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> |
| 23 | * Imran Patel : frag id should be in NBO |
| 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
David Stevens | ad0081e | 2010-12-17 11:42:42 +0000 | [diff] [blame] | 59 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 61 | int __ip6_local_out(struct sk_buff *skb) |
| 62 | { |
| 63 | int len; |
| 64 | |
| 65 | len = skb->len - sizeof(struct ipv6hdr); |
| 66 | if (len > IPV6_MAXPLEN) |
| 67 | len = 0; |
| 68 | ipv6_hdr(skb)->payload_len = htons(len); |
| 69 | |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 70 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
| 71 | skb_dst(skb)->dev, dst_output); |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | int ip6_local_out(struct sk_buff *skb) |
| 75 | { |
| 76 | int err; |
| 77 | |
| 78 | err = __ip6_local_out(skb); |
| 79 | if (likely(err == 1)) |
| 80 | err = dst_output(skb); |
| 81 | |
| 82 | return err; |
| 83 | } |
| 84 | EXPORT_SYMBOL_GPL(ip6_local_out); |
| 85 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | /* dev_loopback_xmit for use with netfilter. */ |
| 87 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) |
| 88 | { |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 89 | skb_reset_mac_header(newskb); |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 90 | __skb_pull(newskb, skb_network_offset(newskb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | newskb->pkt_type = PACKET_LOOPBACK; |
| 92 | newskb->ip_summed = CHECKSUM_UNNECESSARY; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 93 | WARN_ON(!skb_dst(newskb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Eric Dumazet | e30b38c | 2010-04-15 09:13:03 +0000 | [diff] [blame] | 95 | netif_rx_ni(newskb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | return 0; |
| 97 | } |
| 98 | |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 99 | static int ip6_finish_output2(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 101 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | struct net_device *dev = dst->dev; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 103 | struct neighbour *neigh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
| 105 | skb->protocol = htons(ETH_P_IPV6); |
| 106 | skb->dev = dev; |
| 107 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 108 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 109 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Octavian Purdila | 7ad6848 | 2010-01-06 20:37:01 -0800 | [diff] [blame] | 111 | if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) && |
Patrick McHardy | d1db275 | 2010-05-11 14:40:55 +0200 | [diff] [blame] | 112 | ((mroute6_socket(dev_net(dev), skb) && |
Benjamin Thery | bd91b8b | 2008-12-10 16:07:08 -0800 | [diff] [blame] | 113 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 114 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
| 115 | &ipv6_hdr(skb)->saddr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
| 117 | |
| 118 | /* Do not check for IFF_ALLMULTI; multicast routing |
| 119 | is not supported in any case. |
| 120 | */ |
| 121 | if (newskb) |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 122 | NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
| 123 | newskb, NULL, newskb->dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | ip6_dev_loopback_xmit); |
| 125 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 126 | if (ipv6_hdr(skb)->hop_limit == 0) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 127 | IP6_INC_STATS(dev_net(dev), idev, |
| 128 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | kfree_skb(skb); |
| 130 | return 0; |
| 131 | } |
| 132 | } |
| 133 | |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 134 | IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, |
| 135 | skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | |
Eric Dumazet | f2c31e3 | 2011-07-29 19:00:53 +0000 | [diff] [blame] | 138 | rcu_read_lock(); |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 139 | neigh = dst_get_neighbour(dst); |
Eric Dumazet | f2c31e3 | 2011-07-29 19:00:53 +0000 | [diff] [blame] | 140 | if (neigh) { |
| 141 | int res = neigh_output(neigh, skb); |
David S. Miller | 05e3aa0 | 2011-07-16 17:26:00 -0700 | [diff] [blame] | 142 | |
Eric Dumazet | f2c31e3 | 2011-07-29 19:00:53 +0000 | [diff] [blame] | 143 | rcu_read_unlock(); |
| 144 | return res; |
| 145 | } |
| 146 | rcu_read_unlock(); |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 147 | IP6_INC_STATS_BH(dev_net(dst->dev), |
| 148 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
| 149 | kfree_skb(skb); |
| 150 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 153 | static int ip6_finish_output(struct sk_buff *skb) |
| 154 | { |
| 155 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || |
| 156 | dst_allfrag(skb_dst(skb))) |
| 157 | return ip6_fragment(skb, ip6_finish_output2); |
| 158 | else |
| 159 | return ip6_finish_output2(skb); |
| 160 | } |
| 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | int ip6_output(struct sk_buff *skb) |
| 163 | { |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 164 | struct net_device *dev = skb_dst(skb)->dev; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 165 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 166 | if (unlikely(idev->cnf.disable_ipv6)) { |
Jan Engelhardt | 9e50849 | 2010-04-13 15:28:11 +0200 | [diff] [blame] | 167 | IP6_INC_STATS(dev_net(dev), idev, |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 168 | IPSTATS_MIB_OUTDISCARDS); |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 169 | kfree_skb(skb); |
| 170 | return 0; |
| 171 | } |
| 172 | |
Jan Engelhardt | 9c6eb28 | 2010-04-13 15:32:16 +0200 | [diff] [blame] | 173 | return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL, dev, |
| 174 | ip6_finish_output, |
| 175 | !(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | /* |
Shan Wei | b5d4399 | 2010-04-15 16:48:48 +0000 | [diff] [blame] | 179 | * xmit an sk_buff (used by TCP, SCTP and DCCP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | */ |
| 181 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 182 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6, |
Shan Wei | 4e15ed4 | 2010-04-15 16:43:08 +0000 | [diff] [blame] | 183 | struct ipv6_txoptions *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 185 | struct net *net = sock_net(sk); |
Patrick McHardy | b30bd28 | 2006-03-23 01:17:25 -0800 | [diff] [blame] | 186 | struct ipv6_pinfo *np = inet6_sk(sk); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 187 | struct in6_addr *first_hop = &fl6->daddr; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 188 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | struct ipv6hdr *hdr; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 190 | u8 proto = fl6->flowi6_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | int seg_len = skb->len; |
Gerrit Renker | e651f03 | 2009-08-09 08:12:48 +0000 | [diff] [blame] | 192 | int hlimit = -1; |
| 193 | int tclass = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | u32 mtu; |
| 195 | |
| 196 | if (opt) { |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 197 | unsigned int head_room; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
| 199 | /* First: exthdrs may take lots of space (~8K for now) |
| 200 | MAX_HEADER is not enough. |
| 201 | */ |
| 202 | head_room = opt->opt_nflen + opt->opt_flen; |
| 203 | seg_len += head_room; |
| 204 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); |
| 205 | |
| 206 | if (skb_headroom(skb) < head_room) { |
| 207 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 208 | if (skb2 == NULL) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 209 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 210 | IPSTATS_MIB_OUTDISCARDS); |
| 211 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | return -ENOBUFS; |
| 213 | } |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 214 | kfree_skb(skb); |
| 215 | skb = skb2; |
Dan Carpenter | 83d7eb2 | 2010-04-30 16:42:08 -0700 | [diff] [blame] | 216 | skb_set_owner_w(skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | if (opt->opt_flen) |
| 219 | ipv6_push_frag_opts(skb, opt, &proto); |
| 220 | if (opt->opt_nflen) |
| 221 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); |
| 222 | } |
| 223 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 224 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 225 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 226 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | /* |
| 229 | * Fill in the IPv6 header |
| 230 | */ |
Gerrit Renker | e651f03 | 2009-08-09 08:12:48 +0000 | [diff] [blame] | 231 | if (np) { |
| 232 | tclass = np->tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | hlimit = np->hop_limit; |
Gerrit Renker | e651f03 | 2009-08-09 08:12:48 +0000 | [diff] [blame] | 234 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 236 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 238 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl6->flowlabel; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 239 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | hdr->payload_len = htons(seg_len); |
| 241 | hdr->nexthdr = proto; |
| 242 | hdr->hop_limit = hlimit; |
| 243 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 244 | ipv6_addr_copy(&hdr->saddr, &fl6->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | ipv6_addr_copy(&hdr->daddr, first_hop); |
| 246 | |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 247 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 248 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | mtu = dst_mtu(dst); |
Wei Yongjun | 283d07ac | 2008-08-03 21:15:59 -0700 | [diff] [blame] | 251 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 252 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 253 | IPSTATS_MIB_OUT, skb->len); |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 254 | return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, |
| 255 | dst->dev, dst_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | if (net_ratelimit()) |
| 259 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); |
| 260 | skb->dev = dst->dev; |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 261 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 262 | 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] | 263 | kfree_skb(skb); |
| 264 | return -EMSGSIZE; |
| 265 | } |
| 266 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 267 | EXPORT_SYMBOL(ip6_xmit); |
| 268 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | /* |
| 270 | * To avoid extra problems ND packets are send through this |
| 271 | * routine. It's code duplication but I really want to avoid |
| 272 | * extra checks since ipv6_build_header is used by TCP (which |
| 273 | * is for us performance critical) |
| 274 | */ |
| 275 | |
| 276 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, |
YOSHIFUJI Hideaki | 9acd9f3 | 2008-04-10 15:42:10 +0900 | [diff] [blame] | 277 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | int proto, int len) |
| 279 | { |
| 280 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 281 | struct ipv6hdr *hdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
| 283 | skb->protocol = htons(ETH_P_IPV6); |
| 284 | skb->dev = dev; |
| 285 | |
Arnaldo Carvalho de Melo | 55f79cc | 2007-03-14 21:05:03 -0300 | [diff] [blame] | 286 | skb_reset_network_header(skb); |
| 287 | skb_put(skb, sizeof(struct ipv6hdr)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 288 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
Al Viro | ae08e1f | 2006-11-08 00:27:11 -0800 | [diff] [blame] | 290 | *(__be32*)hdr = htonl(0x60000000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | hdr->payload_len = htons(len); |
| 293 | hdr->nexthdr = proto; |
| 294 | hdr->hop_limit = np->hop_limit; |
| 295 | |
| 296 | ipv6_addr_copy(&hdr->saddr, saddr); |
| 297 | ipv6_addr_copy(&hdr->daddr, daddr); |
| 298 | |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
| 303 | { |
| 304 | struct ip6_ra_chain *ra; |
| 305 | struct sock *last = NULL; |
| 306 | |
| 307 | read_lock(&ip6_ra_lock); |
| 308 | for (ra = ip6_ra_chain; ra; ra = ra->next) { |
| 309 | struct sock *sk = ra->sk; |
Andrew McDonald | 0bd1b59 | 2005-08-09 19:44:42 -0700 | [diff] [blame] | 310 | if (sk && ra->sel == sel && |
| 311 | (!sk->sk_bound_dev_if || |
| 312 | sk->sk_bound_dev_if == skb->dev->ifindex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | if (last) { |
| 314 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 315 | if (skb2) |
| 316 | rawv6_rcv(last, skb2); |
| 317 | } |
| 318 | last = sk; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | if (last) { |
| 323 | rawv6_rcv(last, skb); |
| 324 | read_unlock(&ip6_ra_lock); |
| 325 | return 1; |
| 326 | } |
| 327 | read_unlock(&ip6_ra_lock); |
| 328 | return 0; |
| 329 | } |
| 330 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 331 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
| 332 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 333 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 334 | u8 nexthdr = hdr->nexthdr; |
| 335 | int offset; |
| 336 | |
| 337 | if (ipv6_ext_hdr(nexthdr)) { |
| 338 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); |
| 339 | if (offset < 0) |
| 340 | return 0; |
| 341 | } else |
| 342 | offset = sizeof(struct ipv6hdr); |
| 343 | |
| 344 | if (nexthdr == IPPROTO_ICMPV6) { |
| 345 | struct icmp6hdr *icmp6; |
| 346 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 347 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
| 348 | offset + 1 - skb->data))) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 349 | return 0; |
| 350 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 351 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 352 | |
| 353 | switch (icmp6->icmp6_type) { |
| 354 | case NDISC_ROUTER_SOLICITATION: |
| 355 | case NDISC_ROUTER_ADVERTISEMENT: |
| 356 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 357 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 358 | case NDISC_REDIRECT: |
| 359 | /* For reaction involving unicast neighbor discovery |
| 360 | * message destined to the proxied address, pass it to |
| 361 | * input function. |
| 362 | */ |
| 363 | return 1; |
| 364 | default: |
| 365 | break; |
| 366 | } |
| 367 | } |
| 368 | |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 369 | /* |
| 370 | * The proxying router can't forward traffic sent to a link-local |
| 371 | * address, so signal the sender and discard the packet. This |
| 372 | * behavior is clarified by the MIPv6 specification. |
| 373 | */ |
| 374 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { |
| 375 | dst_link_failure(skb); |
| 376 | return -1; |
| 377 | } |
| 378 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 379 | return 0; |
| 380 | } |
| 381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | static inline int ip6_forward_finish(struct sk_buff *skb) |
| 383 | { |
| 384 | return dst_output(skb); |
| 385 | } |
| 386 | |
| 387 | int ip6_forward(struct sk_buff *skb) |
| 388 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 389 | struct dst_entry *dst = skb_dst(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 390 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | struct inet6_skb_parm *opt = IP6CB(skb); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 392 | struct net *net = dev_net(dst->dev); |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 393 | struct neighbour *n; |
Ulrich Weber | 14f3ad6 | 2010-02-26 04:34:49 -0800 | [diff] [blame] | 394 | u32 mtu; |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 395 | |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 396 | if (net->ipv6.devconf_all->forwarding == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | goto error; |
| 398 | |
Ben Hutchings | 4497b07 | 2008-06-19 16:22:28 -0700 | [diff] [blame] | 399 | if (skb_warn_if_lro(skb)) |
| 400 | goto drop; |
| 401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 403 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | goto drop; |
| 405 | } |
| 406 | |
Alexey Kuznetsov | 72b43d0 | 2011-01-12 08:34:08 +0000 | [diff] [blame] | 407 | if (skb->pkt_type != PACKET_HOST) |
| 408 | goto drop; |
| 409 | |
Herbert Xu | 35fc92a | 2007-03-26 23:22:20 -0700 | [diff] [blame] | 410 | skb_forward_csum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | /* |
| 413 | * We DO NOT make any processing on |
| 414 | * RA packets, pushing them to user level AS IS |
| 415 | * without ane WARRANTY that application will be able |
| 416 | * to interpret them. The reason is that we |
| 417 | * cannot make anything clever here. |
| 418 | * |
| 419 | * We are not end-node, so that if packet contains |
| 420 | * AH/ESP, we cannot make anything. |
| 421 | * Defragmentation also would be mistake, RA packets |
| 422 | * cannot be fragmented, because there is no warranty |
| 423 | * that different fragments will go along one path. --ANK |
| 424 | */ |
| 425 | if (opt->ra) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 426 | u8 *ptr = skb_network_header(skb) + opt->ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
| 428 | return 0; |
| 429 | } |
| 430 | |
| 431 | /* |
| 432 | * check and decrement ttl |
| 433 | */ |
| 434 | if (hdr->hop_limit <= 1) { |
| 435 | /* Force OUTPUT device used as source address */ |
| 436 | skb->dev = dst->dev; |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 437 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 0); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 438 | IP6_INC_STATS_BH(net, |
| 439 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | |
| 441 | kfree_skb(skb); |
| 442 | return -ETIMEDOUT; |
| 443 | } |
| 444 | |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 445 | /* XXX: idev->cnf.proxy_ndp? */ |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 446 | if (net->ipv6.devconf_all->proxy_ndp && |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 447 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 448 | int proxied = ip6_forward_proxy_check(skb); |
| 449 | if (proxied > 0) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 450 | return ip6_input(skb); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 451 | else if (proxied < 0) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 452 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
| 453 | IPSTATS_MIB_INDISCARDS); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 454 | goto drop; |
| 455 | } |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 456 | } |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | if (!xfrm6_route_forward(skb)) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 459 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | goto drop; |
| 461 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 462 | dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
| 464 | /* IPv6 specs say nothing about it, but it is clear that we cannot |
| 465 | send redirects to source routed frames. |
Masahide NAKAMURA | 1e5dc14 | 2007-08-24 19:08:55 +0900 | [diff] [blame] | 466 | We don't send redirects to frames decapsulated from IPsec. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | */ |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 468 | n = dst_get_neighbour(dst); |
| 469 | if (skb->dev == dst->dev && n && opt->srcrt == 0 && !skb_sec_path(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | struct in6_addr *target = NULL; |
| 471 | struct rt6_info *rt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | |
| 473 | /* |
| 474 | * incoming and outgoing devices are the same |
| 475 | * send a redirect. |
| 476 | */ |
| 477 | |
| 478 | rt = (struct rt6_info *) dst; |
| 479 | if ((rt->rt6i_flags & RTF_GATEWAY)) |
| 480 | target = (struct in6_addr*)&n->primary_key; |
| 481 | else |
| 482 | target = &hdr->daddr; |
| 483 | |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 484 | if (!rt->rt6i_peer) |
| 485 | rt6_bind_peer(rt, 1); |
| 486 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | /* Limit redirects both by destination (here) |
| 488 | and by source (inside ndisc_send_redirect) |
| 489 | */ |
David S. Miller | 92d8682 | 2011-02-04 15:55:25 -0800 | [diff] [blame] | 490 | if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | ndisc_send_redirect(skb, n, target); |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 492 | } else { |
| 493 | int addrtype = ipv6_addr_type(&hdr->saddr); |
| 494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | /* This check is security critical. */ |
YOSHIFUJI Hideaki | f81b2e7 | 2008-06-25 16:55:26 +0900 | [diff] [blame] | 496 | if (addrtype == IPV6_ADDR_ANY || |
| 497 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 498 | goto error; |
| 499 | if (addrtype & IPV6_ADDR_LINKLOCAL) { |
| 500 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 501 | ICMPV6_NOT_NEIGHBOUR, 0); |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 502 | goto error; |
| 503 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | } |
| 505 | |
Ulrich Weber | 14f3ad6 | 2010-02-26 04:34:49 -0800 | [diff] [blame] | 506 | mtu = dst_mtu(dst); |
| 507 | if (mtu < IPV6_MIN_MTU) |
| 508 | mtu = IPV6_MIN_MTU; |
| 509 | |
Herbert Xu | 0aa6827 | 2010-05-27 16:14:30 -0700 | [diff] [blame] | 510 | if (skb->len > mtu && !skb_is_gso(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* Again, force OUTPUT device used as source address */ |
| 512 | skb->dev = dst->dev; |
Ulrich Weber | 14f3ad6 | 2010-02-26 04:34:49 -0800 | [diff] [blame] | 513 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 514 | IP6_INC_STATS_BH(net, |
| 515 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); |
| 516 | IP6_INC_STATS_BH(net, |
| 517 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | kfree_skb(skb); |
| 519 | return -EMSGSIZE; |
| 520 | } |
| 521 | |
| 522 | if (skb_cow(skb, dst->dev->hard_header_len)) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 523 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | goto drop; |
| 525 | } |
| 526 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 527 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
| 529 | /* Mangling hops number delayed to point after skb COW */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | hdr->hop_limit--; |
| 532 | |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 533 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
Jan Engelhardt | b2e0b38 | 2010-03-23 04:09:07 +0100 | [diff] [blame] | 534 | return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 535 | ip6_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | |
| 537 | error: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 538 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | drop: |
| 540 | kfree_skb(skb); |
| 541 | return -EINVAL; |
| 542 | } |
| 543 | |
| 544 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) |
| 545 | { |
| 546 | to->pkt_type = from->pkt_type; |
| 547 | to->priority = from->priority; |
| 548 | to->protocol = from->protocol; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 549 | skb_dst_drop(to); |
| 550 | skb_dst_set(to, dst_clone(skb_dst(from))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | to->dev = from->dev; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 552 | to->mark = from->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | |
| 554 | #ifdef CONFIG_NET_SCHED |
| 555 | to->tc_index = from->tc_index; |
| 556 | #endif |
Yasuyuki Kozakai | e7ac05f | 2007-03-14 16:44:01 -0700 | [diff] [blame] | 557 | nf_copy(to, from); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 558 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 559 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
| 560 | to->nf_trace = from->nf_trace; |
| 561 | #endif |
James Morris | 984bc16 | 2006-06-09 00:29:17 -0700 | [diff] [blame] | 562 | skb_copy_secmark(to, from); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
| 566 | { |
| 567 | u16 offset = sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 568 | struct ipv6_opt_hdr *exthdr = |
| 569 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 570 | unsigned int packet_len = skb->tail - skb->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | int found_rhdr = 0; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 572 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | while (offset + 1 <= packet_len) { |
| 575 | |
| 576 | switch (**nexthdr) { |
| 577 | |
| 578 | case NEXTHDR_HOP: |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 579 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | case NEXTHDR_ROUTING: |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 581 | found_rhdr = 1; |
| 582 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | case NEXTHDR_DEST: |
Masahide NAKAMURA | 59fbb3a6 | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 584 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 585 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
| 586 | break; |
| 587 | #endif |
| 588 | if (found_rhdr) |
| 589 | return offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | break; |
| 591 | default : |
| 592 | return offset; |
| 593 | } |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 594 | |
| 595 | offset += ipv6_optlen(exthdr); |
| 596 | *nexthdr = &exthdr->nexthdr; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 597 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
| 598 | offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
| 600 | |
| 601 | return offset; |
| 602 | } |
| 603 | |
Eric Dumazet | 87c48fa | 2011-07-21 21:25:58 -0700 | [diff] [blame] | 604 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) |
| 605 | { |
| 606 | static atomic_t ipv6_fragmentation_id; |
| 607 | int old, new; |
| 608 | |
| 609 | if (rt) { |
| 610 | struct inet_peer *peer; |
| 611 | |
| 612 | if (!rt->rt6i_peer) |
| 613 | rt6_bind_peer(rt, 1); |
| 614 | peer = rt->rt6i_peer; |
| 615 | if (peer) { |
| 616 | fhdr->identification = htonl(inet_getid(peer, 0)); |
| 617 | return; |
| 618 | } |
| 619 | } |
| 620 | do { |
| 621 | old = atomic_read(&ipv6_fragmentation_id); |
| 622 | new = old + 1; |
| 623 | if (!new) |
| 624 | new = 1; |
| 625 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); |
| 626 | fhdr->identification = htonl(new); |
| 627 | } |
| 628 | |
David Stevens | ad0081e | 2010-12-17 11:42:42 +0000 | [diff] [blame] | 629 | int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | struct sk_buff *frag; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 632 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 633 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | struct ipv6hdr *tmp_hdr; |
| 635 | struct frag_hdr *fh; |
| 636 | unsigned int mtu, hlen, left, len; |
Al Viro | ae08e1f | 2006-11-08 00:27:11 -0800 | [diff] [blame] | 637 | __be32 frag_id = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | int ptr, offset = 0, err=0; |
| 639 | u8 *prevhdr, nexthdr = 0; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 640 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
| 643 | nexthdr = *prevhdr; |
| 644 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 645 | mtu = ip6_skb_dst_mtu(skb); |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 646 | |
| 647 | /* 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] | 648 | * or if the skb it not generated by a local socket. |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 649 | */ |
Shan Wei | f2228f7 | 2010-04-18 16:58:22 +0000 | [diff] [blame] | 650 | if (!skb->local_df && skb->len > mtu) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 651 | skb->dev = skb_dst(skb)->dev; |
Alexey Dobriyan | 3ffe533 | 2010-02-18 08:25:24 +0000 | [diff] [blame] | 652 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 653 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 654 | IPSTATS_MIB_FRAGFAILS); |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 655 | kfree_skb(skb); |
| 656 | return -EMSGSIZE; |
| 657 | } |
| 658 | |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 659 | if (np && np->frag_size < mtu) { |
| 660 | if (np->frag_size) |
| 661 | mtu = np->frag_size; |
| 662 | } |
| 663 | mtu -= hlen + sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
David S. Miller | 21dc330 | 2010-08-23 00:13:46 -0700 | [diff] [blame] | 665 | if (skb_has_frag_list(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | int first_len = skb_pagelen(skb); |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 667 | struct sk_buff *frag2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
| 669 | if (first_len - hlen > mtu || |
| 670 | ((first_len - hlen) & 7) || |
| 671 | skb_cloned(skb)) |
| 672 | goto slow_path; |
| 673 | |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 674 | skb_walk_frags(skb, frag) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | /* Correct geometry. */ |
| 676 | if (frag->len > mtu || |
| 677 | ((frag->len & 7) && frag->next) || |
| 678 | skb_headroom(frag) < hlen) |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 679 | goto slow_path_clean; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | /* Partially cloned skb? */ |
| 682 | if (skb_shared(frag)) |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 683 | goto slow_path_clean; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 684 | |
| 685 | BUG_ON(frag->sk); |
| 686 | if (skb->sk) { |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 687 | frag->sk = skb->sk; |
| 688 | frag->destructor = sock_wfree; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 689 | } |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 690 | skb->truesize -= frag->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | err = 0; |
| 694 | offset = 0; |
| 695 | frag = skb_shinfo(skb)->frag_list; |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 696 | skb_frag_list_init(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | /* BUILD HEADER */ |
| 698 | |
YOSHIFUJI Hideaki | 9a217a1 | 2006-12-05 13:47:21 -0800 | [diff] [blame] | 699 | *prevhdr = NEXTHDR_FRAGMENT; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 700 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | if (!tmp_hdr) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 702 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 703 | IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | return -ENOMEM; |
| 705 | } |
| 706 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | __skb_pull(skb, hlen); |
| 708 | 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] | 709 | __skb_push(skb, hlen); |
| 710 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 711 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Eric Dumazet | 87c48fa | 2011-07-21 21:25:58 -0700 | [diff] [blame] | 713 | ipv6_select_ident(fh, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | fh->nexthdr = nexthdr; |
| 715 | fh->reserved = 0; |
| 716 | fh->frag_off = htons(IP6_MF); |
| 717 | frag_id = fh->identification; |
| 718 | |
| 719 | first_len = skb_pagelen(skb); |
| 720 | skb->data_len = first_len - skb_headlen(skb); |
| 721 | skb->len = first_len; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 722 | ipv6_hdr(skb)->payload_len = htons(first_len - |
| 723 | sizeof(struct ipv6hdr)); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 724 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 725 | dst_hold(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | for (;;) { |
| 728 | /* Prepare header of the next frame, |
| 729 | * before previous one went down. */ |
| 730 | if (frag) { |
| 731 | frag->ip_summed = CHECKSUM_NONE; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 732 | skb_reset_transport_header(frag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | 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] | 734 | __skb_push(frag, hlen); |
| 735 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 736 | memcpy(skb_network_header(frag), tmp_hdr, |
| 737 | hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
| 739 | fh->nexthdr = nexthdr; |
| 740 | fh->reserved = 0; |
| 741 | fh->frag_off = htons(offset); |
| 742 | if (frag->next != NULL) |
| 743 | fh->frag_off |= htons(IP6_MF); |
| 744 | fh->identification = frag_id; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 745 | ipv6_hdr(frag)->payload_len = |
| 746 | htons(frag->len - |
| 747 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | ip6_copy_metadata(frag, skb); |
| 749 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | err = output(skb); |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 752 | if(!err) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 753 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 754 | IPSTATS_MIB_FRAGCREATES); |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | if (err || !frag) |
| 757 | break; |
| 758 | |
| 759 | skb = frag; |
| 760 | frag = skb->next; |
| 761 | skb->next = NULL; |
| 762 | } |
| 763 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 764 | kfree(tmp_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | |
| 766 | if (err == 0) { |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 767 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 768 | IPSTATS_MIB_FRAGOKS); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 769 | dst_release(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | return 0; |
| 771 | } |
| 772 | |
| 773 | while (frag) { |
| 774 | skb = frag->next; |
| 775 | kfree_skb(frag); |
| 776 | frag = skb; |
| 777 | } |
| 778 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 779 | IP6_INC_STATS(net, ip6_dst_idev(&rt->dst), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 780 | IPSTATS_MIB_FRAGFAILS); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 781 | dst_release(&rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | return err; |
Eric Dumazet | 3d13008 | 2010-09-21 08:47:45 +0000 | [diff] [blame] | 783 | |
| 784 | slow_path_clean: |
| 785 | skb_walk_frags(skb, frag2) { |
| 786 | if (frag2 == frag) |
| 787 | break; |
| 788 | frag2->sk = NULL; |
| 789 | frag2->destructor = NULL; |
| 790 | skb->truesize += frag2->truesize; |
| 791 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
| 793 | |
| 794 | slow_path: |
| 795 | left = skb->len - hlen; /* Space per frame */ |
| 796 | ptr = hlen; /* Where to start from */ |
| 797 | |
| 798 | /* |
| 799 | * Fragment the datagram. |
| 800 | */ |
| 801 | |
| 802 | *prevhdr = NEXTHDR_FRAGMENT; |
| 803 | |
| 804 | /* |
| 805 | * Keep copying data until we run out. |
| 806 | */ |
| 807 | while(left > 0) { |
| 808 | len = left; |
| 809 | /* IF: it doesn't fit, use 'mtu' - the data space left */ |
| 810 | if (len > mtu) |
| 811 | len = mtu; |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 812 | /* IF: we are not sending up to and including the packet end |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | then align the next start on an eight byte boundary */ |
| 814 | if (len < left) { |
| 815 | len &= ~7; |
| 816 | } |
| 817 | /* |
| 818 | * Allocate buffer. |
| 819 | */ |
| 820 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 821 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->dst.dev), GFP_ATOMIC)) == NULL) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 822 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 823 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 824 | IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | err = -ENOMEM; |
| 826 | goto fail; |
| 827 | } |
| 828 | |
| 829 | /* |
| 830 | * Set up data on packet |
| 831 | */ |
| 832 | |
| 833 | ip6_copy_metadata(frag, skb); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 834 | skb_reserve(frag, LL_RESERVED_SPACE(rt->dst.dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 836 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 837 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 838 | frag->transport_header = (frag->network_header + hlen + |
| 839 | sizeof(struct frag_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
| 841 | /* |
| 842 | * Charge the memory for the fragment to any owner |
| 843 | * it might possess |
| 844 | */ |
| 845 | if (skb->sk) |
| 846 | skb_set_owner_w(frag, skb->sk); |
| 847 | |
| 848 | /* |
| 849 | * Copy the packet header into the new buffer. |
| 850 | */ |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 851 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | |
| 853 | /* |
| 854 | * Build fragment header. |
| 855 | */ |
| 856 | fh->nexthdr = nexthdr; |
| 857 | fh->reserved = 0; |
Yan Zheng | f36d6ab | 2005-10-03 14:19:15 -0700 | [diff] [blame] | 858 | if (!frag_id) { |
Eric Dumazet | 87c48fa | 2011-07-21 21:25:58 -0700 | [diff] [blame] | 859 | ipv6_select_ident(fh, rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | frag_id = fh->identification; |
| 861 | } else |
| 862 | fh->identification = frag_id; |
| 863 | |
| 864 | /* |
| 865 | * Copy a block of the IP datagram. |
| 866 | */ |
Wei Yongjun | 8984e41 | 2007-08-21 20:59:08 -0700 | [diff] [blame] | 867 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | BUG(); |
| 869 | left -= len; |
| 870 | |
| 871 | fh->frag_off = htons(offset); |
| 872 | if (left > 0) |
| 873 | fh->frag_off |= htons(IP6_MF); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 874 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
| 875 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | |
| 877 | ptr += len; |
| 878 | offset += len; |
| 879 | |
| 880 | /* |
| 881 | * Put this fragment into the sending queue. |
| 882 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | err = output(frag); |
| 884 | if (err) |
| 885 | goto fail; |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 886 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 887 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 888 | IPSTATS_MIB_FRAGCREATES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 890 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 891 | IPSTATS_MIB_FRAGOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | return err; |
| 894 | |
| 895 | fail: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 896 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 897 | IPSTATS_MIB_FRAGFAILS); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 898 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | return err; |
| 900 | } |
| 901 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 902 | static inline int ip6_rt_check(const struct rt6key *rt_key, |
| 903 | const struct in6_addr *fl_addr, |
| 904 | const struct in6_addr *addr_cache) |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 905 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 906 | return (rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
| 907 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)); |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 908 | } |
| 909 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 910 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
| 911 | struct dst_entry *dst, |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 912 | const struct flowi6 *fl6) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 914 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 915 | struct rt6_info *rt = (struct rt6_info *)dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 917 | if (!dst) |
| 918 | goto out; |
| 919 | |
| 920 | /* Yes, checking route validity in not connected |
| 921 | * case is not very simple. Take into account, |
| 922 | * that we do not support routing by source, TOS, |
| 923 | * and MSG_DONTROUTE --ANK (980726) |
| 924 | * |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 925 | * 1. ip6_rt_check(): If route was host route, |
| 926 | * check that cached destination is current. |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 927 | * If it is network route, we still may |
| 928 | * check its validity using saved pointer |
| 929 | * to the last used address: daddr_cache. |
| 930 | * We do not want to save whole address now, |
| 931 | * (because main consumer of this service |
| 932 | * is tcp, which has not this problem), |
| 933 | * so that the last trick works only on connected |
| 934 | * sockets. |
| 935 | * 2. oif also should be the same. |
| 936 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 937 | if (ip6_rt_check(&rt->rt6i_dst, &fl6->daddr, np->daddr_cache) || |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 938 | #ifdef CONFIG_IPV6_SUBTREES |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 939 | ip6_rt_check(&rt->rt6i_src, &fl6->saddr, np->saddr_cache) || |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 940 | #endif |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 941 | (fl6->flowi6_oif && fl6->flowi6_oif != dst->dev->ifindex)) { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 942 | dst_release(dst); |
| 943 | dst = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | } |
| 945 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 946 | out: |
| 947 | return dst; |
| 948 | } |
| 949 | |
| 950 | static int ip6_dst_lookup_tail(struct sock *sk, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 951 | struct dst_entry **dst, struct flowi6 *fl6) |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 952 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 953 | struct net *net = sock_net(sk); |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 954 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| 955 | struct neighbour *n; |
| 956 | #endif |
| 957 | int err; |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | if (*dst == NULL) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 960 | *dst = ip6_route_output(net, sk, fl6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
| 962 | if ((err = (*dst)->error)) |
| 963 | goto out_err_release; |
| 964 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 965 | if (ipv6_addr_any(&fl6->saddr)) { |
Daniel Walter | c3968a8 | 2011-04-13 21:10:57 +0000 | [diff] [blame] | 966 | struct rt6_info *rt = (struct rt6_info *) *dst; |
| 967 | err = ip6_route_get_saddr(net, rt, &fl6->daddr, |
| 968 | sk ? inet6_sk(sk)->srcprefs : 0, |
| 969 | &fl6->saddr); |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 970 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | goto out_err_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 974 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 975 | /* |
| 976 | * Here if the dst entry we've looked up |
| 977 | * has a neighbour entry that is in the INCOMPLETE |
| 978 | * state and the src address from the flow is |
| 979 | * marked as OPTIMISTIC, we release the found |
| 980 | * dst entry and replace it instead with the |
| 981 | * dst entry of the nexthop router |
| 982 | */ |
Eric Dumazet | f2c31e3 | 2011-07-29 19:00:53 +0000 | [diff] [blame] | 983 | rcu_read_lock(); |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 984 | n = dst_get_neighbour(*dst); |
| 985 | if (n && !(n->nud_state & NUD_VALID)) { |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 986 | struct inet6_ifaddr *ifp; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 987 | struct flowi6 fl_gw6; |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 988 | int redirect; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 989 | |
Eric Dumazet | f2c31e3 | 2011-07-29 19:00:53 +0000 | [diff] [blame] | 990 | rcu_read_unlock(); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 991 | ifp = ipv6_get_ifaddr(net, &fl6->saddr, |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 992 | (*dst)->dev, 1); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 993 | |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 994 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); |
| 995 | if (ifp) |
| 996 | in6_ifa_put(ifp); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 997 | |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 998 | if (redirect) { |
| 999 | /* |
| 1000 | * We need to get the dst entry for the |
| 1001 | * default router instead |
| 1002 | */ |
| 1003 | dst_release(*dst); |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1004 | memcpy(&fl_gw6, fl6, sizeof(struct flowi6)); |
| 1005 | memset(&fl_gw6.daddr, 0, sizeof(struct in6_addr)); |
| 1006 | *dst = ip6_route_output(net, sk, &fl_gw6); |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 1007 | if ((err = (*dst)->error)) |
| 1008 | goto out_err_release; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 1009 | } |
Eric Dumazet | f2c31e3 | 2011-07-29 19:00:53 +0000 | [diff] [blame] | 1010 | } else { |
| 1011 | rcu_read_unlock(); |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 1012 | } |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 1013 | #endif |
| 1014 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | return 0; |
| 1016 | |
| 1017 | out_err_release: |
Mitsuru Chinen | ca46f9c | 2007-12-05 22:31:47 -0800 | [diff] [blame] | 1018 | if (err == -ENETUNREACH) |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 1019 | IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1020 | dst_release(*dst); |
| 1021 | *dst = NULL; |
| 1022 | return err; |
| 1023 | } |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 1024 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1025 | /** |
| 1026 | * ip6_dst_lookup - perform route lookup on flow |
| 1027 | * @sk: socket which provides route info |
| 1028 | * @dst: pointer to dst_entry * for result |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1029 | * @fl6: flow to lookup |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1030 | * |
| 1031 | * This function performs a route lookup on the given flow. |
| 1032 | * |
| 1033 | * It returns zero on success, or a standard errno code on error. |
| 1034 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1035 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi6 *fl6) |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1036 | { |
| 1037 | *dst = NULL; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1038 | return ip6_dst_lookup_tail(sk, dst, fl6); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1039 | } |
Arnaldo Carvalho de Melo | 3cf3dc6 | 2005-12-13 23:23:20 -0800 | [diff] [blame] | 1040 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
| 1041 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1042 | /** |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1043 | * ip6_dst_lookup_flow - perform route lookup on flow with ipsec |
| 1044 | * @sk: socket which provides route info |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1045 | * @fl6: flow to lookup |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1046 | * @final_dst: final destination address for ipsec lookup |
David S. Miller | a141471 | 2011-03-01 14:32:04 -0800 | [diff] [blame] | 1047 | * @can_sleep: we are in a sleepable context |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1048 | * |
| 1049 | * This function performs a route lookup on the given flow. |
| 1050 | * |
| 1051 | * It returns a valid dst pointer on success, or a pointer encoded |
| 1052 | * error code. |
| 1053 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1054 | struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1055 | const struct in6_addr *final_dst, |
David S. Miller | a141471 | 2011-03-01 14:32:04 -0800 | [diff] [blame] | 1056 | bool can_sleep) |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1057 | { |
| 1058 | struct dst_entry *dst = NULL; |
| 1059 | int err; |
| 1060 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1061 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1062 | if (err) |
| 1063 | return ERR_PTR(err); |
| 1064 | if (final_dst) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1065 | ipv6_addr_copy(&fl6->daddr, final_dst); |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 1066 | if (can_sleep) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1067 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 1068 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1069 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1070 | } |
| 1071 | EXPORT_SYMBOL_GPL(ip6_dst_lookup_flow); |
| 1072 | |
| 1073 | /** |
| 1074 | * ip6_sk_dst_lookup_flow - perform socket cached route lookup on flow |
| 1075 | * @sk: socket which provides the dst cache and route info |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1076 | * @fl6: flow to lookup |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1077 | * @final_dst: final destination address for ipsec lookup |
David S. Miller | a141471 | 2011-03-01 14:32:04 -0800 | [diff] [blame] | 1078 | * @can_sleep: we are in a sleepable context |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1079 | * |
| 1080 | * This function performs a route lookup on the given flow with the |
| 1081 | * possibility of using the cached route in the socket if it is valid. |
| 1082 | * It will take the socket dst lock when operating on the dst cache. |
| 1083 | * As a result, this function can only be used in process context. |
| 1084 | * |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1085 | * It returns a valid dst pointer on success, or a pointer encoded |
| 1086 | * error code. |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1087 | */ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1088 | struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6, |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1089 | const struct in6_addr *final_dst, |
David S. Miller | a141471 | 2011-03-01 14:32:04 -0800 | [diff] [blame] | 1090 | bool can_sleep) |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1091 | { |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1092 | struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
| 1093 | int err; |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1094 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1095 | dst = ip6_sk_dst_check(sk, dst, fl6); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1096 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1097 | err = ip6_dst_lookup_tail(sk, &dst, fl6); |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1098 | if (err) |
| 1099 | return ERR_PTR(err); |
| 1100 | if (final_dst) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1101 | ipv6_addr_copy(&fl6->daddr, final_dst); |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 1102 | if (can_sleep) |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1103 | fl6->flowi6_flags |= FLOWI_FLAG_CAN_SLEEP; |
David S. Miller | 2774c13 | 2011-03-01 14:59:04 -0800 | [diff] [blame] | 1104 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1105 | return xfrm_lookup(sock_net(sk), dst, flowi6_to_flowi(fl6), sk, 0); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1106 | } |
David S. Miller | 68d0c6d | 2011-03-01 13:19:07 -0800 | [diff] [blame] | 1107 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup_flow); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1108 | |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 1109 | static inline int ip6_ufo_append_data(struct sock *sk, |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1110 | int getfrag(void *from, char *to, int offset, int len, |
| 1111 | int odd, struct sk_buff *skb), |
| 1112 | void *from, int length, int hh_len, int fragheaderlen, |
Eric Dumazet | 87c48fa | 2011-07-21 21:25:58 -0700 | [diff] [blame] | 1113 | int transhdrlen, int mtu,unsigned int flags, |
| 1114 | struct rt6_info *rt) |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1115 | |
| 1116 | { |
| 1117 | struct sk_buff *skb; |
| 1118 | int err; |
| 1119 | |
| 1120 | /* There is support for UDP large send offload by network |
| 1121 | * device, so create one single skb packet containing complete |
| 1122 | * udp datagram |
| 1123 | */ |
| 1124 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { |
| 1125 | skb = sock_alloc_send_skb(sk, |
| 1126 | hh_len + fragheaderlen + transhdrlen + 20, |
| 1127 | (flags & MSG_DONTWAIT), &err); |
| 1128 | if (skb == NULL) |
| 1129 | return -ENOMEM; |
| 1130 | |
| 1131 | /* reserve space for Hardware header */ |
| 1132 | skb_reserve(skb, hh_len); |
| 1133 | |
| 1134 | /* create space for UDP/IP header */ |
| 1135 | skb_put(skb,fragheaderlen + transhdrlen); |
| 1136 | |
| 1137 | /* initialize network header pointer */ |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1138 | skb_reset_network_header(skb); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1139 | |
| 1140 | /* initialize protocol header pointer */ |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1141 | skb->transport_header = skb->network_header + fragheaderlen; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1142 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1143 | skb->ip_summed = CHECKSUM_PARTIAL; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1144 | skb->csum = 0; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1145 | } |
| 1146 | |
| 1147 | err = skb_append_datato_frags(sk,skb, getfrag, from, |
| 1148 | (length - transhdrlen)); |
| 1149 | if (!err) { |
| 1150 | struct frag_hdr fhdr; |
| 1151 | |
Sridhar Samudrala | c31d532 | 2009-07-09 08:09:58 +0000 | [diff] [blame] | 1152 | /* Specify the length of each IPv6 datagram fragment. |
| 1153 | * It has to be a multiple of 8. |
| 1154 | */ |
| 1155 | skb_shinfo(skb)->gso_size = (mtu - fragheaderlen - |
| 1156 | sizeof(struct frag_hdr)) & ~7; |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 1157 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
Eric Dumazet | 87c48fa | 2011-07-21 21:25:58 -0700 | [diff] [blame] | 1158 | ipv6_select_ident(&fhdr, rt); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1159 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; |
| 1160 | __skb_queue_tail(&sk->sk_write_queue, skb); |
| 1161 | |
| 1162 | return 0; |
| 1163 | } |
| 1164 | /* There is not enough support do UPD LSO, |
| 1165 | * so follow normal path |
| 1166 | */ |
| 1167 | kfree_skb(skb); |
| 1168 | |
| 1169 | return err; |
| 1170 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1172 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
| 1173 | gfp_t gfp) |
| 1174 | { |
| 1175 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
| 1176 | } |
| 1177 | |
| 1178 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, |
| 1179 | gfp_t gfp) |
| 1180 | { |
| 1181 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
| 1182 | } |
| 1183 | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1184 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
| 1185 | int offset, int len, int odd, struct sk_buff *skb), |
| 1186 | void *from, int length, int transhdrlen, |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1187 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi6 *fl6, |
Brian Haley | 13b52cd | 2010-04-23 11:26:08 +0000 | [diff] [blame] | 1188 | struct rt6_info *rt, unsigned int flags, int dontfrag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | { |
| 1190 | struct inet_sock *inet = inet_sk(sk); |
| 1191 | struct ipv6_pinfo *np = inet6_sk(sk); |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1192 | struct inet_cork *cork; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | struct sk_buff *skb; |
| 1194 | unsigned int maxfraglen, fragheaderlen; |
| 1195 | int exthdrlen; |
| 1196 | int hh_len; |
| 1197 | int mtu; |
| 1198 | int copy; |
| 1199 | int err; |
| 1200 | int offset = 0; |
| 1201 | int csummode = CHECKSUM_NONE; |
Anders Berggren | a693e69 | 2011-02-28 12:32:11 -0800 | [diff] [blame] | 1202 | __u8 tx_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
| 1204 | if (flags&MSG_PROBE) |
| 1205 | return 0; |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1206 | cork = &inet->cork.base; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | if (skb_queue_empty(&sk->sk_write_queue)) { |
| 1208 | /* |
| 1209 | * setup for corking |
| 1210 | */ |
| 1211 | if (opt) { |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1212 | if (WARN_ON(np->cork.opt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | return -EINVAL; |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1214 | |
| 1215 | np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation); |
| 1216 | if (unlikely(np->cork.opt == NULL)) |
| 1217 | return -ENOBUFS; |
| 1218 | |
| 1219 | np->cork.opt->tot_len = opt->tot_len; |
| 1220 | np->cork.opt->opt_flen = opt->opt_flen; |
| 1221 | np->cork.opt->opt_nflen = opt->opt_nflen; |
| 1222 | |
| 1223 | np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, |
| 1224 | sk->sk_allocation); |
| 1225 | if (opt->dst0opt && !np->cork.opt->dst0opt) |
| 1226 | return -ENOBUFS; |
| 1227 | |
| 1228 | np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, |
| 1229 | sk->sk_allocation); |
| 1230 | if (opt->dst1opt && !np->cork.opt->dst1opt) |
| 1231 | return -ENOBUFS; |
| 1232 | |
| 1233 | np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, |
| 1234 | sk->sk_allocation); |
| 1235 | if (opt->hopopt && !np->cork.opt->hopopt) |
| 1236 | return -ENOBUFS; |
| 1237 | |
| 1238 | np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, |
| 1239 | sk->sk_allocation); |
| 1240 | if (opt->srcrt && !np->cork.opt->srcrt) |
| 1241 | return -ENOBUFS; |
| 1242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | /* need source address above miyazawa*/ |
| 1244 | } |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1245 | dst_hold(&rt->dst); |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1246 | cork->dst = &rt->dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1247 | inet->cork.fl.u.ip6 = *fl6; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | np->cork.hop_limit = hlimit; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1249 | np->cork.tclass = tclass; |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 1250 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1251 | rt->dst.dev->mtu : dst_mtu(rt->dst.path); |
Dave Jones | c750360 | 2006-03-20 22:44:52 -0800 | [diff] [blame] | 1252 | if (np->frag_size < mtu) { |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 1253 | if (np->frag_size) |
| 1254 | mtu = np->frag_size; |
| 1255 | } |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1256 | cork->fragsize = mtu; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1257 | if (dst_allfrag(rt->dst.path)) |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1258 | cork->flags |= IPCORK_ALLFRAG; |
| 1259 | cork->length = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | sk->sk_sndmsg_page = NULL; |
| 1261 | sk->sk_sndmsg_off = 0; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1262 | exthdrlen = rt->dst.header_len + (opt ? opt->opt_flen : 0) - |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1263 | rt->rt6i_nfheader_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | length += exthdrlen; |
| 1265 | transhdrlen += exthdrlen; |
| 1266 | } else { |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1267 | rt = (struct rt6_info *)cork->dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1268 | fl6 = &inet->cork.fl.u.ip6; |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1269 | opt = np->cork.opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | transhdrlen = 0; |
| 1271 | exthdrlen = 0; |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1272 | mtu = cork->fragsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | } |
| 1274 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1275 | hh_len = LL_RESERVED_SPACE(rt->dst.dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1277 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
Herbert Xu | b4ce927 | 2007-11-13 21:33:32 -0800 | [diff] [blame] | 1278 | (opt ? opt->opt_nflen : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
| 1280 | |
| 1281 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1282 | if (cork->length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1283 | ipv6_local_error(sk, EMSGSIZE, fl6, mtu-exthdrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | return -EMSGSIZE; |
| 1285 | } |
| 1286 | } |
| 1287 | |
Anders Berggren | a693e69 | 2011-02-28 12:32:11 -0800 | [diff] [blame] | 1288 | /* For UDP, check if TX timestamp is enabled */ |
| 1289 | if (sk->sk_type == SOCK_DGRAM) { |
| 1290 | err = sock_tx_timestamp(sk, &tx_flags); |
| 1291 | if (err) |
| 1292 | goto error; |
| 1293 | } |
| 1294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | /* |
| 1296 | * Let's try using as much space as possible. |
| 1297 | * Use MTU if total length of the message fits into the MTU. |
| 1298 | * Otherwise, we need to reserve fragment header and |
| 1299 | * fragment alignment (= 8-15 octects, in total). |
| 1300 | * |
| 1301 | * 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] | 1302 | * of the buffer to the new fragment when we split |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | * the message. |
| 1304 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1305 | * FIXME: It may be fragmented into multiple chunks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | * at once if non-fragmentable extension headers |
| 1307 | * are too large. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1308 | * --yoshfuji |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | */ |
| 1310 | |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1311 | cork->length += length; |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 1312 | if (length > mtu) { |
| 1313 | int proto = sk->sk_protocol; |
| 1314 | if (dontfrag && (proto == IPPROTO_UDP || proto == IPPROTO_RAW)){ |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1315 | ipv6_local_rxpmtu(sk, fl6, mtu-exthdrlen); |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 1316 | return -EMSGSIZE; |
| 1317 | } |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1318 | |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 1319 | if (proto == IPPROTO_UDP && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1320 | (rt->dst.dev->features & NETIF_F_UFO)) { |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 1321 | |
| 1322 | err = ip6_ufo_append_data(sk, getfrag, from, length, |
| 1323 | hh_len, fragheaderlen, |
Eric Dumazet | 87c48fa | 2011-07-21 21:25:58 -0700 | [diff] [blame] | 1324 | transhdrlen, mtu, flags, rt); |
Brian Haley | 4b340ae | 2010-04-23 11:26:09 +0000 | [diff] [blame] | 1325 | if (err) |
| 1326 | goto error; |
| 1327 | return 0; |
| 1328 | } |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1329 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | |
| 1331 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) |
| 1332 | goto alloc_new_skb; |
| 1333 | |
| 1334 | while (length > 0) { |
| 1335 | /* Check if the remaining data fits into current packet. */ |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1336 | copy = (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | if (copy < length) |
| 1338 | copy = maxfraglen - skb->len; |
| 1339 | |
| 1340 | if (copy <= 0) { |
| 1341 | char *data; |
| 1342 | unsigned int datalen; |
| 1343 | unsigned int fraglen; |
| 1344 | unsigned int fraggap; |
| 1345 | unsigned int alloclen; |
| 1346 | struct sk_buff *skb_prev; |
| 1347 | alloc_new_skb: |
| 1348 | skb_prev = skb; |
| 1349 | |
| 1350 | /* There's no room in the current skb */ |
| 1351 | if (skb_prev) |
| 1352 | fraggap = skb_prev->len - maxfraglen; |
| 1353 | else |
| 1354 | fraggap = 0; |
| 1355 | |
| 1356 | /* |
| 1357 | * If remaining data exceeds the mtu, |
| 1358 | * we know we need more fragment(s). |
| 1359 | */ |
| 1360 | datalen = length + fraggap; |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1361 | if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | datalen = maxfraglen - fragheaderlen; |
| 1363 | |
| 1364 | fraglen = datalen + fragheaderlen; |
| 1365 | if ((flags & MSG_MORE) && |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1366 | !(rt->dst.dev->features&NETIF_F_SG)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | alloclen = mtu; |
| 1368 | else |
| 1369 | alloclen = datalen + fragheaderlen; |
| 1370 | |
| 1371 | /* |
| 1372 | * The last fragment gets additional space at tail. |
| 1373 | * Note: we overallocate on fragments with MSG_MODE |
| 1374 | * because we have no idea if we're the last one. |
| 1375 | */ |
| 1376 | if (datalen == length + fraggap) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1377 | alloclen += rt->dst.trailer_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | |
| 1379 | /* |
| 1380 | * We just reserve space for fragment header. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1381 | * Note: this may be overallocation if the message |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | * (without MSG_MORE) fits into the MTU. |
| 1383 | */ |
| 1384 | alloclen += sizeof(struct frag_hdr); |
| 1385 | |
| 1386 | if (transhdrlen) { |
| 1387 | skb = sock_alloc_send_skb(sk, |
| 1388 | alloclen + hh_len, |
| 1389 | (flags & MSG_DONTWAIT), &err); |
| 1390 | } else { |
| 1391 | skb = NULL; |
| 1392 | if (atomic_read(&sk->sk_wmem_alloc) <= |
| 1393 | 2 * sk->sk_sndbuf) |
| 1394 | skb = sock_wmalloc(sk, |
| 1395 | alloclen + hh_len, 1, |
| 1396 | sk->sk_allocation); |
| 1397 | if (unlikely(skb == NULL)) |
| 1398 | err = -ENOBUFS; |
Anders Berggren | a693e69 | 2011-02-28 12:32:11 -0800 | [diff] [blame] | 1399 | else { |
| 1400 | /* Only the initial fragment |
| 1401 | * is time stamped. |
| 1402 | */ |
| 1403 | tx_flags = 0; |
| 1404 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | } |
| 1406 | if (skb == NULL) |
| 1407 | goto error; |
| 1408 | /* |
| 1409 | * Fill in the control structures |
| 1410 | */ |
| 1411 | skb->ip_summed = csummode; |
| 1412 | skb->csum = 0; |
| 1413 | /* reserve for fragmentation */ |
| 1414 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); |
| 1415 | |
Anders Berggren | a693e69 | 2011-02-28 12:32:11 -0800 | [diff] [blame] | 1416 | if (sk->sk_type == SOCK_DGRAM) |
| 1417 | skb_shinfo(skb)->tx_flags = tx_flags; |
| 1418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | /* |
| 1420 | * Find where to start putting bytes |
| 1421 | */ |
| 1422 | data = skb_put(skb, fraglen); |
Arnaldo Carvalho de Melo | c14d245 | 2007-03-11 22:39:41 -0300 | [diff] [blame] | 1423 | skb_set_network_header(skb, exthdrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | data += fragheaderlen; |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1425 | skb->transport_header = (skb->network_header + |
| 1426 | fragheaderlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | if (fraggap) { |
| 1428 | skb->csum = skb_copy_and_csum_bits( |
| 1429 | skb_prev, maxfraglen, |
| 1430 | data + transhdrlen, fraggap, 0); |
| 1431 | skb_prev->csum = csum_sub(skb_prev->csum, |
| 1432 | skb->csum); |
| 1433 | data += fraggap; |
Herbert Xu | e9fa4f7 | 2006-08-13 20:12:58 -0700 | [diff] [blame] | 1434 | pskb_trim_unique(skb_prev, maxfraglen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | } |
| 1436 | copy = datalen - transhdrlen - fraggap; |
| 1437 | if (copy < 0) { |
| 1438 | err = -EINVAL; |
| 1439 | kfree_skb(skb); |
| 1440 | goto error; |
| 1441 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { |
| 1442 | err = -EFAULT; |
| 1443 | kfree_skb(skb); |
| 1444 | goto error; |
| 1445 | } |
| 1446 | |
| 1447 | offset += copy; |
| 1448 | length -= datalen - fraggap; |
| 1449 | transhdrlen = 0; |
| 1450 | exthdrlen = 0; |
| 1451 | csummode = CHECKSUM_NONE; |
| 1452 | |
| 1453 | /* |
| 1454 | * Put the packet on the pending queue |
| 1455 | */ |
| 1456 | __skb_queue_tail(&sk->sk_write_queue, skb); |
| 1457 | continue; |
| 1458 | } |
| 1459 | |
| 1460 | if (copy > length) |
| 1461 | copy = length; |
| 1462 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1463 | if (!(rt->dst.dev->features&NETIF_F_SG)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | unsigned int off; |
| 1465 | |
| 1466 | off = skb->len; |
| 1467 | if (getfrag(from, skb_put(skb, copy), |
| 1468 | offset, copy, off, skb) < 0) { |
| 1469 | __skb_trim(skb, off); |
| 1470 | err = -EFAULT; |
| 1471 | goto error; |
| 1472 | } |
| 1473 | } else { |
| 1474 | int i = skb_shinfo(skb)->nr_frags; |
| 1475 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; |
| 1476 | struct page *page = sk->sk_sndmsg_page; |
| 1477 | int off = sk->sk_sndmsg_off; |
| 1478 | unsigned int left; |
| 1479 | |
| 1480 | if (page && (left = PAGE_SIZE - off) > 0) { |
| 1481 | if (copy >= left) |
| 1482 | copy = left; |
| 1483 | if (page != frag->page) { |
| 1484 | if (i == MAX_SKB_FRAGS) { |
| 1485 | err = -EMSGSIZE; |
| 1486 | goto error; |
| 1487 | } |
| 1488 | get_page(page); |
| 1489 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); |
| 1490 | frag = &skb_shinfo(skb)->frags[i]; |
| 1491 | } |
| 1492 | } else if(i < MAX_SKB_FRAGS) { |
| 1493 | if (copy > PAGE_SIZE) |
| 1494 | copy = PAGE_SIZE; |
| 1495 | page = alloc_pages(sk->sk_allocation, 0); |
| 1496 | if (page == NULL) { |
| 1497 | err = -ENOMEM; |
| 1498 | goto error; |
| 1499 | } |
| 1500 | sk->sk_sndmsg_page = page; |
| 1501 | sk->sk_sndmsg_off = 0; |
| 1502 | |
| 1503 | skb_fill_page_desc(skb, i, page, 0, 0); |
| 1504 | frag = &skb_shinfo(skb)->frags[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | } else { |
| 1506 | err = -EMSGSIZE; |
| 1507 | goto error; |
| 1508 | } |
| 1509 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { |
| 1510 | err = -EFAULT; |
| 1511 | goto error; |
| 1512 | } |
| 1513 | sk->sk_sndmsg_off += copy; |
| 1514 | frag->size += copy; |
| 1515 | skb->len += copy; |
| 1516 | skb->data_len += copy; |
Herbert Xu | f945fa7 | 2008-01-22 22:39:26 -0800 | [diff] [blame] | 1517 | skb->truesize += copy; |
| 1518 | atomic_add(copy, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | } |
| 1520 | offset += copy; |
| 1521 | length -= copy; |
| 1522 | } |
| 1523 | return 0; |
| 1524 | error: |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1525 | cork->length -= length; |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 1526 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | return err; |
| 1528 | } |
| 1529 | |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1530 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
| 1531 | { |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1532 | if (np->cork.opt) { |
| 1533 | kfree(np->cork.opt->dst0opt); |
| 1534 | kfree(np->cork.opt->dst1opt); |
| 1535 | kfree(np->cork.opt->hopopt); |
| 1536 | kfree(np->cork.opt->srcrt); |
| 1537 | kfree(np->cork.opt); |
| 1538 | np->cork.opt = NULL; |
| 1539 | } |
| 1540 | |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1541 | if (inet->cork.base.dst) { |
| 1542 | dst_release(inet->cork.base.dst); |
| 1543 | inet->cork.base.dst = NULL; |
| 1544 | inet->cork.base.flags &= ~IPCORK_ALLFRAG; |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1545 | } |
| 1546 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); |
| 1547 | } |
| 1548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | int ip6_push_pending_frames(struct sock *sk) |
| 1550 | { |
| 1551 | struct sk_buff *skb, *tmp_skb; |
| 1552 | struct sk_buff **tail_skb; |
| 1553 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; |
| 1554 | struct inet_sock *inet = inet_sk(sk); |
| 1555 | struct ipv6_pinfo *np = inet6_sk(sk); |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 1556 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | struct ipv6hdr *hdr; |
| 1558 | struct ipv6_txoptions *opt = np->cork.opt; |
David S. Miller | bdc712b | 2011-05-06 15:02:07 -0700 | [diff] [blame] | 1559 | struct rt6_info *rt = (struct rt6_info *)inet->cork.base.dst; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1560 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
| 1561 | unsigned char proto = fl6->flowi6_proto; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | int err = 0; |
| 1563 | |
| 1564 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) |
| 1565 | goto out; |
| 1566 | tail_skb = &(skb_shinfo(skb)->frag_list); |
| 1567 | |
| 1568 | /* move skb->data to ip header from ext header */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1569 | if (skb->data < skb_network_header(skb)) |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1570 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1572 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | *tail_skb = tmp_skb; |
| 1574 | tail_skb = &(tmp_skb->next); |
| 1575 | skb->len += tmp_skb->len; |
| 1576 | skb->data_len += tmp_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1577 | skb->truesize += tmp_skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | tmp_skb->destructor = NULL; |
| 1579 | tmp_skb->sk = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | } |
| 1581 | |
Herbert Xu | 28a89453 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1582 | /* Allow local fragmentation. */ |
Herbert Xu | b5c15fc | 2008-02-14 23:49:37 -0800 | [diff] [blame] | 1583 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
Herbert Xu | 28a89453 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1584 | skb->local_df = 1; |
| 1585 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1586 | ipv6_addr_copy(final_dst, &fl6->daddr); |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1587 | __skb_pull(skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | if (opt && opt->opt_flen) |
| 1589 | ipv6_push_frag_opts(skb, opt, &proto); |
| 1590 | if (opt && opt->opt_nflen) |
| 1591 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); |
| 1592 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 1593 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 1594 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1595 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1596 | |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1597 | *(__be32*)hdr = fl6->flowlabel | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1598 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | hdr->hop_limit = np->cork.hop_limit; |
| 1601 | hdr->nexthdr = proto; |
David S. Miller | 4c9483b | 2011-03-12 16:22:43 -0500 | [diff] [blame] | 1602 | ipv6_addr_copy(&hdr->saddr, &fl6->saddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | ipv6_addr_copy(&hdr->daddr, final_dst); |
| 1604 | |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1605 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1606 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1607 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 1608 | skb_dst_set(skb, dst_clone(&rt->dst)); |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 1609 | 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] | 1610 | if (proto == IPPROTO_ICMPV6) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1611 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1612 | |
Denis V. Lunev | 5a57d4c | 2008-10-08 10:34:14 -0700 | [diff] [blame] | 1613 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 1614 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1615 | } |
| 1616 | |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 1617 | err = ip6_local_out(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | if (err) { |
| 1619 | if (err > 0) |
Eric Dumazet | 6ce9e7b | 2009-09-02 18:05:33 -0700 | [diff] [blame] | 1620 | err = net_xmit_errno(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | if (err) |
| 1622 | goto error; |
| 1623 | } |
| 1624 | |
| 1625 | out: |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1626 | ip6_cork_release(inet, np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | return err; |
| 1628 | error: |
Eric Dumazet | 0625491 | 2009-09-01 18:37:16 -0700 | [diff] [blame] | 1629 | IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | goto out; |
| 1631 | } |
| 1632 | |
| 1633 | void ip6_flush_pending_frames(struct sock *sk) |
| 1634 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | struct sk_buff *skb; |
| 1636 | |
| 1637 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1638 | if (skb_dst(skb)) |
| 1639 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | e1f52208 | 2007-09-11 11:31:43 +0200 | [diff] [blame] | 1640 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | kfree_skb(skb); |
| 1642 | } |
| 1643 | |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1644 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | } |