| 1 |
1275 |
phoenix |
/*
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| 2 |
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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| 3 |
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* operating system. DECnet is implemented using the BSD Socket
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| 4 |
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* interface as the means of communication with the user level.
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| 5 |
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*
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| 6 |
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* DECnet Routing Forwarding Information Base (Routing Tables)
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| 7 |
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*
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* Author: Steve Whitehouse <SteveW@ACM.org>
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* Mostly copied from the IPv4 routing code
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*
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*
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* Changes:
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*
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*/
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#include <linux/config.h>
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| 16 |
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#include <linux/string.h>
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| 17 |
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#include <linux/net.h>
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| 18 |
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#include <linux/socket.h>
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| 19 |
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#include <linux/sockios.h>
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| 20 |
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#include <linux/init.h>
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| 21 |
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#include <linux/skbuff.h>
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| 22 |
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#include <linux/netlink.h>
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| 23 |
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#include <linux/rtnetlink.h>
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| 24 |
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#include <linux/proc_fs.h>
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| 25 |
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#include <linux/netdevice.h>
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| 26 |
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#include <linux/timer.h>
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| 27 |
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#include <linux/spinlock.h>
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| 28 |
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#include <asm/atomic.h>
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| 29 |
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#include <asm/uaccess.h>
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| 30 |
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#include <linux/route.h> /* RTF_xxx */
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| 31 |
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#include <net/neighbour.h>
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| 32 |
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#include <net/dst.h>
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| 33 |
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#include <net/dn.h>
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| 34 |
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#include <net/dn_route.h>
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| 35 |
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#include <net/dn_fib.h>
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| 36 |
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#include <net/dn_neigh.h>
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| 37 |
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#include <net/dn_dev.h>
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| 38 |
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| 39 |
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struct dn_zone
|
| 40 |
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{
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| 41 |
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struct dn_zone *dz_next;
|
| 42 |
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struct dn_fib_node **dz_hash;
|
| 43 |
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int dz_nent;
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| 44 |
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int dz_divisor;
|
| 45 |
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u32 dz_hashmask;
|
| 46 |
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#define DZ_HASHMASK(dz) ((dz)->dz_hashmask)
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| 47 |
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int dz_order;
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| 48 |
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u32 dz_mask;
|
| 49 |
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#define DZ_MASK(dz) ((dz)->dz_mask)
|
| 50 |
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};
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| 51 |
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| 52 |
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struct dn_hash
|
| 53 |
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{
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| 54 |
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struct dn_zone *dh_zones[17];
|
| 55 |
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struct dn_zone *dh_zone_list;
|
| 56 |
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};
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| 57 |
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|
| 58 |
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#define dz_key_0(key) ((key).datum = 0)
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| 59 |
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#define dz_prefix(key,dz) ((key).datum)
|
| 60 |
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|
| 61 |
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#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
|
| 62 |
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for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
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| 63 |
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|
| 64 |
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#define endfor_nexthops(fi) }
|
| 65 |
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|
| 66 |
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#define DN_MAX_DIVISOR 1024
|
| 67 |
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#define DN_S_ZOMBIE 1
|
| 68 |
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#define DN_S_ACCESSED 2
|
| 69 |
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|
| 70 |
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#define DN_FIB_SCAN(f, fp) \
|
| 71 |
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for( ; ((f) = *(fp)) != NULL; (fp) = &(f)->fn_next)
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| 72 |
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|
| 73 |
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#define DN_FIB_SCAN_KEY(f, fp, key) \
|
| 74 |
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for( ; ((f) = *(fp)) != NULL && dn_key_eq((f)->fn_key, (key)); (fp) = &(f)->fn_next)
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| 75 |
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| 76 |
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|
| 77 |
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static rwlock_t dn_fib_tables_lock = RW_LOCK_UNLOCKED;
|
| 78 |
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static struct dn_fib_table *dn_fib_tables[DN_NUM_TABLES + 1];
|
| 79 |
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| 80 |
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static kmem_cache_t *dn_hash_kmem;
|
| 81 |
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static int dn_fib_hash_zombies;
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| 82 |
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|
| 83 |
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static __inline__ dn_fib_idx_t dn_hash(dn_fib_key_t key, struct dn_zone *dz)
|
| 84 |
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{
|
| 85 |
|
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u32 h = ntohs(key.datum)>>(16 - dz->dz_order);
|
| 86 |
|
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h ^= (h >> 10);
|
| 87 |
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h ^= (h >> 6);
|
| 88 |
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h ^= (h >> 3);
|
| 89 |
|
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h &= DZ_HASHMASK(dz);
|
| 90 |
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return *(dn_fib_idx_t *)&h;
|
| 91 |
|
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}
|
| 92 |
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|
| 93 |
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static __inline__ dn_fib_key_t dz_key(u16 dst, struct dn_zone *dz)
|
| 94 |
|
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{
|
| 95 |
|
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dn_fib_key_t k;
|
| 96 |
|
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k.datum = dst & DZ_MASK(dz);
|
| 97 |
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return k;
|
| 98 |
|
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}
|
| 99 |
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|
| 100 |
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static __inline__ struct dn_fib_node **dn_chain_p(dn_fib_key_t key, struct dn_zone *dz)
|
| 101 |
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{
|
| 102 |
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return &dz->dz_hash[dn_hash(key, dz).datum];
|
| 103 |
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}
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| 104 |
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| 105 |
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static __inline__ struct dn_fib_node *dz_chain(dn_fib_key_t key, struct dn_zone *dz)
|
| 106 |
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{
|
| 107 |
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return dz->dz_hash[dn_hash(key, dz).datum];
|
| 108 |
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}
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| 109 |
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| 110 |
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static __inline__ int dn_key_eq(dn_fib_key_t a, dn_fib_key_t b)
|
| 111 |
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{
|
| 112 |
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return a.datum == b.datum;
|
| 113 |
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}
|
| 114 |
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|
| 115 |
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static __inline__ int dn_key_leq(dn_fib_key_t a, dn_fib_key_t b)
|
| 116 |
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{
|
| 117 |
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return a.datum <= b.datum;
|
| 118 |
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}
|
| 119 |
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|
| 120 |
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static __inline__ void dn_rebuild_zone(struct dn_zone *dz,
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| 121 |
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struct dn_fib_node **old_ht,
|
| 122 |
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int old_divisor)
|
| 123 |
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{
|
| 124 |
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int i;
|
| 125 |
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struct dn_fib_node *f, **fp, *next;
|
| 126 |
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|
|
| 127 |
|
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for(i = 0; i < old_divisor; i++) {
|
| 128 |
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for(f = old_ht[i]; f; f = f->fn_next) {
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| 129 |
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next = f->fn_next;
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| 130 |
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for(fp = dn_chain_p(f->fn_key, dz);
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| 131 |
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*fp && dn_key_leq((*fp)->fn_key, f->fn_key);
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| 132 |
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fp = &(*fp)->fn_next)
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| 133 |
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/* NOTHING */;
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| 134 |
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f->fn_next = *fp;
|
| 135 |
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*fp = f;
|
| 136 |
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}
|
| 137 |
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}
|
| 138 |
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}
|
| 139 |
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|
| 140 |
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static void dn_rehash_zone(struct dn_zone *dz)
|
| 141 |
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{
|
| 142 |
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struct dn_fib_node **ht, **old_ht;
|
| 143 |
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int old_divisor, new_divisor;
|
| 144 |
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u32 new_hashmask;
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| 145 |
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| 146 |
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old_divisor = dz->dz_divisor;
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| 147 |
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| 148 |
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switch(old_divisor) {
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| 149 |
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case 16:
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| 150 |
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new_divisor = 256;
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| 151 |
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new_hashmask = 0xFF;
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| 152 |
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break;
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| 153 |
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default:
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| 154 |
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printk(KERN_DEBUG "DECnet: dn_rehash_zone: BUG! %d\n", old_divisor);
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| 155 |
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case 256:
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| 156 |
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new_divisor = 1024;
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| 157 |
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new_hashmask = 0x3FF;
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| 158 |
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break;
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| 159 |
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}
|
| 160 |
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| 161 |
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ht = kmalloc(new_divisor*sizeof(struct dn_fib_node*), GFP_KERNEL);
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| 162 |
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| 163 |
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if (ht == NULL)
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| 164 |
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return;
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| 165 |
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| 166 |
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memset(ht, 0, new_divisor*sizeof(struct dn_fib_node *));
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| 167 |
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write_lock_bh(&dn_fib_tables_lock);
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| 168 |
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old_ht = dz->dz_hash;
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| 169 |
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dz->dz_hash = ht;
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| 170 |
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dz->dz_hashmask = new_hashmask;
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| 171 |
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dz->dz_divisor = new_divisor;
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| 172 |
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dn_rebuild_zone(dz, old_ht, old_divisor);
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| 173 |
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write_unlock_bh(&dn_fib_tables_lock);
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| 174 |
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kfree(old_ht);
|
| 175 |
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}
|
| 176 |
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|
| 177 |
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static void dn_free_node(struct dn_fib_node *f)
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| 178 |
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{
|
| 179 |
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dn_fib_release_info(DN_FIB_INFO(f));
|
| 180 |
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kmem_cache_free(dn_hash_kmem, f);
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| 181 |
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}
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| 182 |
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|
| 183 |
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| 184 |
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static struct dn_zone *dn_new_zone(struct dn_hash *table, int z)
|
| 185 |
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{
|
| 186 |
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int i;
|
| 187 |
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struct dn_zone *dz = kmalloc(sizeof(struct dn_zone), GFP_KERNEL);
|
| 188 |
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if (!dz)
|
| 189 |
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return NULL;
|
| 190 |
|
|
|
| 191 |
|
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memset(dz, 0, sizeof(struct dn_zone));
|
| 192 |
|
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if (z) {
|
| 193 |
|
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dz->dz_divisor = 16;
|
| 194 |
|
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dz->dz_hashmask = 0x0F;
|
| 195 |
|
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} else {
|
| 196 |
|
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dz->dz_divisor = 1;
|
| 197 |
|
|
dz->dz_hashmask = 0;
|
| 198 |
|
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}
|
| 199 |
|
|
|
| 200 |
|
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dz->dz_hash = kmalloc(dz->dz_divisor*sizeof(struct dn_fib_node *), GFP_KERNEL);
|
| 201 |
|
|
|
| 202 |
|
|
if (!dz->dz_hash) {
|
| 203 |
|
|
kfree(dz);
|
| 204 |
|
|
return NULL;
|
| 205 |
|
|
}
|
| 206 |
|
|
|
| 207 |
|
|
memset(dz->dz_hash, 0, dz->dz_divisor*sizeof(struct dn_fib_node*));
|
| 208 |
|
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dz->dz_order = z;
|
| 209 |
|
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dz->dz_mask = dnet_make_mask(z);
|
| 210 |
|
|
|
| 211 |
|
|
for(i = z + 1; i <= 16; i++)
|
| 212 |
|
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if (table->dh_zones[i])
|
| 213 |
|
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break;
|
| 214 |
|
|
|
| 215 |
|
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write_lock_bh(&dn_fib_tables_lock);
|
| 216 |
|
|
if (i>16) {
|
| 217 |
|
|
dz->dz_next = table->dh_zone_list;
|
| 218 |
|
|
table->dh_zone_list = dz;
|
| 219 |
|
|
} else {
|
| 220 |
|
|
dz->dz_next = table->dh_zones[i]->dz_next;
|
| 221 |
|
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table->dh_zones[i]->dz_next = dz;
|
| 222 |
|
|
}
|
| 223 |
|
|
table->dh_zones[z] = dz;
|
| 224 |
|
|
write_unlock_bh(&dn_fib_tables_lock);
|
| 225 |
|
|
return dz;
|
| 226 |
|
|
}
|
| 227 |
|
|
|
| 228 |
|
|
|
| 229 |
|
|
static int dn_fib_nh_match(struct rtmsg *r, struct nlmsghdr *nlh, struct dn_kern_rta *rta, struct dn_fib_info *fi)
|
| 230 |
|
|
{
|
| 231 |
|
|
struct rtnexthop *nhp;
|
| 232 |
|
|
int nhlen;
|
| 233 |
|
|
|
| 234 |
|
|
if (rta->rta_priority && *rta->rta_priority != fi->fib_priority)
|
| 235 |
|
|
return 1;
|
| 236 |
|
|
|
| 237 |
|
|
if (rta->rta_oif || rta->rta_gw) {
|
| 238 |
|
|
if ((!rta->rta_oif || *rta->rta_oif == fi->fib_nh->nh_oif) &&
|
| 239 |
|
|
(!rta->rta_gw || memcmp(rta->rta_gw, &fi->fib_nh->nh_gw, 2) == 0))
|
| 240 |
|
|
return 0;
|
| 241 |
|
|
return 1;
|
| 242 |
|
|
}
|
| 243 |
|
|
|
| 244 |
|
|
if (rta->rta_mp == NULL)
|
| 245 |
|
|
return 0;
|
| 246 |
|
|
|
| 247 |
|
|
nhp = RTA_DATA(rta->rta_mp);
|
| 248 |
|
|
nhlen = RTA_PAYLOAD(rta->rta_mp);
|
| 249 |
|
|
|
| 250 |
|
|
for_nexthops(fi) {
|
| 251 |
|
|
int attrlen = nhlen - sizeof(struct rtnexthop);
|
| 252 |
|
|
dn_address gw;
|
| 253 |
|
|
|
| 254 |
|
|
if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
|
| 255 |
|
|
return -EINVAL;
|
| 256 |
|
|
if (nhp->rtnh_ifindex && nhp->rtnh_ifindex != nh->nh_oif)
|
| 257 |
|
|
return 1;
|
| 258 |
|
|
if (attrlen) {
|
| 259 |
|
|
gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
|
| 260 |
|
|
|
| 261 |
|
|
if (gw && gw != nh->nh_gw)
|
| 262 |
|
|
return 1;
|
| 263 |
|
|
}
|
| 264 |
|
|
nhp = RTNH_NEXT(nhp);
|
| 265 |
|
|
} endfor_nexthops(fi);
|
| 266 |
|
|
|
| 267 |
|
|
return 0;
|
| 268 |
|
|
}
|
| 269 |
|
|
|
| 270 |
|
|
static int dn_fib_dump_info(struct sk_buff *skb, u32 pid, u32 seq, int event,
|
| 271 |
|
|
u8 tb_id, u8 type, u8 scope, void *dst, int dst_len,
|
| 272 |
|
|
struct dn_fib_info *fi)
|
| 273 |
|
|
{
|
| 274 |
|
|
struct rtmsg *rtm;
|
| 275 |
|
|
struct nlmsghdr *nlh;
|
| 276 |
|
|
unsigned char *b = skb->tail;
|
| 277 |
|
|
|
| 278 |
|
|
nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*rtm));
|
| 279 |
|
|
rtm = NLMSG_DATA(nlh);
|
| 280 |
|
|
rtm->rtm_family = AF_DECnet;
|
| 281 |
|
|
rtm->rtm_dst_len = dst_len;
|
| 282 |
|
|
rtm->rtm_src_len = 0;
|
| 283 |
|
|
rtm->rtm_tos = 0;
|
| 284 |
|
|
rtm->rtm_table = tb_id;
|
| 285 |
|
|
rtm->rtm_flags = fi->fib_flags;
|
| 286 |
|
|
rtm->rtm_scope = scope;
|
| 287 |
|
|
rtm->rtm_type = type;
|
| 288 |
|
|
if (rtm->rtm_dst_len)
|
| 289 |
|
|
RTA_PUT(skb, RTA_DST, 2, dst);
|
| 290 |
|
|
rtm->rtm_protocol = fi->fib_protocol;
|
| 291 |
|
|
if (fi->fib_priority)
|
| 292 |
|
|
RTA_PUT(skb, RTA_PRIORITY, 4, &fi->fib_priority);
|
| 293 |
|
|
if (fi->fib_nhs == 1) {
|
| 294 |
|
|
if (fi->fib_nh->nh_gw)
|
| 295 |
|
|
RTA_PUT(skb, RTA_GATEWAY, 2, &fi->fib_nh->nh_gw);
|
| 296 |
|
|
if (fi->fib_nh->nh_oif)
|
| 297 |
|
|
RTA_PUT(skb, RTA_OIF, sizeof(int), &fi->fib_nh->nh_oif);
|
| 298 |
|
|
}
|
| 299 |
|
|
if (fi->fib_nhs > 1) {
|
| 300 |
|
|
struct rtnexthop *nhp;
|
| 301 |
|
|
struct rtattr *mp_head;
|
| 302 |
|
|
if (skb_tailroom(skb) <= RTA_SPACE(0))
|
| 303 |
|
|
goto rtattr_failure;
|
| 304 |
|
|
mp_head = (struct rtattr *)skb_put(skb, RTA_SPACE(0));
|
| 305 |
|
|
|
| 306 |
|
|
for_nexthops(fi) {
|
| 307 |
|
|
if (skb_tailroom(skb) < RTA_ALIGN(RTA_ALIGN(sizeof(*nhp)) + 4))
|
| 308 |
|
|
goto rtattr_failure;
|
| 309 |
|
|
nhp = (struct rtnexthop *)skb_put(skb, RTA_ALIGN(sizeof(*nhp)));
|
| 310 |
|
|
nhp->rtnh_flags = nh->nh_flags & 0xFF;
|
| 311 |
|
|
nhp->rtnh_hops = nh->nh_weight - 1;
|
| 312 |
|
|
nhp->rtnh_ifindex = nh->nh_oif;
|
| 313 |
|
|
if (nh->nh_gw)
|
| 314 |
|
|
RTA_PUT(skb, RTA_GATEWAY, 2, &nh->nh_gw);
|
| 315 |
|
|
nhp->rtnh_len = skb->tail - (unsigned char *)nhp;
|
| 316 |
|
|
} endfor_nexthops(fi);
|
| 317 |
|
|
mp_head->rta_type = RTA_MULTIPATH;
|
| 318 |
|
|
mp_head->rta_len = skb->tail - (u8*)mp_head;
|
| 319 |
|
|
}
|
| 320 |
|
|
|
| 321 |
|
|
nlh->nlmsg_len = skb->tail - b;
|
| 322 |
|
|
return skb->len;
|
| 323 |
|
|
|
| 324 |
|
|
|
| 325 |
|
|
nlmsg_failure:
|
| 326 |
|
|
rtattr_failure:
|
| 327 |
|
|
skb_trim(skb, b - skb->data);
|
| 328 |
|
|
return -1;
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
|
| 332 |
|
|
static void dn_rtmsg_fib(int event, struct dn_fib_node *f, int z, int tb_id,
|
| 333 |
|
|
struct nlmsghdr *nlh, struct netlink_skb_parms *req)
|
| 334 |
|
|
{
|
| 335 |
|
|
struct sk_buff *skb;
|
| 336 |
|
|
u32 pid = req ? req->pid : 0;
|
| 337 |
|
|
int size = NLMSG_SPACE(sizeof(struct rtmsg) + 256);
|
| 338 |
|
|
|
| 339 |
|
|
skb = alloc_skb(size, GFP_KERNEL);
|
| 340 |
|
|
if (!skb)
|
| 341 |
|
|
return;
|
| 342 |
|
|
|
| 343 |
|
|
if (dn_fib_dump_info(skb, pid, nlh->nlmsg_seq, event, tb_id,
|
| 344 |
|
|
f->fn_type, f->fn_scope, &f->fn_key, z,
|
| 345 |
|
|
DN_FIB_INFO(f)) < 0) {
|
| 346 |
|
|
kfree_skb(skb);
|
| 347 |
|
|
return;
|
| 348 |
|
|
}
|
| 349 |
|
|
NETLINK_CB(skb).dst_groups = RTMGRP_DECnet_ROUTE;
|
| 350 |
|
|
if (nlh->nlmsg_flags & NLM_F_ECHO)
|
| 351 |
|
|
atomic_inc(&skb->users);
|
| 352 |
|
|
netlink_broadcast(rtnl, skb, pid, RTMGRP_DECnet_ROUTE, GFP_KERNEL);
|
| 353 |
|
|
if (nlh->nlmsg_flags & NLM_F_ECHO)
|
| 354 |
|
|
netlink_unicast(rtnl, skb, pid, MSG_DONTWAIT);
|
| 355 |
|
|
}
|
| 356 |
|
|
|
| 357 |
|
|
static __inline__ int dn_hash_dump_bucket(struct sk_buff *skb,
|
| 358 |
|
|
struct netlink_callback *cb,
|
| 359 |
|
|
struct dn_fib_table *tb,
|
| 360 |
|
|
struct dn_zone *dz,
|
| 361 |
|
|
struct dn_fib_node *f)
|
| 362 |
|
|
{
|
| 363 |
|
|
int i, s_i;
|
| 364 |
|
|
|
| 365 |
|
|
s_i = cb->args[3];
|
| 366 |
|
|
for(i = 0; f; i++, f = f->fn_next) {
|
| 367 |
|
|
if (i < s_i)
|
| 368 |
|
|
continue;
|
| 369 |
|
|
if (f->fn_state & DN_S_ZOMBIE)
|
| 370 |
|
|
continue;
|
| 371 |
|
|
if (dn_fib_dump_info(skb, NETLINK_CB(cb->skb).pid,
|
| 372 |
|
|
cb->nlh->nlmsg_seq,
|
| 373 |
|
|
RTM_NEWROUTE,
|
| 374 |
|
|
tb->n,
|
| 375 |
|
|
(f->fn_state & DN_S_ZOMBIE) ? 0 : f->fn_type,
|
| 376 |
|
|
f->fn_scope, &f->fn_key, dz->dz_order,
|
| 377 |
|
|
f->fn_info) < 0) {
|
| 378 |
|
|
cb->args[3] = i;
|
| 379 |
|
|
return -1;
|
| 380 |
|
|
}
|
| 381 |
|
|
}
|
| 382 |
|
|
cb->args[3] = i;
|
| 383 |
|
|
return skb->len;
|
| 384 |
|
|
}
|
| 385 |
|
|
|
| 386 |
|
|
static __inline__ int dn_hash_dump_zone(struct sk_buff *skb,
|
| 387 |
|
|
struct netlink_callback *cb,
|
| 388 |
|
|
struct dn_fib_table *tb,
|
| 389 |
|
|
struct dn_zone *dz)
|
| 390 |
|
|
{
|
| 391 |
|
|
int h, s_h;
|
| 392 |
|
|
|
| 393 |
|
|
s_h = cb->args[2];
|
| 394 |
|
|
for(h = 0; h < dz->dz_divisor; h++) {
|
| 395 |
|
|
if (h < s_h)
|
| 396 |
|
|
continue;
|
| 397 |
|
|
if (h > s_h)
|
| 398 |
|
|
memset(&cb->args[3], 0, sizeof(cb->args) - 3*sizeof(cb->args[0]));
|
| 399 |
|
|
if (dz->dz_hash == NULL || dz->dz_hash[h] == NULL)
|
| 400 |
|
|
continue;
|
| 401 |
|
|
if (dn_hash_dump_bucket(skb, cb, tb, dz, dz->dz_hash[h]) < 0) {
|
| 402 |
|
|
cb->args[2] = h;
|
| 403 |
|
|
return -1;
|
| 404 |
|
|
}
|
| 405 |
|
|
}
|
| 406 |
|
|
cb->args[2] = h;
|
| 407 |
|
|
return skb->len;
|
| 408 |
|
|
}
|
| 409 |
|
|
|
| 410 |
|
|
static int dn_fib_table_dump(struct dn_fib_table *tb, struct sk_buff *skb,
|
| 411 |
|
|
struct netlink_callback *cb)
|
| 412 |
|
|
{
|
| 413 |
|
|
int m, s_m;
|
| 414 |
|
|
struct dn_zone *dz;
|
| 415 |
|
|
struct dn_hash *table = (struct dn_hash *)tb->data;
|
| 416 |
|
|
|
| 417 |
|
|
s_m = cb->args[1];
|
| 418 |
|
|
read_lock(&dn_fib_tables_lock);
|
| 419 |
|
|
for(dz = table->dh_zone_list, m = 0; dz; dz = dz->dz_next, m++) {
|
| 420 |
|
|
if (m < s_m)
|
| 421 |
|
|
continue;
|
| 422 |
|
|
if (m > s_m)
|
| 423 |
|
|
memset(&cb->args[2], 0, sizeof(cb->args) - 2*sizeof(cb->args[0]));
|
| 424 |
|
|
|
| 425 |
|
|
if (dn_hash_dump_zone(skb, cb, tb, dz) < 0) {
|
| 426 |
|
|
cb->args[1] = m;
|
| 427 |
|
|
read_unlock(&dn_fib_tables_lock);
|
| 428 |
|
|
return -1;
|
| 429 |
|
|
}
|
| 430 |
|
|
}
|
| 431 |
|
|
read_unlock(&dn_fib_tables_lock);
|
| 432 |
|
|
cb->args[1] = m;
|
| 433 |
|
|
|
| 434 |
|
|
return skb->len;
|
| 435 |
|
|
}
|
| 436 |
|
|
|
| 437 |
|
|
static int dn_fib_table_insert(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
|
| 438 |
|
|
{
|
| 439 |
|
|
struct dn_hash *table = (struct dn_hash *)tb->data;
|
| 440 |
|
|
struct dn_fib_node *new_f, *f, **fp, **del_fp;
|
| 441 |
|
|
struct dn_zone *dz;
|
| 442 |
|
|
struct dn_fib_info *fi;
|
| 443 |
|
|
int z = r->rtm_dst_len;
|
| 444 |
|
|
int type = r->rtm_type;
|
| 445 |
|
|
dn_fib_key_t key;
|
| 446 |
|
|
int err;
|
| 447 |
|
|
|
| 448 |
|
|
if (z > 16)
|
| 449 |
|
|
return -EINVAL;
|
| 450 |
|
|
|
| 451 |
|
|
dz = table->dh_zones[z];
|
| 452 |
|
|
if (!dz && !(dz = dn_new_zone(table, z)))
|
| 453 |
|
|
return -ENOBUFS;
|
| 454 |
|
|
|
| 455 |
|
|
dz_key_0(key);
|
| 456 |
|
|
if (rta->rta_dst) {
|
| 457 |
|
|
dn_address dst;
|
| 458 |
|
|
memcpy(&dst, rta->rta_dst, 2);
|
| 459 |
|
|
if (dst & ~DZ_MASK(dz))
|
| 460 |
|
|
return -EINVAL;
|
| 461 |
|
|
key = dz_key(dst, dz);
|
| 462 |
|
|
}
|
| 463 |
|
|
|
| 464 |
|
|
if ((fi = dn_fib_create_info(r, rta, n, &err)) == NULL)
|
| 465 |
|
|
return err;
|
| 466 |
|
|
|
| 467 |
|
|
if (dz->dz_nent > (dz->dz_divisor << 2) &&
|
| 468 |
|
|
dz->dz_divisor > DN_MAX_DIVISOR &&
|
| 469 |
|
|
(z==16 || (1<<z) > dz->dz_divisor))
|
| 470 |
|
|
dn_rehash_zone(dz);
|
| 471 |
|
|
|
| 472 |
|
|
fp = dn_chain_p(key, dz);
|
| 473 |
|
|
|
| 474 |
|
|
DN_FIB_SCAN(f, fp) {
|
| 475 |
|
|
if (dn_key_leq(key, f->fn_key))
|
| 476 |
|
|
break;
|
| 477 |
|
|
}
|
| 478 |
|
|
|
| 479 |
|
|
del_fp = NULL;
|
| 480 |
|
|
|
| 481 |
|
|
if (f && (f->fn_state & DN_S_ZOMBIE) &&
|
| 482 |
|
|
dn_key_eq(f->fn_key, key)) {
|
| 483 |
|
|
del_fp = fp;
|
| 484 |
|
|
fp = &f->fn_next;
|
| 485 |
|
|
f = *fp;
|
| 486 |
|
|
goto create;
|
| 487 |
|
|
}
|
| 488 |
|
|
|
| 489 |
|
|
DN_FIB_SCAN_KEY(f, fp, key) {
|
| 490 |
|
|
if (fi->fib_priority <= DN_FIB_INFO(f)->fib_priority)
|
| 491 |
|
|
break;
|
| 492 |
|
|
}
|
| 493 |
|
|
|
| 494 |
|
|
if (f && dn_key_eq(f->fn_key, key) &&
|
| 495 |
|
|
fi->fib_priority == DN_FIB_INFO(f)->fib_priority) {
|
| 496 |
|
|
struct dn_fib_node **ins_fp;
|
| 497 |
|
|
|
| 498 |
|
|
err = -EEXIST;
|
| 499 |
|
|
if (n->nlmsg_flags & NLM_F_EXCL)
|
| 500 |
|
|
goto out;
|
| 501 |
|
|
|
| 502 |
|
|
if (n->nlmsg_flags & NLM_F_REPLACE) {
|
| 503 |
|
|
del_fp = fp;
|
| 504 |
|
|
fp = &f->fn_next;
|
| 505 |
|
|
f = *fp;
|
| 506 |
|
|
goto replace;
|
| 507 |
|
|
}
|
| 508 |
|
|
|
| 509 |
|
|
ins_fp = fp;
|
| 510 |
|
|
err = -EEXIST;
|
| 511 |
|
|
|
| 512 |
|
|
DN_FIB_SCAN_KEY(f, fp, key) {
|
| 513 |
|
|
if (fi->fib_priority != DN_FIB_INFO(f)->fib_priority)
|
| 514 |
|
|
break;
|
| 515 |
|
|
if (f->fn_type == type && f->fn_scope == r->rtm_scope
|
| 516 |
|
|
&& DN_FIB_INFO(f) == fi)
|
| 517 |
|
|
goto out;
|
| 518 |
|
|
}
|
| 519 |
|
|
|
| 520 |
|
|
if (!(n->nlmsg_flags & NLM_F_APPEND)) {
|
| 521 |
|
|
fp = ins_fp;
|
| 522 |
|
|
f = *fp;
|
| 523 |
|
|
}
|
| 524 |
|
|
}
|
| 525 |
|
|
|
| 526 |
|
|
create:
|
| 527 |
|
|
err = -ENOENT;
|
| 528 |
|
|
if (!(n->nlmsg_flags & NLM_F_CREATE))
|
| 529 |
|
|
goto out;
|
| 530 |
|
|
|
| 531 |
|
|
replace:
|
| 532 |
|
|
err = -ENOBUFS;
|
| 533 |
|
|
new_f = kmem_cache_alloc(dn_hash_kmem, SLAB_KERNEL);
|
| 534 |
|
|
if (new_f == NULL)
|
| 535 |
|
|
goto out;
|
| 536 |
|
|
|
| 537 |
|
|
memset(new_f, 0, sizeof(struct dn_fib_node));
|
| 538 |
|
|
|
| 539 |
|
|
new_f->fn_key = key;
|
| 540 |
|
|
new_f->fn_type = type;
|
| 541 |
|
|
new_f->fn_scope = r->rtm_scope;
|
| 542 |
|
|
DN_FIB_INFO(new_f) = fi;
|
| 543 |
|
|
|
| 544 |
|
|
new_f->fn_next = f;
|
| 545 |
|
|
write_lock_bh(&dn_fib_tables_lock);
|
| 546 |
|
|
*fp = new_f;
|
| 547 |
|
|
write_unlock_bh(&dn_fib_tables_lock);
|
| 548 |
|
|
dz->dz_nent++;
|
| 549 |
|
|
|
| 550 |
|
|
if (del_fp) {
|
| 551 |
|
|
f = *del_fp;
|
| 552 |
|
|
write_lock_bh(&dn_fib_tables_lock);
|
| 553 |
|
|
*del_fp = f->fn_next;
|
| 554 |
|
|
write_unlock_bh(&dn_fib_tables_lock);
|
| 555 |
|
|
|
| 556 |
|
|
if (!(f->fn_state & DN_S_ZOMBIE))
|
| 557 |
|
|
dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
|
| 558 |
|
|
if (f->fn_state & DN_S_ACCESSED)
|
| 559 |
|
|
dn_rt_cache_flush(-1);
|
| 560 |
|
|
dn_free_node(f);
|
| 561 |
|
|
dz->dz_nent--;
|
| 562 |
|
|
} else {
|
| 563 |
|
|
dn_rt_cache_flush(-1);
|
| 564 |
|
|
}
|
| 565 |
|
|
|
| 566 |
|
|
dn_rtmsg_fib(RTM_NEWROUTE, new_f, z, tb->n, n, req);
|
| 567 |
|
|
|
| 568 |
|
|
return 0;
|
| 569 |
|
|
out:
|
| 570 |
|
|
dn_fib_release_info(fi);
|
| 571 |
|
|
return err;
|
| 572 |
|
|
}
|
| 573 |
|
|
|
| 574 |
|
|
|
| 575 |
|
|
static int dn_fib_table_delete(struct dn_fib_table *tb, struct rtmsg *r, struct dn_kern_rta *rta, struct nlmsghdr *n, struct netlink_skb_parms *req)
|
| 576 |
|
|
{
|
| 577 |
|
|
struct dn_hash *table = (struct dn_hash*)tb->data;
|
| 578 |
|
|
struct dn_fib_node **fp, **del_fp, *f;
|
| 579 |
|
|
int z = r->rtm_dst_len;
|
| 580 |
|
|
struct dn_zone *dz;
|
| 581 |
|
|
dn_fib_key_t key;
|
| 582 |
|
|
int matched;
|
| 583 |
|
|
|
| 584 |
|
|
|
| 585 |
|
|
if (z > 16)
|
| 586 |
|
|
return -EINVAL;
|
| 587 |
|
|
|
| 588 |
|
|
if ((dz = table->dh_zones[z]) == NULL)
|
| 589 |
|
|
return -ESRCH;
|
| 590 |
|
|
|
| 591 |
|
|
dz_key_0(key);
|
| 592 |
|
|
if (rta->rta_dst) {
|
| 593 |
|
|
dn_address dst;
|
| 594 |
|
|
memcpy(&dst, rta->rta_dst, 2);
|
| 595 |
|
|
if (dst & ~DZ_MASK(dz))
|
| 596 |
|
|
return -EINVAL;
|
| 597 |
|
|
key = dz_key(dst, dz);
|
| 598 |
|
|
}
|
| 599 |
|
|
|
| 600 |
|
|
fp = dn_chain_p(key, dz);
|
| 601 |
|
|
|
| 602 |
|
|
DN_FIB_SCAN(f, fp) {
|
| 603 |
|
|
if (dn_key_eq(f->fn_key, key))
|
| 604 |
|
|
break;
|
| 605 |
|
|
if (dn_key_leq(key, f->fn_key))
|
| 606 |
|
|
return -ESRCH;
|
| 607 |
|
|
}
|
| 608 |
|
|
|
| 609 |
|
|
matched = 0;
|
| 610 |
|
|
del_fp = NULL;
|
| 611 |
|
|
DN_FIB_SCAN_KEY(f, fp, key) {
|
| 612 |
|
|
struct dn_fib_info *fi = DN_FIB_INFO(f);
|
| 613 |
|
|
|
| 614 |
|
|
if (f->fn_state & DN_S_ZOMBIE)
|
| 615 |
|
|
return -ESRCH;
|
| 616 |
|
|
|
| 617 |
|
|
matched++;
|
| 618 |
|
|
|
| 619 |
|
|
if (del_fp == NULL &&
|
| 620 |
|
|
(!r->rtm_type || f->fn_type == r->rtm_type) &&
|
| 621 |
|
|
(r->rtm_scope == RT_SCOPE_NOWHERE || f->fn_scope == r->rtm_scope) &&
|
| 622 |
|
|
(!r->rtm_protocol ||
|
| 623 |
|
|
fi->fib_protocol == r->rtm_protocol) &&
|
| 624 |
|
|
dn_fib_nh_match(r, n, rta, fi) == 0)
|
| 625 |
|
|
del_fp = fp;
|
| 626 |
|
|
}
|
| 627 |
|
|
|
| 628 |
|
|
if (del_fp) {
|
| 629 |
|
|
f = *del_fp;
|
| 630 |
|
|
dn_rtmsg_fib(RTM_DELROUTE, f, z, tb->n, n, req);
|
| 631 |
|
|
|
| 632 |
|
|
if (matched != 1) {
|
| 633 |
|
|
write_lock_bh(&dn_fib_tables_lock);
|
| 634 |
|
|
*del_fp = f->fn_next;
|
| 635 |
|
|
write_unlock_bh(&dn_fib_tables_lock);
|
| 636 |
|
|
|
| 637 |
|
|
if (f->fn_state & DN_S_ACCESSED)
|
| 638 |
|
|
dn_rt_cache_flush(-1);
|
| 639 |
|
|
dn_free_node(f);
|
| 640 |
|
|
dz->dz_nent--;
|
| 641 |
|
|
} else {
|
| 642 |
|
|
f->fn_state |= DN_S_ZOMBIE;
|
| 643 |
|
|
if (f->fn_state & DN_S_ACCESSED) {
|
| 644 |
|
|
f->fn_state &= ~DN_S_ACCESSED;
|
| 645 |
|
|
dn_rt_cache_flush(-1);
|
| 646 |
|
|
}
|
| 647 |
|
|
if (++dn_fib_hash_zombies > 128)
|
| 648 |
|
|
dn_fib_flush();
|
| 649 |
|
|
}
|
| 650 |
|
|
|
| 651 |
|
|
return 0;
|
| 652 |
|
|
}
|
| 653 |
|
|
|
| 654 |
|
|
return -ESRCH;
|
| 655 |
|
|
}
|
| 656 |
|
|
|
| 657 |
|
|
static __inline__ int dn_flush_list(struct dn_fib_node **fp, int z, struct dn_hash *table)
|
| 658 |
|
|
{
|
| 659 |
|
|
int found = 0;
|
| 660 |
|
|
struct dn_fib_node *f;
|
| 661 |
|
|
|
| 662 |
|
|
while((f = *fp) != NULL) {
|
| 663 |
|
|
struct dn_fib_info *fi = DN_FIB_INFO(f);
|
| 664 |
|
|
|
| 665 |
|
|
if (fi && ((f->fn_state & DN_S_ZOMBIE) || (fi->fib_flags & RTNH_F_DEAD))) {
|
| 666 |
|
|
write_lock_bh(&dn_fib_tables_lock);
|
| 667 |
|
|
*fp = f->fn_next;
|
| 668 |
|
|
write_unlock_bh(&dn_fib_tables_lock);
|
| 669 |
|
|
|
| 670 |
|
|
dn_free_node(f);
|
| 671 |
|
|
found++;
|
| 672 |
|
|
continue;
|
| 673 |
|
|
}
|
| 674 |
|
|
fp = &f->fn_next;
|
| 675 |
|
|
}
|
| 676 |
|
|
|
| 677 |
|
|
return found;
|
| 678 |
|
|
}
|
| 679 |
|
|
|
| 680 |
|
|
static int dn_fib_table_flush(struct dn_fib_table *tb)
|
| 681 |
|
|
{
|
| 682 |
|
|
struct dn_hash *table = (struct dn_hash *)tb->data;
|
| 683 |
|
|
struct dn_zone *dz;
|
| 684 |
|
|
int found = 0;
|
| 685 |
|
|
|
| 686 |
|
|
dn_fib_hash_zombies = 0;
|
| 687 |
|
|
for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
|
| 688 |
|
|
int i;
|
| 689 |
|
|
int tmp = 0;
|
| 690 |
|
|
for(i = dz->dz_divisor-1; i >= 0; i--)
|
| 691 |
|
|
tmp += dn_flush_list(&dz->dz_hash[i], dz->dz_order, table);
|
| 692 |
|
|
dz->dz_nent -= tmp;
|
| 693 |
|
|
found += tmp;
|
| 694 |
|
|
}
|
| 695 |
|
|
|
| 696 |
|
|
return found;
|
| 697 |
|
|
}
|
| 698 |
|
|
|
| 699 |
|
|
static int dn_fib_table_lookup(struct dn_fib_table *tb, const struct dn_fib_key *
|
| 700 |
|
|
key, struct dn_fib_res *res)
|
| 701 |
|
|
{
|
| 702 |
|
|
int err;
|
| 703 |
|
|
struct dn_zone *dz;
|
| 704 |
|
|
struct dn_hash *t = (struct dn_hash *)tb->data;
|
| 705 |
|
|
|
| 706 |
|
|
read_lock(&dn_fib_tables_lock);
|
| 707 |
|
|
for(dz = t->dh_zone_list; dz; dz = dz->dz_next) {
|
| 708 |
|
|
struct dn_fib_node *f;
|
| 709 |
|
|
dn_fib_key_t k = dz_key(key->dst, dz);
|
| 710 |
|
|
|
| 711 |
|
|
for(f = dz_chain(k, dz); f; f = f->fn_next) {
|
| 712 |
|
|
if (!dn_key_leq(k, f->fn_key))
|
| 713 |
|
|
break;
|
| 714 |
|
|
else
|
| 715 |
|
|
continue;
|
| 716 |
|
|
|
| 717 |
|
|
f->fn_state |= DN_S_ACCESSED;
|
| 718 |
|
|
|
| 719 |
|
|
if (f->fn_state&DN_S_ZOMBIE)
|
| 720 |
|
|
continue;
|
| 721 |
|
|
if (f->fn_scope < key->scope)
|
| 722 |
|
|
continue;
|
| 723 |
|
|
|
| 724 |
|
|
err = dn_fib_semantic_match(f->fn_type, DN_FIB_INFO(f), key, res);
|
| 725 |
|
|
if (err == 0) {
|
| 726 |
|
|
res->type = f->fn_type;
|
| 727 |
|
|
res->scope = f->fn_scope;
|
| 728 |
|
|
res->prefixlen = dz->dz_order;
|
| 729 |
|
|
goto out;
|
| 730 |
|
|
}
|
| 731 |
|
|
if (err < 0)
|
| 732 |
|
|
goto out;
|
| 733 |
|
|
}
|
| 734 |
|
|
}
|
| 735 |
|
|
err = 1;
|
| 736 |
|
|
out:
|
| 737 |
|
|
read_unlock(&dn_fib_tables_lock);
|
| 738 |
|
|
return err;
|
| 739 |
|
|
}
|
| 740 |
|
|
|
| 741 |
|
|
#ifdef CONFIG_PROC_FS
|
| 742 |
|
|
|
| 743 |
|
|
static unsigned dn_fib_flag_trans(int type, int dead, u16 mask, struct dn_fib_info *fi)
|
| 744 |
|
|
{
|
| 745 |
|
|
static unsigned type2flags[RTN_MAX+1] = {
|
| 746 |
|
|
0, 0, 0, 0, 0, 0, 0, RTF_REJECT, RTF_REJECT, 0, 0, 0
|
| 747 |
|
|
};
|
| 748 |
|
|
unsigned flags = type2flags[type];
|
| 749 |
|
|
|
| 750 |
|
|
if (fi && fi->fib_nh->nh_gw)
|
| 751 |
|
|
flags |= RTF_GATEWAY;
|
| 752 |
|
|
if (mask == 0xFFFF)
|
| 753 |
|
|
flags |= RTF_HOST;
|
| 754 |
|
|
if (dead)
|
| 755 |
|
|
flags |= RTF_UP;
|
| 756 |
|
|
return flags;
|
| 757 |
|
|
}
|
| 758 |
|
|
|
| 759 |
|
|
static void dn_fib_node_get_info(int type, int dead, struct dn_fib_info *fi, u16 prefix, u16 mask, char *buffer)
|
| 760 |
|
|
{
|
| 761 |
|
|
int len;
|
| 762 |
|
|
unsigned flags = dn_fib_flag_trans(type, dead, mask, fi);
|
| 763 |
|
|
|
| 764 |
|
|
if (fi) {
|
| 765 |
|
|
len = sprintf(buffer, "%s\t%04x\t%04x\t%04x\t%d\t%u\t%d\t%04x\t%d\t%u\t%u",
|
| 766 |
|
|
fi->fib_dev ? fi->fib_dev->name : "*", prefix,
|
| 767 |
|
|
fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
|
| 768 |
|
|
mask, 0, 0, 0);
|
| 769 |
|
|
} else {
|
| 770 |
|
|
len = sprintf(buffer, "*\t%04x\t%04x\t%04x\t%d\t%u\t%d\t%04x\t%d\t%u\t%u",
|
| 771 |
|
|
prefix, 0,
|
| 772 |
|
|
flags, 0, 0, 0,
|
| 773 |
|
|
mask, 0, 0, 0);
|
| 774 |
|
|
}
|
| 775 |
|
|
memset(buffer+len, ' ', 127-len);
|
| 776 |
|
|
buffer[127] = '\n';
|
| 777 |
|
|
}
|
| 778 |
|
|
|
| 779 |
|
|
static int dn_fib_table_get_info(struct dn_fib_table *tb, char *buffer, int first, int count)
|
| 780 |
|
|
{
|
| 781 |
|
|
struct dn_hash *table = (struct dn_hash *)tb->data;
|
| 782 |
|
|
struct dn_zone *dz;
|
| 783 |
|
|
int pos = 0;
|
| 784 |
|
|
int n = 0;
|
| 785 |
|
|
|
| 786 |
|
|
read_lock(&dn_fib_tables_lock);
|
| 787 |
|
|
for(dz = table->dh_zone_list; dz; dz = dz->dz_next) {
|
| 788 |
|
|
int i;
|
| 789 |
|
|
struct dn_fib_node *f;
|
| 790 |
|
|
int maxslot = dz->dz_divisor;
|
| 791 |
|
|
struct dn_fib_node **fp = dz->dz_hash;
|
| 792 |
|
|
|
| 793 |
|
|
if (dz->dz_nent == 0)
|
| 794 |
|
|
continue;
|
| 795 |
|
|
|
| 796 |
|
|
if (pos + dz->dz_nent < first) {
|
| 797 |
|
|
pos += dz->dz_nent;
|
| 798 |
|
|
continue;
|
| 799 |
|
|
}
|
| 800 |
|
|
|
| 801 |
|
|
for(i = 0; i < maxslot; i++, fp++) {
|
| 802 |
|
|
for(f = *fp; f ; f = f->fn_next) {
|
| 803 |
|
|
if (++pos <= first)
|
| 804 |
|
|
continue;
|
| 805 |
|
|
dn_fib_node_get_info(f->fn_type,
|
| 806 |
|
|
f->fn_state & DN_S_ZOMBIE,
|
| 807 |
|
|
DN_FIB_INFO(f),
|
| 808 |
|
|
dz_prefix(f->fn_key, dz),
|
| 809 |
|
|
DZ_MASK(dz), buffer);
|
| 810 |
|
|
buffer += 128;
|
| 811 |
|
|
if (++n >= count)
|
| 812 |
|
|
goto out;
|
| 813 |
|
|
}
|
| 814 |
|
|
}
|
| 815 |
|
|
}
|
| 816 |
|
|
out:
|
| 817 |
|
|
read_unlock(&dn_fib_tables_lock);
|
| 818 |
|
|
return n;
|
| 819 |
|
|
}
|
| 820 |
|
|
#endif /* CONFIG_PROC_FS */
|
| 821 |
|
|
|
| 822 |
|
|
struct dn_fib_table *dn_fib_get_table(int n, int create)
|
| 823 |
|
|
{
|
| 824 |
|
|
struct dn_fib_table *t;
|
| 825 |
|
|
|
| 826 |
|
|
if (n < DN_MIN_TABLE)
|
| 827 |
|
|
return NULL;
|
| 828 |
|
|
|
| 829 |
|
|
if (n > DN_NUM_TABLES)
|
| 830 |
|
|
return NULL;
|
| 831 |
|
|
|
| 832 |
|
|
if (dn_fib_tables[n])
|
| 833 |
|
|
return dn_fib_tables[n];
|
| 834 |
|
|
|
| 835 |
|
|
if (!create)
|
| 836 |
|
|
return NULL;
|
| 837 |
|
|
|
| 838 |
|
|
if (in_interrupt() && net_ratelimit()) {
|
| 839 |
|
|
printk(KERN_DEBUG "DECnet: BUG! Attempt to create routing table from interrupt\n");
|
| 840 |
|
|
return NULL;
|
| 841 |
|
|
}
|
| 842 |
|
|
if ((t = kmalloc(sizeof(struct dn_fib_table), GFP_KERNEL)) == NULL)
|
| 843 |
|
|
return NULL;
|
| 844 |
|
|
|
| 845 |
|
|
memset(t, 0, sizeof(struct dn_fib_table));
|
| 846 |
|
|
|
| 847 |
|
|
t->n = n;
|
| 848 |
|
|
t->insert = dn_fib_table_insert;
|
| 849 |
|
|
t->delete = dn_fib_table_delete;
|
| 850 |
|
|
t->lookup = dn_fib_table_lookup;
|
| 851 |
|
|
t->flush = dn_fib_table_flush;
|
| 852 |
|
|
#ifdef CONFIG_PROC_FS
|
| 853 |
|
|
t->get_info = dn_fib_table_get_info;
|
| 854 |
|
|
#endif
|
| 855 |
|
|
t->dump = dn_fib_table_dump;
|
| 856 |
|
|
dn_fib_tables[n] = t;
|
| 857 |
|
|
|
| 858 |
|
|
return t;
|
| 859 |
|
|
}
|
| 860 |
|
|
|
| 861 |
|
|
static void dn_fib_del_tree(int n)
|
| 862 |
|
|
{
|
| 863 |
|
|
struct dn_fib_table *t;
|
| 864 |
|
|
|
| 865 |
|
|
write_lock(&dn_fib_tables_lock);
|
| 866 |
|
|
t = dn_fib_tables[n];
|
| 867 |
|
|
dn_fib_tables[n] = NULL;
|
| 868 |
|
|
write_unlock(&dn_fib_tables_lock);
|
| 869 |
|
|
|
| 870 |
|
|
if (t) {
|
| 871 |
|
|
kfree(t);
|
| 872 |
|
|
}
|
| 873 |
|
|
}
|
| 874 |
|
|
|
| 875 |
|
|
struct dn_fib_table *dn_fib_empty_table(void)
|
| 876 |
|
|
{
|
| 877 |
|
|
int id;
|
| 878 |
|
|
|
| 879 |
|
|
for(id = DN_MIN_TABLE; id <= DN_NUM_TABLES; id++)
|
| 880 |
|
|
if (dn_fib_tables[id] == NULL)
|
| 881 |
|
|
return dn_fib_get_table(id, 1);
|
| 882 |
|
|
return NULL;
|
| 883 |
|
|
}
|
| 884 |
|
|
|
| 885 |
|
|
void __init dn_fib_table_init(void)
|
| 886 |
|
|
{
|
| 887 |
|
|
dn_hash_kmem = kmem_cache_create("dn_fib_info_cache",
|
| 888 |
|
|
sizeof(struct dn_fib_info),
|
| 889 |
|
|
0, SLAB_HWCACHE_ALIGN,
|
| 890 |
|
|
NULL, NULL);
|
| 891 |
|
|
}
|
| 892 |
|
|
|
| 893 |
|
|
void __exit dn_fib_table_cleanup(void)
|
| 894 |
|
|
{
|
| 895 |
|
|
int i;
|
| 896 |
|
|
|
| 897 |
|
|
for (i = 0; i < DN_NUM_TABLES + 1; ++i)
|
| 898 |
|
|
dn_fib_del_tree(i);
|
| 899 |
|
|
|
| 900 |
|
|
return;
|
| 901 |
|
|
}
|
