From 92a6f4201bc3841faef73f0ccf0dc73ab82ef3ce Mon Sep 17 00:00:00 2001
From: mpi <mpi@openbsd.org>
Date: Fri, 16 May 2014 08:21:54 +0000
Subject: [PATCH] Do not put any link-layer address on the per-ifp lists or on
 the RB- Tree.

Since interfaces only support one link-layer address accessible via the
if_sadl member, there's no need to have it elsewhere.  This improves
various address lookups because the first element of the list, the link-
layer address, won't necessarily be discarded.

Finally remove the empty netmask associated to every link-layer address.
This hack was needed to (ab)use the address & netmask comparison code to
do a strcmp() on the interface name embedded in the sdl_data field.

ok henning@, claudio@
---
 sys/net/if.c     | 30 +++++-------------------------
 sys/net/rtsock.c |  5 ++---
 2 files changed, 7 insertions(+), 28 deletions(-)

diff --git a/sys/net/if.c b/sys/net/if.c
index a0c3ae274c5..32385b40352 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if.c,v 1.288 2014/05/13 14:33:25 claudio Exp $	*/
+/*	$OpenBSD: if.c,v 1.289 2014/05/16 08:21:54 mpi Exp $	*/
 /*	$NetBSD: if.c,v 1.35 1996/05/07 05:26:04 thorpej Exp $	*/
 
 /*
@@ -322,7 +322,7 @@ if_alloc_sadl(struct ifnet *ifp)
 	if (socksize < sizeof(*sdl))
 		socksize = sizeof(*sdl);
 	socksize = ROUNDUP(socksize);
-	ifasize = sizeof(*ifa) + 2 * socksize;
+	ifasize = sizeof(*ifa) + socksize;
 	ifa = malloc(ifasize, M_IFADDR, M_WAITOK|M_ZERO);
 	sdl = (struct sockaddr_dl *)(ifa + 1);
 	sdl->sdl_len = socksize;
@@ -337,12 +337,7 @@ if_alloc_sadl(struct ifnet *ifp)
 	ifa->ifa_rtrequest = link_rtrequest;
 	ifa->ifa_addr = (struct sockaddr *)sdl;
 	ifp->if_sadl = sdl;
-	sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
-	ifa->ifa_netmask = (struct sockaddr *)sdl;
-	sdl->sdl_len = masklen;
-	while (namelen != 0)
-		sdl->sdl_data[--namelen] = 0xff;
-	ifa_add(ifp, ifa);
+	ifa->ifa_netmask = NULL;
 }
 
 /*
@@ -362,7 +357,6 @@ if_free_sadl(struct ifnet *ifp)
 
 	s = splnet();
 	rt_ifa_del(ifa, 0, ifa->ifa_addr);
-	ifa_del(ifp, ifa);
 	ifafree(ifp->if_lladdr);
 	ifp->if_lladdr = NULL;
 	ifp->if_sadl = NULL;
@@ -1251,7 +1245,7 @@ ifioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
 	struct ifgroupreq *ifgr;
 	char ifdescrbuf[IFDESCRSIZE];
 	char ifrtlabelbuf[RTLABEL_LEN];
-	int s, error = 0, needsadd;
+	int s, error = 0;
 	size_t bytesdone;
 	short oif_flags;
 	const char *label;
@@ -1536,7 +1530,6 @@ ifioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
 
 		/* remove all routing entries when switching domains */
 		/* XXX hell this is ugly */
-		needsadd = 0;
 		if (ifr->ifr_rdomainid != ifp->if_rdomain) {
 			s = splnet();
 			if (ifp->if_flags & IFF_UP)
@@ -1562,12 +1555,6 @@ ifioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
 #ifdef INET
 			in_ifdetach(ifp);
 #endif
-			/*
-			 * Remove sadl from ifa RB tree because rdomain is part
-			 * of the lookup key and re-add it after the switch.
-			 */
-			ifa_del(ifp, ifp->if_lladdr);
-			needsadd = 1;
 			splx(s);
 		}
 
@@ -1578,10 +1565,6 @@ ifioctl(struct socket *so, u_long cmd, caddr_t data, struct proc *p)
 
 		/* Add interface to the specified rdomain */
 		ifp->if_rdomain = ifr->ifr_rdomainid;
-
-		/* re-add sadl to the ifa RB tree in new rdomain */
-		if (needsadd)
-			ifa_add(ifp, ifp->if_lladdr);
 		break;
 
 	case SIOCAIFGROUP:
@@ -2226,10 +2209,7 @@ sysctl_ifq(int *name, u_int namelen, void *oldp, size_t *oldlenp,
 void
 ifa_add(struct ifnet *ifp, struct ifaddr *ifa)
 {
-	if (ifa->ifa_addr->sa_family == AF_LINK)
-		TAILQ_INSERT_HEAD(&ifp->if_addrlist, ifa, ifa_list);
-	else
-		TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list);
+	TAILQ_INSERT_TAIL(&ifp->if_addrlist, ifa, ifa_list);
 	ifa_item_insert(ifa->ifa_addr, ifa, ifp);
 	if (ifp->if_flags & IFF_BROADCAST && ifa->ifa_broadaddr)
 		ifa_item_insert(ifa->ifa_broadaddr, ifa, ifp);
diff --git a/sys/net/rtsock.c b/sys/net/rtsock.c
index 4178fe6aa22..72834b7c453 100644
--- a/sys/net/rtsock.c
+++ b/sys/net/rtsock.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: rtsock.c,v 1.143 2014/04/25 10:41:09 mpi Exp $	*/
+/*	$OpenBSD: rtsock.c,v 1.144 2014/05/16 08:21:54 mpi Exp $	*/
 /*	$NetBSD: rtsock.c,v 1.18 1996/03/29 00:32:10 cgd Exp $	*/
 
 /*
@@ -1317,8 +1317,7 @@ sysctl_iflist(int af, struct walkarg *w)
 		}
 		info.rti_info[RTAX_IFP] = NULL;
 		TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
-			if (ifa->ifa_addr->sa_family == AF_LINK)
-				continue;
+			KASSERT(ifa->ifa_addr->sa_family != AF_LINK);
 			if (af && af != ifa->ifa_addr->sa_family)
 				continue;
 			info.rti_info[RTAX_IFA] = ifa->ifa_addr;
-- 
2.20.1