Basic kernel routing table syncing implemented. Learning of routes installed
by other programs or the kernel itself is not supported yet, but it's not needed for development of other protocols.
This commit is contained in:
Martin Mares
parent
567e6c6220
commit
0804525255
3 changed files with 136 additions and 9 deletions
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@ -26,6 +26,8 @@
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static int krt_scan_fd = -1;
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/* FIXME: Filtering */
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static void
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krt_parse_entry(byte *e)
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{
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@ -98,6 +100,8 @@ krt_parse_entry(byte *e)
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if (!(flags & RTF_GATEWAY)) /* It's a device route */
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return;
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#endif
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DBG("krt_parse_entry: kernel reporting unknown route %I/%d\n", dest, masklen);
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/* FIXME: should be able to learn kernel routes */
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net->n.flags |= KRF_UPDATE;
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}
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}
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@ -108,6 +112,7 @@ krt_scan_proc(void)
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byte buf[32768];
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int l, seen_hdr;
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DBG("Scanning kernel table...\n");
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if (krt_scan_fd < 0)
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{
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krt_scan_fd = open("/proc/net/route", O_RDONLY);
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@ -145,15 +150,48 @@ krt_scan_proc(void)
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return 1;
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}
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static void
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krt_prune(void)
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{
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struct rtable *t = &master_table;
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struct fib_node *f;
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DBG("Pruning routes...\n");
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while (t && t->tos)
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t = t->sibling;
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if (!t)
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return;
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FIB_WALK(&t->fib, f)
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{
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net *n = (net *) f;
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switch (f->flags)
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{
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case KRF_UPDATE:
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DBG("krt_prune: removing %I/%d\n", n->n.prefix, n->n.pxlen);
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krt_remove_route(n, NULL);
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/* Fall-thru */
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case 0:
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if (n->routes)
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{
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DBG("krt_prune: reinstalling %I/%d\n", n->n.prefix, n->n.pxlen);
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krt_add_route(n, n->routes);
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}
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break;
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case KRF_SEEN:
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break;
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default:
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die("krt_prune: invalid route status");
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}
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f->flags = 0;
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}
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FIB_WALK_END;
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}
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static void
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krt_scan_fire(timer *t)
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{
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struct krt_proto *x = t->data;
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SCANOPT;
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DBG("Scanning kernel table...\n");
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if (!krt_scan_proc())
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return;
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if (krt_scan_proc())
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krt_prune();
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}
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void
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@ -185,4 +223,5 @@ krt_scan_shutdown(struct krt_proto *x)
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SCANOPT;
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tm_stop(p->timer);
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/* FIXME: Remove all krt's? */
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}
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@ -10,7 +10,7 @@
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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 <errno.h>
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#include <net/route.h>
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#define LOCAL_DEBUG
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@ -18,18 +18,102 @@
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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/timer.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(net *net, 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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#ifndef CONFIG_AUTO_ROUTES
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|| a->dest == RTD_DEVICE
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#endif
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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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void
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krt_remove_route(net *net, rte *old)
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{
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struct rtentry re;
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if (old && !krt_capable(net, 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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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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if (ioctl(if_scan_sock, SIOCDELRT, &re) < 0)
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log(L_ERR "SIOCDELRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
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}
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void
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krt_add_route(net *net, rte *new)
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{
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struct rtentry re;
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rta *a = new->attrs;
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if (!krt_capable(net, 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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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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#ifndef CONFIG_AUTO_ROUTES
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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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#endif
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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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die("krt set: unknown flags, but not filtered");
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}
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if (ioctl(if_scan_sock, SIOCADDRT, &re) < 0)
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log(L_ERR "SIOCADDRT(%I/%d): %m", net->n.prefix, net->n.pxlen);
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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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DBG("krt_set_notify(%I/%d)\n", net->n.prefix, net->n.pxlen);
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if (x->state != PRS_UP)
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return;
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if (old)
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krt_remove_route(net, old);
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if (new)
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krt_add_route(net, new);
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}
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void
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krt_set_preconfig(struct krt_proto *x)
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{
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if (if_scan_sock < 0)
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die("krt set: missing socket");
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x->p.rt_notify = krt_set_notify;
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}
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@ -12,4 +12,8 @@
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struct krt_set_params {
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};
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void krt_remove_route(net *net, rte *old);
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void krt_add_route(net *net, rte *new);
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int krt_capable(net *net, rte *e);
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#endif
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