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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
36struct sock;
37
38struct inet_skb_parm {
39 struct ip_options opt;
40 unsigned char flags;
41
42#define IPSKB_FORWARDED BIT(0)
43#define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
44#define IPSKB_XFRM_TRANSFORMED BIT(2)
45#define IPSKB_FRAG_COMPLETE BIT(3)
46#define IPSKB_REROUTED BIT(4)
47#define IPSKB_DOREDIRECT BIT(5)
48#define IPSKB_FRAG_PMTU BIT(6)
49
50 u16 frag_max_size;
51};
52
53static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
54{
55 return ip_hdr(skb)->ihl * 4;
56}
57
58struct ipcm_cookie {
59 __be32 addr;
60 int oif;
61 struct ip_options_rcu *opt;
62 __u8 tx_flags;
63 __u8 ttl;
64 __s16 tos;
65 char priority;
66};
67
68#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
69#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
70
71struct ip_ra_chain {
72 struct ip_ra_chain __rcu *next;
73 struct sock *sk;
74 union {
75 void (*destructor)(struct sock *);
76 struct sock *saved_sk;
77 };
78 struct rcu_head rcu;
79};
80
81extern struct ip_ra_chain __rcu *ip_ra_chain;
82
83
84#define IP_CE 0x8000
85#define IP_DF 0x4000
86#define IP_MF 0x2000
87#define IP_OFFSET 0x1FFF
88
89#define IP_FRAG_TIME (30 * HZ)
90
91struct msghdr;
92struct net_device;
93struct packet_type;
94struct rtable;
95struct sockaddr;
96
97int igmp_mc_init(void);
98
99
100
101
102
103int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
104 __be32 saddr, __be32 daddr,
105 struct ip_options_rcu *opt);
106int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
107 struct net_device *orig_dev);
108int ip_local_deliver(struct sk_buff *skb);
109int ip_mr_input(struct sk_buff *skb);
110int ip_output(struct sock *sk, struct sk_buff *skb);
111int ip_mc_output(struct sock *sk, struct sk_buff *skb);
112int ip_do_fragment(struct sock *sk, struct sk_buff *skb,
113 int (*output)(struct sock *, struct sk_buff *));
114void ip_send_check(struct iphdr *ip);
115int __ip_local_out(struct sk_buff *skb);
116int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
117static inline int ip_local_out(struct sk_buff *skb)
118{
119 return ip_local_out_sk(skb->sk, skb);
120}
121
122int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
123void ip_init(void);
124int ip_append_data(struct sock *sk, struct flowi4 *fl4,
125 int getfrag(void *from, char *to, int offset, int len,
126 int odd, struct sk_buff *skb),
127 void *from, int len, int protolen,
128 struct ipcm_cookie *ipc,
129 struct rtable **rt,
130 unsigned int flags);
131int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
132 struct sk_buff *skb);
133ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
134 int offset, size_t size, int flags);
135struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
136 struct sk_buff_head *queue,
137 struct inet_cork *cork);
138int ip_send_skb(struct net *net, struct sk_buff *skb);
139int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
140void ip_flush_pending_frames(struct sock *sk);
141struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
142 int getfrag(void *from, char *to, int offset,
143 int len, int odd, struct sk_buff *skb),
144 void *from, int length, int transhdrlen,
145 struct ipcm_cookie *ipc, struct rtable **rtp,
146 unsigned int flags);
147
148static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
149{
150 return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
151}
152
153static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
154{
155 return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
156}
157
158static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
159{
160 return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
161}
162
163
164int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
165int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
166
167void ip4_datagram_release_cb(struct sock *sk);
168
169struct ip_reply_arg {
170 struct kvec iov[1];
171 int flags;
172 __wsum csum;
173 int csumoffset;
174
175 int bound_dev_if;
176 u8 tos;
177};
178
179#define IP_REPLY_ARG_NOSRCCHECK 1
180
181static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
182{
183 return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
184}
185
186void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
187 const struct ip_options *sopt,
188 __be32 daddr, __be32 saddr,
189 const struct ip_reply_arg *arg,
190 unsigned int len);
191
192#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
193#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
194#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
195#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
196#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
197#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
198#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
199#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
200#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
201#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
202#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
203#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
204
205u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
206unsigned long snmp_fold_field(void __percpu *mib, int offt);
207#if BITS_PER_LONG==32
208u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
209 size_t syncp_offset);
210u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
211#else
212static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
213 size_t syncp_offset)
214{
215 return snmp_get_cpu_field(mib, cpu, offct);
216
217}
218
219static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
220{
221 return snmp_fold_field(mib, offt);
222}
223#endif
224
225void inet_get_local_port_range(struct net *net, int *low, int *high);
226
227#ifdef CONFIG_SYSCTL
228static inline int inet_is_local_reserved_port(struct net *net, int port)
229{
230 if (!net->ipv4.sysctl_local_reserved_ports)
231 return 0;
232 return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
233}
234
235static inline bool sysctl_dev_name_is_allowed(const char *name)
236{
237 return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
238}
239
240#else
241static inline int inet_is_local_reserved_port(struct net *net, int port)
242{
243 return 0;
244}
245#endif
246
247
248extern int inet_peer_threshold;
249extern int inet_peer_minttl;
250extern int inet_peer_maxttl;
251
252
253extern int sysctl_ip_early_demux;
254
255
256extern int sysctl_ip_dynaddr;
257
258void ipfrag_init(void);
259
260void ip_static_sysctl_init(void);
261
262#define IP4_REPLY_MARK(net, mark) \
263 ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
264
265static inline bool ip_is_fragment(const struct iphdr *iph)
266{
267 return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
268}
269
270#ifdef CONFIG_INET
271#include <net/dst.h>
272
273
274
275static inline
276int ip_decrease_ttl(struct iphdr *iph)
277{
278 u32 check = (__force u32)iph->check;
279 check += (__force u32)htons(0x0100);
280 iph->check = (__force __sum16)(check + (check>=0xFFFF));
281 return --iph->ttl;
282}
283
284static inline
285int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
286{
287 return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
288 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
289 !(dst_metric_locked(dst, RTAX_MTU)));
290}
291
292static inline bool ip_sk_accept_pmtu(const struct sock *sk)
293{
294 return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
295 inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
296}
297
298static inline bool ip_sk_use_pmtu(const struct sock *sk)
299{
300 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
301}
302
303static inline bool ip_sk_ignore_df(const struct sock *sk)
304{
305 return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
306 inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
307}
308
309static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
310 bool forwarding)
311{
312 struct net *net = dev_net(dst->dev);
313
314 if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
315 dst_metric_locked(dst, RTAX_MTU) ||
316 !forwarding)
317 return dst_mtu(dst);
318
319 return min(dst->dev->mtu, IP_MAX_MTU);
320}
321
322static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb)
323{
324 if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
325 bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
326 return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
327 } else {
328 return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
329 }
330}
331
332u32 ip_idents_reserve(u32 hash, int segs);
333void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
334
335static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
336 struct sock *sk, int segs)
337{
338 struct iphdr *iph = ip_hdr(skb);
339
340 if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
341
342
343
344
345
346 if (sk && inet_sk(sk)->inet_daddr) {
347 iph->id = htons(inet_sk(sk)->inet_id);
348 inet_sk(sk)->inet_id += segs;
349 } else {
350 iph->id = 0;
351 }
352 } else {
353 __ip_select_ident(net, iph, segs);
354 }
355}
356
357static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
358 struct sock *sk)
359{
360 ip_select_ident_segs(net, skb, sk, 1);
361}
362
363static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
364{
365 return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
366 skb->len, proto, 0);
367}
368
369
370
371
372
373static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
374 const struct iphdr *iph)
375{
376 BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
377 offsetof(typeof(flow->addrs), v4addrs.src) +
378 sizeof(flow->addrs.v4addrs.src));
379 memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
380 flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
381}
382
383static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
384{
385 const struct iphdr *iph = skb_gro_network_header(skb);
386
387 return csum_tcpudp_nofold(iph->saddr, iph->daddr,
388 skb_gro_len(skb), proto, 0);
389}
390
391
392
393
394
395static inline void ip_eth_mc_map(__be32 naddr, char *buf)
396{
397 __u32 addr=ntohl(naddr);
398 buf[0]=0x01;
399 buf[1]=0x00;
400 buf[2]=0x5e;
401 buf[5]=addr&0xFF;
402 addr>>=8;
403 buf[4]=addr&0xFF;
404 addr>>=8;
405 buf[3]=addr&0x7F;
406}
407
408
409
410
411
412
413static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
414{
415 __u32 addr;
416 unsigned char scope = broadcast[5] & 0xF;
417
418 buf[0] = 0;
419 buf[1] = 0xff;
420 buf[2] = 0xff;
421 buf[3] = 0xff;
422 addr = ntohl(naddr);
423 buf[4] = 0xff;
424 buf[5] = 0x10 | scope;
425 buf[6] = 0x40;
426 buf[7] = 0x1b;
427 buf[8] = broadcast[8];
428 buf[9] = broadcast[9];
429 buf[10] = 0;
430 buf[11] = 0;
431 buf[12] = 0;
432 buf[13] = 0;
433 buf[14] = 0;
434 buf[15] = 0;
435 buf[19] = addr & 0xff;
436 addr >>= 8;
437 buf[18] = addr & 0xff;
438 addr >>= 8;
439 buf[17] = addr & 0xff;
440 addr >>= 8;
441 buf[16] = addr & 0x0f;
442}
443
444static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
445{
446 if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
447 memcpy(buf, broadcast, 4);
448 else
449 memcpy(buf, &naddr, sizeof(naddr));
450}
451
452#if IS_ENABLED(CONFIG_IPV6)
453#include <linux/ipv6.h>
454#endif
455
456static __inline__ void inet_reset_saddr(struct sock *sk)
457{
458 inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
459#if IS_ENABLED(CONFIG_IPV6)
460 if (sk->sk_family == PF_INET6) {
461 struct ipv6_pinfo *np = inet6_sk(sk);
462
463 memset(&np->saddr, 0, sizeof(np->saddr));
464 memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
465 }
466#endif
467}
468
469#endif
470
471static inline unsigned int ipv4_addr_hash(__be32 ip)
472{
473 return (__force unsigned int) ip;
474}
475
476bool ip_call_ra_chain(struct sk_buff *skb);
477
478
479
480
481
482enum ip_defrag_users {
483 IP_DEFRAG_LOCAL_DELIVER,
484 IP_DEFRAG_CALL_RA_CHAIN,
485 IP_DEFRAG_CONNTRACK_IN,
486 __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
487 IP_DEFRAG_CONNTRACK_OUT,
488 __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
489 IP_DEFRAG_CONNTRACK_BRIDGE_IN,
490 __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
491 IP_DEFRAG_VS_IN,
492 IP_DEFRAG_VS_OUT,
493 IP_DEFRAG_VS_FWD,
494 IP_DEFRAG_AF_PACKET,
495 IP_DEFRAG_MACVLAN,
496};
497
498
499
500
501static inline bool ip_defrag_user_in_between(u32 user,
502 enum ip_defrag_users lower_bond,
503 enum ip_defrag_users upper_bond)
504{
505 return user >= lower_bond && user <= upper_bond;
506}
507
508int ip_defrag(struct sk_buff *skb, u32 user);
509#ifdef CONFIG_INET
510struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
511#else
512static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
513{
514 return skb;
515}
516#endif
517int ip_frag_mem(struct net *net);
518
519
520
521
522
523int ip_forward(struct sk_buff *skb);
524
525
526
527
528
529void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
530 __be32 daddr, struct rtable *rt, int is_frag);
531
532int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb,
533 const struct ip_options *sopt);
534static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb)
535{
536 return __ip_options_echo(dopt, skb, &IPCB(skb)->opt);
537}
538
539void ip_options_fragment(struct sk_buff *skb);
540int ip_options_compile(struct net *net, struct ip_options *opt,
541 struct sk_buff *skb);
542int ip_options_get(struct net *net, struct ip_options_rcu **optp,
543 unsigned char *data, int optlen);
544int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
545 unsigned char __user *data, int optlen);
546void ip_options_undo(struct ip_options *opt);
547void ip_forward_options(struct sk_buff *skb);
548int ip_options_rcv_srr(struct sk_buff *skb);
549
550
551
552
553
554void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
555void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset);
556int ip_cmsg_send(struct net *net, struct msghdr *msg,
557 struct ipcm_cookie *ipc, bool allow_ipv6);
558int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
559 unsigned int optlen);
560int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
561 int __user *optlen);
562int compat_ip_setsockopt(struct sock *sk, int level, int optname,
563 char __user *optval, unsigned int optlen);
564int compat_ip_getsockopt(struct sock *sk, int level, int optname,
565 char __user *optval, int __user *optlen);
566int ip_ra_control(struct sock *sk, unsigned char on,
567 void (*destructor)(struct sock *));
568
569int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
570void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
571 u32 info, u8 *payload);
572void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
573 u32 info);
574
575static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
576{
577 ip_cmsg_recv_offset(msg, skb, 0);
578}
579
580bool icmp_global_allow(void);
581extern int sysctl_icmp_msgs_per_sec;
582extern int sysctl_icmp_msgs_burst;
583
584#ifdef CONFIG_PROC_FS
585int ip_misc_proc_init(void);
586#endif
587
588#endif
589
