~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.14-rc3 ] ~ [ linux-5.13.5 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.53 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.135 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.198 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.240 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.276 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.276 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  4  *              operating system.  INET is implemented using the  BSD Socket
  5  *              interface as the means of communication with the user level.
  6  *
  7  *              Definitions for the IP module.
  8  *
  9  * Version:     @(#)ip.h        1.0.2   05/07/93
 10  *
 11  * Authors:     Ross Biro
 12  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 13  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 14  *
 15  * Changes:
 16  *              Mike McLagan    :       Routing by source
 17  */
 18 #ifndef _IP_H
 19 #define _IP_H
 20 
 21 #include <linux/types.h>
 22 #include <linux/ip.h>
 23 #include <linux/in.h>
 24 #include <linux/skbuff.h>
 25 #include <linux/jhash.h>
 26 
 27 #include <net/inet_sock.h>
 28 #include <net/route.h>
 29 #include <net/snmp.h>
 30 #include <net/flow.h>
 31 #include <net/flow_dissector.h>
 32 #include <net/netns/hash.h>
 33 
 34 #define IPV4_MAX_PMTU           65535U          /* RFC 2675, Section 5.1 */
 35 #define IPV4_MIN_MTU            68                      /* RFC 791 */
 36 
 37 extern unsigned int sysctl_fib_sync_mem;
 38 extern unsigned int sysctl_fib_sync_mem_min;
 39 extern unsigned int sysctl_fib_sync_mem_max;
 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                    ttl;
 76         __s16                   tos;
 77         char                    priority;
 78         __u16                   gso_size;
 79 };
 80 
 81 static inline void ipcm_init(struct ipcm_cookie *ipcm)
 82 {
 83         *ipcm = (struct ipcm_cookie) { .tos = -1 };
 84 }
 85 
 86 static inline void ipcm_init_sk(struct ipcm_cookie *ipcm,
 87                                 const struct inet_sock *inet)
 88 {
 89         ipcm_init(ipcm);
 90 
 91         ipcm->sockc.mark = inet->sk.sk_mark;
 92         ipcm->sockc.tsflags = inet->sk.sk_tsflags;
 93         ipcm->oif = inet->sk.sk_bound_dev_if;
 94         ipcm->addr = inet->inet_saddr;
 95 }
 96 
 97 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
 98 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
 99 
100 /* return enslaved device index if relevant */
101 static inline int inet_sdif(struct sk_buff *skb)
102 {
103 #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
104         if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
105                 return IPCB(skb)->iif;
106 #endif
107         return 0;
108 }
109 
110 /* Special input handler for packets caught by router alert option.
111    They are selected only by protocol field, and then processed likely
112    local ones; but only if someone wants them! Otherwise, router
113    not running rsvpd will kill RSVP.
114 
115    It is user level problem, what it will make with them.
116    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
117    but receiver should be enough clever f.e. to forward mtrace requests,
118    sent to multicast group to reach destination designated router.
119  */
120 
121 struct ip_ra_chain {
122         struct ip_ra_chain __rcu *next;
123         struct sock             *sk;
124         union {
125                 void                    (*destructor)(struct sock *);
126                 struct sock             *saved_sk;
127         };
128         struct rcu_head         rcu;
129 };
130 
131 /* IP flags. */
132 #define IP_CE           0x8000          /* Flag: "Congestion"           */
133 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
134 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
135 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
136 
137 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
138 
139 struct msghdr;
140 struct net_device;
141 struct packet_type;
142 struct rtable;
143 struct sockaddr;
144 
145 int igmp_mc_init(void);
146 
147 /*
148  *      Functions provided by ip.c
149  */
150 
151 int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
152                           __be32 saddr, __be32 daddr,
153                           struct ip_options_rcu *opt);
154 int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
155            struct net_device *orig_dev);
156 void ip_list_rcv(struct list_head *head, struct packet_type *pt,
157                  struct net_device *orig_dev);
158 int ip_local_deliver(struct sk_buff *skb);
159 void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto);
160 int ip_mr_input(struct sk_buff *skb);
161 int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
162 int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
163 int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
164                    int (*output)(struct net *, struct sock *, struct sk_buff *));
165 
166 struct ip_fraglist_iter {
167         struct sk_buff  *frag;
168         struct iphdr    *iph;
169         int             offset;
170         unsigned int    hlen;
171 };
172 
173 void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph,
174                       unsigned int hlen, struct ip_fraglist_iter *iter);
175 void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter);
176 
177 static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter)
178 {
179         struct sk_buff *skb = iter->frag;
180 
181         iter->frag = skb->next;
182         skb_mark_not_on_list(skb);
183 
184         return skb;
185 }
186 
187 struct ip_frag_state {
188         bool            DF;
189         unsigned int    hlen;
190         unsigned int    ll_rs;
191         unsigned int    mtu;
192         unsigned int    left;
193         int             offset;
194         int             ptr;
195         __be16          not_last_frag;
196 };
197 
198 void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs,
199                   unsigned int mtu, bool DF, struct ip_frag_state *state);
200 struct sk_buff *ip_frag_next(struct sk_buff *skb,
201                              struct ip_frag_state *state);
202 
203 void ip_send_check(struct iphdr *ip);
204 int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
205 int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
206 
207 int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
208                     __u8 tos);
209 void ip_init(void);
210 int ip_append_data(struct sock *sk, struct flowi4 *fl4,
211                    int getfrag(void *from, char *to, int offset, int len,
212                                int odd, struct sk_buff *skb),
213                    void *from, int len, int protolen,
214                    struct ipcm_cookie *ipc,
215                    struct rtable **rt,
216                    unsigned int flags);
217 int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
218                        struct sk_buff *skb);
219 ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
220                        int offset, size_t size, int flags);
221 struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
222                               struct sk_buff_head *queue,
223                               struct inet_cork *cork);
224 int ip_send_skb(struct net *net, struct sk_buff *skb);
225 int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
226 void ip_flush_pending_frames(struct sock *sk);
227 struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
228                             int getfrag(void *from, char *to, int offset,
229                                         int len, int odd, struct sk_buff *skb),
230                             void *from, int length, int transhdrlen,
231                             struct ipcm_cookie *ipc, struct rtable **rtp,
232                             struct inet_cork *cork, unsigned int flags);
233 
234 static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb,
235                                 struct flowi *fl)
236 {
237         return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos);
238 }
239 
240 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
241 {
242         return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
243 }
244 
245 static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
246 {
247         return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
248 }
249 
250 static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
251 {
252         return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
253 }
254 
255 /* datagram.c */
256 int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
257 int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
258 
259 void ip4_datagram_release_cb(struct sock *sk);
260 
261 struct ip_reply_arg {
262         struct kvec iov[1];
263         int         flags;
264         __wsum      csum;
265         int         csumoffset; /* u16 offset of csum in iov[0].iov_base */
266                                 /* -1 if not needed */
267         int         bound_dev_if;
268         u8          tos;
269         kuid_t      uid;
270 };
271 
272 #define IP_REPLY_ARG_NOSRCCHECK 1
273 
274 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
275 {
276         return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
277 }
278 
279 void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
280                            const struct ip_options *sopt,
281                            __be32 daddr, __be32 saddr,
282                            const struct ip_reply_arg *arg,
283                            unsigned int len, u64 transmit_time);
284 
285 #define IP_INC_STATS(net, field)        SNMP_INC_STATS64((net)->mib.ip_statistics, field)
286 #define __IP_INC_STATS(net, field)      __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
287 #define IP_ADD_STATS(net, field, val)   SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
288 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
289 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
290 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
291 #define NET_INC_STATS(net, field)       SNMP_INC_STATS((net)->mib.net_statistics, field)
292 #define __NET_INC_STATS(net, field)     __SNMP_INC_STATS((net)->mib.net_statistics, field)
293 #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
294 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
295 
296 u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
297 unsigned long snmp_fold_field(void __percpu *mib, int offt);
298 #if BITS_PER_LONG==32
299 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
300                          size_t syncp_offset);
301 u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
302 #else
303 static inline u64  snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
304                                         size_t syncp_offset)
305 {
306         return snmp_get_cpu_field(mib, cpu, offct);
307 
308 }
309 
310 static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
311 {
312         return snmp_fold_field(mib, offt);
313 }
314 #endif
315 
316 #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
317 { \
318         int i, c; \
319         for_each_possible_cpu(c) { \
320                 for (i = 0; stats_list[i].name; i++) \
321                         buff64[i] += snmp_get_cpu_field64( \
322                                         mib_statistic, \
323                                         c, stats_list[i].entry, \
324                                         offset); \
325         } \
326 }
327 
328 #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
329 { \
330         int i, c; \
331         for_each_possible_cpu(c) { \
332                 for (i = 0; stats_list[i].name; i++) \
333                         buff[i] += snmp_get_cpu_field( \
334                                                 mib_statistic, \
335                                                 c, stats_list[i].entry); \
336         } \
337 }
338 
339 void inet_get_local_port_range(struct net *net, int *low, int *high);
340 
341 #ifdef CONFIG_SYSCTL
342 static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port)
343 {
344         if (ccs_lport_reserved(port))
345                 return true;
346         if (!net->ipv4.sysctl_local_reserved_ports)
347                 return false;
348         return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
349 }
350 
351 static inline bool sysctl_dev_name_is_allowed(const char *name)
352 {
353         return strcmp(name, "default") != 0  && strcmp(name, "all") != 0;
354 }
355 
356 static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port)
357 {
358         return port < net->ipv4.sysctl_ip_prot_sock;
359 }
360 
361 #else
362 static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port)
363 {
364         if (ccs_lport_reserved(port))
365                 return true;
366         return false;
367 }
368 
369 static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port)
370 {
371         return port < PROT_SOCK;
372 }
373 #endif
374 
375 __be32 inet_current_timestamp(void);
376 
377 /* From inetpeer.c */
378 extern int inet_peer_threshold;
379 extern int inet_peer_minttl;
380 extern int inet_peer_maxttl;
381 
382 void ipfrag_init(void);
383 
384 void ip_static_sysctl_init(void);
385 
386 #define IP4_REPLY_MARK(net, mark) \
387         ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
388 
389 static inline bool ip_is_fragment(const struct iphdr *iph)
390 {
391         return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
392 }
393 
394 #ifdef CONFIG_INET
395 #include <net/dst.h>
396 
397 /* The function in 2.2 was invalid, producing wrong result for
398  * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
399 static inline
400 int ip_decrease_ttl(struct iphdr *iph)
401 {
402         u32 check = (__force u32)iph->check;
403         check += (__force u32)htons(0x0100);
404         iph->check = (__force __sum16)(check + (check>=0xFFFF));
405         return --iph->ttl;
406 }
407 
408 static inline int ip_mtu_locked(const struct dst_entry *dst)
409 {
410         const struct rtable *rt = (const struct rtable *)dst;
411 
412         return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
413 }
414 
415 static inline
416 int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
417 {
418         u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
419 
420         return  pmtudisc == IP_PMTUDISC_DO ||
421                 (pmtudisc == IP_PMTUDISC_WANT &&
422                  !ip_mtu_locked(dst));
423 }
424 
425 static inline bool ip_sk_accept_pmtu(const struct sock *sk)
426 {
427         return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
428                inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
429 }
430 
431 static inline bool ip_sk_use_pmtu(const struct sock *sk)
432 {
433         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
434 }
435 
436 static inline bool ip_sk_ignore_df(const struct sock *sk)
437 {
438         return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
439                inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
440 }
441 
442 static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
443                                                     bool forwarding)
444 {
445         struct net *net = dev_net(dst->dev);
446 
447         if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
448             ip_mtu_locked(dst) ||
449             !forwarding)
450                 return dst_mtu(dst);
451 
452         return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
453 }
454 
455 static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
456                                           const struct sk_buff *skb)
457 {
458         if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
459                 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
460 
461                 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
462         }
463 
464         return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
465 }
466 
467 struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
468                                         int fc_mx_len,
469                                         struct netlink_ext_ack *extack);
470 static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
471 {
472         if (fib_metrics != &dst_default_metrics &&
473             refcount_dec_and_test(&fib_metrics->refcnt))
474                 kfree(fib_metrics);
475 }
476 
477 /* ipv4 and ipv6 both use refcounted metrics if it is not the default */
478 static inline
479 void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics)
480 {
481         dst_init_metrics(dst, fib_metrics->metrics, true);
482 
483         if (fib_metrics != &dst_default_metrics) {
484                 dst->_metrics |= DST_METRICS_REFCOUNTED;
485                 refcount_inc(&fib_metrics->refcnt);
486         }
487 }
488 
489 static inline
490 void ip_dst_metrics_put(struct dst_entry *dst)
491 {
492         struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
493 
494         if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
495                 kfree(p);
496 }
497 
498 u32 ip_idents_reserve(u32 hash, int segs);
499 void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
500 
501 static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
502                                         struct sock *sk, int segs)
503 {
504         struct iphdr *iph = ip_hdr(skb);
505 
506         if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
507                 /* This is only to work around buggy Windows95/2000
508                  * VJ compression implementations.  If the ID field
509                  * does not change, they drop every other packet in
510                  * a TCP stream using header compression.
511                  */
512                 if (sk && inet_sk(sk)->inet_daddr) {
513                         iph->id = htons(inet_sk(sk)->inet_id);
514                         inet_sk(sk)->inet_id += segs;
515                 } else {
516                         iph->id = 0;
517                 }
518         } else {
519                 __ip_select_ident(net, iph, segs);
520         }
521 }
522 
523 static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
524                                    struct sock *sk)
525 {
526         ip_select_ident_segs(net, skb, sk, 1);
527 }
528 
529 static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
530 {
531         return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
532                                   skb->len, proto, 0);
533 }
534 
535 /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
536  * Equivalent to :      flow->v4addrs.src = iph->saddr;
537  *                      flow->v4addrs.dst = iph->daddr;
538  */
539 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
540                                             const struct iphdr *iph)
541 {
542         BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
543                      offsetof(typeof(flow->addrs), v4addrs.src) +
544                               sizeof(flow->addrs.v4addrs.src));
545         memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
546         flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
547 }
548 
549 static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
550 {
551         const struct iphdr *iph = skb_gro_network_header(skb);
552 
553         return csum_tcpudp_nofold(iph->saddr, iph->daddr,
554                                   skb_gro_len(skb), proto, 0);
555 }
556 
557 /*
558  *      Map a multicast IP onto multicast MAC for type ethernet.
559  */
560 
561 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
562 {
563         __u32 addr=ntohl(naddr);
564         buf[0]=0x01;
565         buf[1]=0x00;
566         buf[2]=0x5e;
567         buf[5]=addr&0xFF;
568         addr>>=8;
569         buf[4]=addr&0xFF;
570         addr>>=8;
571         buf[3]=addr&0x7F;
572 }
573 
574 /*
575  *      Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
576  *      Leave P_Key as 0 to be filled in by driver.
577  */
578 
579 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
580 {
581         __u32 addr;
582         unsigned char scope = broadcast[5] & 0xF;
583 
584         buf[0]  = 0;            /* Reserved */
585         buf[1]  = 0xff;         /* Multicast QPN */
586         buf[2]  = 0xff;
587         buf[3]  = 0xff;
588         addr    = ntohl(naddr);
589         buf[4]  = 0xff;
590         buf[5]  = 0x10 | scope; /* scope from broadcast address */
591         buf[6]  = 0x40;         /* IPv4 signature */
592         buf[7]  = 0x1b;
593         buf[8]  = broadcast[8];         /* P_Key */
594         buf[9]  = broadcast[9];
595         buf[10] = 0;
596         buf[11] = 0;
597         buf[12] = 0;
598         buf[13] = 0;
599         buf[14] = 0;
600         buf[15] = 0;
601         buf[19] = addr & 0xff;
602         addr  >>= 8;
603         buf[18] = addr & 0xff;
604         addr  >>= 8;
605         buf[17] = addr & 0xff;
606         addr  >>= 8;
607         buf[16] = addr & 0x0f;
608 }
609 
610 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
611 {
612         if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
613                 memcpy(buf, broadcast, 4);
614         else
615                 memcpy(buf, &naddr, sizeof(naddr));
616 }
617 
618 #if IS_ENABLED(CONFIG_IPV6)
619 #include <linux/ipv6.h>
620 #endif
621 
622 static __inline__ void inet_reset_saddr(struct sock *sk)
623 {
624         inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
625 #if IS_ENABLED(CONFIG_IPV6)
626         if (sk->sk_family == PF_INET6) {
627                 struct ipv6_pinfo *np = inet6_sk(sk);
628 
629                 memset(&np->saddr, 0, sizeof(np->saddr));
630                 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
631         }
632 #endif
633 }
634 
635 #endif
636 
637 static inline unsigned int ipv4_addr_hash(__be32 ip)
638 {
639         return (__force unsigned int) ip;
640 }
641 
642 static inline u32 ipv4_portaddr_hash(const struct net *net,
643                                      __be32 saddr,
644                                      unsigned int port)
645 {
646         return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
647 }
648 
649 bool ip_call_ra_chain(struct sk_buff *skb);
650 
651 /*
652  *      Functions provided by ip_fragment.c
653  */
654 
655 enum ip_defrag_users {
656         IP_DEFRAG_LOCAL_DELIVER,
657         IP_DEFRAG_CALL_RA_CHAIN,
658         IP_DEFRAG_CONNTRACK_IN,
659         __IP_DEFRAG_CONNTRACK_IN_END    = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
660         IP_DEFRAG_CONNTRACK_OUT,
661         __IP_DEFRAG_CONNTRACK_OUT_END   = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
662         IP_DEFRAG_CONNTRACK_BRIDGE_IN,
663         __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
664         IP_DEFRAG_VS_IN,
665         IP_DEFRAG_VS_OUT,
666         IP_DEFRAG_VS_FWD,
667         IP_DEFRAG_AF_PACKET,
668         IP_DEFRAG_MACVLAN,
669 };
670 
671 /* Return true if the value of 'user' is between 'lower_bond'
672  * and 'upper_bond' inclusively.
673  */
674 static inline bool ip_defrag_user_in_between(u32 user,
675                                              enum ip_defrag_users lower_bond,
676                                              enum ip_defrag_users upper_bond)
677 {
678         return user >= lower_bond && user <= upper_bond;
679 }
680 
681 int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
682 #ifdef CONFIG_INET
683 struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
684 #else
685 static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
686 {
687         return skb;
688 }
689 #endif
690 
691 /*
692  *      Functions provided by ip_forward.c
693  */
694 
695 int ip_forward(struct sk_buff *skb);
696 
697 /*
698  *      Functions provided by ip_options.c
699  */
700 
701 void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
702                       __be32 daddr, struct rtable *rt, int is_frag);
703 
704 int __ip_options_echo(struct net *net, struct ip_options *dopt,
705                       struct sk_buff *skb, const struct ip_options *sopt);
706 static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
707                                   struct sk_buff *skb)
708 {
709         return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
710 }
711 
712 void ip_options_fragment(struct sk_buff *skb);
713 int __ip_options_compile(struct net *net, struct ip_options *opt,
714                          struct sk_buff *skb, __be32 *info);
715 int ip_options_compile(struct net *net, struct ip_options *opt,
716                        struct sk_buff *skb);
717 int ip_options_get(struct net *net, struct ip_options_rcu **optp,
718                    unsigned char *data, int optlen);
719 int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
720                              unsigned char __user *data, int optlen);
721 void ip_options_undo(struct ip_options *opt);
722 void ip_forward_options(struct sk_buff *skb);
723 int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
724 
725 /*
726  *      Functions provided by ip_sockglue.c
727  */
728 
729 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
730 void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
731                          struct sk_buff *skb, int tlen, int offset);
732 int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
733                  struct ipcm_cookie *ipc, bool allow_ipv6);
734 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
735                   unsigned int optlen);
736 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
737                   int __user *optlen);
738 int compat_ip_setsockopt(struct sock *sk, int level, int optname,
739                          char __user *optval, unsigned int optlen);
740 int compat_ip_getsockopt(struct sock *sk, int level, int optname,
741                          char __user *optval, int __user *optlen);
742 int ip_ra_control(struct sock *sk, unsigned char on,
743                   void (*destructor)(struct sock *));
744 
745 int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
746 void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
747                    u32 info, u8 *payload);
748 void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
749                     u32 info);
750 
751 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
752 {
753         ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
754 }
755 
756 bool icmp_global_allow(void);
757 extern int sysctl_icmp_msgs_per_sec;
758 extern int sysctl_icmp_msgs_burst;
759 
760 #ifdef CONFIG_PROC_FS
761 int ip_misc_proc_init(void);
762 #endif
763 
764 int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
765                                 struct netlink_ext_ack *extack);
766 
767 static inline bool inetdev_valid_mtu(unsigned int mtu)
768 {
769         return likely(mtu >= IPV4_MIN_MTU);
770 }
771 
772 #endif  /* _IP_H */
773 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp