route.h 5.4 KB

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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 router.
  7. *
  8. * Version: @(#)route.h 1.0.4 05/27/93
  9. *
  10. * Authors: Ross Biro
  11. * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  12. * Fixes:
  13. * Alan Cox : Reformatted. Added ip_rt_local()
  14. * Alan Cox : Support for TCP parameters.
  15. * Alexey Kuznetsov: Major changes for new routing code.
  16. * Mike McLagan : Routing by source
  17. * Robert Olsson : Added rt_cache statistics
  18. *
  19. * This program is free software; you can redistribute it and/or
  20. * modify it under the terms of the GNU General Public License
  21. * as published by the Free Software Foundation; either version
  22. * 2 of the License, or (at your option) any later version.
  23. */
  24. #ifndef _ROUTE_H
  25. #define _ROUTE_H
  26. #include <net/dst.h>
  27. #include <net/inetpeer.h>
  28. #include <net/flow.h>
  29. #include <linux/in_route.h>
  30. #include <linux/rtnetlink.h>
  31. #include <linux/route.h>
  32. #include <linux/ip.h>
  33. #include <linux/cache.h>
  34. #include <linux/security.h>
  35. #ifndef __KERNEL__
  36. #warning This file is not supposed to be used outside of kernel.
  37. #endif
  38. #define RTO_ONLINK 0x01
  39. #define RTO_CONN 0
  40. /* RTO_CONN is not used (being alias for 0), but preserved not to break
  41. * some modules referring to it. */
  42. #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
  43. struct fib_nh;
  44. struct inet_peer;
  45. struct rtable
  46. {
  47. union
  48. {
  49. struct dst_entry dst;
  50. } u;
  51. /* Cache lookup keys */
  52. struct flowi fl;
  53. struct in_device *idev;
  54. unsigned rt_flags;
  55. __u16 rt_type;
  56. __u16 rt_multipath_alg;
  57. __be32 rt_dst; /* Path destination */
  58. __be32 rt_src; /* Path source */
  59. int rt_iif;
  60. /* Info on neighbour */
  61. __be32 rt_gateway;
  62. /* Miscellaneous cached information */
  63. __be32 rt_spec_dst; /* RFC1122 specific destination */
  64. struct inet_peer *peer; /* long-living peer info */
  65. };
  66. struct ip_rt_acct
  67. {
  68. __u32 o_bytes;
  69. __u32 o_packets;
  70. __u32 i_bytes;
  71. __u32 i_packets;
  72. };
  73. struct rt_cache_stat
  74. {
  75. unsigned int in_hit;
  76. unsigned int in_slow_tot;
  77. unsigned int in_slow_mc;
  78. unsigned int in_no_route;
  79. unsigned int in_brd;
  80. unsigned int in_martian_dst;
  81. unsigned int in_martian_src;
  82. unsigned int out_hit;
  83. unsigned int out_slow_tot;
  84. unsigned int out_slow_mc;
  85. unsigned int gc_total;
  86. unsigned int gc_ignored;
  87. unsigned int gc_goal_miss;
  88. unsigned int gc_dst_overflow;
  89. unsigned int in_hlist_search;
  90. unsigned int out_hlist_search;
  91. };
  92. extern struct ip_rt_acct *ip_rt_acct;
  93. struct in_device;
  94. extern int ip_rt_init(void);
  95. extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
  96. __be32 src, struct net_device *dev);
  97. extern void ip_rt_advice(struct rtable **rp, int advice);
  98. extern void rt_cache_flush(int how);
  99. extern int __ip_route_output_key(struct rtable **, const struct flowi *flp);
  100. extern int ip_route_output_key(struct rtable **, struct flowi *flp);
  101. extern int ip_route_output_flow(struct rtable **rp, struct flowi *flp, struct sock *sk, int flags);
  102. extern int ip_route_input(struct sk_buff*, __be32 dst, __be32 src, u8 tos, struct net_device *devin);
  103. extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu);
  104. extern void ip_rt_send_redirect(struct sk_buff *skb);
  105. extern unsigned inet_addr_type(__be32 addr);
  106. extern void ip_rt_multicast_event(struct in_device *);
  107. extern int ip_rt_ioctl(unsigned int cmd, void __user *arg);
  108. extern void ip_rt_get_source(u8 *src, struct rtable *rt);
  109. extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
  110. struct in_ifaddr;
  111. extern void fib_add_ifaddr(struct in_ifaddr *);
  112. static inline void ip_rt_put(struct rtable * rt)
  113. {
  114. if (rt)
  115. dst_release(&rt->u.dst);
  116. }
  117. #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
  118. extern __u8 ip_tos2prio[16];
  119. static inline char rt_tos2priority(u8 tos)
  120. {
  121. return ip_tos2prio[IPTOS_TOS(tos)>>1];
  122. }
  123. static inline int ip_route_connect(struct rtable **rp, __be32 dst,
  124. __be32 src, u32 tos, int oif, u8 protocol,
  125. __be16 sport, __be16 dport, struct sock *sk,
  126. int flags)
  127. {
  128. struct flowi fl = { .oif = oif,
  129. .nl_u = { .ip4_u = { .daddr = dst,
  130. .saddr = src,
  131. .tos = tos } },
  132. .proto = protocol,
  133. .uli_u = { .ports =
  134. { .sport = sport,
  135. .dport = dport } } };
  136. int err;
  137. if (!dst || !src) {
  138. err = __ip_route_output_key(rp, &fl);
  139. if (err)
  140. return err;
  141. fl.fl4_dst = (*rp)->rt_dst;
  142. fl.fl4_src = (*rp)->rt_src;
  143. ip_rt_put(*rp);
  144. *rp = NULL;
  145. }
  146. security_sk_classify_flow(sk, &fl);
  147. return ip_route_output_flow(rp, &fl, sk, flags);
  148. }
  149. static inline int ip_route_newports(struct rtable **rp, u8 protocol,
  150. __be16 sport, __be16 dport, struct sock *sk)
  151. {
  152. if (sport != (*rp)->fl.fl_ip_sport ||
  153. dport != (*rp)->fl.fl_ip_dport) {
  154. struct flowi fl;
  155. memcpy(&fl, &(*rp)->fl, sizeof(fl));
  156. fl.fl_ip_sport = sport;
  157. fl.fl_ip_dport = dport;
  158. fl.proto = protocol;
  159. ip_rt_put(*rp);
  160. *rp = NULL;
  161. security_sk_classify_flow(sk, &fl);
  162. return ip_route_output_flow(rp, &fl, sk, 0);
  163. }
  164. return 0;
  165. }
  166. extern void rt_bind_peer(struct rtable *rt, int create);
  167. static inline struct inet_peer *rt_get_peer(struct rtable *rt)
  168. {
  169. if (rt->peer)
  170. return rt->peer;
  171. rt_bind_peer(rt, 0);
  172. return rt->peer;
  173. }
  174. extern ctl_table ipv4_route_table[];
  175. #endif /* _ROUTE_H */