type == RTM_DELROUTE && |
| (-errnum == ENODEV || -errnum == ESRCH)) |
| || (msg_type == RTM_NEWROUTE && -errnum == EEXIST))) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("%s: error: %s type=%s(%u), seq=%u, pid=%u", |
| nl->name, safe_strerror (-errnum), |
| lookup (nlmsg_str, msg_type), |
| msg_type, err->msg.nlmsg_seq, err->msg.nlmsg_pid); |
| return 0; |
| } |
| |
| zlog_err ("%s error: %s, type=%s(%u), seq=%u, pid=%u", |
| nl->name, safe_strerror (-errnum), |
| lookup (nlmsg_str, msg_type), |
| msg_type, err->msg.nlmsg_seq, err->msg.nlmsg_pid); |
| return -1; |
| } |
| |
| /* OK we got netlink message. */ |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("netlink_parse_info: %s type %s(%u), seq=%u, pid=%u", |
| nl->name, |
| lookup (nlmsg_str, h->nlmsg_type), h->nlmsg_type, |
| h->nlmsg_seq, h->nlmsg_pid); |
| |
| /* skip unsolicited messages originating from command socket */ |
| if (nl != &netlink_cmd && h->nlmsg_pid == netlink_cmd.snl.nl_pid) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("netlink_parse_info: %s packet comes from %s", |
| netlink_cmd.name, nl->name); |
| continue; |
| } |
| |
| error = (*filter) (&snl, h); |
| if (error < 0) |
| { |
| zlog (NULL, LOG_ERR, "%s filter function error", nl->name); |
| ret = error; |
| } |
| } |
| |
| /* After error care. */ |
| if (msg.msg_flags & MSG_TRUNC) |
| { |
| zlog (NULL, LOG_ERR, "%s error: message truncated", nl->name); |
| continue; |
| } |
| if (status) |
| { |
| zlog (NULL, LOG_ERR, "%s error: data remnant size %d", nl->name, |
| status); |
| return -1; |
| } |
| } |
| return ret; |
| } |
| |
| /* Utility function for parse rtattr. */ |
| static void |
| netlink_parse_rtattr (struct rtattr **tb, int max, struct rtattr *rta, |
| int len) |
| { |
| while (RTA_OK (rta, len)) |
| { |
| if (rta->rta_type <= max) |
| tb[rta->rta_type] = rta; |
| rta = RTA_NEXT (rta, len); |
| } |
| } |
| |
| /* Called from interface_lookup_netlink(). This function is only used |
| during bootstrap. */ |
| static int |
| netlink_interface (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| { |
| int len; |
| struct ifinfomsg *ifi; |
| struct rtattr *tb[IFLA_MAX + 1]; |
| struct interface *ifp; |
| char *name; |
| int i; |
| |
| ifi = NLMSG_DATA (h); |
| |
| if (h->nlmsg_type != RTM_NEWLINK) |
| return 0; |
| |
| len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); |
| if (len < 0) |
| return -1; |
| |
| /* Looking up interface name. */ |
| memset (tb, 0, sizeof tb); |
| netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); |
| |
| #ifdef IFLA_WIRELESS |
| /* check for wireless messages to ignore */ |
| if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("%s: ignoring IFLA_WIRELESS message", __func__); |
| return 0; |
| } |
| #endif /* IFLA_WIRELESS */ |
| |
| if (tb[IFLA_IFNAME] == NULL) |
| return -1; |
| name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
| |
| /* Add interface. */ |
| ifp = if_get_by_name (name); |
| set_ifindex(ifp, ifi->ifi_index); |
| ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| ifp->mtu6 = ifp->mtu = *(uint32_t *) RTA_DATA (tb[IFLA_MTU]); |
| ifp->metric = 1; |
| |
| /* Hardware type and address. */ |
| ifp->hw_type = ifi->ifi_type; |
| |
| if (tb[IFLA_ADDRESS]) |
| { |
| int hw_addr_len; |
| |
| hw_addr_len = RTA_PAYLOAD (tb[IFLA_ADDRESS]); |
| |
| if (hw_addr_len > INTERFACE_HWADDR_MAX) |
| zlog_warn ("Hardware address is too large: %d", hw_addr_len); |
| else |
| { |
| ifp->hw_addr_len = hw_addr_len; |
| memcpy (ifp->hw_addr, RTA_DATA (tb[IFLA_ADDRESS]), hw_addr_len); |
| |
| for (i = 0; i < hw_addr_len; i++) |
| if (ifp->hw_addr[i] != 0) |
| break; |
| |
| if (i == hw_addr_len) |
| ifp->hw_addr_len = 0; |
| else |
| ifp->hw_addr_len = hw_addr_len; |
| } |
| } |
| |
| if_add_update (ifp); |
| |
| return 0; |
| } |
| |
| /* Lookup interface IPv4/IPv6 address. */ |
| static int |
| netlink_interface_addr (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| { |
| int len; |
| struct ifaddrmsg *ifa; |
| struct rtattr *tb[IFA_MAX + 1]; |
| struct interface *ifp; |
| void *addr; |
| void *broad; |
| u_char flags = 0; |
| char *label = NULL; |
| |
| ifa = NLMSG_DATA (h); |
| |
| if (ifa->ifa_family != AF_INET |
| #ifdef HAVE_IPV6 |
| && ifa->ifa_family != AF_INET6 |
| #endif /* HAVE_IPV6 */ |
| ) |
| return 0; |
| |
| if (h->nlmsg_type != RTM_NEWADDR && h->nlmsg_type != RTM_DELADDR) |
| return 0; |
| |
| len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
| if (len < 0) |
| return -1; |
| |
| memset (tb, 0, sizeof tb); |
| netlink_parse_rtattr (tb, IFA_MAX, IFA_RTA (ifa), len); |
| |
| ifp = if_lookup_by_index (ifa->ifa_index); |
| if (ifp == NULL) |
| { |
| zlog_err ("netlink_interface_addr can't find interface by index %d", |
| ifa->ifa_index); |
| return -1; |
| } |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) /* remove this line to see initial ifcfg */ |
| { |
| char buf[BUFSIZ]; |
| zlog_debug ("netlink_interface_addr %s %s:", |
| lookup (nlmsg_str, h->nlmsg_type), ifp->name); |
| if (tb[IFA_LOCAL]) |
| zlog_debug (" IFA_LOCAL %s/%d", |
| inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_LOCAL]), |
| buf, BUFSIZ), ifa->ifa_prefixlen); |
| if (tb[IFA_ADDRESS]) |
| zlog_debug (" IFA_ADDRESS %s/%d", |
| inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_ADDRESS]), |
| buf, BUFSIZ), ifa->ifa_prefixlen); |
| if (tb[IFA_BROADCAST]) |
| zlog_debug (" IFA_BROADCAST %s/%d", |
| inet_ntop (ifa->ifa_family, RTA_DATA (tb[IFA_BROADCAST]), |
| buf, BUFSIZ), ifa->ifa_prefixlen); |
| if (tb[IFA_LABEL] && strcmp (ifp->name, RTA_DATA (tb[IFA_LABEL]))) |
| zlog_debug (" IFA_LABEL %s", (char *)RTA_DATA (tb[IFA_LABEL])); |
| |
| if (tb[IFA_CACHEINFO]) |
| { |
| struct ifa_cacheinfo *ci = RTA_DATA (tb[IFA_CACHEINFO]); |
| zlog_debug (" IFA_CACHEINFO pref %d, valid %d", |
| ci->ifa_prefered, ci->ifa_valid); |
| } |
| } |
| |
| /* logic copied from iproute2/ip/ipaddress.c:print_addrinfo() */ |
| if (tb[IFA_LOCAL] == NULL) |
| tb[IFA_LOCAL] = tb[IFA_ADDRESS]; |
| if (tb[IFA_ADDRESS] == NULL) |
| tb[IFA_ADDRESS] = tb[IFA_LOCAL]; |
| |
| /* local interface address */ |
| addr = (tb[IFA_LOCAL] ? RTA_DATA(tb[IFA_LOCAL]) : NULL); |
| |
| /* is there a peer address? */ |
| if (tb[IFA_ADDRESS] && |
| memcmp(RTA_DATA(tb[IFA_ADDRESS]), RTA_DATA(tb[IFA_LOCAL]), RTA_PAYLOAD(tb[IFA_ADDRESS]))) |
| { |
| broad = RTA_DATA(tb[IFA_ADDRESS]); |
| SET_FLAG (flags, ZEBRA_IFA_PEER); |
| } |
| else |
| /* seeking a broadcast address */ |
| broad = (tb[IFA_BROADCAST] ? RTA_DATA(tb[IFA_BROADCAST]) : NULL); |
| |
| /* addr is primary key, SOL if we don't have one */ |
| if (addr == NULL) |
| { |
| zlog_debug ("%s: NULL address", __func__); |
| return -1; |
| } |
| |
| /* Flags. */ |
| if (ifa->ifa_flags & IFA_F_SECONDARY) |
| SET_FLAG (flags, ZEBRA_IFA_SECONDARY); |
| |
| /* Label */ |
| if (tb[IFA_LABEL]) |
| label = (char *) RTA_DATA (tb[IFA_LABEL]); |
| |
| if (ifp && label && strcmp (ifp->name, label) == 0) |
| label = NULL; |
| |
| /* Register interface address to the interface. */ |
| if (ifa->ifa_family == AF_INET) |
| { |
| if (h->nlmsg_type == RTM_NEWADDR) |
| connected_add_ipv4 (ifp, flags, |
| (struct in_addr *) addr, ifa->ifa_prefixlen, |
| (struct in_addr *) broad, label); |
| else |
| connected_delete_ipv4 (ifp, flags, |
| (struct in_addr *) addr, ifa->ifa_prefixlen, |
| (struct in_addr *) broad); |
| } |
| #ifdef HAVE_IPV6 |
| if (ifa->ifa_family == AF_INET6) |
| { |
| if (h->nlmsg_type == RTM_NEWADDR) |
| connected_add_ipv6 (ifp, flags, |
| (struct in6_addr *) addr, ifa->ifa_prefixlen, |
| (struct in6_addr *) broad, label); |
| else |
| connected_delete_ipv6 (ifp, |
| (struct in6_addr *) addr, ifa->ifa_prefixlen, |
| (struct in6_addr *) broad); |
| } |
| #endif /* HAVE_IPV6 */ |
| |
| return 0; |
| } |
| |
| /* Looking up routing table by netlink interface. */ |
| static int |
| netlink_routing_table (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| { |
| int len; |
| struct rtmsg *rtm; |
| struct rtattr *tb[RTA_MAX + 1]; |
| u_char flags = 0; |
| |
| char anyaddr[16] = { 0 }; |
| |
| int index; |
| int table; |
| int metric; |
| |
| void *dest; |
| void *gate; |
| void *src; |
| |
| rtm = NLMSG_DATA (h); |
| |
| if (h->nlmsg_type != RTM_NEWROUTE) |
| return 0; |
| if (rtm->rtm_type != RTN_UNICAST) |
| return 0; |
| |
| table = rtm->rtm_table; |
| #if 0 /* we weed them out later in rib_weed_tables () */ |
| if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
| return 0; |
| #endif |
| |
| len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
| if (len < 0) |
| return -1; |
| |
| memset (tb, 0, sizeof tb); |
| netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); |
| |
| if (rtm->rtm_flags & RTM_F_CLONED) |
| return 0; |
| if (rtm->rtm_protocol == RTPROT_REDIRECT) |
| return 0; |
| if (rtm->rtm_protocol == RTPROT_KERNEL) |
| return 0; |
| |
| if (rtm->rtm_src_len != 0) |
| return 0; |
| |
| /* Route which inserted by Zebra. */ |
| if (rtm->rtm_protocol == RTPROT_ZEBRA) |
| flags |= ZEBRA_FLAG_SELFROUTE; |
| |
| index = 0; |
| metric = 0; |
| dest = NULL; |
| gate = NULL; |
| src = NULL; |
| |
| if (tb[RTA_OIF]) |
| index = *(int *) RTA_DATA (tb[RTA_OIF]); |
| |
| if (tb[RTA_DST]) |
| dest = RTA_DATA (tb[RTA_DST]); |
| else |
| dest = anyaddr; |
| |
| if (tb[RTA_PREFSRC]) |
| src = RTA_DATA (tb[RTA_PREFSRC]); |
| |
| /* Multipath treatment is needed. */ |
| if (tb[RTA_GATEWAY]) |
| gate = RTA_DATA (tb[RTA_GATEWAY]); |
| |
| if (tb[RTA_PRIORITY]) |
| metric = *(int *) RTA_DATA(tb[RTA_PRIORITY]); |
| |
| if (rtm->rtm_family == AF_INET) |
| { |
| struct prefix_ipv4 p; |
| p.family = AF_INET; |
| memcpy (&p.prefix, dest, 4); |
| p.prefixlen = rtm->rtm_dst_len; |
| |
| rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, src, index, table, metric, 0); |
| } |
| #ifdef HAVE_IPV6 |
| if (rtm->rtm_family == AF_INET6) |
| { |
| struct prefix_ipv6 p; |
| p.family = AF_INET6; |
| memcpy (&p.prefix, dest, 16); |
| p.prefixlen = rtm->rtm_dst_len; |
| |
| rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, flags, &p, gate, index, table, |
| metric, 0); |
| } |
| #endif /* HAVE_IPV6 */ |
| |
| return 0; |
| } |
| |
| static const struct message rtproto_str[] = { |
| {RTPROT_REDIRECT, "redirect"}, |
| {RTPROT_KERNEL, "kernel"}, |
| {RTPROT_BOOT, "boot"}, |
| {RTPROT_STATIC, "static"}, |
| {RTPROT_GATED, "GateD"}, |
| {RTPROT_RA, "router advertisement"}, |
| {RTPROT_MRT, "MRT"}, |
| {RTPROT_ZEBRA, "Zebra"}, |
| #ifdef RTPROT_BIRD |
| {RTPROT_BIRD, "BIRD"}, |
| #endif /* RTPROT_BIRD */ |
| {0, NULL} |
| }; |
| |
| /* Routing information change from the kernel. */ |
| static int |
| netlink_route_change (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| { |
| int len; |
| struct rtmsg *rtm; |
| struct rtattr *tb[RTA_MAX + 1]; |
| |
| char anyaddr[16] = { 0 }; |
| |
| int index; |
| int table; |
| int metric; |
| |
| void *dest; |
| void *gate; |
| void *src; |
| |
| rtm = NLMSG_DATA (h); |
| |
| if (!(h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)) |
| { |
| /* If this is not route add/delete message print warning. */ |
| zlog_warn ("Kernel message: %d\n", h->nlmsg_type); |
| return 0; |
| } |
| |
| /* Connected route. */ |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("%s %s %s proto %s", |
| h->nlmsg_type == |
| RTM_NEWROUTE ? "RTM_NEWROUTE" : "RTM_DELROUTE", |
| rtm->rtm_family == AF_INET ? "ipv4" : "ipv6", |
| rtm->rtm_type == RTN_UNICAST ? "unicast" : "multicast", |
| lookup (rtproto_str, rtm->rtm_protocol)); |
| |
| if (rtm->rtm_type != RTN_UNICAST) |
| { |
| return 0; |
| } |
| |
| table = rtm->rtm_table; |
| if (table != RT_TABLE_MAIN && table != zebrad.rtm_table_default) |
| { |
| return 0; |
| } |
| |
| len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct rtmsg)); |
| if (len < 0) |
| return -1; |
| |
| memset (tb, 0, sizeof tb); |
| netlink_parse_rtattr (tb, RTA_MAX, RTM_RTA (rtm), len); |
| |
| if (rtm->rtm_flags & RTM_F_CLONED) |
| return 0; |
| if (rtm->rtm_protocol == RTPROT_REDIRECT) |
| return 0; |
| if (rtm->rtm_protocol == RTPROT_KERNEL) |
| return 0; |
| |
| if (rtm->rtm_protocol == RTPROT_ZEBRA && h->nlmsg_type == RTM_NEWROUTE) |
| return 0; |
| |
| if (rtm->rtm_src_len != 0) |
| { |
| zlog_warn ("netlink_route_change(): no src len"); |
| return 0; |
| } |
| |
| index = 0; |
| metric = 0; |
| dest = NULL; |
| gate = NULL; |
| src = NULL; |
| |
| if (tb[RTA_OIF]) |
| index = *(int *) RTA_DATA (tb[RTA_OIF]); |
| |
| if (tb[RTA_DST]) |
| dest = RTA_DATA (tb[RTA_DST]); |
| else |
| dest = anyaddr; |
| |
| if (tb[RTA_GATEWAY]) |
| gate = RTA_DATA (tb[RTA_GATEWAY]); |
| |
| if (tb[RTA_PREFSRC]) |
| src = RTA_DATA (tb[RTA_PREFSRC]); |
| |
| if (h->nlmsg_type == RTM_NEWROUTE && tb[RTA_PRIORITY]) |
| metric = *(int *) RTA_DATA(tb[RTA_PRIORITY]); |
| |
| if (rtm->rtm_family == AF_INET) |
| { |
| struct prefix_ipv4 p; |
| p.family = AF_INET; |
| memcpy (&p.prefix, dest, 4); |
| p.prefixlen = rtm->rtm_dst_len; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| { |
| if (h->nlmsg_type == RTM_NEWROUTE) |
| zlog_debug ("RTM_NEWROUTE %s/%d", |
| inet_ntoa (p.prefix), p.prefixlen); |
| else |
| zlog_debug ("RTM_DELROUTE %s/%d", |
| inet_ntoa (p.prefix), p.prefixlen); |
| } |
| |
| if (h->nlmsg_type == RTM_NEWROUTE) |
| rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, src, index, table, metric, 0); |
| else |
| rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table); |
| } |
| |
| #ifdef HAVE_IPV6 |
| if (rtm->rtm_family == AF_INET6) |
| { |
| struct prefix_ipv6 p; |
| char buf[BUFSIZ]; |
| |
| p.family = AF_INET6; |
| memcpy (&p.prefix, dest, 16); |
| p.prefixlen = rtm->rtm_dst_len; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| { |
| if (h->nlmsg_type == RTM_NEWROUTE) |
| zlog_debug ("RTM_NEWROUTE %s/%d", |
| inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
| p.prefixlen); |
| else |
| zlog_debug ("RTM_DELROUTE %s/%d", |
| inet_ntop (AF_INET6, &p.prefix, buf, BUFSIZ), |
| p.prefixlen); |
| } |
| |
| if (h->nlmsg_type == RTM_NEWROUTE) |
| rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table, metric, 0); |
| else |
| rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, &p, gate, index, table); |
| } |
| #endif /* HAVE_IPV6 */ |
| |
| return 0; |
| } |
| |
| static int |
| netlink_link_change (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| { |
| int len; |
| struct ifinfomsg *ifi; |
| struct rtattr *tb[IFLA_MAX + 1]; |
| struct interface *ifp; |
| char *name; |
| |
| ifi = NLMSG_DATA (h); |
| |
| if (!(h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)) |
| { |
| /* If this is not link add/delete message so print warning. */ |
| zlog_warn ("netlink_link_change: wrong kernel message %d\n", |
| h->nlmsg_type); |
| return 0; |
| } |
| |
| len = h->nlmsg_len - NLMSG_LENGTH (sizeof (struct ifinfomsg)); |
| if (len < 0) |
| return -1; |
| |
| /* Looking up interface name. */ |
| memset (tb, 0, sizeof tb); |
| netlink_parse_rtattr (tb, IFLA_MAX, IFLA_RTA (ifi), len); |
| |
| #ifdef IFLA_WIRELESS |
| /* check for wireless messages to ignore */ |
| if ((tb[IFLA_WIRELESS] != NULL) && (ifi->ifi_change == 0)) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("%s: ignoring IFLA_WIRELESS message", __func__); |
| return 0; |
| } |
| #endif /* IFLA_WIRELESS */ |
| |
| if (tb[IFLA_IFNAME] == NULL) |
| return -1; |
| name = (char *) RTA_DATA (tb[IFLA_IFNAME]); |
| |
| /* Add interface. */ |
| if (h->nlmsg_type == RTM_NEWLINK) |
| { |
| ifp = if_lookup_by_name (name); |
| |
| if (ifp == NULL || !CHECK_FLAG (ifp->status, ZEBRA_INTERFACE_ACTIVE)) |
| { |
| if (ifp == NULL) |
| ifp = if_get_by_name (name); |
| |
| set_ifindex(ifp, ifi->ifi_index); |
| ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
| ifp->metric = 1; |
| |
| /* If new link is added. */ |
| if_add_update (ifp); |
| } |
| else |
| { |
| /* Interface status change. */ |
| set_ifindex(ifp, ifi->ifi_index); |
| ifp->mtu6 = ifp->mtu = *(int *) RTA_DATA (tb[IFLA_MTU]); |
| ifp->metric = 1; |
| |
| if (if_is_operative (ifp)) |
| { |
| ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| if (!if_is_operative (ifp)) |
| if_down (ifp); |
| else |
| /* Must notify client daemons of new interface status. */ |
| zebra_interface_up_update (ifp); |
| } |
| else |
| { |
| ifp->flags = ifi->ifi_flags & 0x0000fffff; |
| if (if_is_operative (ifp)) |
| if_up (ifp); |
| } |
| } |
| } |
| else |
| { |
| /* RTM_DELLINK. */ |
| ifp = if_lookup_by_name (name); |
| |
| if (ifp == NULL) |
| { |
| zlog (NULL, LOG_WARNING, "interface %s is deleted but can't find", |
| name); |
| return 0; |
| } |
| |
| if_delete_update (ifp); |
| } |
| |
| return 0; |
| } |
| |
| static int |
| netlink_information_fetch (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| { |
| /* JF: Ignore messages that aren't from the kernel */ |
| if ( snl->nl_pid != 0 ) |
| { |
| zlog ( NULL, LOG_ERR, "Ignoring message from pid %u", snl->nl_pid ); |
| return 0; |
| } |
| |
| switch (h->nlmsg_type) |
| { |
| case RTM_NEWROUTE: |
| return netlink_route_change (snl, h); |
| break; |
| case RTM_DELROUTE: |
| return netlink_route_change (snl, h); |
| break; |
| case RTM_NEWLINK: |
| return netlink_link_change (snl, h); |
| break; |
| case RTM_DELLINK: |
| return netlink_link_change (snl, h); |
| break; |
| case RTM_NEWADDR: |
| return netlink_interface_addr (snl, h); |
| break; |
| case RTM_DELADDR: |
| return netlink_interface_addr (snl, h); |
| break; |
| default: |
| zlog_warn ("Unknown netlink nlmsg_type %d\n", h->nlmsg_type); |
| break; |
| } |
| return 0; |
| } |
| |
| /* Interface lookup by netlink socket. */ |
| int |
| interface_lookup_netlink (void) |
| { |
| int ret; |
| |
| /* Get interface information. */ |
| ret = netlink_request (AF_PACKET, RTM_GETLINK, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| ret = netlink_parse_info (netlink_interface, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| |
| /* Get IPv4 address of the interfaces. */ |
| ret = netlink_request (AF_INET, RTM_GETADDR, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| |
| #ifdef HAVE_IPV6 |
| /* Get IPv6 address of the interfaces. */ |
| ret = netlink_request (AF_INET6, RTM_GETADDR, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| ret = netlink_parse_info (netlink_interface_addr, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| #endif /* HAVE_IPV6 */ |
| |
| return 0; |
| } |
| |
| /* Routing table read function using netlink interface. Only called |
| bootstrap time. */ |
| int |
| netlink_route_read (void) |
| { |
| int ret; |
| |
| /* Get IPv4 routing table. */ |
| ret = netlink_request (AF_INET, RTM_GETROUTE, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| |
| #ifdef HAVE_IPV6 |
| /* Get IPv6 routing table. */ |
| ret = netlink_request (AF_INET6, RTM_GETROUTE, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| ret = netlink_parse_info (netlink_routing_table, &netlink_cmd); |
| if (ret < 0) |
| return ret; |
| #endif /* HAVE_IPV6 */ |
| |
| return 0; |
| } |
| |
| /* Utility function comes from iproute2. |
| Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ |
| static int |
| addattr_l (struct nlmsghdr *n, int maxlen, int type, void *data, int alen) |
| { |
| int len; |
| struct rtattr *rta; |
| |
| len = RTA_LENGTH (alen); |
| |
| if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
| return -1; |
| |
| rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
| rta->rta_type = type; |
| rta->rta_len = len; |
| memcpy (RTA_DATA (rta), data, alen); |
| n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
| |
| return 0; |
| } |
| |
| static int |
| rta_addattr_l (struct rtattr *rta, int maxlen, int type, void *data, int alen) |
| { |
| int len; |
| struct rtattr *subrta; |
| |
| len = RTA_LENGTH (alen); |
| |
| if (RTA_ALIGN (rta->rta_len) + len > maxlen) |
| return -1; |
| |
| subrta = (struct rtattr *) (((char *) rta) + RTA_ALIGN (rta->rta_len)); |
| subrta->rta_type = type; |
| subrta->rta_len = len; |
| memcpy (RTA_DATA (subrta), data, alen); |
| rta->rta_len = NLMSG_ALIGN (rta->rta_len) + len; |
| |
| return 0; |
| } |
| |
| /* Utility function comes from iproute2. |
| Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> */ |
| static int |
| addattr32 (struct nlmsghdr *n, int maxlen, int type, int data) |
| { |
| int len; |
| struct rtattr *rta; |
| |
| len = RTA_LENGTH (4); |
| |
| if (NLMSG_ALIGN (n->nlmsg_len) + len > maxlen) |
| return -1; |
| |
| rta = (struct rtattr *) (((char *) n) + NLMSG_ALIGN (n->nlmsg_len)); |
| rta->rta_type = type; |
| rta->rta_len = len; |
| memcpy (RTA_DATA (rta), &data, 4); |
| n->nlmsg_len = NLMSG_ALIGN (n->nlmsg_len) + len; |
| |
| return 0; |
| } |
| |
| static int |
| netlink_talk_filter (struct sockaddr_nl *snl, struct nlmsghdr *h) |
| { |
| zlog_warn ("netlink_talk: ignoring message type 0x%04x", h->nlmsg_type); |
| return 0; |
| } |
| |
| /* sendmsg() to netlink socket then recvmsg(). */ |
| static int |
| netlink_talk (struct nlmsghdr *n, struct nlsock *nl) |
| { |
| int status; |
| struct sockaddr_nl snl; |
| struct iovec iov = { (void *) n, n->nlmsg_len }; |
| struct msghdr msg = { (void *) &snl, sizeof snl, &iov, 1, NULL, 0, 0 }; |
| int save_errno; |
| |
| memset (&snl, 0, sizeof snl); |
| snl.nl_family = AF_NETLINK; |
| |
| n->nlmsg_seq = ++nl->seq; |
| |
| /* Request an acknowledgement by setting NLM_F_ACK */ |
| n->nlmsg_flags |= NLM_F_ACK; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("netlink_talk: %s type %s(%u), seq=%u", nl->name, |
| lookup (nlmsg_str, n->nlmsg_type), n->nlmsg_type, |
| n->nlmsg_seq); |
| |
| /* Send message to netlink interface. */ |
| if (zserv_privs.change (ZPRIVS_RAISE)) |
| zlog (NULL, LOG_ERR, "Can't raise privileges"); |
| status = sendmsg (nl->sock, &msg, 0); |
| save_errno = errno; |
| if (zserv_privs.change (ZPRIVS_LOWER)) |
| zlog (NULL, LOG_ERR, "Can't lower privileges"); |
| |
| if (status < 0) |
| { |
| zlog (NULL, LOG_ERR, "netlink_talk sendmsg() error: %s", |
| safe_strerror (save_errno)); |
| return -1; |
| } |
| |
| |
| /* |
| * Get reply from netlink socket. |
| * The reply should either be an acknowlegement or an error. |
| */ |
| return netlink_parse_info (netlink_talk_filter, nl); |
| } |
| |
| /* Routing table change via netlink interface. */ |
| static int |
| netlink_route (int cmd, int family, void *dest, int length, void *gate, |
| int index, int zebra_flags, int table) |
| { |
| int ret; |
| int bytelen; |
| struct sockaddr_nl snl; |
| int discard; |
| |
| struct |
| { |
| struct nlmsghdr n; |
| struct rtmsg r; |
| char buf[1024]; |
| } req; |
| |
| memset (&req, 0, sizeof req); |
| |
| bytelen = (family == AF_INET ? 4 : 16); |
| |
| req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); |
| req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; |
| req.n.nlmsg_type = cmd; |
| req.r.rtm_family = family; |
| req.r.rtm_table = table; |
| req.r.rtm_dst_len = length; |
| req.r.rtm_protocol = RTPROT_ZEBRA; |
| req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| |
| if ((zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
| || (zebra_flags & ZEBRA_FLAG_REJECT)) |
| discard = 1; |
| else |
| discard = 0; |
| |
| if (cmd == RTM_NEWROUTE) |
| { |
| if (discard) |
| { |
| if (zebra_flags & ZEBRA_FLAG_BLACKHOLE) |
| req.r.rtm_type = RTN_BLACKHOLE; |
| else if (zebra_flags & ZEBRA_FLAG_REJECT) |
| req.r.rtm_type = RTN_UNREACHABLE; |
| else |
| assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ |
| } |
| else |
| req.r.rtm_type = RTN_UNICAST; |
| } |
| |
| if (dest) |
| addattr_l (&req.n, sizeof req, RTA_DST, dest, bytelen); |
| |
| if (!discard) |
| { |
| if (gate) |
| addattr_l (&req.n, sizeof req, RTA_GATEWAY, gate, bytelen); |
| if (index > 0) |
| addattr32 (&req.n, sizeof req, RTA_OIF, index); |
| } |
| |
| /* Destination netlink address. */ |
| memset (&snl, 0, sizeof snl); |
| snl.nl_family = AF_NETLINK; |
| |
| /* Talk to netlink socket. */ |
| ret = netlink_talk (&req.n, &netlink_cmd); |
| if (ret < 0) |
| return -1; |
| |
| return 0; |
| } |
| |
| /* Routing table change via netlink interface. */ |
| static int |
| netlink_route_multipath (int cmd, struct prefix *p, struct rib *rib, |
| int family) |
| { |
| int bytelen; |
| struct sockaddr_nl snl; |
| struct nexthop *nexthop = NULL; |
| int nexthop_num = 0; |
| int discard; |
| |
| struct |
| { |
| struct nlmsghdr n; |
| struct rtmsg r; |
| char buf[1024]; |
| } req; |
| |
| memset (&req, 0, sizeof req); |
| |
| bytelen = (family == AF_INET ? 4 : 16); |
| |
| req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct rtmsg)); |
| req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST; |
| req.n.nlmsg_type = cmd; |
| req.r.rtm_family = family; |
| req.r.rtm_table = rib->table; |
| req.r.rtm_dst_len = p->prefixlen; |
| req.r.rtm_protocol = RTPROT_ZEBRA; |
| req.r.rtm_scope = RT_SCOPE_UNIVERSE; |
| |
| if ((rib->flags & ZEBRA_FLAG_BLACKHOLE) || (rib->flags & ZEBRA_FLAG_REJECT)) |
| discard = 1; |
| else |
| discard = 0; |
| |
| if (cmd == RTM_NEWROUTE) |
| { |
| if (discard) |
| { |
| if (rib->flags & ZEBRA_FLAG_BLACKHOLE) |
| req.r.rtm_type = RTN_BLACKHOLE; |
| else if (rib->flags & ZEBRA_FLAG_REJECT) |
| req.r.rtm_type = RTN_UNREACHABLE; |
| else |
| assert (RTN_BLACKHOLE != RTN_UNREACHABLE); /* false */ |
| } |
| else |
| req.r.rtm_type = RTN_UNICAST; |
| } |
| |
| addattr_l (&req.n, sizeof req, RTA_DST, &p->u.prefix, bytelen); |
| |
| /* Metric. */ |
| addattr32 (&req.n, sizeof req, RTA_PRIORITY, rib->metric); |
| |
| if (discard) |
| { |
| if (cmd == RTM_NEWROUTE) |
| for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
| SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| goto skip; |
| } |
| |
| /* Multipath case. */ |
| if (rib->nexthop_active_num == 1 || MULTIPATH_NUM == 1) |
| { |
| for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next) |
| { |
| |
| if ((cmd == RTM_NEWROUTE |
| && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) |
| || (cmd == RTM_DELROUTE |
| && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) |
| { |
| |
| if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| { |
| zlog_debug |
| ("netlink_route_multipath() (recursive, 1 hop): " |
| "%s %s/%d, type %s", lookup (nlmsg_str, cmd), |
| #ifdef HAVE_IPV6 |
| (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
| inet6_ntoa (p->u.prefix6), |
| #else |
| inet_ntoa (p->u.prefix4), |
| #endif /* HAVE_IPV6 */ |
| |
| p->prefixlen, nexthop_types_desc[nexthop->rtype]); |
| } |
| |
| if (nexthop->rtype == NEXTHOP_TYPE_IPV4 |
| || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) |
| { |
| addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| &nexthop->rgate.ipv4, bytelen); |
| if (nexthop->src.ipv4.s_addr) |
| addattr_l(&req.n, sizeof req, RTA_PREFSRC, |
| &nexthop->src.ipv4, bytelen); |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (recursive, " |
| "1 hop): nexthop via %s if %u", |
| inet_ntoa (nexthop->rgate.ipv4), |
| nexthop->rifindex); |
| } |
| #ifdef HAVE_IPV6 |
| if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
| || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| { |
| addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| &nexthop->rgate.ipv6, bytelen); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (recursive, " |
| "1 hop): nexthop via %s if %u", |
| inet6_ntoa (nexthop->rgate.ipv6), |
| nexthop->rifindex); |
| } |
| #endif /* HAVE_IPV6 */ |
| if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IFNAME |
| || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| { |
| addattr32 (&req.n, sizeof req, RTA_OIF, |
| nexthop->rifindex); |
| if ((nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IFINDEX) |
| && nexthop->src.ipv4.s_addr) |
| addattr_l (&req.n, sizeof req, RTA_PREFSRC, |
| &nexthop->src.ipv4, bytelen); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (recursive, " |
| "1 hop): nexthop via if %u", |
| nexthop->rifindex); |
| } |
| } |
| else |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| { |
| zlog_debug |
| ("netlink_route_multipath() (single hop): " |
| "%s %s/%d, type %s", lookup (nlmsg_str, cmd), |
| #ifdef HAVE_IPV6 |
| (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
| inet6_ntoa (p->u.prefix6), |
| #else |
| inet_ntoa (p->u.prefix4), |
| #endif /* HAVE_IPV6 */ |
| p->prefixlen, nexthop_types_desc[nexthop->type]); |
| } |
| |
| if (nexthop->type == NEXTHOP_TYPE_IPV4 |
| || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) |
| { |
| addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| &nexthop->gate.ipv4, bytelen); |
| if (nexthop->src.ipv4.s_addr) |
| addattr_l (&req.n, sizeof req, RTA_PREFSRC, |
| &nexthop->src.ipv4, bytelen); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (single hop): " |
| "nexthop via %s if %u", |
| inet_ntoa (nexthop->gate.ipv4), |
| nexthop->ifindex); |
| } |
| #ifdef HAVE_IPV6 |
| if (nexthop->type == NEXTHOP_TYPE_IPV6 |
| || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| { |
| addattr_l (&req.n, sizeof req, RTA_GATEWAY, |
| &nexthop->gate.ipv6, bytelen); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (single hop): " |
| "nexthop via %s if %u", |
| inet6_ntoa (nexthop->gate.ipv6), |
| nexthop->ifindex); |
| } |
| #endif /* HAVE_IPV6 */ |
| if (nexthop->type == NEXTHOP_TYPE_IFINDEX |
| || nexthop->type == NEXTHOP_TYPE_IFNAME |
| || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) |
| { |
| addattr32 (&req.n, sizeof req, RTA_OIF, nexthop->ifindex); |
| |
| if (nexthop->src.ipv4.s_addr) |
| addattr_l (&req.n, sizeof req, RTA_PREFSRC, |
| &nexthop->src.ipv4, bytelen); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (single hop): " |
| "nexthop via if %u", nexthop->ifindex); |
| } |
| else if (nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX |
| || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME) |
| { |
| addattr32 (&req.n, sizeof req, RTA_OIF, nexthop->ifindex); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (single hop): " |
| "nexthop via if %u", nexthop->ifindex); |
| } |
| } |
| |
| if (cmd == RTM_NEWROUTE) |
| SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| |
| nexthop_num++; |
| break; |
| } |
| } |
| } |
| else |
| { |
| char buf[1024]; |
| struct rtattr *rta = (void *) buf; |
| struct rtnexthop *rtnh; |
| union g_addr *src = NULL; |
| |
| rta->rta_type = RTA_MULTIPATH; |
| rta->rta_len = RTA_LENGTH (0); |
| rtnh = RTA_DATA (rta); |
| |
| nexthop_num = 0; |
| for (nexthop = rib->nexthop; |
| nexthop && (MULTIPATH_NUM == 0 || nexthop_num < MULTIPATH_NUM); |
| nexthop = nexthop->next) |
| { |
| if ((cmd == RTM_NEWROUTE |
| && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE)) |
| || (cmd == RTM_DELROUTE |
| && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB))) |
| { |
| nexthop_num++; |
| |
| rtnh->rtnh_len = sizeof (*rtnh); |
| rtnh->rtnh_flags = 0; |
| rtnh->rtnh_hops = 0; |
| rta->rta_len += rtnh->rtnh_len; |
| |
| if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE)) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| { |
| zlog_debug ("netlink_route_multipath() " |
| "(recursive, multihop): %s %s/%d type %s", |
| lookup (nlmsg_str, cmd), |
| #ifdef HAVE_IPV6 |
| (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
| inet6_ntoa (p->u.prefix6), |
| #else |
| inet_ntoa (p->u.prefix4), |
| #endif /* HAVE_IPV6 */ |
| p->prefixlen, nexthop_types_desc[nexthop->rtype]); |
| } |
| if (nexthop->rtype == NEXTHOP_TYPE_IPV4 |
| || nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX) |
| { |
| rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| &nexthop->rgate.ipv4, bytelen); |
| rtnh->rtnh_len += sizeof (struct rtattr) + 4; |
| |
| if (nexthop->src.ipv4.s_addr) |
| src = &nexthop->src; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (recursive, " |
| "multihop): nexthop via %s if %u", |
| inet_ntoa (nexthop->rgate.ipv4), |
| nexthop->rifindex); |
| } |
| #ifdef HAVE_IPV6 |
| if (nexthop->rtype == NEXTHOP_TYPE_IPV6 |
| || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME |
| || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX) |
| { |
| rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| &nexthop->rgate.ipv6, bytelen); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (recursive, " |
| "multihop): nexthop via %s if %u", |
| inet6_ntoa (nexthop->rgate.ipv6), |
| nexthop->rifindex); |
| } |
| #endif /* HAVE_IPV6 */ |
| /* ifindex */ |
| if (nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IFNAME) |
| { |
| rtnh->rtnh_ifindex = nexthop->rifindex; |
| if (nexthop->src.ipv4.s_addr) |
| src = &nexthop->src; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (recursive, " |
| "multihop): nexthop via if %u", |
| nexthop->rifindex); |
| } |
| else if (nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX |
| || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME) |
| { |
| rtnh->rtnh_ifindex = nexthop->rifindex; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (recursive, " |
| "multihop): nexthop via if %u", |
| nexthop->rifindex); |
| } |
| else |
| { |
| rtnh->rtnh_ifindex = 0; |
| } |
| } |
| else |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| { |
| zlog_debug ("netlink_route_multipath() (multihop): " |
| "%s %s/%d, type %s", lookup (nlmsg_str, cmd), |
| #ifdef HAVE_IPV6 |
| (family == AF_INET) ? inet_ntoa (p->u.prefix4) : |
| inet6_ntoa (p->u.prefix6), |
| #else |
| inet_ntoa (p->u.prefix4), |
| #endif /* HAVE_IPV6 */ |
| p->prefixlen, nexthop_types_desc[nexthop->type]); |
| } |
| if (nexthop->type == NEXTHOP_TYPE_IPV4 |
| || nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) |
| { |
| rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| &nexthop->gate.ipv4, bytelen); |
| rtnh->rtnh_len += sizeof (struct rtattr) + 4; |
| |
| if (nexthop->src.ipv4.s_addr) |
| src = &nexthop->src; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (multihop): " |
| "nexthop via %s if %u", |
| inet_ntoa (nexthop->gate.ipv4), |
| nexthop->ifindex); |
| } |
| #ifdef HAVE_IPV6 |
| if (nexthop->type == NEXTHOP_TYPE_IPV6 |
| || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| { |
| rta_addattr_l (rta, 4096, RTA_GATEWAY, |
| &nexthop->gate.ipv6, bytelen); |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (multihop): " |
| "nexthop via %s if %u", |
| inet6_ntoa (nexthop->gate.ipv6), |
| nexthop->ifindex); |
| } |
| #endif /* HAVE_IPV6 */ |
| /* ifindex */ |
| if (nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX |
| || nexthop->type == NEXTHOP_TYPE_IFINDEX |
| || nexthop->type == NEXTHOP_TYPE_IFNAME) |
| { |
| rtnh->rtnh_ifindex = nexthop->ifindex; |
| if (nexthop->src.ipv4.s_addr) |
| src = &nexthop->src; |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (multihop): " |
| "nexthop via if %u", nexthop->ifindex); |
| } |
| else if (nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME |
| || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) |
| { |
| rtnh->rtnh_ifindex = nexthop->ifindex; |
| |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug("netlink_route_multipath() (multihop): " |
| "nexthop via if %u", nexthop->ifindex); |
| } |
| else |
| { |
| rtnh->rtnh_ifindex = 0; |
| } |
| } |
| rtnh = RTNH_NEXT (rtnh); |
| |
| if (cmd == RTM_NEWROUTE) |
| SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB); |
| } |
| } |
| if (src) |
| addattr_l (&req.n, sizeof req, RTA_PREFSRC, &src->ipv4, bytelen); |
| |
| if (rta->rta_len > RTA_LENGTH (0)) |
| addattr_l (&req.n, 1024, RTA_MULTIPATH, RTA_DATA (rta), |
| RTA_PAYLOAD (rta)); |
| } |
| |
| /* If there is no useful nexthop then return. */ |
| if (nexthop_num == 0) |
| { |
| if (IS_ZEBRA_DEBUG_KERNEL) |
| zlog_debug ("netlink_route_multipath(): No useful nexthop."); |
| return 0; |
| } |
| |
| skip: |
| |
| /* Destination netlink address. */ |
| memset (&snl, 0, sizeof snl); |
| snl.nl_family = AF_NETLINK; |
| |
| /* Talk to netlink socket. */ |
| return netlink_talk (&req.n, &netlink_cmd); |
| } |
| |
| int |
| kernel_add_ipv4 (struct prefix *p, struct rib *rib) |
| { |
| return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET); |
| } |
| |
| int |
| kernel_delete_ipv4 (struct prefix *p, struct rib *rib) |
| { |
| return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET); |
| } |
| |
| #ifdef HAVE_IPV6 |
| int |
| kernel_add_ipv6 (struct prefix *p, struct rib *rib) |
| { |
| return netlink_route_multipath (RTM_NEWROUTE, p, rib, AF_INET6); |
| } |
| |
| int |
| kernel_delete_ipv6 (struct prefix *p, struct rib *rib) |
| { |
| return netlink_route_multipath (RTM_DELROUTE, p, rib, AF_INET6); |
| } |
| |
| /* Delete IPv6 route from the kernel. */ |
| int |
| kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate, |
| unsigned int index, int flags, int table) |
| { |
| return netlink_route (RTM_DELROUTE, AF_INET6, &dest->prefix, |
| dest->prefixlen, gate, index, flags, table); |
| } |
| #endif /* HAVE_IPV6 */ |
| |
| /* Interface address modification. */ |
| static int |
| netlink_address (int cmd, int family, struct interface *ifp, |
| struct connected *ifc) |
| { |
| int bytelen; |
| struct prefix *p; |
| |
| struct |
| { |
| struct nlmsghdr n; |
| struct ifaddrmsg ifa; |
| char buf[1024]; |
| } req; |
| |
| p = ifc->address; |
| memset (&req, 0, sizeof req); |
| |
| bytelen = (family == AF_INET ? 4 : 16); |
| |
| req.n.nlmsg_len = NLMSG_LENGTH (sizeof (struct ifaddrmsg)); |
| req.n.nlmsg_flags = NLM_F_REQUEST; |
| req.n.nlmsg_type = cmd; |
| req.ifa.ifa_family = family; |
| |
| req.ifa.ifa_index = ifp->ifindex; |
| req.ifa.ifa_prefixlen = p->prefixlen; |
| |
| addattr_l (&req.n, sizeof req, IFA_LOCAL, &p->u.prefix, bytelen); |
| |
| if (family == AF_INET && cmd == RTM_NEWADDR) |
| { |
| if (!CONNECTED_PEER(ifc) && ifc->destination) |
| { |
| p = ifc->destination; |
| addattr_l (&req.n, sizeof req, IFA_BROADCAST, &p->u.prefix, |
| bytelen); |
| } |
| } |
| |
| if (CHECK_FLAG (ifc->flags, ZEBRA_IFA_SECONDARY)) |
| SET_FLAG (req.ifa.ifa_flags, IFA_F_SECONDARY); |
| |
| if (ifc->label) |
| addattr_l (&req.n, sizeof req, IFA_LABEL, ifc->label, |
| strlen (ifc->label) + 1); |
| |
| return netlink_talk (&req.n, &netlink_cmd); |
| } |
| |
| int |
| kernel_address_add_ipv4 (struct interface *ifp, struct connected *ifc) |
| { |
| return netlink_address (RTM_NEWADDR, AF_INET, ifp, ifc); |
| } |
| |
| int |
| kernel_address_delete_ipv4 (struct interface *ifp, struct connected *ifc) |
| { |
| return netlink_address (RTM_DELADDR, AF_INET, ifp, ifc); |
| } |
| |
| |
| extern struct thread_master *master; |
| |
| /* Kernel route reflection. */ |
| static int |
| kernel_read (struct thread *thread) |
| { |
| netlink_parse_info (netlink_information_fetch, &netlink); |
| thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
| |
| return 0; |
| } |
| |
| /* Filter out messages from self that occur on listener socket, |
| caused by our actions on the command socket |
| */ |
| static void netlink_install_filter (int sock, __u32 pid) |
| { |
| struct sock_filter filter[] = { |
| /* 0: ldh [4] */ |
| BPF_STMT(BPF_LD|BPF_ABS|BPF_H, offsetof(struct nlmsghdr, nlmsg_type)), |
| /* 1: jeq 0x18 jt 3 jf 6 */ |
| BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, htons(RTM_NEWROUTE), 1, 0), |
| /* 2: jeq 0x19 jt 3 jf 6 */ |
| BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, htons(RTM_DELROUTE), 0, 3), |
| /* 3: ldw [12] */ |
| BPF_STMT(BPF_LD|BPF_ABS|BPF_W, offsetof(struct nlmsghdr, nlmsg_pid)), |
| /* 4: jeq XX jt 5 jf 6 */ |
| BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, htonl(pid), 0, 1), |
| /* 5: ret 0 (skip) */ |
| BPF_STMT(BPF_RET|BPF_K, 0), |
| /* 6: ret 0xffff (keep) */ |
| BPF_STMT(BPF_RET|BPF_K, 0xffff), |
| }; |
| |
| struct sock_fprog prog = { |
| .len = sizeof(filter) / sizeof(filter[0]), |
| .filter = filter, |
| }; |
| |
| if (setsockopt(sock, SOL_SOCKET, SO_ATTACH_FILTER, &prog, sizeof(prog)) < 0) |
| zlog_warn ("Can't install socket filter: %s\n", safe_strerror(errno)); |
| } |
| |
| /* Exported interface function. This function simply calls |
| netlink_socket (). */ |
| void |
| kernel_init (void) |
| { |
| unsigned long groups; |
| |
| groups = RTMGRP_LINK | RTMGRP_IPV4_ROUTE | RTMGRP_IPV4_IFADDR; |
| #ifdef HAVE_IPV6 |
| groups |= RTMGRP_IPV6_ROUTE | RTMGRP_IPV6_IFADDR; |
| #endif /* HAVE_IPV6 */ |
| netlink_socket (&netlink, groups); |
| netlink_socket (&netlink_cmd, 0); |
| |
| /* Register kernel socket. */ |
| if (netlink.sock > 0) |
| { |
| /* Only want non-blocking on the netlink event socket */ |
| if (fcntl (netlink.sock, F_SETFL, O_NONBLOCK) < 0) |
| zlog (NULL, LOG_ERR, "Can't set %s socket flags: %s", netlink.name, |
| safe_strerror (errno)); |
| |
| /* Set receive buffer size if it's set from command line */ |
| if (nl_rcvbufsize) |
| netlink_recvbuf (&netlink, nl_rcvbufsize); |
| |
| netlink_install_filter (netlink.sock, netlink_cmd.snl.nl_pid); |
| thread_add_read (zebrad.master, kernel_read, NULL, netlink.sock); |
| } |
| } |