| 1 | /* |
| 2 | * Linux INET6 implementation |
| 3 | * |
| 4 | * Authors: |
| 5 | * Pedro Roque <roque@di.fc.ul.pt> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #ifndef _IP6_FIB_H |
| 14 | #define _IP6_FIB_H |
| 15 | |
| 16 | #ifdef __KERNEL__ |
| 17 | |
| 18 | #include <linux/ipv6_route.h> |
| 19 | #include <linux/rtnetlink.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <net/dst.h> |
| 22 | #include <net/flow.h> |
| 23 | #include <net/netlink.h> |
| 24 | #include <net/inetpeer.h> |
| 25 | |
| 26 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 27 | #define FIB6_TABLE_HASHSZ 256 |
| 28 | #else |
| 29 | #define FIB6_TABLE_HASHSZ 1 |
| 30 | #endif |
| 31 | |
| 32 | struct rt6_info; |
| 33 | |
| 34 | struct fib6_config { |
| 35 | u32 fc_table; |
| 36 | u32 fc_metric; |
| 37 | int fc_dst_len; |
| 38 | int fc_src_len; |
| 39 | int fc_ifindex; |
| 40 | u32 fc_flags; |
| 41 | u32 fc_protocol; |
| 42 | |
| 43 | struct in6_addr fc_dst; |
| 44 | struct in6_addr fc_src; |
| 45 | struct in6_addr fc_gateway; |
| 46 | |
| 47 | unsigned long fc_expires; |
| 48 | struct nlattr *fc_mx; |
| 49 | int fc_mx_len; |
| 50 | |
| 51 | struct nl_info fc_nlinfo; |
| 52 | }; |
| 53 | |
| 54 | struct fib6_node { |
| 55 | struct fib6_node *parent; |
| 56 | struct fib6_node *left; |
| 57 | struct fib6_node *right; |
| 58 | #ifdef CONFIG_IPV6_SUBTREES |
| 59 | struct fib6_node *subtree; |
| 60 | #endif |
| 61 | struct rt6_info *leaf; |
| 62 | |
| 63 | __u16 fn_bit; /* bit key */ |
| 64 | __u16 fn_flags; |
| 65 | __u32 fn_sernum; |
| 66 | struct rt6_info *rr_ptr; |
| 67 | }; |
| 68 | |
| 69 | #ifndef CONFIG_IPV6_SUBTREES |
| 70 | #define FIB6_SUBTREE(fn) NULL |
| 71 | #else |
| 72 | #define FIB6_SUBTREE(fn) ((fn)->subtree) |
| 73 | #endif |
| 74 | |
| 75 | /* |
| 76 | * routing information |
| 77 | * |
| 78 | */ |
| 79 | |
| 80 | struct rt6key { |
| 81 | struct in6_addr addr; |
| 82 | int plen; |
| 83 | }; |
| 84 | |
| 85 | struct fib6_table; |
| 86 | |
| 87 | struct rt6_info { |
| 88 | struct dst_entry dst; |
| 89 | |
| 90 | #define rt6i_dev dst.dev |
| 91 | #define rt6i_nexthop dst.neighbour |
| 92 | #define rt6i_expires dst.expires |
| 93 | |
| 94 | /* |
| 95 | * Tail elements of dst_entry (__refcnt etc.) |
| 96 | * and these elements (rarely used in hot path) are in |
| 97 | * the same cache line. |
| 98 | */ |
| 99 | struct fib6_table *rt6i_table; |
| 100 | struct fib6_node *rt6i_node; |
| 101 | |
| 102 | struct in6_addr rt6i_gateway; |
| 103 | |
| 104 | atomic_t rt6i_ref; |
| 105 | |
| 106 | /* These are in a separate cache line. */ |
| 107 | struct rt6key rt6i_dst ____cacheline_aligned_in_smp; |
| 108 | u32 rt6i_flags; |
| 109 | struct rt6key rt6i_src; |
| 110 | u32 rt6i_metric; |
| 111 | u32 rt6i_peer_genid; |
| 112 | |
| 113 | struct inet6_dev *rt6i_idev; |
| 114 | struct inet_peer *rt6i_peer; |
| 115 | |
| 116 | #ifdef CONFIG_XFRM |
| 117 | u32 rt6i_flow_cache_genid; |
| 118 | #endif |
| 119 | /* more non-fragment space at head required */ |
| 120 | unsigned short rt6i_nfheader_len; |
| 121 | |
| 122 | u8 rt6i_protocol; |
| 123 | }; |
| 124 | |
| 125 | static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst) |
| 126 | { |
| 127 | return ((struct rt6_info *)dst)->rt6i_idev; |
| 128 | } |
| 129 | |
| 130 | struct fib6_walker_t { |
| 131 | struct list_head lh; |
| 132 | struct fib6_node *root, *node; |
| 133 | struct rt6_info *leaf; |
| 134 | unsigned char state; |
| 135 | unsigned char prune; |
| 136 | unsigned int skip; |
| 137 | unsigned int count; |
| 138 | int (*func)(struct fib6_walker_t *); |
| 139 | void *args; |
| 140 | }; |
| 141 | |
| 142 | struct rt6_statistics { |
| 143 | __u32 fib_nodes; |
| 144 | __u32 fib_route_nodes; |
| 145 | __u32 fib_rt_alloc; /* permanent routes */ |
| 146 | __u32 fib_rt_entries; /* rt entries in table */ |
| 147 | __u32 fib_rt_cache; /* cache routes */ |
| 148 | __u32 fib_discarded_routes; |
| 149 | }; |
| 150 | |
| 151 | #define RTN_TL_ROOT 0x0001 |
| 152 | #define RTN_ROOT 0x0002 /* tree root node */ |
| 153 | #define RTN_RTINFO 0x0004 /* node with valid routing info */ |
| 154 | |
| 155 | /* |
| 156 | * priority levels (or metrics) |
| 157 | * |
| 158 | */ |
| 159 | |
| 160 | |
| 161 | struct fib6_table { |
| 162 | struct hlist_node tb6_hlist; |
| 163 | u32 tb6_id; |
| 164 | rwlock_t tb6_lock; |
| 165 | struct fib6_node tb6_root; |
| 166 | }; |
| 167 | |
| 168 | #define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC |
| 169 | #define RT6_TABLE_MAIN RT_TABLE_MAIN |
| 170 | #define RT6_TABLE_DFLT RT6_TABLE_MAIN |
| 171 | #define RT6_TABLE_INFO RT6_TABLE_MAIN |
| 172 | #define RT6_TABLE_PREFIX RT6_TABLE_MAIN |
| 173 | |
| 174 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 175 | #define FIB6_TABLE_MIN 1 |
| 176 | #define FIB6_TABLE_MAX RT_TABLE_MAX |
| 177 | #define RT6_TABLE_LOCAL RT_TABLE_LOCAL |
| 178 | #else |
| 179 | #define FIB6_TABLE_MIN RT_TABLE_MAIN |
| 180 | #define FIB6_TABLE_MAX FIB6_TABLE_MIN |
| 181 | #define RT6_TABLE_LOCAL RT6_TABLE_MAIN |
| 182 | #endif |
| 183 | |
| 184 | typedef struct rt6_info *(*pol_lookup_t)(struct net *, |
| 185 | struct fib6_table *, |
| 186 | struct flowi6 *, int); |
| 187 | |
| 188 | /* |
| 189 | * exported functions |
| 190 | */ |
| 191 | |
| 192 | extern struct fib6_table *fib6_get_table(struct net *net, u32 id); |
| 193 | extern struct fib6_table *fib6_new_table(struct net *net, u32 id); |
| 194 | extern struct dst_entry *fib6_rule_lookup(struct net *net, |
| 195 | struct flowi6 *fl6, int flags, |
| 196 | pol_lookup_t lookup); |
| 197 | |
| 198 | extern struct fib6_node *fib6_lookup(struct fib6_node *root, |
| 199 | struct in6_addr *daddr, |
| 200 | struct in6_addr *saddr); |
| 201 | |
| 202 | struct fib6_node *fib6_locate(struct fib6_node *root, |
| 203 | struct in6_addr *daddr, int dst_len, |
| 204 | struct in6_addr *saddr, int src_len); |
| 205 | |
| 206 | extern void fib6_clean_all(struct net *net, |
| 207 | int (*func)(struct rt6_info *, void *arg), |
| 208 | int prune, void *arg); |
| 209 | |
| 210 | extern int fib6_add(struct fib6_node *root, |
| 211 | struct rt6_info *rt, |
| 212 | struct nl_info *info); |
| 213 | |
| 214 | extern int fib6_del(struct rt6_info *rt, |
| 215 | struct nl_info *info); |
| 216 | |
| 217 | extern void inet6_rt_notify(int event, struct rt6_info *rt, |
| 218 | struct nl_info *info); |
| 219 | |
| 220 | extern void fib6_run_gc(unsigned long expires, |
| 221 | struct net *net); |
| 222 | |
| 223 | extern void fib6_gc_cleanup(void); |
| 224 | |
| 225 | extern int fib6_init(void); |
| 226 | |
| 227 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 228 | extern int fib6_rules_init(void); |
| 229 | extern void fib6_rules_cleanup(void); |
| 230 | #else |
| 231 | static inline int fib6_rules_init(void) |
| 232 | { |
| 233 | return 0; |
| 234 | } |
| 235 | static inline void fib6_rules_cleanup(void) |
| 236 | { |
| 237 | return ; |
| 238 | } |
| 239 | #endif |
| 240 | #endif |
| 241 | #endif |