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

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