bird/sysdep/unix/krt-iface.c
Martin Mares 7e5f5ffdda Moved to a much more systematic way of configuring kernel protocols.
o  Nothing is configured automatically. You _need_ to specify
     the kernel syncer in config file in order to get it started.
  o  Syncing has been split to route syncer (protocol "Kernel") and
     interface syncer (protocol "Device"), device routes are generated
     by protocol "Direct" (now can exist in multiple instances, so that
     it will be possible to feed different device routes to different
     routing tables once multiple tables get supported).

See doc/bird.conf.example for a living example of these shiny features.
1999-03-26 21:44:38 +00:00

196 lines
4.4 KiB
C

/*
* BIRD -- Unix Interface Scanning and Syncing
*
* (c) 1998--1999 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <errno.h>
#define LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/route.h"
#include "nest/protocol.h"
#include "lib/timer.h"
#include "lib/krt.h"
#include "unix.h"
int if_scan_sock = -1;
static void
scan_ifs(struct ifreq *r, int cnt)
{
struct iface i;
char *err;
unsigned fl;
ip_addr netmask;
int l;
if_start_update();
for (cnt /= sizeof(struct ifreq); cnt; cnt--, r++)
{
bzero(&i, sizeof(i));
DBG("%s\n", r->ifr_ifrn.ifrn_name);
strncpy(i.name, r->ifr_ifrn.ifrn_name, sizeof(i.name) - 1);
get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &i.ip, NULL);
if (ipa_nonzero(i.ip))
{
l = ipa_classify(i.ip);
if (l < 0 || !(l & IADDR_HOST))
{
log(L_ERR "%s: Invalid interface address", i.name);
i.ip = IPA_NONE;
}
else if ((l & IADDR_SCOPE_MASK) == SCOPE_HOST)
i.flags |= IF_LOOPBACK | IF_IGNORE;
}
if (ioctl(if_scan_sock, SIOCGIFFLAGS, r) < 0)
{
err = "SIOCGIFFLAGS";
faulty:
log(L_ERR "%s(%s): %m", err, i.name);
bad:
i.flags = (i.flags & ~IF_LINK_UP) | IF_ADMIN_DOWN;
continue;
}
fl = r->ifr_flags;
if (fl & IFF_UP)
i.flags |= IF_LINK_UP;
if (ioctl(if_scan_sock, SIOCGIFNETMASK, r) < 0)
{ err = "SIOCGIFNETMASK"; goto faulty; }
get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &netmask, NULL);
l = ipa_mklen(netmask);
if (l < 0 || l == 31)
{
log(L_ERR "%s: Invalid netmask", i.name);
goto bad;
}
i.pxlen = l;
if (fl & IFF_POINTOPOINT)
{
i.flags |= IF_UNNUMBERED;
i.pxlen = BITS_PER_IP_ADDRESS;
if (ioctl(if_scan_sock, SIOCGIFDSTADDR, r) < 0)
{ err = "SIOCGIFDSTADDR"; goto faulty; }
get_sockaddr((struct sockaddr_in *) &r->ifr_addr, &i.opposite, NULL);
}
if (fl & IFF_LOOPBACK)
i.flags |= IF_LOOPBACK | IF_IGNORE;
#ifndef CONFIG_ALL_MULTICAST
if (fl & IFF_MULTICAST)
#endif
i.flags |= IF_MULTICAST;
i.prefix = ipa_and(i.ip, ipa_mkmask(i.pxlen));
if (i.pxlen < 32)
{
i.brd = ipa_or(i.prefix, ipa_not(ipa_mkmask(i.pxlen)));
if (ipa_equal(i.ip, i.prefix) || ipa_equal(i.ip, i.brd))
{
log(L_ERR "%s: Using network or broadcast address for interface", i.name);
goto bad;
}
if (fl & IFF_BROADCAST)
i.flags |= IF_BROADCAST;
if (i.pxlen < 30)
i.flags |= IF_MULTIACCESS;
else
i.opposite = ipa_opposite(i.ip);
}
else
i.brd = i.opposite;
if (ioctl(if_scan_sock, SIOCGIFMTU, r) < 0)
{ err = "SIOCGIFMTU"; goto faulty; }
i.mtu = r->ifr_mtu;
#ifdef SIOCGIFINDEX
if (ioctl(if_scan_sock, SIOCGIFINDEX, r) < 0)
DBG("SIOCGIFINDEX failed: %m\n");
else
i.index = r->ifr_ifindex;
#else
/* FIXME: What else? Guess ifindex (we need it at least for OSPF on unnumbered links)? */
#endif
if_update(&i);
}
if_end_update();
}
void
krt_if_scan(struct kif_proto *p)
{
struct ifconf ic;
static int last_ifbuf_size = 4*sizeof(struct ifreq);
int res;
for(;;)
{
if (last_ifbuf_size)
{
struct ifreq *r = alloca(last_ifbuf_size);
ic.ifc_ifcu.ifcu_req = r;
ic.ifc_len = last_ifbuf_size;
res = ioctl(if_scan_sock, SIOCGIFCONF, &ic);
if (res < 0 && errno != EFAULT)
die("SIOCCGIFCONF: %m");
if (res < last_ifbuf_size)
{
scan_ifs(r, ic.ifc_len);
break;
}
}
#ifdef CLEAN_WAY_WORKING_ONLY_ON_LINUX_2_1 /* FIXME */
ic.ifc_req = NULL;
ic.ifc_len = 999999999;
if (ioctl(if_scan_sock, SIOCGIFCONF, &ic) < 0)
die("SIOCIFCONF: %m");
ic.ifc_len += sizeof(struct ifreq);
if (last_ifbuf_size < ic.ifc_len)
{
last_ifbuf_size = ic.ifc_len;
DBG("Increased ifconf buffer size to %d\n", last_ifbuf_size);
}
#else
last_ifbuf_size *= 2;
DBG("Increased ifconf buffer size to %d\n", last_ifbuf_size);
#endif
}
}
void
krt_if_preconfig(struct kif_config *c)
{
}
void
krt_if_start(struct kif_proto *p)
{
}
void
krt_if_shutdown(struct kif_proto *p)
{
}
void
krt_if_io_init(void)
{
if_scan_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
DBG("Using socket %d for interface and route scanning\n", if_scan_sock);
if (if_scan_sock < 0)
die("Cannot create scanning socket: %m");
}