diff options
Diffstat (limited to 'net/decnet/dn_rules.c')
| -rw-r--r-- | net/decnet/dn_rules.c | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c new file mode 100644 index 000000000..9d66a0f72 --- /dev/null +++ b/net/decnet/dn_rules.c @@ -0,0 +1,257 @@ + +/* + * DECnet An implementation of the DECnet protocol suite for the LINUX + * operating system. DECnet is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * DECnet Routing Forwarding Information Base (Rules) + * + * Author: Steve Whitehouse <SteveW@ACM.org> + * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c + * + * + * Changes: + * Steve Whitehouse <steve@chygwyn.com> + * Updated for Thomas Graf's generic rules + * + */ +#include <linux/net.h> +#include <linux/init.h> +#include <linux/netlink.h> +#include <linux/rtnetlink.h> +#include <linux/netdevice.h> +#include <linux/spinlock.h> +#include <linux/list.h> +#include <linux/rcupdate.h> +#include <linux/export.h> +#include <net/neighbour.h> +#include <net/dst.h> +#include <net/flow.h> +#include <net/fib_rules.h> +#include <net/dn.h> +#include <net/dn_fib.h> +#include <net/dn_neigh.h> +#include <net/dn_dev.h> +#include <net/dn_route.h> + +static struct fib_rules_ops *dn_fib_rules_ops; + +struct dn_fib_rule +{ + struct fib_rule common; + unsigned char dst_len; + unsigned char src_len; + __le16 src; + __le16 srcmask; + __le16 dst; + __le16 dstmask; + __le16 srcmap; + u8 flags; +}; + + +int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res) +{ + struct fib_lookup_arg arg = { + .result = res, + }; + int err; + + err = fib_rules_lookup(dn_fib_rules_ops, + flowidn_to_flowi(flp), 0, &arg); + res->r = arg.rule; + + return err; +} + +static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp, + int flags, struct fib_lookup_arg *arg) +{ + struct flowidn *fld = &flp->u.dn; + int err = -EAGAIN; + struct dn_fib_table *tbl; + + switch(rule->action) { + case FR_ACT_TO_TBL: + break; + + case FR_ACT_UNREACHABLE: + err = -ENETUNREACH; + goto errout; + + case FR_ACT_PROHIBIT: + err = -EACCES; + goto errout; + + case FR_ACT_BLACKHOLE: + default: + err = -EINVAL; + goto errout; + } + + tbl = dn_fib_get_table(rule->table, 0); + if (tbl == NULL) + goto errout; + + err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result); + if (err > 0) + err = -EAGAIN; +errout: + return err; +} + +static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = { + FRA_GENERIC_POLICY, +}; + +static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) +{ + struct dn_fib_rule *r = (struct dn_fib_rule *)rule; + struct flowidn *fld = &fl->u.dn; + __le16 daddr = fld->daddr; + __le16 saddr = fld->saddr; + + if (((saddr ^ r->src) & r->srcmask) || + ((daddr ^ r->dst) & r->dstmask)) + return 0; + + return 1; +} + +static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb, + struct fib_rule_hdr *frh, + struct nlattr **tb) +{ + int err = -EINVAL; + struct dn_fib_rule *r = (struct dn_fib_rule *)rule; + + if (frh->tos) + goto errout; + + if (rule->table == RT_TABLE_UNSPEC) { + if (rule->action == FR_ACT_TO_TBL) { + struct dn_fib_table *table; + + table = dn_fib_empty_table(); + if (table == NULL) { + err = -ENOBUFS; + goto errout; + } + + rule->table = table->n; + } + } + + if (frh->src_len) + r->src = nla_get_le16(tb[FRA_SRC]); + + if (frh->dst_len) + r->dst = nla_get_le16(tb[FRA_DST]); + + r->src_len = frh->src_len; + r->srcmask = dnet_make_mask(r->src_len); + r->dst_len = frh->dst_len; + r->dstmask = dnet_make_mask(r->dst_len); + err = 0; +errout: + return err; +} + +static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, + struct nlattr **tb) +{ + struct dn_fib_rule *r = (struct dn_fib_rule *)rule; + + if (frh->src_len && (r->src_len != frh->src_len)) + return 0; + + if (frh->dst_len && (r->dst_len != frh->dst_len)) + return 0; + + if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC]))) + return 0; + + if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST]))) + return 0; + + return 1; +} + +unsigned int dnet_addr_type(__le16 addr) +{ + struct flowidn fld = { .daddr = addr }; + struct dn_fib_res res; + unsigned int ret = RTN_UNICAST; + struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0); + + res.r = NULL; + + if (tb) { + if (!tb->lookup(tb, &fld, &res)) { + ret = res.type; + dn_fib_res_put(&res); + } + } + return ret; +} + +static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb, + struct fib_rule_hdr *frh) +{ + struct dn_fib_rule *r = (struct dn_fib_rule *)rule; + + frh->dst_len = r->dst_len; + frh->src_len = r->src_len; + frh->tos = 0; + + if ((r->dst_len && + nla_put_le16(skb, FRA_DST, r->dst)) || + (r->src_len && + nla_put_le16(skb, FRA_SRC, r->src))) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -ENOBUFS; +} + +static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops) +{ + dn_rt_cache_flush(-1); +} + +static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = { + .family = AF_DECnet, + .rule_size = sizeof(struct dn_fib_rule), + .addr_size = sizeof(u16), + .action = dn_fib_rule_action, + .match = dn_fib_rule_match, + .configure = dn_fib_rule_configure, + .compare = dn_fib_rule_compare, + .fill = dn_fib_rule_fill, + .default_pref = fib_default_rule_pref, + .flush_cache = dn_fib_rule_flush_cache, + .nlgroup = RTNLGRP_DECnet_RULE, + .policy = dn_fib_rule_policy, + .owner = THIS_MODULE, + .fro_net = &init_net, +}; + +void __init dn_fib_rules_init(void) +{ + dn_fib_rules_ops = + fib_rules_register(&dn_fib_rules_ops_template, &init_net); + BUG_ON(IS_ERR(dn_fib_rules_ops)); + BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff, + RT_TABLE_MAIN, 0)); +} + +void __exit dn_fib_rules_cleanup(void) +{ + rtnl_lock(); + fib_rules_unregister(dn_fib_rules_ops); + rtnl_unlock(); + rcu_barrier(); +} + + |