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1// SPDX-License-Identifier: GPL-2.0
2
3/*
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.
7 *
8 * DECnet Routing Forwarding Information Base (Rules)
9 *
10 * Author: Steve Whitehouse <SteveW@ACM.org>
11 * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
12 *
13 *
14 * Changes:
15 * Steve Whitehouse <steve@chygwyn.com>
16 * Updated for Thomas Graf's generic rules
17 *
18 */
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>
29#include <net/dst.h>
30#include <net/flow.h>
31#include <net/fib_rules.h>
32#include <net/dn.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>
37
38static struct fib_rules_ops *dn_fib_rules_ops;
39
40struct dn_fib_rule
41{
42 struct fib_rule common;
43 unsigned char dst_len;
44 unsigned char src_len;
45 __le16 src;
46 __le16 srcmask;
47 __le16 dst;
48 __le16 dstmask;
49 __le16 srcmap;
50 u8 flags;
51};
52
53
54int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res)
55{
56 struct fib_lookup_arg arg = {
57 .result = res,
58 };
59 int err;
60
61 err = fib_rules_lookup(dn_fib_rules_ops,
62 flowidn_to_flowi(flp), 0, &arg);
63 res->r = arg.rule;
64
65 return err;
66}
67
68static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
69 int flags, struct fib_lookup_arg *arg)
70{
71 struct flowidn *fld = &flp->u.dn;
72 int err = -EAGAIN;
73 struct dn_fib_table *tbl;
74
75 switch(rule->action) {
76 case FR_ACT_TO_TBL:
77 break;
78
79 case FR_ACT_UNREACHABLE:
80 err = -ENETUNREACH;
81 goto errout;
82
83 case FR_ACT_PROHIBIT:
84 err = -EACCES;
85 goto errout;
86
87 case FR_ACT_BLACKHOLE:
88 default:
89 err = -EINVAL;
90 goto errout;
91 }
92
93 tbl = dn_fib_get_table(rule->table, 0);
94 if (tbl == NULL)
95 goto errout;
96
97 err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result);
98 if (err > 0)
99 err = -EAGAIN;
100errout:
101 return err;
102}
103
104static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
105{
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;
110
111 if (((saddr ^ r->src) & r->srcmask) ||
112 ((daddr ^ r->dst) & r->dstmask))
113 return 0;
114
115 return 1;
116}
117
118static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
119 struct fib_rule_hdr *frh,
120 struct nlattr **tb,
121 struct netlink_ext_ack *extack)
122{
123 int err = -EINVAL;
124 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
125
126 if (frh->tos) {
127 NL_SET_ERR_MSG(extack, "Invalid tos value");
128 goto errout;
129 }
130
131 if (rule->table == RT_TABLE_UNSPEC) {
132 if (rule->action == FR_ACT_TO_TBL) {
133 struct dn_fib_table *table;
134
135 table = dn_fib_empty_table();
136 if (table == NULL) {
137 err = -ENOBUFS;
138 goto errout;
139 }
140
141 rule->table = table->n;
142 }
143 }
144
145 if (frh->src_len)
146 r->src = nla_get_le16(tb[FRA_SRC]);
147
148 if (frh->dst_len)
149 r->dst = nla_get_le16(tb[FRA_DST]);
150
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);
155 err = 0;
156errout:
157 return err;
158}
159
160static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
161 struct nlattr **tb)
162{
163 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
164
165 if (frh->src_len && (r->src_len != frh->src_len))
166 return 0;
167
168 if (frh->dst_len && (r->dst_len != frh->dst_len))
169 return 0;
170
171 if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
172 return 0;
173
174 if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
175 return 0;
176
177 return 1;
178}
179
180unsigned int dnet_addr_type(__le16 addr)
181{
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);
186
187 res.r = NULL;
188
189 if (tb) {
190 if (!tb->lookup(tb, &fld, &res)) {
191 ret = res.type;
192 dn_fib_res_put(&res);
193 }
194 }
195 return ret;
196}
197
198static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
199 struct fib_rule_hdr *frh)
200{
201 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
202
203 frh->dst_len = r->dst_len;
204 frh->src_len = r->src_len;
205 frh->tos = 0;
206
207 if ((r->dst_len &&
208 nla_put_le16(skb, FRA_DST, r->dst)) ||
209 (r->src_len &&
210 nla_put_le16(skb, FRA_SRC, r->src)))
211 goto nla_put_failure;
212 return 0;
213
214nla_put_failure:
215 return -ENOBUFS;
216}
217
218static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
219{
220 dn_rt_cache_flush(-1);
221}
222
223static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = {
224 .family = AF_DECnet,
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,
236};
237
238void __init dn_fib_rules_init(void)
239{
240 dn_fib_rules_ops =
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,
244 RT_TABLE_MAIN, 0));
245}
246
247void __exit dn_fib_rules_cleanup(void)
248{
249 rtnl_lock();
250 fib_rules_unregister(dn_fib_rules_ops);
251 rtnl_unlock();
252 rcu_barrier();
253}