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96c63fa739
Currently, VRFs require 1 oif and 1 iif rule per address family per VRF. As the number of VRF devices increases it brings scalability issues with the increasing rule list. All of the VRF rules have the same format with the exception of the specific table id to direct the lookup. Since the table id is available from the oif or iif in the loopup, the VRF rules can be consolidated to a single rule that pulls the table from the VRF device. This patch introduces a new rule attribute l3mdev. The l3mdev rule means the table id used for the lookup is pulled from the L3 master device (e.g., VRF) rather than being statically defined. With the l3mdev rule all of the basic VRF FIB rules are reduced to 1 l3mdev rule per address family (IPv4 and IPv6). If an admin wishes to insert higher priority rules for specific VRFs those rules will co-exist with the l3mdev rule. This capability means current VRF scripts will co-exist with this new simpler implementation. Currently, the rules list for both ipv4 and ipv6 look like this: $ ip ru ls 1000: from all oif vrf1 lookup 1001 1000: from all iif vrf1 lookup 1001 1000: from all oif vrf2 lookup 1002 1000: from all iif vrf2 lookup 1002 1000: from all oif vrf3 lookup 1003 1000: from all iif vrf3 lookup 1003 1000: from all oif vrf4 lookup 1004 1000: from all iif vrf4 lookup 1004 1000: from all oif vrf5 lookup 1005 1000: from all iif vrf5 lookup 1005 1000: from all oif vrf6 lookup 1006 1000: from all iif vrf6 lookup 1006 1000: from all oif vrf7 lookup 1007 1000: from all iif vrf7 lookup 1007 1000: from all oif vrf8 lookup 1008 1000: from all iif vrf8 lookup 1008 ... 32765: from all lookup local 32766: from all lookup main 32767: from all lookup default With the l3mdev rule the list is just the following regardless of the number of VRFs: $ ip ru ls 1000: from all lookup [l3mdev table] 32765: from all lookup local 32766: from all lookup main 32767: from all lookup default (Note: the above pretty print of the rule is based on an iproute2 prototype. Actual verbage may change) Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
345 lines
7.7 KiB
C
345 lines
7.7 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 <linux/export.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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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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struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
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int flags, pol_lookup_t lookup)
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{
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struct rt6_info *rt;
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struct fib_lookup_arg arg = {
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.lookup_ptr = lookup,
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.flags = FIB_LOOKUP_NOREF,
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};
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fib_rules_lookup(net->ipv6.fib6_rules_ops,
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flowi6_to_flowi(fl6), flags, &arg);
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rt = arg.result;
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if (!rt) {
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dst_hold(&net->ipv6.ip6_null_entry->dst);
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return &net->ipv6.ip6_null_entry->dst;
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}
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if (rt->rt6i_flags & RTF_REJECT &&
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rt->dst.error == -EAGAIN) {
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ip6_rt_put(rt);
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rt = net->ipv6.ip6_null_entry;
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dst_hold(&rt->dst);
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}
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return &rt->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 flowi6 *flp6 = &flp->u.ip6;
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struct rt6_info *rt = NULL;
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struct fib6_table *table;
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struct net *net = rule->fr_net;
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pol_lookup_t lookup = arg->lookup_ptr;
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int err = 0;
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u32 tb_id;
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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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rt = net->ipv6.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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err = -EINVAL;
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rt = net->ipv6.ip6_blk_hole_entry;
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goto discard_pkt;
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case FR_ACT_PROHIBIT:
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err = -EACCES;
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rt = net->ipv6.ip6_prohibit_entry;
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goto discard_pkt;
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}
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tb_id = fib_rule_get_table(rule, arg);
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table = fib6_get_table(net, tb_id);
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if (!table) {
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err = -EAGAIN;
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goto out;
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}
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rt = lookup(net, table, flp6, flags);
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if (rt != net->ipv6.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_dev_get_saddr(net,
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ip6_dst_idev(&rt->dst)->dev,
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&flp6->daddr,
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rt6_flags2srcprefs(flags),
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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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flp6->saddr = saddr;
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}
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err = rt->dst.error;
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goto out;
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}
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again:
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ip6_rt_put(rt);
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err = -EAGAIN;
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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->dst);
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out:
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arg->result = rt;
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return err;
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}
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static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
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{
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struct rt6_info *rt = (struct rt6_info *) arg->result;
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struct net_device *dev = NULL;
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if (rt->rt6i_idev)
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dev = rt->rt6i_idev->dev;
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/* do not accept result if the route does
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* not meet the required prefix length
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*/
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if (rt->rt6i_dst.plen <= rule->suppress_prefixlen)
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goto suppress_route;
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/* do not accept result if the route uses a device
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* belonging to a forbidden interface group
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*/
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if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
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goto suppress_route;
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return false;
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suppress_route:
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ip6_rt_put(rt);
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return true;
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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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struct flowi6 *fl6 = &fl->u.ip6;
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if (r->dst.plen &&
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!ipv6_prefix_equal(&fl6->daddr, &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(&fl6->saddr, &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 != ip6_tclass(fl6->flowlabel))
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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 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 net *net = sock_net(skb->sk);
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struct fib6_rule *rule6 = (struct fib6_rule *) rule;
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if (rule->action == FR_ACT_TO_TBL && !rule->l3mdev) {
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if (rule->table == RT6_TABLE_UNSPEC)
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goto errout;
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if (fib6_new_table(net, 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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rule6->src.addr = nla_get_in6_addr(tb[FRA_SRC]);
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if (frh->dst_len)
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rule6->dst.addr = nla_get_in6_addr(tb[FRA_DST]);
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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 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->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_in6_addr(skb, FRA_DST, &rule6->dst.addr)) ||
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(rule6->src.plen &&
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nla_put_in6_addr(skb, FRA_SRC, &rule6->src.addr)))
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goto nla_put_failure;
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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 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 const struct fib_rules_ops __net_initconst fib6_rules_ops_template = {
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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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.suppress = fib6_rule_suppress,
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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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.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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.owner = THIS_MODULE,
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.fro_net = &init_net,
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};
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static int __net_init fib6_rules_net_init(struct net *net)
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{
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struct fib_rules_ops *ops;
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int err = -ENOMEM;
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ops = fib_rules_register(&fib6_rules_ops_template, net);
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if (IS_ERR(ops))
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return PTR_ERR(ops);
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err = fib_default_rule_add(ops, 0, RT6_TABLE_LOCAL, 0);
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if (err)
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goto out_fib6_rules_ops;
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err = fib_default_rule_add(ops, 0x7FFE, RT6_TABLE_MAIN, 0);
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if (err)
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goto out_fib6_rules_ops;
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net->ipv6.fib6_rules_ops = ops;
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out:
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return err;
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out_fib6_rules_ops:
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fib_rules_unregister(ops);
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goto out;
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}
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static void __net_exit fib6_rules_net_exit(struct net *net)
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{
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rtnl_lock();
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fib_rules_unregister(net->ipv6.fib6_rules_ops);
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rtnl_unlock();
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}
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static struct pernet_operations fib6_rules_net_ops = {
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.init = fib6_rules_net_init,
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.exit = fib6_rules_net_exit,
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};
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int __init fib6_rules_init(void)
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{
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return register_pernet_subsys(&fib6_rules_net_ops);
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}
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void fib6_rules_cleanup(void)
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{
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unregister_pernet_subsys(&fib6_rules_net_ops);
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}
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