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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_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         1
 43 #define IPSKB_XFRM_TUNNEL_SIZE  2
 44 #define IPSKB_XFRM_TRANSFORMED  4
 45 #define IPSKB_FRAG_COMPLETE     8
 46 #define IPSKB_REROUTED          16
 47 
 48         u16                     frag_max_size;
 49 };
 50 
 51 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
 52 {
 53         return ip_hdr(skb)->ihl * 4;
 54 }
 55 
 56 struct ipcm_cookie {
 57         __be32                  addr;
 58         int                     oif;
 59         struct ip_options_rcu   *opt;
 60         __u8                    tx_flags;
 61         __u8                    ttl;
 62         __s16                   tos;
 63         char                    priority;
 64 };
 65 
 66 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
 67 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
 68 
 69 struct ip_ra_chain {
 70         struct ip_ra_chain __rcu *next;
 71         struct sock             *sk;
 72         union {
 73                 void                    (*destructor)(struct sock *);
 74                 struct sock             *saved_sk;
 75         };
 76         struct rcu_head         rcu;
 77 };
 78 
 79 extern struct ip_ra_chain __rcu *ip_ra_chain;
 80 
 81 /* IP flags. */
 82 #define IP_CE           0x8000          /* Flag: "Congestion"           */
 83 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
 84 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
 85 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
 86 
 87 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
 88 
 89 struct msghdr;
 90 struct net_device;
 91 struct packet_type;
 92 struct rtable;
 93 struct sockaddr;
 94 
 95 int igmp_mc_init(void);
 96 
 97 /*
 98  *      Functions provided by ip.c
 99  */
100 
101 int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
102                           __be32 saddr, __be32 daddr,
103                           struct ip_options_rcu *opt);
104 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
105            struct net_device *orig_dev);
106 int ip_local_deliver(struct sk_buff *skb);
107 int ip_mr_input(struct sk_buff *skb);
108 int ip_output(struct sock *sk, struct sk_buff *skb);
109 int ip_mc_output(struct sock *sk, struct sk_buff *skb);
110 int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
111 int ip_do_nat(struct sk_buff *skb);
112 void ip_send_check(struct iphdr *ip);
113 int __ip_local_out(struct sk_buff *skb);
114 int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
115 static inline int ip_local_out(struct sk_buff *skb)
116 {
117         return ip_local_out_sk(skb->sk, skb);
118 }
119 
120 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
121 void ip_init(void);
122 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
123                    int getfrag(void *from, char *to, int offset, int len,
124                                int odd, struct sk_buff *skb),
125                    void *from, int len, int protolen,
126                    struct ipcm_cookie *ipc,
127                    struct rtable **rt,
128                    unsigned int flags);
129 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
130                        struct sk_buff *skb);
131 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
132                        int offset, size_t size, int flags);
133 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
134                               struct sk_buff_head *queue,
135                               struct inet_cork *cork);
136 int ip_send_skb(struct net *net, struct sk_buff *skb);
137 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
138 void ip_flush_pending_frames(struct sock *sk);
139 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
140                             int getfrag(void *from, char *to, int offset,
141                                         int len, int odd, struct sk_buff *skb),
142                             void *from, int length, int transhdrlen,
143                             struct ipcm_cookie *ipc, struct rtable **rtp,
144                             unsigned int flags);
145 
146 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
147 {
148         return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
149 }
150 
151 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
152 {
153         return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
154 }
155 
156 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
157 {
158         return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
159 }
160 
161 /* datagram.c */
162 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
163 
164 void ip4_datagram_release_cb(struct sock *sk);
165 
166 struct ip_reply_arg {
167         struct kvec iov[1];   
168         int         flags;
169         __wsum      csum;
170         int         csumoffset; /* u16 offset of csum in iov[0].iov_base */
171                                 /* -1 if not needed */ 
172         int         bound_dev_if;
173         u8          tos;
174 }; 
175 
176 #define IP_REPLY_ARG_NOSRCCHECK 1
177 
178 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
179 {
180         return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
181 }
182 
183 void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
184                            __be32 saddr, const struct ip_reply_arg *arg,
185                            unsigned int len);
186 
187 #define IP_INC_STATS(net, field)        SNMP_INC_STATS64((net)->mib.ip_statistics, field)
188 #define IP_INC_STATS_BH(net, field)     SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
189 #define IP_ADD_STATS(net, field, val)   SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
190 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
191 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
192 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
193 #define NET_INC_STATS(net, field)       SNMP_INC_STATS((net)->mib.net_statistics, field)
194 #define NET_INC_STATS_BH(net, field)    SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
195 #define NET_INC_STATS_USER(net, field)  SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
196 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
197 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
198 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
199 
200 unsigned long snmp_fold_field(void __percpu *mib, int offt);
201 #if BITS_PER_LONG==32
202 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
203 #else
204 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
205 {
206         return snmp_fold_field(mib, offt);
207 }
208 #endif
209 
210 void inet_get_local_port_range(struct net *net, int *low, int *high);
211 
212 #ifdef CONFIG_SYSCTL
213 static inline int inet_is_local_reserved_port(struct net *net, int port)
214 {
215         if (ccs_lport_reserved(port))
216                 return 1;
217         if (!net->ipv4.sysctl_local_reserved_ports)
218                 return 0;
219         return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
220 }
221 
222 static inline bool sysctl_dev_name_is_allowed(const char *name)
223 {
224         return strcmp(name, "default") != 0  && strcmp(name, "all") != 0;
225 }
226 
227 #else
228 static inline int inet_is_local_reserved_port(struct net *net, int port)
229 {
230         if (ccs_lport_reserved(port))
231                 return 1;
232         return 0;
233 }
234 #endif
235 
236 extern int sysctl_ip_nonlocal_bind;
237 
238 /* From inetpeer.c */
239 extern int inet_peer_threshold;
240 extern int inet_peer_minttl;
241 extern int inet_peer_maxttl;
242 
243 /* From ip_input.c */
244 extern int sysctl_ip_early_demux;
245 
246 /* From ip_output.c */
247 extern int sysctl_ip_dynaddr;
248 
249 void ipfrag_init(void);
250 
251 void ip_static_sysctl_init(void);
252 
253 #define IP4_REPLY_MARK(net, mark) \
254         ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
255 
256 static inline bool ip_is_fragment(const struct iphdr *iph)
257 {
258         return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
259 }
260 
261 #ifdef CONFIG_INET
262 #include <net/dst.h>
263 
264 /* The function in 2.2 was invalid, producing wrong result for
265  * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
266 static inline
267 int ip_decrease_ttl(struct iphdr *iph)
268 {
269         u32 check = (__force u32)iph->check;
270         check += (__force u32)htons(0x0100);
271         iph->check = (__force __sum16)(check + (check>=0xFFFF));
272         return --iph->ttl;
273 }
274 
275 static inline
276 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
277 {
278         return  inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
279                 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
280                  !(dst_metric_locked(dst, RTAX_MTU)));
281 }
282 
283 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
284 {
285         return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
286                inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
287 }
288 
289 static inline bool ip_sk_use_pmtu(const struct sock *sk)
290 {
291         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
292 }
293 
294 static inline bool ip_sk_ignore_df(const struct sock *sk)
295 {
296         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
297                inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
298 }
299 
300 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
301                                                     bool forwarding)
302 {
303         struct net *net = dev_net(dst->dev);
304 
305         if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
306             dst_metric_locked(dst, RTAX_MTU) ||
307             !forwarding)
308                 return dst_mtu(dst);
309 
310         return min(dst->dev->mtu, IP_MAX_MTU);
311 }
312 
313 static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
314 {
315         if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
316                 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
317                 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
318         } else {
319                 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
320         }
321 }
322 
323 u32 ip_idents_reserve(u32 hash, int segs);
324 void __ip_select_ident(struct iphdr *iph, int segs);
325 
326 static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
327 {
328         struct iphdr *iph = ip_hdr(skb);
329 
330         if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
331                 /* This is only to work around buggy Windows95/2000
332                  * VJ compression implementations.  If the ID field
333                  * does not change, they drop every other packet in
334                  * a TCP stream using header compression.
335                  */
336                 if (sk && inet_sk(sk)->inet_daddr) {
337                         iph->id = htons(inet_sk(sk)->inet_id);
338                         inet_sk(sk)->inet_id += segs;
339                 } else {
340                         iph->id = 0;
341                 }
342         } else {
343                 __ip_select_ident(iph, segs);
344         }
345 }
346 
347 static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
348 {
349         ip_select_ident_segs(skb, sk, 1);
350 }
351 
352 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
353 {
354         return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
355                                   skb->len, proto, 0);
356 }
357 
358 static inline void inet_set_txhash(struct sock *sk)
359 {
360         struct inet_sock *inet = inet_sk(sk);
361         struct flow_keys keys;
362 
363         keys.src = inet->inet_saddr;
364         keys.dst = inet->inet_daddr;
365         keys.port16[0] = inet->inet_sport;
366         keys.port16[1] = inet->inet_dport;
367 
368         sk->sk_txhash = flow_hash_from_keys(&keys);
369 }
370 
371 /*
372  *      Map a multicast IP onto multicast MAC for type ethernet.
373  */
374 
375 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
376 {
377         __u32 addr=ntohl(naddr);
378         buf[0]=0x01;
379         buf[1]=0x00;
380         buf[2]=0x5e;
381         buf[5]=addr&0xFF;
382         addr>>=8;
383         buf[4]=addr&0xFF;
384         addr>>=8;
385         buf[3]=addr&0x7F;
386 }
387 
388 /*
389  *      Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
390  *      Leave P_Key as 0 to be filled in by driver.
391  */
392 
393 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
394 {
395         __u32 addr;
396         unsigned char scope = broadcast[5] & 0xF;
397 
398         buf[0]  = 0;            /* Reserved */
399         buf[1]  = 0xff;         /* Multicast QPN */
400         buf[2]  = 0xff;
401         buf[3]  = 0xff;
402         addr    = ntohl(naddr);
403         buf[4]  = 0xff;
404         buf[5]  = 0x10 | scope; /* scope from broadcast address */
405         buf[6]  = 0x40;         /* IPv4 signature */
406         buf[7]  = 0x1b;
407         buf[8]  = broadcast[8];         /* P_Key */
408         buf[9]  = broadcast[9];
409         buf[10] = 0;
410         buf[11] = 0;
411         buf[12] = 0;
412         buf[13] = 0;
413         buf[14] = 0;
414         buf[15] = 0;
415         buf[19] = addr & 0xff;
416         addr  >>= 8;
417         buf[18] = addr & 0xff;
418         addr  >>= 8;
419         buf[17] = addr & 0xff;
420         addr  >>= 8;
421         buf[16] = addr & 0x0f;
422 }
423 
424 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
425 {
426         if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
427                 memcpy(buf, broadcast, 4);
428         else
429                 memcpy(buf, &naddr, sizeof(naddr));
430 }
431 
432 #if IS_ENABLED(CONFIG_IPV6)
433 #include <linux/ipv6.h>
434 #endif
435 
436 static __inline__ void inet_reset_saddr(struct sock *sk)
437 {
438         inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
439 #if IS_ENABLED(CONFIG_IPV6)
440         if (sk->sk_family == PF_INET6) {
441                 struct ipv6_pinfo *np = inet6_sk(sk);
442 
443                 memset(&np->saddr, 0, sizeof(np->saddr));
444                 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
445         }
446 #endif
447 }
448 
449 #endif
450 
451 static inline int sk_mc_loop(struct sock *sk)
452 {
453         if (!sk)
454                 return 1;
455         switch (sk->sk_family) {
456         case AF_INET:
457                 return inet_sk(sk)->mc_loop;
458 #if IS_ENABLED(CONFIG_IPV6)
459         case AF_INET6:
460                 return inet6_sk(sk)->mc_loop;
461 #endif
462         }
463         WARN_ON(1);
464         return 1;
465 }
466 
467 bool ip_call_ra_chain(struct sk_buff *skb);
468 
469 /*
470  *      Functions provided by ip_fragment.c
471  */
472 
473 enum ip_defrag_users {
474         IP_DEFRAG_LOCAL_DELIVER,
475         IP_DEFRAG_CALL_RA_CHAIN,
476         IP_DEFRAG_CONNTRACK_IN,
477         __IP_DEFRAG_CONNTRACK_IN_END    = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
478         IP_DEFRAG_CONNTRACK_OUT,
479         __IP_DEFRAG_CONNTRACK_OUT_END   = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
480         IP_DEFRAG_CONNTRACK_BRIDGE_IN,
481         __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
482         IP_DEFRAG_VS_IN,
483         IP_DEFRAG_VS_OUT,
484         IP_DEFRAG_VS_FWD,
485         IP_DEFRAG_AF_PACKET,
486         IP_DEFRAG_MACVLAN,
487 };
488 
489 int ip_defrag(struct sk_buff *skb, u32 user);
490 #ifdef CONFIG_INET
491 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
492 #else
493 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
494 {
495         return skb;
496 }
497 #endif
498 int ip_frag_mem(struct net *net);
499 
500 /*
501  *      Functions provided by ip_forward.c
502  */
503  
504 int ip_forward(struct sk_buff *skb);
505  
506 /*
507  *      Functions provided by ip_options.c
508  */
509  
510 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
511                       __be32 daddr, struct rtable *rt, int is_frag);
512 int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
513 void ip_options_fragment(struct sk_buff *skb);
514 int ip_options_compile(struct net *net, struct ip_options *opt,
515                        struct sk_buff *skb);
516 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
517                    unsigned char *data, int optlen);
518 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
519                              unsigned char __user *data, int optlen);
520 void ip_options_undo(struct ip_options *opt);
521 void ip_forward_options(struct sk_buff *skb);
522 int ip_options_rcv_srr(struct sk_buff *skb);
523 
524 /*
525  *      Functions provided by ip_sockglue.c
526  */
527 
528 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
529 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
530 int ip_cmsg_send(struct net *net, struct msghdr *msg,
531                  struct ipcm_cookie *ipc, bool allow_ipv6);
532 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
533                   unsigned int optlen);
534 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
535                   int __user *optlen);
536 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
537                          char __user *optval, unsigned int optlen);
538 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
539                          char __user *optval, int __user *optlen);
540 int ip_ra_control(struct sock *sk, unsigned char on,
541                   void (*destructor)(struct sock *));
542 
543 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
544 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
545                    u32 info, u8 *payload);
546 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
547                     u32 info);
548 
549 #ifdef CONFIG_PROC_FS
550 int ip_misc_proc_init(void);
551 #endif
552 
553 #endif  /* _IP_H */
554 

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