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>
35 static struct fib_rules_ops dn_fib_rules_ops;
39 struct fib_rule common;
40 unsigned char dst_len;
41 unsigned char src_len;
50 static struct dn_fib_rule default_rule = {
52 .refcnt = ATOMIC_INIT(2),
54 .table = RT_TABLE_MAIN,
55 .action = FR_ACT_TO_TBL,
59 static LIST_HEAD(dn_fib_rules);
62 int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res)
64 struct fib_lookup_arg arg = {
69 err = fib_rules_lookup(&dn_fib_rules_ops, flp, 0, &arg);
75 static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
76 int flags, struct fib_lookup_arg *arg)
79 struct dn_fib_table *tbl;
81 switch(rule->action) {
85 case FR_ACT_UNREACHABLE:
93 case FR_ACT_BLACKHOLE:
99 tbl = dn_fib_get_table(rule->table, 0);
103 err = tbl->lookup(tbl, flp, (struct dn_fib_res *)arg->result);
110 static struct nla_policy dn_fib_rule_policy[FRA_MAX+1] __read_mostly = {
114 static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
116 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
117 __le16 daddr = fl->fld_dst;
118 __le16 saddr = fl->fld_src;
120 if (((saddr ^ r->src) & r->srcmask) ||
121 ((daddr ^ r->dst) & r->dstmask))
127 static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
128 struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
132 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
137 if (rule->table == RT_TABLE_UNSPEC) {
138 if (rule->action == FR_ACT_TO_TBL) {
139 struct dn_fib_table *table;
141 table = dn_fib_empty_table();
147 rule->table = table->n;
152 r->src = nla_get_le16(tb[FRA_SRC]);
155 r->dst = nla_get_le16(tb[FRA_DST]);
157 r->src_len = frh->src_len;
158 r->srcmask = dnet_make_mask(r->src_len);
159 r->dst_len = frh->dst_len;
160 r->dstmask = dnet_make_mask(r->dst_len);
166 static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
169 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
171 if (frh->src_len && (r->src_len != frh->src_len))
174 if (frh->dst_len && (r->dst_len != frh->dst_len))
177 if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
180 if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
186 unsigned dnet_addr_type(__le16 addr)
188 struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
189 struct dn_fib_res res;
190 unsigned ret = RTN_UNICAST;
191 struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
196 if (!tb->lookup(tb, &fl, &res)) {
198 dn_fib_res_put(&res);
204 static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
205 struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
207 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
209 frh->family = AF_DECnet;
210 frh->dst_len = r->dst_len;
211 frh->src_len = r->src_len;
215 NLA_PUT_LE16(skb, FRA_DST, r->dst);
217 NLA_PUT_LE16(skb, FRA_SRC, r->src);
225 static u32 dn_fib_rule_default_pref(void)
227 struct list_head *pos;
228 struct fib_rule *rule;
230 if (!list_empty(&dn_fib_rules)) {
231 pos = dn_fib_rules.next;
232 if (pos->next != &dn_fib_rules) {
233 rule = list_entry(pos->next, struct fib_rule, list);
235 return rule->pref - 1;
242 int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
244 return fib_rules_dump(skb, cb, AF_DECnet);
247 static struct fib_rules_ops dn_fib_rules_ops = {
249 .rule_size = sizeof(struct dn_fib_rule),
250 .addr_size = sizeof(u16),
251 .action = dn_fib_rule_action,
252 .match = dn_fib_rule_match,
253 .configure = dn_fib_rule_configure,
254 .compare = dn_fib_rule_compare,
255 .fill = dn_fib_rule_fill,
256 .default_pref = dn_fib_rule_default_pref,
257 .nlgroup = RTNLGRP_DECnet_RULE,
258 .policy = dn_fib_rule_policy,
259 .rules_list = &dn_fib_rules,
260 .owner = THIS_MODULE,
263 void __init dn_fib_rules_init(void)
265 list_add_tail(&default_rule.common.list, &dn_fib_rules);
266 fib_rules_register(&dn_fib_rules_ops);
269 void __exit dn_fib_rules_cleanup(void)
271 fib_rules_unregister(&dn_fib_rules_ops);