net/ipv6/ipv6_sockglue.c

   1 /*
   2  *      IPv6 BSD socket options interface
   3  *      Linux INET6 implementation
   4  *
   5  *      Authors:
   6  *      Pedro Roque             <roque@di.fc.ul.pt>
   7  *
   8  *      Based on linux/net/ipv4/ip_sockglue.c
   9  *
  10  *      $Id: ipv6_sockglue.c,v 1.31 2000/01/16 05:11:38 davem Exp $
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  *
  17  *      FIXME: Make the setsockopt code POSIX compliant: That is
  18  *
  19  *      o       Return -EINVAL for setsockopt of short lengths
  20  *      o       Truncate getsockopt returns
  21  *      o       Return an optlen of the truncated length if need be
  22  */
  23
  24 #define __NO_VERSION__
  25 #include <linux/module.h>
  26 #include <linux/config.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/socket.h>
  30 #include <linux/sockios.h>
  31 #include <linux/sched.h>
  32 #include <linux/net.h>
  33 #include <linux/in6.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/init.h>
  37 #include <linux/sysctl.h>
  38
  39 #include <net/sock.h>
  40 #include <net/snmp.h>
  41 #include <net/ipv6.h>
  42 #include <net/ndisc.h>
  43 #include <net/protocol.h>
  44 #include <net/transp_v6.h>
  45 #include <net/ip6_route.h>
  46 #include <net/addrconf.h>
  47 #include <net/inet_common.h>
  48 #include <net/tcp.h>
  49 #include <net/udp.h>
  50
  51 #include <asm/uaccess.h>
  52
  53 struct ipv6_mib ipv6_statistics[NR_CPUS*2];
  54
  55 struct packet_type ipv6_packet_type =
  56 {
  57         __constant_htons(ETH_P_IPV6),
  58         NULL,                                   /* All devices */
  59         ipv6_rcv,
  60         (void*)1,
  61         NULL
  62 };
  63
  64 /*
  65  *      addrconf module should be notifyed of a device going up
  66  */
  67 static struct notifier_block ipv6_dev_notf = {
  68         addrconf_notify,
  69         NULL,
  70         0
  71 };
  72
  73 struct ip6_ra_chain *ip6_ra_chain;
  74 rwlock_t ip6_ra_lock = RW_LOCK_UNLOCKED;
  75
  76 int ip6_ra_control(struct sock *sk, int sel, void (*destructor)(struct sock *))
  77 {
  78         struct ip6_ra_chain *ra, *new_ra, **rap;
  79
  80         /* RA packet may be delivered ONLY to IPPROTO_RAW socket */
  81         if (sk->type != SOCK_RAW || sk->num != IPPROTO_RAW)
  82                 return -EINVAL;
  83
  84         new_ra = (sel>=0) ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
  85
  86         write_lock_bh(&ip6_ra_lock);
  87         for (rap = &ip6_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
  88                 if (ra->sk == sk) {
  89                         if (sel>=0) {
  90                                 write_unlock_bh(&ip6_ra_lock);
  91                                 if (new_ra)
  92                                         kfree(new_ra);
  93                                 return -EADDRINUSE;
  94                         }
  95
  96                         *rap = ra->next;
  97                         write_unlock_bh(&ip6_ra_lock);
  98
  99                         if (ra->destructor)
 100                                 ra->destructor(sk);
 101                         sock_put(sk);
 102                         kfree(ra);
 103                         return 0;
 104                 }
 105         }
 106         if (new_ra == NULL) {
 107                 write_unlock_bh(&ip6_ra_lock);
 108                 return -ENOBUFS;
 109         }
 110         new_ra->sk = sk;
 111         new_ra->sel = sel;
 112         new_ra->destructor = destructor;
 113         new_ra->next = ra;
 114         *rap = new_ra;
 115         sock_hold(sk);
 116         write_unlock_bh(&ip6_ra_lock);
 117         return 0;
 118 }
 119
 120
 121 int ipv6_setsockopt(struct sock *sk, int level, int optname, char *optval,
 122                     int optlen)
 123 {
 124         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 125         int val, valbool;
 126         int retv = -ENOPROTOOPT;
 127
 128         if(level==SOL_IP && sk->type != SOCK_RAW)
 129                 return udp_prot.setsockopt(sk, level, optname, optval, optlen);
 130
 131         if(level!=SOL_IPV6)
 132                 goto out;
 133
 134         if (optval == NULL)
 135                 val=0;
 136         else if (get_user(val, (int *) optval))
 137                 return -EFAULT;
 138
 139         valbool = (val!=0);
 140
 141         lock_sock(sk);
 142
 143         switch (optname) {
 144
 145         case IPV6_ADDRFORM:
 146                 if (val == PF_INET) {
 147                         struct ipv6_txoptions *opt;
 148                         struct sk_buff *pktopt;
 149
 150                         if (sk->protocol != IPPROTO_UDP &&
 151                             sk->protocol != IPPROTO_TCP)
 152                                 break;
 153
 154                         if (sk->state != TCP_ESTABLISHED) {
 155                                 retv = -ENOTCONN;
 156                                 break;
 157                         }
 158
 159                         if (!(ipv6_addr_type(&np->daddr) & IPV6_ADDR_MAPPED)) {
 160                                 retv = -EADDRNOTAVAIL;
 161                                 break;
 162                         }
 163
 164                         fl6_free_socklist(sk);
 165                         ipv6_sock_mc_close(sk);
 166
 167                         if (sk->protocol == IPPROTO_TCP) {
 168                                 struct tcp_opt *tp = &(sk->tp_pinfo.af_tcp);
 169
 170                                 local_bh_disable();
 171                                 sock_prot_dec_use(sk->prot);
 172                                 sock_prot_inc_use(&tcp_prot);
 173                                 local_bh_enable();
 174                                 sk->prot = &tcp_prot;
 175                                 tp->af_specific = &ipv4_specific;
 176                                 sk->socket->ops = &inet_stream_ops;
 177                                 sk->family = PF_INET;
 178                                 tcp_sync_mss(sk, tp->pmtu_cookie);
 179                         } else {
 180                                 local_bh_disable();
 181                                 sock_prot_dec_use(sk->prot);
 182                                 sock_prot_inc_use(&udp_prot);
 183                                 local_bh_enable();
 184                                 sk->prot = &udp_prot;
 185                                 sk->socket->ops = &inet_dgram_ops;
 186                         }
 187                         opt = xchg(&np->opt, NULL);
 188                         if (opt)
 189                                 sock_kfree_s(sk, opt, opt->tot_len);
 190                         pktopt = xchg(&np->pktoptions, NULL);
 191                         if (pktopt)
 192                                 kfree_skb(pktopt);
 193
 194                         sk->destruct = inet_sock_destruct;
 195 #ifdef INET_REFCNT_DEBUG
 196                         atomic_dec(&inet6_sock_nr);
 197 #endif
 198                         MOD_DEC_USE_COUNT;
 199                         retv = 0;
 200                         break;
 201                 }
 202                 goto e_inval;
 203
 204         case IPV6_PKTINFO:
 205                 np->rxopt.bits.rxinfo = valbool;
 206                 retv = 0;
 207                 break;
 208
 209         case IPV6_HOPLIMIT:
 210                 np->rxopt.bits.rxhlim = valbool;
 211                 retv = 0;
 212                 break;
 213
 214         case IPV6_RTHDR:
 215                 if (val < 0 || val > 2)
 216                         goto e_inval;
 217                 np->rxopt.bits.srcrt = val;
 218                 retv = 0;
 219                 break;
 220
 221         case IPV6_HOPOPTS:
 222                 np->rxopt.bits.hopopts = valbool;
 223                 retv = 0;
 224                 break;
 225
 226         case IPV6_AUTHHDR:
 227                 np->rxopt.bits.authhdr = valbool;
 228                 retv = 0;
 229                 break;
 230
 231         case IPV6_DSTOPTS:
 232                 np->rxopt.bits.dstopts = valbool;
 233                 retv = 0;
 234                 break;
 235
 236         case IPV6_FLOWINFO:
 237                 np->rxopt.bits.rxflow = valbool;
 238                 retv = 0;
 239                 break;
 240
 241         case IPV6_PKTOPTIONS:
 242         {
 243                 struct ipv6_txoptions *opt = NULL;
 244                 struct msghdr msg;
 245                 struct flowi fl;
 246                 int junk;
 247
 248                 fl.fl6_flowlabel = 0;
 249                 fl.oif = sk->bound_dev_if;
 250
 251                 if (optlen == 0)
 252                         goto update;
 253
 254                 opt = sock_kmalloc(sk, sizeof(*opt) + optlen, GFP_KERNEL);
 255                 retv = -ENOBUFS;
 256                 if (opt == NULL)
 257                         break;
 258
 259                 memset(opt, 0, sizeof(*opt));
 260                 opt->tot_len = sizeof(*opt) + optlen;
 261                 retv = -EFAULT;
 262                 if (copy_from_user(opt+1, optval, optlen))
 263                         goto done;
 264
 265                 msg.msg_controllen = optlen;
 266                 msg.msg_control = (void*)(opt+1);
 267
 268                 retv = datagram_send_ctl(&msg, &fl, opt, &junk);
 269                 if (retv)
 270                         goto done;
 271 update:
 272                 retv = 0;
 273                 if (sk->type == SOCK_STREAM) {
 274                         if (opt) {
 275                                 struct tcp_opt *tp = &sk->tp_pinfo.af_tcp;
 276                                 if (!((1<<sk->state)&(TCPF_LISTEN|TCPF_CLOSE))
 277                                     && sk->daddr != LOOPBACK4_IPV6) {
 278                                         tp->ext_header_len = opt->opt_flen + opt->opt_nflen;
 279                                         tcp_sync_mss(sk, tp->pmtu_cookie);
 280                                 }
 281                         }
 282                         opt = xchg(&np->opt, opt);
 283                         sk_dst_reset(sk);
 284                 } else {
 285                         write_lock(&sk->dst_lock);
 286                         opt = xchg(&np->opt, opt);
 287                         write_unlock(&sk->dst_lock);
 288                         sk_dst_reset(sk);
 289                 }
 290
 291 done:
 292                 if (opt)
 293                         sock_kfree_s(sk, opt, opt->tot_len);
 294                 break;
 295         }
 296         case IPV6_UNICAST_HOPS:
 297                 if (val > 255 || val < -1)
 298                         goto e_inval;
 299                 np->hop_limit = val;
 300                 retv = 0;
 301                 break;
 302
 303         case IPV6_MULTICAST_HOPS:
 304                 if (sk->type == SOCK_STREAM)
 305                         goto e_inval;
 306                 if (val > 255 || val < -1)
 307                         goto e_inval;
 308                 np->mcast_hops = val;
 309                 retv = 0;
 310                 break;
 311
 312         case IPV6_MULTICAST_LOOP:
 313                 np->mc_loop = valbool;
 314                 retv = 0;
 315                 break;
 316
 317         case IPV6_MULTICAST_IF:
 318                 if (sk->type == SOCK_STREAM)
 319                         goto e_inval;
 320                 if (sk->bound_dev_if && sk->bound_dev_if != val)
 321                         goto e_inval;
 322
 323                 if (__dev_get_by_index(val) == NULL) {
 324                         retv = -ENODEV;
 325                         break;
 326                 }
 327                 np->mcast_oif = val;
 328                 retv = 0;
 329                 break;
 330         case IPV6_ADD_MEMBERSHIP:
 331         case IPV6_DROP_MEMBERSHIP:
 332         {
 333                 struct ipv6_mreq mreq;
 334
 335                 retv = -EFAULT;
 336                 if (copy_from_user(&mreq, optval, sizeof(struct ipv6_mreq)))
 337                         break;
 338
 339                 if (optname == IPV6_ADD_MEMBERSHIP)
 340                         retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 341                 else
 342                         retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
 343                 break;
 344         }
 345         case IPV6_ROUTER_ALERT:
 346                 retv = ip6_ra_control(sk, val, NULL);
 347                 break;
 348         case IPV6_MTU_DISCOVER:
 349                 if (val<0 || val>2)
 350                         goto e_inval;
 351                 np->pmtudisc = val;
 352                 retv = 0;
 353                 break;
 354         case IPV6_MTU:
 355                 if (val && val < IPV6_MIN_MTU)
 356                         goto e_inval;
 357                 np->frag_size = val;
 358                 retv = 0;
 359                 break;
 360         case IPV6_RECVERR:
 361                 np->recverr = valbool;
 362                 if (!val)
 363                         skb_queue_purge(&sk->error_queue);
 364                 retv = 0;
 365                 break;
 366         case IPV6_FLOWINFO_SEND:
 367                 np->sndflow = valbool;
 368                 retv = 0;
 369                 break;
 370         case IPV6_FLOWLABEL_MGR:
 371                 retv = ipv6_flowlabel_opt(sk, optval, optlen);
 372                 break;
 373         }
 374         release_sock(sk);
 375
 376 out:
 377         return retv;
 378
 379 e_inval:
 380         release_sock(sk);
 381         return -EINVAL;
 382 }
 383
 384 int ipv6_getsockopt(struct sock *sk, int level, int optname, char *optval,
 385                     int *optlen)
 386 {
 387         struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
 388         int len;
 389         int val;
 390
 391         if(level==SOL_IP && sk->type != SOCK_RAW)
 392                 return udp_prot.getsockopt(sk, level, optname, optval, optlen);
 393         if(level!=SOL_IPV6)
 394                 return -ENOPROTOOPT;
 395         if (get_user(len, optlen))
 396                 return -EFAULT;
 397         switch (optname) {
 398         case IPV6_PKTOPTIONS:
 399         {
 400                 struct msghdr msg;
 401                 struct sk_buff *skb;
 402
 403                 if (sk->type != SOCK_STREAM)
 404                         return -ENOPROTOOPT;
 405
 406                 msg.msg_control = optval;
 407                 msg.msg_controllen = len;
 408                 msg.msg_flags = 0;
 409
 410                 lock_sock(sk);
 411                 skb = np->pktoptions;
 412                 if (skb)
 413                         atomic_inc(&skb->users);
 414                 release_sock(sk);
 415
 416                 if (skb) {
 417                         int err = datagram_recv_ctl(sk, &msg, skb);
 418                         kfree_skb(skb);
 419                         if (err)
 420                                 return err;
 421                 } else {
 422                         if (np->rxopt.bits.rxinfo) {
 423                                 struct in6_pktinfo src_info;
 424                                 src_info.ipi6_ifindex = np->mcast_oif;
 425                                 ipv6_addr_copy(&src_info.ipi6_addr, &np->daddr);
 426                                 put_cmsg(&msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
 427                         }
 428                         if (np->rxopt.bits.rxhlim) {
 429                                 int hlim = np->mcast_hops;
 430                                 put_cmsg(&msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
 431                         }
 432                 }
 433                 len -= msg.msg_controllen;
 434                 return put_user(len, optlen);
 435         }
 436         case IP_MTU:
 437         {
 438                 struct dst_entry *dst;
 439                 val = 0;
 440                 lock_sock(sk);
 441                 dst = sk_dst_get(sk);
 442                 if (dst) {
 443                         val = dst->pmtu;
 444                         dst_release(dst);
 445                 }
 446                 release_sock(sk);
 447                 if (!val)
 448                         return -ENOTCONN;
 449                 break;
 450         }
 451         default:
 452                 return -EINVAL;
 453         }
 454         len=min(sizeof(int),len);
 455         if(put_user(len, optlen))
 456                 return -EFAULT;
 457         if(copy_to_user(optval,&val,len))
 458                 return -EFAULT;
 459         return 0;
 460 }
 461
 462 #if defined(MODULE) && defined(CONFIG_SYSCTL)
 463
 464 /*
 465  *      sysctl registration functions defined in sysctl_net_ipv6.c
 466  */
 467
 468 extern void ipv6_sysctl_register(void);
 469 extern void ipv6_sysctl_unregister(void);
 470 #endif
 471
 472 void __init ipv6_packet_init(void)
 473 {
 474         dev_add_pack(&ipv6_packet_type);
 475 }
 476
 477 void __init ipv6_netdev_notif_init(void)
 478 {
 479         register_netdevice_notifier(&ipv6_dev_notf);
 480 }
 481
 482 #ifdef MODULE
 483 void ipv6_packet_cleanup(void)
 484 {
 485         dev_remove_pack(&ipv6_packet_type);
 486 }
 487
 488 void ipv6_netdev_notif_cleanup(void)
 489 {
 490         unregister_netdevice_notifier(&ipv6_dev_notf);
 491 }
 492 #endif