Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 822 insertions, 0 deletions

diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
new file mode 100644
index 000000000000..87b9082ceab2
--- /dev/null
+++ b/net/ipv6/icmp.c
@@ -0,0 +1,822 @@
+/*
+ *      Internet Control Message Protocol (ICMPv6)
+ *      Linux INET6 implementation
+ *
+ *      Authors:
+ *      Pedro Roque             <roque@di.fc.ul.pt>
+ *
+ *      $Id: icmp.c,v 1.38 2002/02/08 03:57:19 davem Exp $
+ *
+ *      Based on net/ipv4/icmp.c
+ *
+ *      RFC 1885
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+/*
+ *      Changes:
+ *
+ *      Andi Kleen              :       exception handling
+ *      Andi Kleen                      add rate limits. never reply to a icmp.
+ *                                      add more length checks and other fixes.
+ *      yoshfuji                :       ensure to sent parameter problem for
+ *                                      fragments.
+ *      YOSHIFUJI Hideaki @USAGI:       added sysctl for icmp rate limit.
+ *      Randy Dunlap and
+ *      YOSHIFUJI Hideaki @USAGI:       Per-interface statistics support
+ *      Kazunori MIYAZAWA @USAGI:       change output process to use ip6_append_data
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/icmpv6.h>
+
+#include <net/ip.h>
+#include <net/sock.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_checksum.h>
+#include <net/protocol.h>
+#include <net/raw.h>
+#include <net/rawv6.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/icmp.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics);
+
+/*
+ *      The ICMP socket(s). This is the most convenient way to flow control
+ *      our ICMP output as well as maintain a clean interface throughout
+ *      all layers. All Socketless IP sends will soon be gone.
+ *
+ *      On SMP we have one ICMP socket per-cpu.
+ */
+static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL;
+#define icmpv6_socket   __get_cpu_var(__icmpv6_socket)
+
+static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
+
+static struct inet6_protocol icmpv6_protocol = {
+        .handler        =       icmpv6_rcv,
+        .flags          =       INET6_PROTO_FINAL,
+};
+
+static __inline__ int icmpv6_xmit_lock(void)
+{
+        local_bh_disable();
+
+        if (unlikely(!spin_trylock(&icmpv6_socket->sk->sk_lock.slock))) {
+                /* This can happen if the output path (f.e. SIT or
+                 * ip6ip6 tunnel) signals dst_link_failure() for an
+                 * outgoing ICMP6 packet.
+                 */
+                local_bh_enable();
+                return 1;
+        }
+        return 0;
+}
+
+static __inline__ void icmpv6_xmit_unlock(void)
+{
+        spin_unlock_bh(&icmpv6_socket->sk->sk_lock.slock);
+}
+
+/* 
+ * Slightly more convenient version of icmpv6_send.
+ */
+void icmpv6_param_prob(struct sk_buff *skb, int code, int pos)
+{
+        icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos, skb->dev);
+        kfree_skb(skb);
+}
+
+/*
+ * Figure out, may we reply to this packet with icmp error.
+ *
+ * We do not reply, if:
+ *      - it was icmp error message.
+ *      - it is truncated, so that it is known, that protocol is ICMPV6
+ *        (i.e. in the middle of some exthdr)
+ *
+ *      --ANK (980726)
+ */
+
+static int is_ineligible(struct sk_buff *skb)
+{
+        int ptr = (u8*)(skb->nh.ipv6h+1) - skb->data;
+        int len = skb->len - ptr;
+        __u8 nexthdr = skb->nh.ipv6h->nexthdr;
+
+        if (len < 0)
+                return 1;
+
+        ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, len);
+        if (ptr < 0)
+                return 0;
+        if (nexthdr == IPPROTO_ICMPV6) {
+                u8 _type, *tp;
+                tp = skb_header_pointer(skb,
+                        ptr+offsetof(struct icmp6hdr, icmp6_type),
+                        sizeof(_type), &_type);
+                if (tp == NULL ||
+                    !(*tp & ICMPV6_INFOMSG_MASK))
+                        return 1;
+        }
+        return 0;
+}
+
+static int sysctl_icmpv6_time = 1*HZ; 
+
+/* 
+ * Check the ICMP output rate limit 
+ */
+static inline int icmpv6_xrlim_allow(struct sock *sk, int type,
+                                     struct flowi *fl)
+{
+        struct dst_entry *dst;
+        int res = 0;
+
+        /* Informational messages are not limited. */
+        if (type & ICMPV6_INFOMSG_MASK)
+                return 1;
+
+        /* Do not limit pmtu discovery, it would break it. */
+        if (type == ICMPV6_PKT_TOOBIG)
+                return 1;
+
+        /* 
+         * Look up the output route.
+         * XXX: perhaps the expire for routing entries cloned by
+         * this lookup should be more aggressive (not longer than timeout).
+         */
+        dst = ip6_route_output(sk, fl);
+        if (dst->error) {
+                IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
+        } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) {
+                res = 1;
+        } else {
+                struct rt6_info *rt = (struct rt6_info *)dst;
+                int tmo = sysctl_icmpv6_time;
+
+                /* Give more bandwidth to wider prefixes. */
+                if (rt->rt6i_dst.plen < 128)
+                        tmo >>= ((128 - rt->rt6i_dst.plen)>>5);
+
+                res = xrlim_allow(dst, tmo);
+        }
+        dst_release(dst);
+        return res;
+}
+
+/*
+ *      an inline helper for the "simple" if statement below
+ *      checks if parameter problem report is caused by an
+ *      unrecognized IPv6 option that has the Option Type 
+ *      highest-order two bits set to 10
+ */
+
+static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset)
+{
+        u8 _optval, *op;
+
+        offset += skb->nh.raw - skb->data;
+        op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval);
+        if (op == NULL)
+                return 1;
+        return (*op & 0xC0) == 0x80;
+}
+
+static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len)
+{
+        struct sk_buff *skb;
+        struct icmp6hdr *icmp6h;
+        int err = 0;
+
+        if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
+                goto out;
+
+        icmp6h = (struct icmp6hdr*) skb->h.raw;
+        memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
+        icmp6h->icmp6_cksum = 0;
+
+        if (skb_queue_len(&sk->sk_write_queue) == 1) {
+                skb->csum = csum_partial((char *)icmp6h,
+                                        sizeof(struct icmp6hdr), skb->csum);
+                icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
+                                                      &fl->fl6_dst,
+                                                      len, fl->proto,
+                                                      skb->csum);
+        } else {
+                u32 tmp_csum = 0;
+
+                skb_queue_walk(&sk->sk_write_queue, skb) {
+                        tmp_csum = csum_add(tmp_csum, skb->csum);
+                }
+
+                tmp_csum = csum_partial((char *)icmp6h,
+                                        sizeof(struct icmp6hdr), tmp_csum);
+                tmp_csum = csum_ipv6_magic(&fl->fl6_src,
+                                           &fl->fl6_dst,
+                                           len, fl->proto, tmp_csum);
+                icmp6h->icmp6_cksum = tmp_csum;
+        }
+        if (icmp6h->icmp6_cksum == 0)
+                icmp6h->icmp6_cksum = -1;
+        ip6_push_pending_frames(sk);
+out:
+        return err;
+}
+
+struct icmpv6_msg {
+        struct sk_buff  *skb;
+        int             offset;
+};
+
+static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb)
+{
+        struct icmpv6_msg *msg = (struct icmpv6_msg *) from;
+        struct sk_buff *org_skb = msg->skb;
+        __u32 csum = 0;
+
+        csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset,
+                                      to, len, csum);
+        skb->csum = csum_block_add(skb->csum, csum, odd);
+        return 0;
+}
+
+/*
+ *      Send an ICMP message in response to a packet in error
+ */
+void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, 
+                 struct net_device *dev)
+{
+        struct inet6_dev *idev = NULL;
+        struct ipv6hdr *hdr = skb->nh.ipv6h;
+        struct sock *sk = icmpv6_socket->sk;
+        struct ipv6_pinfo *np = inet6_sk(sk);
+        struct in6_addr *saddr = NULL;
+        struct dst_entry *dst;
+        struct icmp6hdr tmp_hdr;
+        struct flowi fl;
+        struct icmpv6_msg msg;
+        int iif = 0;
+        int addr_type = 0;
+        int len;
+        int hlimit;
+        int err = 0;
+
+        if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail)
+                return;
+
+        /*
+         *      Make sure we respect the rules 
+         *      i.e. RFC 1885 2.4(e)
+         *      Rule (e.1) is enforced by not using icmpv6_send
+         *      in any code that processes icmp errors.
+         */
+        addr_type = ipv6_addr_type(&hdr->daddr);
+
+        if (ipv6_chk_addr(&hdr->daddr, skb->dev, 0))
+                saddr = &hdr->daddr;
+
+        /*
+         *      Dest addr check
+         */
+
+        if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) {
+                if (type != ICMPV6_PKT_TOOBIG &&
+                    !(type == ICMPV6_PARAMPROB && 
+                      code == ICMPV6_UNK_OPTION && 
+                      (opt_unrec(skb, info))))
+                        return;
+
+                saddr = NULL;
+        }
+
+        addr_type = ipv6_addr_type(&hdr->saddr);
+
+        /*
+         *      Source addr check
+         */
+
+        if (addr_type & IPV6_ADDR_LINKLOCAL)
+                iif = skb->dev->ifindex;
+
+        /*
+         *      Must not send if we know that source is Anycast also.
+         *      for now we don't know that.
+         */
+        if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
+                LIMIT_NETDEBUG(
+                        printk(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"));
+                return;
+        }
+
+        /* 
+         *      Never answer to a ICMP packet.
+         */
+        if (is_ineligible(skb)) {
+                LIMIT_NETDEBUG(
+                        printk(KERN_DEBUG "icmpv6_send: no reply to icmp error\n")); 
+                return;
+        }
+
+        memset(&fl, 0, sizeof(fl));
+        fl.proto = IPPROTO_ICMPV6;
+        ipv6_addr_copy(&fl.fl6_dst, &hdr->saddr);
+        if (saddr)
+                ipv6_addr_copy(&fl.fl6_src, saddr);
+        fl.oif = iif;
+        fl.fl_icmp_type = type;
+        fl.fl_icmp_code = code;
+
+        if (icmpv6_xmit_lock())
+                return;
+
+        if (!icmpv6_xrlim_allow(sk, type, &fl))
+                goto out;
+
+        tmp_hdr.icmp6_type = type;
+        tmp_hdr.icmp6_code = code;
+        tmp_hdr.icmp6_cksum = 0;
+        tmp_hdr.icmp6_pointer = htonl(info);
+
+        if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
+                fl.oif = np->mcast_oif;
+
+        err = ip6_dst_lookup(sk, &dst, &fl);
+        if (err)
+                goto out;
+        if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+                goto out_dst_release;
+
+        if (ipv6_addr_is_multicast(&fl.fl6_dst))
+                hlimit = np->mcast_hops;
+        else
+                hlimit = np->hop_limit;
+        if (hlimit < 0)
+                hlimit = dst_metric(dst, RTAX_HOPLIMIT);
+        if (hlimit < 0)
+                hlimit = ipv6_get_hoplimit(dst->dev);
+
+        msg.skb = skb;
+        msg.offset = skb->nh.raw - skb->data;
+
+        len = skb->len - msg.offset;
+        len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr));
+        if (len < 0) {
+                LIMIT_NETDEBUG(
+                        printk(KERN_DEBUG "icmp: len problem\n"));
+                goto out_dst_release;
+        }
+
+        idev = in6_dev_get(skb->dev);
+
+        err = ip6_append_data(sk, icmpv6_getfrag, &msg,
+                              len + sizeof(struct icmp6hdr),
+                              sizeof(struct icmp6hdr),
+                              hlimit, NULL, &fl, (struct rt6_info*)dst,
+                              MSG_DONTWAIT);
+        if (err) {
+                ip6_flush_pending_frames(sk);
+                goto out_put;
+        }
+        err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr));
+
+        if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
+                ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_OUTDESTUNREACHS, type - ICMPV6_DEST_UNREACH);
+        ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
+
+out_put:
+        if (likely(idev != NULL))
+                in6_dev_put(idev);
+out_dst_release:
+        dst_release(dst);
+out:
+        icmpv6_xmit_unlock();
+}
+
+static void icmpv6_echo_reply(struct sk_buff *skb)
+{
+        struct sock *sk = icmpv6_socket->sk;
+        struct inet6_dev *idev;
+        struct ipv6_pinfo *np = inet6_sk(sk);
+        struct in6_addr *saddr = NULL;
+        struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw;
+        struct icmp6hdr tmp_hdr;
+        struct flowi fl;
+        struct icmpv6_msg msg;
+        struct dst_entry *dst;
+        int err = 0;
+        int hlimit;
+
+        saddr = &skb->nh.ipv6h->daddr;
+
+        if (!ipv6_unicast_destination(skb))
+                saddr = NULL;
+
+        memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr));
+        tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY;
+
+        memset(&fl, 0, sizeof(fl));
+        fl.proto = IPPROTO_ICMPV6;
+        ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr);
+        if (saddr)
+                ipv6_addr_copy(&fl.fl6_src, saddr);
+        fl.oif = skb->dev->ifindex;
+        fl.fl_icmp_type = ICMPV6_ECHO_REPLY;
+
+        if (icmpv6_xmit_lock())
+                return;
+
+        if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst))
+                fl.oif = np->mcast_oif;
+
+        err = ip6_dst_lookup(sk, &dst, &fl);
+        if (err)
+                goto out;
+        if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+                goto out_dst_release;
+
+        if (ipv6_addr_is_multicast(&fl.fl6_dst))
+                hlimit = np->mcast_hops;
+        else
+                hlimit = np->hop_limit;
+        if (hlimit < 0)
+                hlimit = dst_metric(dst, RTAX_HOPLIMIT);
+        if (hlimit < 0)
+                hlimit = ipv6_get_hoplimit(dst->dev);
+
+        idev = in6_dev_get(skb->dev);
+
+        msg.skb = skb;
+        msg.offset = 0;
+
+        err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
+                                sizeof(struct icmp6hdr), hlimit, NULL, &fl,
+                                (struct rt6_info*)dst, MSG_DONTWAIT);
+
+        if (err) {
+                ip6_flush_pending_frames(sk);
+                goto out_put;
+        }
+        err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
+
+        ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTECHOREPLIES);
+        ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
+
+out_put: 
+        if (likely(idev != NULL))
+                in6_dev_put(idev);
+out_dst_release:
+        dst_release(dst);
+out: 
+        icmpv6_xmit_unlock();
+}
+
+static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info)
+{
+        struct in6_addr *saddr, *daddr;
+        struct inet6_protocol *ipprot;
+        struct sock *sk;
+        int inner_offset;
+        int hash;
+        u8 nexthdr;
+
+        if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+                return;
+
+        nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr;
+        if (ipv6_ext_hdr(nexthdr)) {
+                /* now skip over extension headers */
+                inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, skb->len - sizeof(struct ipv6hdr));
+                if (inner_offset<0)
+                        return;
+        } else {
+                inner_offset = sizeof(struct ipv6hdr);
+        }
+
+        /* Checkin header including 8 bytes of inner protocol header. */
+        if (!pskb_may_pull(skb, inner_offset+8))
+                return;
+
+        saddr = &skb->nh.ipv6h->saddr;
+        daddr = &skb->nh.ipv6h->daddr;
+
+        /* BUGGG_FUTURE: we should try to parse exthdrs in this packet.
+           Without this we will not able f.e. to make source routed
+           pmtu discovery.
+           Corresponding argument (opt) to notifiers is already added.
+           --ANK (980726)
+         */
+
+        hash = nexthdr & (MAX_INET_PROTOS - 1);
+
+        rcu_read_lock();
+        ipprot = rcu_dereference(inet6_protos[hash]);
+        if (ipprot && ipprot->err_handler)
+                ipprot->err_handler(skb, NULL, type, code, inner_offset, info);
+        rcu_read_unlock();
+
+        read_lock(&raw_v6_lock);
+        if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) {
+                while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr))) {
+                        rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
+                        sk = sk_next(sk);
+                }
+        }
+        read_unlock(&raw_v6_lock);
+}
+  
+/*
+ *      Handle icmp messages
+ */
+
+static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
+{
+        struct sk_buff *skb = *pskb;
+        struct net_device *dev = skb->dev;
+        struct inet6_dev *idev = __in6_dev_get(dev);
+        struct in6_addr *saddr, *daddr;
+        struct ipv6hdr *orig_hdr;
+        struct icmp6hdr *hdr;
+        int type;
+
+        ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INMSGS);
+
+        saddr = &skb->nh.ipv6h->saddr;
+        daddr = &skb->nh.ipv6h->daddr;
+
+        /* Perform checksum. */
+        if (skb->ip_summed == CHECKSUM_HW) {
+                skb->ip_summed = CHECKSUM_UNNECESSARY;
+                if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
+                                    skb->csum)) {
+                        LIMIT_NETDEBUG(
+                                printk(KERN_DEBUG "ICMPv6 hw checksum failed\n"));
+                        skb->ip_summed = CHECKSUM_NONE;
+                }
+        }
+        if (skb->ip_summed == CHECKSUM_NONE) {
+                if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
+                                    skb_checksum(skb, 0, skb->len, 0))) {
+                        LIMIT_NETDEBUG(
+                                printk(KERN_DEBUG "ICMPv6 checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n",
+                                       NIP6(*saddr), NIP6(*daddr)));
+                        goto discard_it;
+                }
+        }
+
+        if (!pskb_pull(skb, sizeof(struct icmp6hdr)))
+                goto discard_it;
+
+        hdr = (struct icmp6hdr *) skb->h.raw;
+
+        type = hdr->icmp6_type;
+
+        if (type >= ICMPV6_DEST_UNREACH && type <= ICMPV6_PARAMPROB)
+                ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INDESTUNREACHS, type - ICMPV6_DEST_UNREACH);
+        else if (type >= ICMPV6_ECHO_REQUEST && type <= NDISC_REDIRECT)
+                ICMP6_INC_STATS_OFFSET_BH(idev, ICMP6_MIB_INECHOS, type - ICMPV6_ECHO_REQUEST);
+
+        switch (type) {
+        case ICMPV6_ECHO_REQUEST:
+                icmpv6_echo_reply(skb);
+                break;
+
+        case ICMPV6_ECHO_REPLY:
+                /* we couldn't care less */
+                break;
+
+        case ICMPV6_PKT_TOOBIG:
+                /* BUGGG_FUTURE: if packet contains rthdr, we cannot update
+                   standard destination cache. Seems, only "advanced"
+                   destination cache will allow to solve this problem
+                   --ANK (980726)
+                 */
+                if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+                        goto discard_it;
+                hdr = (struct icmp6hdr *) skb->h.raw;
+                orig_hdr = (struct ipv6hdr *) (hdr + 1);
+                rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev,
+                                   ntohl(hdr->icmp6_mtu));
+
+                /*
+                 *      Drop through to notify
+                 */
+
+        case ICMPV6_DEST_UNREACH:
+        case ICMPV6_TIME_EXCEED:
+        case ICMPV6_PARAMPROB:
+                icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
+                break;
+
+        case NDISC_ROUTER_SOLICITATION:
+        case NDISC_ROUTER_ADVERTISEMENT:
+        case NDISC_NEIGHBOUR_SOLICITATION:
+        case NDISC_NEIGHBOUR_ADVERTISEMENT:
+        case NDISC_REDIRECT:
+                ndisc_rcv(skb);
+                break;
+
+        case ICMPV6_MGM_QUERY:
+                igmp6_event_query(skb);
+                break;
+
+        case ICMPV6_MGM_REPORT:
+                igmp6_event_report(skb);
+                break;
+
+        case ICMPV6_MGM_REDUCTION:
+        case ICMPV6_NI_QUERY:
+        case ICMPV6_NI_REPLY:
+        case ICMPV6_MLD2_REPORT:
+        case ICMPV6_DHAAD_REQUEST:
+        case ICMPV6_DHAAD_REPLY:
+        case ICMPV6_MOBILE_PREFIX_SOL:
+        case ICMPV6_MOBILE_PREFIX_ADV:
+                break;
+
+        default:
+                LIMIT_NETDEBUG(
+                        printk(KERN_DEBUG "icmpv6: msg of unknown type\n"));
+
+                /* informational */
+                if (type & ICMPV6_INFOMSG_MASK)
+                        break;
+
+                /* 
+                 * error of unknown type. 
+                 * must pass to upper level 
+                 */
+
+                icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu);
+        };
+        kfree_skb(skb);
+        return 0;
+
+discard_it:
+        ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
+        kfree_skb(skb);
+        return 0;
+}
+
+int __init icmpv6_init(struct net_proto_family *ops)
+{
+        struct sock *sk;
+        int err, i, j;
+
+        for (i = 0; i < NR_CPUS; i++) {
+                if (!cpu_possible(i))
+                        continue;
+
+                err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6,
+                                       &per_cpu(__icmpv6_socket, i));
+                if (err < 0) {
+                        printk(KERN_ERR
+                               "Failed to initialize the ICMP6 control socket "
+                               "(err %d).\n",
+                               err);
+                        goto fail;
+                }
+
+                sk = per_cpu(__icmpv6_socket, i)->sk;
+                sk->sk_allocation = GFP_ATOMIC;
+
+                /* Enough space for 2 64K ICMP packets, including
+                 * sk_buff struct overhead.
+                 */
+                sk->sk_sndbuf =
+                        (2 * ((64 * 1024) + sizeof(struct sk_buff)));
+
+                sk->sk_prot->unhash(sk);
+        }
+
+
+        if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) {
+                printk(KERN_ERR "Failed to register ICMP6 protocol\n");
+                err = -EAGAIN;
+                goto fail;
+        }
+
+        return 0;
+
+ fail:
+        for (j = 0; j < i; j++) {
+                if (!cpu_possible(j))
+                        continue;
+                sock_release(per_cpu(__icmpv6_socket, j));
+        }
+
+        return err;
+}
+
+void icmpv6_cleanup(void)
+{
+        int i;
+
+        for (i = 0; i < NR_CPUS; i++) {
+                if (!cpu_possible(i))
+                        continue;
+                sock_release(per_cpu(__icmpv6_socket, i));
+        }
+        inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
+}
+
+static struct icmp6_err {
+        int err;
+        int fatal;
+} tab_unreach[] = {
+        {       /* NOROUTE */
+                .err    = ENETUNREACH,
+                .fatal  = 0,
+        },
+        {       /* ADM_PROHIBITED */
+                .err    = EACCES,
+                .fatal  = 1,
+        },
+        {       /* Was NOT_NEIGHBOUR, now reserved */
+                .err    = EHOSTUNREACH,
+                .fatal  = 0,
+        },
+        {       /* ADDR_UNREACH */
+                .err    = EHOSTUNREACH,
+                .fatal  = 0,
+        },
+        {       /* PORT_UNREACH */
+                .err    = ECONNREFUSED,
+                .fatal  = 1,
+        },
+};
+
+int icmpv6_err_convert(int type, int code, int *err)
+{
+        int fatal = 0;
+
+        *err = EPROTO;
+
+        switch (type) {
+        case ICMPV6_DEST_UNREACH:
+                fatal = 1;
+                if (code <= ICMPV6_PORT_UNREACH) {
+                        *err  = tab_unreach[code].err;
+                        fatal = tab_unreach[code].fatal;
+                }
+                break;
+
+        case ICMPV6_PKT_TOOBIG:
+                *err = EMSGSIZE;
+                break;
+                
+        case ICMPV6_PARAMPROB:
+                *err = EPROTO;
+                fatal = 1;
+                break;
+
+        case ICMPV6_TIME_EXCEED:
+                *err = EHOSTUNREACH;
+                break;
+        };
+
+        return fatal;
+}
+
+#ifdef CONFIG_SYSCTL
+ctl_table ipv6_icmp_table[] = {
+        {
+                .ctl_name       = NET_IPV6_ICMP_RATELIMIT,
+                .procname       = "ratelimit",
+                .data           = &sysctl_icmpv6_time,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec
+        },
+        { .ctl_name = 0 },
+};
+#endif
+