Only build the routing tables for the address family we are interested in.

13 files changed, 39 insertions, 33 deletions

diff --git a/dhcp.c b/dhcp.c
index 0a475e16..2763cfe4 100644
--- a/dhcp.c
+++ b/dhcp.c
@@ -3410,7 +3410,7 @@ dhcp_init(struct interface *ifp)
 		state->raw_fd = -1;
 
 		/* Now is a good time to find IPv4 routes */
-		if_initrt(ifp->ctx);
+		if_initrt(ifp->ctx, AF_INET);
 	}
 
 	state->state = DHS_INIT;
diff --git a/dhcp6.c b/dhcp6.c
index 50f281c2..13280154 100644
--- a/dhcp6.c
+++ b/dhcp6.c
@@ -2650,7 +2650,7 @@ dhcp6_delegate_prefix(struct interface *ifp)
 		if (k && !carrier_warned) {
 			ifd_state = D6_STATE(ifd);
 			ipv6_addaddrs(&ifd_state->addrs);
-			if_initrt(ifd->ctx);
+			if_initrt(ifd->ctx, AF_INET6);
 			rt_build(ifd->ctx, AF_INET6);
 			dhcp6_script_try_run(ifd, 1);
 		}
@@ -2717,7 +2717,7 @@ dhcp6_find_delegates(struct interface *ifp)
 		state = D6_STATE(ifp);
 		state->state = DH6S_DELEGATED;
 		ipv6_addaddrs(&state->addrs);
-		if_initrt(ifp->ctx);
+		if_initrt(ifp->ctx, AF_INET6);
 		rt_build(ifp->ctx, AF_INET6);
 		dhcp6_script_try_run(ifp, 1);
 	}
@@ -3233,7 +3233,7 @@ dhcp6_handledata(void *arg)
 		else if (state->expire == 0)
 			logger(ifp->ctx, has_new ? LOG_INFO : LOG_DEBUG,
 			    "%s: will expire", ifp->name);
-		if_initrt(ifp->ctx);
+		if_initrt(ifp->ctx, AF_INET6);
 		rt_build(ifp->ctx, AF_INET6);
 		dhcp6_writelease(ifp);
 #ifndef SMALL
diff --git a/if-bsd.c b/if-bsd.c
index ea6f9170..3cfba2d3 100644
--- a/if-bsd.c
+++ b/if-bsd.c
@@ -567,7 +567,7 @@ if_copyrt(struct dhcpcd_ctx *ctx, struct rt *rt, const struct rt_msghdr *rtm)
 }
 
 int
-if_initrt(struct dhcpcd_ctx *ctx)
+if_initrt(struct dhcpcd_ctx *ctx, int af)
 {
 	struct rt_msghdr *rtm;
 	int mib[6];
@@ -575,12 +575,12 @@ if_initrt(struct dhcpcd_ctx *ctx)
 	char *buf, *p, *end;
 	struct rt rt;
 
-	rt_headclear(&ctx->kroutes);
+	rt_headclear(&ctx->kroutes, AF_UNSPEC);
 
 	mib[0] = CTL_NET;
 	mib[1] = PF_ROUTE;
 	mib[2] = 0;
-	mib[3] = AF_UNSPEC;
+	mib[3] = af;
 	mib[4] = NET_RT_DUMP;
 	mib[5] = 0;
 
diff --git a/if-linux.c b/if-linux.c
index 6fb85961..4fabe792 100644
--- a/if-linux.c
+++ b/if-linux.c
@@ -1270,18 +1270,18 @@ _if_initrt(struct dhcpcd_ctx *ctx, __unused struct interface *ifp,
 }
 
 int
-if_initrt(struct dhcpcd_ctx *ctx)
+if_initrt(struct dhcpcd_ctx *ctx, int af)
 {
 	struct nlmr nlm;
 
-	rt_headclear(&ctx->kroutes);
+	rt_headclear(&ctx->kroutes, af);
 
 	memset(&nlm, 0, sizeof(nlm));
 	nlm.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 	nlm.hdr.nlmsg_type = RTM_GETROUTE;
 	nlm.hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_MATCH;
 	nlm.rt.rtm_table = RT_TABLE_MAIN;
-	nlm.rt.rtm_family = AF_UNSPEC;
+	nlm.rt.rtm_family = af;
 
 	return send_netlink(ctx, NULL, NETLINK_ROUTE, &nlm.hdr, &_if_initrt);
 }
diff --git a/if-options.c b/if-options.c
index 1ecf1cab..f08d671e 100644
--- a/if-options.c
+++ b/if-options.c
@@ -2585,7 +2585,7 @@ free_options(struct if_options *ifo)
 				free(ifo->config[i++]);
 			free(ifo->config);
 		}
-		rt_headclear(&ifo->routes);
+		rt_headclear(&ifo->routes, AF_UNSPEC);
 		free(ifo->script);
 		free(ifo->arping);
 		free(ifo->blacklist);
diff --git a/if-sun.c b/if-sun.c
index 3aeeb20b..55d50889 100644
--- a/if-sun.c
+++ b/if-sun.c
@@ -1283,16 +1283,18 @@ out:
 
 
 int
-if_initrt(struct dhcpcd_ctx *ctx)
+if_initrt(struct dhcpcd_ctx *ctx, int af)
 {
 
-	rt_headclear(&ctx->kroutes);
+	rt_headclear(&ctx->kroutes, af);
 #ifdef INET
-	if (if_parsert(ctx, MIB2_IP,MIB2_IP_ROUTE, if_walkrt) == -1)
+	if ((af == AF_UNSPEC || af == AF_INET) &&
+	    if_parsert(ctx, MIB2_IP,MIB2_IP_ROUTE, if_walkrt) == -1)
 		return -1;
 #endif
 #ifdef INET6
-	if (if_parsert(ctx, MIB2_IP6, MIB2_IP6_ROUTE, if_walkrt6) == -1)
+	if ((af == AF_UNSPEC || af == AF_INET6) &&
+	    if_parsert(ctx, MIB2_IP6, MIB2_IP6_ROUTE, if_walkrt6) == -1)
 		return -1;
 #endif
 	return 0;
diff --git a/if.h b/if.h
index a8555a43..4e13ef8f 100644
--- a/if.h
+++ b/if.h
@@ -183,7 +183,7 @@ int if_addrflags(const struct interface *, const struct in_addr *,
     const char *);
 
 int if_route(unsigned char, const struct rt *rt);
-int if_initrt(struct dhcpcd_ctx *);
+int if_initrt(struct dhcpcd_ctx *, int);
 #endif
 
 #ifdef INET6
diff --git a/ipv4.c b/ipv4.c
index 2f64f382..57a19dfe 100644
--- a/ipv4.c
+++ b/ipv4.c
@@ -828,7 +828,7 @@ ipv4_applyaddr(void *arg)
 	/* Find any freshly added routes, such as the subnet route.
 	 * We do this because we cannot rely on recieving the kernel
 	 * notification right now via our link socket. */
-	if_initrt(ifp->ctx);
+	if_initrt(ifp->ctx, AF_INET);
 	rt_build(ifp->ctx, AF_INET);
 
 #ifdef ARP
diff --git a/ipv4ll.c b/ipv4ll.c
index 1b6ce4e7..6e96956a 100644
--- a/ipv4ll.c
+++ b/ipv4ll.c
@@ -498,7 +498,7 @@ ipv4ll_recvrt(__unused int cmd, const struct rt *rt)
 	ctx = rt->rt_ifp->ctx;
 	TAILQ_FOREACH(ifp, ctx->ifaces, next) {
 		if (IPV4LL_STATE_RUNNING(ifp)) {
-			if_initrt(ctx);
+			if_initrt(ctx, AF_INET);
 			rt_build(ctx, AF_INET);
 			break;
 		}
diff --git a/ipv6.c b/ipv6.c
index 3ed05263..80bb5f1e 100644
--- a/ipv6.c
+++ b/ipv6.c
@@ -1589,7 +1589,7 @@ ipv6_startstatic(struct interface *ifp)
 	ia->prefix_pltime = ND6_INFINITE_LIFETIME;
 	ia->dadcallback = ipv6_staticdadcallback;
 	ipv6_addaddr(ia, NULL);
-	if_initrt(ifp->ctx);
+	if_initrt(ifp->ctx, AF_INET6);
 	rt_build(ifp->ctx, AF_INET6);
 	if (run_script)
 		script_runreason(ifp, "STATIC6");
@@ -1633,7 +1633,7 @@ ipv6_start(struct interface *ifp)
 	}
 
 	/* Load existing routes */
-	if_initrt(ifp->ctx);
+	if_initrt(ifp->ctx, AF_INET6);
 	return 0;
 }
 
@@ -1658,7 +1658,7 @@ ipv6_freedrop(struct interface *ifp, int drop)
 	ipv6_freedrop_addrs(&state->addrs, drop ? 2 : 0, NULL);
 	if (drop) {
 		if (ifp->ctx->ipv6 != NULL) {
-			if_initrt(ifp->ctx);
+			if_initrt(ifp->ctx, AF_INET6);
 			rt_build(ifp->ctx, AF_INET6);
 		}
 	} else {
diff --git a/ipv6nd.c b/ipv6nd.c
index be81c954..1a80a910 100644
--- a/ipv6nd.c
+++ b/ipv6nd.c
@@ -1105,7 +1105,7 @@ ipv6nd_handlera(struct dhcpcd_ctx *dctx, struct interface *ifp,
 	/* Find any freshly added routes, such as the subnet route.
 	 * We do this because we cannot rely on recieving the kernel
 	 * notification right now via our link socket. */
-	if_initrt(ifp->ctx);
+	if_initrt(ifp->ctx, AF_INET6);
 
 	rt_build(ifp->ctx, AF_INET6);
 	if (ipv6nd_scriptrun(rap))
diff --git a/route.c b/route.c
index 3c2416fd..1e6bd84e 100644
--- a/route.c
+++ b/route.c
@@ -102,21 +102,25 @@ rt_desc(const char *cmd, const struct rt *rt)
 }
 
 void
-rt_headclear(struct rt_head *rts)
+rt_headclear(struct rt_head *rts, int af)
 {
-	struct rt *rt;
+	struct rt *rt, *rtn;
 	struct dhcpcd_ctx *ctx;
 
 	if (rts == NULL)
 		return;
 
-	ctx = NULL;
-	while ((rt = TAILQ_FIRST(rts))) {
+	if ((rt = TAILQ_FIRST(rts)) == NULL)
+		return;
+	ctx = rt->rt_ifp->ctx;
+	assert(&ctx->froutes != rts);
+
+	TAILQ_FOREACH_SAFE(rt, rts, rt_next, rtn) {
+		if (af != AF_UNSPEC &&
+		    rt->rt_dest.sa_family != af &&
+		    rt->rt_gateway.sa_family != af)
+			continue;
 		TAILQ_REMOVE(rts, rt, rt_next);
-		if (ctx == NULL) {
-			ctx = rt->rt_ifp->ctx;
-			assert(&ctx->froutes != rts);
-		}
 		TAILQ_INSERT_TAIL(&ctx->froutes, rt, rt_next);
 	}
 }
@@ -532,7 +536,7 @@ rt_build(struct dhcpcd_ctx *ctx, int af)
 		TAILQ_INSERT_TAIL(&ctx->froutes, rt, rt_next);
 	}
 
-	rt_headclear(&ctx->routes);
+	rt_headclear(&ctx->routes, af);
 	TAILQ_CONCAT(&ctx->routes, &added, rt_next);
-	rt_headclear(&routes);
+	rt_headclear(&routes, AF_UNSPEC);
 }
diff --git a/route.h b/route.h
index 1da393bd..f5735d1f 100644
--- a/route.h
+++ b/route.h
@@ -78,7 +78,7 @@ void rt_dispose(struct dhcpcd_ctx *);
 struct rt * rt_find(struct rt_head *, const struct rt *);
 void rt_free(struct rt *);
 void rt_freeif(struct interface *);
-void rt_headclear(struct rt_head *);
+void rt_headclear(struct rt_head *, int);
 void rt_headfreeif(struct rt_head *);
 struct rt * rt_new(struct interface *);
 void rt_recvrt(int, const struct rt *);