Initial import

1 files changed, 243 insertions, 0 deletions

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
new file mode 100644
index 000000000..59649d588
--- /dev/null
+++ b/net/sched/act_pedit.c
@@ -0,0 +1,243 @@
+/*
+ * net/sched/act_pedit.c	Generic packet editor
+ *
+ *		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.
+ *
+ * Authors:	Jamal Hadi Salim (2002-4)
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_pedit.h>
+
+#define PEDIT_TAB_MASK	15
+
+static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
+	[TCA_PEDIT_PARMS]	= { .len = sizeof(struct tc_pedit) },
+};
+
+static int tcf_pedit_init(struct net *net, struct nlattr *nla,
+			  struct nlattr *est, struct tc_action *a,
+			  int ovr, int bind)
+{
+	struct nlattr *tb[TCA_PEDIT_MAX + 1];
+	struct tc_pedit *parm;
+	int ret = 0, err;
+	struct tcf_pedit *p;
+	struct tc_pedit_key *keys = NULL;
+	int ksize;
+
+	if (nla == NULL)
+		return -EINVAL;
+
+	err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy);
+	if (err < 0)
+		return err;
+
+	if (tb[TCA_PEDIT_PARMS] == NULL)
+		return -EINVAL;
+	parm = nla_data(tb[TCA_PEDIT_PARMS]);
+	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
+	if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize)
+		return -EINVAL;
+
+	if (!tcf_hash_check(parm->index, a, bind)) {
+		if (!parm->nkeys)
+			return -EINVAL;
+		ret = tcf_hash_create(parm->index, est, a, sizeof(*p), bind);
+		if (ret)
+			return ret;
+		p = to_pedit(a);
+		keys = kmalloc(ksize, GFP_KERNEL);
+		if (keys == NULL) {
+			tcf_hash_cleanup(a, est);
+			return -ENOMEM;
+		}
+		ret = ACT_P_CREATED;
+	} else {
+		p = to_pedit(a);
+		tcf_hash_release(a, bind);
+		if (bind)
+			return 0;
+		if (!ovr)
+			return -EEXIST;
+
+		if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
+			keys = kmalloc(ksize, GFP_KERNEL);
+			if (keys == NULL)
+				return -ENOMEM;
+		}
+	}
+
+	spin_lock_bh(&p->tcf_lock);
+	p->tcfp_flags = parm->flags;
+	p->tcf_action = parm->action;
+	if (keys) {
+		kfree(p->tcfp_keys);
+		p->tcfp_keys = keys;
+		p->tcfp_nkeys = parm->nkeys;
+	}
+	memcpy(p->tcfp_keys, parm->keys, ksize);
+	spin_unlock_bh(&p->tcf_lock);
+	if (ret == ACT_P_CREATED)
+		tcf_hash_insert(a);
+	return ret;
+}
+
+static void tcf_pedit_cleanup(struct tc_action *a, int bind)
+{
+	struct tcf_pedit *p = a->priv;
+	struct tc_pedit_key *keys = p->tcfp_keys;
+	kfree(keys);
+}
+
+static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
+		     struct tcf_result *res)
+{
+	struct tcf_pedit *p = a->priv;
+	int i, munged = 0;
+	unsigned int off;
+
+	if (skb_unclone(skb, GFP_ATOMIC))
+		return p->tcf_action;
+
+	off = skb_network_offset(skb);
+
+	spin_lock(&p->tcf_lock);
+
+	p->tcf_tm.lastuse = jiffies;
+
+	if (p->tcfp_nkeys > 0) {
+		struct tc_pedit_key *tkey = p->tcfp_keys;
+
+		for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
+			u32 *ptr, _data;
+			int offset = tkey->off;
+
+			if (tkey->offmask) {
+				char *d, _d;
+
+				d = skb_header_pointer(skb, off + tkey->at, 1,
+						       &_d);
+				if (!d)
+					goto bad;
+				offset += (*d & tkey->offmask) >> tkey->shift;
+			}
+
+			if (offset % 4) {
+				pr_info("tc filter pedit"
+					" offset must be on 32 bit boundaries\n");
+				goto bad;
+			}
+			if (offset > 0 && offset > skb->len) {
+				pr_info("tc filter pedit"
+					" offset %d can't exceed pkt length %d\n",
+				       offset, skb->len);
+				goto bad;
+			}
+
+			ptr = skb_header_pointer(skb, off + offset, 4, &_data);
+			if (!ptr)
+				goto bad;
+			/* just do it, baby */
+			*ptr = ((*ptr & tkey->mask) ^ tkey->val);
+			if (ptr == &_data)
+				skb_store_bits(skb, off + offset, ptr, 4);
+			munged++;
+		}
+
+		if (munged)
+			skb->tc_verd = SET_TC_MUNGED(skb->tc_verd);
+		goto done;
+	} else
+		WARN(1, "pedit BUG: index %d\n", p->tcf_index);
+
+bad:
+	p->tcf_qstats.overlimits++;
+done:
+	bstats_update(&p->tcf_bstats, skb);
+	spin_unlock(&p->tcf_lock);
+	return p->tcf_action;
+}
+
+static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
+			  int bind, int ref)
+{
+	unsigned char *b = skb_tail_pointer(skb);
+	struct tcf_pedit *p = a->priv;
+	struct tc_pedit *opt;
+	struct tcf_t t;
+	int s;
+
+	s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
+
+	/* netlink spinlocks held above us - must use ATOMIC */
+	opt = kzalloc(s, GFP_ATOMIC);
+	if (unlikely(!opt))
+		return -ENOBUFS;
+
+	memcpy(opt->keys, p->tcfp_keys,
+	       p->tcfp_nkeys * sizeof(struct tc_pedit_key));
+	opt->index = p->tcf_index;
+	opt->nkeys = p->tcfp_nkeys;
+	opt->flags = p->tcfp_flags;
+	opt->action = p->tcf_action;
+	opt->refcnt = p->tcf_refcnt - ref;
+	opt->bindcnt = p->tcf_bindcnt - bind;
+
+	if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
+		goto nla_put_failure;
+	t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
+	t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
+	t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
+	if (nla_put(skb, TCA_PEDIT_TM, sizeof(t), &t))
+		goto nla_put_failure;
+	kfree(opt);
+	return skb->len;
+
+nla_put_failure:
+	nlmsg_trim(skb, b);
+	kfree(opt);
+	return -1;
+}
+
+static struct tc_action_ops act_pedit_ops = {
+	.kind		=	"pedit",
+	.type		=	TCA_ACT_PEDIT,
+	.owner		=	THIS_MODULE,
+	.act		=	tcf_pedit,
+	.dump		=	tcf_pedit_dump,
+	.cleanup	=	tcf_pedit_cleanup,
+	.init		=	tcf_pedit_init,
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
+MODULE_DESCRIPTION("Generic Packet Editor actions");
+MODULE_LICENSE("GPL");
+
+static int __init pedit_init_module(void)
+{
+	return tcf_register_action(&act_pedit_ops, PEDIT_TAB_MASK);
+}
+
+static void __exit pedit_cleanup_module(void)
+{
+	tcf_unregister_action(&act_pedit_ops);
+}
+
+module_init(pedit_init_module);
+module_exit(pedit_cleanup_module);
+