patch-ipod-linux-2.4.20-31.9 4.63 KB
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--- include/linux/sysctl.h~	2004-04-13 15:41:44.000000000 -0600
+++ include/linux/sysctl.h	2004-07-12 16:05:14.000000000 -0600
@@ -299,6 +299,13 @@
 	NET_TCP_FRTO=92,
 	NET_TCP_LOW_LATENCY=93,
 	NET_IPV4_IPFRAG_SECRET_INTERVAL=94,
+
+	/* CONFIG_ICMP_PINGOFDEATH */
+	NET_IPV4_ICMP_POD_ENABLED=95,
+	NET_IPV4_ICMP_POD_HOST=96,
+	NET_IPV4_ICMP_POD_MASK=97,
+	NET_IPV4_ICMP_POD_KEY=98,
+	NET_IPV4_ICMP_POD_VERSION=99,
 };
 
 enum {
--- net/ipv4/Config.in~	2001-12-21 10:42:05.000000000 -0700
+++ net/ipv4/Config.in	2004-07-12 16:06:56.000000000 -0600
@@ -44,3 +44,8 @@
 if [ "$CONFIG_NETFILTER" != "n" ]; then
    source net/ipv4/netfilter/Config.in
 fi
+
+#
+# Emulab special
+#
+bool '  ICMP: ICMP Ping-of-Death (Emulab)' CONFIG_ICMP_PINGOFDEATH
--- net/ipv4/icmp.c~	2004-04-13 15:07:12.000000000 -0600
+++ net/ipv4/icmp.c	2004-07-12 16:18:51.000000000 -0600
@@ -840,6 +840,67 @@
 	in_dev_put(in_dev);
 }
 
+#ifdef CONFIG_ICMP_PINGOFDEATH
+#include <linux/reboot.h>
+
+int sysctl_ipod_version = 2;
+int sysctl_ipod_enabled = 0;
+u32 sysctl_ipod_host = 0xffffffff;
+u32 sysctl_ipod_mask = 0xffffffff;
+char sysctl_ipod_key[32+1] = { "SETMETOSOMETHINGTHIRTYTWOBYTES!!" };
+#define IPOD_CHECK_KEY \
+	(sysctl_ipod_key[0] != 0)
+#define IPOD_VALID_KEY(d) \
+	(strncmp(sysctl_ipod_key, (char *)(d), strlen(sysctl_ipod_key)) == 0)
+
+static void icmp_ping_of_death(struct sk_buff *skb)
+{
+	struct icmphdr *icmph = skb->h.icmph;
+	struct iphdr *iph = skb->nh.iph;
+	int doit = 0;
+
+#if 0
+	printk(KERN_INFO "IPOD: got type=6, code=%d, host=%u.%u.%u.%u\n", icmph->code, ntohs(iph->tot_len), NIPQUAD(iph->saddr));
+#endif
+
+	/*
+	 * If IPOD not enabled or wrong ICMP code, ignore.
+	 */
+	if (!sysctl_ipod_enabled || icmph->code != 6)
+		return;
+
+	/*
+	 * First check the source address info.
+	 * If host not set, ignore.
+	 */
+	if (sysctl_ipod_host != 0xffffffff &&
+	    (ntohl(iph->saddr) & sysctl_ipod_mask) == sysctl_ipod_host) {
+		/*
+		 * Now check the key if enabled.
+		 * If packet doesn't contain enough data or key
+		 * is otherwise invalid, ignore.
+		 */
+		if (IPOD_CHECK_KEY) {
+			if (pskb_may_pull(skb, sizeof(sysctl_ipod_key)-1) &&
+			    IPOD_VALID_KEY(skb->data))
+				doit = 1;
+		} else {
+			doit = 1;
+		}
+	}
+
+	if (doit) {
+		sysctl_ipod_enabled = 0;
+		printk(KERN_CRIT "IPOD: reboot forced by %u.%u.%u.%u...\n",
+		       NIPQUAD(iph->saddr));
+		machine_restart(NULL);
+	} else {
+		printk(KERN_WARNING "IPOD: from %u.%u.%u.%u rejected\n",
+		       NIPQUAD(iph->saddr));
+	}
+}
+#endif
+
 static void icmp_discard(struct sk_buff *skb)
 {
 }
8ics[0].IcmpOutSrcQuenchs, &icmp_statistics[0].IcmpInSrcQuenchs, icmp_unreach, 1 },
 /* REDIRECT (5) */
  { &icmp_statistics[0].IcmpOutRedirects, &icmp_statistics[0].IcmpInRedirects, icmp_redirect, 1 },
+#ifdef CONFIG_ICMP_PINGOFDEATH
+/* PING_OF_DEATH (6) */
+ { &icmp_statistics[0].dummy, &icmp_statistics[0].dummy, icmp_ping_of_death, 1, },
+#else
  { &icmp_statistics[0].dummy, &icmp_statistics[0].IcmpInErrors, icmp_discard, 1 },
+#endif
  { &icmp_statistics[0].dummy, &icmp_statistics[0].IcmpInErrors, icmp_discard, 1 },
 /* ECHO (8) */
  { &icmp_statistics[0].IcmpOutEchos, &icmp_statistics[0].IcmpInEchos, icmp_echo, 0 },
--- net/ipv4/sysctl_net_ipv4.c~	2004-04-13 15:07:14.000000000 -0600
+++ net/ipv4/sysctl_net_ipv4.c	2004-07-12 16:24:35.000000000 -0600
@@ -22,6 +22,13 @@
 extern int sysctl_icmp_echo_ignore_all;
 extern int sysctl_icmp_echo_ignore_broadcasts;
 extern int sysctl_icmp_ignore_bogus_error_responses;
+#ifdef CONFIG_ICMP_PINGOFDEATH
+extern int sysctl_ipod_version;
+extern int sysctl_ipod_enabled;
+extern u32 sysctl_ipod_host;
+extern u32 sysctl_ipod_mask;
+extern char sysctl_ipod_key[32+1];
+#endif
 
 /* From ip_fragment.c */
 extern int sysctl_ipfrag_low_thresh;
@@ -177,6 +184,18 @@
 	{NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES, "icmp_ignore_bogus_error_responses",
 	 &sysctl_icmp_ignore_bogus_error_responses, sizeof(int), 0644, NULL,
 	 &proc_dointvec},
+#ifdef CONFIG_ICMP_PINGOFDEATH
+	{NET_IPV4_ICMP_POD_ENABLED, "icmp_ipod_version",
+	 &sysctl_ipod_version, sizeof(int), 0444, NULL, &proc_dointvec},
+	{NET_IPV4_ICMP_POD_ENABLED, "icmp_ipod_enabled",
+	 &sysctl_ipod_enabled, sizeof(int), 0644, NULL, &proc_dointvec},
+	{NET_IPV4_ICMP_POD_HOST, "icmp_ipod_host",
+	 &sysctl_ipod_host, sizeof(int), 0644, NULL, &proc_dointvec},
+	{NET_IPV4_ICMP_POD_MASK, "icmp_ipod_mask",
+	 &sysctl_ipod_mask, sizeof(int), 0644, NULL, &proc_dointvec},
+	{NET_IPV4_ICMP_POD_KEY, "icmp_ipod_key",
+	 sysctl_ipod_key, sizeof(sysctl_ipod_key), 0600, NULL, &proc_dostring, &sysctl_string},
+#endif
 	{NET_IPV4_ROUTE, "route", NULL, 0, 0555, ipv4_route_table},
 #ifdef CONFIG_IP_MULTICAST
 	{NET_IPV4_IGMP_MAX_MEMBERSHIPS, "igmp_max_memberships",