1 // SPDX-License-Identifier: GPL-2.0
4 * DECnet An implementation of the DECnet protocol suite for the LINUX
5 * operating system. DECnet is implemented using the BSD Socket
6 * interface as the means of communication with the user level.
8 * DECnet Routing Forwarding Information Base (Rules)
10 * Author: Steve Whitehouse <SteveW@ACM.org>
11 * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
15 * Steve Whitehouse <steve@chygwyn.com>
16 * Updated for Thomas Graf's generic rules
19 #include <linux/net.h>
20 #include <linux/init.h>
21 #include <linux/netlink.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/netdevice.h>
24 #include <linux/spinlock.h>
25 #include <linux/list.h>
26 #include <linux/rcupdate.h>
27 #include <linux/export.h>
28 #include <net/neighbour.h>
31 #include <net/fib_rules.h>
33 #include <net/dn_fib.h>
34 #include <net/dn_neigh.h>
35 #include <net/dn_dev.h>
36 #include <net/dn_route.h>
38 static struct fib_rules_ops *dn_fib_rules_ops;
42 struct fib_rule common;
43 unsigned char dst_len;
44 unsigned char src_len;
54 int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res)
56 struct fib_lookup_arg arg = {
61 err = fib_rules_lookup(dn_fib_rules_ops,
62 flowidn_to_flowi(flp), 0, &arg);
68 static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
69 int flags, struct fib_lookup_arg *arg)
71 struct flowidn *fld = &flp->u.dn;
73 struct dn_fib_table *tbl;
75 switch(rule->action) {
79 case FR_ACT_UNREACHABLE:
87 case FR_ACT_BLACKHOLE:
93 tbl = dn_fib_get_table(rule->table, 0);
97 err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result);
104 static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
106 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
107 struct flowidn *fld = &fl->u.dn;
108 __le16 daddr = fld->daddr;
109 __le16 saddr = fld->saddr;
111 if (((saddr ^ r->src) & r->srcmask) ||
112 ((daddr ^ r->dst) & r->dstmask))
118 static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
119 struct fib_rule_hdr *frh,
121 struct netlink_ext_ack *extack)
124 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
127 NL_SET_ERR_MSG(extack, "Invalid tos value");
131 if (rule->table == RT_TABLE_UNSPEC) {
132 if (rule->action == FR_ACT_TO_TBL) {
133 struct dn_fib_table *table;
135 table = dn_fib_empty_table();
141 rule->table = table->n;
146 r->src = nla_get_le16(tb[FRA_SRC]);
149 r->dst = nla_get_le16(tb[FRA_DST]);
151 r->src_len = frh->src_len;
152 r->srcmask = dnet_make_mask(r->src_len);
153 r->dst_len = frh->dst_len;
154 r->dstmask = dnet_make_mask(r->dst_len);
160 static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
163 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
165 if (frh->src_len && (r->src_len != frh->src_len))
168 if (frh->dst_len && (r->dst_len != frh->dst_len))
171 if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
174 if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
180 unsigned int dnet_addr_type(__le16 addr)
182 struct flowidn fld = { .daddr = addr };
183 struct dn_fib_res res;
184 unsigned int ret = RTN_UNICAST;
185 struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
190 if (!tb->lookup(tb, &fld, &res)) {
192 dn_fib_res_put(&res);
198 static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
199 struct fib_rule_hdr *frh)
201 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
203 frh->dst_len = r->dst_len;
204 frh->src_len = r->src_len;
208 nla_put_le16(skb, FRA_DST, r->dst)) ||
210 nla_put_le16(skb, FRA_SRC, r->src)))
211 goto nla_put_failure;
218 static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
220 dn_rt_cache_flush(-1);
223 static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = {
225 .rule_size = sizeof(struct dn_fib_rule),
226 .addr_size = sizeof(u16),
227 .action = dn_fib_rule_action,
228 .match = dn_fib_rule_match,
229 .configure = dn_fib_rule_configure,
230 .compare = dn_fib_rule_compare,
231 .fill = dn_fib_rule_fill,
232 .flush_cache = dn_fib_rule_flush_cache,
233 .nlgroup = RTNLGRP_DECnet_RULE,
234 .owner = THIS_MODULE,
235 .fro_net = &init_net,
238 void __init dn_fib_rules_init(void)
241 fib_rules_register(&dn_fib_rules_ops_template, &init_net);
242 BUG_ON(IS_ERR(dn_fib_rules_ops));
243 BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff,
247 void __exit dn_fib_rules_cleanup(void)
250 fib_rules_unregister(dn_fib_rules_ops);