Initial import of modified Linux 2.6.28 tree

Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y

1 files changed, 329 insertions, 0 deletions

diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
new file mode 100644
index 0000000..6080d71
--- /dev/null
+++ b/net/ipv4/fib_rules.c
@@ -0,0 +1,329 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		IPv4 Forwarding Information Base: policy rules.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ * 		Thomas Graf <tgraf@suug.ch>
+ *
+ *		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; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Fixes:
+ * 		Rani Assaf	:	local_rule cannot be deleted
+ *		Marc Boucher	:	routing by fwmark
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/netlink.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/rcupdate.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <net/tcp.h>
+#include <net/ip_fib.h>
+#include <net/fib_rules.h>
+
+struct fib4_rule
+{
+	struct fib_rule		common;
+	u8			dst_len;
+	u8			src_len;
+	u8			tos;
+	__be32			src;
+	__be32			srcmask;
+	__be32			dst;
+	__be32			dstmask;
+#ifdef CONFIG_NET_CLS_ROUTE
+	u32			tclassid;
+#endif
+};
+
+#ifdef CONFIG_NET_CLS_ROUTE
+u32 fib_rules_tclass(struct fib_result *res)
+{
+	return res->r ? ((struct fib4_rule *) res->r)->tclassid : 0;
+}
+#endif
+
+int fib_lookup(struct net *net, struct flowi *flp, struct fib_result *res)
+{
+	struct fib_lookup_arg arg = {
+		.result = res,
+	};
+	int err;
+
+	err = fib_rules_lookup(net->ipv4.rules_ops, flp, 0, &arg);
+	res->r = arg.rule;
+
+	return err;
+}
+
+static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
+			    int flags, struct fib_lookup_arg *arg)
+{
+	int err = -EAGAIN;
+	struct fib_table *tbl;
+
+	switch (rule->action) {
+	case FR_ACT_TO_TBL:
+		break;
+
+	case FR_ACT_UNREACHABLE:
+		err = -ENETUNREACH;
+		goto errout;
+
+	case FR_ACT_PROHIBIT:
+		err = -EACCES;
+		goto errout;
+
+	case FR_ACT_BLACKHOLE:
+	default:
+		err = -EINVAL;
+		goto errout;
+	}
+
+	if ((tbl = fib_get_table(rule->fr_net, rule->table)) == NULL)
+		goto errout;
+
+	err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
+	if (err > 0)
+		err = -EAGAIN;
+errout:
+	return err;
+}
+
+
+static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
+{
+	struct fib4_rule *r = (struct fib4_rule *) rule;
+	__be32 daddr = fl->fl4_dst;
+	__be32 saddr = fl->fl4_src;
+
+	if (((saddr ^ r->src) & r->srcmask) ||
+	    ((daddr ^ r->dst) & r->dstmask))
+		return 0;
+
+	if (r->tos && (r->tos != fl->fl4_tos))
+		return 0;
+
+	return 1;
+}
+
+static struct fib_table *fib_empty_table(struct net *net)
+{
+	u32 id;
+
+	for (id = 1; id <= RT_TABLE_MAX; id++)
+		if (fib_get_table(net, id) == NULL)
+			return fib_new_table(net, id);
+	return NULL;
+}
+
+static const struct nla_policy fib4_rule_policy[FRA_MAX+1] = {
+	FRA_GENERIC_POLICY,
+	[FRA_FLOW]	= { .type = NLA_U32 },
+};
+
+static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
+			       struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
+			       struct nlattr **tb)
+{
+	struct net *net = sock_net(skb->sk);
+	int err = -EINVAL;
+	struct fib4_rule *rule4 = (struct fib4_rule *) rule;
+
+	if (frh->tos & ~IPTOS_TOS_MASK)
+		goto errout;
+
+	if (rule->table == RT_TABLE_UNSPEC) {
+		if (rule->action == FR_ACT_TO_TBL) {
+			struct fib_table *table;
+
+			table = fib_empty_table(net);
+			if (table == NULL) {
+				err = -ENOBUFS;
+				goto errout;
+			}
+
+			rule->table = table->tb_id;
+		}
+	}
+
+	if (frh->src_len)
+		rule4->src = nla_get_be32(tb[FRA_SRC]);
+
+	if (frh->dst_len)
+		rule4->dst = nla_get_be32(tb[FRA_DST]);
+
+#ifdef CONFIG_NET_CLS_ROUTE
+	if (tb[FRA_FLOW])
+		rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
+#endif
+
+	rule4->src_len = frh->src_len;
+	rule4->srcmask = inet_make_mask(rule4->src_len);
+	rule4->dst_len = frh->dst_len;
+	rule4->dstmask = inet_make_mask(rule4->dst_len);
+	rule4->tos = frh->tos;
+
+	err = 0;
+errout:
+	return err;
+}
+
+static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
+			     struct nlattr **tb)
+{
+	struct fib4_rule *rule4 = (struct fib4_rule *) rule;
+
+	if (frh->src_len && (rule4->src_len != frh->src_len))
+		return 0;
+
+	if (frh->dst_len && (rule4->dst_len != frh->dst_len))
+		return 0;
+
+	if (frh->tos && (rule4->tos != frh->tos))
+		return 0;
+
+#ifdef CONFIG_NET_CLS_ROUTE
+	if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
+		return 0;
+#endif
+
+	if (frh->src_len && (rule4->src != nla_get_be32(tb[FRA_SRC])))
+		return 0;
+
+	if (frh->dst_len && (rule4->dst != nla_get_be32(tb[FRA_DST])))
+		return 0;
+
+	return 1;
+}
+
+static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
+			  struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
+{
+	struct fib4_rule *rule4 = (struct fib4_rule *) rule;
+
+	frh->family = AF_INET;
+	frh->dst_len = rule4->dst_len;
+	frh->src_len = rule4->src_len;
+	frh->tos = rule4->tos;
+
+	if (rule4->dst_len)
+		NLA_PUT_BE32(skb, FRA_DST, rule4->dst);
+
+	if (rule4->src_len)
+		NLA_PUT_BE32(skb, FRA_SRC, rule4->src);
+
+#ifdef CONFIG_NET_CLS_ROUTE
+	if (rule4->tclassid)
+		NLA_PUT_U32(skb, FRA_FLOW, rule4->tclassid);
+#endif
+	return 0;
+
+nla_put_failure:
+	return -ENOBUFS;
+}
+
+static u32 fib4_rule_default_pref(struct fib_rules_ops *ops)
+{
+	struct list_head *pos;
+	struct fib_rule *rule;
+
+	if (!list_empty(&ops->rules_list)) {
+		pos = ops->rules_list.next;
+		if (pos->next != &ops->rules_list) {
+			rule = list_entry(pos->next, struct fib_rule, list);
+			if (rule->pref)
+				return rule->pref - 1;
+		}
+	}
+
+	return 0;
+}
+
+static size_t fib4_rule_nlmsg_payload(struct fib_rule *rule)
+{
+	return nla_total_size(4) /* dst */
+	       + nla_total_size(4) /* src */
+	       + nla_total_size(4); /* flow */
+}
+
+static void fib4_rule_flush_cache(struct fib_rules_ops *ops)
+{
+	rt_cache_flush(ops->fro_net, -1);
+}
+
+static struct fib_rules_ops fib4_rules_ops_template = {
+	.family		= AF_INET,
+	.rule_size	= sizeof(struct fib4_rule),
+	.addr_size	= sizeof(u32),
+	.action		= fib4_rule_action,
+	.match		= fib4_rule_match,
+	.configure	= fib4_rule_configure,
+	.compare	= fib4_rule_compare,
+	.fill		= fib4_rule_fill,
+	.default_pref	= fib4_rule_default_pref,
+	.nlmsg_payload	= fib4_rule_nlmsg_payload,
+	.flush_cache	= fib4_rule_flush_cache,
+	.nlgroup	= RTNLGRP_IPV4_RULE,
+	.policy		= fib4_rule_policy,
+	.owner		= THIS_MODULE,
+};
+
+static int fib_default_rules_init(struct fib_rules_ops *ops)
+{
+	int err;
+
+	err = fib_default_rule_add(ops, 0, RT_TABLE_LOCAL, FIB_RULE_PERMANENT);
+	if (err < 0)
+		return err;
+	err = fib_default_rule_add(ops, 0x7FFE, RT_TABLE_MAIN, 0);
+	if (err < 0)
+		return err;
+	err = fib_default_rule_add(ops, 0x7FFF, RT_TABLE_DEFAULT, 0);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+int __net_init fib4_rules_init(struct net *net)
+{
+	int err;
+	struct fib_rules_ops *ops;
+
+	ops = kmemdup(&fib4_rules_ops_template, sizeof(*ops), GFP_KERNEL);
+	if (ops == NULL)
+		return -ENOMEM;
+	INIT_LIST_HEAD(&ops->rules_list);
+	ops->fro_net = net;
+
+	fib_rules_register(ops);
+
+	err = fib_default_rules_init(ops);
+	if (err < 0)
+		goto fail;
+	net->ipv4.rules_ops = ops;
+	return 0;
+
+fail:
+	/* also cleans all rules already added */
+	fib_rules_unregister(ops);
+	kfree(ops);
+	return err;
+}
+
+void __net_exit fib4_rules_exit(struct net *net)
+{
+	fib_rules_unregister(net->ipv4.rules_ops);
+	kfree(net->ipv4.rules_ops);
+}