305 lines
6.7 KiB
C
305 lines
6.7 KiB
C
/*
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* net/ipv6/fib6_rules.c IPv6 Routing Policy Rules
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*
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* Copyright (C)2003-2006 Helsinki University of Technology
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* Copyright (C)2003-2006 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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* Authors
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* Thomas Graf <tgraf@suug.ch>
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* Ville Nuorvala <vnuorval@tcs.hut.fi>
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*/
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#include <linux/netdevice.h>
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#include <net/fib_rules.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <net/netlink.h>
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struct fib6_rule
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{
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struct fib_rule common;
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struct rt6key src;
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struct rt6key dst;
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#ifdef CONFIG_IPV6_ROUTE_FWMARK
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u32 fwmark;
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u32 fwmask;
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#endif
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u8 tclass;
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};
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static struct fib_rules_ops fib6_rules_ops;
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static struct fib6_rule main_rule = {
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.common = {
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.refcnt = ATOMIC_INIT(2),
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.pref = 0x7FFE,
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.action = FR_ACT_TO_TBL,
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.table = RT6_TABLE_MAIN,
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},
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};
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static struct fib6_rule local_rule = {
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.common = {
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.refcnt = ATOMIC_INIT(2),
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.pref = 0,
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.action = FR_ACT_TO_TBL,
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.table = RT6_TABLE_LOCAL,
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.flags = FIB_RULE_PERMANENT,
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},
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};
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static LIST_HEAD(fib6_rules);
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struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
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pol_lookup_t lookup)
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{
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struct fib_lookup_arg arg = {
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.lookup_ptr = lookup,
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};
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fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
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if (arg.rule)
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fib_rule_put(arg.rule);
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if (arg.result)
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return (struct dst_entry *) arg.result;
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dst_hold(&ip6_null_entry.u.dst);
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return &ip6_null_entry.u.dst;
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}
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static int fib6_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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struct rt6_info *rt = NULL;
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struct fib6_table *table;
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pol_lookup_t lookup = arg->lookup_ptr;
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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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rt = &ip6_null_entry;
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goto discard_pkt;
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default:
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case FR_ACT_BLACKHOLE:
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rt = &ip6_blk_hole_entry;
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goto discard_pkt;
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case FR_ACT_PROHIBIT:
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rt = &ip6_prohibit_entry;
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goto discard_pkt;
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}
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table = fib6_get_table(rule->table);
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if (table)
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rt = lookup(table, flp, flags);
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if (rt != &ip6_null_entry)
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goto out;
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dst_release(&rt->u.dst);
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rt = NULL;
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goto out;
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discard_pkt:
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dst_hold(&rt->u.dst);
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out:
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arg->result = rt;
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return rt == NULL ? -EAGAIN : 0;
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}
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static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
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{
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struct fib6_rule *r = (struct fib6_rule *) rule;
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if (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
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return 0;
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if ((flags & RT6_LOOKUP_F_HAS_SADDR) &&
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!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
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return 0;
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if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
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return 0;
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#ifdef CONFIG_IPV6_ROUTE_FWMARK
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if ((r->fwmark ^ fl->fl6_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 struct nla_policy fib6_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] = { .len = sizeof(struct in6_addr) },
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[FRA_DST] = { .len = sizeof(struct in6_addr) },
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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 fib6_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 fib6_rule *rule6 = (struct fib6_rule *) rule;
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if (frh->src_len > 128 || frh->dst_len > 128 ||
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(frh->tos & ~IPV6_FLOWINFO_MASK))
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goto errout;
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if (rule->action == FR_ACT_TO_TBL) {
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if (rule->table == RT6_TABLE_UNSPEC)
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goto errout;
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if (fib6_new_table(rule->table) == NULL) {
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err = -ENOBUFS;
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goto errout;
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}
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}
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if (tb[FRA_SRC])
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nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
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sizeof(struct in6_addr));
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if (tb[FRA_DST])
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nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
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sizeof(struct in6_addr));
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#ifdef CONFIG_IPV6_ROUTE_FWMARK
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if (tb[FRA_FWMARK]) {
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rule6->fwmark = nla_get_u32(tb[FRA_FWMARK]);
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if (rule6->fwmark) {
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/*
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* if the mark value is non-zero,
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* all bits are compared by default
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* unless a mask is explicitly specified.
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*/
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rule6->fwmask = 0xFFFFFFFF;
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}
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}
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if (tb[FRA_FWMASK])
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rule6->fwmask = nla_get_u32(tb[FRA_FWMASK]);
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#endif
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rule6->src.plen = frh->src_len;
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rule6->dst.plen = frh->dst_len;
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rule6->tclass = frh->tos;
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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 fib6_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 fib6_rule *rule6 = (struct fib6_rule *) rule;
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if (frh->src_len && (rule6->src.plen != frh->src_len))
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return 0;
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if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
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return 0;
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if (frh->tos && (rule6->tclass != frh->tos))
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return 0;
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if (tb[FRA_SRC] &&
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nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
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return 0;
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if (tb[FRA_DST] &&
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nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
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return 0;
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#ifdef CONFIG_IPV6_ROUTE_FWMARK
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if (tb[FRA_FWMARK] && (rule6->fwmark != nla_get_u32(tb[FRA_FWMARK])))
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return 0;
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if (tb[FRA_FWMASK] && (rule6->fwmask != nla_get_u32(tb[FRA_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 fib6_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 fib6_rule *rule6 = (struct fib6_rule *) rule;
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frh->family = AF_INET6;
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frh->dst_len = rule6->dst.plen;
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frh->src_len = rule6->src.plen;
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frh->tos = rule6->tclass;
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if (rule6->dst.plen)
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NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
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&rule6->dst.addr);
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if (rule6->src.plen)
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NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
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&rule6->src.addr);
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#ifdef CONFIG_IPV6_ROUTE_FWMARK
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if (rule6->fwmark)
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NLA_PUT_U32(skb, FRA_FWMARK, rule6->fwmark);
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if (rule6->fwmask || rule6->fwmark)
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NLA_PUT_U32(skb, FRA_FWMASK, rule6->fwmask);
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#endif
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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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int fib6_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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return fib_rules_dump(skb, cb, AF_INET6);
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}
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static u32 fib6_rule_default_pref(void)
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{
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return 0x3FFF;
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}
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static struct fib_rules_ops fib6_rules_ops = {
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.family = AF_INET6,
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.rule_size = sizeof(struct fib6_rule),
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.action = fib6_rule_action,
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.match = fib6_rule_match,
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.configure = fib6_rule_configure,
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.compare = fib6_rule_compare,
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.fill = fib6_rule_fill,
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.default_pref = fib6_rule_default_pref,
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.nlgroup = RTNLGRP_IPV6_RULE,
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.policy = fib6_rule_policy,
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.rules_list = &fib6_rules,
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.owner = THIS_MODULE,
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};
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void __init fib6_rules_init(void)
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{
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list_add_tail(&local_rule.common.list, &fib6_rules);
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list_add_tail(&main_rule.common.list, &fib6_rules);
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fib_rules_register(&fib6_rules_ops);
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}
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void fib6_rules_cleanup(void)
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{
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fib_rules_unregister(&fib6_rules_ops);
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}
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