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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the IP router. * * Version: @(#)route.h 1.0.4 05/27/93 * * Authors: Ross Biro, <bir7@leland.Stanford.Edu> * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Fixes: * Alan Cox : Reformatted. Added ip_rt_local() * Alan Cox : Support for TCP parameters. * Alexey Kuznetsov: Major changes for new routing code. * Mike McLagan : Routing by source * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _ROUTE_H #define _ROUTE_H #include <linux/config.h> #include <net/dst.h> #include <linux/in_route.h> #include <linux/rtnetlink.h> #include <linux/route.h> #ifndef __KERNEL__ #warning This file is not supposed to be used outside of kernel. #endif #define RT_HASH_DIVISOR 256 /* * Prevents LRU trashing, entries considered equivalent, * if the difference between last use times is less then this number. */ #define RT_CACHE_BUBBLE_THRESHOLD (5*HZ) #define RTO_ONLINK 0x01 #define RTO_TPROXY 0x80000000 #ifdef CONFIG_IP_TRANSPARENT_PROXY #define RTO_CONN RTO_TPROXY #else #define RTO_CONN 0 #endif struct rt_key { __u32 dst; __u32 src; int iif; int oif; #ifdef CONFIG_IP_ROUTE_FWMARK __u32 fwmark; #endif __u8 tos; __u8 scope; }; struct rtable { union { struct dst_entry dst; struct rtable *rt_next; } u; unsigned rt_flags; unsigned rt_type; __u32 rt_dst; /* Path destination */ __u32 rt_src; /* Path source */ int rt_iif; /* Info on neighbour */ __u32 rt_gateway; /* Cache lookup keys */ struct rt_key key; /* Miscellaneous cached information */ __u32 rt_spec_dst; /* RFC1122 specific destination */ #ifdef CONFIG_IP_ROUTE_NAT __u32 rt_src_map; __u32 rt_dst_map; #endif }; extern struct rtable *rt_hash_table[RT_HASH_DIVISOR]; struct ip_rt_acct { __u32 o_bytes; __u32 o_packets; __u32 i_bytes; __u32 i_packets; }; extern struct ip_rt_acct ip_rt_acct[256]; extern void ip_rt_init(void); extern void ip_rt_redirect(u32 old_gw, u32 dst, u32 new_gw, u32 src, u8 tos, struct device *dev); extern void ip_rt_advice(struct rtable **rp, int advice); extern void rt_cache_flush(int how); extern int ip_route_output(struct rtable **, u32 dst, u32 src, u32 tos, int oif); extern int ip_route_input(struct sk_buff*, u32 dst, u32 src, u8 tos, struct device *devin); extern unsigned short ip_rt_frag_needed(struct iphdr *iph, unsigned short new_mtu); extern void ip_rt_update_pmtu(struct dst_entry *dst, unsigned mtu); extern void ip_rt_send_redirect(struct sk_buff *skb); extern unsigned inet_addr_type(u32 addr); extern void ip_rt_multicast_event(struct in_device *); extern int ip_rt_ioctl(unsigned int cmd, void *arg); extern void ip_rt_get_source(u8 *src, struct rtable *rt); extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb); extern __inline__ void ip_rt_put(struct rtable * rt) { if (rt) dst_release(&rt->u.dst); } extern __u8 ip_tos2prio[16]; extern __inline__ char rt_tos2priority(u8 tos) { return ip_tos2prio[IPTOS_TOS(tos)>>1]; } extern __inline__ int ip_route_connect(struct rtable **rp, u32 dst, u32 src, u32 tos, int oif) { int err; err = ip_route_output(rp, dst, src, tos, oif); if (err || (dst && src)) return err; dst = (*rp)->rt_dst; src = (*rp)->rt_src; ip_rt_put(*rp); *rp = NULL; return ip_route_output(rp, dst, src, tos, oif); } #endif /* _ROUTE_H */ |