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List:       busybox
Subject:    [BusyBox] ifconfig changes
From:       Bart Visscher <magick () Linux-Fan ! com>
Date:       2002-04-28 8:58:49
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Changelog:
* Add add/del for IPv6

Remark:
The code doesn't work for IPv4, i thought it would work but after testing it
showed it didn't. IPv4 is basicly using the device aliases for the added
address.
The IPv6 address branch should check for the add/del, because nowhere else are
IPv6 addresses used/needed.

["10-ifconfig.patch" (text/x-patch)]

diff -ru -X exclude -P busybox-libbb/include/usage.h busybox-libbb-0/include/usage.h
--- busybox-libbb/include/usage.h	Sat Apr 27 22:14:07 2002
+++ busybox-libbb-0/include/usage.h	Sat Apr 27 22:03:04 2002
@@ -738,6 +738,8 @@
 #define ifconfig_full_usage \
 	"configure a network interface\n\n" \
 	"Options:\n" \
+	"[add <address>[/<prefixlen>]]\n" \
+	"[del <address>[/<prefixlen>]]\n" \
 	"\t[[-]broadcast [<address>]]  [[-]pointopoint [<address>]]\n" \
 	"\t[netmask <address>]  [dstaddr <address>]\n" \
 	USAGE_SIOCSKEEPALIVE("\t[outfill <NN>] [keepalive <NN>]\n") \
diff -ru -X exclude -P busybox-libbb/networking/ifconfig.c busybox-libbb-0/networking/ifconfig.c
--- busybox-libbb/networking/ifconfig.c	Sat Apr 27 22:14:58 2002
+++ busybox-libbb-0/networking/ifconfig.c	Sat Apr 27 22:15:02 2002
@@ -27,6 +27,9 @@
  * args missing from initial port.
  *
  * Still missing:  media, tunnel.
+ *
+ * 2002-04-20
+ * IPV6 support added by Bart Visscher <magick@linux-fan.com>
  */
 
 #include <stdio.h>
@@ -65,6 +68,12 @@
 #define IFF_DYNAMIC     0x8000  /* dialup device with changing addresses */
 #endif
 
+struct in6_ifreq {
+	struct in6_addr	ifr6_addr;
+	uint32_t	ifr6_prefixlen;
+	int		ifr6_ifindex; 
+};
+
 /*
  * Here are the bit masks for the "flags" member of struct options below.
  * N_ signifies no arg prefix; M_ signifies arg prefixed by '-'.
@@ -143,6 +152,7 @@
 #define ARG_KEEPALIVE    (A_ARG_REQ | A_CAST_CHAR_PTR)
 #define ARG_OUTFILL      (A_ARG_REQ | A_CAST_CHAR_PTR)
 #define ARG_HOSTNAME     (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER | A_COLON_CHK)
+#define ARG_ADD_DEL      (A_CAST_HOST_COPY_RESOLVE | A_SET_AFTER)
 
 
 /*
@@ -187,6 +197,10 @@
 	{"SIOCSIFMAP",     SIOCSIFMAP,     ifreq_offsetof(ifr_map.irq)},
 #endif
 	/* Last entry if for unmatched (possibly hostname) arg. */
+#if CONFIG_FEATURE_IPV6
+	{"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
+	{"SIOCDIFADDR",    SIOCDIFADDR,    ifreq_offsetof(ifr_addr)}, /* IPv6 version ignores the offset */
+#endif
 	{"SIOCSIFADDR",    SIOCSIFADDR,    ifreq_offsetof(ifr_addr)},
 };
 
@@ -212,6 +226,10 @@
 	{"io_addr",      N_ARG,         ARG_IO_ADDR,     0},
 	{"irq",          N_ARG,         ARG_IRQ,         0},
 #endif
+#if CONFIG_FEATURE_IPV6
+	{"add",          N_ARG,         ARG_ADD_DEL,     0},
+	{"del",          N_ARG,         ARG_ADD_DEL,     0},
+#endif
 	{"arp",          N_CLR | M_SET, 0,               IFF_NOARP},
 	{"trailers",     N_CLR | M_SET, 0,               IFF_NOTRAILERS},
 	{"promisc",      N_SET | M_CLR, 0,               IFF_PROMISC},
@@ -244,6 +262,9 @@
 {
 	struct ifreq ifr;
 	struct sockaddr_in sai;
+#if CONFIG_FEATURE_IPV6
+	struct sockaddr_in6 sai6;
+#endif
 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 	struct sockaddr sa;
 #endif
@@ -334,12 +355,54 @@
 #ifdef CONFIG_FEATURE_IFCONFIG_HW
 					if (mask & A_CAST_RESOLVE) {
 #endif
+#if CONFIG_FEATURE_IPV6
+						char *prefix;
+						int prefix_len=0;
+#endif
+
 						safe_strncpy(host, *argv, (sizeof host));
+#if CONFIG_FEATURE_IPV6
+						if ((prefix = strchr(host, '/'))) {
+							prefix_len = atol(prefix + 1);
+							if ((prefix_len < 0) || (prefix_len > 128)) {
+								++goterr;
+								goto LOOP;
+							}
+							*prefix = 0;
+						}
+#endif
+
 						sai.sin_family = AF_INET;
 						sai.sin_port = 0;
 						if (!strcmp(host, bb_INET_default)) {
 							/* Default is special, meaning 0.0.0.0. */
 							sai.sin_addr.s_addr = INADDR_ANY;
+						} else
+#if CONFIG_FEATURE_IPV6
+						if (inet_pton(AF_INET6, host, &sai6.sin6_addr) > 0) {
+							int sockfd6;
+							struct in6_ifreq ifr6;
+							
+							memcpy((char *) &ifr6.ifr6_addr, (char *) &sai6.sin6_addr,
+							                              sizeof(struct in6_addr));
+
+							/* Create a channel to the NET kernel. */
+							if ((sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+								perror_msg_and_die("socket6");
+							}
+							if (ioctl(sockfd6, SIOGIFINDEX, &ifr) < 0) {
+								perror("SIOGIFINDEX");
+								++goterr;
+							continue;
+							}
+							ifr6.ifr6_ifindex = ifr.ifr_ifindex;
+							ifr6.ifr6_prefixlen = prefix_len;
+							if (ioctl(sockfd6, a1op->selector, &ifr6) < 0) {
+								perror(a1op->name);
+								++goterr;
+							}
+							continue;
+#endif
 						} else if (inet_aton(host, &sai.sin_addr) == 0) {
 							/* It's not a dotted quad. */
 							++goterr;

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