317 lines
6.8 KiB
C
317 lines
6.8 KiB
C
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/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* 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
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*
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*
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* Changes:
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* Steve Whitehouse <steve@chygwyn.com>
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* Updated for Thomas Graf's generic rules
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*
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*/
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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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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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#ifdef CONFIG_DECNET_ROUTE_FWMARK
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u32 fwmark;
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u32 fwmask;
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#endif
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};
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static struct dn_fib_rule default_rule = {
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.common = {
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.refcnt = ATOMIC_INIT(2),
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.pref = 0x7fff,
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.table = RT_TABLE_MAIN,
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.action = FR_ACT_TO_TBL,
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},
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};
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static LIST_HEAD(dn_fib_rules);
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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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return err;
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}
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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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switch(rule->action) {
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case FR_ACT_TO_TBL:
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break;
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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;
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}
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static struct nla_policy dn_fib_rule_policy[FRA_MAX+1] __read_mostly = {
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[FRA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 },
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[FRA_PRIORITY] = { .type = NLA_U32 },
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[FRA_SRC] = { .type = NLA_U16 },
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[FRA_DST] = { .type = NLA_U16 },
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[FRA_FWMARK] = { .type = NLA_U32 },
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[FRA_FWMASK] = { .type = NLA_U32 },
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[FRA_TABLE] = { .type = NLA_U32 },
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};
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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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u16 daddr = fl->fld_dst;
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u16 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;
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#ifdef CONFIG_DECNET_ROUTE_FWMARK
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if ((r->fwmark ^ fl->fld_fwmark) & r->fwmask)
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return 0;
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#endif
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return 1;
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}
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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;
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struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
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if (frh->src_len > 16 || frh->dst_len > 16 || frh->tos)
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goto errout;
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if (rule->table == RT_TABLE_UNSPEC) {
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if (rule->action == FR_ACT_TO_TBL) {
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struct dn_fib_table *table;
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table = dn_fib_empty_table();
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if (table == NULL) {
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err = -ENOBUFS;
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goto errout;
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}
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rule->table = table->n;
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}
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}
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if (tb[FRA_SRC])
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r->src = nla_get_u16(tb[FRA_SRC]);
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if (tb[FRA_DST])
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r->dst = nla_get_u16(tb[FRA_DST]);
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#ifdef CONFIG_DECNET_ROUTE_FWMARK
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if (tb[FRA_FWMARK]) {
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r->fwmark = nla_get_u32(tb[FRA_FWMARK]);
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if (r->fwmark)
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/* compatibility: if the mark value is non-zero all bits
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* are compared unless a mask is explicitly specified.
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*/
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r->fwmask = 0xFFFFFFFF;
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}
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if (tb[FRA_FWMASK])
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r->fwmask = nla_get_u32(tb[FRA_FWMASK]);
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#endif
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r->src_len = frh->src_len;
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r->srcmask = dnet_make_mask(r->src_len);
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r->dst_len = frh->dst_len;
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r->dstmask = dnet_make_mask(r->dst_len);
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err = 0;
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errout:
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return err;
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}
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static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
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struct nlattr **tb)
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{
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struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
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if (frh->src_len && (r->src_len != frh->src_len))
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return 0;
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if (frh->dst_len && (r->dst_len != frh->dst_len))
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return 0;
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#ifdef CONFIG_DECNET_ROUTE_FWMARK
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if (tb[FRA_FWMARK] && (r->fwmark != nla_get_u32(tb[FRA_FWMARK])))
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return 0;
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if (tb[FRA_FWMASK] && (r->fwmask != nla_get_u32(tb[FRA_FWMASK])))
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return 0;
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#endif
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if (tb[FRA_SRC] && (r->src != nla_get_u16(tb[FRA_SRC])))
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return 0;
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if (tb[FRA_DST] && (r->dst != nla_get_u16(tb[FRA_DST])))
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return 0;
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return 1;
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}
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unsigned dnet_addr_type(__le16 addr)
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{
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struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
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struct dn_fib_res res;
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unsigned ret = RTN_UNICAST;
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struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
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res.r = NULL;
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if (tb) {
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if (!tb->lookup(tb, &fl, &res)) {
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ret = res.type;
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dn_fib_res_put(&res);
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}
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}
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return ret;
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}
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static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
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struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
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{
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struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
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frh->family = AF_DECnet;
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frh->dst_len = r->dst_len;
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frh->src_len = r->src_len;
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frh->tos = 0;
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#ifdef CONFIG_DECNET_ROUTE_FWMARK
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if (r->fwmark)
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NLA_PUT_U32(skb, FRA_FWMARK, r->fwmark);
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if (r->fwmask || r->fwmark)
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NLA_PUT_U32(skb, FRA_FWMASK, r->fwmask);
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#endif
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if (r->dst_len)
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NLA_PUT_U16(skb, FRA_DST, r->dst);
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if (r->src_len)
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NLA_PUT_U16(skb, FRA_SRC, r->src);
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return 0;
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nla_put_failure:
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return -ENOBUFS;
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}
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static u32 dn_fib_rule_default_pref(void)
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{
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struct list_head *pos;
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struct fib_rule *rule;
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if (!list_empty(&dn_fib_rules)) {
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pos = dn_fib_rules.next;
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if (pos->next != &dn_fib_rules) {
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rule = list_entry(pos->next, struct fib_rule, list);
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if (rule->pref)
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return rule->pref - 1;
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}
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}
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return 0;
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}
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int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
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{
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return fib_rules_dump(skb, cb, AF_DECnet);
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}
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static struct fib_rules_ops dn_fib_rules_ops = {
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.family = AF_DECnet,
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.rule_size = sizeof(struct dn_fib_rule),
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.action = dn_fib_rule_action,
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.match = dn_fib_rule_match,
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.configure = dn_fib_rule_configure,
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.compare = dn_fib_rule_compare,
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.fill = dn_fib_rule_fill,
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.default_pref = dn_fib_rule_default_pref,
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.nlgroup = RTNLGRP_DECnet_RULE,
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.policy = dn_fib_rule_policy,
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.rules_list = &dn_fib_rules,
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.owner = THIS_MODULE,
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};
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void __init dn_fib_rules_init(void)
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{
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list_add_tail(&default_rule.common.list, &dn_fib_rules);
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fib_rules_register(&dn_fib_rules_ops);
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}
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void __exit dn_fib_rules_cleanup(void)
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{
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fib_rules_unregister(&dn_fib_rules_ops);
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}
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