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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 #define IPV4_MIN_MTU            68                      /* RFC 791 */
 37 
 38 struct sock;
 39 
 40 struct inet_skb_parm {
 41         struct ip_options       opt;            /* Compiled IP options          */
 42         unsigned char           flags;
 43 
 44 #define IPSKB_FORWARDED         BIT(0)
 45 #define IPSKB_XFRM_TUNNEL_SIZE  BIT(1)
 46 #define IPSKB_XFRM_TRANSFORMED  BIT(2)
 47 #define IPSKB_FRAG_COMPLETE     BIT(3)
 48 #define IPSKB_REROUTED          BIT(4)
 49 #define IPSKB_DOREDIRECT        BIT(5)
 50 
 51         u16                     frag_max_size;
 52 };
 53 
 54 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
 55 {
 56         return ip_hdr(skb)->ihl * 4;
 57 }
 58 
 59 struct ipcm_cookie {
 60         __be32                  addr;
 61         int                     oif;
 62         struct ip_options_rcu   *opt;
 63         __u8                    tx_flags;
 64         __u8                    ttl;
 65         __s16                   tos;
 66         char                    priority;
 67 };
 68 
 69 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
 70 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
 71 
 72 struct ip_ra_chain {
 73         struct ip_ra_chain __rcu *next;
 74         struct sock             *sk;
 75         union {
 76                 void                    (*destructor)(struct sock *);
 77                 struct sock             *saved_sk;
 78         };
 79         struct rcu_head         rcu;
 80 };
 81 
 82 extern struct ip_ra_chain __rcu *ip_ra_chain;
 83 
 84 /* IP flags. */
 85 #define IP_CE           0x8000          /* Flag: "Congestion"           */
 86 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
 87 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
 88 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
 89 
 90 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
 91 
 92 struct msghdr;
 93 struct net_device;
 94 struct packet_type;
 95 struct rtable;
 96 struct sockaddr;
 97 
 98 int igmp_mc_init(void);
 99 
100 /*
101  *      Functions provided by ip.c
102  */
103 
104 int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
105                           __be32 saddr, __be32 daddr,
106                           struct ip_options_rcu *opt);
107 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
108            struct net_device *orig_dev);
109 int ip_local_deliver(struct sk_buff *skb);
110 int ip_mr_input(struct sk_buff *skb);
111 int ip_output(struct sock *sk, struct sk_buff *skb);
112 int ip_mc_output(struct sock *sk, struct sk_buff *skb);
113 int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
114 int ip_do_nat(struct sk_buff *skb);
115 void ip_send_check(struct iphdr *ip);
116 int __ip_local_out(struct sk_buff *skb);
117 int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
118 static inline int ip_local_out(struct sk_buff *skb)
119 {
120         return ip_local_out_sk(skb->sk, skb);
121 }
122 
123 int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
124 void ip_init(void);
125 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
126                    int getfrag(void *from, char *to, int offset, int len,
127                                int odd, struct sk_buff *skb),
128                    void *from, int len, int protolen,
129                    struct ipcm_cookie *ipc,
130                    struct rtable **rt,
131                    unsigned int flags);
132 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
133                        struct sk_buff *skb);
134 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
135                        int offset, size_t size, int flags);
136 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
137                               struct sk_buff_head *queue,
138                               struct inet_cork *cork);
139 int ip_send_skb(struct net *net, struct sk_buff *skb);
140 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
141 void ip_flush_pending_frames(struct sock *sk);
142 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
143                             int getfrag(void *from, char *to, int offset,
144                                         int len, int odd, struct sk_buff *skb),
145                             void *from, int length, int transhdrlen,
146                             struct ipcm_cookie *ipc, struct rtable **rtp,
147                             unsigned int flags);
148 
149 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
150 {
151         return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
152 }
153 
154 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
155 {
156         return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
157 }
158 
159 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
160 {
161         return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
162 }
163 
164 /* datagram.c */
165 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
166 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
167 
168 void ip4_datagram_release_cb(struct sock *sk);
169 
170 struct ip_reply_arg {
171         struct kvec iov[1];   
172         int         flags;
173         __wsum      csum;
174         int         csumoffset; /* u16 offset of csum in iov[0].iov_base */
175                                 /* -1 if not needed */ 
176         int         bound_dev_if;
177         u8          tos;
178 }; 
179 
180 #define IP_REPLY_ARG_NOSRCCHECK 1
181 
182 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
183 {
184         return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
185 }
186 
187 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
188                            const struct ip_options *sopt,
189                            __be32 daddr, __be32 saddr,
190                            const struct ip_reply_arg *arg,
191                            unsigned int len);
192 
193 #define IP_INC_STATS(net, field)        SNMP_INC_STATS64((net)->mib.ip_statistics, field)
194 #define IP_INC_STATS_BH(net, field)     SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
195 #define IP_ADD_STATS(net, field, val)   SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
196 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
197 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
198 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
199 #define NET_INC_STATS(net, field)       SNMP_INC_STATS((net)->mib.net_statistics, field)
200 #define NET_INC_STATS_BH(net, field)    SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
201 #define NET_INC_STATS_USER(net, field)  SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
202 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
203 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
204 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
205 
206 unsigned long snmp_fold_field(void __percpu *mib, int offt);
207 #if BITS_PER_LONG==32
208 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
209 #else
210 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
211 {
212         return snmp_fold_field(mib, offt);
213 }
214 #endif
215 
216 void inet_get_local_port_range(struct net *net, int *low, int *high);
217 
218 #ifdef CONFIG_SYSCTL
219 static inline int inet_is_local_reserved_port(struct net *net, int port)
220 {
221         if (ccs_lport_reserved(port))
222                 return 1;
223         if (!net->ipv4.sysctl_local_reserved_ports)
224                 return 0;
225         return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
226 }
227 
228 static inline bool sysctl_dev_name_is_allowed(const char *name)
229 {
230         return strcmp(name, "default") != 0  && strcmp(name, "all") != 0;
231 }
232 
233 #else
234 static inline int inet_is_local_reserved_port(struct net *net, int port)
235 {
236         if (ccs_lport_reserved(port))
237                 return 1;
238         return 0;
239 }
240 #endif
241 
242 __be32 inet_current_timestamp(void);
243 
244 /* From inetpeer.c */
245 extern int inet_peer_threshold;
246 extern int inet_peer_minttl;
247 extern int inet_peer_maxttl;
248 
249 /* From ip_input.c */
250 extern int sysctl_ip_early_demux;
251 
252 /* From ip_output.c */
253 extern int sysctl_ip_dynaddr;
254 
255 void ipfrag_init(void);
256 
257 void ip_static_sysctl_init(void);
258 
259 #define IP4_REPLY_MARK(net, mark) \
260         ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
261 
262 static inline bool ip_is_fragment(const struct iphdr *iph)
263 {
264         return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
265 }
266 
267 #ifdef CONFIG_INET
268 #include <net/dst.h>
269 
270 /* The function in 2.2 was invalid, producing wrong result for
271  * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
272 static inline
273 int ip_decrease_ttl(struct iphdr *iph)
274 {
275         u32 check = (__force u32)iph->check;
276         check += (__force u32)htons(0x0100);
277         iph->check = (__force __sum16)(check + (check>=0xFFFF));
278         return --iph->ttl;
279 }
280 
281 static inline
282 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
283 {
284         return  inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
285                 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
286                  !(dst_metric_locked(dst, RTAX_MTU)));
287 }
288 
289 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
290 {
291         return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
292                inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
293 }
294 
295 static inline bool ip_sk_use_pmtu(const struct sock *sk)
296 {
297         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
298 }
299 
300 static inline bool ip_sk_ignore_df(const struct sock *sk)
301 {
302         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
303                inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
304 }
305 
306 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
307                                                     bool forwarding)
308 {
309         struct net *net = dev_net(dst->dev);
310 
311         if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
312             dst_metric_locked(dst, RTAX_MTU) ||
313             !forwarding)
314                 return dst_mtu(dst);
315 
316         return min(dst->dev->mtu, IP_MAX_MTU);
317 }
318 
319 static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
320 {
321         if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
322                 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
323                 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
324         } else {
325                 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
326         }
327 }
328 
329 u32 ip_idents_reserve(u32 hash, int segs);
330 void __ip_select_ident(struct iphdr *iph, int segs);
331 
332 static inline void ip_select_ident_segs(struct sk_buff *skb, struct sock *sk, int segs)
333 {
334         struct iphdr *iph = ip_hdr(skb);
335 
336         if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
337                 /* This is only to work around buggy Windows95/2000
338                  * VJ compression implementations.  If the ID field
339                  * does not change, they drop every other packet in
340                  * a TCP stream using header compression.
341                  */
342                 if (sk && inet_sk(sk)->inet_daddr) {
343                         iph->id = htons(inet_sk(sk)->inet_id);
344                         inet_sk(sk)->inet_id += segs;
345                 } else {
346                         iph->id = 0;
347                 }
348         } else {
349                 __ip_select_ident(iph, segs);
350         }
351 }
352 
353 static inline void ip_select_ident(struct sk_buff *skb, struct sock *sk)
354 {
355         ip_select_ident_segs(skb, sk, 1);
356 }
357 
358 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
359 {
360         return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
361                                   skb->len, proto, 0);
362 }
363 
364 static inline void inet_set_txhash(struct sock *sk)
365 {
366         struct inet_sock *inet = inet_sk(sk);
367         struct flow_keys keys;
368 
369         keys.src = inet->inet_saddr;
370         keys.dst = inet->inet_daddr;
371         keys.port16[0] = inet->inet_sport;
372         keys.port16[1] = inet->inet_dport;
373 
374         sk->sk_txhash = flow_hash_from_keys(&keys);
375 }
376 
377 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
378 {
379         const struct iphdr *iph = skb_gro_network_header(skb);
380 
381         return csum_tcpudp_nofold(iph->saddr, iph->daddr,
382                                   skb_gro_len(skb), proto, 0);
383 }
384 
385 /*
386  *      Map a multicast IP onto multicast MAC for type ethernet.
387  */
388 
389 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
390 {
391         __u32 addr=ntohl(naddr);
392         buf[0]=0x01;
393         buf[1]=0x00;
394         buf[2]=0x5e;
395         buf[5]=addr&0xFF;
396         addr>>=8;
397         buf[4]=addr&0xFF;
398         addr>>=8;
399         buf[3]=addr&0x7F;
400 }
401 
402 /*
403  *      Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
404  *      Leave P_Key as 0 to be filled in by driver.
405  */
406 
407 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
408 {
409         __u32 addr;
410         unsigned char scope = broadcast[5] & 0xF;
411 
412         buf[0]  = 0;            /* Reserved */
413         buf[1]  = 0xff;         /* Multicast QPN */
414         buf[2]  = 0xff;
415         buf[3]  = 0xff;
416         addr    = ntohl(naddr);
417         buf[4]  = 0xff;
418         buf[5]  = 0x10 | scope; /* scope from broadcast address */
419         buf[6]  = 0x40;         /* IPv4 signature */
420         buf[7]  = 0x1b;
421         buf[8]  = broadcast[8];         /* P_Key */
422         buf[9]  = broadcast[9];
423         buf[10] = 0;
424         buf[11] = 0;
425         buf[12] = 0;
426         buf[13] = 0;
427         buf[14] = 0;
428         buf[15] = 0;
429         buf[19] = addr & 0xff;
430         addr  >>= 8;
431         buf[18] = addr & 0xff;
432         addr  >>= 8;
433         buf[17] = addr & 0xff;
434         addr  >>= 8;
435         buf[16] = addr & 0x0f;
436 }
437 
438 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
439 {
440         if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
441                 memcpy(buf, broadcast, 4);
442         else
443                 memcpy(buf, &naddr, sizeof(naddr));
444 }
445 
446 #if IS_ENABLED(CONFIG_IPV6)
447 #include <linux/ipv6.h>
448 #endif
449 
450 static __inline__ void inet_reset_saddr(struct sock *sk)
451 {
452         inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
453 #if IS_ENABLED(CONFIG_IPV6)
454         if (sk->sk_family == PF_INET6) {
455                 struct ipv6_pinfo *np = inet6_sk(sk);
456 
457                 memset(&np->saddr, 0, sizeof(np->saddr));
458                 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
459         }
460 #endif
461 }
462 
463 #endif
464 
465 bool ip_call_ra_chain(struct sk_buff *skb);
466 
467 /*
468  *      Functions provided by ip_fragment.c
469  */
470 
471 enum ip_defrag_users {
472         IP_DEFRAG_LOCAL_DELIVER,
473         IP_DEFRAG_CALL_RA_CHAIN,
474         IP_DEFRAG_CONNTRACK_IN,
475         __IP_DEFRAG_CONNTRACK_IN_END    = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
476         IP_DEFRAG_CONNTRACK_OUT,
477         __IP_DEFRAG_CONNTRACK_OUT_END   = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
478         IP_DEFRAG_CONNTRACK_BRIDGE_IN,
479         __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
480         IP_DEFRAG_VS_IN,
481         IP_DEFRAG_VS_OUT,
482         IP_DEFRAG_VS_FWD,
483         IP_DEFRAG_AF_PACKET,
484         IP_DEFRAG_MACVLAN,
485 };
486 
487 int ip_defrag(struct sk_buff *skb, u32 user);
488 #ifdef CONFIG_INET
489 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
490 #else
491 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
492 {
493         return skb;
494 }
495 #endif
496 int ip_frag_mem(struct net *net);
497 
498 /*
499  *      Functions provided by ip_forward.c
500  */
501  
502 int ip_forward(struct sk_buff *skb);
503  
504 /*
505  *      Functions provided by ip_options.c
506  */
507  
508 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
509                       __be32 daddr, struct rtable *rt, int is_frag);
510 
511 int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
512                       const struct ip_options *sopt);
513 static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
514 {
515         return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
516 }
517 
518 void ip_options_fragment(struct sk_buff *skb);
519 int __ip_options_compile(struct net *net, struct ip_options *opt,
520                          struct sk_buff *skb, __be32 *info);
521 int ip_options_compile(struct net *net, struct ip_options *opt,
522                        struct sk_buff *skb);
523 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
524                    unsigned char *data, int optlen);
525 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
526                              unsigned char __user *data, int optlen);
527 void ip_options_undo(struct ip_options *opt);
528 void ip_forward_options(struct sk_buff *skb);
529 int ip_options_rcv_srr(struct sk_buff *skb);
530 
531 /*
532  *      Functions provided by ip_sockglue.c
533  */
534 
535 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
536 void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
537 int ip_cmsg_send(struct net *net, struct msghdr *msg,
538                  struct ipcm_cookie *ipc, bool allow_ipv6);
539 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
540                   unsigned int optlen);
541 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
542                   int __user *optlen);
543 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
544                          char __user *optval, unsigned int optlen);
545 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
546                          char __user *optval, int __user *optlen);
547 int ip_ra_control(struct sock *sk, unsigned char on,
548                   void (*destructor)(struct sock *));
549 
550 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
551 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
552                    u32 info, u8 *payload);
553 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
554                     u32 info);
555 
556 bool icmp_global_allow(void);
557 extern int sysctl_icmp_msgs_per_sec;
558 extern int sysctl_icmp_msgs_burst;
559 
560 #ifdef CONFIG_PROC_FS
561 int ip_misc_proc_init(void);
562 #endif
563 
564 #endif  /* _IP_H */
565 

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