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/include/net/ip.h

https://gitlab.com/Krzyzanowski_Pawel/biosignal_gen
C Header | 463 lines | 341 code | 66 blank | 56 comment | 14 complexity | f92b75f2e934946c3c860d0afc97e1ab MD5 | raw file
  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. #include <linux/types.h>
  25. #include <linux/ip.h>
  26. #include <linux/in.h>
  27. #include <linux/skbuff.h>
  28. #include <net/inet_sock.h>
  29. #include <net/snmp.h>
  30. #include <net/flow.h>
  31. struct sock;
  32. struct inet_skb_parm {
  33. struct ip_options opt; /* Compiled IP options */
  34. unsigned char flags;
  35. #define IPSKB_FORWARDED 1
  36. #define IPSKB_XFRM_TUNNEL_SIZE 2
  37. #define IPSKB_XFRM_TRANSFORMED 4
  38. #define IPSKB_FRAG_COMPLETE 8
  39. #define IPSKB_REROUTED 16
  40. u16 frag_max_size;
  41. };
  42. static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
  43. {
  44. return ip_hdr(skb)->ihl * 4;
  45. }
  46. struct ipcm_cookie {
  47. __be32 addr;
  48. int oif;
  49. struct ip_options_rcu *opt;
  50. __u8 tx_flags;
  51. };
  52. #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
  53. struct ip_ra_chain {
  54. struct ip_ra_chain __rcu *next;
  55. struct sock *sk;
  56. union {
  57. void (*destructor)(struct sock *);
  58. struct sock *saved_sk;
  59. };
  60. struct rcu_head rcu;
  61. };
  62. extern struct ip_ra_chain __rcu *ip_ra_chain;
  63. /* IP flags. */
  64. #define IP_CE 0x8000 /* Flag: "Congestion" */
  65. #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
  66. #define IP_MF 0x2000 /* Flag: "More Fragments" */
  67. #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
  68. #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
  69. struct msghdr;
  70. struct net_device;
  71. struct packet_type;
  72. struct rtable;
  73. struct sockaddr;
  74. extern int igmp_mc_proc_init(void);
  75. /*
  76. * Functions provided by ip.c
  77. */
  78. extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
  79. __be32 saddr, __be32 daddr,
  80. struct ip_options_rcu *opt);
  81. extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
  82. struct packet_type *pt, struct net_device *orig_dev);
  83. extern int ip_local_deliver(struct sk_buff *skb);
  84. extern int ip_mr_input(struct sk_buff *skb);
  85. extern int ip_output(struct sk_buff *skb);
  86. extern int ip_mc_output(struct sk_buff *skb);
  87. extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
  88. extern int ip_do_nat(struct sk_buff *skb);
  89. extern void ip_send_check(struct iphdr *ip);
  90. extern int __ip_local_out(struct sk_buff *skb);
  91. extern int ip_local_out(struct sk_buff *skb);
  92. extern int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
  93. extern void ip_init(void);
  94. extern int ip_append_data(struct sock *sk, struct flowi4 *fl4,
  95. int getfrag(void *from, char *to, int offset, int len,
  96. int odd, struct sk_buff *skb),
  97. void *from, int len, int protolen,
  98. struct ipcm_cookie *ipc,
  99. struct rtable **rt,
  100. unsigned int flags);
  101. extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
  102. extern ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
  103. int offset, size_t size, int flags);
  104. extern struct sk_buff *__ip_make_skb(struct sock *sk,
  105. struct flowi4 *fl4,
  106. struct sk_buff_head *queue,
  107. struct inet_cork *cork);
  108. extern int ip_send_skb(struct net *net, struct sk_buff *skb);
  109. extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
  110. extern void ip_flush_pending_frames(struct sock *sk);
  111. extern struct sk_buff *ip_make_skb(struct sock *sk,
  112. struct flowi4 *fl4,
  113. int getfrag(void *from, char *to, int offset, int len,
  114. int odd, struct sk_buff *skb),
  115. void *from, int length, int transhdrlen,
  116. struct ipcm_cookie *ipc,
  117. struct rtable **rtp,
  118. unsigned int flags);
  119. static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
  120. {
  121. return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
  122. }
  123. /* datagram.c */
  124. extern int ip4_datagram_connect(struct sock *sk,
  125. struct sockaddr *uaddr, int addr_len);
  126. extern void ip4_datagram_release_cb(struct sock *sk);
  127. struct ip_reply_arg {
  128. struct kvec iov[1];
  129. int flags;
  130. __wsum csum;
  131. int csumoffset; /* u16 offset of csum in iov[0].iov_base */
  132. /* -1 if not needed */
  133. int bound_dev_if;
  134. u8 tos;
  135. };
  136. #define IP_REPLY_ARG_NOSRCCHECK 1
  137. static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
  138. {
  139. return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
  140. }
  141. void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
  142. __be32 saddr, const struct ip_reply_arg *arg,
  143. unsigned int len);
  144. struct ipv4_config {
  145. int log_martians;
  146. int no_pmtu_disc;
  147. };
  148. extern struct ipv4_config ipv4_config;
  149. #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
  150. #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
  151. #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
  152. #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
  153. #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
  154. #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
  155. #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
  156. #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
  157. #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
  158. #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
  159. #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
  160. extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
  161. #if BITS_PER_LONG==32
  162. extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
  163. #else
  164. static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
  165. {
  166. return snmp_fold_field(mib, offt);
  167. }
  168. #endif
  169. extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
  170. extern void snmp_mib_free(void __percpu *ptr[2]);
  171. extern struct local_ports {
  172. seqlock_t lock;
  173. int range[2];
  174. } sysctl_local_ports;
  175. extern void inet_get_local_port_range(int *low, int *high);
  176. extern unsigned long *sysctl_local_reserved_ports;
  177. static inline int inet_is_reserved_local_port(int port)
  178. {
  179. return test_bit(port, sysctl_local_reserved_ports);
  180. }
  181. extern int sysctl_ip_nonlocal_bind;
  182. /* From inetpeer.c */
  183. extern int inet_peer_threshold;
  184. extern int inet_peer_minttl;
  185. extern int inet_peer_maxttl;
  186. /* From ip_input.c */
  187. extern int sysctl_ip_early_demux;
  188. /* From ip_output.c */
  189. extern int sysctl_ip_dynaddr;
  190. extern void ipfrag_init(void);
  191. extern void ip_static_sysctl_init(void);
  192. static inline bool ip_is_fragment(const struct iphdr *iph)
  193. {
  194. return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
  195. }
  196. #ifdef CONFIG_INET
  197. #include <net/dst.h>
  198. /* The function in 2.2 was invalid, producing wrong result for
  199. * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
  200. static inline
  201. int ip_decrease_ttl(struct iphdr *iph)
  202. {
  203. u32 check = (__force u32)iph->check;
  204. check += (__force u32)htons(0x0100);
  205. iph->check = (__force __sum16)(check + (check>=0xFFFF));
  206. return --iph->ttl;
  207. }
  208. static inline
  209. int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
  210. {
  211. return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
  212. (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
  213. !(dst_metric_locked(dst, RTAX_MTU)));
  214. }
  215. extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
  216. static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
  217. {
  218. if (iph->frag_off & htons(IP_DF)) {
  219. /* This is only to work around buggy Windows95/2000
  220. * VJ compression implementations. If the ID field
  221. * does not change, they drop every other packet in
  222. * a TCP stream using header compression.
  223. */
  224. iph->id = (sk && inet_sk(sk)->inet_daddr) ?
  225. htons(inet_sk(sk)->inet_id++) : 0;
  226. } else
  227. __ip_select_ident(iph, dst, 0);
  228. }
  229. static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more)
  230. {
  231. if (iph->frag_off & htons(IP_DF)) {
  232. if (sk && inet_sk(sk)->inet_daddr) {
  233. iph->id = htons(inet_sk(sk)->inet_id);
  234. inet_sk(sk)->inet_id += 1 + more;
  235. } else
  236. iph->id = 0;
  237. } else
  238. __ip_select_ident(iph, dst, more);
  239. }
  240. /*
  241. * Map a multicast IP onto multicast MAC for type ethernet.
  242. */
  243. static inline void ip_eth_mc_map(__be32 naddr, char *buf)
  244. {
  245. __u32 addr=ntohl(naddr);
  246. buf[0]=0x01;
  247. buf[1]=0x00;
  248. buf[2]=0x5e;
  249. buf[5]=addr&0xFF;
  250. addr>>=8;
  251. buf[4]=addr&0xFF;
  252. addr>>=8;
  253. buf[3]=addr&0x7F;
  254. }
  255. /*
  256. * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
  257. * Leave P_Key as 0 to be filled in by driver.
  258. */
  259. static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
  260. {
  261. __u32 addr;
  262. unsigned char scope = broadcast[5] & 0xF;
  263. buf[0] = 0; /* Reserved */
  264. buf[1] = 0xff; /* Multicast QPN */
  265. buf[2] = 0xff;
  266. buf[3] = 0xff;
  267. addr = ntohl(naddr);
  268. buf[4] = 0xff;
  269. buf[5] = 0x10 | scope; /* scope from broadcast address */
  270. buf[6] = 0x40; /* IPv4 signature */
  271. buf[7] = 0x1b;
  272. buf[8] = broadcast[8]; /* P_Key */
  273. buf[9] = broadcast[9];
  274. buf[10] = 0;
  275. buf[11] = 0;
  276. buf[12] = 0;
  277. buf[13] = 0;
  278. buf[14] = 0;
  279. buf[15] = 0;
  280. buf[19] = addr & 0xff;
  281. addr >>= 8;
  282. buf[18] = addr & 0xff;
  283. addr >>= 8;
  284. buf[17] = addr & 0xff;
  285. addr >>= 8;
  286. buf[16] = addr & 0x0f;
  287. }
  288. static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
  289. {
  290. if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
  291. memcpy(buf, broadcast, 4);
  292. else
  293. memcpy(buf, &naddr, sizeof(naddr));
  294. }
  295. #if IS_ENABLED(CONFIG_IPV6)
  296. #include <linux/ipv6.h>
  297. #endif
  298. static __inline__ void inet_reset_saddr(struct sock *sk)
  299. {
  300. inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
  301. #if IS_ENABLED(CONFIG_IPV6)
  302. if (sk->sk_family == PF_INET6) {
  303. struct ipv6_pinfo *np = inet6_sk(sk);
  304. memset(&np->saddr, 0, sizeof(np->saddr));
  305. memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
  306. }
  307. #endif
  308. }
  309. #endif
  310. static inline int sk_mc_loop(struct sock *sk)
  311. {
  312. if (!sk)
  313. return 1;
  314. switch (sk->sk_family) {
  315. case AF_INET:
  316. return inet_sk(sk)->mc_loop;
  317. #if IS_ENABLED(CONFIG_IPV6)
  318. case AF_INET6:
  319. return inet6_sk(sk)->mc_loop;
  320. #endif
  321. }
  322. WARN_ON(1);
  323. return 1;
  324. }
  325. extern bool ip_call_ra_chain(struct sk_buff *skb);
  326. /*
  327. * Functions provided by ip_fragment.c
  328. */
  329. enum ip_defrag_users {
  330. IP_DEFRAG_LOCAL_DELIVER,
  331. IP_DEFRAG_CALL_RA_CHAIN,
  332. IP_DEFRAG_CONNTRACK_IN,
  333. __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
  334. IP_DEFRAG_CONNTRACK_OUT,
  335. __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
  336. IP_DEFRAG_CONNTRACK_BRIDGE_IN,
  337. __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
  338. IP_DEFRAG_VS_IN,
  339. IP_DEFRAG_VS_OUT,
  340. IP_DEFRAG_VS_FWD,
  341. IP_DEFRAG_AF_PACKET,
  342. IP_DEFRAG_MACVLAN,
  343. };
  344. int ip_defrag(struct sk_buff *skb, u32 user);
  345. #ifdef CONFIG_INET
  346. struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
  347. #else
  348. static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
  349. {
  350. return skb;
  351. }
  352. #endif
  353. int ip_frag_mem(struct net *net);
  354. int ip_frag_nqueues(struct net *net);
  355. /*
  356. * Functions provided by ip_forward.c
  357. */
  358. extern int ip_forward(struct sk_buff *skb);
  359. /*
  360. * Functions provided by ip_options.c
  361. */
  362. extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
  363. __be32 daddr, struct rtable *rt, int is_frag);
  364. extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
  365. extern void ip_options_fragment(struct sk_buff *skb);
  366. extern int ip_options_compile(struct net *net,
  367. struct ip_options *opt, struct sk_buff *skb);
  368. extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
  369. unsigned char *data, int optlen);
  370. extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
  371. unsigned char __user *data, int optlen);
  372. extern void ip_options_undo(struct ip_options * opt);
  373. extern void ip_forward_options(struct sk_buff *skb);
  374. extern int ip_options_rcv_srr(struct sk_buff *skb);
  375. /*
  376. * Functions provided by ip_sockglue.c
  377. */
  378. extern void ipv4_pktinfo_prepare(struct sk_buff *skb);
  379. extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
  380. extern int ip_cmsg_send(struct net *net,
  381. struct msghdr *msg, struct ipcm_cookie *ipc);
  382. extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
  383. extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
  384. extern int compat_ip_setsockopt(struct sock *sk, int level,
  385. int optname, char __user *optval, unsigned int optlen);
  386. extern int compat_ip_getsockopt(struct sock *sk, int level,
  387. int optname, char __user *optval, int __user *optlen);
  388. extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
  389. extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
  390. extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
  391. __be16 port, u32 info, u8 *payload);
  392. extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
  393. u32 info);
  394. #ifdef CONFIG_PROC_FS
  395. extern int ip_misc_proc_init(void);
  396. #endif
  397. #endif /* _IP_H */