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1567edea8d
Here is a patch fixing a bug that causes breakage of a local routing table during shutdown of Bird. The problem was caused by shutdown of 'device' protocol before shutdown of 'kernel' protocol. When 'device' protocol went down, the route (with local network prefix) From different protocol (BGP or OSPF) became preferred and installed to the kernel routing table. Such routes were broken (like 192.168.1.0/24 via 192.168.1.2). I think it is also the cause of problem reported by Martin Kraus. The patch disables updating of kernel routing table during shutdown of Bird. I am not sure whether this is the best way to fix it, I would prefer to forbid 'kernel' protocol to overwrite routes with 'proto kernel'. The patch also fixes a problem that during shutdown sometimes routes created by Bird remained in the kernel routing table.
112 lines
2.2 KiB
C
112 lines
2.2 KiB
C
/*
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* BIRD -- Unix Routing Table Syncing
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*
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/ioctl.h>
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#include <net/route.h>
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#undef LOCAL_DEBUG
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "nest/route.h"
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#include "nest/protocol.h"
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#include "lib/unix.h"
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#include "lib/krt.h"
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#include "lib/string.h"
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int
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krt_capable(rte *e)
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{
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rta *a = e->attrs;
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#ifdef CONFIG_AUTO_ROUTES
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if (a->source == RTS_DEVICE)
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return 0;
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#endif
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return
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a->cast == RTC_UNICAST &&
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(a->dest == RTD_ROUTER
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|| a->dest == RTD_DEVICE
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#ifdef RTF_REJECT
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|| a->dest == RTD_UNREACHABLE
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#endif
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);
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}
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static void
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krt_ioctl(int ioc, rte *e, char *name)
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{
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net *net = e->net;
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struct rtentry re;
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rta *a = e->attrs;
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bzero(&re, sizeof(re));
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fill_in_sockaddr((struct sockaddr_in *) &re.rt_dst, net->n.prefix, 0);
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fill_in_sockaddr((struct sockaddr_in *) &re.rt_genmask, ipa_mkmask(net->n.pxlen), 0);
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re.rt_flags = RTF_UP;
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if (net->n.pxlen == 32)
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re.rt_flags |= RTF_HOST;
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switch (a->dest)
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{
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case RTD_ROUTER:
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fill_in_sockaddr((struct sockaddr_in *) &re.rt_gateway, a->gw, 0);
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re.rt_flags |= RTF_GATEWAY;
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break;
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case RTD_DEVICE:
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if (!a->iface)
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return;
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re.rt_dev = a->iface->name;
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break;
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#ifdef RTF_REJECT
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case RTD_UNREACHABLE:
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re.rt_flags |= RTF_REJECT;
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break;
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#endif
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default:
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bug("krt set: unknown flags, but not filtered");
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}
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if (ioctl(if_scan_sock, ioc, &re) < 0)
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log(L_ERR "%s(%I/%d): %m", name, net->n.prefix, net->n.pxlen);
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}
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void
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krt_set_notify(struct krt_proto *p, net *net, rte *new, rte *old)
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{
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if (old)
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{
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DBG("krt_remove_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
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krt_ioctl(SIOCDELRT, old, "SIOCDELRT");
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}
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if (new)
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{
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DBG("krt_add_route(%I/%d)\n", net->n.prefix, net->n.pxlen);
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krt_ioctl(SIOCADDRT, new, "SIOCADDRT");
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}
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}
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void
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krt_set_start(struct krt_proto *x, int first)
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{
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if (if_scan_sock < 0)
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bug("krt set: missing socket");
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}
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void
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krt_set_construct(struct krt_config *c)
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{
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}
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void
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krt_set_shutdown(struct krt_proto *x, int last)
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{
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}
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