From d44ddba96c0c98edac3e1f29341a7b64fed81965 Mon Sep 17 00:00:00 2001
From: Ruslan Ermilov <ru@FreeBSD.org>
Date: Tue, 11 Sep 2001 17:14:33 +0000
Subject: [PATCH] Implement the ``-f address_family'' filter for -i.

Prodded by:	Igor Podlesny <poige@morning.ru>
---
 usr.bin/netstat/if.c      | 8 +++++++-
 usr.bin/netstat/main.c    | 5 ++++-
 usr.bin/netstat/netstat.1 | 4 +++-
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/usr.bin/netstat/if.c b/usr.bin/netstat/if.c
index ca88fce7530..4fb63b86ef1 100644
--- a/usr.bin/netstat/if.c
+++ b/usr.bin/netstat/if.c
@@ -251,7 +251,6 @@ intpr(int interval, u_long ifnetaddr, void (*pfunc)(char *))
 			*cp = '\0';
 			ifaddraddr = (u_long)TAILQ_FIRST(&ifnet.if_addrhead);
 		}
-		printf("%-5.5s %-5lu ", name, ifnet.if_mtu);
 		ifaddrfound = ifaddraddr;
 
 		/*
@@ -269,6 +268,7 @@ intpr(int interval, u_long ifnetaddr, void (*pfunc)(char *))
 		drops = ifnet.if_snd.ifq_drops;
 
 		if (ifaddraddr == 0) {
+			printf("%-5.5s %-5lu ", name, ifnet.if_mtu);
 			printf("%-13.13s ", "none");
 			printf("%-15.15s ", "none");
 		} else {
@@ -280,6 +280,12 @@ intpr(int interval, u_long ifnetaddr, void (*pfunc)(char *))
 			cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 				CP(&ifaddr);
 			sa = (struct sockaddr *)cp;
+			if (af != AF_UNSPEC && sa->sa_family != af) {
+				ifaddraddr =
+				    (u_long)TAILQ_NEXT(&ifaddr.ifa, ifa_link);
+				continue;
+			}
+			printf("%-5.5s %-5lu ", name, ifnet.if_mtu);
 			switch (sa->sa_family) {
 			case AF_UNSPEC:
 				printf("%-13.13s ", "none");
diff --git a/usr.bin/netstat/main.c b/usr.bin/netstat/main.c
index 46e03f59f4f..8d1e044922a 100644
--- a/usr.bin/netstat/main.c
+++ b/usr.bin/netstat/main.c
@@ -393,6 +393,8 @@ main(argc, argv)
 			else if (strcmp(optarg, "iso") == 0)
 				af = AF_ISO;
 #endif
+			else if (strcmp(optarg, "link") == 0)
+				af = AF_LINK;
 			else {
 				errx(1, "%s: unknown address family", optarg);
 			}
@@ -754,7 +756,8 @@ usage(void)
 	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
 "usage: netstat [-AaLnSW] [-f protocol_family | -p protocol]\n"
 "               [-M core] [-N system]",
-"       netstat -i | -I interface [-abdnt] [-M core] [-N system]",
+"       netstat -i | -I interface [-abdnt] [-f address_family]\n"
+"               [-M core] [-N system]",
 "       netstat -w wait [-I interface] [-d] [-M core] [-N system]",
 "       netstat -s [-s] [-z] [-f protocol_family | -p protocol] [-M core]",
 "       netstat -i | -I interface -s [-f protocol_family | -p protocol]\n"
diff --git a/usr.bin/netstat/netstat.1 b/usr.bin/netstat/netstat.1
index 7ce61f7dc72..5662eccb6bd 100644
--- a/usr.bin/netstat/netstat.1
+++ b/usr.bin/netstat/netstat.1
@@ -90,6 +90,7 @@ but show ports symbolically.
 .Nm
 .Fl i | I Ar interface
 .Op Fl abdnt
+.Op Fl f Ar address_family
 .Op Fl M Ar core
 .Op Fl N Ar system
 .Ek
@@ -109,7 +110,7 @@ is also present, multicast addresses currently in use are shown
 for each Ethernet interface and for each IP interface address.
 Multicast addresses are shown on separate lines following the interface
 address with which they are associated.
-It
+If
 .Fl b
 is also present, show the number of bytes in and out.
 If
@@ -286,6 +287,7 @@ The following address families and protocols are recognized:
 .\".It Cm iso Pq Dv AF_ISO
 .\".Cm clnp , cltp , esis , tp
 .It Cm unix Pq Dv AF_UNIX
+.It Cm link Pq Dv AF_LINK
 .El
 .Pp
 The program will complain if