diff options
Diffstat (limited to 'sysdep')
| -rw-r--r-- | sysdep/linux/krt-scan.c | 132 |
1 files changed, 131 insertions, 1 deletions
diff --git a/sysdep/linux/krt-scan.c b/sysdep/linux/krt-scan.c index caae54d..efc8e93 100644 --- a/sysdep/linux/krt-scan.c +++ b/sysdep/linux/krt-scan.c @@ -7,23 +7,153 @@ */ #include <string.h> +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <net/route.h> #define LOCAL_DEBUG #include "nest/bird.h" -#include "nest/iface.h" #include "nest/route.h" #include "nest/protocol.h" +#include "nest/iface.h" #include "lib/timer.h" #include "lib/unix.h" #include "lib/krt.h" #define SCANOPT struct krt_scan_params *p = &x->scanopt +static int krt_scan_fd = -1; + +static void +krt_parse_entry(byte *e) +{ + u32 dest0, gw0, mask0; + ip_addr dest, gw, mask; + unsigned int flags; + int masklen; + net *net; + byte *iface = e; + + if (sscanf(e, "%*s\t%x\t%x\t%x\t%*d\t%*d\t%*d\t%x\t", &dest0, &gw0, &flags, &mask0) != 4) + { + log(L_ERR "krt read: unable to parse `%s'", e); + return; + } + while (*e != '\t') + e++; + *e = 0; + + dest = ipa_from_u32(dest0); + ipa_ntoh(dest); + gw = ipa_from_u32(gw0); + ipa_ntoh(gw); + mask = ipa_from_u32(mask0); + ipa_ntoh(mask); + if ((masklen = ipa_mklen(mask)) < 0) + { + log(L_ERR "krt read: invalid netmask %08x", mask0); + return; + } + DBG("Got %I/%d via %I flags %x\n", dest, masklen, gw, flags); + + if (!(flags & RTF_UP)) + return; + if (flags & RTF_HOST) + masklen = 32; + if (flags & (RTF_DYNAMIC | RTF_MODIFIED)) /* Redirect route */ + { + log(L_WARN "krt: Ignoring redirect to %I/%d via %I", dest, masklen, gw); + return; + } + net = net_get(&master_table, 0, dest, masklen); + if (net->routes) + { + rte *e = net->routes; + rta *a = e->attrs; + int ok; + switch (a->dest) + { + case RTD_ROUTER: + ok = (flags & RTF_GATEWAY) && ipa_equal(gw, a->gw); + break; + case RTD_DEVICE: +#ifdef CONFIG_AUTO_ROUTES + ok = 1; +#else + ok = !(flags & RTF_GATEWAY) && !strcmp(iface, a->iface->name); +#endif + break; + case RTD_UNREACHABLE: + ok = flags & RTF_REJECT; + default: + ok = 0; + } + net->n.flags |= ok ? KRF_SEEN : KRF_UPDATE; + } + else + { +#ifdef CONFIG_AUTO_ROUTES + if (!(flags & RTF_GATEWAY)) /* It's a device route */ + return; +#endif + net->n.flags |= KRF_UPDATE; + } +} + +static int +krt_scan_proc(void) +{ + byte buf[32768]; + int l, seen_hdr; + + if (krt_scan_fd < 0) + { + krt_scan_fd = open("/proc/net/route", O_RDONLY); + if (krt_scan_fd < 0) + die("/proc/net/route: %m"); + } + else if (lseek(krt_scan_fd, 0, SEEK_SET) < 0) + { + log(L_ERR "krt seek: %m"); + return 0; + } + seen_hdr = 0; + while ((l = read(krt_scan_fd, buf, sizeof(buf))) > 0) + { + byte *z = buf; + if (l & 127) + { + log(L_ERR "krt read: misaligned entry: l=%d", l); + return 0; + } + while (l >= 128) + { + if (seen_hdr++) + krt_parse_entry(z); + z += 128; + l -= 128; + } + } + if (l < 0) + { + log(L_ERR "krt read: %m"); + return 0; + } + DBG("KRT scan done, seen %d lines\n", seen_hdr); + return 1; +} + static void krt_scan_fire(timer *t) { + struct krt_proto *x = t->data; + SCANOPT; + DBG("Scanning kernel table...\n"); + if (!krt_scan_proc()) + return; } void |