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 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 81 | return nf_hook(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dst->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 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | struct dst_entry *dst = skb->dst; |
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 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 106 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | kfree_skb(skb); |
| 108 | return -EINVAL; |
| 109 | |
| 110 | } |
| 111 | |
| 112 | /* dev_loopback_xmit for use with netfilter. */ |
| 113 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) |
| 114 | { |
Arnaldo Carvalho de Melo | 459a98e | 2007-03-19 15:30:44 -0700 | [diff] [blame] | 115 | skb_reset_mac_header(newskb); |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 116 | __skb_pull(newskb, skb_network_offset(newskb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | newskb->pkt_type = PACKET_LOOPBACK; |
| 118 | newskb->ip_summed = CHECKSUM_UNNECESSARY; |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 119 | WARN_ON(!newskb->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
| 121 | netif_rx(newskb); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | |
| 126 | static int ip6_output2(struct sk_buff *skb) |
| 127 | { |
| 128 | struct dst_entry *dst = skb->dst; |
| 129 | struct net_device *dev = dst->dev; |
| 130 | |
| 131 | skb->protocol = htons(ETH_P_IPV6); |
| 132 | skb->dev = dev; |
| 133 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 134 | if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 136 | struct inet6_dev *idev = ip6_dst_idev(skb->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
| 138 | if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && |
YOSHIFUJI Hideaki | 7bc570c | 2008-04-03 09:22:53 +0900 | [diff] [blame] | 139 | ((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) || |
| 140 | ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr, |
| 141 | &ipv6_hdr(skb)->saddr))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); |
| 143 | |
| 144 | /* Do not check for IFF_ALLMULTI; multicast routing |
| 145 | is not supported in any case. |
| 146 | */ |
| 147 | if (newskb) |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 148 | NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, newskb, |
| 149 | NULL, newskb->dev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | ip6_dev_loopback_xmit); |
| 151 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 152 | if (ipv6_hdr(skb)->hop_limit == 0) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 153 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | kfree_skb(skb); |
| 155 | return 0; |
| 156 | } |
| 157 | } |
| 158 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 159 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 162 | return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev, |
| 163 | ip6_output_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | } |
| 165 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 166 | static inline int ip6_skb_dst_mtu(struct sk_buff *skb) |
| 167 | { |
| 168 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
| 169 | |
| 170 | return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? |
| 171 | skb->dst->dev->mtu : dst_mtu(skb->dst); |
| 172 | } |
| 173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | int ip6_output(struct sk_buff *skb) |
| 175 | { |
YOSHIFUJI Hideaki | 778d80b | 2008-06-28 14:17:11 +0900 | [diff] [blame] | 176 | struct inet6_dev *idev = ip6_dst_idev(skb->dst); |
| 177 | if (unlikely(idev->cnf.disable_ipv6)) { |
| 178 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); |
| 179 | kfree_skb(skb); |
| 180 | return 0; |
| 181 | } |
| 182 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 183 | if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 184 | dst_allfrag(skb->dst)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | return ip6_fragment(skb, ip6_output2); |
| 186 | else |
| 187 | return ip6_output2(skb); |
| 188 | } |
| 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | /* |
| 191 | * xmit an sk_buff (used by TCP) |
| 192 | */ |
| 193 | |
| 194 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, |
| 195 | struct ipv6_txoptions *opt, int ipfragok) |
| 196 | { |
Patrick McHardy | b30bd28 | 2006-03-23 01:17:25 -0800 | [diff] [blame] | 197 | struct ipv6_pinfo *np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | struct in6_addr *first_hop = &fl->fl6_dst; |
| 199 | struct dst_entry *dst = skb->dst; |
| 200 | struct ipv6hdr *hdr; |
| 201 | u8 proto = fl->proto; |
| 202 | int seg_len = skb->len; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 203 | int hlimit, tclass; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | u32 mtu; |
| 205 | |
| 206 | if (opt) { |
Chuck Lever | c2636b4 | 2007-10-23 21:07:32 -0700 | [diff] [blame] | 207 | unsigned int head_room; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
| 209 | /* First: exthdrs may take lots of space (~8K for now) |
| 210 | MAX_HEADER is not enough. |
| 211 | */ |
| 212 | head_room = opt->opt_nflen + opt->opt_flen; |
| 213 | seg_len += head_room; |
| 214 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); |
| 215 | |
| 216 | if (skb_headroom(skb) < head_room) { |
| 217 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 218 | if (skb2 == NULL) { |
| 219 | IP6_INC_STATS(ip6_dst_idev(skb->dst), |
| 220 | IPSTATS_MIB_OUTDISCARDS); |
| 221 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | return -ENOBUFS; |
| 223 | } |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 224 | kfree_skb(skb); |
| 225 | skb = skb2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | if (sk) |
| 227 | skb_set_owner_w(skb, sk); |
| 228 | } |
| 229 | if (opt->opt_flen) |
| 230 | ipv6_push_frag_opts(skb, opt, &proto); |
| 231 | if (opt->opt_nflen) |
| 232 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); |
| 233 | } |
| 234 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 235 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 236 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 237 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
Wei Yongjun | 77e2f14 | 2008-07-31 20:46:47 -0700 | [diff] [blame] | 239 | /* Allow local fragmentation. */ |
| 240 | if (ipfragok) |
| 241 | skb->local_df = 1; |
| 242 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | /* |
| 244 | * Fill in the IPv6 header |
| 245 | */ |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | hlimit = -1; |
| 248 | if (np) |
| 249 | hlimit = np->hop_limit; |
| 250 | if (hlimit < 0) |
YOSHIFUJI Hideaki | 6b75d09 | 2008-03-10 06:00:30 -0400 | [diff] [blame] | 251 | hlimit = ip6_dst_hoplimit(dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 253 | tclass = -1; |
| 254 | if (np) |
| 255 | tclass = np->tclass; |
| 256 | if (tclass < 0) |
| 257 | tclass = 0; |
| 258 | |
Al Viro | 90bcaf7 | 2006-11-08 00:25:17 -0800 | [diff] [blame] | 259 | *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | hdr->payload_len = htons(seg_len); |
| 262 | hdr->nexthdr = proto; |
| 263 | hdr->hop_limit = hlimit; |
| 264 | |
| 265 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); |
| 266 | ipv6_addr_copy(&hdr->daddr, first_hop); |
| 267 | |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 268 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 269 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | mtu = dst_mtu(dst); |
Wei Yongjun | 283d07ac | 2008-08-03 21:15:59 -0700 | [diff] [blame] | 272 | if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 273 | IP6_INC_STATS(ip6_dst_idev(skb->dst), |
| 274 | IPSTATS_MIB_OUTREQUESTS); |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 275 | 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] | 276 | dst_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | if (net_ratelimit()) |
| 280 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); |
| 281 | skb->dev = dst->dev; |
| 282 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 283 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | kfree_skb(skb); |
| 285 | return -EMSGSIZE; |
| 286 | } |
| 287 | |
YOSHIFUJI Hideaki | 7159039 | 2007-02-22 22:05:40 +0900 | [diff] [blame] | 288 | EXPORT_SYMBOL(ip6_xmit); |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | /* |
| 291 | * To avoid extra problems ND packets are send through this |
| 292 | * routine. It's code duplication but I really want to avoid |
| 293 | * extra checks since ipv6_build_header is used by TCP (which |
| 294 | * is for us performance critical) |
| 295 | */ |
| 296 | |
| 297 | 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] | 298 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | int proto, int len) |
| 300 | { |
| 301 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 302 | struct ipv6hdr *hdr; |
| 303 | int totlen; |
| 304 | |
| 305 | skb->protocol = htons(ETH_P_IPV6); |
| 306 | skb->dev = dev; |
| 307 | |
| 308 | totlen = len + sizeof(struct ipv6hdr); |
| 309 | |
Arnaldo Carvalho de Melo | 55f79cc | 2007-03-14 21:05:03 -0300 | [diff] [blame] | 310 | skb_reset_network_header(skb); |
| 311 | skb_put(skb, sizeof(struct ipv6hdr)); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 312 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | |
Al Viro | ae08e1f | 2006-11-08 00:27:11 -0800 | [diff] [blame] | 314 | *(__be32*)hdr = htonl(0x60000000); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | |
| 316 | hdr->payload_len = htons(len); |
| 317 | hdr->nexthdr = proto; |
| 318 | hdr->hop_limit = np->hop_limit; |
| 319 | |
| 320 | ipv6_addr_copy(&hdr->saddr, saddr); |
| 321 | ipv6_addr_copy(&hdr->daddr, daddr); |
| 322 | |
| 323 | return 0; |
| 324 | } |
| 325 | |
| 326 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) |
| 327 | { |
| 328 | struct ip6_ra_chain *ra; |
| 329 | struct sock *last = NULL; |
| 330 | |
| 331 | read_lock(&ip6_ra_lock); |
| 332 | for (ra = ip6_ra_chain; ra; ra = ra->next) { |
| 333 | struct sock *sk = ra->sk; |
Andrew McDonald | 0bd1b59 | 2005-08-09 19:44:42 -0700 | [diff] [blame] | 334 | if (sk && ra->sel == sel && |
| 335 | (!sk->sk_bound_dev_if || |
| 336 | sk->sk_bound_dev_if == skb->dev->ifindex)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | if (last) { |
| 338 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 339 | if (skb2) |
| 340 | rawv6_rcv(last, skb2); |
| 341 | } |
| 342 | last = sk; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | if (last) { |
| 347 | rawv6_rcv(last, skb); |
| 348 | read_unlock(&ip6_ra_lock); |
| 349 | return 1; |
| 350 | } |
| 351 | read_unlock(&ip6_ra_lock); |
| 352 | return 0; |
| 353 | } |
| 354 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 355 | static int ip6_forward_proxy_check(struct sk_buff *skb) |
| 356 | { |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 357 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 358 | u8 nexthdr = hdr->nexthdr; |
| 359 | int offset; |
| 360 | |
| 361 | if (ipv6_ext_hdr(nexthdr)) { |
| 362 | offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); |
| 363 | if (offset < 0) |
| 364 | return 0; |
| 365 | } else |
| 366 | offset = sizeof(struct ipv6hdr); |
| 367 | |
| 368 | if (nexthdr == IPPROTO_ICMPV6) { |
| 369 | struct icmp6hdr *icmp6; |
| 370 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 371 | if (!pskb_may_pull(skb, (skb_network_header(skb) + |
| 372 | offset + 1 - skb->data))) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 373 | return 0; |
| 374 | |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 375 | icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset); |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 376 | |
| 377 | switch (icmp6->icmp6_type) { |
| 378 | case NDISC_ROUTER_SOLICITATION: |
| 379 | case NDISC_ROUTER_ADVERTISEMENT: |
| 380 | case NDISC_NEIGHBOUR_SOLICITATION: |
| 381 | case NDISC_NEIGHBOUR_ADVERTISEMENT: |
| 382 | case NDISC_REDIRECT: |
| 383 | /* For reaction involving unicast neighbor discovery |
| 384 | * message destined to the proxied address, pass it to |
| 385 | * input function. |
| 386 | */ |
| 387 | return 1; |
| 388 | default: |
| 389 | break; |
| 390 | } |
| 391 | } |
| 392 | |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 393 | /* |
| 394 | * The proxying router can't forward traffic sent to a link-local |
| 395 | * address, so signal the sender and discard the packet. This |
| 396 | * behavior is clarified by the MIPv6 specification. |
| 397 | */ |
| 398 | if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { |
| 399 | dst_link_failure(skb); |
| 400 | return -1; |
| 401 | } |
| 402 | |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 403 | return 0; |
| 404 | } |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | static inline int ip6_forward_finish(struct sk_buff *skb) |
| 407 | { |
| 408 | return dst_output(skb); |
| 409 | } |
| 410 | |
| 411 | int ip6_forward(struct sk_buff *skb) |
| 412 | { |
| 413 | struct dst_entry *dst = skb->dst; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 414 | struct ipv6hdr *hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | struct inet6_skb_parm *opt = IP6CB(skb); |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 416 | struct net *net = dev_net(dst->dev); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 417 | |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 418 | if (net->ipv6.devconf_all->forwarding == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | goto error; |
| 420 | |
Ben Hutchings | 4497b07 | 2008-06-19 16:22:28 -0700 | [diff] [blame] | 421 | if (skb_warn_if_lro(skb)) |
| 422 | goto drop; |
| 423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 425 | IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | goto drop; |
| 427 | } |
| 428 | |
Herbert Xu | 35fc92a | 2007-03-26 23:22:20 -0700 | [diff] [blame] | 429 | skb_forward_csum(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
| 431 | /* |
| 432 | * We DO NOT make any processing on |
| 433 | * RA packets, pushing them to user level AS IS |
| 434 | * without ane WARRANTY that application will be able |
| 435 | * to interpret them. The reason is that we |
| 436 | * cannot make anything clever here. |
| 437 | * |
| 438 | * We are not end-node, so that if packet contains |
| 439 | * AH/ESP, we cannot make anything. |
| 440 | * Defragmentation also would be mistake, RA packets |
| 441 | * cannot be fragmented, because there is no warranty |
| 442 | * that different fragments will go along one path. --ANK |
| 443 | */ |
| 444 | if (opt->ra) { |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 445 | u8 *ptr = skb_network_header(skb) + opt->ra; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) |
| 447 | return 0; |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * check and decrement ttl |
| 452 | */ |
| 453 | if (hdr->hop_limit <= 1) { |
| 454 | /* Force OUTPUT device used as source address */ |
| 455 | skb->dev = dst->dev; |
| 456 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, |
| 457 | 0, skb->dev); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 458 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
| 460 | kfree_skb(skb); |
| 461 | return -ETIMEDOUT; |
| 462 | } |
| 463 | |
YOSHIFUJI Hideaki | fbea49e | 2006-09-22 14:43:49 -0700 | [diff] [blame] | 464 | /* XXX: idev->cnf.proxy_ndp? */ |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 465 | if (net->ipv6.devconf_all->proxy_ndp && |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 466 | pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) { |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 467 | int proxied = ip6_forward_proxy_check(skb); |
| 468 | if (proxied > 0) |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 469 | return ip6_input(skb); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 470 | else if (proxied < 0) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 471 | IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
Ville Nuorvala | 74553b0 | 2006-09-22 14:42:18 -0700 | [diff] [blame] | 472 | goto drop; |
| 473 | } |
Ville Nuorvala | e21e0b5 | 2006-09-22 14:41:44 -0700 | [diff] [blame] | 474 | } |
| 475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | if (!xfrm6_route_forward(skb)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 477 | IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | goto drop; |
| 479 | } |
| 480 | dst = skb->dst; |
| 481 | |
| 482 | /* IPv6 specs say nothing about it, but it is clear that we cannot |
| 483 | send redirects to source routed frames. |
Masahide NAKAMURA | 1e5dc14 | 2007-08-24 19:08:55 +0900 | [diff] [blame] | 484 | We don't send redirects to frames decapsulated from IPsec. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | */ |
Masahide NAKAMURA | 1e5dc14 | 2007-08-24 19:08:55 +0900 | [diff] [blame] | 486 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 && |
| 487 | !skb->sp) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | struct in6_addr *target = NULL; |
| 489 | struct rt6_info *rt; |
| 490 | struct neighbour *n = dst->neighbour; |
| 491 | |
| 492 | /* |
| 493 | * incoming and outgoing devices are the same |
| 494 | * send a redirect. |
| 495 | */ |
| 496 | |
| 497 | rt = (struct rt6_info *) dst; |
| 498 | if ((rt->rt6i_flags & RTF_GATEWAY)) |
| 499 | target = (struct in6_addr*)&n->primary_key; |
| 500 | else |
| 501 | target = &hdr->daddr; |
| 502 | |
| 503 | /* Limit redirects both by destination (here) |
| 504 | and by source (inside ndisc_send_redirect) |
| 505 | */ |
| 506 | if (xrlim_allow(dst, 1*HZ)) |
| 507 | ndisc_send_redirect(skb, n, target); |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 508 | } else { |
| 509 | int addrtype = ipv6_addr_type(&hdr->saddr); |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* This check is security critical. */ |
YOSHIFUJI Hideaki | f81b2e7 | 2008-06-25 16:55:26 +0900 | [diff] [blame] | 512 | if (addrtype == IPV6_ADDR_ANY || |
| 513 | addrtype & (IPV6_ADDR_MULTICAST | IPV6_ADDR_LOOPBACK)) |
David L Stevens | 5bb1ab0 | 2007-05-09 13:53:44 -0700 | [diff] [blame] | 514 | goto error; |
| 515 | if (addrtype & IPV6_ADDR_LINKLOCAL) { |
| 516 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, |
| 517 | ICMPV6_NOT_NEIGHBOUR, 0, skb->dev); |
| 518 | goto error; |
| 519 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | |
| 522 | if (skb->len > dst_mtu(dst)) { |
| 523 | /* Again, force OUTPUT device used as source address */ |
| 524 | skb->dev = dst->dev; |
| 525 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 526 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); |
| 527 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | kfree_skb(skb); |
| 529 | return -EMSGSIZE; |
| 530 | } |
| 531 | |
| 532 | if (skb_cow(skb, dst->dev->hard_header_len)) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 533 | IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | goto drop; |
| 535 | } |
| 536 | |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 537 | hdr = ipv6_hdr(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
| 539 | /* Mangling hops number delayed to point after skb COW */ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 540 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | hdr->hop_limit--; |
| 542 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 543 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); |
Patrick McHardy | 6e23ae2 | 2007-11-19 18:53:30 -0800 | [diff] [blame] | 544 | return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dst->dev, |
| 545 | ip6_forward_finish); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | |
| 547 | error: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 548 | IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | drop: |
| 550 | kfree_skb(skb); |
| 551 | return -EINVAL; |
| 552 | } |
| 553 | |
| 554 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) |
| 555 | { |
| 556 | to->pkt_type = from->pkt_type; |
| 557 | to->priority = from->priority; |
| 558 | to->protocol = from->protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | dst_release(to->dst); |
| 560 | to->dst = dst_clone(from->dst); |
| 561 | to->dev = from->dev; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 562 | to->mark = from->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | |
| 564 | #ifdef CONFIG_NET_SCHED |
| 565 | to->tc_index = from->tc_index; |
| 566 | #endif |
Yasuyuki Kozakai | e7ac05f | 2007-03-14 16:44:01 -0700 | [diff] [blame] | 567 | nf_copy(to, from); |
Jozsef Kadlecsik | ba9dda3 | 2007-07-07 22:21:23 -0700 | [diff] [blame] | 568 | #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \ |
| 569 | defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE) |
| 570 | to->nf_trace = from->nf_trace; |
| 571 | #endif |
James Morris | 984bc16 | 2006-06-09 00:29:17 -0700 | [diff] [blame] | 572 | skb_copy_secmark(to, from); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | } |
| 574 | |
| 575 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
| 576 | { |
| 577 | u16 offset = sizeof(struct ipv6hdr); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 578 | struct ipv6_opt_hdr *exthdr = |
| 579 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 580 | unsigned int packet_len = skb->tail - skb->network_header; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | int found_rhdr = 0; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 582 | *nexthdr = &ipv6_hdr(skb)->nexthdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | |
| 584 | while (offset + 1 <= packet_len) { |
| 585 | |
| 586 | switch (**nexthdr) { |
| 587 | |
| 588 | case NEXTHDR_HOP: |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 589 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | case NEXTHDR_ROUTING: |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 591 | found_rhdr = 1; |
| 592 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | case NEXTHDR_DEST: |
Masahide NAKAMURA | 59fbb3a | 2007-06-26 23:56:32 -0700 | [diff] [blame] | 594 | #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 595 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) |
| 596 | break; |
| 597 | #endif |
| 598 | if (found_rhdr) |
| 599 | return offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | break; |
| 601 | default : |
| 602 | return offset; |
| 603 | } |
Masahide NAKAMURA | 27637df | 2006-08-23 19:29:47 -0700 | [diff] [blame] | 604 | |
| 605 | offset += ipv6_optlen(exthdr); |
| 606 | *nexthdr = &exthdr->nexthdr; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 607 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + |
| 608 | offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | } |
| 610 | |
| 611 | return offset; |
| 612 | } |
| 613 | |
| 614 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) |
| 615 | { |
| 616 | struct net_device *dev; |
| 617 | struct sk_buff *frag; |
| 618 | struct rt6_info *rt = (struct rt6_info*)skb->dst; |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 619 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | struct ipv6hdr *tmp_hdr; |
| 621 | struct frag_hdr *fh; |
| 622 | unsigned int mtu, hlen, left, len; |
Al Viro | ae08e1f | 2006-11-08 00:27:11 -0800 | [diff] [blame] | 623 | __be32 frag_id = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | int ptr, offset = 0, err=0; |
| 625 | u8 *prevhdr, nexthdr = 0; |
| 626 | |
| 627 | dev = rt->u.dst.dev; |
| 628 | hlen = ip6_find_1stfragopt(skb, &prevhdr); |
| 629 | nexthdr = *prevhdr; |
| 630 | |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 631 | mtu = ip6_skb_dst_mtu(skb); |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 632 | |
| 633 | /* We must not fragment if the socket is set to force MTU discovery |
| 634 | * or if the skb it not generated by a local socket. (This last |
| 635 | * check should be redundant, but it's free.) |
| 636 | */ |
Herbert Xu | b5c15fc | 2008-02-14 23:49:37 -0800 | [diff] [blame] | 637 | if (!skb->local_df) { |
John Heffner | b881ef7 | 2007-04-20 15:52:39 -0700 | [diff] [blame] | 638 | skb->dev = skb->dst->dev; |
| 639 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); |
| 640 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS); |
| 641 | kfree_skb(skb); |
| 642 | return -EMSGSIZE; |
| 643 | } |
| 644 | |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 645 | if (np && np->frag_size < mtu) { |
| 646 | if (np->frag_size) |
| 647 | mtu = np->frag_size; |
| 648 | } |
| 649 | mtu -= hlen + sizeof(struct frag_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | |
| 651 | if (skb_shinfo(skb)->frag_list) { |
| 652 | int first_len = skb_pagelen(skb); |
Herbert Xu | 29ffe1a | 2008-01-28 20:45:20 -0800 | [diff] [blame] | 653 | int truesizes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
| 655 | if (first_len - hlen > mtu || |
| 656 | ((first_len - hlen) & 7) || |
| 657 | skb_cloned(skb)) |
| 658 | goto slow_path; |
| 659 | |
| 660 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { |
| 661 | /* Correct geometry. */ |
| 662 | if (frag->len > mtu || |
| 663 | ((frag->len & 7) && frag->next) || |
| 664 | skb_headroom(frag) < hlen) |
| 665 | goto slow_path; |
| 666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | /* Partially cloned skb? */ |
| 668 | if (skb_shared(frag)) |
| 669 | goto slow_path; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 670 | |
| 671 | BUG_ON(frag->sk); |
| 672 | if (skb->sk) { |
| 673 | sock_hold(skb->sk); |
| 674 | frag->sk = skb->sk; |
| 675 | frag->destructor = sock_wfree; |
Herbert Xu | 29ffe1a | 2008-01-28 20:45:20 -0800 | [diff] [blame] | 676 | truesizes += frag->truesize; |
Herbert Xu | 2fdba6b | 2005-05-18 22:52:33 -0700 | [diff] [blame] | 677 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | err = 0; |
| 681 | offset = 0; |
| 682 | frag = skb_shinfo(skb)->frag_list; |
| 683 | skb_shinfo(skb)->frag_list = NULL; |
| 684 | /* BUILD HEADER */ |
| 685 | |
YOSHIFUJI Hideaki | 9a217a1 | 2006-12-05 13:47:21 -0800 | [diff] [blame] | 686 | *prevhdr = NEXTHDR_FRAGMENT; |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 687 | tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | if (!tmp_hdr) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 689 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | return -ENOMEM; |
| 691 | } |
| 692 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | __skb_pull(skb, hlen); |
| 694 | 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] | 695 | __skb_push(skb, hlen); |
| 696 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 697 | memcpy(skb_network_header(skb), tmp_hdr, hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | ipv6_select_ident(skb, fh); |
| 700 | fh->nexthdr = nexthdr; |
| 701 | fh->reserved = 0; |
| 702 | fh->frag_off = htons(IP6_MF); |
| 703 | frag_id = fh->identification; |
| 704 | |
| 705 | first_len = skb_pagelen(skb); |
| 706 | skb->data_len = first_len - skb_headlen(skb); |
Herbert Xu | 29ffe1a | 2008-01-28 20:45:20 -0800 | [diff] [blame] | 707 | skb->truesize -= truesizes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | skb->len = first_len; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 709 | ipv6_hdr(skb)->payload_len = htons(first_len - |
| 710 | sizeof(struct ipv6hdr)); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 711 | |
| 712 | dst_hold(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | for (;;) { |
| 715 | /* Prepare header of the next frame, |
| 716 | * before previous one went down. */ |
| 717 | if (frag) { |
| 718 | frag->ip_summed = CHECKSUM_NONE; |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 719 | skb_reset_transport_header(frag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | 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] | 721 | __skb_push(frag, hlen); |
| 722 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 723 | memcpy(skb_network_header(frag), tmp_hdr, |
| 724 | hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | offset += skb->len - hlen - sizeof(struct frag_hdr); |
| 726 | fh->nexthdr = nexthdr; |
| 727 | fh->reserved = 0; |
| 728 | fh->frag_off = htons(offset); |
| 729 | if (frag->next != NULL) |
| 730 | fh->frag_off |= htons(IP6_MF); |
| 731 | fh->identification = frag_id; |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 732 | ipv6_hdr(frag)->payload_len = |
| 733 | htons(frag->len - |
| 734 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | ip6_copy_metadata(frag, skb); |
| 736 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 737 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | err = output(skb); |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 739 | if(!err) |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 740 | IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGCREATES); |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | if (err || !frag) |
| 743 | break; |
| 744 | |
| 745 | skb = frag; |
| 746 | frag = skb->next; |
| 747 | skb->next = NULL; |
| 748 | } |
| 749 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 750 | kfree(tmp_hdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | if (err == 0) { |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 753 | IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGOKS); |
| 754 | dst_release(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | return 0; |
| 756 | } |
| 757 | |
| 758 | while (frag) { |
| 759 | skb = frag->next; |
| 760 | kfree_skb(frag); |
| 761 | frag = skb; |
| 762 | } |
| 763 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 764 | IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGFAILS); |
| 765 | dst_release(&rt->u.dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | return err; |
| 767 | } |
| 768 | |
| 769 | slow_path: |
| 770 | left = skb->len - hlen; /* Space per frame */ |
| 771 | ptr = hlen; /* Where to start from */ |
| 772 | |
| 773 | /* |
| 774 | * Fragment the datagram. |
| 775 | */ |
| 776 | |
| 777 | *prevhdr = NEXTHDR_FRAGMENT; |
| 778 | |
| 779 | /* |
| 780 | * Keep copying data until we run out. |
| 781 | */ |
| 782 | while(left > 0) { |
| 783 | len = left; |
| 784 | /* IF: it doesn't fit, use 'mtu' - the data space left */ |
| 785 | if (len > mtu) |
| 786 | len = mtu; |
| 787 | /* IF: we are not sending upto and including the packet end |
| 788 | then align the next start on an eight byte boundary */ |
| 789 | if (len < left) { |
| 790 | len &= ~7; |
| 791 | } |
| 792 | /* |
| 793 | * Allocate buffer. |
| 794 | */ |
| 795 | |
Johannes Berg | f5184d2 | 2008-05-12 20:48:31 -0700 | [diff] [blame] | 796 | 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] | 797 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 798 | IP6_INC_STATS(ip6_dst_idev(skb->dst), |
| 799 | IPSTATS_MIB_FRAGFAILS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | err = -ENOMEM; |
| 801 | goto fail; |
| 802 | } |
| 803 | |
| 804 | /* |
| 805 | * Set up data on packet |
| 806 | */ |
| 807 | |
| 808 | ip6_copy_metadata(frag, skb); |
| 809 | skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); |
| 810 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 811 | skb_reset_network_header(frag); |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 812 | fh = (struct frag_hdr *)(skb_network_header(frag) + hlen); |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 813 | frag->transport_header = (frag->network_header + hlen + |
| 814 | sizeof(struct frag_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
| 816 | /* |
| 817 | * Charge the memory for the fragment to any owner |
| 818 | * it might possess |
| 819 | */ |
| 820 | if (skb->sk) |
| 821 | skb_set_owner_w(frag, skb->sk); |
| 822 | |
| 823 | /* |
| 824 | * Copy the packet header into the new buffer. |
| 825 | */ |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 826 | skb_copy_from_linear_data(skb, skb_network_header(frag), hlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | |
| 828 | /* |
| 829 | * Build fragment header. |
| 830 | */ |
| 831 | fh->nexthdr = nexthdr; |
| 832 | fh->reserved = 0; |
Yan Zheng | f36d6ab | 2005-10-03 14:19:15 -0700 | [diff] [blame] | 833 | if (!frag_id) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | ipv6_select_ident(skb, fh); |
| 835 | frag_id = fh->identification; |
| 836 | } else |
| 837 | fh->identification = frag_id; |
| 838 | |
| 839 | /* |
| 840 | * Copy a block of the IP datagram. |
| 841 | */ |
Wei Yongjun | 8984e41 | 2007-08-21 20:59:08 -0700 | [diff] [blame] | 842 | if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | BUG(); |
| 844 | left -= len; |
| 845 | |
| 846 | fh->frag_off = htons(offset); |
| 847 | if (left > 0) |
| 848 | fh->frag_off |= htons(IP6_MF); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 849 | ipv6_hdr(frag)->payload_len = htons(frag->len - |
| 850 | sizeof(struct ipv6hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
| 852 | ptr += len; |
| 853 | offset += len; |
| 854 | |
| 855 | /* |
| 856 | * Put this fragment into the sending queue. |
| 857 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | err = output(frag); |
| 859 | if (err) |
| 860 | goto fail; |
Wei Dong | dafee49 | 2006-08-02 13:41:21 -0700 | [diff] [blame] | 861 | |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 862 | IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGCREATES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | } |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 864 | IP6_INC_STATS(ip6_dst_idev(skb->dst), |
| 865 | IPSTATS_MIB_FRAGOKS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | return err; |
| 868 | |
| 869 | fail: |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 870 | IP6_INC_STATS(ip6_dst_idev(skb->dst), |
| 871 | IPSTATS_MIB_FRAGFAILS); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 872 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | return err; |
| 874 | } |
| 875 | |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 876 | static inline int ip6_rt_check(struct rt6key *rt_key, |
| 877 | struct in6_addr *fl_addr, |
| 878 | struct in6_addr *addr_cache) |
| 879 | { |
| 880 | return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && |
| 881 | (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache))); |
| 882 | } |
| 883 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 884 | static struct dst_entry *ip6_sk_dst_check(struct sock *sk, |
| 885 | struct dst_entry *dst, |
| 886 | struct flowi *fl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 888 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 889 | struct rt6_info *rt = (struct rt6_info *)dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 891 | if (!dst) |
| 892 | goto out; |
| 893 | |
| 894 | /* Yes, checking route validity in not connected |
| 895 | * case is not very simple. Take into account, |
| 896 | * that we do not support routing by source, TOS, |
| 897 | * and MSG_DONTROUTE --ANK (980726) |
| 898 | * |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 899 | * 1. ip6_rt_check(): If route was host route, |
| 900 | * check that cached destination is current. |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 901 | * If it is network route, we still may |
| 902 | * check its validity using saved pointer |
| 903 | * to the last used address: daddr_cache. |
| 904 | * We do not want to save whole address now, |
| 905 | * (because main consumer of this service |
| 906 | * is tcp, which has not this problem), |
| 907 | * so that the last trick works only on connected |
| 908 | * sockets. |
| 909 | * 2. oif also should be the same. |
| 910 | */ |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 911 | 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] | 912 | #ifdef CONFIG_IPV6_SUBTREES |
| 913 | ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) || |
| 914 | #endif |
YOSHIFUJI Hideaki | cf6b198 | 2006-08-23 17:19:18 -0700 | [diff] [blame] | 915 | (fl->oif && fl->oif != dst->dev->ifindex)) { |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 916 | dst_release(dst); |
| 917 | dst = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 920 | out: |
| 921 | return dst; |
| 922 | } |
| 923 | |
| 924 | static int ip6_dst_lookup_tail(struct sock *sk, |
| 925 | struct dst_entry **dst, struct flowi *fl) |
| 926 | { |
| 927 | int err; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 928 | struct net *net = sock_net(sk); |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 929 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | if (*dst == NULL) |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 931 | *dst = ip6_route_output(net, sk, fl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
| 933 | if ((err = (*dst)->error)) |
| 934 | goto out_err_release; |
| 935 | |
| 936 | if (ipv6_addr_any(&fl->fl6_src)) { |
YOSHIFUJI Hideaki | 5e5f3f0 | 2008-03-03 21:44:34 +0900 | [diff] [blame] | 937 | err = ipv6_dev_get_saddr(ip6_dst_idev(*dst)->dev, |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 938 | &fl->fl6_dst, |
| 939 | sk ? inet6_sk(sk)->srcprefs : 0, |
| 940 | &fl->fl6_src); |
Olaf Hering | 44456d3 | 2005-07-27 11:45:17 -0700 | [diff] [blame] | 941 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | goto out_err_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
| 944 | |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 945 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD |
| 946 | /* |
| 947 | * Here if the dst entry we've looked up |
| 948 | * has a neighbour entry that is in the INCOMPLETE |
| 949 | * state and the src address from the flow is |
| 950 | * marked as OPTIMISTIC, we release the found |
| 951 | * dst entry and replace it instead with the |
| 952 | * dst entry of the nexthop router |
| 953 | */ |
| 954 | if (!((*dst)->neighbour->nud_state & NUD_VALID)) { |
| 955 | struct inet6_ifaddr *ifp; |
| 956 | struct flowi fl_gw; |
| 957 | int redirect; |
| 958 | |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 959 | ifp = ipv6_get_ifaddr(net, &fl->fl6_src, |
Daniel Lezcano | 1cab3da | 2008-01-10 22:44:09 -0800 | [diff] [blame] | 960 | (*dst)->dev, 1); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 961 | |
| 962 | redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC); |
| 963 | if (ifp) |
| 964 | in6_ifa_put(ifp); |
| 965 | |
| 966 | if (redirect) { |
| 967 | /* |
| 968 | * We need to get the dst entry for the |
| 969 | * default router instead |
| 970 | */ |
| 971 | dst_release(*dst); |
| 972 | memcpy(&fl_gw, fl, sizeof(struct flowi)); |
| 973 | memset(&fl_gw.fl6_dst, 0, sizeof(struct in6_addr)); |
Daniel Lezcano | 8a3edd8 | 2008-03-07 11:14:16 -0800 | [diff] [blame] | 974 | *dst = ip6_route_output(net, sk, &fl_gw); |
Neil Horman | 95c385b | 2007-04-25 17:08:10 -0700 | [diff] [blame] | 975 | if ((err = (*dst)->error)) |
| 976 | goto out_err_release; |
| 977 | } |
| 978 | } |
| 979 | #endif |
| 980 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | return 0; |
| 982 | |
| 983 | out_err_release: |
Mitsuru Chinen | ca46f9c | 2007-12-05 22:31:47 -0800 | [diff] [blame] | 984 | if (err == -ENETUNREACH) |
| 985 | IP6_INC_STATS_BH(NULL, IPSTATS_MIB_OUTNOROUTES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | dst_release(*dst); |
| 987 | *dst = NULL; |
| 988 | return err; |
| 989 | } |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 990 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 991 | /** |
| 992 | * ip6_dst_lookup - perform route lookup on flow |
| 993 | * @sk: socket which provides route info |
| 994 | * @dst: pointer to dst_entry * for result |
| 995 | * @fl: flow to lookup |
| 996 | * |
| 997 | * This function performs a route lookup on the given flow. |
| 998 | * |
| 999 | * It returns zero on success, or a standard errno code on error. |
| 1000 | */ |
| 1001 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) |
| 1002 | { |
| 1003 | *dst = NULL; |
| 1004 | return ip6_dst_lookup_tail(sk, dst, fl); |
| 1005 | } |
Arnaldo Carvalho de Melo | 3cf3dc6 | 2005-12-13 23:23:20 -0800 | [diff] [blame] | 1006 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
| 1007 | |
Herbert Xu | 497c615 | 2006-07-30 20:19:33 -0700 | [diff] [blame] | 1008 | /** |
| 1009 | * ip6_sk_dst_lookup - perform socket cached route lookup on flow |
| 1010 | * @sk: socket which provides the dst cache and route info |
| 1011 | * @dst: pointer to dst_entry * for result |
| 1012 | * @fl: flow to lookup |
| 1013 | * |
| 1014 | * This function performs a route lookup on the given flow with the |
| 1015 | * possibility of using the cached route in the socket if it is valid. |
| 1016 | * It will take the socket dst lock when operating on the dst cache. |
| 1017 | * As a result, this function can only be used in process context. |
| 1018 | * |
| 1019 | * It returns zero on success, or a standard errno code on error. |
| 1020 | */ |
| 1021 | int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) |
| 1022 | { |
| 1023 | *dst = NULL; |
| 1024 | if (sk) { |
| 1025 | *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); |
| 1026 | *dst = ip6_sk_dst_check(sk, *dst, fl); |
| 1027 | } |
| 1028 | |
| 1029 | return ip6_dst_lookup_tail(sk, dst, fl); |
| 1030 | } |
| 1031 | EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup); |
| 1032 | |
Adrian Bunk | 34a0b3c | 2005-11-29 16:28:56 -0800 | [diff] [blame] | 1033 | static inline int ip6_ufo_append_data(struct sock *sk, |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1034 | int getfrag(void *from, char *to, int offset, int len, |
| 1035 | int odd, struct sk_buff *skb), |
| 1036 | void *from, int length, int hh_len, int fragheaderlen, |
| 1037 | int transhdrlen, int mtu,unsigned int flags) |
| 1038 | |
| 1039 | { |
| 1040 | struct sk_buff *skb; |
| 1041 | int err; |
| 1042 | |
| 1043 | /* There is support for UDP large send offload by network |
| 1044 | * device, so create one single skb packet containing complete |
| 1045 | * udp datagram |
| 1046 | */ |
| 1047 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { |
| 1048 | skb = sock_alloc_send_skb(sk, |
| 1049 | hh_len + fragheaderlen + transhdrlen + 20, |
| 1050 | (flags & MSG_DONTWAIT), &err); |
| 1051 | if (skb == NULL) |
| 1052 | return -ENOMEM; |
| 1053 | |
| 1054 | /* reserve space for Hardware header */ |
| 1055 | skb_reserve(skb, hh_len); |
| 1056 | |
| 1057 | /* create space for UDP/IP header */ |
| 1058 | skb_put(skb,fragheaderlen + transhdrlen); |
| 1059 | |
| 1060 | /* initialize network header pointer */ |
Arnaldo Carvalho de Melo | c1d2bbe | 2007-04-10 20:45:18 -0700 | [diff] [blame] | 1061 | skb_reset_network_header(skb); |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1062 | |
| 1063 | /* initialize protocol header pointer */ |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1064 | skb->transport_header = skb->network_header + fragheaderlen; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1065 | |
Patrick McHardy | 84fa793 | 2006-08-29 16:44:56 -0700 | [diff] [blame] | 1066 | skb->ip_summed = CHECKSUM_PARTIAL; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1067 | skb->csum = 0; |
| 1068 | sk->sk_sndmsg_off = 0; |
| 1069 | } |
| 1070 | |
| 1071 | err = skb_append_datato_frags(sk,skb, getfrag, from, |
| 1072 | (length - transhdrlen)); |
| 1073 | if (!err) { |
| 1074 | struct frag_hdr fhdr; |
| 1075 | |
| 1076 | /* specify the length of each IP datagram fragment*/ |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1077 | skb_shinfo(skb)->gso_size = mtu - fragheaderlen - |
Herbert Xu | 7967168 | 2006-06-22 02:40:14 -0700 | [diff] [blame] | 1078 | sizeof(struct frag_hdr); |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 1079 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1080 | ipv6_select_ident(skb, &fhdr); |
| 1081 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; |
| 1082 | __skb_queue_tail(&sk->sk_write_queue, skb); |
| 1083 | |
| 1084 | return 0; |
| 1085 | } |
| 1086 | /* There is not enough support do UPD LSO, |
| 1087 | * so follow normal path |
| 1088 | */ |
| 1089 | kfree_skb(skb); |
| 1090 | |
| 1091 | return err; |
| 1092 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1094 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
| 1095 | int offset, int len, int odd, struct sk_buff *skb), |
| 1096 | void *from, int length, int transhdrlen, |
| 1097 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl, |
| 1098 | struct rt6_info *rt, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | { |
| 1100 | struct inet_sock *inet = inet_sk(sk); |
| 1101 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1102 | struct sk_buff *skb; |
| 1103 | unsigned int maxfraglen, fragheaderlen; |
| 1104 | int exthdrlen; |
| 1105 | int hh_len; |
| 1106 | int mtu; |
| 1107 | int copy; |
| 1108 | int err; |
| 1109 | int offset = 0; |
| 1110 | int csummode = CHECKSUM_NONE; |
| 1111 | |
| 1112 | if (flags&MSG_PROBE) |
| 1113 | return 0; |
| 1114 | if (skb_queue_empty(&sk->sk_write_queue)) { |
| 1115 | /* |
| 1116 | * setup for corking |
| 1117 | */ |
| 1118 | if (opt) { |
| 1119 | if (np->cork.opt == NULL) { |
| 1120 | np->cork.opt = kmalloc(opt->tot_len, |
| 1121 | sk->sk_allocation); |
| 1122 | if (unlikely(np->cork.opt == NULL)) |
| 1123 | return -ENOBUFS; |
| 1124 | } else if (np->cork.opt->tot_len < opt->tot_len) { |
| 1125 | printk(KERN_DEBUG "ip6_append_data: invalid option length\n"); |
| 1126 | return -EINVAL; |
| 1127 | } |
| 1128 | memcpy(np->cork.opt, opt, opt->tot_len); |
| 1129 | inet->cork.flags |= IPCORK_OPT; |
| 1130 | /* need source address above miyazawa*/ |
| 1131 | } |
| 1132 | dst_hold(&rt->u.dst); |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1133 | inet->cork.dst = &rt->u.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | inet->cork.fl = *fl; |
| 1135 | np->cork.hop_limit = hlimit; |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1136 | np->cork.tclass = tclass; |
John Heffner | 628a5c5 | 2007-04-20 15:53:27 -0700 | [diff] [blame] | 1137 | mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ? |
| 1138 | rt->u.dst.dev->mtu : dst_mtu(rt->u.dst.path); |
Dave Jones | c750360 | 2006-03-20 22:44:52 -0800 | [diff] [blame] | 1139 | if (np->frag_size < mtu) { |
YOSHIFUJI Hideaki | d91675f | 2006-02-24 13:18:33 -0800 | [diff] [blame] | 1140 | if (np->frag_size) |
| 1141 | mtu = np->frag_size; |
| 1142 | } |
| 1143 | inet->cork.fragsize = mtu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (dst_allfrag(rt->u.dst.path)) |
| 1145 | inet->cork.flags |= IPCORK_ALLFRAG; |
| 1146 | inet->cork.length = 0; |
| 1147 | sk->sk_sndmsg_page = NULL; |
| 1148 | sk->sk_sndmsg_off = 0; |
Herbert Xu | 01488942 | 2007-11-13 21:32:26 -0800 | [diff] [blame] | 1149 | exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0) - |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1150 | rt->rt6i_nfheader_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | length += exthdrlen; |
| 1152 | transhdrlen += exthdrlen; |
| 1153 | } else { |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1154 | rt = (struct rt6_info *)inet->cork.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | fl = &inet->cork.fl; |
| 1156 | if (inet->cork.flags & IPCORK_OPT) |
| 1157 | opt = np->cork.opt; |
| 1158 | transhdrlen = 0; |
| 1159 | exthdrlen = 0; |
| 1160 | mtu = inet->cork.fragsize; |
| 1161 | } |
| 1162 | |
| 1163 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); |
| 1164 | |
Masahide NAKAMURA | a1b0514 | 2007-12-20 20:41:12 -0800 | [diff] [blame] | 1165 | fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len + |
Herbert Xu | b4ce927 | 2007-11-13 21:33:32 -0800 | [diff] [blame] | 1166 | (opt ? opt->opt_nflen : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); |
| 1168 | |
| 1169 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { |
| 1170 | if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { |
| 1171 | ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); |
| 1172 | return -EMSGSIZE; |
| 1173 | } |
| 1174 | } |
| 1175 | |
| 1176 | /* |
| 1177 | * Let's try using as much space as possible. |
| 1178 | * Use MTU if total length of the message fits into the MTU. |
| 1179 | * Otherwise, we need to reserve fragment header and |
| 1180 | * fragment alignment (= 8-15 octects, in total). |
| 1181 | * |
| 1182 | * 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] | 1183 | * of the buffer to the new fragment when we split |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | * the message. |
| 1185 | * |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1186 | * FIXME: It may be fragmented into multiple chunks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | * at once if non-fragmentable extension headers |
| 1188 | * are too large. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1189 | * --yoshfuji |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | */ |
| 1191 | |
| 1192 | inet->cork.length += length; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1193 | if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) && |
| 1194 | (rt->u.dst.dev->features & NETIF_F_UFO)) { |
| 1195 | |
Patrick McHardy | baa829d | 2006-03-12 20:35:12 -0800 | [diff] [blame] | 1196 | err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len, |
| 1197 | fragheaderlen, transhdrlen, mtu, |
| 1198 | flags); |
| 1199 | if (err) |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1200 | goto error; |
Ananda Raju | e89e9cf | 2005-10-18 15:46:41 -0700 | [diff] [blame] | 1201 | return 0; |
| 1202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
| 1204 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) |
| 1205 | goto alloc_new_skb; |
| 1206 | |
| 1207 | while (length > 0) { |
| 1208 | /* Check if the remaining data fits into current packet. */ |
| 1209 | copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; |
| 1210 | if (copy < length) |
| 1211 | copy = maxfraglen - skb->len; |
| 1212 | |
| 1213 | if (copy <= 0) { |
| 1214 | char *data; |
| 1215 | unsigned int datalen; |
| 1216 | unsigned int fraglen; |
| 1217 | unsigned int fraggap; |
| 1218 | unsigned int alloclen; |
| 1219 | struct sk_buff *skb_prev; |
| 1220 | alloc_new_skb: |
| 1221 | skb_prev = skb; |
| 1222 | |
| 1223 | /* There's no room in the current skb */ |
| 1224 | if (skb_prev) |
| 1225 | fraggap = skb_prev->len - maxfraglen; |
| 1226 | else |
| 1227 | fraggap = 0; |
| 1228 | |
| 1229 | /* |
| 1230 | * If remaining data exceeds the mtu, |
| 1231 | * we know we need more fragment(s). |
| 1232 | */ |
| 1233 | datalen = length + fraggap; |
| 1234 | if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) |
| 1235 | datalen = maxfraglen - fragheaderlen; |
| 1236 | |
| 1237 | fraglen = datalen + fragheaderlen; |
| 1238 | if ((flags & MSG_MORE) && |
| 1239 | !(rt->u.dst.dev->features&NETIF_F_SG)) |
| 1240 | alloclen = mtu; |
| 1241 | else |
| 1242 | alloclen = datalen + fragheaderlen; |
| 1243 | |
| 1244 | /* |
| 1245 | * The last fragment gets additional space at tail. |
| 1246 | * Note: we overallocate on fragments with MSG_MODE |
| 1247 | * because we have no idea if we're the last one. |
| 1248 | */ |
| 1249 | if (datalen == length + fraggap) |
| 1250 | alloclen += rt->u.dst.trailer_len; |
| 1251 | |
| 1252 | /* |
| 1253 | * We just reserve space for fragment header. |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1254 | * Note: this may be overallocation if the message |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | * (without MSG_MORE) fits into the MTU. |
| 1256 | */ |
| 1257 | alloclen += sizeof(struct frag_hdr); |
| 1258 | |
| 1259 | if (transhdrlen) { |
| 1260 | skb = sock_alloc_send_skb(sk, |
| 1261 | alloclen + hh_len, |
| 1262 | (flags & MSG_DONTWAIT), &err); |
| 1263 | } else { |
| 1264 | skb = NULL; |
| 1265 | if (atomic_read(&sk->sk_wmem_alloc) <= |
| 1266 | 2 * sk->sk_sndbuf) |
| 1267 | skb = sock_wmalloc(sk, |
| 1268 | alloclen + hh_len, 1, |
| 1269 | sk->sk_allocation); |
| 1270 | if (unlikely(skb == NULL)) |
| 1271 | err = -ENOBUFS; |
| 1272 | } |
| 1273 | if (skb == NULL) |
| 1274 | goto error; |
| 1275 | /* |
| 1276 | * Fill in the control structures |
| 1277 | */ |
| 1278 | skb->ip_summed = csummode; |
| 1279 | skb->csum = 0; |
| 1280 | /* reserve for fragmentation */ |
| 1281 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); |
| 1282 | |
| 1283 | /* |
| 1284 | * Find where to start putting bytes |
| 1285 | */ |
| 1286 | data = skb_put(skb, fraglen); |
Arnaldo Carvalho de Melo | c14d245 | 2007-03-11 22:39:41 -0300 | [diff] [blame] | 1287 | skb_set_network_header(skb, exthdrlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | data += fragheaderlen; |
Arnaldo Carvalho de Melo | b0e380b | 2007-04-10 21:21:55 -0700 | [diff] [blame] | 1289 | skb->transport_header = (skb->network_header + |
| 1290 | fragheaderlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | if (fraggap) { |
| 1292 | skb->csum = skb_copy_and_csum_bits( |
| 1293 | skb_prev, maxfraglen, |
| 1294 | data + transhdrlen, fraggap, 0); |
| 1295 | skb_prev->csum = csum_sub(skb_prev->csum, |
| 1296 | skb->csum); |
| 1297 | data += fraggap; |
Herbert Xu | e9fa4f7 | 2006-08-13 20:12:58 -0700 | [diff] [blame] | 1298 | pskb_trim_unique(skb_prev, maxfraglen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | } |
| 1300 | copy = datalen - transhdrlen - fraggap; |
| 1301 | if (copy < 0) { |
| 1302 | err = -EINVAL; |
| 1303 | kfree_skb(skb); |
| 1304 | goto error; |
| 1305 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { |
| 1306 | err = -EFAULT; |
| 1307 | kfree_skb(skb); |
| 1308 | goto error; |
| 1309 | } |
| 1310 | |
| 1311 | offset += copy; |
| 1312 | length -= datalen - fraggap; |
| 1313 | transhdrlen = 0; |
| 1314 | exthdrlen = 0; |
| 1315 | csummode = CHECKSUM_NONE; |
| 1316 | |
| 1317 | /* |
| 1318 | * Put the packet on the pending queue |
| 1319 | */ |
| 1320 | __skb_queue_tail(&sk->sk_write_queue, skb); |
| 1321 | continue; |
| 1322 | } |
| 1323 | |
| 1324 | if (copy > length) |
| 1325 | copy = length; |
| 1326 | |
| 1327 | if (!(rt->u.dst.dev->features&NETIF_F_SG)) { |
| 1328 | unsigned int off; |
| 1329 | |
| 1330 | off = skb->len; |
| 1331 | if (getfrag(from, skb_put(skb, copy), |
| 1332 | offset, copy, off, skb) < 0) { |
| 1333 | __skb_trim(skb, off); |
| 1334 | err = -EFAULT; |
| 1335 | goto error; |
| 1336 | } |
| 1337 | } else { |
| 1338 | int i = skb_shinfo(skb)->nr_frags; |
| 1339 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; |
| 1340 | struct page *page = sk->sk_sndmsg_page; |
| 1341 | int off = sk->sk_sndmsg_off; |
| 1342 | unsigned int left; |
| 1343 | |
| 1344 | if (page && (left = PAGE_SIZE - off) > 0) { |
| 1345 | if (copy >= left) |
| 1346 | copy = left; |
| 1347 | if (page != frag->page) { |
| 1348 | if (i == MAX_SKB_FRAGS) { |
| 1349 | err = -EMSGSIZE; |
| 1350 | goto error; |
| 1351 | } |
| 1352 | get_page(page); |
| 1353 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); |
| 1354 | frag = &skb_shinfo(skb)->frags[i]; |
| 1355 | } |
| 1356 | } else if(i < MAX_SKB_FRAGS) { |
| 1357 | if (copy > PAGE_SIZE) |
| 1358 | copy = PAGE_SIZE; |
| 1359 | page = alloc_pages(sk->sk_allocation, 0); |
| 1360 | if (page == NULL) { |
| 1361 | err = -ENOMEM; |
| 1362 | goto error; |
| 1363 | } |
| 1364 | sk->sk_sndmsg_page = page; |
| 1365 | sk->sk_sndmsg_off = 0; |
| 1366 | |
| 1367 | skb_fill_page_desc(skb, i, page, 0, 0); |
| 1368 | frag = &skb_shinfo(skb)->frags[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | } else { |
| 1370 | err = -EMSGSIZE; |
| 1371 | goto error; |
| 1372 | } |
| 1373 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { |
| 1374 | err = -EFAULT; |
| 1375 | goto error; |
| 1376 | } |
| 1377 | sk->sk_sndmsg_off += copy; |
| 1378 | frag->size += copy; |
| 1379 | skb->len += copy; |
| 1380 | skb->data_len += copy; |
Herbert Xu | f945fa7 | 2008-01-22 22:39:26 -0800 | [diff] [blame] | 1381 | skb->truesize += copy; |
| 1382 | atomic_add(copy, &sk->sk_wmem_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | } |
| 1384 | offset += copy; |
| 1385 | length -= copy; |
| 1386 | } |
| 1387 | return 0; |
| 1388 | error: |
| 1389 | inet->cork.length -= length; |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 1390 | IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | return err; |
| 1392 | } |
| 1393 | |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1394 | static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np) |
| 1395 | { |
| 1396 | inet->cork.flags &= ~IPCORK_OPT; |
| 1397 | kfree(np->cork.opt); |
| 1398 | np->cork.opt = NULL; |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1399 | if (inet->cork.dst) { |
| 1400 | dst_release(inet->cork.dst); |
| 1401 | inet->cork.dst = NULL; |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1402 | inet->cork.flags &= ~IPCORK_ALLFRAG; |
| 1403 | } |
| 1404 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); |
| 1405 | } |
| 1406 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | int ip6_push_pending_frames(struct sock *sk) |
| 1408 | { |
| 1409 | struct sk_buff *skb, *tmp_skb; |
| 1410 | struct sk_buff **tail_skb; |
| 1411 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; |
| 1412 | struct inet_sock *inet = inet_sk(sk); |
| 1413 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 1414 | struct ipv6hdr *hdr; |
| 1415 | struct ipv6_txoptions *opt = np->cork.opt; |
YOSHIFUJI Hideaki | c8cdaf9 | 2008-03-10 04:30:37 -0400 | [diff] [blame] | 1416 | struct rt6_info *rt = (struct rt6_info *)inet->cork.dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | struct flowi *fl = &inet->cork.fl; |
| 1418 | unsigned char proto = fl->proto; |
| 1419 | int err = 0; |
| 1420 | |
| 1421 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) |
| 1422 | goto out; |
| 1423 | tail_skb = &(skb_shinfo(skb)->frag_list); |
| 1424 | |
| 1425 | /* move skb->data to ip header from ext header */ |
Arnaldo Carvalho de Melo | d56f90a | 2007-04-10 20:50:43 -0700 | [diff] [blame] | 1426 | if (skb->data < skb_network_header(skb)) |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1427 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1429 | __skb_pull(tmp_skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | *tail_skb = tmp_skb; |
| 1431 | tail_skb = &(tmp_skb->next); |
| 1432 | skb->len += tmp_skb->len; |
| 1433 | skb->data_len += tmp_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | skb->truesize += tmp_skb->truesize; |
| 1435 | __sock_put(tmp_skb->sk); |
| 1436 | tmp_skb->destructor = NULL; |
| 1437 | tmp_skb->sk = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | } |
| 1439 | |
Herbert Xu | 28a8945 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1440 | /* Allow local fragmentation. */ |
Herbert Xu | b5c15fc | 2008-02-14 23:49:37 -0800 | [diff] [blame] | 1441 | if (np->pmtudisc < IPV6_PMTUDISC_DO) |
Herbert Xu | 28a8945 | 2008-02-12 18:07:27 -0800 | [diff] [blame] | 1442 | skb->local_df = 1; |
| 1443 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | ipv6_addr_copy(final_dst, &fl->fl6_dst); |
Arnaldo Carvalho de Melo | cfe1fc7 | 2007-03-16 17:26:39 -0300 | [diff] [blame] | 1445 | __skb_pull(skb, skb_network_header_len(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | if (opt && opt->opt_flen) |
| 1447 | ipv6_push_frag_opts(skb, opt, &proto); |
| 1448 | if (opt && opt->opt_nflen) |
| 1449 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); |
| 1450 | |
Arnaldo Carvalho de Melo | e2d1bca | 2007-04-10 20:46:21 -0700 | [diff] [blame] | 1451 | skb_push(skb, sizeof(struct ipv6hdr)); |
| 1452 | skb_reset_network_header(skb); |
Arnaldo Carvalho de Melo | 0660e03 | 2007-04-25 17:54:47 -0700 | [diff] [blame] | 1453 | hdr = ipv6_hdr(skb); |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 1454 | |
Al Viro | 90bcaf7 | 2006-11-08 00:25:17 -0800 | [diff] [blame] | 1455 | *(__be32*)hdr = fl->fl6_flowlabel | |
YOSHIFUJI Hideaki | 41a1f8e | 2005-09-08 10:19:03 +0900 | [diff] [blame] | 1456 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | hdr->hop_limit = np->cork.hop_limit; |
| 1459 | hdr->nexthdr = proto; |
| 1460 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); |
| 1461 | ipv6_addr_copy(&hdr->daddr, final_dst); |
| 1462 | |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1463 | skb->priority = sk->sk_priority; |
Laszlo Attila Toth | 4a19ec5 | 2008-01-30 19:08:16 -0800 | [diff] [blame] | 1464 | skb->mark = sk->sk_mark; |
Patrick McHardy | a2c2064 | 2006-01-08 22:37:26 -0800 | [diff] [blame] | 1465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | skb->dst = dst_clone(&rt->u.dst); |
YOSHIFUJI Hideaki | a11d206 | 2006-11-04 20:11:37 +0900 | [diff] [blame] | 1467 | IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); |
David L Stevens | 14878f7 | 2007-09-16 16:52:35 -0700 | [diff] [blame] | 1468 | if (proto == IPPROTO_ICMPV6) { |
| 1469 | struct inet6_dev *idev = ip6_dst_idev(skb->dst); |
| 1470 | |
| 1471 | ICMP6MSGOUT_INC_STATS_BH(idev, icmp6_hdr(skb)->icmp6_type); |
| 1472 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS); |
| 1473 | } |
| 1474 | |
Herbert Xu | ef76bc2 | 2008-01-11 19:15:08 -0800 | [diff] [blame] | 1475 | err = ip6_local_out(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | if (err) { |
| 1477 | if (err > 0) |
Herbert Xu | 3320da8 | 2005-04-19 22:32:22 -0700 | [diff] [blame] | 1478 | err = np->recverr ? net_xmit_errno(err) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | if (err) |
| 1480 | goto error; |
| 1481 | } |
| 1482 | |
| 1483 | out: |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1484 | ip6_cork_release(inet, np); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | return err; |
| 1486 | error: |
| 1487 | goto out; |
| 1488 | } |
| 1489 | |
| 1490 | void ip6_flush_pending_frames(struct sock *sk) |
| 1491 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | struct sk_buff *skb; |
| 1493 | |
| 1494 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { |
YOSHIFUJI Hideaki | e1f52208 | 2007-09-11 11:31:43 +0200 | [diff] [blame] | 1495 | if (skb->dst) |
| 1496 | IP6_INC_STATS(ip6_dst_idev(skb->dst), |
| 1497 | IPSTATS_MIB_OUTDISCARDS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | kfree_skb(skb); |
| 1499 | } |
| 1500 | |
Pavel Emelyanov | bf13886 | 2007-11-05 21:04:31 -0800 | [diff] [blame] | 1501 | ip6_cork_release(inet_sk(sk), inet6_sk(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | } |