+/*
+ * FUNCTION: llc_rtrequest
+ *
+ * PURPOSE: Manage routing table entries specific to LLC for ISO.
+ *
+ * NOTES: This does a lot of obscure magic;
+ */
+llc_rtrequest(req, rt, sa)
+int req;
+register struct rtentry *rt;
+struct sockaddr *sa;
+{
+ register union sockunion *gate = (union sockunion *)rt->rt_gateway;
+ register struct llinfo_llc *lc = (struct llinfo_llc *)rt->rt_llinfo, *lc2;
+ struct rtentry *rt2;
+ struct ifnet *ifp = rt->rt_ifp;
+ int addrlen = ifp->if_addrlen;
+#define LLC_SIZE 3 /* XXXXXX do this right later */
+
+ IFDEBUG (D_SNPA)
+ printf("llc_rtrequest(%d, %x, %x)\n", req, rt, sa);
+ ENDDEBUG
+ if (rt->rt_flags & RTF_GATEWAY)
+ return;
+ else switch (req) {
+ case RTM_ADD:
+ /*
+ * Case 1: This route may come from a route to iface with mask
+ * or from a default route.
+ */
+ if (rt->rt_flags & RTF_CLONING) {
+ rt_setgate(rt, rt_key(rt), &blank_dl);
+ return;
+ }
+ if (lc != 0)
+ return; /* happens on a route change */
+ /* FALLTHROUGH */
+ case RTM_RESOLVE:
+ /*
+ * Case 2: This route may come from cloning, or a manual route
+ * add with a LL address.
+ */
+ if (gate->sdl.sdl_family != AF_LINK) {
+ log(LOG_DEBUG, "llc_rtrequest: got non-link non-gateway route\n");
+ break;
+ }
+ R_Malloc(lc, struct llinfo_llc *, sizeof (*lc));
+ rt->rt_llinfo = (caddr_t)lc;
+ if (lc == 0) {
+ log(LOG_DEBUG, "llc_rtrequest: malloc failed\n");
+ break;
+ }
+ Bzero(lc, sizeof(*lc));
+ lc->lc_rt = rt;
+ rt->rt_flags |= RTF_LLINFO;
+ insque(lc, &llinfo_llc);
+ if (gate->sdl.sdl_alen == sizeof(struct esis_req) + addrlen) {
+ gate->sdl.sdl_alen -= sizeof(struct esis_req);
+ bcopy(addrlen + LLADDR(&gate->sdl),
+ (caddr_t)&lc->lc_er, sizeof(lc->lc_er));
+ } else if (gate->sdl.sdl_alen == addrlen)
+ lc->lc_flags = (SNPA_ES | SNPA_VALID | SNPA_PERM);
+ break;
+ case RTM_DELETE:
+ if (lc == 0 || (rt->rt_flags & RTF_CLONING))
+ return;
+ remque(lc);
+ Free(lc);
+ rt->rt_llinfo = 0;
+ rt->rt_flags &= ~RTF_LLINFO;
+ break;
+ }
+ if (rt->rt_rmx.rmx_mtu == 0) {
+ rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu - LLC_SIZE;
+ }
+}