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Diffstat (limited to 'net/ipv6/icmp.c')
-rw-r--r--net/ipv6/icmp.c966
1 files changed, 966 insertions, 0 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
new file mode 100644
index 00000000..03e62f94
--- /dev/null
+++ b/net/ipv6/icmp.c
@@ -0,0 +1,966 @@
+/*
+ * Internet Control Message Protocol (ICMPv6)
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * 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/sockios.h>
+#include <linux/net.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/netfilter.h>
+#include <linux/slab.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 <net/xfrm.h>
+#include <net/inet_common.h>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+/*
+ * 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 inline struct sock *icmpv6_sk(struct net *net)
+{
+ return net->ipv6.icmp_sk[smp_processor_id()];
+}
+
+static int icmpv6_rcv(struct sk_buff *skb);
+
+static const struct inet6_protocol icmpv6_protocol = {
+ .handler = icmpv6_rcv,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+static __inline__ struct sock *icmpv6_xmit_lock(struct net *net)
+{
+ struct sock *sk;
+
+ local_bh_disable();
+
+ sk = icmpv6_sk(net);
+ if (unlikely(!spin_trylock(&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 NULL;
+ }
+ return sk;
+}
+
+static __inline__ void icmpv6_xmit_unlock(struct sock *sk)
+{
+ spin_unlock_bh(&sk->sk_lock.slock);
+}
+
+/*
+ * Slightly more convenient version of icmpv6_send.
+ */
+void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
+{
+ icmpv6_send(skb, ICMPV6_PARAMPROB, code, pos);
+ 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 *)(ipv6_hdr(skb) + 1) - skb->data;
+ int len = skb->len - ptr;
+ __u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+
+ if (len < 0)
+ return 1;
+
+ ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr);
+ 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;
+}
+
+/*
+ * Check the ICMP output rate limit
+ */
+static inline int icmpv6_xrlim_allow(struct sock *sk, u8 type,
+ struct flowi *fl)
+{
+ struct dst_entry *dst;
+ struct net *net = sock_net(sk);
+ 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(net, sk, fl);
+ if (dst->error) {
+ IP6_INC_STATS(net, ip6_dst_idev(dst),
+ 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 = net->ipv6.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_network_offset(skb);
+ 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 = icmp6_hdr(skb);
+ memcpy(icmp6h, thdr, sizeof(struct icmp6hdr));
+ icmp6h->icmp6_cksum = 0;
+
+ if (skb_queue_len(&sk->sk_write_queue) == 1) {
+ skb->csum = csum_partial(icmp6h,
+ sizeof(struct icmp6hdr), skb->csum);
+ icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
+ &fl->fl6_dst,
+ len, fl->proto,
+ skb->csum);
+ } else {
+ __wsum tmp_csum = 0;
+
+ skb_queue_walk(&sk->sk_write_queue, skb) {
+ tmp_csum = csum_add(tmp_csum, skb->csum);
+ }
+
+ tmp_csum = csum_partial(icmp6h,
+ sizeof(struct icmp6hdr), tmp_csum);
+ icmp6h->icmp6_cksum = csum_ipv6_magic(&fl->fl6_src,
+ &fl->fl6_dst,
+ len, fl->proto,
+ tmp_csum);
+ }
+ ip6_push_pending_frames(sk);
+out:
+ return err;
+}
+
+struct icmpv6_msg {
+ struct sk_buff *skb;
+ int offset;
+ uint8_t type;
+};
+
+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;
+ __wsum 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);
+ if (!(msg->type & ICMPV6_INFOMSG_MASK))
+ nf_ct_attach(skb, org_skb);
+ return 0;
+}
+
+#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
+static void mip6_addr_swap(struct sk_buff *skb)
+{
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+ struct ipv6_destopt_hao *hao;
+ struct in6_addr tmp;
+ int off;
+
+ if (opt->dsthao) {
+ off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
+ if (likely(off >= 0)) {
+ hao = (struct ipv6_destopt_hao *)
+ (skb_network_header(skb) + off);
+ ipv6_addr_copy(&tmp, &iph->saddr);
+ ipv6_addr_copy(&iph->saddr, &hao->addr);
+ ipv6_addr_copy(&hao->addr, &tmp);
+ }
+ }
+}
+#else
+static inline void mip6_addr_swap(struct sk_buff *skb) {}
+#endif
+
+/*
+ * Send an ICMP message in response to a packet in error
+ */
+void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
+{
+ struct net *net = dev_net(skb->dev);
+ struct inet6_dev *idev = NULL;
+ struct ipv6hdr *hdr = ipv6_hdr(skb);
+ struct sock *sk;
+ struct ipv6_pinfo *np;
+ struct in6_addr *saddr = NULL;
+ struct dst_entry *dst;
+ struct dst_entry *dst2;
+ struct icmp6hdr tmp_hdr;
+ struct flowi fl;
+ struct flowi fl2;
+ struct icmpv6_msg msg;
+ int iif = 0;
+ int addr_type = 0;
+ int len;
+ int hlimit;
+ int err = 0;
+
+ if ((u8 *)hdr < skb->head ||
+ (skb->network_header + sizeof(*hdr)) > 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(net, &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 error if the source does not uniquely
+ * identify a single node (RFC2463 Section 2.4).
+ * We check unspecified / multicast addresses here,
+ * and anycast addresses will be checked later.
+ */
+ if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) {
+ LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n");
+ return;
+ }
+
+ /*
+ * Never answer to a ICMP packet.
+ */
+ if (is_ineligible(skb)) {
+ LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n");
+ return;
+ }
+
+ mip6_addr_swap(skb);
+
+ 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;
+ security_skb_classify_flow(skb, &fl);
+
+ sk = icmpv6_xmit_lock(net);
+ if (sk == NULL)
+ return;
+ np = inet6_sk(sk);
+
+ 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;
+
+ /*
+ * We won't send icmp if the destination is known
+ * anycast.
+ */
+ if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) {
+ LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n");
+ goto out_dst_release;
+ }
+
+ /* No need to clone since we're just using its address. */
+ dst2 = dst;
+
+ err = xfrm_lookup(net, &dst, &fl, sk, 0);
+ switch (err) {
+ case 0:
+ if (dst != dst2)
+ goto route_done;
+ break;
+ case -EPERM:
+ dst = NULL;
+ break;
+ default:
+ goto out;
+ }
+
+ if (xfrm_decode_session_reverse(skb, &fl2, AF_INET6))
+ goto relookup_failed;
+
+ if (ip6_dst_lookup(sk, &dst2, &fl2))
+ goto relookup_failed;
+
+ err = xfrm_lookup(net, &dst2, &fl2, sk, XFRM_LOOKUP_ICMP);
+ switch (err) {
+ case 0:
+ dst_release(dst);
+ dst = dst2;
+ break;
+ case -EPERM:
+ goto out_dst_release;
+ default:
+relookup_failed:
+ if (!dst)
+ goto out;
+ break;
+ }
+
+route_done:
+ if (ipv6_addr_is_multicast(&fl.fl6_dst))
+ hlimit = np->mcast_hops;
+ else
+ hlimit = np->hop_limit;
+ if (hlimit < 0)
+ hlimit = ip6_dst_hoplimit(dst);
+
+ msg.skb = skb;
+ msg.offset = skb_network_offset(skb);
+ msg.type = type;
+
+ 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(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,
+ np->tclass, NULL, &fl, (struct rt6_info*)dst,
+ MSG_DONTWAIT, np->dontfrag);
+ if (err) {
+ ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
+ ip6_flush_pending_frames(sk);
+ goto out_put;
+ }
+ err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, len + sizeof(struct icmp6hdr));
+
+out_put:
+ if (likely(idev != NULL))
+ in6_dev_put(idev);
+out_dst_release:
+ dst_release(dst);
+out:
+ icmpv6_xmit_unlock(sk);
+}
+
+EXPORT_SYMBOL(icmpv6_send);
+
+static void icmpv6_echo_reply(struct sk_buff *skb)
+{
+ struct net *net = dev_net(skb->dev);
+ struct sock *sk;
+ struct inet6_dev *idev;
+ struct ipv6_pinfo *np;
+ struct in6_addr *saddr = NULL;
+ struct icmp6hdr *icmph = icmp6_hdr(skb);
+ struct icmp6hdr tmp_hdr;
+ struct flowi fl;
+ struct icmpv6_msg msg;
+ struct dst_entry *dst;
+ int err = 0;
+ int hlimit;
+
+ saddr = &ipv6_hdr(skb)->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, &ipv6_hdr(skb)->saddr);
+ if (saddr)
+ ipv6_addr_copy(&fl.fl6_src, saddr);
+ fl.oif = skb->dev->ifindex;
+ fl.fl_icmp_type = ICMPV6_ECHO_REPLY;
+ security_skb_classify_flow(skb, &fl);
+
+ sk = icmpv6_xmit_lock(net);
+ if (sk == NULL)
+ return;
+ np = inet6_sk(sk);
+
+ 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(net, &dst, &fl, sk, 0)) < 0)
+ goto out;
+
+ if (ipv6_addr_is_multicast(&fl.fl6_dst))
+ hlimit = np->mcast_hops;
+ else
+ hlimit = np->hop_limit;
+ if (hlimit < 0)
+ hlimit = ip6_dst_hoplimit(dst);
+
+ idev = in6_dev_get(skb->dev);
+
+ msg.skb = skb;
+ msg.offset = 0;
+ msg.type = ICMPV6_ECHO_REPLY;
+
+ err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr),
+ sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl,
+ (struct rt6_info*)dst, MSG_DONTWAIT,
+ np->dontfrag);
+
+ if (err) {
+ ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS);
+ ip6_flush_pending_frames(sk);
+ goto out_put;
+ }
+ err = icmpv6_push_pending_frames(sk, &fl, &tmp_hdr, skb->len + sizeof(struct icmp6hdr));
+
+out_put:
+ if (likely(idev != NULL))
+ in6_dev_put(idev);
+ dst_release(dst);
+out:
+ icmpv6_xmit_unlock(sk);
+}
+
+static void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info)
+{
+ const struct inet6_protocol *ipprot;
+ 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);
+ 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;
+
+ /* 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();
+
+ raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info);
+}
+
+/*
+ * Handle icmp messages
+ */
+
+static int icmpv6_rcv(struct sk_buff *skb)
+{
+ 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;
+ u8 type;
+
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ struct sec_path *sp = skb_sec_path(skb);
+ int nh;
+
+ if (!(sp && sp->xvec[sp->len - 1]->props.flags &
+ XFRM_STATE_ICMP))
+ goto drop_no_count;
+
+ if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr)))
+ goto drop_no_count;
+
+ nh = skb_network_offset(skb);
+ skb_set_network_header(skb, sizeof(*hdr));
+
+ if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb))
+ goto drop_no_count;
+
+ skb_set_network_header(skb, nh);
+ }
+
+ ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS);
+
+ saddr = &ipv6_hdr(skb)->saddr;
+ daddr = &ipv6_hdr(skb)->daddr;
+
+ /* Perform checksum. */
+ switch (skb->ip_summed) {
+ case CHECKSUM_COMPLETE:
+ if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6,
+ skb->csum))
+ break;
+ /* fall through */
+ case CHECKSUM_NONE:
+ skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len,
+ IPPROTO_ICMPV6, 0));
+ if (__skb_checksum_complete(skb)) {
+ LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [%pI6 > %pI6]\n",
+ saddr, daddr);
+ goto discard_it;
+ }
+ }
+
+ if (!pskb_pull(skb, sizeof(*hdr)))
+ goto discard_it;
+
+ hdr = icmp6_hdr(skb);
+
+ type = hdr->icmp6_type;
+
+ ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type);
+
+ 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 = icmp6_hdr(skb);
+ 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(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(dev_net(dev), idev, ICMP6_MIB_INERRORS);
+drop_no_count:
+ kfree_skb(skb);
+ return 0;
+}
+
+void icmpv6_flow_init(struct sock *sk, struct flowi *fl,
+ u8 type,
+ const struct in6_addr *saddr,
+ const struct in6_addr *daddr,
+ int oif)
+{
+ memset(fl, 0, sizeof(*fl));
+ ipv6_addr_copy(&fl->fl6_src, saddr);
+ ipv6_addr_copy(&fl->fl6_dst, daddr);
+ fl->proto = IPPROTO_ICMPV6;
+ fl->fl_icmp_type = type;
+ fl->fl_icmp_code = 0;
+ fl->oif = oif;
+ security_sk_classify_flow(sk, fl);
+}
+
+/*
+ * Special lock-class for __icmpv6_sk:
+ */
+static struct lock_class_key icmpv6_socket_sk_dst_lock_key;
+
+static int __net_init icmpv6_sk_init(struct net *net)
+{
+ struct sock *sk;
+ int err, i, j;
+
+ net->ipv6.icmp_sk =
+ kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL);
+ if (net->ipv6.icmp_sk == NULL)
+ return -ENOMEM;
+
+ for_each_possible_cpu(i) {
+ err = inet_ctl_sock_create(&sk, PF_INET6,
+ SOCK_RAW, IPPROTO_ICMPV6, net);
+ if (err < 0) {
+ printk(KERN_ERR
+ "Failed to initialize the ICMP6 control socket "
+ "(err %d).\n",
+ err);
+ goto fail;
+ }
+
+ net->ipv6.icmp_sk[i] = sk;
+
+ /*
+ * Split off their lock-class, because sk->sk_dst_lock
+ * gets used from softirqs, which is safe for
+ * __icmpv6_sk (because those never get directly used
+ * via userspace syscalls), but unsafe for normal sockets.
+ */
+ lockdep_set_class(&sk->sk_dst_lock,
+ &icmpv6_socket_sk_dst_lock_key);
+
+ /* Enough space for 2 64K ICMP packets, including
+ * sk_buff struct overhead.
+ */
+ sk->sk_sndbuf =
+ (2 * ((64 * 1024) + sizeof(struct sk_buff)));
+ }
+ return 0;
+
+ fail:
+ for (j = 0; j < i; j++)
+ inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]);
+ kfree(net->ipv6.icmp_sk);
+ return err;
+}
+
+static void __net_exit icmpv6_sk_exit(struct net *net)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]);
+ }
+ kfree(net->ipv6.icmp_sk);
+}
+
+static struct pernet_operations icmpv6_sk_ops = {
+ .init = icmpv6_sk_init,
+ .exit = icmpv6_sk_exit,
+};
+
+int __init icmpv6_init(void)
+{
+ int err;
+
+ err = register_pernet_subsys(&icmpv6_sk_ops);
+ if (err < 0)
+ return err;
+
+ err = -EAGAIN;
+ if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0)
+ goto fail;
+ return 0;
+
+fail:
+ printk(KERN_ERR "Failed to register ICMP6 protocol\n");
+ unregister_pernet_subsys(&icmpv6_sk_ops);
+ return err;
+}
+
+void icmpv6_cleanup(void)
+{
+ unregister_pernet_subsys(&icmpv6_sk_ops);
+ inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6);
+}
+
+
+static const 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(u8 type, u8 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;
+}
+
+EXPORT_SYMBOL(icmpv6_err_convert);
+
+#ifdef CONFIG_SYSCTL
+ctl_table ipv6_icmp_table_template[] = {
+ {
+ .procname = "ratelimit",
+ .data = &init_net.ipv6.sysctl.icmpv6_time,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_ms_jiffies,
+ },
+ { },
+};
+
+struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
+{
+ struct ctl_table *table;
+
+ table = kmemdup(ipv6_icmp_table_template,
+ sizeof(ipv6_icmp_table_template),
+ GFP_KERNEL);
+
+ if (table)
+ table[0].data = &net->ipv6.sysctl.icmpv6_time;
+
+ return table;
+}
+#endif
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 09:15:29 +0000