Netlink scans routes...
This commit is contained in:
Martin Mares
parent
51ad41f2fc
commit
aa64578641
1 changed files with 175 additions and 7 deletions
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@ -44,6 +44,10 @@
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#define MSG_TRUNC 0x20
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#endif
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#ifndef RTPROT_BIRD /* FIXME: Kill after Alexey assigns as a number */
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#define RTPROT_BIRD 13
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#endif
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/*
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* Synchronous Netlink interface
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*/
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@ -280,9 +284,9 @@ nl_parse_addr(struct nlmsghdr *h)
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return;
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if (i->ifa_family != AF_INET)
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return;
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if (!a[IFA_ADDRESS] || RTA_PAYLOAD(a[IFA_ADDRESS]) != 4 ||
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!a[IFA_LOCAL] || RTA_PAYLOAD(a[IFA_LOCAL]) != 4 ||
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(a[IFA_BROADCAST] && RTA_PAYLOAD(a[IFA_BROADCAST]) != 4))
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if (!a[IFA_ADDRESS] || RTA_PAYLOAD(a[IFA_ADDRESS]) != sizeof(ip_addr) ||
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!a[IFA_LOCAL] || RTA_PAYLOAD(a[IFA_LOCAL]) != sizeof(ip_addr) ||
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(a[IFA_BROADCAST] && RTA_PAYLOAD(a[IFA_BROADCAST]) != sizeof(ip_addr)))
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{
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log(L_ERR "nl_parse_addr: Malformed message received");
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return;
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@ -364,21 +368,184 @@ krt_if_scan(struct krt_proto *p)
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* Routes
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*/
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int
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int /* FIXME: Check use of this function in krt.c */
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krt_capable(rte *e)
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{
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return 1; /* FIXME */
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rta *a = e->attrs;
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if (a->cast != RTC_UNICAST) /* FIXME: For IPv6, we might support anycasts as well */
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return 0;
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switch (a->dest)
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{
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case RTD_ROUTER:
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case RTD_DEVICE:
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case RTD_BLACKHOLE:
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case RTD_UNREACHABLE:
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case RTD_PROHIBIT:
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break;
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default:
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return 0;
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}
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return 1;
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}
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void
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krt_set_notify(struct proto *p, net *n, rte *new, rte *old)
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static void
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krt_delete(rte *e)
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{
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/* FIXME */
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}
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static void
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krt_insert(rte *e)
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{
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/* FIXME */
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}
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void
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krt_set_notify(struct proto *p, net *n, rte *new, rte *old)
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{
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/* FIXME: Use route updates if possible */
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if (old)
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krt_delete(old);
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if (new)
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krt_insert(new);
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}
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struct iface *
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krt_temp_iface(struct krt_proto *p, unsigned index)
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{
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struct iface *i, *j;
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WALK_LIST(i, p->scan.temp_ifs)
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if (i->index == index)
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return i;
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i = mb_alloc(p->p.pool, sizeof(struct iface));
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bzero(i, sizeof(*i));
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if (j = if_find_by_index(index))
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strcpy(i->name, j->name);
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else
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strcpy(i->name, "?");
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i->index = index;
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add_tail(&p->scan.temp_ifs, &i->n);
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return i;
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}
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static void
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nl_parse_route(struct krt_proto *p, struct nlmsghdr *h, int scan)
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{
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struct rtmsg *i;
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struct rtattr *a[RTA_CACHEINFO+1];
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int new = h->nlmsg_type == RTM_NEWROUTE;
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ip_addr dst;
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rta ra;
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rte *e;
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net *net;
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u32 oif;
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if (!(i = nl_checkin(h, sizeof(*i))) || !nl_parse_attrs(RTM_RTA(i), a, sizeof(a)))
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return;
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if (i->rtm_family != AF_INET)
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return;
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if ((a[RTA_DST] && RTA_PAYLOAD(a[RTA_DST]) != sizeof(ip_addr)) ||
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(a[RTA_OIF] && RTA_PAYLOAD(a[RTA_OIF]) != 4) ||
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(a[RTA_GATEWAY] && RTA_PAYLOAD(a[RTA_GATEWAY]) != sizeof(ip_addr)))
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{
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log(L_ERR "nl_parse_route: Malformed message received");
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return;
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}
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if (i->rtm_table != RT_TABLE_MAIN) /* FIXME: What about other tables? */
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return;
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if (i->rtm_tos != 0) /* FIXME: What about TOS? */
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return;
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if (!new)
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{
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DBG("KRT: Ignoring route deletion\n");
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return;
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}
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if (a[RTA_DST])
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{
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memcpy(&dst, RTA_DATA(a[RTA_DST]), sizeof(dst));
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dst = ipa_ntoh(dst);
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}
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else
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dst = IPA_NONE;
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if (a[RTA_OIF])
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memcpy(&oif, RTA_DATA(a[RTA_OIF]), sizeof(oif));
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else
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oif = ~0;
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DBG("Got %I/%d, type=%d, oif=%d\n", dst, i->rtm_dst_len, i->rtm_type, oif);
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net = net_get(&master_table, 0, dst, i->rtm_dst_len);
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ra.proto = &p->p;
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ra.source = RTS_INHERIT;
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ra.scope = SCOPE_UNIVERSE; /* FIXME: Use kernel scope? */
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ra.cast = RTC_UNICAST;
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ra.tos = ra.flags = ra.aflags = 0;
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ra.from = IPA_NONE;
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ra.gw = IPA_NONE;
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ra.iface = NULL;
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ra.attrs = NULL;
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switch (i->rtm_type)
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{
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case RTN_UNICAST:
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if (oif == ~0U)
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{
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log(L_ERR "KRT: Mysterious route with no OIF (%I/%d)", net->n.prefix, net->n.pxlen);
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return;
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}
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if (a[RTA_GATEWAY])
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{
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neighbor *ng;
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ra.dest = RTD_ROUTER;
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memcpy(&ra.gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ra.gw));
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ra.gw = ipa_ntoh(ra.gw);
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ng = neigh_find(&p->p, &ra.gw, 0);
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if (ng)
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ra.iface = ng->iface;
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else
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/* FIXME: Remove this warning? */
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log(L_WARN "Kernel told us to use non-neighbor %I for %I/%d", ra.gw, net->n.prefix, net->n.pxlen);
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}
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else
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{
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ra.dest = RTD_DEVICE;
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ra.iface = krt_temp_iface(p, oif);
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}
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break;
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case RTN_BLACKHOLE:
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ra.dest = RTD_BLACKHOLE;
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break;
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case RTN_UNREACHABLE:
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ra.dest = RTD_UNREACHABLE;
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break;
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case RTN_PROHIBIT:
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ra.dest = RTD_PROHIBIT;
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break;
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/* FIXME: What about RTN_THROW? */
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default:
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DBG("KRT: Ignoring route with type=%d\n", i->rtm_type);
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return;
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}
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e = rte_get_temp(&ra);
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e->net = net;
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krt_got_route(p, e);
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}
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void
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krt_scan_fire(struct krt_proto *p)
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{
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struct nlmsghdr *h;
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nl_request_dump(RTM_GETROUTE);
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while (h = nl_get_scan())
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if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
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nl_parse_route(p, h, 1);
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else
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log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
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}
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/*
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@ -429,6 +596,7 @@ krt_scan_preconfig(struct krt_config *x)
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void
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krt_scan_start(struct krt_proto *p)
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{
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init_list(&p->scan.temp_ifs);
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nl_open();
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if (KRT_CF->scan.async)
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nl_open_async(p);
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