Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * IPv6 output functions |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Based on linux/net/ipv4/ip_output.c |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | * |
| 15 | * Changes: |
| 16 | * A.N.Kuznetsov : airthmetics in fragmentation. |
| 17 | * extension headers are implemented. |
| 18 | * route changes now work. |
| 19 | * ip6_forward does not confuse sniffers. |
| 20 | * etc. |
| 21 | * |
| 22 | * H. von Brand : Added missing #include <linux/string.h> |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 23 | * Imran Patel : frag id should be in NBO |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | * Kazunori MIYAZAWA @USAGI |
| 25 | * : add ip6_append_data and related functions |
| 26 | * for datagram xmit |
| 27 | */ |
| 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/errno.h> |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 30 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/string.h> |
| 32 | #include <linux/socket.h> |
| 33 | #include <linux/net.h> |
| 34 | #include <linux/netdevice.h> |
| 35 | #include <linux/if_arp.h> |
| 36 | #include <linux/in6.h> |
| 37 | #include <linux/tcp.h> |
| 38 | #include <linux/route.h> |
Herbert Xu | b59f45d | 2006-05-27 23:05:54 -0700 | [diff] [blame] | 39 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
| 42 | #include <linux/netfilter.h> |
| 43 | #include <linux/netfilter_ipv6.h> |
| 44 | |
| 45 | #include <net/sock.h> |
| 46 | #include <net/snmp.h> |
| 47 | |
| 48 | #include <net/ipv6.h> |
| 49 | #include <net/ndisc.h> |
| 50 | #include <net/protocol.h> |
| 51 | #include <net/ip6_route.h> |
| 52 | #include <net/addrconf.h> |
| 53 | #include <net/rawv6.h> |
| 54 | #include <net/icmp.h> |
| 55 | #include <net/xfrm.h> |
| 56 | #include <net/checksum.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 57 | #include <linux/mroute6.h> |
David Ahern | ca25449 | 2015-10-12 11:47:10 -0700 | [diff] [blame] | 58 | #include <net/l3mdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Eric W. Biederman | 7d8c6e3 | 2015-06-12 22:12:04 -0500 | [diff] [blame] | 60 | static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 62 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | struct net_device *dev = dst->dev; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 64 | struct neighbour *neigh; |
YOSHIFUJI Hideaki / 吉藤英明 | 6fd6ce2 | 2013-01-17 12:54:00 +0000 | [diff] [blame] | 65 | struct in6_addr *nexthop; |
| 66 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | skb->protocol = htons(ETH_P_IPV6); |
| 69 | skb->dev = dev; |
| 70 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 71 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 72 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
David Miller | 7026b1d | 2015-04-05 22:19:04 -0400 | [diff] [blame] | 74 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) && |
Eric W. Biederman | 78126c4 | 2015-09-15 20:04:09 -0500 | [diff] [blame] | 75 | ((mroute6_socket(net, skb) && |
Benjamin Thery | bd91b8b | 2008-12-10 16:07:08 -0800 | [diff] [blame] | 76 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 77 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
| 78 | &ipv6_hdr(skb)->saddr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
| 80 | |
| 81 | /* Do not check for IFF_ALLMULTI; multicast routing |
| 82 | is not supported in any case. |
| 83 | */ |
| 84 | if (newskb) |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 85 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
Eric W. Biederman | 29a26a5 | 2015-09-15 20:04:16 -0500 | [diff] [blame] | 86 | net, sk, newskb, NULL, newskb->dev, |
Michel Machado | 95603e2 | 2012-06-12 10:16:35 +0000 | [diff] [blame] | 87 | dev_loopback_xmit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 89 | if (ipv6_hdr(skb)->hop_limit == 0) { |
Eric W. Biederman | 78126c4 | 2015-09-15 20:04:09 -0500 | [diff] [blame] | 90 | IP6_INC_STATS(net, idev, |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 91 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | kfree_skb(skb); |
| 93 | return 0; |
| 94 | } |
| 95 | } |
| 96 | |
Eric W. Biederman | 78126c4 | 2015-09-15 20:04:09 -0500 | [diff] [blame] | 97 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, skb->len); |
Hannes Frederic Sowa | dd40851 | 2013-02-10 02:33:35 +0000 | [diff] [blame] | 98 | |
| 99 | if (IPV6_ADDR_MC_SCOPE(&ipv6_hdr(skb)->daddr) <= |
| 100 | IPV6_ADDR_SCOPE_NODELOCAL && |
| 101 | !(dev->flags & IFF_LOOPBACK)) { |
| 102 | kfree_skb(skb); |
| 103 | return 0; |
| 104 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
YOSHIFUJI Hideaki / 吉藤英明 | 6fd6ce2 | 2013-01-17 12:54:00 +0000 | [diff] [blame] | 107 | rcu_read_lock_bh(); |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 108 | nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr); |
YOSHIFUJI Hideaki / 吉藤英明 | 6fd6ce2 | 2013-01-17 12:54:00 +0000 | [diff] [blame] | 109 | neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop); |
| 110 | if (unlikely(!neigh)) |
| 111 | neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false); |
| 112 | if (!IS_ERR(neigh)) { |
| 113 | ret = dst_neigh_output(dst, neigh, skb); |
| 114 | rcu_read_unlock_bh(); |
| 115 | return ret; |
| 116 | } |
| 117 | rcu_read_unlock_bh(); |
David S. Miller | 05e3aa0 | 2011-07-16 17:26:00 -0700 | [diff] [blame] | 118 | |
Eric W. Biederman | 78126c4 | 2015-09-15 20:04:09 -0500 | [diff] [blame] | 119 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 120 | kfree_skb(skb); |
| 121 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
Eric W. Biederman | 0c4b51f | 2015-09-15 20:04:18 -0500 | [diff] [blame] | 124 | static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 125 | { |
| 126 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || |
Jiri Pirko | 9037c35 | 2013-11-06 17:52:19 +0100 | [diff] [blame] | 127 | dst_allfrag(skb_dst(skb)) || |
| 128 | (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size)) |
Eric W. Biederman | 7d8c6e3 | 2015-06-12 22:12:04 -0500 | [diff] [blame] | 129 | return ip6_fragment(net, sk, skb, ip6_finish_output2); |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 130 | else |
Eric W. Biederman | 7d8c6e3 | 2015-06-12 22:12:04 -0500 | [diff] [blame] | 131 | return ip6_finish_output2(net, sk, skb); |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 132 | } |
| 133 | |
Eric W. Biederman | ede2059 | 2015-10-07 16:48:47 -0500 | [diff] [blame] | 134 | int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 136 | struct net_device *dev = skb_dst(skb)->dev; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 137 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
Eric W. Biederman | be10de0 | 2015-09-17 17:21:31 -0500 | [diff] [blame] | 138 | |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 139 | if (unlikely(idev->cnf.disable_ipv6)) { |
Eric W. Biederman | 19a0644 | 2015-09-15 20:04:10 -0500 | [diff] [blame] | 140 | IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 141 | kfree_skb(skb); |
| 142 | return 0; |
| 143 | } |
| 144 | |
Eric W. Biederman | 29a26a5 | 2015-09-15 20:04:16 -0500 | [diff] [blame] | 145 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
| 146 | net, sk, skb, NULL, dev, |
Jan Engelhardt | 9c6eb28 | 2010-04-13 15:32:16 +0200 | [diff] [blame] | 147 | ip6_finish_output, |
| 148 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | } |
| 150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | /* |
Eric Dumazet | 1c1e9d2 | 2015-09-25 07:39:20 -0700 | [diff] [blame] | 152 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
| 153 | * Note : socket lock is not held for SYNACK packets, but might be modified |
| 154 | * by calls to skb_set_owner_w() and ipv6_local_error(), |
| 155 | * which are using proper atomic operations or spinlocks. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | */ |
Eric Dumazet | 1c1e9d2 | 2015-09-25 07:39:20 -0700 | [diff] [blame] | 157 | int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 158 | struct ipv6_txoptions *opt, int tclass) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 160 | struct net *net = sock_net(sk); |
Eric Dumazet | 1c1e9d2 | 2015-09-25 07:39:20 -0700 | [diff] [blame] | 161 | const struct ipv6_pinfo *np = inet6_sk(sk); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 162 | struct in6_addr *first_hop = &fl6->daddr; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 163 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | struct ipv6hdr *hdr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 165 | u8 proto = fl6->flowi6_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | int seg_len = skb->len; |
Gerrit Renker | e651f03 | 2009-08-09 08:12:48 +0000 | [diff] [blame] | 167 | int hlimit = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | u32 mtu; |
| 169 | |
| 170 | if (opt) { |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 171 | unsigned int head_room; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | /* First: exthdrs may take lots of space (~8K for now) |
| 174 | MAX_HEADER is not enough. |
| 175 | */ |
| 176 | head_room = opt->opt_nflen + opt->opt_flen; |
| 177 | seg_len += head_room; |
| 178 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); |
| 179 | |
| 180 | if (skb_headroom(skb) < head_room) { |
| 181 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 182 | if (!skb2) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 183 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 184 | IPSTATS_MIB_OUTDISCARDS); |
| 185 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | return -ENOBUFS; |
| 187 | } |
Eric Dumazet | 808db80 | 2012-04-24 10:17:59 +0000 | [diff] [blame] | 188 | consume_skb(skb); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 189 | skb = skb2; |
Eric Dumazet | 1c1e9d2 | 2015-09-25 07:39:20 -0700 | [diff] [blame] | 190 | /* skb_set_owner_w() changes sk->sk_wmem_alloc atomically, |
| 191 | * it is safe to call in our context (socket lock not held) |
| 192 | */ |
| 193 | skb_set_owner_w(skb, (struct sock *)sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | if (opt->opt_flen) |
| 196 | ipv6_push_frag_opts(skb, opt, &proto); |
| 197 | if (opt->opt_nflen) |
| 198 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); |
| 199 | } |
| 200 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 201 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 202 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 203 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | /* |
| 206 | * Fill in the IPv6 header |
| 207 | */ |
Eric Dumazet | b903d32 | 2011-10-27 00:44:35 -0400 | [diff] [blame] | 208 | if (np) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | hlimit = np->hop_limit; |
| 210 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 211 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Tom Herbert | cb1ce2e | 2014-07-01 21:33:10 -0700 | [diff] [blame] | 213 | ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel, |
Tom Herbert | 67800f9 | 2015-07-31 16:52:11 -0700 | [diff] [blame] | 214 | np->autoflowlabel, fl6)); |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | hdr->payload_len = htons(seg_len); |
| 217 | hdr->nexthdr = proto; |
| 218 | hdr->hop_limit = hlimit; |
| 219 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 220 | hdr->saddr = fl6->saddr; |
| 221 | hdr->daddr = *first_hop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
Hannes Frederic Sowa | 9c9c9ad | 2013-08-26 12:31:23 +0200 | [diff] [blame] | 223 | skb->protocol = htons(ETH_P_IPV6); |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 224 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 225 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | mtu = dst_mtu(dst); |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 228 | if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 229 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 230 | IPSTATS_MIB_OUT, skb->len); |
Eric Dumazet | 1c1e9d2 | 2015-09-25 07:39:20 -0700 | [diff] [blame] | 231 | /* hooks should never assume socket lock is held. |
| 232 | * we promote our socket to non const |
| 233 | */ |
Eric W. Biederman | 29a26a5 | 2015-09-15 20:04:16 -0500 | [diff] [blame] | 234 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
Eric Dumazet | 1c1e9d2 | 2015-09-25 07:39:20 -0700 | [diff] [blame] | 235 | net, (struct sock *)sk, skb, NULL, dst->dev, |
Eric W. Biederman | 13206b6 | 2015-10-07 16:48:35 -0500 | [diff] [blame] | 236 | dst_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | skb->dev = dst->dev; |
Eric Dumazet | 1c1e9d2 | 2015-09-25 07:39:20 -0700 | [diff] [blame] | 240 | /* ipv6_local_error() does not require socket lock, |
| 241 | * we promote our socket to non const |
| 242 | */ |
| 243 | ipv6_local_error((struct sock *)sk, EMSGSIZE, fl6, mtu); |
| 244 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 245 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | kfree_skb(skb); |
| 247 | return -EMSGSIZE; |
| 248 | } |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 249 | EXPORT_SYMBOL(ip6_xmit); |
| 250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
| 252 | { |
| 253 | struct ip6_ra_chain *ra; |
| 254 | struct sock *last = NULL; |
| 255 | |
| 256 | read_lock(&ip6_ra_lock); |
| 257 | for (ra = ip6_ra_chain; ra; ra = ra->next) { |
| 258 | struct sock *sk = ra->sk; |
Andrew McDonald | 0bd1b59 | 2005-08-09 19:44:42 -0700 | [diff] [blame] | 259 | if (sk && ra->sel == sel && |
| 260 | (!sk->sk_bound_dev_if || |
| 261 | sk->sk_bound_dev_if == skb->dev->ifindex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | if (last) { |
| 263 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 264 | if (skb2) |
| 265 | rawv6_rcv(last, skb2); |
| 266 | } |
| 267 | last = sk; |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | if (last) { |
| 272 | rawv6_rcv(last, skb); |
| 273 | read_unlock(&ip6_ra_lock); |
| 274 | return 1; |
| 275 | } |
| 276 | read_unlock(&ip6_ra_lock); |
| 277 | return 0; |
| 278 | } |
| 279 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 280 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
| 281 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 282 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 283 | u8 nexthdr = hdr->nexthdr; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 284 | __be16 frag_off; |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 285 | int offset; |
| 286 | |
| 287 | if (ipv6_ext_hdr(nexthdr)) { |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 288 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr, &frag_off); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 289 | if (offset < 0) |
| 290 | return 0; |
| 291 | } else |
| 292 | offset = sizeof(struct ipv6hdr); |
| 293 | |
| 294 | if (nexthdr == IPPROTO_ICMPV6) { |
| 295 | struct icmp6hdr *icmp6; |
| 296 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 297 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
| 298 | offset + 1 - skb->data))) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 299 | return 0; |
| 300 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 301 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 302 | |
| 303 | switch (icmp6->icmp6_type) { |
| 304 | case NDISC_ROUTER_SOLICITATION: |
| 305 | case NDISC_ROUTER_ADVERTISEMENT: |
| 306 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 307 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 308 | case NDISC_REDIRECT: |
| 309 | /* For reaction involving unicast neighbor discovery |
| 310 | * message destined to the proxied address, pass it to |
| 311 | * input function. |
| 312 | */ |
| 313 | return 1; |
| 314 | default: |
| 315 | break; |
| 316 | } |
| 317 | } |
| 318 | |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 319 | /* |
| 320 | * The proxying router can't forward traffic sent to a link-local |
| 321 | * address, so signal the sender and discard the packet. This |
| 322 | * behavior is clarified by the MIPv6 specification. |
| 323 | */ |
| 324 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { |
| 325 | dst_link_failure(skb); |
| 326 | return -1; |
| 327 | } |
| 328 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 329 | return 0; |
| 330 | } |
| 331 | |
Eric W. Biederman | 0c4b51f | 2015-09-15 20:04:18 -0500 | [diff] [blame] | 332 | static inline int ip6_forward_finish(struct net *net, struct sock *sk, |
| 333 | struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | { |
Eric Dumazet | c29390c | 2015-03-11 18:42:02 -0700 | [diff] [blame] | 335 | skb_sender_cpu_clear(skb); |
Eric W. Biederman | 13206b6 | 2015-10-07 16:48:35 -0500 | [diff] [blame] | 336 | return dst_output(net, sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Hannes Frederic Sowa | 0954cf9 | 2014-01-09 10:01:16 +0100 | [diff] [blame] | 339 | static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst) |
| 340 | { |
| 341 | unsigned int mtu; |
| 342 | struct inet6_dev *idev; |
| 343 | |
| 344 | if (dst_metric_locked(dst, RTAX_MTU)) { |
| 345 | mtu = dst_metric_raw(dst, RTAX_MTU); |
| 346 | if (mtu) |
| 347 | return mtu; |
| 348 | } |
| 349 | |
| 350 | mtu = IPV6_MIN_MTU; |
| 351 | rcu_read_lock(); |
| 352 | idev = __in6_dev_get(dst->dev); |
| 353 | if (idev) |
| 354 | mtu = idev->cnf.mtu6; |
| 355 | rcu_read_unlock(); |
| 356 | |
| 357 | return mtu; |
| 358 | } |
| 359 | |
Florian Westphal | fe6cc55 | 2014-02-13 23:09:12 +0100 | [diff] [blame] | 360 | static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) |
| 361 | { |
Florian Westphal | 418a315 | 2014-05-05 00:03:34 +0200 | [diff] [blame] | 362 | if (skb->len <= mtu) |
Florian Westphal | fe6cc55 | 2014-02-13 23:09:12 +0100 | [diff] [blame] | 363 | return false; |
| 364 | |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 365 | /* ipv6 conntrack defrag sets max_frag_size + ignore_df */ |
Florian Westphal | fe6cc55 | 2014-02-13 23:09:12 +0100 | [diff] [blame] | 366 | if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu) |
| 367 | return true; |
| 368 | |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 369 | if (skb->ignore_df) |
Florian Westphal | 418a315 | 2014-05-05 00:03:34 +0200 | [diff] [blame] | 370 | return false; |
| 371 | |
Florian Westphal | fe6cc55 | 2014-02-13 23:09:12 +0100 | [diff] [blame] | 372 | if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu) |
| 373 | return false; |
| 374 | |
| 375 | return true; |
| 376 | } |
| 377 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | int ip6_forward(struct sk_buff *skb) |
| 379 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 380 | struct dst_entry *dst = skb_dst(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 381 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | struct inet6_skb_parm *opt = IP6CB(skb); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 383 | struct net *net = dev_net(dst->dev); |
Ulrich Weber | 14f3ad6 | 2010-02-26 04:34:49 -0800 | [diff] [blame] | 384 | u32 mtu; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 385 | |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 386 | if (net->ipv6.devconf_all->forwarding == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | goto error; |
| 388 | |
Li RongQing | 090f116 | 2014-03-11 10:40:08 +0800 | [diff] [blame] | 389 | if (skb->pkt_type != PACKET_HOST) |
| 390 | goto drop; |
| 391 | |
Hannes Frederic Sowa | 9ef2e96 | 2015-10-08 18:19:53 +0200 | [diff] [blame] | 392 | if (unlikely(skb->sk)) |
| 393 | goto drop; |
| 394 | |
Ben Hutchings | 4497b07 | 2008-06-19 16:22:28 -0700 | [diff] [blame] | 395 | if (skb_warn_if_lro(skb)) |
| 396 | goto drop; |
| 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
Eric Dumazet | 15c77d8 | 2013-12-05 21:38:06 -0800 | [diff] [blame] | 399 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
| 400 | IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | goto drop; |
| 402 | } |
| 403 | |
Herbert Xu | 35fc92a | 2007-03-26 23:22:20 -0700 | [diff] [blame] | 404 | skb_forward_csum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
| 406 | /* |
| 407 | * We DO NOT make any processing on |
| 408 | * RA packets, pushing them to user level AS IS |
| 409 | * without ane WARRANTY that application will be able |
| 410 | * to interpret them. The reason is that we |
| 411 | * cannot make anything clever here. |
| 412 | * |
| 413 | * We are not end-node, so that if packet contains |
| 414 | * AH/ESP, we cannot make anything. |
| 415 | * Defragmentation also would be mistake, RA packets |
| 416 | * cannot be fragmented, because there is no warranty |
| 417 | * that different fragments will go along one path. --ANK |
| 418 | */ |
YOSHIFUJI Hideaki / 吉藤英明 | ab4eb35 | 2013-06-22 11:13:13 +0900 | [diff] [blame] | 419 | if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) { |
| 420 | if (ip6_call_ra_chain(skb, ntohs(opt->ra))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | /* |
| 425 | * check and decrement ttl |
| 426 | */ |
| 427 | if (hdr->hop_limit <= 1) { |
| 428 | /* Force OUTPUT device used as source address */ |
| 429 | skb->dev = dst->dev; |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 430 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
Eric Dumazet | 15c77d8 | 2013-12-05 21:38:06 -0800 | [diff] [blame] | 431 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
| 432 | IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | |
| 434 | kfree_skb(skb); |
| 435 | return -ETIMEDOUT; |
| 436 | } |
| 437 | |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 438 | /* XXX: idev->cnf.proxy_ndp? */ |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 439 | if (net->ipv6.devconf_all->proxy_ndp && |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 440 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 441 | int proxied = ip6_forward_proxy_check(skb); |
| 442 | if (proxied > 0) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 443 | return ip6_input(skb); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 444 | else if (proxied < 0) { |
Eric Dumazet | 15c77d8 | 2013-12-05 21:38:06 -0800 | [diff] [blame] | 445 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
| 446 | IPSTATS_MIB_INDISCARDS); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 447 | goto drop; |
| 448 | } |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 449 | } |
| 450 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | if (!xfrm6_route_forward(skb)) { |
Eric Dumazet | 15c77d8 | 2013-12-05 21:38:06 -0800 | [diff] [blame] | 452 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
| 453 | IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | goto drop; |
| 455 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 456 | dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
| 458 | /* IPv6 specs say nothing about it, but it is clear that we cannot |
| 459 | send redirects to source routed frames. |
Masahide NAKAMURA | 1e5dc14 | 2007-08-24 19:08:55 +0900 | [diff] [blame] | 460 | We don't send redirects to frames decapsulated from IPsec. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | */ |
David S. Miller | c45a3df | 2012-01-27 15:32:19 -0800 | [diff] [blame] | 462 | if (skb->dev == dst->dev && opt->srcrt == 0 && !skb_sec_path(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | struct in6_addr *target = NULL; |
David S. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 464 | struct inet_peer *peer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | struct rt6_info *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | /* |
| 468 | * incoming and outgoing devices are the same |
| 469 | * send a redirect. |
| 470 | */ |
| 471 | |
| 472 | rt = (struct rt6_info *) dst; |
David S. Miller | c45a3df | 2012-01-27 15:32:19 -0800 | [diff] [blame] | 473 | if (rt->rt6i_flags & RTF_GATEWAY) |
| 474 | target = &rt->rt6i_gateway; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | else |
| 476 | target = &hdr->daddr; |
| 477 | |
Martin KaFai Lau | fd0273d | 2015-05-22 20:55:57 -0700 | [diff] [blame] | 478 | peer = inet_getpeer_v6(net->ipv6.peers, &hdr->daddr, 1); |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | /* Limit redirects both by destination (here) |
| 481 | and by source (inside ndisc_send_redirect) |
| 482 | */ |
David S. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 483 | if (inet_peer_xrlim_allow(peer, 1*HZ)) |
David S. Miller | 4991969 | 2012-01-27 15:30:48 -0800 | [diff] [blame] | 484 | ndisc_send_redirect(skb, target); |
David S. Miller | 1d861aa | 2012-07-10 03:58:16 -0700 | [diff] [blame] | 485 | if (peer) |
| 486 | inet_putpeer(peer); |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 487 | } else { |
| 488 | int addrtype = ipv6_addr_type(&hdr->saddr); |
| 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | /* This check is security critical. */ |
YOSHIFUJI Hideaki | f81b2e7 | 2008-06-25 16:55:26 +0900 | [diff] [blame] | 491 | if (addrtype == IPV6_ADDR_ANY || |
| 492 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 493 | goto error; |
| 494 | if (addrtype & IPV6_ADDR_LINKLOCAL) { |
| 495 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 496 | ICMPV6_NOT_NEIGHBOUR, 0); |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 497 | goto error; |
| 498 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
Hannes Frederic Sowa | 0954cf9 | 2014-01-09 10:01:16 +0100 | [diff] [blame] | 501 | mtu = ip6_dst_mtu_forward(dst); |
Ulrich Weber | 14f3ad6 | 2010-02-26 04:34:49 -0800 | [diff] [blame] | 502 | if (mtu < IPV6_MIN_MTU) |
| 503 | mtu = IPV6_MIN_MTU; |
| 504 | |
Florian Westphal | fe6cc55 | 2014-02-13 23:09:12 +0100 | [diff] [blame] | 505 | if (ip6_pkt_too_big(skb, mtu)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | /* Again, force OUTPUT device used as source address */ |
| 507 | skb->dev = dst->dev; |
Ulrich Weber | 14f3ad6 | 2010-02-26 04:34:49 -0800 | [diff] [blame] | 508 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Eric Dumazet | 15c77d8 | 2013-12-05 21:38:06 -0800 | [diff] [blame] | 509 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
| 510 | IPSTATS_MIB_INTOOBIGERRORS); |
| 511 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
| 512 | IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | kfree_skb(skb); |
| 514 | return -EMSGSIZE; |
| 515 | } |
| 516 | |
| 517 | if (skb_cow(skb, dst->dev->hard_header_len)) { |
Eric Dumazet | 15c77d8 | 2013-12-05 21:38:06 -0800 | [diff] [blame] | 518 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), |
| 519 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | goto drop; |
| 521 | } |
| 522 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 523 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
| 525 | /* Mangling hops number delayed to point after skb COW */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 526 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | hdr->hop_limit--; |
| 528 | |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 529 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
Vincent Bernat | 2d8dbb0 | 2012-06-05 03:41:42 +0000 | [diff] [blame] | 530 | IP6_ADD_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTOCTETS, skb->len); |
Eric W. Biederman | 29a26a5 | 2015-09-15 20:04:16 -0500 | [diff] [blame] | 531 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, |
| 532 | net, NULL, skb, skb->dev, dst->dev, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 533 | ip6_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
| 535 | error: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 536 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | drop: |
| 538 | kfree_skb(skb); |
| 539 | return -EINVAL; |
| 540 | } |
| 541 | |
| 542 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) |
| 543 | { |
| 544 | to->pkt_type = from->pkt_type; |
| 545 | to->priority = from->priority; |
| 546 | to->protocol = from->protocol; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 547 | skb_dst_drop(to); |
| 548 | skb_dst_set(to, dst_clone(skb_dst(from))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | to->dev = from->dev; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 550 | to->mark = from->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
| 552 | #ifdef CONFIG_NET_SCHED |
| 553 | to->tc_index = from->tc_index; |
| 554 | #endif |
Yasuyuki Kozakai | e7ac05f | 2007-03-14 16:44:01 -0700 | [diff] [blame] | 555 | nf_copy(to, from); |
James Morris | 984bc16 | 2006-06-09 00:29:17 -0700 | [diff] [blame] | 556 | skb_copy_secmark(to, from); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | } |
| 558 | |
Eric W. Biederman | 7d8c6e3 | 2015-06-12 22:12:04 -0500 | [diff] [blame] | 559 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
| 560 | int (*output)(struct net *, struct sock *, struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | struct sk_buff *frag; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 563 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
hannes@stressinduktion.org | f60e599 | 2015-04-01 17:07:44 +0200 | [diff] [blame] | 564 | struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
| 565 | inet6_sk(skb->sk) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | struct ipv6hdr *tmp_hdr; |
| 567 | struct frag_hdr *fh; |
| 568 | unsigned int mtu, hlen, left, len; |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 569 | int hroom, troom; |
Martin KaFai Lau | 286c234 | 2015-05-22 20:55:56 -0700 | [diff] [blame] | 570 | __be32 frag_id; |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 571 | int ptr, offset = 0, err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | u8 *prevhdr, nexthdr = 0; |
| 573 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
| 575 | nexthdr = *prevhdr; |
| 576 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 577 | mtu = ip6_skb_dst_mtu(skb); |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 578 | |
| 579 | /* We must not fragment if the socket is set to force MTU discovery |
Ulrich Weber | 14f3ad6 | 2010-02-26 04:34:49 -0800 | [diff] [blame] | 580 | * or if the skb it not generated by a local socket. |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 581 | */ |
Florian Westphal | 485fca6 | 2015-05-22 00:44:16 +0200 | [diff] [blame] | 582 | if (unlikely(!skb->ignore_df && skb->len > mtu)) |
| 583 | goto fail_toobig; |
Eric Dumazet | a34a101 | 2012-05-18 21:51:44 +0000 | [diff] [blame] | 584 | |
Florian Westphal | 485fca6 | 2015-05-22 00:44:16 +0200 | [diff] [blame] | 585 | if (IP6CB(skb)->frag_max_size) { |
| 586 | if (IP6CB(skb)->frag_max_size > mtu) |
| 587 | goto fail_toobig; |
| 588 | |
| 589 | /* don't send fragments larger than what we received */ |
| 590 | mtu = IP6CB(skb)->frag_max_size; |
| 591 | if (mtu < IPV6_MIN_MTU) |
| 592 | mtu = IPV6_MIN_MTU; |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 593 | } |
| 594 | |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 595 | if (np && np->frag_size < mtu) { |
| 596 | if (np->frag_size) |
| 597 | mtu = np->frag_size; |
| 598 | } |
| 599 | mtu -= hlen + sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
Martin KaFai Lau | fd0273d | 2015-05-22 20:55:57 -0700 | [diff] [blame] | 601 | frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr, |
| 602 | &ipv6_hdr(skb)->saddr); |
Martin KaFai Lau | 286c234 | 2015-05-22 20:55:56 -0700 | [diff] [blame] | 603 | |
Florian Westphal | 1d325d2 | 2015-09-16 17:26:14 +0200 | [diff] [blame] | 604 | hroom = LL_RESERVED_SPACE(rt->dst.dev); |
David S. Miller | 21dc330 | 2010-08-23 00:13:46 -0700 | [diff] [blame] | 605 | if (skb_has_frag_list(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | int first_len = skb_pagelen(skb); |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 607 | struct sk_buff *frag2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
| 609 | if (first_len - hlen > mtu || |
| 610 | ((first_len - hlen) & 7) || |
Florian Westphal | 1d325d2 | 2015-09-16 17:26:14 +0200 | [diff] [blame] | 611 | skb_cloned(skb) || |
| 612 | skb_headroom(skb) < (hroom + sizeof(struct frag_hdr))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | goto slow_path; |
| 614 | |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 615 | skb_walk_frags(skb, frag) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | /* Correct geometry. */ |
| 617 | if (frag->len > mtu || |
| 618 | ((frag->len & 7) && frag->next) || |
Florian Westphal | 1d325d2 | 2015-09-16 17:26:14 +0200 | [diff] [blame] | 619 | skb_headroom(frag) < (hlen + hroom + sizeof(struct frag_hdr))) |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 620 | goto slow_path_clean; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | /* Partially cloned skb? */ |
| 623 | if (skb_shared(frag)) |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 624 | goto slow_path_clean; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 625 | |
| 626 | BUG_ON(frag->sk); |
| 627 | if (skb->sk) { |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 628 | frag->sk = skb->sk; |
| 629 | frag->destructor = sock_wfree; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 630 | } |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 631 | skb->truesize -= frag->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | } |
| 633 | |
| 634 | err = 0; |
| 635 | offset = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | /* BUILD HEADER */ |
| 637 | |
YOSHIFUJI Hideaki | 9a217a1 | 2006-12-05 13:47:21 -0800 | [diff] [blame] | 638 | *prevhdr = NEXTHDR_FRAGMENT; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 639 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | if (!tmp_hdr) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 641 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 642 | IPSTATS_MIB_FRAGFAILS); |
Florian Westphal | 1d325d2 | 2015-09-16 17:26:14 +0200 | [diff] [blame] | 643 | err = -ENOMEM; |
| 644 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
Florian Westphal | 1d325d2 | 2015-09-16 17:26:14 +0200 | [diff] [blame] | 646 | frag = skb_shinfo(skb)->frag_list; |
| 647 | skb_frag_list_init(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | __skb_pull(skb, hlen); |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 650 | fh = (struct frag_hdr *)__skb_push(skb, sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 651 | __skb_push(skb, hlen); |
| 652 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 653 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | fh->nexthdr = nexthdr; |
| 656 | fh->reserved = 0; |
| 657 | fh->frag_off = htons(IP6_MF); |
Martin KaFai Lau | 286c234 | 2015-05-22 20:55:56 -0700 | [diff] [blame] | 658 | fh->identification = frag_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
| 660 | first_len = skb_pagelen(skb); |
| 661 | skb->data_len = first_len - skb_headlen(skb); |
| 662 | skb->len = first_len; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 663 | ipv6_hdr(skb)->payload_len = htons(first_len - |
| 664 | sizeof(struct ipv6hdr)); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 665 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 666 | dst_hold(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
| 668 | for (;;) { |
| 669 | /* Prepare header of the next frame, |
| 670 | * before previous one went down. */ |
| 671 | if (frag) { |
| 672 | frag->ip_summed = CHECKSUM_NONE; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 673 | skb_reset_transport_header(frag); |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 674 | fh = (struct frag_hdr *)__skb_push(frag, sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 675 | __skb_push(frag, hlen); |
| 676 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 677 | memcpy(skb_network_header(frag), tmp_hdr, |
| 678 | hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
| 680 | fh->nexthdr = nexthdr; |
| 681 | fh->reserved = 0; |
| 682 | fh->frag_off = htons(offset); |
Ian Morris | 53b24b8 | 2015-03-29 14:00:05 +0100 | [diff] [blame] | 683 | if (frag->next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | fh->frag_off |= htons(IP6_MF); |
| 685 | fh->identification = frag_id; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 686 | ipv6_hdr(frag)->payload_len = |
| 687 | htons(frag->len - |
| 688 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | ip6_copy_metadata(frag, skb); |
| 690 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 691 | |
Eric W. Biederman | 7d8c6e3 | 2015-06-12 22:12:04 -0500 | [diff] [blame] | 692 | err = output(net, sk, skb); |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 693 | if (!err) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 694 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 695 | IPSTATS_MIB_FRAGCREATES); |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 696 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | if (err || !frag) |
| 698 | break; |
| 699 | |
| 700 | skb = frag; |
| 701 | frag = skb->next; |
| 702 | skb->next = NULL; |
| 703 | } |
| 704 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 705 | kfree(tmp_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | |
| 707 | if (err == 0) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 708 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 709 | IPSTATS_MIB_FRAGOKS); |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 710 | ip6_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | return 0; |
| 712 | } |
| 713 | |
Florian Westphal | 46cfd72 | 2014-09-10 01:08:46 +0200 | [diff] [blame] | 714 | kfree_skb_list(frag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 716 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 717 | IPSTATS_MIB_FRAGFAILS); |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 718 | ip6_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | return err; |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 720 | |
| 721 | slow_path_clean: |
| 722 | skb_walk_frags(skb, frag2) { |
| 723 | if (frag2 == frag) |
| 724 | break; |
| 725 | frag2->sk = NULL; |
| 726 | frag2->destructor = NULL; |
| 727 | skb->truesize += frag2->truesize; |
| 728 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | } |
| 730 | |
| 731 | slow_path: |
Eric Dumazet | 72e843b | 2012-05-18 11:02:15 +0000 | [diff] [blame] | 732 | if ((skb->ip_summed == CHECKSUM_PARTIAL) && |
| 733 | skb_checksum_help(skb)) |
| 734 | goto fail; |
| 735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | left = skb->len - hlen; /* Space per frame */ |
| 737 | ptr = hlen; /* Where to start from */ |
| 738 | |
| 739 | /* |
| 740 | * Fragment the datagram. |
| 741 | */ |
| 742 | |
| 743 | *prevhdr = NEXTHDR_FRAGMENT; |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 744 | troom = rt->dst.dev->needed_tailroom; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | |
| 746 | /* |
| 747 | * Keep copying data until we run out. |
| 748 | */ |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 749 | while (left > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | len = left; |
| 751 | /* IF: it doesn't fit, use 'mtu' - the data space left */ |
| 752 | if (len > mtu) |
| 753 | len = mtu; |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 754 | /* IF: we are not sending up to and including the packet end |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | then align the next start on an eight byte boundary */ |
| 756 | if (len < left) { |
| 757 | len &= ~7; |
| 758 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | |
Joe Perches | cbffccc | 2014-11-05 14:39:21 -0800 | [diff] [blame] | 760 | /* Allocate buffer */ |
| 761 | frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) + |
| 762 | hroom + troom, GFP_ATOMIC); |
| 763 | if (!frag) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 764 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 765 | IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | err = -ENOMEM; |
| 767 | goto fail; |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * Set up data on packet |
| 772 | */ |
| 773 | |
| 774 | ip6_copy_metadata(frag, skb); |
Herbert Xu | a7ae199 | 2011-11-18 02:20:04 +0000 | [diff] [blame] | 775 | skb_reserve(frag, hroom); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 777 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 778 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 779 | frag->transport_header = (frag->network_header + hlen + |
| 780 | sizeof(struct frag_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | |
| 782 | /* |
| 783 | * Charge the memory for the fragment to any owner |
| 784 | * it might possess |
| 785 | */ |
| 786 | if (skb->sk) |
| 787 | skb_set_owner_w(frag, skb->sk); |
| 788 | |
| 789 | /* |
| 790 | * Copy the packet header into the new buffer. |
| 791 | */ |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 792 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | |
| 794 | /* |
| 795 | * Build fragment header. |
| 796 | */ |
| 797 | fh->nexthdr = nexthdr; |
| 798 | fh->reserved = 0; |
Martin KaFai Lau | 286c234 | 2015-05-22 20:55:56 -0700 | [diff] [blame] | 799 | fh->identification = frag_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
| 801 | /* |
| 802 | * Copy a block of the IP datagram. |
| 803 | */ |
Himangi Saraogi | e3f0b86 | 2014-07-12 01:57:17 +0530 | [diff] [blame] | 804 | BUG_ON(skb_copy_bits(skb, ptr, skb_transport_header(frag), |
| 805 | len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | left -= len; |
| 807 | |
| 808 | fh->frag_off = htons(offset); |
| 809 | if (left > 0) |
| 810 | fh->frag_off |= htons(IP6_MF); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 811 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
| 812 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
| 814 | ptr += len; |
| 815 | offset += len; |
| 816 | |
| 817 | /* |
| 818 | * Put this fragment into the sending queue. |
| 819 | */ |
Eric W. Biederman | 7d8c6e3 | 2015-06-12 22:12:04 -0500 | [diff] [blame] | 820 | err = output(net, sk, frag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | if (err) |
| 822 | goto fail; |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 823 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 824 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 825 | IPSTATS_MIB_FRAGCREATES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 827 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 828 | IPSTATS_MIB_FRAGOKS); |
Eric Dumazet | 808db80 | 2012-04-24 10:17:59 +0000 | [diff] [blame] | 829 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | return err; |
| 831 | |
Florian Westphal | 485fca6 | 2015-05-22 00:44:16 +0200 | [diff] [blame] | 832 | fail_toobig: |
| 833 | if (skb->sk && dst_allfrag(skb_dst(skb))) |
| 834 | sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK); |
| 835 | |
| 836 | skb->dev = skb_dst(skb)->dev; |
| 837 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| 838 | err = -EMSGSIZE; |
| 839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | fail: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 841 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 842 | IPSTATS_MIB_FRAGFAILS); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 843 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | return err; |
| 845 | } |
| 846 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 847 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
| 848 | const struct in6_addr *fl_addr, |
| 849 | const struct in6_addr *addr_cache) |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 850 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 851 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 852 | (!addr_cache || !ipv6_addr_equal(fl_addr, addr_cache)); |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 853 | } |
| 854 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 855 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
| 856 | struct dst_entry *dst, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 857 | const struct flowi6 *fl6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 859 | struct ipv6_pinfo *np = inet6_sk(sk); |
Eric Dumazet | a963a37 | 2013-06-26 04:15:07 -0700 | [diff] [blame] | 860 | struct rt6_info *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 862 | if (!dst) |
| 863 | goto out; |
| 864 | |
Eric Dumazet | a963a37 | 2013-06-26 04:15:07 -0700 | [diff] [blame] | 865 | if (dst->ops->family != AF_INET6) { |
| 866 | dst_release(dst); |
| 867 | return NULL; |
| 868 | } |
| 869 | |
| 870 | rt = (struct rt6_info *)dst; |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 871 | /* Yes, checking route validity in not connected |
| 872 | * case is not very simple. Take into account, |
| 873 | * that we do not support routing by source, TOS, |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 874 | * and MSG_DONTROUTE --ANK (980726) |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 875 | * |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 876 | * 1. ip6_rt_check(): If route was host route, |
| 877 | * check that cached destination is current. |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 878 | * If it is network route, we still may |
| 879 | * check its validity using saved pointer |
| 880 | * to the last used address: daddr_cache. |
| 881 | * We do not want to save whole address now, |
| 882 | * (because main consumer of this service |
| 883 | * is tcp, which has not this problem), |
| 884 | * so that the last trick works only on connected |
| 885 | * sockets. |
| 886 | * 2. oif also should be the same. |
| 887 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 888 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 889 | #ifdef CONFIG_IPV6_SUBTREES |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 890 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 891 | #endif |
David Ahern | ca25449 | 2015-10-12 11:47:10 -0700 | [diff] [blame] | 892 | (!(fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) && |
| 893 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex))) { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 894 | dst_release(dst); |
| 895 | dst = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | } |
| 897 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 898 | out: |
| 899 | return dst; |
| 900 | } |
| 901 | |
Eric Dumazet | 3aef934 | 2015-09-25 07:39:12 -0700 | [diff] [blame] | 902 | static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 903 | struct dst_entry **dst, struct flowi6 *fl6) |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 904 | { |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 905 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| 906 | struct neighbour *n; |
David S. Miller | 97cac08 | 2012-07-02 22:43:47 -0700 | [diff] [blame] | 907 | struct rt6_info *rt; |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 908 | #endif |
| 909 | int err; |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 910 | |
Markus Stenberg | e16e888 | 2015-05-05 13:36:59 +0300 | [diff] [blame] | 911 | /* The correct way to handle this would be to do |
| 912 | * ip6_route_get_saddr, and then ip6_route_output; however, |
| 913 | * the route-specific preferred source forces the |
| 914 | * ip6_route_output call _before_ ip6_route_get_saddr. |
| 915 | * |
| 916 | * In source specific routing (no src=any default route), |
| 917 | * ip6_route_output will fail given src=any saddr, though, so |
| 918 | * that's why we try it again later. |
| 919 | */ |
| 920 | if (ipv6_addr_any(&fl6->saddr) && (!*dst || !(*dst)->error)) { |
| 921 | struct rt6_info *rt; |
| 922 | bool had_dst = *dst != NULL; |
| 923 | |
| 924 | if (!had_dst) |
| 925 | *dst = ip6_route_output(net, sk, fl6); |
| 926 | rt = (*dst)->error ? NULL : (struct rt6_info *)*dst; |
| 927 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, |
| 928 | sk ? inet6_sk(sk)->srcprefs : 0, |
| 929 | &fl6->saddr); |
| 930 | if (err) |
| 931 | goto out_err_release; |
| 932 | |
| 933 | /* If we had an erroneous initial result, pretend it |
| 934 | * never existed and let the SA-enabled version take |
| 935 | * over. |
| 936 | */ |
| 937 | if (!had_dst && (*dst)->error) { |
| 938 | dst_release(*dst); |
| 939 | *dst = NULL; |
| 940 | } |
| 941 | } |
| 942 | |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 943 | if (!*dst) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 944 | *dst = ip6_route_output(net, sk, fl6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 946 | err = (*dst)->error; |
| 947 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | goto out_err_release; |
| 949 | |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 950 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 951 | /* |
| 952 | * Here if the dst entry we've looked up |
| 953 | * has a neighbour entry that is in the INCOMPLETE |
| 954 | * state and the src address from the flow is |
| 955 | * marked as OPTIMISTIC, we release the found |
| 956 | * dst entry and replace it instead with the |
| 957 | * dst entry of the nexthop router |
| 958 | */ |
Eric Dumazet | c56bf6f | 2012-07-06 09:19:05 +0200 | [diff] [blame] | 959 | rt = (struct rt6_info *) *dst; |
YOSHIFUJI Hideaki / 吉藤英明 | 707be1f | 2013-01-17 12:53:55 +0000 | [diff] [blame] | 960 | rcu_read_lock_bh(); |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 961 | n = __ipv6_neigh_lookup_noref(rt->dst.dev, |
| 962 | rt6_nexthop(rt, &fl6->daddr)); |
YOSHIFUJI Hideaki / 吉藤英明 | 707be1f | 2013-01-17 12:53:55 +0000 | [diff] [blame] | 963 | err = n && !(n->nud_state & NUD_VALID) ? -EINVAL : 0; |
| 964 | rcu_read_unlock_bh(); |
| 965 | |
| 966 | if (err) { |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 967 | struct inet6_ifaddr *ifp; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 968 | struct flowi6 fl_gw6; |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 969 | int redirect; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 970 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 971 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 972 | (*dst)->dev, 1); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 973 | |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 974 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); |
| 975 | if (ifp) |
| 976 | in6_ifa_put(ifp); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 977 | |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 978 | if (redirect) { |
| 979 | /* |
| 980 | * We need to get the dst entry for the |
| 981 | * default router instead |
| 982 | */ |
| 983 | dst_release(*dst); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 984 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
| 985 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); |
| 986 | *dst = ip6_route_output(net, sk, &fl_gw6); |
Ian Morris | e5d08d7 | 2014-11-23 21:28:43 +0000 | [diff] [blame] | 987 | err = (*dst)->error; |
| 988 | if (err) |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 989 | goto out_err_release; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 990 | } |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 991 | } |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 992 | #endif |
| 993 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | return 0; |
| 995 | |
| 996 | out_err_release: |
Mitsuru Chinen | ca46f9c | 2007-12-05 22:31:47 -0800 | [diff] [blame] | 997 | if (err == -ENETUNREACH) |
John Stultz | 5ac68e7 | 2013-10-07 15:52:01 -0700 | [diff] [blame] | 998 | IP6_INC_STATS(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | dst_release(*dst); |
| 1000 | *dst = NULL; |
| 1001 | return err; |
| 1002 | } |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 1003 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1004 | /** |
| 1005 | * ip6_dst_lookup - perform route lookup on flow |
| 1006 | * @sk: socket which provides route info |
| 1007 | * @dst: pointer to dst_entry * for result |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1008 | * @fl6: flow to lookup |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1009 | * |
| 1010 | * This function performs a route lookup on the given flow. |
| 1011 | * |
| 1012 | * It returns zero on success, or a standard errno code on error. |
| 1013 | */ |
Roopa Prabhu | 343d60a | 2015-07-30 13:34:53 -0700 | [diff] [blame] | 1014 | int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst, |
| 1015 | struct flowi6 *fl6) |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1016 | { |
| 1017 | *dst = NULL; |
Roopa Prabhu | 343d60a | 2015-07-30 13:34:53 -0700 | [diff] [blame] | 1018 | return ip6_dst_lookup_tail(net, sk, dst, fl6); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1019 | } |
Arnaldo Carvalho de Melo | 3cf3dc6 | 2005-12-13 23:23:20 -0800 | [diff] [blame] | 1020 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
| 1021 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1022 | /** |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1023 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
| 1024 | * @sk: socket which provides route info |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1025 | * @fl6: flow to lookup |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1026 | * @final_dst: final destination address for ipsec lookup |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1027 | * |
| 1028 | * This function performs a route lookup on the given flow. |
| 1029 | * |
| 1030 | * It returns a valid dst pointer on success, or a pointer encoded |
| 1031 | * error code. |
| 1032 | */ |
Eric Dumazet | 3aef934 | 2015-09-25 07:39:12 -0700 | [diff] [blame] | 1033 | struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6, |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 1034 | const struct in6_addr *final_dst) |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1035 | { |
| 1036 | struct dst_entry *dst = NULL; |
| 1037 | int err; |
| 1038 | |
Roopa Prabhu | 343d60a | 2015-07-30 13:34:53 -0700 | [diff] [blame] | 1039 | err = ip6_dst_lookup_tail(sock_net(sk), sk, &dst, fl6); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1040 | if (err) |
| 1041 | return ERR_PTR(err); |
| 1042 | if (final_dst) |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1043 | fl6->daddr = *final_dst; |
Phil Sutter | a0a9f33 | 2015-07-15 21:56:26 +0200 | [diff] [blame] | 1044 | if (!fl6->flowi6_oif) |
David Ahern | ca25449 | 2015-10-12 11:47:10 -0700 | [diff] [blame] | 1045 | fl6->flowi6_oif = l3mdev_fib_oif(dst->dev); |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 1046 | |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 1047 | return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1048 | } |
| 1049 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); |
| 1050 | |
| 1051 | /** |
| 1052 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow |
| 1053 | * @sk: socket which provides the dst cache and route info |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1054 | * @fl6: flow to lookup |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1055 | * @final_dst: final destination address for ipsec lookup |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1056 | * |
| 1057 | * This function performs a route lookup on the given flow with the |
| 1058 | * possibility of using the cached route in the socket if it is valid. |
| 1059 | * It will take the socket dst lock when operating on the dst cache. |
| 1060 | * As a result, this function can only be used in process context. |
| 1061 | * |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1062 | * It returns a valid dst pointer on success, or a pointer encoded |
| 1063 | * error code. |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1064 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1065 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
Steffen Klassert | 0e0d44a | 2013-08-28 08:04:14 +0200 | [diff] [blame] | 1066 | const struct in6_addr *final_dst) |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1067 | { |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1068 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
| 1069 | int err; |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1070 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1071 | dst = ip6_sk_dst_check(sk, dst, fl6); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1072 | |
Roopa Prabhu | 343d60a | 2015-07-30 13:34:53 -0700 | [diff] [blame] | 1073 | err = ip6_dst_lookup_tail(sock_net(sk), sk, &dst, fl6); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1074 | if (err) |
| 1075 | return ERR_PTR(err); |
| 1076 | if (final_dst) |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1077 | fl6->daddr = *final_dst; |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 1078 | |
Steffen Klassert | f92ee61 | 2014-09-16 10:08:40 +0200 | [diff] [blame] | 1079 | return xfrm_lookup_route(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1080 | } |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1081 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1082 | |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 1083 | static inline int ip6_ufo_append_data(struct sock *sk, |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1084 | struct sk_buff_head *queue, |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1085 | int getfrag(void *from, char *to, int offset, int len, |
| 1086 | int odd, struct sk_buff *skb), |
| 1087 | void *from, int length, int hh_len, int fragheaderlen, |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 1088 | int transhdrlen, int mtu, unsigned int flags, |
Martin KaFai Lau | fd0273d | 2015-05-22 20:55:57 -0700 | [diff] [blame] | 1089 | const struct flowi6 *fl6) |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1090 | |
| 1091 | { |
| 1092 | struct sk_buff *skb; |
| 1093 | int err; |
| 1094 | |
| 1095 | /* There is support for UDP large send offload by network |
| 1096 | * device, so create one single skb packet containing complete |
| 1097 | * udp datagram |
| 1098 | */ |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1099 | skb = skb_peek_tail(queue); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1100 | if (!skb) { |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1101 | skb = sock_alloc_send_skb(sk, |
| 1102 | hh_len + fragheaderlen + transhdrlen + 20, |
| 1103 | (flags & MSG_DONTWAIT), &err); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1104 | if (!skb) |
Zheng Yan | 504744e | 2011-10-28 00:26:00 -0400 | [diff] [blame] | 1105 | return err; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1106 | |
| 1107 | /* reserve space for Hardware header */ |
| 1108 | skb_reserve(skb, hh_len); |
| 1109 | |
| 1110 | /* create space for UDP/IP header */ |
Ian Morris | 67ba415 | 2014-08-24 21:53:10 +0100 | [diff] [blame] | 1111 | skb_put(skb, fragheaderlen + transhdrlen); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1112 | |
| 1113 | /* initialize network header pointer */ |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1114 | skb_reset_network_header(skb); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1115 | |
| 1116 | /* initialize protocol header pointer */ |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1117 | skb->transport_header = skb->network_header + fragheaderlen; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1118 | |
Hannes Frederic Sowa | 9c9c9ad | 2013-08-26 12:31:23 +0200 | [diff] [blame] | 1119 | skb->protocol = htons(ETH_P_IPV6); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1120 | skb->csum = 0; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1121 | |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1122 | __skb_queue_tail(queue, skb); |
Jiri Pirko | c547dbf | 2013-10-19 12:29:16 +0200 | [diff] [blame] | 1123 | } else if (skb_is_gso(skb)) { |
| 1124 | goto append; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1125 | } |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1126 | |
Jiri Pirko | c547dbf | 2013-10-19 12:29:16 +0200 | [diff] [blame] | 1127 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 1128 | /* Specify the length of each IPv6 datagram fragment. |
| 1129 | * It has to be a multiple of 8. |
| 1130 | */ |
| 1131 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - |
| 1132 | sizeof(struct frag_hdr)) & ~7; |
| 1133 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
Martin KaFai Lau | fd0273d | 2015-05-22 20:55:57 -0700 | [diff] [blame] | 1134 | skb_shinfo(skb)->ip6_frag_id = ipv6_select_ident(sock_net(sk), |
| 1135 | &fl6->daddr, |
| 1136 | &fl6->saddr); |
Jiri Pirko | c547dbf | 2013-10-19 12:29:16 +0200 | [diff] [blame] | 1137 | |
| 1138 | append: |
Hannes Frederic Sowa | 2811eba | 2013-09-21 06:27:00 +0200 | [diff] [blame] | 1139 | return skb_append_datato_frags(sk, skb, getfrag, from, |
| 1140 | (length - transhdrlen)); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1141 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1143 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
| 1144 | gfp_t gfp) |
| 1145 | { |
| 1146 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
| 1147 | } |
| 1148 | |
| 1149 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, |
| 1150 | gfp_t gfp) |
| 1151 | { |
| 1152 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
| 1153 | } |
| 1154 | |
Hannes Frederic Sowa | 75a493e | 2013-07-02 08:04:05 +0200 | [diff] [blame] | 1155 | static void ip6_append_data_mtu(unsigned int *mtu, |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1156 | int *maxfraglen, |
| 1157 | unsigned int fragheaderlen, |
| 1158 | struct sk_buff *skb, |
Hannes Frederic Sowa | 75a493e | 2013-07-02 08:04:05 +0200 | [diff] [blame] | 1159 | struct rt6_info *rt, |
lucien | e367c2d | 2014-03-17 12:51:01 +0800 | [diff] [blame] | 1160 | unsigned int orig_mtu) |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1161 | { |
| 1162 | if (!(rt->dst.flags & DST_XFRM_TUNNEL)) { |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1163 | if (!skb) { |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1164 | /* first fragment, reserve header_len */ |
lucien | e367c2d | 2014-03-17 12:51:01 +0800 | [diff] [blame] | 1165 | *mtu = orig_mtu - rt->dst.header_len; |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1166 | |
| 1167 | } else { |
| 1168 | /* |
| 1169 | * this fragment is not first, the headers |
| 1170 | * space is regarded as data space. |
| 1171 | */ |
lucien | e367c2d | 2014-03-17 12:51:01 +0800 | [diff] [blame] | 1172 | *mtu = orig_mtu; |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1173 | } |
| 1174 | *maxfraglen = ((*mtu - fragheaderlen) & ~7) |
| 1175 | + fragheaderlen - sizeof(struct frag_hdr); |
| 1176 | } |
| 1177 | } |
| 1178 | |
Vlad Yasevich | 366e41d | 2015-01-31 10:40:13 -0500 | [diff] [blame] | 1179 | static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork, |
| 1180 | struct inet6_cork *v6_cork, |
| 1181 | int hlimit, int tclass, struct ipv6_txoptions *opt, |
| 1182 | struct rt6_info *rt, struct flowi6 *fl6) |
| 1183 | { |
| 1184 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1185 | unsigned int mtu; |
| 1186 | |
| 1187 | /* |
| 1188 | * setup for corking |
| 1189 | */ |
| 1190 | if (opt) { |
| 1191 | if (WARN_ON(v6_cork->opt)) |
| 1192 | return -EINVAL; |
| 1193 | |
| 1194 | v6_cork->opt = kzalloc(opt->tot_len, sk->sk_allocation); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1195 | if (unlikely(!v6_cork->opt)) |
Vlad Yasevich | 366e41d | 2015-01-31 10:40:13 -0500 | [diff] [blame] | 1196 | return -ENOBUFS; |
| 1197 | |
| 1198 | v6_cork->opt->tot_len = opt->tot_len; |
| 1199 | v6_cork->opt->opt_flen = opt->opt_flen; |
| 1200 | v6_cork->opt->opt_nflen = opt->opt_nflen; |
| 1201 | |
| 1202 | v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt, |
| 1203 | sk->sk_allocation); |
| 1204 | if (opt->dst0opt && !v6_cork->opt->dst0opt) |
| 1205 | return -ENOBUFS; |
| 1206 | |
| 1207 | v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt, |
| 1208 | sk->sk_allocation); |
| 1209 | if (opt->dst1opt && !v6_cork->opt->dst1opt) |
| 1210 | return -ENOBUFS; |
| 1211 | |
| 1212 | v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt, |
| 1213 | sk->sk_allocation); |
| 1214 | if (opt->hopopt && !v6_cork->opt->hopopt) |
| 1215 | return -ENOBUFS; |
| 1216 | |
| 1217 | v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt, |
| 1218 | sk->sk_allocation); |
| 1219 | if (opt->srcrt && !v6_cork->opt->srcrt) |
| 1220 | return -ENOBUFS; |
| 1221 | |
| 1222 | /* need source address above miyazawa*/ |
| 1223 | } |
| 1224 | dst_hold(&rt->dst); |
| 1225 | cork->base.dst = &rt->dst; |
| 1226 | cork->fl.u.ip6 = *fl6; |
| 1227 | v6_cork->hop_limit = hlimit; |
| 1228 | v6_cork->tclass = tclass; |
| 1229 | if (rt->dst.flags & DST_XFRM_TUNNEL) |
| 1230 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? |
| 1231 | rt->dst.dev->mtu : dst_mtu(&rt->dst); |
| 1232 | else |
| 1233 | mtu = np->pmtudisc >= IPV6_PMTUDISC_PROBE ? |
| 1234 | rt->dst.dev->mtu : dst_mtu(rt->dst.path); |
| 1235 | if (np->frag_size < mtu) { |
| 1236 | if (np->frag_size) |
| 1237 | mtu = np->frag_size; |
| 1238 | } |
| 1239 | cork->base.fragsize = mtu; |
| 1240 | if (dst_allfrag(rt->dst.path)) |
| 1241 | cork->base.flags |= IPCORK_ALLFRAG; |
| 1242 | cork->base.length = 0; |
| 1243 | |
| 1244 | return 0; |
| 1245 | } |
| 1246 | |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1247 | static int __ip6_append_data(struct sock *sk, |
| 1248 | struct flowi6 *fl6, |
| 1249 | struct sk_buff_head *queue, |
| 1250 | struct inet_cork *cork, |
| 1251 | struct inet6_cork *v6_cork, |
| 1252 | struct page_frag *pfrag, |
| 1253 | int getfrag(void *from, char *to, int offset, |
| 1254 | int len, int odd, struct sk_buff *skb), |
| 1255 | void *from, int length, int transhdrlen, |
| 1256 | unsigned int flags, int dontfrag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | { |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1258 | struct sk_buff *skb, *skb_prev = NULL; |
lucien | e367c2d | 2014-03-17 12:51:01 +0800 | [diff] [blame] | 1259 | unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu; |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1260 | int exthdrlen = 0; |
| 1261 | int dst_exthdrlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | int hh_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | int copy; |
| 1264 | int err; |
| 1265 | int offset = 0; |
Anders Berggren | a693e69 | 2011-02-28 12:32:11 -0800 | [diff] [blame] | 1266 | __u8 tx_flags = 0; |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 1267 | u32 tskey = 0; |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1268 | struct rt6_info *rt = (struct rt6_info *)cork->dst; |
| 1269 | struct ipv6_txoptions *opt = v6_cork->opt; |
Vlad Yasevich | 32dce96 | 2015-01-31 10:40:18 -0500 | [diff] [blame] | 1270 | int csummode = CHECKSUM_NONE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1272 | skb = skb_peek_tail(queue); |
| 1273 | if (!skb) { |
| 1274 | exthdrlen = opt ? opt->opt_flen : 0; |
Romain KUNTZ | 7efdba5b | 2013-01-16 12:47:40 +0000 | [diff] [blame] | 1275 | dst_exthdrlen = rt->dst.header_len - rt->rt6i_nfheader_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | } |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1277 | |
Vlad Yasevich | 366e41d | 2015-01-31 10:40:13 -0500 | [diff] [blame] | 1278 | mtu = cork->fragsize; |
lucien | e367c2d | 2014-03-17 12:51:01 +0800 | [diff] [blame] | 1279 | orig_mtu = mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1281 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1283 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
Herbert Xu | b4ce927 | 2007-11-13 21:33:32 -0800 | [diff] [blame] | 1284 | (opt ? opt->opt_nflen : 0); |
Hannes Frederic Sowa | 4df98e7 | 2013-12-16 12:36:44 +0100 | [diff] [blame] | 1285 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - |
| 1286 | sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | |
| 1288 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { |
Hannes Frederic Sowa | 4df98e7 | 2013-12-16 12:36:44 +0100 | [diff] [blame] | 1289 | unsigned int maxnonfragsize, headersize; |
| 1290 | |
| 1291 | headersize = sizeof(struct ipv6hdr) + |
Hannes Frederic Sowa | 3a1cebe | 2014-05-11 23:01:13 +0200 | [diff] [blame] | 1292 | (opt ? opt->opt_flen + opt->opt_nflen : 0) + |
Hannes Frederic Sowa | 4df98e7 | 2013-12-16 12:36:44 +0100 | [diff] [blame] | 1293 | (dst_allfrag(&rt->dst) ? |
| 1294 | sizeof(struct frag_hdr) : 0) + |
| 1295 | rt->rt6i_nfheader_len; |
| 1296 | |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 1297 | if (ip6_sk_ignore_df(sk)) |
Hannes Frederic Sowa | 0b95227 | 2014-02-26 01:20:43 +0100 | [diff] [blame] | 1298 | maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN; |
| 1299 | else |
| 1300 | maxnonfragsize = mtu; |
Hannes Frederic Sowa | 4df98e7 | 2013-12-16 12:36:44 +0100 | [diff] [blame] | 1301 | |
| 1302 | /* dontfrag active */ |
| 1303 | if ((cork->length + length > mtu - headersize) && dontfrag && |
| 1304 | (sk->sk_protocol == IPPROTO_UDP || |
| 1305 | sk->sk_protocol == IPPROTO_RAW)) { |
| 1306 | ipv6_local_rxpmtu(sk, fl6, mtu - headersize + |
| 1307 | sizeof(struct ipv6hdr)); |
| 1308 | goto emsgsize; |
| 1309 | } |
| 1310 | |
| 1311 | if (cork->length + length > maxnonfragsize - headersize) { |
| 1312 | emsgsize: |
| 1313 | ipv6_local_error(sk, EMSGSIZE, fl6, |
| 1314 | mtu - headersize + |
| 1315 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | return -EMSGSIZE; |
| 1317 | } |
| 1318 | } |
| 1319 | |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 1320 | if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_RAW) { |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 1321 | sock_tx_timestamp(sk, &tx_flags); |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 1322 | if (tx_flags & SKBTX_ANY_SW_TSTAMP && |
| 1323 | sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) |
| 1324 | tskey = sk->sk_tskey++; |
| 1325 | } |
Anders Berggren | a693e69 | 2011-02-28 12:32:11 -0800 | [diff] [blame] | 1326 | |
Vlad Yasevich | 32dce96 | 2015-01-31 10:40:18 -0500 | [diff] [blame] | 1327 | /* If this is the first and only packet and device |
| 1328 | * supports checksum offloading, let's use it. |
Vlad Yasevich | e87a468 | 2015-05-14 20:34:08 -0400 | [diff] [blame] | 1329 | * Use transhdrlen, same as IPv4, because partial |
| 1330 | * sums only work when transhdrlen is set. |
Vlad Yasevich | 32dce96 | 2015-01-31 10:40:18 -0500 | [diff] [blame] | 1331 | */ |
Vlad Yasevich | e87a468 | 2015-05-14 20:34:08 -0400 | [diff] [blame] | 1332 | if (transhdrlen && sk->sk_protocol == IPPROTO_UDP && |
Vlad Yasevich | 32dce96 | 2015-01-31 10:40:18 -0500 | [diff] [blame] | 1333 | length + fragheaderlen < mtu && |
| 1334 | rt->dst.dev->features & NETIF_F_V6_CSUM && |
| 1335 | !exthdrlen) |
| 1336 | csummode = CHECKSUM_PARTIAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | /* |
| 1338 | * Let's try using as much space as possible. |
| 1339 | * Use MTU if total length of the message fits into the MTU. |
| 1340 | * Otherwise, we need to reserve fragment header and |
| 1341 | * fragment alignment (= 8-15 octects, in total). |
| 1342 | * |
| 1343 | * Note that we may need to "move" the data from the tail of |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1344 | * of the buffer to the new fragment when we split |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | * the message. |
| 1346 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1347 | * FIXME: It may be fragmented into multiple chunks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | * at once if non-fragmentable extension headers |
| 1349 | * are too large. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1350 | * --yoshfuji |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | */ |
| 1352 | |
Hannes Frederic Sowa | 2811eba | 2013-09-21 06:27:00 +0200 | [diff] [blame] | 1353 | cork->length += length; |
| 1354 | if (((length > mtu) || |
| 1355 | (skb && skb_is_gso(skb))) && |
| 1356 | (sk->sk_protocol == IPPROTO_UDP) && |
Michal Kubeček | acf8dd0 | 2015-03-02 18:27:11 +0100 | [diff] [blame] | 1357 | (rt->dst.dev->features & NETIF_F_UFO) && |
| 1358 | (sk->sk_type == SOCK_DGRAM)) { |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1359 | err = ip6_ufo_append_data(sk, queue, getfrag, from, length, |
Hannes Frederic Sowa | 2811eba | 2013-09-21 06:27:00 +0200 | [diff] [blame] | 1360 | hh_len, fragheaderlen, |
Martin KaFai Lau | fd0273d | 2015-05-22 20:55:57 -0700 | [diff] [blame] | 1361 | transhdrlen, mtu, flags, fl6); |
Hannes Frederic Sowa | 2811eba | 2013-09-21 06:27:00 +0200 | [diff] [blame] | 1362 | if (err) |
| 1363 | goto error; |
| 1364 | return 0; |
| 1365 | } |
| 1366 | |
| 1367 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | goto alloc_new_skb; |
| 1369 | |
| 1370 | while (length > 0) { |
| 1371 | /* Check if the remaining data fits into current packet. */ |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1372 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | if (copy < length) |
| 1374 | copy = maxfraglen - skb->len; |
| 1375 | |
| 1376 | if (copy <= 0) { |
| 1377 | char *data; |
| 1378 | unsigned int datalen; |
| 1379 | unsigned int fraglen; |
| 1380 | unsigned int fraggap; |
| 1381 | unsigned int alloclen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | alloc_new_skb: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | /* There's no room in the current skb */ |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1384 | if (skb) |
| 1385 | fraggap = skb->len - maxfraglen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | else |
| 1387 | fraggap = 0; |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1388 | /* update mtu and maxfraglen if necessary */ |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1389 | if (!skb || !skb_prev) |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1390 | ip6_append_data_mtu(&mtu, &maxfraglen, |
Hannes Frederic Sowa | 75a493e | 2013-07-02 08:04:05 +0200 | [diff] [blame] | 1391 | fragheaderlen, skb, rt, |
lucien | e367c2d | 2014-03-17 12:51:01 +0800 | [diff] [blame] | 1392 | orig_mtu); |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1393 | |
| 1394 | skb_prev = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | |
| 1396 | /* |
| 1397 | * If remaining data exceeds the mtu, |
| 1398 | * we know we need more fragment(s). |
| 1399 | */ |
| 1400 | datalen = length + fraggap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1402 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
| 1403 | datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | if ((flags & MSG_MORE) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1405 | !(rt->dst.dev->features&NETIF_F_SG)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | alloclen = mtu; |
| 1407 | else |
| 1408 | alloclen = datalen + fragheaderlen; |
| 1409 | |
Steffen Klassert | 299b076 | 2011-10-11 01:43:33 +0000 | [diff] [blame] | 1410 | alloclen += dst_exthdrlen; |
| 1411 | |
Gao feng | 0c18337 | 2012-05-26 01:30:53 +0000 | [diff] [blame] | 1412 | if (datalen != length + fraggap) { |
| 1413 | /* |
| 1414 | * this is not the last fragment, the trailer |
| 1415 | * space is regarded as data space. |
| 1416 | */ |
| 1417 | datalen += rt->dst.trailer_len; |
| 1418 | } |
| 1419 | |
| 1420 | alloclen += rt->dst.trailer_len; |
| 1421 | fraglen = datalen + fragheaderlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | |
| 1423 | /* |
| 1424 | * We just reserve space for fragment header. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1425 | * Note: this may be overallocation if the message |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | * (without MSG_MORE) fits into the MTU. |
| 1427 | */ |
| 1428 | alloclen += sizeof(struct frag_hdr); |
| 1429 | |
| 1430 | if (transhdrlen) { |
| 1431 | skb = sock_alloc_send_skb(sk, |
| 1432 | alloclen + hh_len, |
| 1433 | (flags & MSG_DONTWAIT), &err); |
| 1434 | } else { |
| 1435 | skb = NULL; |
| 1436 | if (atomic_read(&sk->sk_wmem_alloc) <= |
| 1437 | 2 * sk->sk_sndbuf) |
| 1438 | skb = sock_wmalloc(sk, |
| 1439 | alloclen + hh_len, 1, |
| 1440 | sk->sk_allocation); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1441 | if (unlikely(!skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | err = -ENOBUFS; |
| 1443 | } |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1444 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | goto error; |
| 1446 | /* |
| 1447 | * Fill in the control structures |
| 1448 | */ |
Hannes Frederic Sowa | 9c9c9ad | 2013-08-26 12:31:23 +0200 | [diff] [blame] | 1449 | skb->protocol = htons(ETH_P_IPV6); |
Vlad Yasevich | 32dce96 | 2015-01-31 10:40:18 -0500 | [diff] [blame] | 1450 | skb->ip_summed = csummode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1451 | skb->csum = 0; |
Gao feng | 1f85851 | 2012-03-19 22:36:10 +0000 | [diff] [blame] | 1452 | /* reserve for fragmentation and ipsec header */ |
| 1453 | skb_reserve(skb, hh_len + sizeof(struct frag_hdr) + |
| 1454 | dst_exthdrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | |
Willem de Bruijn | 11878b4 | 2014-07-14 17:55:06 -0400 | [diff] [blame] | 1456 | /* Only the initial fragment is time stamped */ |
| 1457 | skb_shinfo(skb)->tx_flags = tx_flags; |
| 1458 | tx_flags = 0; |
Willem de Bruijn | 09c2d25 | 2014-08-04 22:11:47 -0400 | [diff] [blame] | 1459 | skb_shinfo(skb)->tskey = tskey; |
| 1460 | tskey = 0; |
Anders Berggren | a693e69 | 2011-02-28 12:32:11 -0800 | [diff] [blame] | 1461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | /* |
| 1463 | * Find where to start putting bytes |
| 1464 | */ |
Gao feng | 1f85851 | 2012-03-19 22:36:10 +0000 | [diff] [blame] | 1465 | data = skb_put(skb, fraglen); |
| 1466 | skb_set_network_header(skb, exthdrlen); |
| 1467 | data += fragheaderlen; |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1468 | skb->transport_header = (skb->network_header + |
| 1469 | fragheaderlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | if (fraggap) { |
| 1471 | skb->csum = skb_copy_and_csum_bits( |
| 1472 | skb_prev, maxfraglen, |
| 1473 | data + transhdrlen, fraggap, 0); |
| 1474 | skb_prev->csum = csum_sub(skb_prev->csum, |
| 1475 | skb->csum); |
| 1476 | data += fraggap; |
Herbert Xu | e9fa4f7 | 2006-08-13 20:12:58 -0700 | [diff] [blame] | 1477 | pskb_trim_unique(skb_prev, maxfraglen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1478 | } |
| 1479 | copy = datalen - transhdrlen - fraggap; |
Steffen Klassert | 299b076 | 2011-10-11 01:43:33 +0000 | [diff] [blame] | 1480 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | if (copy < 0) { |
| 1482 | err = -EINVAL; |
| 1483 | kfree_skb(skb); |
| 1484 | goto error; |
| 1485 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { |
| 1486 | err = -EFAULT; |
| 1487 | kfree_skb(skb); |
| 1488 | goto error; |
| 1489 | } |
| 1490 | |
| 1491 | offset += copy; |
| 1492 | length -= datalen - fraggap; |
| 1493 | transhdrlen = 0; |
| 1494 | exthdrlen = 0; |
Steffen Klassert | 299b076 | 2011-10-11 01:43:33 +0000 | [diff] [blame] | 1495 | dst_exthdrlen = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | |
| 1497 | /* |
| 1498 | * Put the packet on the pending queue |
| 1499 | */ |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1500 | __skb_queue_tail(queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | continue; |
| 1502 | } |
| 1503 | |
| 1504 | if (copy > length) |
| 1505 | copy = length; |
| 1506 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1507 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | unsigned int off; |
| 1509 | |
| 1510 | off = skb->len; |
| 1511 | if (getfrag(from, skb_put(skb, copy), |
| 1512 | offset, copy, off, skb) < 0) { |
| 1513 | __skb_trim(skb, off); |
| 1514 | err = -EFAULT; |
| 1515 | goto error; |
| 1516 | } |
| 1517 | } else { |
| 1518 | int i = skb_shinfo(skb)->nr_frags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1520 | err = -ENOMEM; |
| 1521 | if (!sk_page_frag_refill(sk, pfrag)) |
| 1522 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1524 | if (!skb_can_coalesce(skb, i, pfrag->page, |
| 1525 | pfrag->offset)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | err = -EMSGSIZE; |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1527 | if (i == MAX_SKB_FRAGS) |
| 1528 | goto error; |
| 1529 | |
| 1530 | __skb_fill_page_desc(skb, i, pfrag->page, |
| 1531 | pfrag->offset, 0); |
| 1532 | skb_shinfo(skb)->nr_frags = ++i; |
| 1533 | get_page(pfrag->page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1534 | } |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1535 | copy = min_t(int, copy, pfrag->size - pfrag->offset); |
Eric Dumazet | 9e903e0 | 2011-10-18 21:00:24 +0000 | [diff] [blame] | 1536 | if (getfrag(from, |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1537 | page_address(pfrag->page) + pfrag->offset, |
| 1538 | offset, copy, skb->len, skb) < 0) |
| 1539 | goto error_efault; |
| 1540 | |
| 1541 | pfrag->offset += copy; |
| 1542 | skb_frag_size_add(&skb_shinfo(skb)->frags[i - 1], copy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | skb->len += copy; |
| 1544 | skb->data_len += copy; |
Herbert Xu | f945fa7 | 2008-01-22 22:39:26 -0800 | [diff] [blame] | 1545 | skb->truesize += copy; |
| 1546 | atomic_add(copy, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | } |
| 1548 | offset += copy; |
| 1549 | length -= copy; |
| 1550 | } |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1551 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | return 0; |
Eric Dumazet | 5640f76 | 2012-09-23 23:04:42 +0000 | [diff] [blame] | 1553 | |
| 1554 | error_efault: |
| 1555 | err = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | error: |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1557 | cork->length -= length; |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 1558 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | return err; |
| 1560 | } |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1561 | |
| 1562 | int ip6_append_data(struct sock *sk, |
| 1563 | int getfrag(void *from, char *to, int offset, int len, |
| 1564 | int odd, struct sk_buff *skb), |
| 1565 | void *from, int length, int transhdrlen, int hlimit, |
| 1566 | int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, |
| 1567 | struct rt6_info *rt, unsigned int flags, int dontfrag) |
| 1568 | { |
| 1569 | struct inet_sock *inet = inet_sk(sk); |
| 1570 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1571 | int exthdrlen; |
| 1572 | int err; |
| 1573 | |
| 1574 | if (flags&MSG_PROBE) |
| 1575 | return 0; |
| 1576 | if (skb_queue_empty(&sk->sk_write_queue)) { |
| 1577 | /* |
| 1578 | * setup for corking |
| 1579 | */ |
| 1580 | err = ip6_setup_cork(sk, &inet->cork, &np->cork, hlimit, |
| 1581 | tclass, opt, rt, fl6); |
| 1582 | if (err) |
| 1583 | return err; |
| 1584 | |
| 1585 | exthdrlen = (opt ? opt->opt_flen : 0); |
| 1586 | length += exthdrlen; |
| 1587 | transhdrlen += exthdrlen; |
| 1588 | } else { |
| 1589 | fl6 = &inet->cork.fl.u.ip6; |
| 1590 | transhdrlen = 0; |
| 1591 | } |
| 1592 | |
| 1593 | return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base, |
| 1594 | &np->cork, sk_page_frag(sk), getfrag, |
| 1595 | from, length, transhdrlen, flags, dontfrag); |
| 1596 | } |
Chris Elston | a495f83 | 2012-04-29 21:48:53 +0000 | [diff] [blame] | 1597 | EXPORT_SYMBOL_GPL(ip6_append_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | |
Vlad Yasevich | 366e41d | 2015-01-31 10:40:13 -0500 | [diff] [blame] | 1599 | static void ip6_cork_release(struct inet_cork_full *cork, |
| 1600 | struct inet6_cork *v6_cork) |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1601 | { |
Vlad Yasevich | 366e41d | 2015-01-31 10:40:13 -0500 | [diff] [blame] | 1602 | if (v6_cork->opt) { |
| 1603 | kfree(v6_cork->opt->dst0opt); |
| 1604 | kfree(v6_cork->opt->dst1opt); |
| 1605 | kfree(v6_cork->opt->hopopt); |
| 1606 | kfree(v6_cork->opt->srcrt); |
| 1607 | kfree(v6_cork->opt); |
| 1608 | v6_cork->opt = NULL; |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1609 | } |
| 1610 | |
Vlad Yasevich | 366e41d | 2015-01-31 10:40:13 -0500 | [diff] [blame] | 1611 | if (cork->base.dst) { |
| 1612 | dst_release(cork->base.dst); |
| 1613 | cork->base.dst = NULL; |
| 1614 | cork->base.flags &= ~IPCORK_ALLFRAG; |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1615 | } |
Vlad Yasevich | 366e41d | 2015-01-31 10:40:13 -0500 | [diff] [blame] | 1616 | memset(&cork->fl, 0, sizeof(cork->fl)); |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1617 | } |
| 1618 | |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1619 | struct sk_buff *__ip6_make_skb(struct sock *sk, |
| 1620 | struct sk_buff_head *queue, |
| 1621 | struct inet_cork_full *cork, |
| 1622 | struct inet6_cork *v6_cork) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | { |
| 1624 | struct sk_buff *skb, *tmp_skb; |
| 1625 | struct sk_buff **tail_skb; |
| 1626 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | struct ipv6_pinfo *np = inet6_sk(sk); |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 1628 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | struct ipv6hdr *hdr; |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1630 | struct ipv6_txoptions *opt = v6_cork->opt; |
| 1631 | struct rt6_info *rt = (struct rt6_info *)cork->base.dst; |
| 1632 | struct flowi6 *fl6 = &cork->fl.u.ip6; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1633 | unsigned char proto = fl6->flowi6_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1635 | skb = __skb_dequeue(queue); |
Ian Morris | 63159f2 | 2015-03-29 14:00:04 +0100 | [diff] [blame] | 1636 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | goto out; |
| 1638 | tail_skb = &(skb_shinfo(skb)->frag_list); |
| 1639 | |
| 1640 | /* move skb->data to ip header from ext header */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1641 | if (skb->data < skb_network_header(skb)) |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1642 | __skb_pull(skb, skb_network_offset(skb)); |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1643 | while ((tmp_skb = __skb_dequeue(queue)) != NULL) { |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1644 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | *tail_skb = tmp_skb; |
| 1646 | tail_skb = &(tmp_skb->next); |
| 1647 | skb->len += tmp_skb->len; |
| 1648 | skb->data_len += tmp_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | skb->truesize += tmp_skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | tmp_skb->destructor = NULL; |
| 1651 | tmp_skb->sk = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1652 | } |
| 1653 | |
Herbert Xu | 28a89453 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1654 | /* Allow local fragmentation. */ |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 1655 | skb->ignore_df = ip6_sk_ignore_df(sk); |
Herbert Xu | 28a89453 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1656 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1657 | *final_dst = fl6->daddr; |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1658 | __skb_pull(skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | if (opt && opt->opt_flen) |
| 1660 | ipv6_push_frag_opts(skb, opt, &proto); |
| 1661 | if (opt && opt->opt_nflen) |
| 1662 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); |
| 1663 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 1664 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 1665 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1666 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1667 | |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1668 | ip6_flow_hdr(hdr, v6_cork->tclass, |
Tom Herbert | cb1ce2e | 2014-07-01 21:33:10 -0700 | [diff] [blame] | 1669 | ip6_make_flowlabel(net, skb, fl6->flowlabel, |
Tom Herbert | 67800f9 | 2015-07-31 16:52:11 -0700 | [diff] [blame] | 1670 | np->autoflowlabel, fl6)); |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1671 | hdr->hop_limit = v6_cork->hop_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | hdr->nexthdr = proto; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 1673 | hdr->saddr = fl6->saddr; |
| 1674 | hdr->daddr = *final_dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1676 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1677 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1678 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1679 | skb_dst_set(skb, dst_clone(&rt->dst)); |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 1680 | IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1681 | if (proto == IPPROTO_ICMPV6) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1682 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1683 | |
Hannes Frederic Sowa | 43a43b6 | 2014-03-31 20:14:10 +0200 | [diff] [blame] | 1684 | ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type); |
| 1685 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1686 | } |
| 1687 | |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1688 | ip6_cork_release(cork, v6_cork); |
| 1689 | out: |
| 1690 | return skb; |
| 1691 | } |
| 1692 | |
| 1693 | int ip6_send_skb(struct sk_buff *skb) |
| 1694 | { |
| 1695 | struct net *net = sock_net(skb->sk); |
| 1696 | struct rt6_info *rt = (struct rt6_info *)skb_dst(skb); |
| 1697 | int err; |
| 1698 | |
Eric W. Biederman | 33224b1 | 2015-10-07 16:48:46 -0500 | [diff] [blame] | 1699 | err = ip6_local_out(net, skb->sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | if (err) { |
| 1701 | if (err > 0) |
Eric Dumazet | 6ce9e7b | 2009-09-02 18:05:33 -0700 | [diff] [blame] | 1702 | err = net_xmit_errno(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1703 | if (err) |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1704 | IP6_INC_STATS(net, rt->rt6i_idev, |
| 1705 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | } |
| 1707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | return err; |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1709 | } |
| 1710 | |
| 1711 | int ip6_push_pending_frames(struct sock *sk) |
| 1712 | { |
| 1713 | struct sk_buff *skb; |
| 1714 | |
| 1715 | skb = ip6_finish_skb(sk); |
| 1716 | if (!skb) |
| 1717 | return 0; |
| 1718 | |
| 1719 | return ip6_send_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | } |
Chris Elston | a495f83 | 2012-04-29 21:48:53 +0000 | [diff] [blame] | 1721 | EXPORT_SYMBOL_GPL(ip6_push_pending_frames); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1723 | static void __ip6_flush_pending_frames(struct sock *sk, |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1724 | struct sk_buff_head *queue, |
| 1725 | struct inet_cork_full *cork, |
| 1726 | struct inet6_cork *v6_cork) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | struct sk_buff *skb; |
| 1729 | |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1730 | while ((skb = __skb_dequeue_tail(queue)) != NULL) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1731 | if (skb_dst(skb)) |
| 1732 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | e1f52208 | 2007-09-11 11:31:43 +0200 | [diff] [blame] | 1733 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | kfree_skb(skb); |
| 1735 | } |
| 1736 | |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1737 | ip6_cork_release(cork, v6_cork); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | } |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1739 | |
| 1740 | void ip6_flush_pending_frames(struct sock *sk) |
| 1741 | { |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1742 | __ip6_flush_pending_frames(sk, &sk->sk_write_queue, |
| 1743 | &inet_sk(sk)->cork, &inet6_sk(sk)->cork); |
Vlad Yasevich | 0bbe84a | 2015-01-31 10:40:14 -0500 | [diff] [blame] | 1744 | } |
Chris Elston | a495f83 | 2012-04-29 21:48:53 +0000 | [diff] [blame] | 1745 | EXPORT_SYMBOL_GPL(ip6_flush_pending_frames); |
Vlad Yasevich | 6422398 | 2015-01-31 10:40:15 -0500 | [diff] [blame] | 1746 | |
| 1747 | struct sk_buff *ip6_make_skb(struct sock *sk, |
| 1748 | int getfrag(void *from, char *to, int offset, |
| 1749 | int len, int odd, struct sk_buff *skb), |
| 1750 | void *from, int length, int transhdrlen, |
| 1751 | int hlimit, int tclass, |
| 1752 | struct ipv6_txoptions *opt, struct flowi6 *fl6, |
| 1753 | struct rt6_info *rt, unsigned int flags, |
| 1754 | int dontfrag) |
| 1755 | { |
| 1756 | struct inet_cork_full cork; |
| 1757 | struct inet6_cork v6_cork; |
| 1758 | struct sk_buff_head queue; |
| 1759 | int exthdrlen = (opt ? opt->opt_flen : 0); |
| 1760 | int err; |
| 1761 | |
| 1762 | if (flags & MSG_PROBE) |
| 1763 | return NULL; |
| 1764 | |
| 1765 | __skb_queue_head_init(&queue); |
| 1766 | |
| 1767 | cork.base.flags = 0; |
| 1768 | cork.base.addr = 0; |
| 1769 | cork.base.opt = NULL; |
| 1770 | v6_cork.opt = NULL; |
| 1771 | err = ip6_setup_cork(sk, &cork, &v6_cork, hlimit, tclass, opt, rt, fl6); |
| 1772 | if (err) |
| 1773 | return ERR_PTR(err); |
| 1774 | |
| 1775 | if (dontfrag < 0) |
| 1776 | dontfrag = inet6_sk(sk)->dontfrag; |
| 1777 | |
| 1778 | err = __ip6_append_data(sk, fl6, &queue, &cork.base, &v6_cork, |
| 1779 | ¤t->task_frag, getfrag, from, |
| 1780 | length + exthdrlen, transhdrlen + exthdrlen, |
| 1781 | flags, dontfrag); |
| 1782 | if (err) { |
| 1783 | __ip6_flush_pending_frames(sk, &queue, &cork, &v6_cork); |
| 1784 | return ERR_PTR(err); |
| 1785 | } |
| 1786 | |
| 1787 | return __ip6_make_skb(sk, &queue, &cork, &v6_cork); |
| 1788 | } |