include/net/ip.h

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Definitions for the IP module.
   7  *
   8  * Version:     @(#)ip.h        1.0.2   05/07/93
   9  *
  10  * Authors:     Ross Biro
  11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
  13  *
  14  * Changes:
  15  *              Mike McLagan    :       Routing by source
  16  *
  17  *              This program is free software; you can redistribute it and/or
  18  *              modify it under the terms of the GNU General Public License
  19  *              as published by the Free Software Foundation; either version
  20  *              2 of the License, or (at your option) any later version.
  21  */
  22 #ifndef _IP_H
  23 #define _IP_H
  24
  25 #include <linux/types.h>
  26 #include <linux/ip.h>
  27 #include <linux/in.h>
  28 #include <linux/skbuff.h>
  29
  30 #include <net/inet_sock.h>
  31 #include <net/route.h>
  32 #include <net/snmp.h>
  33 #include <net/flow.h>
  34 #include <net/flow_keys.h>
  35
  36 struct sock;
  37
  38 struct inet_skb_parm {
  39         struct ip_options       opt;            /* Compiled IP options          */
  40         unsigned char           flags;
  41
  42 #define IPSKB_FORWARDED         BIT(0)
  43 #define IPSKB_XFRM_TUNNEL_SIZE  BIT(1)
  44 #define IPSKB_XFRM_TRANSFORMED  BIT(2)
  45 #define IPSKB_FRAG_COMPLETE     BIT(3)
  46 #define IPSKB_REROUTED          BIT(4)
  47 #define IPSKB_DOREDIRECT        BIT(5)
  48
  49         u16                     frag_max_size;
  50 };
  51
  52 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
  53 {
  54         return ip_hdr(skb)->ihl * 4;
  55 }
  56
  57 struct ipcm_cookie {
  58         __be32                  addr;
  59         int                     oif;
  60         struct ip_options_rcu   *opt;
  61         __u8                    tx_flags;
  62         __u8                    ttl;
  63         __s16                   tos;
  64         char                    priority;
  65 };
  66
  67 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
  68 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
  69
  70 struct ip_ra_chain {
  71         struct ip_ra_chain __rcu *next;
  72         struct sock             *sk;
  73         union {
  74                 void                    (*destructor)(struct sock *);
  75                 struct sock             *saved_sk;
  76         };
  77         struct rcu_head         rcu;
  78 };
  79
  80 extern struct ip_ra_chain __rcu *ip_ra_chain;
  81
  82 /* IP flags. */
  83 #define IP_CE           0x8000          /* Flag: "Congestion"           */
  84 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
  85 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
  86 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
  87
  88 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
  89
  90 struct msghdr;
  91 struct net_device;
  92 struct packet_type;
  93 struct rtable;
  94 struct sockaddr;
  95
  96 int igmp_mc_init(void);
  97
  98 /*
  99  *      Functions provided by ip.c
 100  */
 101
 102 int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
 103                           __be32 saddr, __be32 daddr,
 104                           struct ip_options_rcu *opt);
 105 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
 106            struct net_device *orig_dev);
 107 int ip_local_deliver(struct sk_buff *skb);
 108 int ip_mr_input(struct sk_buff *skb);
 109 int ip_output(struct sock *sk, struct sk_buff *skb);
 110 int ip_mc_output(struct sock *sk, struct sk_buff *skb);
 111 int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 112 int ip_do_nat(struct sk_buff *skb);
 113 void ip_send_check(struct iphdr *ip);
 114 int __ip_local_out(struct sk_buff *skb);
 115 int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
 116 static inline int ip_local_out(struct sk_buff *skb)
 117 {
 118         return ip_local_out_sk(skb->sk, skb);
 119 }
 120
 121 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
 122 void ip_init(void);
 123 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
 124                    int getfrag(void *from, char *to, int offset, int len,
 125                                int odd, struct sk_buff *skb),
 126                    void *from, int len, int protolen,
 127                    struct ipcm_cookie *ipc,
 128                    struct rtable **rt,
 129                    unsigned int flags);
 130 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
 131                        struct sk_buff *skb);
 132 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
 133                        int offset, size_t size, int flags);
 134 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
 135                               struct sk_buff_head *queue,
 136                               struct inet_cork *cork);
 137 int ip_send_skb(struct net *net, struct sk_buff *skb);
 138 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
 139 void ip_flush_pending_frames(struct sock *sk);
 140 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
 141                             int getfrag(void *from, char *to, int offset,
 142                                         int len, int odd, struct sk_buff *skb),
 143                             void *from, int length, int transhdrlen,
 144                             struct ipcm_cookie *ipc, struct rtable **rtp,
 145                             unsigned int flags);
 146
 147 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
 148 {
 149         return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
 150 }
 151
 152 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
 153 {
 154         return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
 155 }
 156
 157 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
 158 {
 159         return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
 160 }
 161
 162 /* datagram.c */
 163 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
 164
 165 void ip4_datagram_release_cb(struct sock *sk);
 166
 167 struct ip_reply_arg {
 168         struct kvec iov[1];
 169         int         flags;
 170         __wsum      csum;
 171         int         csumoffset; /* u16 offset of csum in iov[0].iov_base */
 172                                 /* -1 if not needed */
 173         int         bound_dev_if;
 174         u8          tos;
 175 };
 176
 177 #define IP_REPLY_ARG_NOSRCCHECK 1
 178
 179 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
 180 {
 181         return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
 182 }
 183
 184 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
 185                            const struct ip_options *sopt,
 186                            __be32 daddr, __be32 saddr,
 187                            const struct ip_reply_arg *arg,
 188                            unsigned int len);
 189
 190 #define IP_INC_STATS(net, field)        SNMP_INC_STATS64((net)->mib.ip_statistics, field)
 191 #define IP_INC_STATS_BH(net, field)     SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
 192 #define IP_ADD_STATS(net, field, val)   SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
 193 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
 194 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
 195 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
 196 #define NET_INC_STATS(net, field)       SNMP_INC_STATS((net)->mib.net_statistics, field)
 197 #define NET_INC_STATS_BH(net, field)    SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
 198 #define NET_INC_STATS_USER(net, field)  SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
 199 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
 200 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
 201 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
 202
 203 unsigned long snmp_fold_field(void __percpu *mib, int offt);
 204 #if BITS_PER_LONG==32
 205 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
 206 #else
 207 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
 208 {
 209         return snmp_fold_field(mib, offt);
 210 }
 211 #endif
 212
 213 void inet_get_local_port_range(struct net *net, int *low, int *high);
 214
 215 #ifdef CONFIG_SYSCTL
 216 static inline int inet_is_local_reserved_port(struct net *net, int port)
 217 {
 218         if (!net->ipv4.sysctl_local_reserved_ports)
 219                 return 0;
 220         return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
 221 }
 222
 223 static inline bool sysctl_dev_name_is_allowed(const char *name)
 224 {
 225         return strcmp(name, "default") != 0  && strcmp(name, "all") != 0;
 226 }
 227
 228 #else
 229 static inline int inet_is_local_reserved_port(struct net *net, int port)
 230 {
 231         return 0;
 232 }
 233 #endif
 234
 235 /* From inetpeer.c */
 236 extern int inet_peer_threshold;
 237 extern int inet_peer_minttl;
 238 extern int inet_peer_maxttl;
 239
 240 /* From ip_input.c */
 241 extern int sysctl_ip_early_demux;
 242
 243 /* From ip_output.c */
 244 extern int sysctl_ip_dynaddr;
 245
 246 void ipfrag_init(void);
 247
 248 void ip_static_sysctl_init(void);
 249
 250 #define IP4_REPLY_MARK(net, mark) \
 251         ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
 252
 253 static inline bool ip_is_fragment(const struct iphdr *iph)
 254 {
 255         return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
 256 }
 257
 258 #ifdef CONFIG_INET
 259 #include <net/dst.h>
 260
 261 /* The function in 2.2 was invalid, producing wrong result for
 262  * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
 263 static inline
 264 int ip_decrease_ttl(struct iphdr *iph)
 265 {
 266         u32 check = (__force u32)iph->check;
 267         check += (__force u32)htons(0x0100);
 268         iph->check = (__force __sum16)(check + (check>=0xFFFF));
 269         return --iph->ttl;
 270 }
 271
 272 static inline
 273 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
 274 {
 275         return  inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
 276                 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
 277                  !(dst_metric_locked(dst, RTAX_MTU)));
 278 }
 279
 280 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
 281 {
 282         return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
 283                inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
 284 }
 285
 286 static inline bool ip_sk_use_pmtu(const struct sock *sk)
 287 {
 288         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
 289 }
 290
 291 static inline bool ip_sk_ignore_df(const struct sock *sk)
 292 {
 293         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
 294                inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
 295 }
 296
 297 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
 298                                                     bool forwarding)
 299 {
 300         struct net *net = dev_net(dst->dev);
 301
 302         if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
 303             dst_metric_locked(dst, RTAX_MTU) ||
 304             !forwarding)
 305                 return dst_mtu(dst);
 306
 307         return min(dst->dev->mtu, IP_MAX_MTU);
 308 }
 309
 310 static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
 311 {
 312         if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
 313                 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
 314                 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
 315         } else {
 316                 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
 317         }
 318 }
 319
 320 u32 ip_idents_reserve(u32 hash, int segs);
 321 void __ip_select_ident(struct iphdr *iph, int segs);
 322
 323 static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
 324 {
 325         struct iphdr *iph = ip_hdr(skb);
 326
 327         if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
 328                 /* This is only to work around buggy Windows95/2000
 329                  * VJ compression implementations.  If the ID field
 330                  * does not change, they drop every other packet in
 331                  * a TCP stream using header compression.
 332                  */
 333                 if (sk && inet_sk(sk)->inet_daddr) {
 334                         iph->id = htons(inet_sk(sk)->inet_id);
 335                         inet_sk(sk)->inet_id += segs;
 336                 } else {
 337                         iph->id = 0;
 338                 }
 339         } else {
 340                 __ip_select_ident(iph, segs);
 341         }
 342 }
 343
 344 static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
 345 {
 346         ip_select_ident_segs(skb, sk, 1);
 347 }
 348
 349 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
 350 {
 351         return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
 352                                   skb->len, proto, 0);
 353 }
 354
 355 static inline void inet_set_txhash(struct sock *sk)
 356 {
 357         struct inet_sock *inet = inet_sk(sk);
 358         struct flow_keys keys;
 359
 360         keys.src = inet->inet_saddr;
 361         keys.dst = inet->inet_daddr;
 362         keys.port16[0] = inet->inet_sport;
 363         keys.port16[1] = inet->inet_dport;
 364
 365         sk->sk_txhash = flow_hash_from_keys(&keys);
 366 }
 367
 368 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
 369 {
 370         const struct iphdr *iph = skb_gro_network_header(skb);
 371
 372         return csum_tcpudp_nofold(iph->saddr, iph->daddr,
 373                                   skb_gro_len(skb), proto, 0);
 374 }
 375
 376 /*
 377  *      Map a multicast IP onto multicast MAC for type ethernet.
 378  */
 379
 380 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
 381 {
 382         __u32 addr=ntohl(naddr);
 383         buf[0]=0x01;
 384         buf[1]=0x00;
 385         buf[2]=0x5e;
 386         buf[5]=addr&0xFF;
 387         addr>>=8;
 388         buf[4]=addr&0xFF;
 389         addr>>=8;
 390         buf[3]=addr&0x7F;
 391 }
 392
 393 /*
 394  *      Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
 395  *      Leave P_Key as 0 to be filled in by driver.
 396  */
 397
 398 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
 399 {
 400         __u32 addr;
 401         unsigned char scope = broadcast[5] & 0xF;
 402
 403         buf[0]  = 0;            /* Reserved */
 404         buf[1]  = 0xff;         /* Multicast QPN */
 405         buf[2]  = 0xff;
 406         buf[3]  = 0xff;
 407         addr    = ntohl(naddr);
 408         buf[4]  = 0xff;
 409         buf[5]  = 0x10 | scope; /* scope from broadcast address */
 410         buf[6]  = 0x40;         /* IPv4 signature */
 411         buf[7]  = 0x1b;
 412         buf[8]  = broadcast[8];         /* P_Key */
 413         buf[9]  = broadcast[9];
 414         buf[10] = 0;
 415         buf[11] = 0;
 416         buf[12] = 0;
 417         buf[13] = 0;
 418         buf[14] = 0;
 419         buf[15] = 0;
 420         buf[19] = addr & 0xff;
 421         addr  >>= 8;
 422         buf[18] = addr & 0xff;
 423         addr  >>= 8;
 424         buf[17] = addr & 0xff;
 425         addr  >>= 8;
 426         buf[16] = addr & 0x0f;
 427 }
 428
 429 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
 430 {
 431         if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
 432                 memcpy(buf, broadcast, 4);
 433         else
 434                 memcpy(buf, &naddr, sizeof(naddr));
 435 }
 436
 437 #if IS_ENABLED(CONFIG_IPV6)
 438 #include <linux/ipv6.h>
 439 #endif
 440
 441 static __inline__ void inet_reset_saddr(struct sock *sk)
 442 {
 443         inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
 444 #if IS_ENABLED(CONFIG_IPV6)
 445         if (sk->sk_family == PF_INET6) {
 446                 struct ipv6_pinfo *np = inet6_sk(sk);
 447
 448                 memset(&np->saddr, 0, sizeof(np->saddr));
 449                 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
 450         }
 451 #endif
 452 }
 453
 454 #endif
 455
 456 bool ip_call_ra_chain(struct sk_buff *skb);
 457
 458 /*
 459  *      Functions provided by ip_fragment.c
 460  */
 461
 462 enum ip_defrag_users {
 463         IP_DEFRAG_LOCAL_DELIVER,
 464         IP_DEFRAG_CALL_RA_CHAIN,
 465         IP_DEFRAG_CONNTRACK_IN,
 466         __IP_DEFRAG_CONNTRACK_IN_END    = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
 467         IP_DEFRAG_CONNTRACK_OUT,
 468         __IP_DEFRAG_CONNTRACK_OUT_END   = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
 469         IP_DEFRAG_CONNTRACK_BRIDGE_IN,
 470         __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
 471         IP_DEFRAG_VS_IN,
 472         IP_DEFRAG_VS_OUT,
 473         IP_DEFRAG_VS_FWD,
 474         IP_DEFRAG_AF_PACKET,
 475         IP_DEFRAG_MACVLAN,
 476 };
 477
 478 int ip_defrag(struct sk_buff *skb, u32 user);
 479 #ifdef CONFIG_INET
 480 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
 481 #else
 482 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
 483 {
 484         return skb;
 485 }
 486 #endif
 487 int ip_frag_mem(struct net *net);
 488
 489 /*
 490  *      Functions provided by ip_forward.c
 491  */
 492
 493 int ip_forward(struct sk_buff *skb);
 494
 495 /*
 496  *      Functions provided by ip_options.c
 497  */
 498
 499 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
 500                       __be32 daddr, struct rtable *rt, int is_frag);
 501
 502 int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
 503                       const struct ip_options *sopt);
 504 static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
 505 {
 506         return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
 507 }
 508
 509 void ip_options_fragment(struct sk_buff *skb);
 510 int ip_options_compile(struct net *net, struct ip_options *opt,
 511                        struct sk_buff *skb);
 512 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
 513                    unsigned char *data, int optlen);
 514 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
 515                              unsigned char __user *data, int optlen);
 516 void ip_options_undo(struct ip_options *opt);
 517 void ip_forward_options(struct sk_buff *skb);
 518 int ip_options_rcv_srr(struct sk_buff *skb);
 519
 520 /*
 521  *      Functions provided by ip_sockglue.c
 522  */
 523
 524 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
 525 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset);
 526 int ip_cmsg_send(struct net *net, struct msghdr *msg,
 527                  struct ipcm_cookie *ipc, bool allow_ipv6);
 528 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
 529                   unsigned int optlen);
 530 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
 531                   int __user *optlen);
 532 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
 533                          char __user *optval, unsigned int optlen);
 534 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
 535                          char __user *optval, int __user *optlen);
 536 int ip_ra_control(struct sock *sk, unsigned char on,
 537                   void (*destructor)(struct sock *));
 538
 539 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
 540 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
 541                    u32 info, u8 *payload);
 542 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
 543                     u32 info);
 544
 545 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 546 {
 547         ip_cmsg_recv_offset(msg, skb, 0);
 548 }
 549
 550 bool icmp_global_allow(void);
 551 extern int sysctl_icmp_msgs_per_sec;
 552 extern int sysctl_icmp_msgs_burst;
 553
 554 #ifdef CONFIG_PROC_FS
 555 int ip_misc_proc_init(void);
 556 #endif
 557
 558 #endif  /* _IP_H */