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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [decnet/] [dn_rules.c] - Blame information for rev 3

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Line No. Rev Author Line
1 3 xianfeng 
 
2 
/*
3 
 * DECnet       An implementation of the DECnet protocol suite for the LINUX
4 
 *              operating system.  DECnet is implemented using the  BSD Socket
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 *              interface as the means of communication with the user level.
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 *
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 *              DECnet Routing Forwarding Information Base (Rules)
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 *
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 * Author:      Steve Whitehouse <SteveW@ACM.org>
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 *              Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
11 
 *
12 
 *
13 
 * Changes:
14 
 *              Steve Whitehouse <steve@chygwyn.com>
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 *              Updated for Thomas Graf's generic rules
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 *
17 
 */
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#include <linux/net.h>
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#include <linux/init.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/netdevice.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/rcupdate.h>
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#include <net/neighbour.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <net/fib_rules.h>
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#include <net/dn.h>
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#include <net/dn_fib.h>
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#include <net/dn_neigh.h>
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#include <net/dn_dev.h>
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#include <net/dn_route.h>
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static struct fib_rules_ops dn_fib_rules_ops;
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struct dn_fib_rule
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{
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        struct fib_rule         common;
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        unsigned char           dst_len;
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        unsigned char           src_len;
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        __le16                  src;
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        __le16                  srcmask;
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        __le16                  dst;
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        __le16                  dstmask;
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        __le16                  srcmap;
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        u8                      flags;
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};
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51 
 
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int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res)
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{
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        struct fib_lookup_arg arg = {
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                .result = res,
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        };
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        int err;
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        err = fib_rules_lookup(&dn_fib_rules_ops, flp, 0, &arg);
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        res->r = arg.rule;
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62 
        return err;
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}
64 
 
65 
static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
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                              int flags, struct fib_lookup_arg *arg)
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{
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        int err = -EAGAIN;
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        struct dn_fib_table *tbl;
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71 
        switch(rule->action) {
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        case FR_ACT_TO_TBL:
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                break;
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75 
        case FR_ACT_UNREACHABLE:
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                err = -ENETUNREACH;
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                goto errout;
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        case FR_ACT_PROHIBIT:
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                err = -EACCES;
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                goto errout;
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        case FR_ACT_BLACKHOLE:
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        default:
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                err = -EINVAL;
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                goto errout;
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        }
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        tbl = dn_fib_get_table(rule->table, 0);
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        if (tbl == NULL)
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                goto errout;
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        err = tbl->lookup(tbl, flp, (struct dn_fib_res *)arg->result);
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        if (err > 0)
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                err = -EAGAIN;
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errout:
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        return err;
98 
}
99 
 
100 
static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = {
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        FRA_GENERIC_POLICY,
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};
103 
 
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static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
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{
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        struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
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        __le16 daddr = fl->fld_dst;
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        __le16 saddr = fl->fld_src;
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        if (((saddr ^ r->src) & r->srcmask) ||
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            ((daddr ^ r->dst) & r->dstmask))
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                return 0;
113 
 
114 
        return 1;
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}
116 
 
117 
static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
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                                 struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
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                                 struct nlattr **tb)
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{
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        int err = -EINVAL;
122 
        struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
123 
 
124 
        if (frh->tos)
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                goto  errout;
126 
 
127 
        if (rule->table == RT_TABLE_UNSPEC) {
128 
                if (rule->action == FR_ACT_TO_TBL) {
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                        struct dn_fib_table *table;
130 
 
131 
                        table = dn_fib_empty_table();
132 
                        if (table == NULL) {
133 
                                err = -ENOBUFS;
134 
                                goto errout;
135 
                        }
136 
 
137 
                        rule->table = table->n;
138 
                }
139 
        }
140 
 
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        if (frh->src_len)
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                r->src = nla_get_le16(tb[FRA_SRC]);
143 
 
144 
        if (frh->dst_len)
145 
                r->dst = nla_get_le16(tb[FRA_DST]);
146 
 
147 
        r->src_len = frh->src_len;
148 
        r->srcmask = dnet_make_mask(r->src_len);
149 
        r->dst_len = frh->dst_len;
150 
        r->dstmask = dnet_make_mask(r->dst_len);
151 
        err = 0;
152 
errout:
153 
        return err;
154 
}
155 
 
156 
static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
157 
                               struct nlattr **tb)
158 
{
159 
        struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
160 
 
161 
        if (frh->src_len && (r->src_len != frh->src_len))
162 
                return 0;
163 
 
164 
        if (frh->dst_len && (r->dst_len != frh->dst_len))
165 
                return 0;
166 
 
167 
        if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
168 
                return 0;
169 
 
170 
        if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
171 
                return 0;
172 
 
173 
        return 1;
174 
}
175 
 
176 
unsigned dnet_addr_type(__le16 addr)
177 
{
178 
        struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
179 
        struct dn_fib_res res;
180 
        unsigned ret = RTN_UNICAST;
181 
        struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
182 
 
183 
        res.r = NULL;
184 
 
185 
        if (tb) {
186 
                if (!tb->lookup(tb, &fl, &res)) {
187 
                        ret = res.type;
188 
                        dn_fib_res_put(&res);
189 
                }
190 
        }
191 
        return ret;
192 
}
193 
 
194 
static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
195 
                            struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
196 
{
197 
        struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
198 
 
199 
        frh->family = AF_DECnet;
200 
        frh->dst_len = r->dst_len;
201 
        frh->src_len = r->src_len;
202 
        frh->tos = 0;
203 
 
204 
        if (r->dst_len)
205 
                NLA_PUT_LE16(skb, FRA_DST, r->dst);
206 
        if (r->src_len)
207 
                NLA_PUT_LE16(skb, FRA_SRC, r->src);
208 
 
209 
        return 0;
210 
 
211 
nla_put_failure:
212 
        return -ENOBUFS;
213 
}
214 
 
215 
static u32 dn_fib_rule_default_pref(void)
216 
{
217 
        struct list_head *pos;
218 
        struct fib_rule *rule;
219 
 
220 
        if (!list_empty(&dn_fib_rules_ops.rules_list)) {
221 
                pos = dn_fib_rules_ops.rules_list.next;
222 
                if (pos->next != &dn_fib_rules_ops.rules_list) {
223 
                        rule = list_entry(pos->next, struct fib_rule, list);
224 
                        if (rule->pref)
225 
                                return rule->pref - 1;
226 
                }
227 
        }
228 
 
229 
        return 0;
230 
}
231 
 
232 
static void dn_fib_rule_flush_cache(void)
233 
{
234 
        dn_rt_cache_flush(-1);
235 
}
236 
 
237 
static struct fib_rules_ops dn_fib_rules_ops = {
238 
        .family         = AF_DECnet,
239 
        .rule_size      = sizeof(struct dn_fib_rule),
240 
        .addr_size      = sizeof(u16),
241 
        .action         = dn_fib_rule_action,
242 
        .match          = dn_fib_rule_match,
243 
        .configure      = dn_fib_rule_configure,
244 
        .compare        = dn_fib_rule_compare,
245 
        .fill           = dn_fib_rule_fill,
246 
        .default_pref   = dn_fib_rule_default_pref,
247 
        .flush_cache    = dn_fib_rule_flush_cache,
248 
        .nlgroup        = RTNLGRP_DECnet_RULE,
249 
        .policy         = dn_fib_rule_policy,
250 
        .rules_list     = LIST_HEAD_INIT(dn_fib_rules_ops.rules_list),
251 
        .owner          = THIS_MODULE,
252 
};
253 
 
254 
void __init dn_fib_rules_init(void)
255 
{
256 
        BUG_ON(fib_default_rule_add(&dn_fib_rules_ops, 0x7fff,
257 
                                    RT_TABLE_MAIN, 0));
258 
        fib_rules_register(&dn_fib_rules_ops);
259 
}
260 
 
261 
void __exit dn_fib_rules_cleanup(void)
262 
{
263 
        fib_rules_unregister(&dn_fib_rules_ops);
264 
}
265 
 
266 
 

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