/* * 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, .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(); }