2d14045224
The new kernel syncer is cleanly split between generic UNIX module and OS dependent submodules: - krt.c (the generic part) - krt-iface (low-level functions for interface handling) - krt-scan (low-level functions for routing table scanning) - krt-set (low-level functions for setting of kernel routes) krt-set and krt-iface are common for all BSD-like Unices, krt-scan is heavily system dependent (most Unices require /dev/kmem parsing, Linux uses /proc), Netlink substitues all three modules. We expect each UNIX port supports kernel routing table scanning, kernel interface table scanning, kernel route manipulation and possibly also asynchronous event notifications (new route, interface state change; not implemented yet) and build the KRT protocol on the top of these primitive operations.
139 lines
2.7 KiB
C
139 lines
2.7 KiB
C
/*
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* BIRD -- Unix Routing Table Syncing
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*
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* (c) 1998--1999 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 <string.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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#define 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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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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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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!a->tos;
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}
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static inline int
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krt_capable_op(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->dest == RTD_ROUTER && a->source == RTS_DEVICE)
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return 0;
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#endif
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return krt_capable(e);
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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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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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static void
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krt_remove_route(rte *old)
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{
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net *net = old->net;
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if (!krt_capable_op(old))
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{
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DBG("krt_remove_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
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return;
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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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static void
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krt_add_route(rte *new)
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{
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net *net = new->net;
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if (!krt_capable_op(new))
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{
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DBG("krt_add_route(ignored %I/%d)\n", net->n.prefix, net->n.pxlen);
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return;
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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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void
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krt_set_notify(struct proto *x, net *net, rte *new, rte *old)
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{
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if (old)
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krt_remove_route(old);
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if (new)
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krt_add_route(new);
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}
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void
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krt_set_start(struct krt_proto *x)
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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_preconfig(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)
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{
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}
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