Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Internet Control Message Protocol (ICMPv6) |
| 3 | * Linux INET6 implementation |
| 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Based on net/ipv4/icmp.c |
| 9 | * |
| 10 | * RFC 1885 |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | /* |
| 19 | * Changes: |
| 20 | * |
| 21 | * Andi Kleen : exception handling |
| 22 | * Andi Kleen add rate limits. never reply to a icmp. |
| 23 | * add more length checks and other fixes. |
| 24 | * yoshfuji : ensure to sent parameter problem for |
| 25 | * fragments. |
| 26 | * YOSHIFUJI Hideaki @USAGI: added sysctl for icmp rate limit. |
| 27 | * Randy Dunlap and |
| 28 | * YOSHIFUJI Hideaki @USAGI: Per-interface statistics support |
| 29 | * Kazunori MIYAZAWA @USAGI: change output process to use ip6_append_data |
| 30 | */ |
| 31 | |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 32 | #define pr_fmt(fmt) "IPv6: " fmt |
| 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/module.h> |
| 35 | #include <linux/errno.h> |
| 36 | #include <linux/types.h> |
| 37 | #include <linux/socket.h> |
| 38 | #include <linux/in.h> |
| 39 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include <linux/sockios.h> |
| 41 | #include <linux/net.h> |
| 42 | #include <linux/skbuff.h> |
| 43 | #include <linux/init.h> |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 44 | #include <linux/netfilter.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 45 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | #ifdef CONFIG_SYSCTL |
| 48 | #include <linux/sysctl.h> |
| 49 | #endif |
| 50 | |
| 51 | #include <linux/inet.h> |
| 52 | #include <linux/netdevice.h> |
| 53 | #include <linux/icmpv6.h> |
| 54 | |
| 55 | #include <net/ip.h> |
| 56 | #include <net/sock.h> |
| 57 | |
| 58 | #include <net/ipv6.h> |
| 59 | #include <net/ip6_checksum.h> |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 60 | #include <net/ping.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <net/protocol.h> |
| 62 | #include <net/raw.h> |
| 63 | #include <net/rawv6.h> |
| 64 | #include <net/transp_v6.h> |
| 65 | #include <net/ip6_route.h> |
| 66 | #include <net/addrconf.h> |
| 67 | #include <net/icmp.h> |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 68 | #include <net/xfrm.h> |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 69 | #include <net/inet_common.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
| 71 | #include <asm/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | /* |
| 74 | * The ICMP socket(s). This is the most convenient way to flow control |
| 75 | * our ICMP output as well as maintain a clean interface throughout |
| 76 | * all layers. All Socketless IP sends will soon be gone. |
| 77 | * |
| 78 | * On SMP we have one ICMP socket per-cpu. |
| 79 | */ |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 80 | static inline struct sock *icmpv6_sk(struct net *net) |
| 81 | { |
| 82 | return net->ipv6.icmp_sk[smp_processor_id()]; |
| 83 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Steffen Klassert | 6f809da | 2013-01-16 22:09:49 +0000 | [diff] [blame] | 85 | static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 86 | u8 type, u8 code, int offset, __be32 info) |
| 87 | { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 88 | /* icmpv6_notify checks 8 bytes can be pulled, icmp6hdr is 8 bytes */ |
| 89 | struct icmp6hdr *icmp6 = (struct icmp6hdr *) (skb->data + offset); |
Steffen Klassert | 6f809da | 2013-01-16 22:09:49 +0000 | [diff] [blame] | 90 | struct net *net = dev_net(skb->dev); |
| 91 | |
| 92 | if (type == ICMPV6_PKT_TOOBIG) |
| 93 | ip6_update_pmtu(skb, net, info, 0, 0); |
| 94 | else if (type == NDISC_REDIRECT) |
| 95 | ip6_redirect(skb, net, 0, 0); |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 96 | |
| 97 | if (!(type & ICMPV6_INFOMSG_MASK)) |
| 98 | if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) |
| 99 | ping_err(skb, offset, info); |
Steffen Klassert | 6f809da | 2013-01-16 22:09:49 +0000 | [diff] [blame] | 100 | } |
| 101 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 102 | static int icmpv6_rcv(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 104 | static const struct inet6_protocol icmpv6_protocol = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | .handler = icmpv6_rcv, |
Steffen Klassert | 6f809da | 2013-01-16 22:09:49 +0000 | [diff] [blame] | 106 | .err_handler = icmpv6_err, |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 107 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | }; |
| 109 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 110 | static __inline__ struct sock *icmpv6_xmit_lock(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 112 | struct sock *sk; |
| 113 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | local_bh_disable(); |
| 115 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 116 | sk = icmpv6_sk(net); |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 117 | if (unlikely(!spin_trylock(&sk->sk_lock.slock))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | /* This can happen if the output path (f.e. SIT or |
| 119 | * ip6ip6 tunnel) signals dst_link_failure() for an |
| 120 | * outgoing ICMP6 packet. |
| 121 | */ |
| 122 | local_bh_enable(); |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 123 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | } |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 125 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
| 127 | |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 128 | static __inline__ void icmpv6_xmit_unlock(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | { |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 130 | spin_unlock_bh(&sk->sk_lock.slock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 133 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | * Figure out, may we reply to this packet with icmp error. |
| 135 | * |
| 136 | * We do not reply, if: |
| 137 | * - it was icmp error message. |
| 138 | * - it is truncated, so that it is known, that protocol is ICMPV6 |
| 139 | * (i.e. in the middle of some exthdr) |
| 140 | * |
| 141 | * --ANK (980726) |
| 142 | */ |
| 143 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 144 | static bool is_ineligible(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 146 | int ptr = (u8 *)(ipv6_hdr(skb) + 1) - skb->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | int len = skb->len - ptr; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 148 | __u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 149 | __be16 frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
| 151 | if (len < 0) |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 152 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 154 | ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, &frag_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | if (ptr < 0) |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 156 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | if (nexthdr == IPPROTO_ICMPV6) { |
| 158 | u8 _type, *tp; |
| 159 | tp = skb_header_pointer(skb, |
| 160 | ptr+offsetof(struct icmp6hdr, icmp6_type), |
| 161 | sizeof(_type), &_type); |
| 162 | if (tp == NULL || |
| 163 | !(*tp & ICMPV6_INFOMSG_MASK)) |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 164 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | } |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 166 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | } |
| 168 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 169 | /* |
| 170 | * Check the ICMP output rate limit |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 172 | static inline bool icmpv6_xrlim_allow(struct sock *sk, u8 type, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 173 | struct flowi6 *fl6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | { |
| 175 | struct dst_entry *dst; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 176 | struct net *net = sock_net(sk); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 177 | bool res = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | /* Informational messages are not limited. */ |
| 180 | if (type & ICMPV6_INFOMSG_MASK) |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 181 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | /* Do not limit pmtu discovery, it would break it. */ |
| 184 | if (type == ICMPV6_PKT_TOOBIG) |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 185 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 187 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | * Look up the output route. |
| 189 | * XXX: perhaps the expire for routing entries cloned by |
| 190 | * this lookup should be more aggressive (not longer than timeout). |
| 191 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 192 | dst = ip6_route_output(net, sk, fl6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | if (dst->error) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 194 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 195 | IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | } else if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) { |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 197 | res = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } else { |
| 199 | struct rt6_info *rt = (struct rt6_info *)dst; |
Benjamin Thery | 9a43b70 | 2008-03-05 10:49:18 -0800 | [diff] [blame] | 200 | int tmo = net->ipv6.sysctl.icmpv6_time; |
David S. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 201 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
| 203 | /* Give more bandwidth to wider prefixes. */ |
| 204 | if (rt->rt6i_dst.plen < 128) |
| 205 | tmo >>= ((128 - rt->rt6i_dst.plen)>>5); |
| 206 | |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 207 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
David S. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 208 | res = inet_peer_xrlim_allow(peer, tmo); |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 209 | if (peer) |
| 210 | inet_putpeer(peer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | dst_release(dst); |
| 213 | return res; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * an inline helper for the "simple" if statement below |
| 218 | * checks if parameter problem report is caused by an |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 219 | * unrecognized IPv6 option that has the Option Type |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | * highest-order two bits set to 10 |
| 221 | */ |
| 222 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 223 | static bool opt_unrec(struct sk_buff *skb, __u32 offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | { |
| 225 | u8 _optval, *op; |
| 226 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 227 | offset += skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | op = skb_header_pointer(skb, offset, sizeof(_optval), &_optval); |
| 229 | if (op == NULL) |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 230 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | return (*op & 0xC0) == 0x80; |
| 232 | } |
| 233 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 234 | int icmpv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, |
| 235 | struct icmp6hdr *thdr, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | { |
| 237 | struct sk_buff *skb; |
| 238 | struct icmp6hdr *icmp6h; |
| 239 | int err = 0; |
| 240 | |
| 241 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) |
| 242 | goto out; |
| 243 | |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 244 | icmp6h = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | memcpy(icmp6h, thdr, sizeof(struct icmp6hdr)); |
| 246 | icmp6h->icmp6_cksum = 0; |
| 247 | |
| 248 | if (skb_queue_len(&sk->sk_write_queue) == 1) { |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 249 | skb->csum = csum_partial(icmp6h, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | sizeof(struct icmp6hdr), skb->csum); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 251 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
| 252 | &fl6->daddr, |
| 253 | len, fl6->flowi6_proto, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | skb->csum); |
| 255 | } else { |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 256 | __wsum tmp_csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
| 258 | skb_queue_walk(&sk->sk_write_queue, skb) { |
| 259 | tmp_csum = csum_add(tmp_csum, skb->csum); |
| 260 | } |
| 261 | |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 262 | tmp_csum = csum_partial(icmp6h, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | sizeof(struct icmp6hdr), tmp_csum); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 264 | icmp6h->icmp6_cksum = csum_ipv6_magic(&fl6->saddr, |
| 265 | &fl6->daddr, |
| 266 | len, fl6->flowi6_proto, |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 267 | tmp_csum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | ip6_push_pending_frames(sk); |
| 270 | out: |
| 271 | return err; |
| 272 | } |
| 273 | |
| 274 | struct icmpv6_msg { |
| 275 | struct sk_buff *skb; |
| 276 | int offset; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 277 | uint8_t type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | }; |
| 279 | |
| 280 | static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) |
| 281 | { |
| 282 | struct icmpv6_msg *msg = (struct icmpv6_msg *) from; |
| 283 | struct sk_buff *org_skb = msg->skb; |
Al Viro | 5f92a73 | 2006-11-14 21:36:54 -0800 | [diff] [blame] | 284 | __wsum csum = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | |
| 286 | csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, |
| 287 | to, len, csum); |
| 288 | skb->csum = csum_block_add(skb->csum, csum, odd); |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 289 | if (!(msg->type & ICMPV6_INFOMSG_MASK)) |
| 290 | nf_ct_attach(skb, org_skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | return 0; |
| 292 | } |
| 293 | |
Amerigo Wang | 07a9362 | 2012-10-29 16:23:10 +0000 | [diff] [blame] | 294 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 295 | static void mip6_addr_swap(struct sk_buff *skb) |
| 296 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 297 | struct ipv6hdr *iph = ipv6_hdr(skb); |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 298 | struct inet6_skb_parm *opt = IP6CB(skb); |
| 299 | struct ipv6_destopt_hao *hao; |
| 300 | struct in6_addr tmp; |
| 301 | int off; |
| 302 | |
| 303 | if (opt->dsthao) { |
| 304 | off = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO); |
| 305 | if (likely(off >= 0)) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 306 | hao = (struct ipv6_destopt_hao *) |
| 307 | (skb_network_header(skb) + off); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 308 | tmp = iph->saddr; |
| 309 | iph->saddr = hao->addr; |
| 310 | hao->addr = tmp; |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 311 | } |
| 312 | } |
| 313 | } |
| 314 | #else |
| 315 | static inline void mip6_addr_swap(struct sk_buff *skb) {} |
| 316 | #endif |
| 317 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 318 | struct dst_entry *icmpv6_route_lookup(struct net *net, struct sk_buff *skb, |
| 319 | struct sock *sk, struct flowi6 *fl6) |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 320 | { |
| 321 | struct dst_entry *dst, *dst2; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 322 | struct flowi6 fl2; |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 323 | int err; |
| 324 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 325 | err = ip6_dst_lookup(sk, &dst, fl6); |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 326 | if (err) |
| 327 | return ERR_PTR(err); |
| 328 | |
| 329 | /* |
| 330 | * We won't send icmp if the destination is known |
| 331 | * anycast. |
| 332 | */ |
| 333 | if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 334 | LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: acast source\n"); |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 335 | dst_release(dst); |
| 336 | return ERR_PTR(-EINVAL); |
| 337 | } |
| 338 | |
| 339 | /* No need to clone since we're just using its address. */ |
| 340 | dst2 = dst; |
| 341 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 342 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), sk, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 343 | if (!IS_ERR(dst)) { |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 344 | if (dst != dst2) |
| 345 | return dst; |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 346 | } else { |
| 347 | if (PTR_ERR(dst) == -EPERM) |
| 348 | dst = NULL; |
| 349 | else |
| 350 | return dst; |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 351 | } |
| 352 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 353 | err = xfrm_decode_session_reverse(skb, flowi6_to_flowi(&fl2), AF_INET6); |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 354 | if (err) |
| 355 | goto relookup_failed; |
| 356 | |
| 357 | err = ip6_dst_lookup(sk, &dst2, &fl2); |
| 358 | if (err) |
| 359 | goto relookup_failed; |
| 360 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 361 | dst2 = xfrm_lookup(net, dst2, flowi6_to_flowi(&fl2), sk, XFRM_LOOKUP_ICMP); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 362 | if (!IS_ERR(dst2)) { |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 363 | dst_release(dst); |
| 364 | dst = dst2; |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 365 | } else { |
| 366 | err = PTR_ERR(dst2); |
| 367 | if (err == -EPERM) { |
| 368 | dst_release(dst); |
| 369 | return dst2; |
| 370 | } else |
| 371 | goto relookup_failed; |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | relookup_failed: |
| 375 | if (dst) |
| 376 | return dst; |
| 377 | return ERR_PTR(err); |
| 378 | } |
| 379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | /* |
| 381 | * Send an ICMP message in response to a packet in error |
| 382 | */ |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 383 | static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 385 | struct net *net = dev_net(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | struct inet6_dev *idev = NULL; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 387 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 388 | struct sock *sk; |
| 389 | struct ipv6_pinfo *np; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 390 | const struct in6_addr *saddr = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | struct dst_entry *dst; |
| 392 | struct icmp6hdr tmp_hdr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 393 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | struct icmpv6_msg msg; |
| 395 | int iif = 0; |
| 396 | int addr_type = 0; |
| 397 | int len; |
Gerrit Renker | e651f03 | 2009-08-09 08:12:48 +0000 | [diff] [blame] | 398 | int hlimit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | int err = 0; |
| 400 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 401 | if ((u8 *)hdr < skb->head || |
Simon Horman | 29a3cad | 2013-05-28 20:34:26 +0000 | [diff] [blame] | 402 | (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | return; |
| 404 | |
| 405 | /* |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 406 | * Make sure we respect the rules |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | * i.e. RFC 1885 2.4(e) |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 408 | * Rule (e.1) is enforced by not using icmp6_send |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | * in any code that processes icmp errors. |
| 410 | */ |
| 411 | addr_type = ipv6_addr_type(&hdr->daddr); |
| 412 | |
Benjamin Thery | 9a43b70 | 2008-03-05 10:49:18 -0800 | [diff] [blame] | 413 | if (ipv6_chk_addr(net, &hdr->daddr, skb->dev, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | saddr = &hdr->daddr; |
| 415 | |
| 416 | /* |
| 417 | * Dest addr check |
| 418 | */ |
| 419 | |
| 420 | if ((addr_type & IPV6_ADDR_MULTICAST || skb->pkt_type != PACKET_HOST)) { |
| 421 | if (type != ICMPV6_PKT_TOOBIG && |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 422 | !(type == ICMPV6_PARAMPROB && |
| 423 | code == ICMPV6_UNK_OPTION && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | (opt_unrec(skb, info)))) |
| 425 | return; |
| 426 | |
| 427 | saddr = NULL; |
| 428 | } |
| 429 | |
| 430 | addr_type = ipv6_addr_type(&hdr->saddr); |
| 431 | |
| 432 | /* |
| 433 | * Source addr check |
| 434 | */ |
| 435 | |
Hannes Frederic Sowa | 842df07 | 2013-03-08 02:07:19 +0000 | [diff] [blame] | 436 | if (__ipv6_addr_needs_scope_id(addr_type)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | iif = skb->dev->ifindex; |
| 438 | |
| 439 | /* |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 440 | * Must not send error if the source does not uniquely |
| 441 | * identify a single node (RFC2463 Section 2.4). |
| 442 | * We check unspecified / multicast addresses here, |
| 443 | * and anycast addresses will be checked later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | */ |
| 445 | if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 446 | LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: addr_any/mcast source\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | return; |
| 448 | } |
| 449 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 450 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | * Never answer to a ICMP packet. |
| 452 | */ |
| 453 | if (is_ineligible(skb)) { |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 454 | LIMIT_NETDEBUG(KERN_DEBUG "icmp6_send: no reply to icmp error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | return; |
| 456 | } |
| 457 | |
Masahide NAKAMURA | 7938323 | 2006-08-23 19:27:25 -0700 | [diff] [blame] | 458 | mip6_addr_swap(skb); |
| 459 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 460 | memset(&fl6, 0, sizeof(fl6)); |
| 461 | fl6.flowi6_proto = IPPROTO_ICMPV6; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 462 | fl6.daddr = hdr->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | if (saddr) |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 464 | fl6.saddr = *saddr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 465 | fl6.flowi6_oif = iif; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 466 | fl6.fl6_icmp_type = type; |
| 467 | fl6.fl6_icmp_code = code; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 468 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 470 | sk = icmpv6_xmit_lock(net); |
| 471 | if (sk == NULL) |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 472 | return; |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 473 | np = inet6_sk(sk); |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 474 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 475 | if (!icmpv6_xrlim_allow(sk, type, &fl6)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | goto out; |
| 477 | |
| 478 | tmp_hdr.icmp6_type = type; |
| 479 | tmp_hdr.icmp6_code = code; |
| 480 | tmp_hdr.icmp6_cksum = 0; |
| 481 | tmp_hdr.icmp6_pointer = htonl(info); |
| 482 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 483 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
| 484 | fl6.flowi6_oif = np->mcast_oif; |
Erich E. Hoover | c4062df | 2012-02-08 09:11:08 +0000 | [diff] [blame] | 485 | else if (!fl6.flowi6_oif) |
| 486 | fl6.flowi6_oif = np->ucast_oif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 488 | dst = icmpv6_route_lookup(net, skb, sk, &fl6); |
David S. Miller | b42835d | 2011-03-01 22:06:22 -0800 | [diff] [blame] | 489 | if (IS_ERR(dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | goto out; |
YOSHIFUJI Hideaki | 8de3351 | 2005-12-21 22:57:06 +0900 | [diff] [blame] | 491 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 492 | if (ipv6_addr_is_multicast(&fl6.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | hlimit = np->mcast_hops; |
| 494 | else |
| 495 | hlimit = np->hop_limit; |
| 496 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 497 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | msg.skb = skb; |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 500 | msg.offset = skb_network_offset(skb); |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 501 | msg.type = type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | |
| 503 | len = skb->len - msg.offset; |
| 504 | len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); |
| 505 | if (len < 0) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 506 | LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | goto out_dst_release; |
| 508 | } |
| 509 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 510 | rcu_read_lock(); |
| 511 | idev = __in6_dev_get(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
| 513 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, |
| 514 | len + sizeof(struct icmp6hdr), |
Gerrit Renker | e651f03 | 2009-08-09 08:12:48 +0000 | [diff] [blame] | 515 | sizeof(struct icmp6hdr), hlimit, |
Eldad Zack | a2d91a0 | 2012-04-01 07:49:07 +0000 | [diff] [blame] | 516 | np->tclass, NULL, &fl6, (struct rt6_info *)dst, |
Brian Haley | 13b52cd | 2010-04-23 11:26:08 +0000 | [diff] [blame] | 517 | MSG_DONTWAIT, np->dontfrag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | if (err) { |
Eric Dumazet | 00d9d6a | 2010-06-07 22:24:44 +0000 | [diff] [blame] | 519 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | ip6_flush_pending_frames(sk); |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 521 | } else { |
| 522 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, |
| 523 | len + sizeof(struct icmp6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | } |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 525 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | out_dst_release: |
| 527 | dst_release(dst); |
| 528 | out: |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 529 | icmpv6_xmit_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | } |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 531 | |
| 532 | /* Slightly more convenient version of icmp6_send. |
| 533 | */ |
| 534 | void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) |
| 535 | { |
| 536 | icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); |
| 537 | kfree_skb(skb); |
| 538 | } |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | static void icmpv6_echo_reply(struct sk_buff *skb) |
| 541 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 542 | struct net *net = dev_net(skb->dev); |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 543 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | struct inet6_dev *idev; |
YOSHIFUJI Hideaki | 84427d5 | 2005-06-13 14:59:44 -0700 | [diff] [blame] | 545 | struct ipv6_pinfo *np; |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 546 | const struct in6_addr *saddr = NULL; |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 547 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | struct icmp6hdr tmp_hdr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 549 | struct flowi6 fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | struct icmpv6_msg msg; |
| 551 | struct dst_entry *dst; |
| 552 | int err = 0; |
| 553 | int hlimit; |
| 554 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 555 | saddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
| 557 | if (!ipv6_unicast_destination(skb)) |
| 558 | saddr = NULL; |
| 559 | |
| 560 | memcpy(&tmp_hdr, icmph, sizeof(tmp_hdr)); |
| 561 | tmp_hdr.icmp6_type = ICMPV6_ECHO_REPLY; |
| 562 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 563 | memset(&fl6, 0, sizeof(fl6)); |
| 564 | fl6.flowi6_proto = IPPROTO_ICMPV6; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 565 | fl6.daddr = ipv6_hdr(skb)->saddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | if (saddr) |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 567 | fl6.saddr = *saddr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 568 | fl6.flowi6_oif = skb->dev->ifindex; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 569 | fl6.fl6_icmp_type = ICMPV6_ECHO_REPLY; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 570 | security_skb_classify_flow(skb, flowi6_to_flowi(&fl6)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 572 | sk = icmpv6_xmit_lock(net); |
| 573 | if (sk == NULL) |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 574 | return; |
Denis V. Lunev | fdc0bde | 2008-08-23 04:43:33 -0700 | [diff] [blame] | 575 | np = inet6_sk(sk); |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 576 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 577 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
| 578 | fl6.flowi6_oif = np->mcast_oif; |
Erich E. Hoover | c4062df | 2012-02-08 09:11:08 +0000 | [diff] [blame] | 579 | else if (!fl6.flowi6_oif) |
| 580 | fl6.flowi6_oif = np->ucast_oif; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 582 | err = ip6_dst_lookup(sk, &dst, &fl6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | if (err) |
| 584 | goto out; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 585 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0); |
David S. Miller | 452edd5 | 2011-03-02 13:27:41 -0800 | [diff] [blame] | 586 | if (IS_ERR(dst)) |
Patrick McHardy | e104411b | 2005-09-08 15:11:55 -0700 | [diff] [blame] | 587 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 589 | if (ipv6_addr_is_multicast(&fl6.daddr)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | hlimit = np->mcast_hops; |
| 591 | else |
| 592 | hlimit = np->hop_limit; |
| 593 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 594 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 596 | idev = __in6_dev_get(skb->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
| 598 | msg.skb = skb; |
| 599 | msg.offset = 0; |
Yasuyuki Kozakai | 763ecff | 2006-02-15 15:24:15 -0800 | [diff] [blame] | 600 | msg.type = ICMPV6_ECHO_REPLY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | |
| 602 | err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 603 | sizeof(struct icmp6hdr), hlimit, np->tclass, NULL, &fl6, |
Eldad Zack | a2d91a0 | 2012-04-01 07:49:07 +0000 | [diff] [blame] | 604 | (struct rt6_info *)dst, MSG_DONTWAIT, |
Brian Haley | 13b52cd | 2010-04-23 11:26:08 +0000 | [diff] [blame] | 605 | np->dontfrag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | |
| 607 | if (err) { |
Eric Dumazet | 00d9d6a | 2010-06-07 22:24:44 +0000 | [diff] [blame] | 608 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | ip6_flush_pending_frames(sk); |
Eric Dumazet | cfdf764 | 2011-07-27 21:13:03 +0000 | [diff] [blame] | 610 | } else { |
| 611 | err = icmpv6_push_pending_frames(sk, &fl6, &tmp_hdr, |
| 612 | skb->len + sizeof(struct icmp6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | dst_release(dst); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 615 | out: |
Denis V. Lunev | 405666d | 2008-02-29 11:16:46 -0800 | [diff] [blame] | 616 | icmpv6_xmit_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | } |
| 618 | |
David S. Miller | b94f1c0 | 2012-07-12 00:33:37 -0700 | [diff] [blame] | 619 | void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | { |
Alexey Dobriyan | 41135cc | 2009-09-14 12:22:28 +0000 | [diff] [blame] | 621 | const struct inet6_protocol *ipprot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | int inner_offset; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 623 | __be16 frag_off; |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 624 | u8 nexthdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
| 626 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 627 | return; |
| 628 | |
| 629 | nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; |
| 630 | if (ipv6_ext_hdr(nexthdr)) { |
| 631 | /* now skip over extension headers */ |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 632 | inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), |
| 633 | &nexthdr, &frag_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | if (inner_offset<0) |
| 635 | return; |
| 636 | } else { |
| 637 | inner_offset = sizeof(struct ipv6hdr); |
| 638 | } |
| 639 | |
| 640 | /* Checkin header including 8 bytes of inner protocol header. */ |
| 641 | if (!pskb_may_pull(skb, inner_offset+8)) |
| 642 | return; |
| 643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. |
| 645 | Without this we will not able f.e. to make source routed |
| 646 | pmtu discovery. |
| 647 | Corresponding argument (opt) to notifiers is already added. |
| 648 | --ANK (980726) |
| 649 | */ |
| 650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | rcu_read_lock(); |
David S. Miller | f9242b6 | 2012-06-19 18:56:21 -0700 | [diff] [blame] | 652 | ipprot = rcu_dereference(inet6_protos[nexthdr]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | if (ipprot && ipprot->err_handler) |
| 654 | ipprot->err_handler(skb, NULL, type, code, inner_offset, info); |
| 655 | rcu_read_unlock(); |
| 656 | |
Pavel Emelyanov | 69d6da0 | 2007-11-19 22:35:57 -0800 | [diff] [blame] | 657 | raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | /* |
| 661 | * Handle icmp messages |
| 662 | */ |
| 663 | |
Herbert Xu | e5bbef2 | 2007-10-15 12:50:28 -0700 | [diff] [blame] | 664 | static int icmpv6_rcv(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | struct net_device *dev = skb->dev; |
| 667 | struct inet6_dev *idev = __in6_dev_get(dev); |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 668 | const struct in6_addr *saddr, *daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | struct icmp6hdr *hdr; |
Brian Haley | d5fdd6b | 2009-06-23 04:31:07 -0700 | [diff] [blame] | 670 | u8 type; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Herbert Xu | aebcf82 | 2007-12-12 18:54:16 -0800 | [diff] [blame] | 672 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 673 | struct sec_path *sp = skb_sec_path(skb); |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 674 | int nh; |
| 675 | |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 676 | if (!(sp && sp->xvec[sp->len - 1]->props.flags & |
Herbert Xu | aebcf82 | 2007-12-12 18:54:16 -0800 | [diff] [blame] | 677 | XFRM_STATE_ICMP)) |
| 678 | goto drop_no_count; |
| 679 | |
David S. Miller | 81aded2 | 2012-06-15 14:54:11 -0700 | [diff] [blame] | 680 | if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 681 | goto drop_no_count; |
| 682 | |
| 683 | nh = skb_network_offset(skb); |
| 684 | skb_set_network_header(skb, sizeof(*hdr)); |
| 685 | |
| 686 | if (!xfrm6_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) |
| 687 | goto drop_no_count; |
| 688 | |
| 689 | skb_set_network_header(skb, nh); |
| 690 | } |
| 691 | |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 692 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INMSGS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 694 | saddr = &ipv6_hdr(skb)->saddr; |
| 695 | daddr = &ipv6_hdr(skb)->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
| 697 | /* Perform checksum. */ |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 698 | switch (skb->ip_summed) { |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 699 | case CHECKSUM_COMPLETE: |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 700 | if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, |
| 701 | skb->csum)) |
| 702 | break; |
| 703 | /* fall through */ |
| 704 | case CHECKSUM_NONE: |
Al Viro | 868c86b | 2006-11-14 21:35:48 -0800 | [diff] [blame] | 705 | skb->csum = ~csum_unfold(csum_ipv6_magic(saddr, daddr, skb->len, |
| 706 | IPPROTO_ICMPV6, 0)); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 707 | if (__skb_checksum_complete(skb)) { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 708 | LIMIT_NETDEBUG(KERN_DEBUG |
| 709 | "ICMPv6 checksum failed [%pI6c > %pI6c]\n", |
Harvey Harrison | 0c6ce78 | 2008-10-28 16:09:23 -0700 | [diff] [blame] | 710 | saddr, daddr); |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 711 | goto csum_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | } |
| 713 | } |
| 714 | |
Herbert Xu | 8cf2294 | 2008-02-05 03:15:50 -0800 | [diff] [blame] | 715 | if (!pskb_pull(skb, sizeof(*hdr))) |
| 716 | goto discard_it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 718 | hdr = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | type = hdr->icmp6_type; |
| 721 | |
Denis V. Lunev | 55d4380 | 2008-10-08 10:34:54 -0700 | [diff] [blame] | 722 | ICMP6MSGIN_INC_STATS_BH(dev_net(dev), idev, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | switch (type) { |
| 725 | case ICMPV6_ECHO_REQUEST: |
| 726 | icmpv6_echo_reply(skb); |
| 727 | break; |
| 728 | |
| 729 | case ICMPV6_ECHO_REPLY: |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 730 | ping_rcv(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | break; |
| 732 | |
| 733 | case ICMPV6_PKT_TOOBIG: |
| 734 | /* BUGGG_FUTURE: if packet contains rthdr, we cannot update |
| 735 | standard destination cache. Seems, only "advanced" |
| 736 | destination cache will allow to solve this problem |
| 737 | --ANK (980726) |
| 738 | */ |
| 739 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
| 740 | goto discard_it; |
Arnaldo Carvalho de Melo | cc70ab2 | 2007-03-13 14:03:22 -0300 | [diff] [blame] | 741 | hdr = icmp6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | |
| 743 | /* |
| 744 | * Drop through to notify |
| 745 | */ |
| 746 | |
| 747 | case ICMPV6_DEST_UNREACH: |
| 748 | case ICMPV6_TIME_EXCEED: |
| 749 | case ICMPV6_PARAMPROB: |
| 750 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
| 751 | break; |
| 752 | |
| 753 | case NDISC_ROUTER_SOLICITATION: |
| 754 | case NDISC_ROUTER_ADVERTISEMENT: |
| 755 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 756 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 757 | case NDISC_REDIRECT: |
| 758 | ndisc_rcv(skb); |
| 759 | break; |
| 760 | |
| 761 | case ICMPV6_MGM_QUERY: |
| 762 | igmp6_event_query(skb); |
| 763 | break; |
| 764 | |
| 765 | case ICMPV6_MGM_REPORT: |
| 766 | igmp6_event_report(skb); |
| 767 | break; |
| 768 | |
| 769 | case ICMPV6_MGM_REDUCTION: |
| 770 | case ICMPV6_NI_QUERY: |
| 771 | case ICMPV6_NI_REPLY: |
| 772 | case ICMPV6_MLD2_REPORT: |
| 773 | case ICMPV6_DHAAD_REQUEST: |
| 774 | case ICMPV6_DHAAD_REPLY: |
| 775 | case ICMPV6_MOBILE_PREFIX_SOL: |
| 776 | case ICMPV6_MOBILE_PREFIX_ADV: |
| 777 | break; |
| 778 | |
| 779 | default: |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 780 | LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
| 782 | /* informational */ |
| 783 | if (type & ICMPV6_INFOMSG_MASK) |
| 784 | break; |
| 785 | |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 786 | /* |
| 787 | * error of unknown type. |
| 788 | * must pass to upper level |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | */ |
| 790 | |
| 791 | icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 792 | } |
| 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | kfree_skb(skb); |
| 795 | return 0; |
| 796 | |
Eric Dumazet | 6a5dc9e | 2013-04-29 08:39:56 +0000 | [diff] [blame] | 797 | csum_error: |
| 798 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_CSUMERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | discard_it: |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 800 | ICMP6_INC_STATS_BH(dev_net(dev), idev, ICMP6_MIB_INERRORS); |
Herbert Xu | 8b7817f | 2007-12-12 10:44:43 -0800 | [diff] [blame] | 801 | drop_no_count: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | kfree_skb(skb); |
| 803 | return 0; |
| 804 | } |
| 805 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 806 | void icmpv6_flow_init(struct sock *sk, struct flowi6 *fl6, |
YOSHIFUJI Hideaki | 95e41e9 | 2007-12-06 15:43:30 -0800 | [diff] [blame] | 807 | u8 type, |
| 808 | const struct in6_addr *saddr, |
| 809 | const struct in6_addr *daddr, |
| 810 | int oif) |
| 811 | { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 812 | memset(fl6, 0, sizeof(*fl6)); |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 813 | fl6->saddr = *saddr; |
| 814 | fl6->daddr = *daddr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 815 | fl6->flowi6_proto = IPPROTO_ICMPV6; |
David S. Miller | 1958b85 | 2011-03-12 16:36:19 -0500 | [diff] [blame] | 816 | fl6->fl6_icmp_type = type; |
| 817 | fl6->fl6_icmp_code = 0; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 818 | fl6->flowi6_oif = oif; |
| 819 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); |
YOSHIFUJI Hideaki | 95e41e9 | 2007-12-06 15:43:30 -0800 | [diff] [blame] | 820 | } |
| 821 | |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 822 | /* |
Denis V. Lunev | b7e729c | 2008-02-29 11:16:08 -0800 | [diff] [blame] | 823 | * Special lock-class for __icmpv6_sk: |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 824 | */ |
| 825 | static struct lock_class_key icmpv6_socket_sk_dst_lock_key; |
| 826 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 827 | static int __net_init icmpv6_sk_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | { |
| 829 | struct sock *sk; |
| 830 | int err, i, j; |
| 831 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 832 | net->ipv6.icmp_sk = |
| 833 | kzalloc(nr_cpu_ids * sizeof(struct sock *), GFP_KERNEL); |
| 834 | if (net->ipv6.icmp_sk == NULL) |
Denis V. Lunev | 79c9115 | 2008-02-29 11:17:11 -0800 | [diff] [blame] | 835 | return -ENOMEM; |
| 836 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 837 | for_each_possible_cpu(i) { |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 838 | err = inet_ctl_sock_create(&sk, PF_INET6, |
| 839 | SOCK_RAW, IPPROTO_ICMPV6, net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | if (err < 0) { |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 841 | pr_err("Failed to initialize the ICMP6 control socket (err %d)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | err); |
| 843 | goto fail; |
| 844 | } |
| 845 | |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 846 | net->ipv6.icmp_sk[i] = sk; |
Denis V. Lunev | 5c8cafd | 2008-02-29 11:19:22 -0800 | [diff] [blame] | 847 | |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 848 | /* |
| 849 | * Split off their lock-class, because sk->sk_dst_lock |
| 850 | * gets used from softirqs, which is safe for |
Denis V. Lunev | b7e729c | 2008-02-29 11:16:08 -0800 | [diff] [blame] | 851 | * __icmpv6_sk (because those never get directly used |
Ingo Molnar | 640c41c | 2006-08-15 00:06:56 -0700 | [diff] [blame] | 852 | * via userspace syscalls), but unsafe for normal sockets. |
| 853 | */ |
| 854 | lockdep_set_class(&sk->sk_dst_lock, |
| 855 | &icmpv6_socket_sk_dst_lock_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | |
| 857 | /* Enough space for 2 64K ICMP packets, including |
| 858 | * sk_buff struct overhead. |
| 859 | */ |
Eric Dumazet | 87fb4b7 | 2011-10-13 07:28:54 +0000 | [diff] [blame] | 860 | sk->sk_sndbuf = 2 * SKB_TRUESIZE(64 * 1024); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | return 0; |
| 863 | |
| 864 | fail: |
Denis V. Lunev | 5c8cafd | 2008-02-29 11:19:22 -0800 | [diff] [blame] | 865 | for (j = 0; j < i; j++) |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 866 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[j]); |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 867 | kfree(net->ipv6.icmp_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | return err; |
| 869 | } |
| 870 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 871 | static void __net_exit icmpv6_sk_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | { |
| 873 | int i; |
| 874 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 875 | for_each_possible_cpu(i) { |
Denis V. Lunev | 1ed8516 | 2008-04-03 14:31:03 -0700 | [diff] [blame] | 876 | inet_ctl_sock_destroy(net->ipv6.icmp_sk[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 878 | kfree(net->ipv6.icmp_sk); |
| 879 | } |
| 880 | |
Alexey Dobriyan | 8ed7edc | 2008-03-03 12:02:54 -0800 | [diff] [blame] | 881 | static struct pernet_operations icmpv6_sk_ops = { |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 882 | .init = icmpv6_sk_init, |
| 883 | .exit = icmpv6_sk_exit, |
| 884 | }; |
| 885 | |
| 886 | int __init icmpv6_init(void) |
| 887 | { |
| 888 | int err; |
| 889 | |
| 890 | err = register_pernet_subsys(&icmpv6_sk_ops); |
| 891 | if (err < 0) |
| 892 | return err; |
| 893 | |
| 894 | err = -EAGAIN; |
| 895 | if (inet6_add_protocol(&icmpv6_protocol, IPPROTO_ICMPV6) < 0) |
| 896 | goto fail; |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 897 | |
| 898 | err = inet6_register_icmp_sender(icmp6_send); |
| 899 | if (err) |
| 900 | goto sender_reg_err; |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 901 | return 0; |
| 902 | |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 903 | sender_reg_err: |
| 904 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 905 | fail: |
Joe Perches | f321383 | 2012-05-15 14:11:53 +0000 | [diff] [blame] | 906 | pr_err("Failed to register ICMP6 protocol\n"); |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 907 | unregister_pernet_subsys(&icmpv6_sk_ops); |
| 908 | return err; |
| 909 | } |
| 910 | |
Alexey Dobriyan | 8ed7edc | 2008-03-03 12:02:54 -0800 | [diff] [blame] | 911 | void icmpv6_cleanup(void) |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 912 | { |
Pravin B Shelar | 5f5624c | 2013-04-25 11:08:30 +0000 | [diff] [blame] | 913 | inet6_unregister_icmp_sender(icmp6_send); |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 914 | unregister_pernet_subsys(&icmpv6_sk_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); |
| 916 | } |
| 917 | |
Denis V. Lunev | 98c6d1b | 2008-02-29 11:21:22 -0800 | [diff] [blame] | 918 | |
Arjan van de Ven | 9b5b5cf | 2005-11-29 16:21:38 -0800 | [diff] [blame] | 919 | static const struct icmp6_err { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | int err; |
| 921 | int fatal; |
| 922 | } tab_unreach[] = { |
| 923 | { /* NOROUTE */ |
| 924 | .err = ENETUNREACH, |
| 925 | .fatal = 0, |
| 926 | }, |
| 927 | { /* ADM_PROHIBITED */ |
| 928 | .err = EACCES, |
| 929 | .fatal = 1, |
| 930 | }, |
| 931 | { /* Was NOT_NEIGHBOUR, now reserved */ |
| 932 | .err = EHOSTUNREACH, |
| 933 | .fatal = 0, |
| 934 | }, |
| 935 | { /* ADDR_UNREACH */ |
| 936 | .err = EHOSTUNREACH, |
| 937 | .fatal = 0, |
| 938 | }, |
| 939 | { /* PORT_UNREACH */ |
| 940 | .err = ECONNREFUSED, |
| 941 | .fatal = 1, |
| 942 | }, |
| 943 | }; |
| 944 | |
Brian Haley | d5fdd6b | 2009-06-23 04:31:07 -0700 | [diff] [blame] | 945 | int icmpv6_err_convert(u8 type, u8 code, int *err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | { |
| 947 | int fatal = 0; |
| 948 | |
| 949 | *err = EPROTO; |
| 950 | |
| 951 | switch (type) { |
| 952 | case ICMPV6_DEST_UNREACH: |
| 953 | fatal = 1; |
| 954 | if (code <= ICMPV6_PORT_UNREACH) { |
| 955 | *err = tab_unreach[code].err; |
| 956 | fatal = tab_unreach[code].fatal; |
| 957 | } |
| 958 | break; |
| 959 | |
| 960 | case ICMPV6_PKT_TOOBIG: |
| 961 | *err = EMSGSIZE; |
| 962 | break; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 963 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | case ICMPV6_PARAMPROB: |
| 965 | *err = EPROTO; |
| 966 | fatal = 1; |
| 967 | break; |
| 968 | |
| 969 | case ICMPV6_TIME_EXCEED: |
| 970 | *err = EHOSTUNREACH; |
| 971 | break; |
Stephen Hemminger | 3ff50b7 | 2007-04-20 17:09:22 -0700 | [diff] [blame] | 972 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | return fatal; |
| 975 | } |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 976 | EXPORT_SYMBOL(icmpv6_err_convert); |
| 977 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | #ifdef CONFIG_SYSCTL |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame^] | 979 | struct ctl_table ipv6_icmp_table_template[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | .procname = "ratelimit", |
Daniel Lezcano | 41a7690 | 2008-01-10 03:02:40 -0800 | [diff] [blame] | 982 | .data = &init_net.ipv6.sysctl.icmpv6_time, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | .maxlen = sizeof(int), |
| 984 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 985 | .proc_handler = proc_dointvec_ms_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | }, |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 987 | { }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | }; |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 989 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 990 | struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net) |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 991 | { |
| 992 | struct ctl_table *table; |
| 993 | |
| 994 | table = kmemdup(ipv6_icmp_table_template, |
| 995 | sizeof(ipv6_icmp_table_template), |
| 996 | GFP_KERNEL); |
YOSHIFUJI Hideaki | 5ee0910 | 2008-02-28 00:24:28 +0900 | [diff] [blame] | 997 | |
Eric W. Biederman | c027aab | 2012-11-16 03:03:10 +0000 | [diff] [blame] | 998 | if (table) |
YOSHIFUJI Hideaki | 5ee0910 | 2008-02-28 00:24:28 +0900 | [diff] [blame] | 999 | table[0].data = &net->ipv6.sysctl.icmpv6_time; |
| 1000 | |
Daniel Lezcano | 760f2d0 | 2008-01-10 02:53:43 -0800 | [diff] [blame] | 1001 | return table; |
| 1002 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | #endif |
| 1004 | |