[IPV6]: Policy Routing Rules

Adds support for policy routing rules including a new
local table for routes with a local destination.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 251 insertions, 0 deletions

diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
new file mode 100644
index 0000000..c3c8195
--- /dev/null
+++ b/net/ipv6/fib6_rules.c
@@ -0,0 +1,251 @@
+/*
+ * net/ipv6/fib6_rules.c	IPv6 Routing Policy Rules
+ *
+ * Copyright (C)2003-2006 Helsinki University of Technology
+ * Copyright (C)2003-2006 USAGI/WIDE Project
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License as
+ *	published by the Free Software Foundation, version 2.
+ *
+ * Authors
+ *	Thomas Graf		<tgraf@suug.ch>
+ *	Ville Nuorvala		<vnuorval@tcs.hut.fi>
+ */
+
+#include <linux/config.h>
+#include <linux/netdevice.h>
+
+#include <net/fib_rules.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/netlink.h>
+
+struct fib6_rule
+{
+	struct fib_rule		common;
+	struct rt6key		src;
+	struct rt6key		dst;
+	u8			tclass;
+};
+
+static struct fib_rules_ops fib6_rules_ops;
+
+static struct fib6_rule main_rule = {
+	.common = {
+		.refcnt =	ATOMIC_INIT(2),
+		.pref =		0x7FFE,
+		.action =	FR_ACT_TO_TBL,
+		.table =	RT6_TABLE_MAIN,
+	},
+};
+
+static struct fib6_rule local_rule = {
+	.common = {
+		.refcnt =	ATOMIC_INIT(2),
+		.pref =		0,
+		.action =	FR_ACT_TO_TBL,
+		.table =	RT6_TABLE_LOCAL,
+		.flags =	FIB_RULE_PERMANENT,
+	},
+};
+
+static LIST_HEAD(fib6_rules);
+
+struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
+				   pol_lookup_t lookup)
+{
+	struct fib_lookup_arg arg = {
+		.lookup_ptr = lookup,
+	};
+
+	fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
+	if (arg.rule)
+		fib_rule_put(arg.rule);
+
+	return (struct dst_entry *) arg.result;
+}
+
+int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
+		     int flags, struct fib_lookup_arg *arg)
+{
+	struct rt6_info *rt = NULL;
+	struct fib6_table *table;
+	pol_lookup_t lookup = arg->lookup_ptr;
+
+	switch (rule->action) {
+	case FR_ACT_TO_TBL:
+		break;
+	case FR_ACT_UNREACHABLE:
+		rt = &ip6_null_entry;
+		goto discard_pkt;
+	default:
+	case FR_ACT_BLACKHOLE:
+		rt = &ip6_blk_hole_entry;
+		goto discard_pkt;
+	case FR_ACT_PROHIBIT:
+		rt = &ip6_prohibit_entry;
+		goto discard_pkt;
+	}
+
+	table = fib6_get_table(rule->table);
+	if (table)
+		rt = lookup(table, flp, flags);
+
+	if (rt != &ip6_null_entry)
+		goto out;
+
+	dst_release(&rt->u.dst);
+discard_pkt:
+	dst_hold(&rt->u.dst);
+out:
+	arg->result = rt;
+	return rt == NULL ? -EAGAIN : 0;
+}
+
+
+static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
+{
+	struct fib6_rule *r = (struct fib6_rule *) rule;
+
+	if (!ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
+		return 0;
+
+	if ((flags & RT6_F_HAS_SADDR) &&
+	    !ipv6_prefix_equal(&fl->fl6_src, &r->src.addr, r->src.plen))
+		return 0;
+
+	return 1;
+}
+
+static struct nla_policy fib6_rule_policy[RTA_MAX+1] __read_mostly = {
+	[FRA_IFNAME]	= { .type = NLA_STRING },
+	[FRA_PRIORITY]	= { .type = NLA_U32 },
+	[FRA_SRC]	= { .minlen = sizeof(struct in6_addr) },
+	[FRA_DST]	= { .minlen = sizeof(struct in6_addr) },
+};
+
+static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
+			       struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
+			       struct nlattr **tb)
+{
+	int err = -EINVAL;
+	struct fib6_rule *rule6 = (struct fib6_rule *) rule;
+
+	if (frh->src_len > 128 || frh->dst_len > 128 ||
+	    (frh->tos & ~IPV6_FLOWINFO_MASK))
+		goto errout;
+
+	if (rule->action == FR_ACT_TO_TBL) {
+		if (rule->table == RT6_TABLE_UNSPEC)
+			goto errout;
+
+		if (fib6_new_table(rule->table) == NULL) {
+			err = -ENOBUFS;
+			goto errout;
+		}
+	}
+
+	if (tb[FRA_SRC])
+		nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
+			   sizeof(struct in6_addr));
+
+	if (tb[FRA_DST])
+		nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
+			   sizeof(struct in6_addr));
+
+	rule6->src.plen = frh->src_len;
+	rule6->dst.plen = frh->dst_len;
+	rule6->tclass = frh->tos;
+
+	err = 0;
+errout:
+	return err;
+}
+
+static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
+			     struct nlattr **tb)
+{
+	struct fib6_rule *rule6 = (struct fib6_rule *) rule;
+
+	if (frh->src_len && (rule6->src.plen != frh->src_len))
+		return 0;
+
+	if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
+		return 0;
+
+	if (frh->tos && (rule6->tclass != frh->tos))
+		return 0;
+
+	if (tb[FRA_SRC] &&
+	    nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
+		return 0;
+
+	if (tb[FRA_DST] &&
+	    nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
+		return 0;
+
+	return 1;
+}
+
+static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
+			  struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
+{
+	struct fib6_rule *rule6 = (struct fib6_rule *) rule;
+
+	frh->family = AF_INET6;
+	frh->dst_len = rule6->dst.plen;
+	frh->src_len = rule6->src.plen;
+	frh->tos = rule6->tclass;
+
+	if (rule6->dst.plen)
+		NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
+			&rule6->dst.addr);
+
+	if (rule6->src.plen)
+		NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
+			&rule6->src.addr);
+
+	return 0;
+
+nla_put_failure:
+	return -ENOBUFS;
+}
+
+int fib6_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	return fib_rules_dump(skb, cb, AF_INET6);
+}
+
+static u32 fib6_rule_default_pref(void)
+{
+	return 0x3FFF;
+}
+
+static struct fib_rules_ops fib6_rules_ops = {
+	.family			= AF_INET6,
+	.rule_size		= sizeof(struct fib6_rule),
+	.action			= fib6_rule_action,
+	.match			= fib6_rule_match,
+	.configure		= fib6_rule_configure,
+	.compare		= fib6_rule_compare,
+	.fill			= fib6_rule_fill,
+	.default_pref		= fib6_rule_default_pref,
+	.nlgroup		= RTNLGRP_IPV6_RULE,
+	.policy			= fib6_rule_policy,
+	.rules_list		= &fib6_rules,
+	.owner			= THIS_MODULE,
+};
+
+void __init fib6_rules_init(void)
+{
+	list_add_tail(&local_rule.common.list, &fib6_rules);
+	list_add_tail(&main_rule.common.list, &fib6_rules);
+
+	fib_rules_register(&fib6_rules_ops);
+}
+
+void fib6_rules_cleanup(void)
+{
+	fib_rules_unregister(&fib6_rules_ops);
+}