mirror of https://gitee.com/openkylin/linux.git
291 lines
6.4 KiB
C
291 lines
6.4 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/addrconf.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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u8 tclass;
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};
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static struct fib_rules_ops fib6_rules_ops;
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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 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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struct fib6_rule *r = (struct fib6_rule *)rule;
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/*
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* If we need to find a source address for this traffic,
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* we check the result if it meets requirement of the rule.
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*/
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if ((rule->flags & FIB_RULE_FIND_SADDR) &&
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r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
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struct in6_addr saddr;
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if (ipv6_get_saddr(&rt->u.dst, &flp->fl6_dst,
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&saddr))
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goto again;
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if (!ipv6_prefix_equal(&saddr, &r->src.addr,
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r->src.plen))
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goto again;
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ipv6_addr_copy(&flp->fl6_src, &saddr);
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}
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goto out;
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}
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again:
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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 (r->dst.plen &&
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!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
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return 0;
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/*
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* If FIB_RULE_FIND_SADDR is set and we do not have a
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* source address for the traffic, we defer check for
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* source address.
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*/
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if (r->src.plen) {
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if (flags & RT6_LOOKUP_F_HAS_SADDR) {
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if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
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r->src.plen))
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return 0;
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} else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
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return 0;
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}
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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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return 1;
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}
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static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
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FRA_GENERIC_POLICY,
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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 (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 (frh->src_len)
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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 (frh->dst_len)
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nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
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sizeof(struct in6_addr));
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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 (frh->src_len &&
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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 (frh->dst_len &&
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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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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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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 fib6_rule_default_pref(struct fib_rules_ops *ops)
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{
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return 0x3FFF;
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}
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static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
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{
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return nla_total_size(16) /* dst */
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+ nla_total_size(16); /* src */
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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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.addr_size = sizeof(struct in6_addr),
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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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.nlmsg_payload = fib6_rule_nlmsg_payload,
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.nlgroup = RTNLGRP_IPV6_RULE,
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.policy = fib6_rule_policy,
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.rules_list = LIST_HEAD_INIT(fib6_rules_ops.rules_list),
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.owner = THIS_MODULE,
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};
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static int __init fib6_default_rules_init(void)
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{
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int err;
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err = fib_default_rule_add(&fib6_rules_ops, 0,
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RT6_TABLE_LOCAL, FIB_RULE_PERMANENT);
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if (err < 0)
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return err;
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err = fib_default_rule_add(&fib6_rules_ops, 0x7FFE, RT6_TABLE_MAIN, 0);
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if (err < 0)
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return err;
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return 0;
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}
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int __init fib6_rules_init(void)
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{
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int ret;
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ret = fib6_default_rules_init();
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if (ret)
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goto out;
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ret = fib_rules_register(&init_net, &fib6_rules_ops);
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if (ret)
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goto out_default_rules_init;
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out:
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return ret;
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out_default_rules_init:
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fib_rules_cleanup_ops(&fib6_rules_ops);
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goto out;
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}
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void fib6_rules_cleanup(void)
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{
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fib_rules_unregister(&init_net, &fib6_rules_ops);
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}
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