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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | #include <linux/netfilter.h> |
| 42 | #include <linux/netfilter_ipv6.h> |
| 43 | |
| 44 | #include <net/sock.h> |
| 45 | #include <net/snmp.h> |
| 46 | |
| 47 | #include <net/ipv6.h> |
| 48 | #include <net/ndisc.h> |
| 49 | #include <net/protocol.h> |
| 50 | #include <net/ip6_route.h> |
| 51 | #include <net/addrconf.h> |
| 52 | #include <net/rawv6.h> |
| 53 | #include <net/icmp.h> |
| 54 | #include <net/xfrm.h> |
| 55 | #include <net/checksum.h> |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 56 | #include <linux/mroute6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); |
| 59 | |
| 60 | static __inline__ void ipv6_select_ident(struct sk_buff *skb, struct frag_hdr *fhdr) |
| 61 | { |
| 62 | static u32 ipv6_fragmentation_id = 1; |
| 63 | static DEFINE_SPINLOCK(ip6_id_lock); |
| 64 | |
| 65 | spin_lock_bh(&ip6_id_lock); |
| 66 | fhdr->identification = htonl(ipv6_fragmentation_id); |
| 67 | if (++ipv6_fragmentation_id == 0) |
| 68 | ipv6_fragmentation_id = 1; |
| 69 | spin_unlock_bh(&ip6_id_lock); |
| 70 | } |
| 71 | |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 72 | int __ip6_local_out(struct sk_buff *skb) |
| 73 | { |
| 74 | int len; |
| 75 | |
| 76 | len = skb->len - sizeof(struct ipv6hdr); |
| 77 | if (len > IPV6_MAXPLEN) |
| 78 | len = 0; |
| 79 | ipv6_hdr(skb)->payload_len = htons(len); |
| 80 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 81 | return nf_hook(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb_dst(skb)->dev, |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 82 | dst_output); |
| 83 | } |
| 84 | |
| 85 | int ip6_local_out(struct sk_buff *skb) |
| 86 | { |
| 87 | int err; |
| 88 | |
| 89 | err = __ip6_local_out(skb); |
| 90 | if (likely(err == 1)) |
| 91 | err = dst_output(skb); |
| 92 | |
| 93 | return err; |
| 94 | } |
| 95 | EXPORT_SYMBOL_GPL(ip6_local_out); |
| 96 | |
Patrick McHardy | ad643a7 | 2007-10-15 01:51:38 -0700 | [diff] [blame] | 97 | static int ip6_output_finish(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 99 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 101 | if (dst->hh) |
| 102 | return neigh_hh_output(dst->hh, skb); |
| 103 | else if (dst->neighbour) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | return dst->neighbour->output(skb); |
| 105 | |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 106 | IP6_INC_STATS_BH(dev_net(dst->dev), |
| 107 | ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | kfree_skb(skb); |
| 109 | return -EINVAL; |
| 110 | |
| 111 | } |
| 112 | |
| 113 | /* dev_loopback_xmit for use with netfilter. */ |
| 114 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) |
| 115 | { |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 116 | skb_reset_mac_header(newskb); |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 117 | __skb_pull(newskb, skb_network_offset(newskb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | newskb->pkt_type = PACKET_LOOPBACK; |
| 119 | newskb->ip_summed = CHECKSUM_UNNECESSARY; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 120 | WARN_ON(!skb_dst(newskb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
| 122 | netif_rx(newskb); |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | static int ip6_output2(struct sk_buff *skb) |
| 128 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 129 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | struct net_device *dev = dst->dev; |
| 131 | |
| 132 | skb->protocol = htons(ETH_P_IPV6); |
| 133 | skb->dev = dev; |
| 134 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 135 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 137 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
| 139 | if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && |
Benjamin Thery | bd91b8b | 2008-12-10 16:07:08 -0800 | [diff] [blame] | 140 | ((mroute6_socket(dev_net(dev)) && |
| 141 | !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 142 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
| 143 | &ipv6_hdr(skb)->saddr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
| 145 | |
| 146 | /* Do not check for IFF_ALLMULTI; multicast routing |
| 147 | is not supported in any case. |
| 148 | */ |
| 149 | if (newskb) |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 150 | NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, newskb, |
| 151 | NULL, newskb->dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | ip6_dev_loopback_xmit); |
| 153 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 154 | if (ipv6_hdr(skb)->hop_limit == 0) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 155 | IP6_INC_STATS(dev_net(dev), idev, |
| 156 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | kfree_skb(skb); |
| 158 | return 0; |
| 159 | } |
| 160 | } |
| 161 | |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 162 | IP6_UPD_PO_STATS(dev_net(dev), idev, IPSTATS_MIB_OUTMCAST, |
| 163 | skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 166 | return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev, |
| 167 | ip6_output_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 170 | static inline int ip6_skb_dst_mtu(struct sk_buff *skb) |
| 171 | { |
| 172 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
| 173 | |
| 174 | return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 175 | skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 176 | } |
| 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | int ip6_output(struct sk_buff *skb) |
| 179 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 180 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 181 | if (unlikely(idev->cnf.disable_ipv6)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 182 | IP6_INC_STATS(dev_net(skb_dst(skb)->dev), idev, |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 183 | IPSTATS_MIB_OUTDISCARDS); |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 184 | kfree_skb(skb); |
| 185 | return 0; |
| 186 | } |
| 187 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 188 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 189 | dst_allfrag(skb_dst(skb))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | return ip6_fragment(skb, ip6_output2); |
| 191 | else |
| 192 | return ip6_output2(skb); |
| 193 | } |
| 194 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | /* |
| 196 | * xmit an sk_buff (used by TCP) |
| 197 | */ |
| 198 | |
| 199 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, |
| 200 | struct ipv6_txoptions *opt, int ipfragok) |
| 201 | { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 202 | struct net *net = sock_net(sk); |
Patrick McHardy | b30bd28 | 2006-03-23 01:17:25 -0800 | [diff] [blame] | 203 | struct ipv6_pinfo *np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | struct in6_addr *first_hop = &fl->fl6_dst; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 205 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | struct ipv6hdr *hdr; |
| 207 | u8 proto = fl->proto; |
| 208 | int seg_len = skb->len; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 209 | int hlimit, tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | u32 mtu; |
| 211 | |
| 212 | if (opt) { |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 213 | unsigned int head_room; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
| 215 | /* First: exthdrs may take lots of space (~8K for now) |
| 216 | MAX_HEADER is not enough. |
| 217 | */ |
| 218 | head_room = opt->opt_nflen + opt->opt_flen; |
| 219 | seg_len += head_room; |
| 220 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); |
| 221 | |
| 222 | if (skb_headroom(skb) < head_room) { |
| 223 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 224 | if (skb2 == NULL) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 225 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 226 | IPSTATS_MIB_OUTDISCARDS); |
| 227 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return -ENOBUFS; |
| 229 | } |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 230 | kfree_skb(skb); |
| 231 | skb = skb2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | if (sk) |
| 233 | skb_set_owner_w(skb, sk); |
| 234 | } |
| 235 | if (opt->opt_flen) |
| 236 | ipv6_push_frag_opts(skb, opt, &proto); |
| 237 | if (opt->opt_nflen) |
| 238 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); |
| 239 | } |
| 240 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 241 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 242 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 243 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
Wei Yongjun | 77e2f14 | 2008-07-31 20:46:47 -0700 | [diff] [blame] | 245 | /* Allow local fragmentation. */ |
| 246 | if (ipfragok) |
| 247 | skb->local_df = 1; |
| 248 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | /* |
| 250 | * Fill in the IPv6 header |
| 251 | */ |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | hlimit = -1; |
| 254 | if (np) |
| 255 | hlimit = np->hop_limit; |
| 256 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 257 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 259 | tclass = -1; |
| 260 | if (np) |
| 261 | tclass = np->tclass; |
| 262 | if (tclass < 0) |
| 263 | tclass = 0; |
| 264 | |
Al Viro | 90bcaf7 | 2006-11-08 00:25:17 -0800 | [diff] [blame] | 265 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 266 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | hdr->payload_len = htons(seg_len); |
| 268 | hdr->nexthdr = proto; |
| 269 | hdr->hop_limit = hlimit; |
| 270 | |
| 271 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); |
| 272 | ipv6_addr_copy(&hdr->daddr, first_hop); |
| 273 | |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 274 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 275 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 276 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | mtu = dst_mtu(dst); |
Wei Yongjun | 283d07ac | 2008-08-03 21:15:59 -0700 | [diff] [blame] | 278 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 279 | IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 280 | IPSTATS_MIB_OUT, skb->len); |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 281 | return NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
Harald Welte | 6869c4d | 2005-08-09 19:24:19 -0700 | [diff] [blame] | 282 | dst_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | } |
| 284 | |
| 285 | if (net_ratelimit()) |
| 286 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); |
| 287 | skb->dev = dst->dev; |
| 288 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 289 | 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] | 290 | kfree_skb(skb); |
| 291 | return -EMSGSIZE; |
| 292 | } |
| 293 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 294 | EXPORT_SYMBOL(ip6_xmit); |
| 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | /* |
| 297 | * To avoid extra problems ND packets are send through this |
| 298 | * routine. It's code duplication but I really want to avoid |
| 299 | * extra checks since ipv6_build_header is used by TCP (which |
| 300 | * is for us performance critical) |
| 301 | */ |
| 302 | |
| 303 | 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] | 304 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | int proto, int len) |
| 306 | { |
| 307 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 308 | struct ipv6hdr *hdr; |
| 309 | int totlen; |
| 310 | |
| 311 | skb->protocol = htons(ETH_P_IPV6); |
| 312 | skb->dev = dev; |
| 313 | |
| 314 | totlen = len + sizeof(struct ipv6hdr); |
| 315 | |
Arnaldo Carvalho de Melo | 55f79cc | 2007-03-14 21:05:03 -0300 | [diff] [blame] | 316 | skb_reset_network_header(skb); |
| 317 | skb_put(skb, sizeof(struct ipv6hdr)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 318 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Al Viro | ae08e1f | 2006-11-08 00:27:11 -0800 | [diff] [blame] | 320 | *(__be32*)hdr = htonl(0x60000000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | hdr->payload_len = htons(len); |
| 323 | hdr->nexthdr = proto; |
| 324 | hdr->hop_limit = np->hop_limit; |
| 325 | |
| 326 | ipv6_addr_copy(&hdr->saddr, saddr); |
| 327 | ipv6_addr_copy(&hdr->daddr, daddr); |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
| 333 | { |
| 334 | struct ip6_ra_chain *ra; |
| 335 | struct sock *last = NULL; |
| 336 | |
| 337 | read_lock(&ip6_ra_lock); |
| 338 | for (ra = ip6_ra_chain; ra; ra = ra->next) { |
| 339 | struct sock *sk = ra->sk; |
Andrew McDonald | 0bd1b59 | 2005-08-09 19:44:42 -0700 | [diff] [blame] | 340 | if (sk && ra->sel == sel && |
| 341 | (!sk->sk_bound_dev_if || |
| 342 | sk->sk_bound_dev_if == skb->dev->ifindex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | if (last) { |
| 344 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 345 | if (skb2) |
| 346 | rawv6_rcv(last, skb2); |
| 347 | } |
| 348 | last = sk; |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | if (last) { |
| 353 | rawv6_rcv(last, skb); |
| 354 | read_unlock(&ip6_ra_lock); |
| 355 | return 1; |
| 356 | } |
| 357 | read_unlock(&ip6_ra_lock); |
| 358 | return 0; |
| 359 | } |
| 360 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 361 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
| 362 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 363 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 364 | u8 nexthdr = hdr->nexthdr; |
| 365 | int offset; |
| 366 | |
| 367 | if (ipv6_ext_hdr(nexthdr)) { |
| 368 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); |
| 369 | if (offset < 0) |
| 370 | return 0; |
| 371 | } else |
| 372 | offset = sizeof(struct ipv6hdr); |
| 373 | |
| 374 | if (nexthdr == IPPROTO_ICMPV6) { |
| 375 | struct icmp6hdr *icmp6; |
| 376 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 377 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
| 378 | offset + 1 - skb->data))) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 379 | return 0; |
| 380 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 381 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 382 | |
| 383 | switch (icmp6->icmp6_type) { |
| 384 | case NDISC_ROUTER_SOLICITATION: |
| 385 | case NDISC_ROUTER_ADVERTISEMENT: |
| 386 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 387 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 388 | case NDISC_REDIRECT: |
| 389 | /* For reaction involving unicast neighbor discovery |
| 390 | * message destined to the proxied address, pass it to |
| 391 | * input function. |
| 392 | */ |
| 393 | return 1; |
| 394 | default: |
| 395 | break; |
| 396 | } |
| 397 | } |
| 398 | |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 399 | /* |
| 400 | * The proxying router can't forward traffic sent to a link-local |
| 401 | * address, so signal the sender and discard the packet. This |
| 402 | * behavior is clarified by the MIPv6 specification. |
| 403 | */ |
| 404 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { |
| 405 | dst_link_failure(skb); |
| 406 | return -1; |
| 407 | } |
| 408 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 409 | return 0; |
| 410 | } |
| 411 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | static inline int ip6_forward_finish(struct sk_buff *skb) |
| 413 | { |
| 414 | return dst_output(skb); |
| 415 | } |
| 416 | |
| 417 | int ip6_forward(struct sk_buff *skb) |
| 418 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 419 | struct dst_entry *dst = skb_dst(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 420 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | struct inet6_skb_parm *opt = IP6CB(skb); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 422 | struct net *net = dev_net(dst->dev); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 423 | |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 424 | if (net->ipv6.devconf_all->forwarding == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | goto error; |
| 426 | |
Ben Hutchings | 4497b07 | 2008-06-19 16:22:28 -0700 | [diff] [blame] | 427 | if (skb_warn_if_lro(skb)) |
| 428 | goto drop; |
| 429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 431 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | goto drop; |
| 433 | } |
| 434 | |
Herbert Xu | 35fc92a | 2007-03-26 23:22:20 -0700 | [diff] [blame] | 435 | skb_forward_csum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | |
| 437 | /* |
| 438 | * We DO NOT make any processing on |
| 439 | * RA packets, pushing them to user level AS IS |
| 440 | * without ane WARRANTY that application will be able |
| 441 | * to interpret them. The reason is that we |
| 442 | * cannot make anything clever here. |
| 443 | * |
| 444 | * We are not end-node, so that if packet contains |
| 445 | * AH/ESP, we cannot make anything. |
| 446 | * Defragmentation also would be mistake, RA packets |
| 447 | * cannot be fragmented, because there is no warranty |
| 448 | * that different fragments will go along one path. --ANK |
| 449 | */ |
| 450 | if (opt->ra) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 451 | u8 *ptr = skb_network_header(skb) + opt->ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
| 453 | return 0; |
| 454 | } |
| 455 | |
| 456 | /* |
| 457 | * check and decrement ttl |
| 458 | */ |
| 459 | if (hdr->hop_limit <= 1) { |
| 460 | /* Force OUTPUT device used as source address */ |
| 461 | skb->dev = dst->dev; |
| 462 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
| 463 | 0, skb->dev); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 464 | IP6_INC_STATS_BH(net, |
| 465 | ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | |
| 467 | kfree_skb(skb); |
| 468 | return -ETIMEDOUT; |
| 469 | } |
| 470 | |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 471 | /* XXX: idev->cnf.proxy_ndp? */ |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 472 | if (net->ipv6.devconf_all->proxy_ndp && |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 473 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 474 | int proxied = ip6_forward_proxy_check(skb); |
| 475 | if (proxied > 0) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 476 | return ip6_input(skb); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 477 | else if (proxied < 0) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 478 | IP6_INC_STATS(net, ip6_dst_idev(dst), |
| 479 | IPSTATS_MIB_INDISCARDS); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 480 | goto drop; |
| 481 | } |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 482 | } |
| 483 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | if (!xfrm6_route_forward(skb)) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 485 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | goto drop; |
| 487 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 488 | dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
| 490 | /* IPv6 specs say nothing about it, but it is clear that we cannot |
| 491 | send redirects to source routed frames. |
Masahide NAKAMURA | 1e5dc14 | 2007-08-24 19:08:55 +0900 | [diff] [blame] | 492 | We don't send redirects to frames decapsulated from IPsec. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | */ |
Masahide NAKAMURA | 1e5dc14 | 2007-08-24 19:08:55 +0900 | [diff] [blame] | 494 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 && |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 495 | !skb_sec_path(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | struct in6_addr *target = NULL; |
| 497 | struct rt6_info *rt; |
| 498 | struct neighbour *n = dst->neighbour; |
| 499 | |
| 500 | /* |
| 501 | * incoming and outgoing devices are the same |
| 502 | * send a redirect. |
| 503 | */ |
| 504 | |
| 505 | rt = (struct rt6_info *) dst; |
| 506 | if ((rt->rt6i_flags & RTF_GATEWAY)) |
| 507 | target = (struct in6_addr*)&n->primary_key; |
| 508 | else |
| 509 | target = &hdr->daddr; |
| 510 | |
| 511 | /* Limit redirects both by destination (here) |
| 512 | and by source (inside ndisc_send_redirect) |
| 513 | */ |
| 514 | if (xrlim_allow(dst, 1*HZ)) |
| 515 | ndisc_send_redirect(skb, n, target); |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 516 | } else { |
| 517 | int addrtype = ipv6_addr_type(&hdr->saddr); |
| 518 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | /* This check is security critical. */ |
YOSHIFUJI Hideaki | f81b2e7 | 2008-06-25 16:55:26 +0900 | [diff] [blame] | 520 | if (addrtype == IPV6_ADDR_ANY || |
| 521 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 522 | goto error; |
| 523 | if (addrtype & IPV6_ADDR_LINKLOCAL) { |
| 524 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, |
| 525 | ICMPV6_NOT_NEIGHBOUR, 0, skb->dev); |
| 526 | goto error; |
| 527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
| 530 | if (skb->len > dst_mtu(dst)) { |
| 531 | /* Again, force OUTPUT device used as source address */ |
| 532 | skb->dev = dst->dev; |
| 533 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 534 | IP6_INC_STATS_BH(net, |
| 535 | ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); |
| 536 | IP6_INC_STATS_BH(net, |
| 537 | ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | kfree_skb(skb); |
| 539 | return -EMSGSIZE; |
| 540 | } |
| 541 | |
| 542 | if (skb_cow(skb, dst->dev->hard_header_len)) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 543 | IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | goto drop; |
| 545 | } |
| 546 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 547 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
| 549 | /* Mangling hops number delayed to point after skb COW */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | hdr->hop_limit--; |
| 552 | |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 553 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 554 | return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
| 555 | ip6_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
| 557 | error: |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 558 | IP6_INC_STATS_BH(net, ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | drop: |
| 560 | kfree_skb(skb); |
| 561 | return -EINVAL; |
| 562 | } |
| 563 | |
| 564 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) |
| 565 | { |
| 566 | to->pkt_type = from->pkt_type; |
| 567 | to->priority = from->priority; |
| 568 | to->protocol = from->protocol; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 569 | skb_dst_drop(to); |
| 570 | skb_dst_set(to, dst_clone(skb_dst(from))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | to->dev = from->dev; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 572 | to->mark = from->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | #ifdef CONFIG_NET_SCHED |
| 575 | to->tc_index = from->tc_index; |
| 576 | #endif |
Yasuyuki Kozakai | e7ac05f | 2007-03-14 16:44:01 -0700 | [diff] [blame] | 577 | nf_copy(to, from); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 578 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 579 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
| 580 | to->nf_trace = from->nf_trace; |
| 581 | #endif |
James Morris | 984bc16 | 2006-06-09 00:29:17 -0700 | [diff] [blame] | 582 | skb_copy_secmark(to, from); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | } |
| 584 | |
| 585 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
| 586 | { |
| 587 | u16 offset = sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 588 | struct ipv6_opt_hdr *exthdr = |
| 589 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 590 | unsigned int packet_len = skb->tail - skb->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | int found_rhdr = 0; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 592 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | while (offset + 1 <= packet_len) { |
| 595 | |
| 596 | switch (**nexthdr) { |
| 597 | |
| 598 | case NEXTHDR_HOP: |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 599 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | case NEXTHDR_ROUTING: |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 601 | found_rhdr = 1; |
| 602 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | case NEXTHDR_DEST: |
Masahide NAKAMURA | 59fbb3a | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 604 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 605 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
| 606 | break; |
| 607 | #endif |
| 608 | if (found_rhdr) |
| 609 | return offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | break; |
| 611 | default : |
| 612 | return offset; |
| 613 | } |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 614 | |
| 615 | offset += ipv6_optlen(exthdr); |
| 616 | *nexthdr = &exthdr->nexthdr; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 617 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
| 618 | offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | return offset; |
| 622 | } |
| 623 | |
| 624 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
| 625 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | struct sk_buff *frag; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 627 | struct rt6_info *rt = (struct rt6_info*)skb_dst(skb); |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 628 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | struct ipv6hdr *tmp_hdr; |
| 630 | struct frag_hdr *fh; |
| 631 | unsigned int mtu, hlen, left, len; |
Al Viro | ae08e1f | 2006-11-08 00:27:11 -0800 | [diff] [blame] | 632 | __be32 frag_id = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | int ptr, offset = 0, err=0; |
| 634 | u8 *prevhdr, nexthdr = 0; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 635 | struct net *net = dev_net(skb_dst(skb)->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
| 638 | nexthdr = *prevhdr; |
| 639 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 640 | mtu = ip6_skb_dst_mtu(skb); |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 641 | |
| 642 | /* We must not fragment if the socket is set to force MTU discovery |
| 643 | * or if the skb it not generated by a local socket. (This last |
| 644 | * check should be redundant, but it's free.) |
| 645 | */ |
Herbert Xu | b5c15fc | 2008-02-14 23:49:37 -0800 | [diff] [blame] | 646 | if (!skb->local_df) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 647 | skb->dev = skb_dst(skb)->dev; |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 648 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 649 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 650 | IPSTATS_MIB_FRAGFAILS); |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 651 | kfree_skb(skb); |
| 652 | return -EMSGSIZE; |
| 653 | } |
| 654 | |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 655 | if (np && np->frag_size < mtu) { |
| 656 | if (np->frag_size) |
| 657 | mtu = np->frag_size; |
| 658 | } |
| 659 | mtu -= hlen + sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 661 | if (skb_has_frags(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | int first_len = skb_pagelen(skb); |
Herbert Xu | 29ffe1a | 2008-01-28 20:45:20 -0800 | [diff] [blame] | 663 | int truesizes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | |
| 665 | if (first_len - hlen > mtu || |
| 666 | ((first_len - hlen) & 7) || |
| 667 | skb_cloned(skb)) |
| 668 | goto slow_path; |
| 669 | |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 670 | skb_walk_frags(skb, frag) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* Correct geometry. */ |
| 672 | if (frag->len > mtu || |
| 673 | ((frag->len & 7) && frag->next) || |
| 674 | skb_headroom(frag) < hlen) |
| 675 | goto slow_path; |
| 676 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | /* Partially cloned skb? */ |
| 678 | if (skb_shared(frag)) |
| 679 | goto slow_path; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 680 | |
| 681 | BUG_ON(frag->sk); |
| 682 | if (skb->sk) { |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 683 | frag->sk = skb->sk; |
| 684 | frag->destructor = sock_wfree; |
Herbert Xu | 29ffe1a | 2008-01-28 20:45:20 -0800 | [diff] [blame] | 685 | truesizes += frag->truesize; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 686 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | err = 0; |
| 690 | offset = 0; |
| 691 | frag = skb_shinfo(skb)->frag_list; |
David S. Miller | 4d9092b | 2009-06-09 00:20:05 -0700 | [diff] [blame] | 692 | skb_frag_list_init(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | /* BUILD HEADER */ |
| 694 | |
YOSHIFUJI Hideaki | 9a217a1 | 2006-12-05 13:47:21 -0800 | [diff] [blame] | 695 | *prevhdr = NEXTHDR_FRAGMENT; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 696 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | if (!tmp_hdr) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 698 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 699 | IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | return -ENOMEM; |
| 701 | } |
| 702 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | __skb_pull(skb, hlen); |
| 704 | 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] | 705 | __skb_push(skb, hlen); |
| 706 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 707 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
| 709 | ipv6_select_ident(skb, fh); |
| 710 | fh->nexthdr = nexthdr; |
| 711 | fh->reserved = 0; |
| 712 | fh->frag_off = htons(IP6_MF); |
| 713 | frag_id = fh->identification; |
| 714 | |
| 715 | first_len = skb_pagelen(skb); |
| 716 | skb->data_len = first_len - skb_headlen(skb); |
Herbert Xu | 29ffe1a | 2008-01-28 20:45:20 -0800 | [diff] [blame] | 717 | skb->truesize -= truesizes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | skb->len = first_len; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 719 | ipv6_hdr(skb)->payload_len = htons(first_len - |
| 720 | sizeof(struct ipv6hdr)); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 721 | |
| 722 | dst_hold(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | for (;;) { |
| 725 | /* Prepare header of the next frame, |
| 726 | * before previous one went down. */ |
| 727 | if (frag) { |
| 728 | frag->ip_summed = CHECKSUM_NONE; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 729 | skb_reset_transport_header(frag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | 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] | 731 | __skb_push(frag, hlen); |
| 732 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 733 | memcpy(skb_network_header(frag), tmp_hdr, |
| 734 | hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
| 736 | fh->nexthdr = nexthdr; |
| 737 | fh->reserved = 0; |
| 738 | fh->frag_off = htons(offset); |
| 739 | if (frag->next != NULL) |
| 740 | fh->frag_off |= htons(IP6_MF); |
| 741 | fh->identification = frag_id; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 742 | ipv6_hdr(frag)->payload_len = |
| 743 | htons(frag->len - |
| 744 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | ip6_copy_metadata(frag, skb); |
| 746 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 747 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | err = output(skb); |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 749 | if(!err) |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 750 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
| 751 | IPSTATS_MIB_FRAGCREATES); |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 752 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | if (err || !frag) |
| 754 | break; |
| 755 | |
| 756 | skb = frag; |
| 757 | frag = skb->next; |
| 758 | skb->next = NULL; |
| 759 | } |
| 760 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 761 | kfree(tmp_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
| 763 | if (err == 0) { |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 764 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
| 765 | IPSTATS_MIB_FRAGOKS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 766 | dst_release(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | return 0; |
| 768 | } |
| 769 | |
| 770 | while (frag) { |
| 771 | skb = frag->next; |
| 772 | kfree_skb(frag); |
| 773 | frag = skb; |
| 774 | } |
| 775 | |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 776 | IP6_INC_STATS(net, ip6_dst_idev(&rt->u.dst), |
| 777 | IPSTATS_MIB_FRAGFAILS); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 778 | dst_release(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | return err; |
| 780 | } |
| 781 | |
| 782 | slow_path: |
| 783 | left = skb->len - hlen; /* Space per frame */ |
| 784 | ptr = hlen; /* Where to start from */ |
| 785 | |
| 786 | /* |
| 787 | * Fragment the datagram. |
| 788 | */ |
| 789 | |
| 790 | *prevhdr = NEXTHDR_FRAGMENT; |
| 791 | |
| 792 | /* |
| 793 | * Keep copying data until we run out. |
| 794 | */ |
| 795 | while(left > 0) { |
| 796 | len = left; |
| 797 | /* IF: it doesn't fit, use 'mtu' - the data space left */ |
| 798 | if (len > mtu) |
| 799 | len = mtu; |
| 800 | /* IF: we are not sending upto and including the packet end |
| 801 | then align the next start on an eight byte boundary */ |
| 802 | if (len < left) { |
| 803 | len &= ~7; |
| 804 | } |
| 805 | /* |
| 806 | * Allocate buffer. |
| 807 | */ |
| 808 | |
Johannes Berg | f5184d2 | 2008-05-12 20:48:31 -0700 | [diff] [blame] | 809 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) { |
Patrick McHardy | 64ce207 | 2005-08-09 20:50:53 -0700 | [diff] [blame] | 810 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 811 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 812 | IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | err = -ENOMEM; |
| 814 | goto fail; |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Set up data on packet |
| 819 | */ |
| 820 | |
| 821 | ip6_copy_metadata(frag, skb); |
| 822 | skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); |
| 823 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 824 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 825 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 826 | frag->transport_header = (frag->network_header + hlen + |
| 827 | sizeof(struct frag_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | |
| 829 | /* |
| 830 | * Charge the memory for the fragment to any owner |
| 831 | * it might possess |
| 832 | */ |
| 833 | if (skb->sk) |
| 834 | skb_set_owner_w(frag, skb->sk); |
| 835 | |
| 836 | /* |
| 837 | * Copy the packet header into the new buffer. |
| 838 | */ |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 839 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | |
| 841 | /* |
| 842 | * Build fragment header. |
| 843 | */ |
| 844 | fh->nexthdr = nexthdr; |
| 845 | fh->reserved = 0; |
Yan Zheng | f36d6ab | 2005-10-03 14:19:15 -0700 | [diff] [blame] | 846 | if (!frag_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | ipv6_select_ident(skb, fh); |
| 848 | frag_id = fh->identification; |
| 849 | } else |
| 850 | fh->identification = frag_id; |
| 851 | |
| 852 | /* |
| 853 | * Copy a block of the IP datagram. |
| 854 | */ |
Wei Yongjun | 8984e41 | 2007-08-21 20:59:08 -0700 | [diff] [blame] | 855 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | BUG(); |
| 857 | left -= len; |
| 858 | |
| 859 | fh->frag_off = htons(offset); |
| 860 | if (left > 0) |
| 861 | fh->frag_off |= htons(IP6_MF); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 862 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
| 863 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | |
| 865 | ptr += len; |
| 866 | offset += len; |
| 867 | |
| 868 | /* |
| 869 | * Put this fragment into the sending queue. |
| 870 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | err = output(frag); |
| 872 | if (err) |
| 873 | goto fail; |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 874 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 875 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 876 | IPSTATS_MIB_FRAGCREATES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 878 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 879 | IPSTATS_MIB_FRAGOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | return err; |
| 882 | |
| 883 | fail: |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 884 | IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 885 | IPSTATS_MIB_FRAGFAILS); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 886 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | return err; |
| 888 | } |
| 889 | |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 890 | static inline int ip6_rt_check(struct rt6key *rt_key, |
| 891 | struct in6_addr *fl_addr, |
| 892 | struct in6_addr *addr_cache) |
| 893 | { |
| 894 | return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
| 895 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache))); |
| 896 | } |
| 897 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 898 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
| 899 | struct dst_entry *dst, |
| 900 | struct flowi *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 902 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 903 | struct rt6_info *rt = (struct rt6_info *)dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 905 | if (!dst) |
| 906 | goto out; |
| 907 | |
| 908 | /* Yes, checking route validity in not connected |
| 909 | * case is not very simple. Take into account, |
| 910 | * that we do not support routing by source, TOS, |
| 911 | * and MSG_DONTROUTE --ANK (980726) |
| 912 | * |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 913 | * 1. ip6_rt_check(): If route was host route, |
| 914 | * check that cached destination is current. |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 915 | * If it is network route, we still may |
| 916 | * check its validity using saved pointer |
| 917 | * to the last used address: daddr_cache. |
| 918 | * We do not want to save whole address now, |
| 919 | * (because main consumer of this service |
| 920 | * is tcp, which has not this problem), |
| 921 | * so that the last trick works only on connected |
| 922 | * sockets. |
| 923 | * 2. oif also should be the same. |
| 924 | */ |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 925 | if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) || |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 926 | #ifdef CONFIG_IPV6_SUBTREES |
| 927 | ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) || |
| 928 | #endif |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 929 | (fl->oif && fl->oif != dst->dev->ifindex)) { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 930 | dst_release(dst); |
| 931 | dst = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | } |
| 933 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 934 | out: |
| 935 | return dst; |
| 936 | } |
| 937 | |
| 938 | static int ip6_dst_lookup_tail(struct sock *sk, |
| 939 | struct dst_entry **dst, struct flowi *fl) |
| 940 | { |
| 941 | int err; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 942 | struct net *net = sock_net(sk); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 943 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | if (*dst == NULL) |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 945 | *dst = ip6_route_output(net, sk, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
| 947 | if ((err = (*dst)->error)) |
| 948 | goto out_err_release; |
| 949 | |
| 950 | if (ipv6_addr_any(&fl->fl6_src)) { |
Brian Haley | 191cd58 | 2008-08-14 15:33:21 -0700 | [diff] [blame] | 951 | err = ipv6_dev_get_saddr(net, ip6_dst_idev(*dst)->dev, |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 952 | &fl->fl6_dst, |
| 953 | sk ? inet6_sk(sk)->srcprefs : 0, |
| 954 | &fl->fl6_src); |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 955 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | goto out_err_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | } |
| 958 | |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 959 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 960 | /* |
| 961 | * Here if the dst entry we've looked up |
| 962 | * has a neighbour entry that is in the INCOMPLETE |
| 963 | * state and the src address from the flow is |
| 964 | * marked as OPTIMISTIC, we release the found |
| 965 | * dst entry and replace it instead with the |
| 966 | * dst entry of the nexthop router |
| 967 | */ |
| 968 | if ((*dst)->neighbour && !((*dst)->neighbour->nud_state & NUD_VALID)) { |
| 969 | struct inet6_ifaddr *ifp; |
| 970 | struct flowi fl_gw; |
| 971 | int redirect; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 972 | |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 973 | ifp = ipv6_get_ifaddr(net, &fl->fl6_src, |
| 974 | (*dst)->dev, 1); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 975 | |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 976 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); |
| 977 | if (ifp) |
| 978 | in6_ifa_put(ifp); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 979 | |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 980 | if (redirect) { |
| 981 | /* |
| 982 | * We need to get the dst entry for the |
| 983 | * default router instead |
| 984 | */ |
| 985 | dst_release(*dst); |
| 986 | memcpy(&fl_gw, fl, sizeof(struct flowi)); |
| 987 | memset(&fl_gw.fl6_dst, 0, sizeof(struct in6_addr)); |
| 988 | *dst = ip6_route_output(net, sk, &fl_gw); |
| 989 | if ((err = (*dst)->error)) |
| 990 | goto out_err_release; |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 991 | } |
Neil Horman | e550dfb | 2008-09-09 13:51:35 -0700 | [diff] [blame] | 992 | } |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 993 | #endif |
| 994 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | return 0; |
| 996 | |
| 997 | out_err_release: |
Mitsuru Chinen | ca46f9c | 2007-12-05 22:31:47 -0800 | [diff] [blame] | 998 | if (err == -ENETUNREACH) |
Denis V. Lunev | 483a47d | 2008-10-08 11:09:27 -0700 | [diff] [blame] | 999 | IP6_INC_STATS_BH(net, NULL, IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | dst_release(*dst); |
| 1001 | *dst = NULL; |
| 1002 | return err; |
| 1003 | } |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 1004 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1005 | /** |
| 1006 | * ip6_dst_lookup - perform route lookup on flow |
| 1007 | * @sk: socket which provides route info |
| 1008 | * @dst: pointer to dst_entry * for result |
| 1009 | * @fl: flow to lookup |
| 1010 | * |
| 1011 | * This function performs a route lookup on the given flow. |
| 1012 | * |
| 1013 | * It returns zero on success, or a standard errno code on error. |
| 1014 | */ |
| 1015 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) |
| 1016 | { |
| 1017 | *dst = NULL; |
| 1018 | return ip6_dst_lookup_tail(sk, dst, fl); |
| 1019 | } |
Arnaldo Carvalho de Melo | 3cf3dc6 | 2005-12-13 23:23:20 -0800 | [diff] [blame] | 1020 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
| 1021 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1022 | /** |
| 1023 | * ip6_sk_dst_lookup - perform socket cached route lookup on flow |
| 1024 | * @sk: socket which provides the dst cache and route info |
| 1025 | * @dst: pointer to dst_entry * for result |
| 1026 | * @fl: flow to lookup |
| 1027 | * |
| 1028 | * This function performs a route lookup on the given flow with the |
| 1029 | * possibility of using the cached route in the socket if it is valid. |
| 1030 | * It will take the socket dst lock when operating on the dst cache. |
| 1031 | * As a result, this function can only be used in process context. |
| 1032 | * |
| 1033 | * It returns zero on success, or a standard errno code on error. |
| 1034 | */ |
| 1035 | int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) |
| 1036 | { |
| 1037 | *dst = NULL; |
| 1038 | if (sk) { |
| 1039 | *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
| 1040 | *dst = ip6_sk_dst_check(sk, *dst, fl); |
| 1041 | } |
| 1042 | |
| 1043 | return ip6_dst_lookup_tail(sk, dst, fl); |
| 1044 | } |
| 1045 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup); |
| 1046 | |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 1047 | static inline int ip6_ufo_append_data(struct sock *sk, |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1048 | int getfrag(void *from, char *to, int offset, int len, |
| 1049 | int odd, struct sk_buff *skb), |
| 1050 | void *from, int length, int hh_len, int fragheaderlen, |
| 1051 | int transhdrlen, int mtu,unsigned int flags) |
| 1052 | |
| 1053 | { |
| 1054 | struct sk_buff *skb; |
| 1055 | int err; |
| 1056 | |
| 1057 | /* There is support for UDP large send offload by network |
| 1058 | * device, so create one single skb packet containing complete |
| 1059 | * udp datagram |
| 1060 | */ |
| 1061 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { |
| 1062 | skb = sock_alloc_send_skb(sk, |
| 1063 | hh_len + fragheaderlen + transhdrlen + 20, |
| 1064 | (flags & MSG_DONTWAIT), &err); |
| 1065 | if (skb == NULL) |
| 1066 | return -ENOMEM; |
| 1067 | |
| 1068 | /* reserve space for Hardware header */ |
| 1069 | skb_reserve(skb, hh_len); |
| 1070 | |
| 1071 | /* create space for UDP/IP header */ |
| 1072 | skb_put(skb,fragheaderlen + transhdrlen); |
| 1073 | |
| 1074 | /* initialize network header pointer */ |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1075 | skb_reset_network_header(skb); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1076 | |
| 1077 | /* initialize protocol header pointer */ |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1078 | skb->transport_header = skb->network_header + fragheaderlen; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1079 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1080 | skb->ip_summed = CHECKSUM_PARTIAL; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1081 | skb->csum = 0; |
| 1082 | sk->sk_sndmsg_off = 0; |
| 1083 | } |
| 1084 | |
| 1085 | err = skb_append_datato_frags(sk,skb, getfrag, from, |
| 1086 | (length - transhdrlen)); |
| 1087 | if (!err) { |
| 1088 | struct frag_hdr fhdr; |
| 1089 | |
| 1090 | /* specify the length of each IP datagram fragment*/ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1091 | skb_shinfo(skb)->gso_size = mtu - fragheaderlen - |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 1092 | sizeof(struct frag_hdr); |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 1093 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1094 | ipv6_select_ident(skb, &fhdr); |
| 1095 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; |
| 1096 | __skb_queue_tail(&sk->sk_write_queue, skb); |
| 1097 | |
| 1098 | return 0; |
| 1099 | } |
| 1100 | /* There is not enough support do UPD LSO, |
| 1101 | * so follow normal path |
| 1102 | */ |
| 1103 | kfree_skb(skb); |
| 1104 | |
| 1105 | return err; |
| 1106 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1108 | static inline struct ipv6_opt_hdr *ip6_opt_dup(struct ipv6_opt_hdr *src, |
| 1109 | gfp_t gfp) |
| 1110 | { |
| 1111 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
| 1112 | } |
| 1113 | |
| 1114 | static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src, |
| 1115 | gfp_t gfp) |
| 1116 | { |
| 1117 | return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL; |
| 1118 | } |
| 1119 | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1120 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
| 1121 | int offset, int len, int odd, struct sk_buff *skb), |
| 1122 | void *from, int length, int transhdrlen, |
| 1123 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl, |
| 1124 | struct rt6_info *rt, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | { |
| 1126 | struct inet_sock *inet = inet_sk(sk); |
| 1127 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1128 | struct sk_buff *skb; |
| 1129 | unsigned int maxfraglen, fragheaderlen; |
| 1130 | int exthdrlen; |
| 1131 | int hh_len; |
| 1132 | int mtu; |
| 1133 | int copy; |
| 1134 | int err; |
| 1135 | int offset = 0; |
| 1136 | int csummode = CHECKSUM_NONE; |
| 1137 | |
| 1138 | if (flags&MSG_PROBE) |
| 1139 | return 0; |
| 1140 | if (skb_queue_empty(&sk->sk_write_queue)) { |
| 1141 | /* |
| 1142 | * setup for corking |
| 1143 | */ |
| 1144 | if (opt) { |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1145 | if (WARN_ON(np->cork.opt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1146 | return -EINVAL; |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1147 | |
| 1148 | np->cork.opt = kmalloc(opt->tot_len, sk->sk_allocation); |
| 1149 | if (unlikely(np->cork.opt == NULL)) |
| 1150 | return -ENOBUFS; |
| 1151 | |
| 1152 | np->cork.opt->tot_len = opt->tot_len; |
| 1153 | np->cork.opt->opt_flen = opt->opt_flen; |
| 1154 | np->cork.opt->opt_nflen = opt->opt_nflen; |
| 1155 | |
| 1156 | np->cork.opt->dst0opt = ip6_opt_dup(opt->dst0opt, |
| 1157 | sk->sk_allocation); |
| 1158 | if (opt->dst0opt && !np->cork.opt->dst0opt) |
| 1159 | return -ENOBUFS; |
| 1160 | |
| 1161 | np->cork.opt->dst1opt = ip6_opt_dup(opt->dst1opt, |
| 1162 | sk->sk_allocation); |
| 1163 | if (opt->dst1opt && !np->cork.opt->dst1opt) |
| 1164 | return -ENOBUFS; |
| 1165 | |
| 1166 | np->cork.opt->hopopt = ip6_opt_dup(opt->hopopt, |
| 1167 | sk->sk_allocation); |
| 1168 | if (opt->hopopt && !np->cork.opt->hopopt) |
| 1169 | return -ENOBUFS; |
| 1170 | |
| 1171 | np->cork.opt->srcrt = ip6_rthdr_dup(opt->srcrt, |
| 1172 | sk->sk_allocation); |
| 1173 | if (opt->srcrt && !np->cork.opt->srcrt) |
| 1174 | return -ENOBUFS; |
| 1175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | /* need source address above miyazawa*/ |
| 1177 | } |
| 1178 | dst_hold(&rt->u.dst); |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1179 | inet->cork.dst = &rt->u.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | inet->cork.fl = *fl; |
| 1181 | np->cork.hop_limit = hlimit; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1182 | np->cork.tclass = tclass; |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 1183 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? |
| 1184 | rt->u.dst.dev->mtu : dst_mtu(rt->u.dst.path); |
Dave Jones | c750360 | 2006-03-20 22:44:52 -0800 | [diff] [blame] | 1185 | if (np->frag_size < mtu) { |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 1186 | if (np->frag_size) |
| 1187 | mtu = np->frag_size; |
| 1188 | } |
| 1189 | inet->cork.fragsize = mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | if (dst_allfrag(rt->u.dst.path)) |
| 1191 | inet->cork.flags |= IPCORK_ALLFRAG; |
| 1192 | inet->cork.length = 0; |
| 1193 | sk->sk_sndmsg_page = NULL; |
| 1194 | sk->sk_sndmsg_off = 0; |
Herbert Xu | 01488942 | 2007-11-13 21:32:26 -0800 | [diff] [blame] | 1195 | exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0) - |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1196 | rt->rt6i_nfheader_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | length += exthdrlen; |
| 1198 | transhdrlen += exthdrlen; |
| 1199 | } else { |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1200 | rt = (struct rt6_info *)inet->cork.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | fl = &inet->cork.fl; |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1202 | opt = np->cork.opt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | transhdrlen = 0; |
| 1204 | exthdrlen = 0; |
| 1205 | mtu = inet->cork.fragsize; |
| 1206 | } |
| 1207 | |
| 1208 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); |
| 1209 | |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1210 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
Herbert Xu | b4ce927 | 2007-11-13 21:33:32 -0800 | [diff] [blame] | 1211 | (opt ? opt->opt_nflen : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
| 1213 | |
| 1214 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { |
| 1215 | if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { |
| 1216 | ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); |
| 1217 | return -EMSGSIZE; |
| 1218 | } |
| 1219 | } |
| 1220 | |
| 1221 | /* |
| 1222 | * Let's try using as much space as possible. |
| 1223 | * Use MTU if total length of the message fits into the MTU. |
| 1224 | * Otherwise, we need to reserve fragment header and |
| 1225 | * fragment alignment (= 8-15 octects, in total). |
| 1226 | * |
| 1227 | * 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] | 1228 | * of the buffer to the new fragment when we split |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | * the message. |
| 1230 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1231 | * FIXME: It may be fragmented into multiple chunks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | * at once if non-fragmentable extension headers |
| 1233 | * are too large. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1234 | * --yoshfuji |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | */ |
| 1236 | |
| 1237 | inet->cork.length += length; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1238 | if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) && |
| 1239 | (rt->u.dst.dev->features & NETIF_F_UFO)) { |
| 1240 | |
Patrick McHardy | baa829d | 2006-03-12 20:35:12 -0800 | [diff] [blame] | 1241 | err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len, |
| 1242 | fragheaderlen, transhdrlen, mtu, |
| 1243 | flags); |
| 1244 | if (err) |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1245 | goto error; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1246 | return 0; |
| 1247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | |
| 1249 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) |
| 1250 | goto alloc_new_skb; |
| 1251 | |
| 1252 | while (length > 0) { |
| 1253 | /* Check if the remaining data fits into current packet. */ |
| 1254 | copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
| 1255 | if (copy < length) |
| 1256 | copy = maxfraglen - skb->len; |
| 1257 | |
| 1258 | if (copy <= 0) { |
| 1259 | char *data; |
| 1260 | unsigned int datalen; |
| 1261 | unsigned int fraglen; |
| 1262 | unsigned int fraggap; |
| 1263 | unsigned int alloclen; |
| 1264 | struct sk_buff *skb_prev; |
| 1265 | alloc_new_skb: |
| 1266 | skb_prev = skb; |
| 1267 | |
| 1268 | /* There's no room in the current skb */ |
| 1269 | if (skb_prev) |
| 1270 | fraggap = skb_prev->len - maxfraglen; |
| 1271 | else |
| 1272 | fraggap = 0; |
| 1273 | |
| 1274 | /* |
| 1275 | * If remaining data exceeds the mtu, |
| 1276 | * we know we need more fragment(s). |
| 1277 | */ |
| 1278 | datalen = length + fraggap; |
| 1279 | if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
| 1280 | datalen = maxfraglen - fragheaderlen; |
| 1281 | |
| 1282 | fraglen = datalen + fragheaderlen; |
| 1283 | if ((flags & MSG_MORE) && |
| 1284 | !(rt->u.dst.dev->features&NETIF_F_SG)) |
| 1285 | alloclen = mtu; |
| 1286 | else |
| 1287 | alloclen = datalen + fragheaderlen; |
| 1288 | |
| 1289 | /* |
| 1290 | * The last fragment gets additional space at tail. |
| 1291 | * Note: we overallocate on fragments with MSG_MODE |
| 1292 | * because we have no idea if we're the last one. |
| 1293 | */ |
| 1294 | if (datalen == length + fraggap) |
| 1295 | alloclen += rt->u.dst.trailer_len; |
| 1296 | |
| 1297 | /* |
| 1298 | * We just reserve space for fragment header. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1299 | * Note: this may be overallocation if the message |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | * (without MSG_MORE) fits into the MTU. |
| 1301 | */ |
| 1302 | alloclen += sizeof(struct frag_hdr); |
| 1303 | |
| 1304 | if (transhdrlen) { |
| 1305 | skb = sock_alloc_send_skb(sk, |
| 1306 | alloclen + hh_len, |
| 1307 | (flags & MSG_DONTWAIT), &err); |
| 1308 | } else { |
| 1309 | skb = NULL; |
| 1310 | if (atomic_read(&sk->sk_wmem_alloc) <= |
| 1311 | 2 * sk->sk_sndbuf) |
| 1312 | skb = sock_wmalloc(sk, |
| 1313 | alloclen + hh_len, 1, |
| 1314 | sk->sk_allocation); |
| 1315 | if (unlikely(skb == NULL)) |
| 1316 | err = -ENOBUFS; |
| 1317 | } |
| 1318 | if (skb == NULL) |
| 1319 | goto error; |
| 1320 | /* |
| 1321 | * Fill in the control structures |
| 1322 | */ |
| 1323 | skb->ip_summed = csummode; |
| 1324 | skb->csum = 0; |
| 1325 | /* reserve for fragmentation */ |
| 1326 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); |
| 1327 | |
| 1328 | /* |
| 1329 | * Find where to start putting bytes |
| 1330 | */ |
| 1331 | data = skb_put(skb, fraglen); |
Arnaldo Carvalho de Melo | c14d245 | 2007-03-11 22:39:41 -0300 | [diff] [blame] | 1332 | skb_set_network_header(skb, exthdrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | data += fragheaderlen; |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1334 | skb->transport_header = (skb->network_header + |
| 1335 | fragheaderlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | if (fraggap) { |
| 1337 | skb->csum = skb_copy_and_csum_bits( |
| 1338 | skb_prev, maxfraglen, |
| 1339 | data + transhdrlen, fraggap, 0); |
| 1340 | skb_prev->csum = csum_sub(skb_prev->csum, |
| 1341 | skb->csum); |
| 1342 | data += fraggap; |
Herbert Xu | e9fa4f7 | 2006-08-13 20:12:58 -0700 | [diff] [blame] | 1343 | pskb_trim_unique(skb_prev, maxfraglen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | } |
| 1345 | copy = datalen - transhdrlen - fraggap; |
| 1346 | if (copy < 0) { |
| 1347 | err = -EINVAL; |
| 1348 | kfree_skb(skb); |
| 1349 | goto error; |
| 1350 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { |
| 1351 | err = -EFAULT; |
| 1352 | kfree_skb(skb); |
| 1353 | goto error; |
| 1354 | } |
| 1355 | |
| 1356 | offset += copy; |
| 1357 | length -= datalen - fraggap; |
| 1358 | transhdrlen = 0; |
| 1359 | exthdrlen = 0; |
| 1360 | csummode = CHECKSUM_NONE; |
| 1361 | |
| 1362 | /* |
| 1363 | * Put the packet on the pending queue |
| 1364 | */ |
| 1365 | __skb_queue_tail(&sk->sk_write_queue, skb); |
| 1366 | continue; |
| 1367 | } |
| 1368 | |
| 1369 | if (copy > length) |
| 1370 | copy = length; |
| 1371 | |
| 1372 | if (!(rt->u.dst.dev->features&NETIF_F_SG)) { |
| 1373 | unsigned int off; |
| 1374 | |
| 1375 | off = skb->len; |
| 1376 | if (getfrag(from, skb_put(skb, copy), |
| 1377 | offset, copy, off, skb) < 0) { |
| 1378 | __skb_trim(skb, off); |
| 1379 | err = -EFAULT; |
| 1380 | goto error; |
| 1381 | } |
| 1382 | } else { |
| 1383 | int i = skb_shinfo(skb)->nr_frags; |
| 1384 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; |
| 1385 | struct page *page = sk->sk_sndmsg_page; |
| 1386 | int off = sk->sk_sndmsg_off; |
| 1387 | unsigned int left; |
| 1388 | |
| 1389 | if (page && (left = PAGE_SIZE - off) > 0) { |
| 1390 | if (copy >= left) |
| 1391 | copy = left; |
| 1392 | if (page != frag->page) { |
| 1393 | if (i == MAX_SKB_FRAGS) { |
| 1394 | err = -EMSGSIZE; |
| 1395 | goto error; |
| 1396 | } |
| 1397 | get_page(page); |
| 1398 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); |
| 1399 | frag = &skb_shinfo(skb)->frags[i]; |
| 1400 | } |
| 1401 | } else if(i < MAX_SKB_FRAGS) { |
| 1402 | if (copy > PAGE_SIZE) |
| 1403 | copy = PAGE_SIZE; |
| 1404 | page = alloc_pages(sk->sk_allocation, 0); |
| 1405 | if (page == NULL) { |
| 1406 | err = -ENOMEM; |
| 1407 | goto error; |
| 1408 | } |
| 1409 | sk->sk_sndmsg_page = page; |
| 1410 | sk->sk_sndmsg_off = 0; |
| 1411 | |
| 1412 | skb_fill_page_desc(skb, i, page, 0, 0); |
| 1413 | frag = &skb_shinfo(skb)->frags[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | } else { |
| 1415 | err = -EMSGSIZE; |
| 1416 | goto error; |
| 1417 | } |
| 1418 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { |
| 1419 | err = -EFAULT; |
| 1420 | goto error; |
| 1421 | } |
| 1422 | sk->sk_sndmsg_off += copy; |
| 1423 | frag->size += copy; |
| 1424 | skb->len += copy; |
| 1425 | skb->data_len += copy; |
Herbert Xu | f945fa7 | 2008-01-22 22:39:26 -0800 | [diff] [blame] | 1426 | skb->truesize += copy; |
| 1427 | atomic_add(copy, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | } |
| 1429 | offset += copy; |
| 1430 | length -= copy; |
| 1431 | } |
| 1432 | return 0; |
| 1433 | error: |
| 1434 | inet->cork.length -= length; |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 1435 | IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | return err; |
| 1437 | } |
| 1438 | |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1439 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
| 1440 | { |
Herbert Xu | 0178b69 | 2009-02-05 15:15:50 -0800 | [diff] [blame] | 1441 | if (np->cork.opt) { |
| 1442 | kfree(np->cork.opt->dst0opt); |
| 1443 | kfree(np->cork.opt->dst1opt); |
| 1444 | kfree(np->cork.opt->hopopt); |
| 1445 | kfree(np->cork.opt->srcrt); |
| 1446 | kfree(np->cork.opt); |
| 1447 | np->cork.opt = NULL; |
| 1448 | } |
| 1449 | |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1450 | if (inet->cork.dst) { |
| 1451 | dst_release(inet->cork.dst); |
| 1452 | inet->cork.dst = NULL; |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1453 | inet->cork.flags &= ~IPCORK_ALLFRAG; |
| 1454 | } |
| 1455 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); |
| 1456 | } |
| 1457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | int ip6_push_pending_frames(struct sock *sk) |
| 1459 | { |
| 1460 | struct sk_buff *skb, *tmp_skb; |
| 1461 | struct sk_buff **tail_skb; |
| 1462 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; |
| 1463 | struct inet_sock *inet = inet_sk(sk); |
| 1464 | struct ipv6_pinfo *np = inet6_sk(sk); |
Denis V. Lunev | 3bd653c | 2008-10-08 10:54:51 -0700 | [diff] [blame] | 1465 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | struct ipv6hdr *hdr; |
| 1467 | struct ipv6_txoptions *opt = np->cork.opt; |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1468 | struct rt6_info *rt = (struct rt6_info *)inet->cork.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | struct flowi *fl = &inet->cork.fl; |
| 1470 | unsigned char proto = fl->proto; |
| 1471 | int err = 0; |
| 1472 | |
| 1473 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) |
| 1474 | goto out; |
| 1475 | tail_skb = &(skb_shinfo(skb)->frag_list); |
| 1476 | |
| 1477 | /* move skb->data to ip header from ext header */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1478 | if (skb->data < skb_network_header(skb)) |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1479 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1481 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | *tail_skb = tmp_skb; |
| 1483 | tail_skb = &(tmp_skb->next); |
| 1484 | skb->len += tmp_skb->len; |
| 1485 | skb->data_len += tmp_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | skb->truesize += tmp_skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | tmp_skb->destructor = NULL; |
| 1488 | tmp_skb->sk = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | } |
| 1490 | |
Herbert Xu | 28a8945 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1491 | /* Allow local fragmentation. */ |
Herbert Xu | b5c15fc | 2008-02-14 23:49:37 -0800 | [diff] [blame] | 1492 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
Herbert Xu | 28a8945 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1493 | skb->local_df = 1; |
| 1494 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | ipv6_addr_copy(final_dst, &fl->fl6_dst); |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1496 | __skb_pull(skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | if (opt && opt->opt_flen) |
| 1498 | ipv6_push_frag_opts(skb, opt, &proto); |
| 1499 | if (opt && opt->opt_nflen) |
| 1500 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); |
| 1501 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 1502 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 1503 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1504 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1505 | |
Al Viro | 90bcaf7 | 2006-11-08 00:25:17 -0800 | [diff] [blame] | 1506 | *(__be32*)hdr = fl->fl6_flowlabel | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1507 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | hdr->hop_limit = np->cork.hop_limit; |
| 1510 | hdr->nexthdr = proto; |
| 1511 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); |
| 1512 | ipv6_addr_copy(&hdr->daddr, final_dst); |
| 1513 | |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1514 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1515 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1516 | |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1517 | skb_dst_set(skb, dst_clone(&rt->u.dst)); |
Neil Horman | edf391f | 2009-04-27 02:45:02 -0700 | [diff] [blame] | 1518 | 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] | 1519 | if (proto == IPPROTO_ICMPV6) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1520 | struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb)); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1521 | |
Denis V. Lunev | 5a57d4c | 2008-10-08 10:34:14 -0700 | [diff] [blame] | 1522 | ICMP6MSGOUT_INC_STATS_BH(net, idev, icmp6_hdr(skb)->icmp6_type); |
Denis V. Lunev | e41b536 | 2008-10-08 10:33:26 -0700 | [diff] [blame] | 1523 | ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1524 | } |
| 1525 | |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 1526 | err = ip6_local_out(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | if (err) { |
| 1528 | if (err > 0) |
Herbert Xu | 3320da8 | 2005-04-19 22:32:22 -0700 | [diff] [blame] | 1529 | err = np->recverr ? net_xmit_errno(err) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | if (err) |
| 1531 | goto error; |
| 1532 | } |
| 1533 | |
| 1534 | out: |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1535 | ip6_cork_release(inet, np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | return err; |
| 1537 | error: |
| 1538 | goto out; |
| 1539 | } |
| 1540 | |
| 1541 | void ip6_flush_pending_frames(struct sock *sk) |
| 1542 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | struct sk_buff *skb; |
| 1544 | |
| 1545 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1546 | if (skb_dst(skb)) |
| 1547 | IP6_INC_STATS(sock_net(sk), ip6_dst_idev(skb_dst(skb)), |
YOSHIFUJI Hideaki | e1f52208 | 2007-09-11 11:31:43 +0200 | [diff] [blame] | 1548 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | kfree_skb(skb); |
| 1550 | } |
| 1551 | |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1552 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | } |