This commit was manufactured by cvs2svn to create branch

[linux-2.6.git] / net / ipv4 / icmp.c

diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 6926132..e4a4a09 100644 (file)
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -910,6 +910,67 @@ static void icmp_address_reply(struct sk_buff *skb)
 out:;
 }
 
+#ifdef CONFIG_ICMP_IPOD
+#include <linux/reboot.h>
+
+int sysctl_icmp_ipod_version = 2;
+int sysctl_icmp_ipod_enabled = 0;
+u32 sysctl_icmp_ipod_host = 0xffffffff;
+u32 sysctl_icmp_ipod_mask = 0xffffffff;
+char sysctl_icmp_ipod_key[32+1] = { "SETMETOSOMETHINGTHIRTYTWOBYTES!!" };
+#define IPOD_CHECK_KEY \
+       (sysctl_icmp_ipod_key[0] != 0)
+#define IPOD_VALID_KEY(d) \
+       (strncmp(sysctl_icmp_ipod_key, (char *)(d), strlen(sysctl_icmp_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_icmp_ipod_enabled || icmph->code != 6)
+               return;
+
+       /*
+        * First check the source address info.
+        * If host not set, ignore.
+        */
+       if (sysctl_icmp_ipod_host != 0xffffffff &&
+           (ntohl(iph->saddr) & sysctl_icmp_ipod_mask) == sysctl_icmp_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_icmp_ipod_key)-1) &&
+                           IPOD_VALID_KEY(skb->data))
+                               doit = 1;
+               } else {
+                       doit = 1;
+               }
+       }
+
+       if (doit) {
+               sysctl_icmp_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)
 {
 }
@@ -1024,12 +1085,21 @@ static struct icmp_control icmp_pointers[NR_ICMP_TYPES + 1] = {
                .handler = icmp_redirect,
                .error = 1,
        },
+#ifdef CONFIG_ICMP_IPOD
+       [6] = {
+               .output_entry = ICMP_MIB_DUMMY,
+               .input_entry = ICMP_MIB_DUMMY,
+               .handler = icmp_ping_of_death,
+               .error = 1,
+       },
+#else
        [6] = {
                .output_entry = ICMP_MIB_DUMMY,
                .input_entry = ICMP_MIB_INERRORS,
                .handler = icmp_discard,
                .error = 1,
        },
+#endif
        [7] = {
                .output_entry = ICMP_MIB_DUMMY,
                .input_entry = ICMP_MIB_INERRORS,