Cleanup in sysdep KRT code, part 2.

Remove support for historic Linux kernels,
merge krt-iface, krt-set and krt-scan stub headers.

1 files changed, 0 insertions, 1149 deletions

diff --git a/sysdep/linux/netlink/netlink.c b/sysdep/linux/netlink/netlink.c
deleted file mode 100644
index e3faf043..00000000
--- a/sysdep/linux/netlink/netlink.c
+++ /dev/null
@@ -1,1149 +0,0 @@
-/*
- *	BIRD -- Linux Netlink Interface
- *
- *	(c) 1999--2000 Martin Mares <mj@ucw.cz>
- *
- *	Can be freely distributed and used under the terms of the GNU GPL.
- */
-
-#include <stdio.h>
-#include <fcntl.h>
-#include <sys/socket.h>
-#include <sys/uio.h>
-#include <errno.h>
-
-#undef LOCAL_DEBUG
-
-#include "nest/bird.h"
-#include "nest/route.h"
-#include "nest/protocol.h"
-#include "nest/iface.h"
-#include "lib/alloca.h"
-#include "lib/timer.h"
-#include "lib/unix.h"
-#include "lib/krt.h"
-#include "lib/socket.h"
-#include "lib/string.h"
-#include "conf/conf.h"
-
-#include <asm/types.h>
-#include <linux/if.h>
-#include <linux/netlink.h>
-#include <linux/rtnetlink.h>
-
-#ifndef MSG_TRUNC			/* Hack: Several versions of glibc miss this one :( */
-#define MSG_TRUNC 0x20
-#endif
-
-#ifndef IFF_LOWER_UP
-#define IFF_LOWER_UP 0x10000
-#endif
-
-/*
- *	Synchronous Netlink interface
- */
-
-struct nl_sock
-{
-  int fd;
-  u32 seq;
-  byte *rx_buffer;			/* Receive buffer */
-  struct nlmsghdr *last_hdr;		/* Recently received packet */
-  unsigned int last_size;
-};
-
-#define NL_RX_SIZE 8192
-
-static struct nl_sock nl_scan = {.fd = -1};	/* Netlink socket for synchronous scan */
-static struct nl_sock nl_req  = {.fd = -1};	/* Netlink socket for requests */
-
-static void
-nl_open_sock(struct nl_sock *nl)
-{
-  if (nl->fd < 0)
-    {
-      nl->fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-      if (nl->fd < 0)
-	die("Unable to open rtnetlink socket: %m");
-      nl->seq = now;
-      nl->rx_buffer = xmalloc(NL_RX_SIZE);
-      nl->last_hdr = NULL;
-      nl->last_size = 0;
-    }
-}
-
-static void
-nl_open(void)
-{
-  nl_open_sock(&nl_scan);
-  nl_open_sock(&nl_req);
-}
-
-static void
-nl_send(struct nl_sock *nl, struct nlmsghdr *nh)
-{
-  struct sockaddr_nl sa;
-
-  memset(&sa, 0, sizeof(sa));
-  sa.nl_family = AF_NETLINK;
-  nh->nlmsg_pid = 0;
-  nh->nlmsg_seq = ++(nl->seq);
-  if (sendto(nl->fd, nh, nh->nlmsg_len, 0, (struct sockaddr *)&sa, sizeof(sa)) < 0)
-    die("rtnetlink sendto: %m");
-  nl->last_hdr = NULL;
-}
-
-static void
-nl_request_dump(int cmd)
-{
-  struct {
-    struct nlmsghdr nh;
-    struct rtgenmsg g;
-  } req;
-  req.nh.nlmsg_type = cmd;
-  req.nh.nlmsg_len = sizeof(req);
-  req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
-  /* Is it important which PF_* is used for link-level interface scan?
-     It seems that some information is available only when PF_INET is used. */
-  req.g.rtgen_family = (cmd == RTM_GETLINK) ? PF_INET : BIRD_PF;
-  nl_send(&nl_scan, &req.nh);
-}
-
-static struct nlmsghdr *
-nl_get_reply(struct nl_sock *nl)
-{
-  for(;;)
-    {
-      if (!nl->last_hdr)
-	{
-	  struct iovec iov = { nl->rx_buffer, NL_RX_SIZE };
-	  struct sockaddr_nl sa;
-	  struct msghdr m = { (struct sockaddr *) &sa, sizeof(sa), &iov, 1, NULL, 0, 0 };
-	  int x = recvmsg(nl->fd, &m, 0);
-	  if (x < 0)
-	    die("nl_get_reply: %m");
-	  if (sa.nl_pid)		/* It isn't from the kernel */
-	    {
-	      DBG("Non-kernel packet\n");
-	      continue;
-	    }
-	  nl->last_size = x;
-	  nl->last_hdr = (void *) nl->rx_buffer;
-	  if (m.msg_flags & MSG_TRUNC)
-	    bug("nl_get_reply: got truncated reply which should be impossible");
-	}
-      if (NLMSG_OK(nl->last_hdr, nl->last_size))
-	{
-	  struct nlmsghdr *h = nl->last_hdr;
-	  nl->last_hdr = NLMSG_NEXT(h, nl->last_size);
-	  if (h->nlmsg_seq != nl->seq)
-	    {
-	      log(L_WARN "nl_get_reply: Ignoring out of sequence netlink packet (%x != %x)",
-		  h->nlmsg_seq, nl->seq);
-	      continue;
-	    }
-	  return h;
-	}
-      if (nl->last_size)
-	log(L_WARN "nl_get_reply: Found packet remnant of size %d", nl->last_size);
-      nl->last_hdr = NULL;
-    }
-}
-
-static struct rate_limit rl_netlink_err;
-
-static int
-nl_error(struct nlmsghdr *h)
-{
-  struct nlmsgerr *e;
-  int ec;
-
-  if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
-    {
-      log(L_WARN "Netlink: Truncated error message received");
-      return ENOBUFS;
-    }
-  e = (struct nlmsgerr *) NLMSG_DATA(h);
-  ec = -e->error;
-  if (ec)
-    log_rl(&rl_netlink_err, L_WARN "Netlink: %s", strerror(ec));
-  return ec;
-}
-
-static struct nlmsghdr *
-nl_get_scan(void)
-{
-  struct nlmsghdr *h = nl_get_reply(&nl_scan);
-
-  if (h->nlmsg_type == NLMSG_DONE)
-    return NULL;
-  if (h->nlmsg_type == NLMSG_ERROR)
-    {
-      nl_error(h);
-      return NULL;
-    }
-  return h;
-}
-
-static int
-nl_exchange(struct nlmsghdr *pkt)
-{
-  struct nlmsghdr *h;
-
-  nl_send(&nl_req, pkt);
-  for(;;)
-    {
-      h = nl_get_reply(&nl_req);
-      if (h->nlmsg_type == NLMSG_ERROR)
-	break;
-      log(L_WARN "nl_exchange: Unexpected reply received");
-    }
-  return nl_error(h) ? -1 : 0;
-}
-
-/*
- *	Netlink attributes
- */
-
-static int nl_attr_len;
-
-static void *
-nl_checkin(struct nlmsghdr *h, int lsize)
-{
-  nl_attr_len = h->nlmsg_len - NLMSG_LENGTH(lsize);
-  if (nl_attr_len < 0)
-    {
-      log(L_ERR "nl_checkin: underrun by %d bytes", -nl_attr_len);
-      return NULL;
-    }
-  return NLMSG_DATA(h);
-}
-
-static int
-nl_parse_attrs(struct rtattr *a, struct rtattr **k, int ksize)
-{
-  int max = ksize / sizeof(struct rtattr *);
-  bzero(k, ksize);
-  while (RTA_OK(a, nl_attr_len))
-    {
-      if (a->rta_type < max)
-	k[a->rta_type] = a;
-      a = RTA_NEXT(a, nl_attr_len);
-    }
-  if (nl_attr_len)
-    {
-      log(L_ERR "nl_parse_attrs: remnant of size %d", nl_attr_len);
-      return 0;
-    }
-  else
-    return 1;
-}
-
-void
-nl_add_attr(struct nlmsghdr *h, unsigned bufsize, unsigned code,
-	    void *data, unsigned dlen)
-{
-  unsigned len = RTA_LENGTH(dlen);
-  unsigned pos = NLMSG_ALIGN(h->nlmsg_len);
-  struct rtattr *a;
-
-  if (pos + len > bufsize)
-    bug("nl_add_attr: packet buffer overflow");
-  a = (struct rtattr *)((char *)h + pos);
-  a->rta_type = code;
-  a->rta_len = len;
-  h->nlmsg_len = pos + len;
-  memcpy(RTA_DATA(a), data, dlen);
-}
-
-static inline void
-nl_add_attr_u32(struct nlmsghdr *h, unsigned bufsize, int code, u32 data)
-{
-  nl_add_attr(h, bufsize, code, &data, 4);
-}
-
-static inline void
-nl_add_attr_ipa(struct nlmsghdr *h, unsigned bufsize, int code, ip_addr ipa)
-{
-  ipa_hton(ipa);
-  nl_add_attr(h, bufsize, code, &ipa, sizeof(ipa));
-}
-
-#define RTNH_SIZE (sizeof(struct rtnexthop) + sizeof(struct rtattr) + sizeof(ip_addr))
-
-static inline void
-add_mpnexthop(char *buf, ip_addr ipa, unsigned iface, unsigned char weight)
-{
-  struct rtnexthop *nh = (void *) buf;
-  struct rtattr *rt = (void *) (buf + sizeof(*nh));
-  nh->rtnh_len = RTNH_SIZE;
-  nh->rtnh_flags = 0;
-  nh->rtnh_hops = weight;
-  nh->rtnh_ifindex = iface;
-  rt->rta_len = sizeof(*rt) + sizeof(ipa);
-  rt->rta_type = RTA_GATEWAY;
-  ipa_hton(ipa);
-  memcpy(buf + sizeof(*nh) + sizeof(*rt), &ipa, sizeof(ipa));
-}
-
-
-static void
-nl_add_multipath(struct nlmsghdr *h, unsigned bufsize, struct mpnh *nh)
-{
-  unsigned len = sizeof(struct rtattr);
-  unsigned pos = NLMSG_ALIGN(h->nlmsg_len);
-  char *buf = (char *)h + pos;
-  struct rtattr *rt = (void *) buf;
-  buf += len;
-  
-  for (; nh; nh = nh->next)
-    {
-      len += RTNH_SIZE;
-      if (pos + len > bufsize)
-	bug("nl_add_multipath: packet buffer overflow");
-
-      add_mpnexthop(buf, nh->gw, nh->iface->index, nh->weight);
-      buf += RTNH_SIZE;
-    }
-
-  rt->rta_type = RTA_MULTIPATH;
-  rt->rta_len = len;
-  h->nlmsg_len = pos + len;
-}
-
-
-static struct mpnh *
-nl_parse_multipath(struct krt_proto *p, struct rtattr *ra)
-{
-  /* Temporary buffer for multicast nexthops */
-  static struct mpnh *nh_buffer;
-  static int nh_buf_size;	/* in number of structures */
-  static int nh_buf_used;
-
-  struct rtattr *a[RTA_CACHEINFO+1];
-  struct rtnexthop *nh = RTA_DATA(ra);
-  struct mpnh *rv, *first, **last;
-  int len = RTA_PAYLOAD(ra);
-
-  first = NULL;
-  last = &first;
-  nh_buf_used = 0;
-
-  while (len)
-    {
-      /* Use RTNH_OK(nh,len) ?? */
-      if ((len < sizeof(*nh)) || (len < nh->rtnh_len))
-	return NULL;
-
-      if (nh_buf_used == nh_buf_size)
-      {
-	nh_buf_size = nh_buf_size ? (nh_buf_size * 2) : 4;
-	nh_buffer = xrealloc(nh_buffer, nh_buf_size * sizeof(struct mpnh));
-      }
-      *last = rv = nh_buffer + nh_buf_used++;
-      rv->next = NULL;
-      last = &(rv->next);
-
-      rv->weight = nh->rtnh_hops;
-      rv->iface = if_find_by_index(nh->rtnh_ifindex);
-      if (!rv->iface)
-	return NULL;
-
-      /* Nonexistent RTNH_PAYLOAD ?? */
-      nl_attr_len = nh->rtnh_len - RTNH_LENGTH(0);
-      nl_parse_attrs(RTNH_DATA(nh), a, sizeof(a));
-      if (a[RTA_GATEWAY])
-	{
-	  if (RTA_PAYLOAD(a[RTA_GATEWAY]) != sizeof(ip_addr))
-	    return NULL;
-
-	  memcpy(&rv->gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ip_addr));
-	  ipa_ntoh(rv->gw);
-
-	  neighbor *ng = neigh_find2(&p->p, &rv->gw, rv->iface,
-				     (nh->rtnh_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0);
-	  if (!ng || (ng->scope == SCOPE_HOST))
-	    return NULL;
-	}
-      else
-	return NULL;
-
-      len -= NLMSG_ALIGN(nh->rtnh_len);
-      nh = RTNH_NEXT(nh);
-    }
-
-  return first;
-}
-
-
-/*
- *	Scanning of interfaces
- */
-
-static void
-nl_parse_link(struct nlmsghdr *h, int scan)
-{
-  struct ifinfomsg *i;
-  struct rtattr *a[IFLA_WIRELESS+1];
-  int new = h->nlmsg_type == RTM_NEWLINK;
-  struct iface f = {};
-  struct iface *ifi;
-  char *name;
-  u32 mtu;
-  unsigned int fl;
-
-  if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFLA_RTA(i), a, sizeof(a)))
-    return;
-  if (!a[IFLA_IFNAME] || RTA_PAYLOAD(a[IFLA_IFNAME]) < 2 ||
-      !a[IFLA_MTU] || RTA_PAYLOAD(a[IFLA_MTU]) != 4)
-    {
-      if (scan || !a[IFLA_WIRELESS])
-        log(L_ERR "nl_parse_link: Malformed message received");
-      return;
-    }
-  name = RTA_DATA(a[IFLA_IFNAME]);
-  memcpy(&mtu, RTA_DATA(a[IFLA_MTU]), sizeof(u32));
-
-  ifi = if_find_by_index(i->ifi_index);
-  if (!new)
-    {
-      DBG("KIF: IF%d(%s) goes down\n", i->ifi_index, name);
-      if (!ifi)
-	return;
-
-      if_delete(ifi);
-    }
-  else
-    {
-      DBG("KIF: IF%d(%s) goes up (mtu=%d,flg=%x)\n", i->ifi_index, name, mtu, i->ifi_flags);
-      if (ifi && strncmp(ifi->name, name, sizeof(ifi->name)-1))
-	if_delete(ifi);
-
-      strncpy(f.name, name, sizeof(f.name)-1);
-      f.index = i->ifi_index;
-      f.mtu = mtu;
-
-      fl = i->ifi_flags;
-      if (fl & IFF_UP)
-	f.flags |= IF_ADMIN_UP;
-      if (fl & IFF_LOWER_UP)
-	f.flags |= IF_LINK_UP;
-      if (fl & IFF_LOOPBACK)		/* Loopback */
-	f.flags |= IF_MULTIACCESS | IF_LOOPBACK | IF_IGNORE;
-      else if (fl & IFF_POINTOPOINT)	/* PtP */
-	f.flags |= IF_MULTICAST;
-      else if (fl & IFF_BROADCAST)	/* Broadcast */
-	f.flags |= IF_MULTIACCESS | IF_BROADCAST | IF_MULTICAST;
-      else
-	f.flags |= IF_MULTIACCESS;	/* NBMA */
-      if_update(&f);
-    }
-}
-
-static void
-nl_parse_addr(struct nlmsghdr *h)
-{
-  struct ifaddrmsg *i;
-  struct rtattr *a[IFA_ANYCAST+1];
-  int new = h->nlmsg_type == RTM_NEWADDR;
-  struct ifa ifa;
-  struct iface *ifi;
-  int scope;
-
-  if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(IFA_RTA(i), a, sizeof(a)))
-    return;
-  if (i->ifa_family != BIRD_AF)
-    return;
-  if (!a[IFA_ADDRESS] || RTA_PAYLOAD(a[IFA_ADDRESS]) != sizeof(ip_addr)
-#ifdef IPV6
-      || a[IFA_LOCAL] && RTA_PAYLOAD(a[IFA_LOCAL]) != sizeof(ip_addr)
-#else
-      || !a[IFA_LOCAL] || RTA_PAYLOAD(a[IFA_LOCAL]) != sizeof(ip_addr)
-      || (a[IFA_BROADCAST] && RTA_PAYLOAD(a[IFA_BROADCAST]) != sizeof(ip_addr))
-#endif
-      )
-    {
-      log(L_ERR "nl_parse_addr: Malformed message received");
-      return;
-    }
-
-  ifi = if_find_by_index(i->ifa_index);
-  if (!ifi)
-    {
-      log(L_ERR "KIF: Received address message for unknown interface %d", i->ifa_index);
-      return;
-    }
-
-  bzero(&ifa, sizeof(ifa));
-  ifa.iface = ifi;
-  if (i->ifa_flags & IFA_F_SECONDARY)
-    ifa.flags |= IA_SECONDARY;
-
-  /* IFA_LOCAL can be unset for IPv6 interfaces */
-  memcpy(&ifa.ip, RTA_DATA(a[IFA_LOCAL] ? : a[IFA_ADDRESS]), sizeof(ifa.ip));
-  ipa_ntoh(ifa.ip);
-  ifa.pxlen = i->ifa_prefixlen;
-  if (i->ifa_prefixlen > BITS_PER_IP_ADDRESS)
-    {
-      log(L_ERR "KIF: Invalid prefix length for interface %s: %d", ifi->name, i->ifa_prefixlen);
-      new = 0;
-    }
-  if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS)
-    {
-      ip_addr addr;
-      memcpy(&addr, RTA_DATA(a[IFA_ADDRESS]), sizeof(addr));
-      ipa_ntoh(addr);
-      ifa.prefix = ifa.brd = addr;
-
-      /* It is either a host address or a peer address */
-      if (ipa_equal(ifa.ip, addr))
-	ifa.flags |= IA_HOST;
-      else
-	{
-	  ifa.flags |= IA_PEER;
-	  ifa.opposite = addr;
-	}
-    }
-  else
-    {
-      ip_addr netmask = ipa_mkmask(ifa.pxlen);
-      ifa.prefix = ipa_and(ifa.ip, netmask);
-      ifa.brd = ipa_or(ifa.ip, ipa_not(netmask));
-      if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 1)
-	ifa.opposite = ipa_opposite_m1(ifa.ip);
-
-#ifndef IPV6
-      if (i->ifa_prefixlen == BITS_PER_IP_ADDRESS - 2)
-	ifa.opposite = ipa_opposite_m2(ifa.ip);
-
-      if ((ifi->flags & IF_BROADCAST) && a[IFA_BROADCAST])
-	{
-	  ip_addr xbrd;
-	  memcpy(&xbrd, RTA_DATA(a[IFA_BROADCAST]), sizeof(xbrd));
-	  ipa_ntoh(xbrd);
-	  if (ipa_equal(xbrd, ifa.prefix) || ipa_equal(xbrd, ifa.brd))
-	    ifa.brd = xbrd;
-	  else if (ifi->flags & IF_TMP_DOWN) /* Complain only during the first scan */
-	    log(L_ERR "KIF: Invalid broadcast address %I for %s", xbrd, ifi->name);
-	}
-#endif
-    }
-
-  scope = ipa_classify(ifa.ip);
-  if (scope < 0)
-    {
-      log(L_ERR "KIF: Invalid interface address %I for %s", ifa.ip, ifi->name);
-      return;
-    }
-  ifa.scope = scope & IADDR_SCOPE_MASK;
-
-  DBG("KIF: IF%d(%s): %s IPA %I, flg %x, net %I/%d, brd %I, opp %I\n",
-      ifi->index, ifi->name,
-      new ? "added" : "removed",
-      ifa.ip, ifa.flags, ifa.prefix, ifa.pxlen, ifa.brd, ifa.opposite);
-  if (new)
-    ifa_update(&ifa);
-  else
-    ifa_delete(&ifa);
-}
-
-void
-kif_do_scan(struct kif_proto *p UNUSED)
-{
-  struct nlmsghdr *h;
-
-  if_start_update();
-
-  nl_request_dump(RTM_GETLINK);
-  while (h = nl_get_scan())
-    if (h->nlmsg_type == RTM_NEWLINK || h->nlmsg_type == RTM_DELLINK)
-      nl_parse_link(h, 1);
-    else
-      log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
-
-  nl_request_dump(RTM_GETADDR);
-  while (h = nl_get_scan())
-    if (h->nlmsg_type == RTM_NEWADDR || h->nlmsg_type == RTM_DELADDR)
-      nl_parse_addr(h);
-    else
-      log(L_DEBUG "nl_scan_ifaces: Unknown packet received (type=%d)", h->nlmsg_type);
-
-  if_end_update();
-}
-
-/*
- *	Routes
- */
-
-static struct krt_proto *nl_table_map[NL_NUM_TABLES];
-
-int
-krt_capable(rte *e)
-{
-  rta *a = e->attrs;
-
-  if (a->cast != RTC_UNICAST)
-    return 0;
-
-  switch (a->dest)
-    {
-    case RTD_ROUTER:
-    case RTD_DEVICE:
-      if (a->iface == NULL)
-	return 0;
-    case RTD_BLACKHOLE:
-    case RTD_UNREACHABLE:
-    case RTD_PROHIBIT:
-    case RTD_MULTIPATH:
-      break;
-    default:
-      return 0;
-    }
-  return 1;
-}
-
-static inline int
-nh_bufsize(struct mpnh *nh)
-{
-  int rv = 0;
-  for (; nh != NULL; nh = nh->next)
-    rv += RTNH_SIZE;
-  return rv;
-}
-
-static int
-nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int new)
-{
-  eattr *ea;
-  net *net = e->net;
-  rta *a = e->attrs;
-  struct {
-    struct nlmsghdr h;
-    struct rtmsg r;
-    char buf[128 + nh_bufsize(a->nexthops)];
-  } r;
-
-  DBG("nl_send_route(%I/%d,new=%d)\n", net->n.prefix, net->n.pxlen, new);
-
-  bzero(&r.h, sizeof(r.h));
-  bzero(&r.r, sizeof(r.r));
-  r.h.nlmsg_type = new ? RTM_NEWROUTE : RTM_DELROUTE;
-  r.h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
-  r.h.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | (new ? NLM_F_CREATE|NLM_F_EXCL : 0);
-
-  r.r.rtm_family = BIRD_AF;
-  r.r.rtm_dst_len = net->n.pxlen;
-  r.r.rtm_tos = 0;
-  r.r.rtm_table = KRT_CF->sys.table_id;
-  r.r.rtm_protocol = RTPROT_BIRD;
-  r.r.rtm_scope = RT_SCOPE_UNIVERSE;
-  nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix);
-
-  u32 metric = 0;
-  if (new && e->attrs->source == RTS_INHERIT)
-    metric = e->u.krt.metric;
-  if (ea = ea_find(eattrs, EA_KRT_METRIC))
-    metric = ea->u.data;
-  if (metric != 0)
-    nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, metric);
-
-  if (ea = ea_find(eattrs, EA_KRT_PREFSRC))
-    nl_add_attr_ipa(&r.h, sizeof(r), RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data);
-
-  if (ea = ea_find(eattrs, EA_KRT_REALM))
-    nl_add_attr_u32(&r.h, sizeof(r), RTA_FLOW, ea->u.data);
-
-  /* a->iface != NULL checked in krt_capable() for router and device routes */
-
-  switch (a->dest)
-    {
-    case RTD_ROUTER:
-      r.r.rtm_type = RTN_UNICAST;
-      nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index);
-      nl_add_attr_ipa(&r.h, sizeof(r), RTA_GATEWAY, a->gw);
-      break;
-    case RTD_DEVICE:
-      r.r.rtm_type = RTN_UNICAST;
-      nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index);
-      break;
-    case RTD_BLACKHOLE:
-      r.r.rtm_type = RTN_BLACKHOLE;
-      break;
-    case RTD_UNREACHABLE:
-      r.r.rtm_type = RTN_UNREACHABLE;
-      break;
-    case RTD_PROHIBIT:
-      r.r.rtm_type = RTN_PROHIBIT;
-      break;
-    case RTD_MULTIPATH:
-      r.r.rtm_type = RTN_UNICAST;
-      nl_add_multipath(&r.h, sizeof(r), a->nexthops);
-      break;
-    default:
-      bug("krt_capable inconsistent with nl_send_route");
-    }
-
-  return nl_exchange(&r.h);
-}
-
-void
-krt_do_notify(struct krt_proto *p, net *n, rte *new, rte *old, struct ea_list *eattrs)
-{
-  int err = 0;
-
-  /*
-   * NULL for eattr of the old route is a little hack, but we don't
-   * get proper eattrs for old in rt_notify() anyway. NULL means no
-   * extended route attributes and therefore matches if the kernel
-   * route has any of them.
-   */
-
-  if (old)
-    nl_send_route(p, old, NULL, 0);
-
-  if (new)
-    err = nl_send_route(p, new, eattrs, 1);
-
-  if (err < 0)
-    n->n.flags |= KRF_SYNC_ERROR;
-  else
-    n->n.flags &= ~KRF_SYNC_ERROR;
-}
-
-
-#define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0)
-
-static void
-nl_parse_route(struct nlmsghdr *h, int scan)
-{
-  struct krt_proto *p;
-  struct rtmsg *i;
-  struct rtattr *a[RTA_CACHEINFO+1];
-  int new = h->nlmsg_type == RTM_NEWROUTE;
-
-  ip_addr dst = IPA_NONE;
-  u32 oif = ~0;
-  int src;
-
-  if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(RTM_RTA(i), a, sizeof(a)))
-    return;
-  if (i->rtm_family != BIRD_AF)
-    return;
-  if ((a[RTA_DST] && RTA_PAYLOAD(a[RTA_DST]) != sizeof(ip_addr)) ||
-#ifdef IPV6
-      (a[RTA_IIF] && RTA_PAYLOAD(a[RTA_IIF]) != 4) ||
-#endif
-      (a[RTA_OIF] && RTA_PAYLOAD(a[RTA_OIF]) != 4) ||
-      (a[RTA_GATEWAY] && RTA_PAYLOAD(a[RTA_GATEWAY]) != sizeof(ip_addr)) ||
-      (a[RTA_PRIORITY] && RTA_PAYLOAD(a[RTA_PRIORITY]) != 4) ||
-      (a[RTA_PREFSRC] && RTA_PAYLOAD(a[RTA_PREFSRC]) != sizeof(ip_addr)) ||
-      (a[RTA_FLOW] && RTA_PAYLOAD(a[RTA_OIF]) != 4))
-    {
-      log(L_ERR "KRT: Malformed message received");
-      return;
-    }
-
-  if (a[RTA_DST])
-    {
-      memcpy(&dst, RTA_DATA(a[RTA_DST]), sizeof(dst));
-      ipa_ntoh(dst);
-    }
-
-  if (a[RTA_OIF])
-    memcpy(&oif, RTA_DATA(a[RTA_OIF]), sizeof(oif));
-
-  p = nl_table_map[i->rtm_table];	/* Do we know this table? */
-  DBG("KRT: Got %I/%d, type=%d, oif=%d, table=%d, prid=%d, proto=%s\n", dst, i->rtm_dst_len, i->rtm_type, oif, i->rtm_table, i->rtm_protocol, p ? p->p.name : "(none)");
-  if (!p)
-    SKIP("unknown table %d\n", i->rtm_table);
-
-
-#ifdef IPV6
-  if (a[RTA_IIF])
-    SKIP("IIF set\n");
-#else
-  if (i->rtm_tos != 0)			/* We don't support TOS */
-    SKIP("TOS %02x\n", i->rtm_tos);
-#endif
-
-  if (scan && !new)
-    SKIP("RTM_DELROUTE in scan\n");
-
-  int c = ipa_classify_net(dst);
-  if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK))
-    SKIP("strange class/scope\n");
-
-  // ignore rtm_scope, it is not a real scope
-  // if (i->rtm_scope != RT_SCOPE_UNIVERSE)
-  //   SKIP("scope %u\n", i->rtm_scope);
-
-  switch (i->rtm_protocol)
-    {
-    case RTPROT_UNSPEC:
-      SKIP("proto unspec\n");
-
-    case RTPROT_REDIRECT:
-      src = KRT_SRC_REDIRECT;
-      break;
-
-    case RTPROT_KERNEL:
-      src = KRT_SRC_KERNEL;
-      return;
-
-    case RTPROT_BIRD:
-      if (!scan)
-	SKIP("echo\n");
-      src = KRT_SRC_BIRD;
-      break;
-
-    case RTPROT_BOOT:
-    default:
-      src = KRT_SRC_ALIEN;
-    }
-
-  net *net = net_get(p->p.table, dst, i->rtm_dst_len);
-
-  rta ra = {
-    .proto = &p->p,
-    .source = RTS_INHERIT,
-    .scope = SCOPE_UNIVERSE,
-    .cast = RTC_UNICAST
-  };
-
-  switch (i->rtm_type)
-    {
-    case RTN_UNICAST:
-
-      if (a[RTA_MULTIPATH])
-	{
-	  ra.dest = RTD_MULTIPATH;
-	  ra.nexthops = nl_parse_multipath(p, a[RTA_MULTIPATH]);
-	  if (!ra.nexthops)
-	    {
-	      log(L_ERR "KRT: Received strange multipath route %I/%d",
-		  net->n.prefix, net->n.pxlen);
-	      return;
-	    }
-	    
-	  break;
-	}
-
-      ra.iface = if_find_by_index(oif);
-      if (!ra.iface)
-	{
-	  log(L_ERR "KRT: Received route %I/%d with unknown ifindex %u",
-	      net->n.prefix, net->n.pxlen, oif);
-	  return;
-	}
-
-      if (a[RTA_GATEWAY])
-	{
-	  neighbor *ng;
-	  ra.dest = RTD_ROUTER;
-	  memcpy(&ra.gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ra.gw));
-	  ipa_ntoh(ra.gw);
-
-	  /* Silently skip strange 6to4 routes */
-	  if (ipa_in_net(ra.gw, IPA_NONE, 96))
-	    return;
-
-	  ng = neigh_find2(&p->p, &ra.gw, ra.iface,
-			   (i->rtm_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0);
-	  if (!ng || (ng->scope == SCOPE_HOST))
-	    {
-	      log(L_ERR "KRT: Received route %I/%d with strange next-hop %I",
-		  net->n.prefix, net->n.pxlen, ra.gw);
-	      return;
-	    }
-	}
-      else
-	{
-	  ra.dest = RTD_DEVICE;
-
-	  /*
-	   * In Linux IPv6, 'native' device routes have proto
-	   * RTPROT_BOOT and not RTPROT_KERNEL (which they have in
-	   * IPv4 and which is expected). We cannot distinguish
-	   * 'native' and user defined device routes, so we ignore all
-	   * such device routes and for consistency, we have the same
-	   * behavior in IPv4. Anyway, users should use RTPROT_STATIC
-	   * for their 'alien' routes.
-	   */
-
-	  if (i->rtm_protocol == RTPROT_BOOT)
-	    src = KRT_SRC_KERNEL;
-	}
-
-      break;
-    case RTN_BLACKHOLE:
-      ra.dest = RTD_BLACKHOLE;
-      break;
-    case RTN_UNREACHABLE:
-      ra.dest = RTD_UNREACHABLE;
-      break;
-    case RTN_PROHIBIT:
-      ra.dest = RTD_PROHIBIT;
-      break;
-    /* FIXME: What about RTN_THROW? */
-    default:
-      SKIP("type %d\n", i->rtm_type);
-      return;
-    }
-
-  rte *e = rte_get_temp(&ra);
-  e->net = net;
-  e->u.krt.src = src;
-  e->u.krt.proto = i->rtm_protocol;
-  e->u.krt.type = i->rtm_type;
-
-  if (a[RTA_PRIORITY])
-    memcpy(&e->u.krt.metric, RTA_DATA(a[RTA_PRIORITY]), sizeof(e->u.krt.metric)); 
-  else
-    e->u.krt.metric = 0;
-
-  if (a[RTA_PREFSRC])
-    {
-      ip_addr ps;
-      memcpy(&ps, RTA_DATA(a[RTA_PREFSRC]), sizeof(ps));
-      ipa_ntoh(ps);
-
-      ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr));
-      ea->next = ra.eattrs;
-      ra.eattrs = ea;
-      ea->flags = EALF_SORTED;
-      ea->count = 1;
-      ea->attrs[0].id = EA_KRT_PREFSRC;
-      ea->attrs[0].flags = 0;
-      ea->attrs[0].type = EAF_TYPE_IP_ADDRESS;
-      ea->attrs[0].u.ptr = alloca(sizeof(struct adata) + sizeof(ps));
-      ea->attrs[0].u.ptr->length = sizeof(ps);
-      memcpy(ea->attrs[0].u.ptr->data, &ps, sizeof(ps));
-    }
-
-  if (a[RTA_FLOW])
-    {
-      ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr));
-      ea->next = ra.eattrs;
-      ra.eattrs = ea;
-      ea->flags = EALF_SORTED;
-      ea->count = 1;
-      ea->attrs[0].id = EA_KRT_REALM;
-      ea->attrs[0].flags = 0;
-      ea->attrs[0].type = EAF_TYPE_INT;
-      memcpy(&ea->attrs[0].u.data, RTA_DATA(a[RTA_FLOW]), 4);
-    }
-
-  if (scan)
-    krt_got_route(p, e);
-  else
-    krt_got_route_async(p, e, new);
-}
-
-void
-krt_do_scan(struct krt_proto *p UNUSED)	/* CONFIG_ALL_TABLES_AT_ONCE => p is NULL */
-{
-  struct nlmsghdr *h;
-
-  nl_request_dump(RTM_GETROUTE);
-  while (h = nl_get_scan())
-    if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
-      nl_parse_route(h, 1);
-    else
-      log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
-}
-
-/*
- *	Asynchronous Netlink interface
- */
-
-static sock *nl_async_sk;		/* BIRD socket for asynchronous notifications */
-static byte *nl_async_rx_buffer;	/* Receive buffer */
-
-static void
-nl_async_msg(struct nlmsghdr *h)
-{
-  switch (h->nlmsg_type)
-    {
-    case RTM_NEWROUTE:
-    case RTM_DELROUTE:
-      DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type);
-      nl_parse_route(h, 0);
-      break;
-    case RTM_NEWLINK:
-    case RTM_DELLINK:
-      DBG("KRT: Received async link notification (%d)\n", h->nlmsg_type);
-      nl_parse_link(h, 0);
-      break;
-    case RTM_NEWADDR:
-    case RTM_DELADDR:
-      DBG("KRT: Received async address notification (%d)\n", h->nlmsg_type);
-      nl_parse_addr(h);
-      break;
-    default:
-      DBG("KRT: Received unknown async notification (%d)\n", h->nlmsg_type);
-    }
-}
-
-static int
-nl_async_hook(sock *sk, int size UNUSED)
-{
-  struct iovec iov = { nl_async_rx_buffer, NL_RX_SIZE };
-  struct sockaddr_nl sa;
-  struct msghdr m = { (struct sockaddr *) &sa, sizeof(sa), &iov, 1, NULL, 0, 0 };
-  struct nlmsghdr *h;
-  int x;
-  unsigned int len;
-
-  x = recvmsg(sk->fd, &m, 0);
-  if (x < 0)
-    {
-      if (errno == ENOBUFS)
-	{
-	  /*
-	   *  Netlink reports some packets have been thrown away.
-	   *  One day we might react to it by asking for route table
-	   *  scan in near future.
-	   */
-	  return 1;	/* More data are likely to be ready */
-	}
-      else if (errno != EWOULDBLOCK)
-	log(L_ERR "Netlink recvmsg: %m");
-      return 0;
-    }
-  if (sa.nl_pid)		/* It isn't from the kernel */
-    {
-      DBG("Non-kernel packet\n");
-      return 1;
-    }
-  h = (void *) nl_async_rx_buffer;
-  len = x;
-  if (m.msg_flags & MSG_TRUNC)
-    {
-      log(L_WARN "Netlink got truncated asynchronous message");
-      return 1;
-    }
-  while (NLMSG_OK(h, len))
-    {
-      nl_async_msg(h);
-      h = NLMSG_NEXT(h, len);
-    }
-  if (len)
-    log(L_WARN "nl_async_hook: Found packet remnant of size %d", len);
-  return 1;
-}
-
-static void
-nl_open_async(void)
-{
-  sock *sk;
-  struct sockaddr_nl sa;
-  int fd;
-  static int nl_open_tried = 0;
-
-  if (nl_open_tried)
-    return;
-  nl_open_tried = 1;
-
-  DBG("KRT: Opening async netlink socket\n");
-
-  fd = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
-  if (fd < 0)
-    {
-      log(L_ERR "Unable to open asynchronous rtnetlink socket: %m");
-      return;
-    }
-
-  bzero(&sa, sizeof(sa));
-  sa.nl_family = AF_NETLINK;
-#ifdef IPV6
-  sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV6_IFADDR | RTMGRP_IPV6_ROUTE;
-#else
-  sa.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV4_ROUTE;
-#endif
-  if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) < 0)
-    {
-      log(L_ERR "Unable to bind asynchronous rtnetlink socket: %m");
-      return;
-    }
-
-  sk = nl_async_sk = sk_new(krt_pool);
-  sk->type = SK_MAGIC;
-  sk->rx_hook = nl_async_hook;
-  sk->fd = fd;
-  if (sk_open(sk))
-    bug("Netlink: sk_open failed");
-
-  if (!nl_async_rx_buffer)
-    nl_async_rx_buffer = xmalloc(NL_RX_SIZE);
-}
-
-/*
- *	Interface to the UNIX krt module
- */
-
-static u8 nl_cf_table[(NL_NUM_TABLES+7) / 8];
-
-void
-krt_sys_start(struct krt_proto *p, int first)
-{
-  nl_table_map[KRT_CF->sys.table_id] = p;
-  if (first)
-    {
-      nl_open();
-      nl_open_async();
-    }
-}
-
-void
-krt_sys_shutdown(struct krt_proto *p UNUSED, int last UNUSED)
-{
-}
-
-int
-krt_sys_reconfigure(struct krt_proto *p UNUSED, struct krt_config *n, struct krt_config *o)
-{
-  return n->sys.table_id == o->sys.table_id;
-}
-
-
-void
-krt_sys_preconfig(struct config *c UNUSED)
-{
-  bzero(&nl_cf_table, sizeof(nl_cf_table));
-}
-
-void
-krt_sys_postconfig(struct krt_config *x)
-{
-  int id = x->sys.table_id;
-
-  if (nl_cf_table[id/8] & (1 << (id%8)))
-    cf_error("Multiple kernel syncers defined for table #%d", id);
-  nl_cf_table[id/8] |= (1 << (id%8));
-}
-
-void
-krt_sys_init_config(struct krt_config *cf)
-{
-  cf->sys.table_id = RT_TABLE_MAIN;
-}
-
-void
-krt_sys_copy_config(struct krt_config *d, struct krt_config *s)
-{
-  d->sys.table_id = s->sys.table_id;
-}
-
-
-
-void
-kif_sys_start(struct kif_proto *p UNUSED)
-{
-  nl_open();
-  nl_open_async();
-}
-
-void
-kif_sys_shutdown(struct kif_proto *p UNUSED)
-{
-}