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TOMOYO Linux Cross Reference
Linux/include/net/ip.h

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  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 #include <linux/jhash.h>
 30 
 31 #include <net/inet_sock.h>
 32 #include <net/route.h>
 33 #include <net/snmp.h>
 34 #include <net/flow.h>
 35 #include <net/flow_dissector.h>
 36 #include <net/netns/hash.h>
 37 
 38 #define IPV4_MAX_PMTU           65535U          /* RFC 2675, Section 5.1 */
 39 #define IPV4_MIN_MTU            68                      /* RFC 791 */
 40 
 41 struct sock;
 42 
 43 struct inet_skb_parm {
 44         int                     iif;
 45         struct ip_options       opt;            /* Compiled IP options          */
 46         u16                     flags;
 47 
 48 #define IPSKB_FORWARDED         BIT(0)
 49 #define IPSKB_XFRM_TUNNEL_SIZE  BIT(1)
 50 #define IPSKB_XFRM_TRANSFORMED  BIT(2)
 51 #define IPSKB_FRAG_COMPLETE     BIT(3)
 52 #define IPSKB_REROUTED          BIT(4)
 53 #define IPSKB_DOREDIRECT        BIT(5)
 54 #define IPSKB_FRAG_PMTU         BIT(6)
 55 #define IPSKB_L3SLAVE           BIT(7)
 56 
 57         u16                     frag_max_size;
 58 };
 59 
 60 static inline bool ipv4_l3mdev_skb(u16 flags)
 61 {
 62         return !!(flags & IPSKB_L3SLAVE);
 63 }
 64 
 65 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
 66 {
 67         return ip_hdr(skb)->ihl * 4;
 68 }
 69 
 70 struct ipcm_cookie {
 71         struct sockcm_cookie    sockc;
 72         __be32                  addr;
 73         int                     oif;
 74         struct ip_options_rcu   *opt;
 75         __u8                    tx_flags;
 76         __u8                    ttl;
 77         __s16                   tos;
 78         char                    priority;
 79 };
 80 
 81 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
 82 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
 83 
 84 /* return enslaved device index if relevant */
 85 static inline int inet_sdif(struct sk_buff *skb)
 86 {
 87 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
 88         if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
 89                 return IPCB(skb)->iif;
 90 #endif
 91         return 0;
 92 }
 93 
 94 struct ip_ra_chain {
 95         struct ip_ra_chain __rcu *next;
 96         struct sock             *sk;
 97         union {
 98                 void                    (*destructor)(struct sock *);
 99                 struct sock             *saved_sk;
100         };
101         struct rcu_head         rcu;
102 };
103 
104 extern struct ip_ra_chain __rcu *ip_ra_chain;
105 
106 /* IP flags. */
107 #define IP_CE           0x8000          /* Flag: "Congestion"           */
108 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
109 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
110 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
111 
112 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
113 
114 struct msghdr;
115 struct net_device;
116 struct packet_type;
117 struct rtable;
118 struct sockaddr;
119 
120 int igmp_mc_init(void);
121 
122 /*
123  *      Functions provided by ip.c
124  */
125 
126 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
127                           __be32 saddr, __be32 daddr,
128                           struct ip_options_rcu *opt);
129 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
130            struct net_device *orig_dev);
131 int ip_local_deliver(struct sk_buff *skb);
132 int ip_mr_input(struct sk_buff *skb);
133 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
134 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
135 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
136                    int (*output)(struct net *, struct sock *, struct sk_buff *));
137 void ip_send_check(struct iphdr *ip);
138 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
139 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
140 
141 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
142 void ip_init(void);
143 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
144                    int getfrag(void *from, char *to, int offset, int len,
145                                int odd, struct sk_buff *skb),
146                    void *from, int len, int protolen,
147                    struct ipcm_cookie *ipc,
148                    struct rtable **rt,
149                    unsigned int flags);
150 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
151                        struct sk_buff *skb);
152 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
153                        int offset, size_t size, int flags);
154 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
155                               struct sk_buff_head *queue,
156                               struct inet_cork *cork);
157 int ip_send_skb(struct net *net, struct sk_buff *skb);
158 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
159 void ip_flush_pending_frames(struct sock *sk);
160 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
161                             int getfrag(void *from, char *to, int offset,
162                                         int len, int odd, struct sk_buff *skb),
163                             void *from, int length, int transhdrlen,
164                             struct ipcm_cookie *ipc, struct rtable **rtp,
165                             unsigned int flags);
166 
167 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
168 {
169         return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
170 }
171 
172 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
173 {
174         return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
175 }
176 
177 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
178 {
179         return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
180 }
181 
182 /* datagram.c */
183 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
184 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
185 
186 void ip4_datagram_release_cb(struct sock *sk);
187 
188 struct ip_reply_arg {
189         struct kvec iov[1];   
190         int         flags;
191         __wsum      csum;
192         int         csumoffset; /* u16 offset of csum in iov[0].iov_base */
193                                 /* -1 if not needed */ 
194         int         bound_dev_if;
195         u8          tos;
196         kuid_t      uid;
197 }; 
198 
199 #define IP_REPLY_ARG_NOSRCCHECK 1
200 
201 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
202 {
203         return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
204 }
205 
206 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
207                            const struct ip_options *sopt,
208                            __be32 daddr, __be32 saddr,
209                            const struct ip_reply_arg *arg,
210                            unsigned int len);
211 
212 #define IP_INC_STATS(net, field)        SNMP_INC_STATS64((net)->mib.ip_statistics, field)
213 #define __IP_INC_STATS(net, field)      __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
214 #define IP_ADD_STATS(net, field, val)   SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
215 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
216 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
217 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
218 #define NET_INC_STATS(net, field)       SNMP_INC_STATS((net)->mib.net_statistics, field)
219 #define __NET_INC_STATS(net, field)     __SNMP_INC_STATS((net)->mib.net_statistics, field)
220 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
221 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
222 
223 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
224 unsigned long snmp_fold_field(void __percpu *mib, int offt);
225 #if BITS_PER_LONG==32
226 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
227                          size_t syncp_offset);
228 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
229 #else
230 static inline u64  snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
231                                         size_t syncp_offset)
232 {
233         return snmp_get_cpu_field(mib, cpu, offct);
234 
235 }
236 
237 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
238 {
239         return snmp_fold_field(mib, offt);
240 }
241 #endif
242 
243 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
244 { \
245         int i, c; \
246         for_each_possible_cpu(c) { \
247                 for (i = 0; stats_list[i].name; i++) \
248                         buff64[i] += snmp_get_cpu_field64( \
249                                         mib_statistic, \
250                                         c, stats_list[i].entry, \
251                                         offset); \
252         } \
253 }
254 
255 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
256 { \
257         int i, c; \
258         for_each_possible_cpu(c) { \
259                 for (i = 0; stats_list[i].name; i++) \
260                         buff[i] += snmp_get_cpu_field( \
261                                                 mib_statistic, \
262                                                 c, stats_list[i].entry); \
263         } \
264 }
265 
266 void inet_get_local_port_range(struct net *net, int *low, int *high);
267 
268 #ifdef CONFIG_SYSCTL
269 static inline int inet_is_local_reserved_port(struct net *net, int port)
270 {
271         if (ccs_lport_reserved(port))
272                 return 1;
273         if (!net->ipv4.sysctl_local_reserved_ports)
274                 return 0;
275         return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
276 }
277 
278 static inline bool sysctl_dev_name_is_allowed(const char *name)
279 {
280         return strcmp(name, "default") != 0  && strcmp(name, "all") != 0;
281 }
282 
283 static inline int inet_prot_sock(struct net *net)
284 {
285         return net->ipv4.sysctl_ip_prot_sock;
286 }
287 
288 #else
289 static inline int inet_is_local_reserved_port(struct net *net, int port)
290 {
291         if (ccs_lport_reserved(port))
292                 return 1;
293         return 0;
294 }
295 
296 static inline int inet_prot_sock(struct net *net)
297 {
298         return PROT_SOCK;
299 }
300 #endif
301 
302 __be32 inet_current_timestamp(void);
303 
304 /* From inetpeer.c */
305 extern int inet_peer_threshold;
306 extern int inet_peer_minttl;
307 extern int inet_peer_maxttl;
308 
309 void ipfrag_init(void);
310 
311 void ip_static_sysctl_init(void);
312 
313 #define IP4_REPLY_MARK(net, mark) \
314         ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
315 
316 static inline bool ip_is_fragment(const struct iphdr *iph)
317 {
318         return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
319 }
320 
321 #ifdef CONFIG_INET
322 #include <net/dst.h>
323 
324 /* The function in 2.2 was invalid, producing wrong result for
325  * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
326 static inline
327 int ip_decrease_ttl(struct iphdr *iph)
328 {
329         u32 check = (__force u32)iph->check;
330         check += (__force u32)htons(0x0100);
331         iph->check = (__force __sum16)(check + (check>=0xFFFF));
332         return --iph->ttl;
333 }
334 
335 static inline int ip_mtu_locked(const struct dst_entry *dst)
336 {
337         const struct rtable *rt = (const struct rtable *)dst;
338 
339         return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
340 }
341 
342 static inline
343 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
344 {
345         u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
346 
347         return  pmtudisc == IP_PMTUDISC_DO ||
348                 (pmtudisc == IP_PMTUDISC_WANT &&
349                  !ip_mtu_locked(dst));
350 }
351 
352 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
353 {
354         return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
355                inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
356 }
357 
358 static inline bool ip_sk_use_pmtu(const struct sock *sk)
359 {
360         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
361 }
362 
363 static inline bool ip_sk_ignore_df(const struct sock *sk)
364 {
365         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
366                inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
367 }
368 
369 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
370                                                     bool forwarding)
371 {
372         struct net *net = dev_net(dst->dev);
373 
374         if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
375             ip_mtu_locked(dst) ||
376             !forwarding)
377                 return dst_mtu(dst);
378 
379         return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
380 }
381 
382 static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
383                                           const struct sk_buff *skb)
384 {
385         if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
386                 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
387 
388                 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
389         }
390 
391         return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
392 }
393 
394 u32 ip_idents_reserve(u32 hash, int segs);
395 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
396 
397 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
398                                         struct sock *sk, int segs)
399 {
400         struct iphdr *iph = ip_hdr(skb);
401 
402         if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
403                 /* This is only to work around buggy Windows95/2000
404                  * VJ compression implementations.  If the ID field
405                  * does not change, they drop every other packet in
406                  * a TCP stream using header compression.
407                  */
408                 if (sk && inet_sk(sk)->inet_daddr) {
409                         iph->id = htons(inet_sk(sk)->inet_id);
410                         inet_sk(sk)->inet_id += segs;
411                 } else {
412                         iph->id = 0;
413                 }
414         } else {
415                 __ip_select_ident(net, iph, segs);
416         }
417 }
418 
419 static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
420                                    struct sock *sk)
421 {
422         ip_select_ident_segs(net, skb, sk, 1);
423 }
424 
425 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
426 {
427         return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
428                                   skb->len, proto, 0);
429 }
430 
431 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
432  * Equivalent to :      flow->v4addrs.src = iph->saddr;
433  *                      flow->v4addrs.dst = iph->daddr;
434  */
435 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
436                                             const struct iphdr *iph)
437 {
438         BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
439                      offsetof(typeof(flow->addrs), v4addrs.src) +
440                               sizeof(flow->addrs.v4addrs.src));
441         memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
442         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
443 }
444 
445 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
446 {
447         const struct iphdr *iph = skb_gro_network_header(skb);
448 
449         return csum_tcpudp_nofold(iph->saddr, iph->daddr,
450                                   skb_gro_len(skb), proto, 0);
451 }
452 
453 /*
454  *      Map a multicast IP onto multicast MAC for type ethernet.
455  */
456 
457 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
458 {
459         __u32 addr=ntohl(naddr);
460         buf[0]=0x01;
461         buf[1]=0x00;
462         buf[2]=0x5e;
463         buf[5]=addr&0xFF;
464         addr>>=8;
465         buf[4]=addr&0xFF;
466         addr>>=8;
467         buf[3]=addr&0x7F;
468 }
469 
470 /*
471  *      Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
472  *      Leave P_Key as 0 to be filled in by driver.
473  */
474 
475 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
476 {
477         __u32 addr;
478         unsigned char scope = broadcast[5] & 0xF;
479 
480         buf[0]  = 0;            /* Reserved */
481         buf[1]  = 0xff;         /* Multicast QPN */
482         buf[2]  = 0xff;
483         buf[3]  = 0xff;
484         addr    = ntohl(naddr);
485         buf[4]  = 0xff;
486         buf[5]  = 0x10 | scope; /* scope from broadcast address */
487         buf[6]  = 0x40;         /* IPv4 signature */
488         buf[7]  = 0x1b;
489         buf[8]  = broadcast[8];         /* P_Key */
490         buf[9]  = broadcast[9];
491         buf[10] = 0;
492         buf[11] = 0;
493         buf[12] = 0;
494         buf[13] = 0;
495         buf[14] = 0;
496         buf[15] = 0;
497         buf[19] = addr & 0xff;
498         addr  >>= 8;
499         buf[18] = addr & 0xff;
500         addr  >>= 8;
501         buf[17] = addr & 0xff;
502         addr  >>= 8;
503         buf[16] = addr & 0x0f;
504 }
505 
506 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
507 {
508         if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
509                 memcpy(buf, broadcast, 4);
510         else
511                 memcpy(buf, &naddr, sizeof(naddr));
512 }
513 
514 #if IS_ENABLED(CONFIG_IPV6)
515 #include <linux/ipv6.h>
516 #endif
517 
518 static __inline__ void inet_reset_saddr(struct sock *sk)
519 {
520         inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
521 #if IS_ENABLED(CONFIG_IPV6)
522         if (sk->sk_family == PF_INET6) {
523                 struct ipv6_pinfo *np = inet6_sk(sk);
524 
525                 memset(&np->saddr, 0, sizeof(np->saddr));
526                 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
527         }
528 #endif
529 }
530 
531 #endif
532 
533 static inline unsigned int ipv4_addr_hash(__be32 ip)
534 {
535         return (__force unsigned int) ip;
536 }
537 
538 static inline u32 ipv4_portaddr_hash(const struct net *net,
539                                      __be32 saddr,
540                                      unsigned int port)
541 {
542         return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
543 }
544 
545 bool ip_call_ra_chain(struct sk_buff *skb);
546 
547 /*
548  *      Functions provided by ip_fragment.c
549  */
550 
551 enum ip_defrag_users {
552         IP_DEFRAG_LOCAL_DELIVER,
553         IP_DEFRAG_CALL_RA_CHAIN,
554         IP_DEFRAG_CONNTRACK_IN,
555         __IP_DEFRAG_CONNTRACK_IN_END    = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
556         IP_DEFRAG_CONNTRACK_OUT,
557         __IP_DEFRAG_CONNTRACK_OUT_END   = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
558         IP_DEFRAG_CONNTRACK_BRIDGE_IN,
559         __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
560         IP_DEFRAG_VS_IN,
561         IP_DEFRAG_VS_OUT,
562         IP_DEFRAG_VS_FWD,
563         IP_DEFRAG_AF_PACKET,
564         IP_DEFRAG_MACVLAN,
565 };
566 
567 /* Return true if the value of 'user' is between 'lower_bond'
568  * and 'upper_bond' inclusively.
569  */
570 static inline bool ip_defrag_user_in_between(u32 user,
571                                              enum ip_defrag_users lower_bond,
572                                              enum ip_defrag_users upper_bond)
573 {
574         return user >= lower_bond && user <= upper_bond;
575 }
576 
577 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
578 #ifdef CONFIG_INET
579 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
580 #else
581 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
582 {
583         return skb;
584 }
585 #endif
586 int ip_frag_mem(struct net *net);
587 
588 /*
589  *      Functions provided by ip_forward.c
590  */
591  
592 int ip_forward(struct sk_buff *skb);
593  
594 /*
595  *      Functions provided by ip_options.c
596  */
597  
598 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
599                       __be32 daddr, struct rtable *rt, int is_frag);
600 
601 int __ip_options_echo(struct net *net, struct ip_options *dopt,
602                       struct sk_buff *skb, const struct ip_options *sopt);
603 static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
604                                   struct sk_buff *skb)
605 {
606         return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
607 }
608 
609 void ip_options_fragment(struct sk_buff *skb);
610 int ip_options_compile(struct net *net, struct ip_options *opt,
611                        struct sk_buff *skb);
612 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
613                    unsigned char *data, int optlen);
614 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
615                              unsigned char __user *data, int optlen);
616 void ip_options_undo(struct ip_options *opt);
617 void ip_forward_options(struct sk_buff *skb);
618 int ip_options_rcv_srr(struct sk_buff *skb);
619 
620 /*
621  *      Functions provided by ip_sockglue.c
622  */
623 
624 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
625 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
626                          struct sk_buff *skb, int tlen, int offset);
627 int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
628                  struct ipcm_cookie *ipc, bool allow_ipv6);
629 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
630                   unsigned int optlen);
631 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
632                   int __user *optlen);
633 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
634                          char __user *optval, unsigned int optlen);
635 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
636                          char __user *optval, int __user *optlen);
637 int ip_ra_control(struct sock *sk, unsigned char on,
638                   void (*destructor)(struct sock *));
639 
640 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
641 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
642                    u32 info, u8 *payload);
643 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
644                     u32 info);
645 
646 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
647 {
648         ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
649 }
650 
651 bool icmp_global_allow(void);
652 extern int sysctl_icmp_msgs_per_sec;
653 extern int sysctl_icmp_msgs_burst;
654 
655 #ifdef CONFIG_PROC_FS
656 int ip_misc_proc_init(void);
657 #endif
658 
659 #endif  /* _IP_H */
660 

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