3 * DECnet An implementation of the DECnet protocol suite for the LINUX
4 * operating system. DECnet is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
7 * DECnet Routing Forwarding Information Base (Rules)
9 * Author: Steve Whitehouse <SteveW@ACM.org>
10 * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
14 * Steve Whitehouse <steve@chygwyn.com>
15 * Updated for Thomas Graf's generic rules
18 #include <linux/net.h>
19 #include <linux/init.h>
20 #include <linux/netlink.h>
21 #include <linux/rtnetlink.h>
22 #include <linux/netdevice.h>
23 #include <linux/spinlock.h>
24 #include <linux/list.h>
25 #include <linux/rcupdate.h>
26 #include <net/neighbour.h>
29 #include <net/fib_rules.h>
31 #include <net/dn_fib.h>
32 #include <net/dn_neigh.h>
33 #include <net/dn_dev.h>
34 #include <net/dn_route.h>
36 static struct fib_rules_ops dn_fib_rules_ops;
40 struct fib_rule common;
41 unsigned char dst_len;
42 unsigned char src_len;
51 static struct dn_fib_rule default_rule = {
53 .refcnt = ATOMIC_INIT(2),
55 .table = RT_TABLE_MAIN,
56 .action = FR_ACT_TO_TBL,
61 int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res)
63 struct fib_lookup_arg arg = {
68 err = fib_rules_lookup(&dn_fib_rules_ops, flp, 0, &arg);
74 static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
75 int flags, struct fib_lookup_arg *arg)
78 struct dn_fib_table *tbl;
80 switch(rule->action) {
84 case FR_ACT_UNREACHABLE:
92 case FR_ACT_BLACKHOLE:
98 tbl = dn_fib_get_table(rule->table, 0);
102 err = tbl->lookup(tbl, flp, (struct dn_fib_res *)arg->result);
109 static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = {
113 static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
115 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
116 __le16 daddr = fl->fld_dst;
117 __le16 saddr = fl->fld_src;
119 if (((saddr ^ r->src) & r->srcmask) ||
120 ((daddr ^ r->dst) & r->dstmask))
126 static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
127 struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
131 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
136 if (rule->table == RT_TABLE_UNSPEC) {
137 if (rule->action == FR_ACT_TO_TBL) {
138 struct dn_fib_table *table;
140 table = dn_fib_empty_table();
146 rule->table = table->n;
151 r->src = nla_get_le16(tb[FRA_SRC]);
154 r->dst = nla_get_le16(tb[FRA_DST]);
156 r->src_len = frh->src_len;
157 r->srcmask = dnet_make_mask(r->src_len);
158 r->dst_len = frh->dst_len;
159 r->dstmask = dnet_make_mask(r->dst_len);
165 static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
168 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
170 if (frh->src_len && (r->src_len != frh->src_len))
173 if (frh->dst_len && (r->dst_len != frh->dst_len))
176 if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
179 if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
185 unsigned dnet_addr_type(__le16 addr)
187 struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
188 struct dn_fib_res res;
189 unsigned ret = RTN_UNICAST;
190 struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
195 if (!tb->lookup(tb, &fl, &res)) {
197 dn_fib_res_put(&res);
203 static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
204 struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
206 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
208 frh->family = AF_DECnet;
209 frh->dst_len = r->dst_len;
210 frh->src_len = r->src_len;
214 NLA_PUT_LE16(skb, FRA_DST, r->dst);
216 NLA_PUT_LE16(skb, FRA_SRC, r->src);
224 static u32 dn_fib_rule_default_pref(void)
226 struct list_head *pos;
227 struct fib_rule *rule;
229 if (!list_empty(&dn_fib_rules_ops.rules_list)) {
230 pos = dn_fib_rules_ops.rules_list.next;
231 if (pos->next != &dn_fib_rules_ops.rules_list) {
232 rule = list_entry(pos->next, struct fib_rule, list);
234 return rule->pref - 1;
241 static void dn_fib_rule_flush_cache(void)
243 dn_rt_cache_flush(-1);
246 static struct fib_rules_ops dn_fib_rules_ops = {
248 .rule_size = sizeof(struct dn_fib_rule),
249 .addr_size = sizeof(u16),
250 .action = dn_fib_rule_action,
251 .match = dn_fib_rule_match,
252 .configure = dn_fib_rule_configure,
253 .compare = dn_fib_rule_compare,
254 .fill = dn_fib_rule_fill,
255 .default_pref = dn_fib_rule_default_pref,
256 .flush_cache = dn_fib_rule_flush_cache,
257 .nlgroup = RTNLGRP_DECnet_RULE,
258 .policy = dn_fib_rule_policy,
259 .rules_list = LIST_HEAD_INIT(dn_fib_rules_ops.rules_list),
260 .owner = THIS_MODULE,
263 void __init dn_fib_rules_init(void)
265 list_add_tail(&default_rule.common.list,
266 &dn_fib_rules_ops.rules_list);
267 fib_rules_register(&dn_fib_rules_ops);
270 void __exit dn_fib_rules_cleanup(void)
272 fib_rules_unregister(&dn_fib_rules_ops);