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