[linux-2.6-block.git] / net / sched / act_pedit.c

/*
 * 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>
#include <uapi/linux/tc_act/tc_pedit.h>
#include <net/pkt_cls.h>

static unsigned int pedit_net_id;
static struct tc_action_ops act_pedit_ops;

static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
	[TCA_PEDIT_PARMS]	= { .len = sizeof(struct tc_pedit) },
	[TCA_PEDIT_KEYS_EX]   = { .type = NLA_NESTED },
};

static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
	[TCA_PEDIT_KEY_EX_HTYPE]  = { .type = NLA_U16 },
	[TCA_PEDIT_KEY_EX_CMD]	  = { .type = NLA_U16 },
};

static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
							u8 n)
{
	struct tcf_pedit_key_ex *keys_ex;
	struct tcf_pedit_key_ex *k;
	const struct nlattr *ka;
	int err = -EINVAL;
	int rem;

	if (!nla || !n)
		return NULL;

	keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
	if (!keys_ex)
		return ERR_PTR(-ENOMEM);

	k = keys_ex;

	nla_for_each_nested(ka, nla, rem) {
		struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];

		if (!n) {
			err = -EINVAL;
			goto err_out;
		}
		n--;

		if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
			err = -EINVAL;
			goto err_out;
		}

		err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
						  ka, pedit_key_ex_policy,
						  NULL);
		if (err)
			goto err_out;

		if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
		    !tb[TCA_PEDIT_KEY_EX_CMD]) {
			err = -EINVAL;
			goto err_out;
		}

		k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
		k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);

		if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
		    k->cmd > TCA_PEDIT_CMD_MAX) {
			err = -EINVAL;
			goto err_out;
		}

		k++;
	}

	if (n) {
		err = -EINVAL;
		goto err_out;
	}

	return keys_ex;

err_out:
	kfree(keys_ex);
	return ERR_PTR(err);
}

static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
				 struct tcf_pedit_key_ex *keys_ex, int n)
{
	struct nlattr *keys_start = nla_nest_start_noflag(skb,
							  TCA_PEDIT_KEYS_EX);

	if (!keys_start)
		goto nla_failure;
	for (; n > 0; n--) {
		struct nlattr *key_start;

		key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
		if (!key_start)
			goto nla_failure;

		if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) ||
		    nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
			goto nla_failure;

		nla_nest_end(skb, key_start);

		keys_ex++;
	}

	nla_nest_end(skb, keys_start);

	return 0;
nla_failure:
	nla_nest_cancel(skb, keys_start);
	return -EINVAL;
}

static int tcf_pedit_init(struct net *net, struct nlattr *nla,
			  struct nlattr *est, struct tc_action **a,
			  int ovr, int bind, bool rtnl_held,
			  struct tcf_proto *tp, struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	struct nlattr *tb[TCA_PEDIT_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tc_pedit_key *keys = NULL;
	struct tcf_pedit_key_ex *keys_ex;
	struct tc_pedit *parm;
	struct nlattr *pattr;
	struct tcf_pedit *p;
	int ret = 0, err;
	int ksize;

	if (!nla) {
		NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
		return -EINVAL;
	}

	err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
					  pedit_policy, NULL);
	if (err < 0)
		return err;

	pattr = tb[TCA_PEDIT_PARMS];
	if (!pattr)
		pattr = tb[TCA_PEDIT_PARMS_EX];
	if (!pattr) {
		NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
		return -EINVAL;
	}

	parm = nla_data(pattr);
	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
	if (nla_len(pattr) < sizeof(*parm) + ksize) {
		NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
		return -EINVAL;
	}

	keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
	if (IS_ERR(keys_ex))
		return PTR_ERR(keys_ex);

	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
	if (!err) {
		if (!parm->nkeys) {
			tcf_idr_cleanup(tn, parm->index);
			NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
			ret = -EINVAL;
			goto out_free;
		}
		ret = tcf_idr_create(tn, parm->index, est, a,
				     &act_pedit_ops, bind, false);
		if (ret) {
			tcf_idr_cleanup(tn, parm->index);
			goto out_free;
		}
		ret = ACT_P_CREATED;
	} else if (err > 0) {
		if (bind)
			goto out_free;
		if (!ovr) {
			ret = -EEXIST;
			goto out_release;
		}
	} else {
		ret = err;
		goto out_free;
	}

	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0) {
		ret = err;
		goto out_release;
	}
	p = to_pedit(*a);
	spin_lock_bh(&p->tcf_lock);

	if (ret == ACT_P_CREATED ||
	    (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
		keys = kmalloc(ksize, GFP_ATOMIC);
		if (!keys) {
			spin_unlock_bh(&p->tcf_lock);
			ret = -ENOMEM;
			goto put_chain;
		}
		kfree(p->tcfp_keys);
		p->tcfp_keys = keys;
		p->tcfp_nkeys = parm->nkeys;
	}
	memcpy(p->tcfp_keys, parm->keys, ksize);

	p->tcfp_flags = parm->flags;
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);

	kfree(p->tcfp_keys_ex);
	p->tcfp_keys_ex = keys_ex;

	spin_unlock_bh(&p->tcf_lock);
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);
	return ret;

put_chain:
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
out_release:
	tcf_idr_release(*a, bind);
out_free:
	kfree(keys_ex);
	return ret;

}

static void tcf_pedit_cleanup(struct tc_action *a)
{
	struct tcf_pedit *p = to_pedit(a);
	struct tc_pedit_key *keys = p->tcfp_keys;

	kfree(keys);
	kfree(p->tcfp_keys_ex);
}

static bool offset_valid(struct sk_buff *skb, int offset)
{
	if (offset > 0 && offset > skb->len)
		return false;

	if  (offset < 0 && -offset > skb_headroom(skb))
		return false;

	return true;
}

static int pedit_skb_hdr_offset(struct sk_buff *skb,
				enum pedit_header_type htype, int *hoffset)
{
	int ret = -EINVAL;

	switch (htype) {
	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
		if (skb_mac_header_was_set(skb)) {
			*hoffset = skb_mac_offset(skb);
			ret = 0;
		}
		break;
	case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
		*hoffset = skb_network_offset(skb);
		ret = 0;
		break;
	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
		if (skb_transport_header_was_set(skb)) {
			*hoffset = skb_transport_offset(skb);
			ret = 0;
		}
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a,
			 struct tcf_result *res)
{
	struct tcf_pedit *p = to_pedit(a);
	int i;

	if (skb_unclone(skb, GFP_ATOMIC))
		return p->tcf_action;

	spin_lock(&p->tcf_lock);

	tcf_lastuse_update(&p->tcf_tm);

	if (p->tcfp_nkeys > 0) {
		struct tc_pedit_key *tkey = p->tcfp_keys;
		struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
		enum pedit_header_type htype =
			TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
		enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;

		for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
			u32 *ptr, hdata;
			int offset = tkey->off;
			int hoffset;
			u32 val;
			int rc;

			if (tkey_ex) {
				htype = tkey_ex->htype;
				cmd = tkey_ex->cmd;

				tkey_ex++;
			}

			rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
			if (rc) {
				pr_info("tc action pedit bad header type specified (0x%x)\n",
					htype);
				goto bad;
			}

			if (tkey->offmask) {
				u8 *d, _d;

				if (!offset_valid(skb, hoffset + tkey->at)) {
					pr_info("tc action pedit 'at' offset %d out of bounds\n",
						hoffset + tkey->at);
					goto bad;
				}
				d = skb_header_pointer(skb, hoffset + tkey->at,
						       sizeof(_d), &_d);
				if (!d)
					goto bad;
				offset += (*d & tkey->offmask) >> tkey->shift;
			}

			if (offset % 4) {
				pr_info("tc action pedit offset must be on 32 bit boundaries\n");
				goto bad;
			}

			if (!offset_valid(skb, hoffset + offset)) {
				pr_info("tc action pedit offset %d out of bounds\n",
					hoffset + offset);
				goto bad;
			}

			ptr = skb_header_pointer(skb, hoffset + offset,
						 sizeof(hdata), &hdata);
			if (!ptr)
				goto bad;
			/* just do it, baby */
			switch (cmd) {
			case TCA_PEDIT_KEY_EX_CMD_SET:
				val = tkey->val;
				break;
			case TCA_PEDIT_KEY_EX_CMD_ADD:
				val = (*ptr + tkey->val) & ~tkey->mask;
				break;
			default:
				pr_info("tc action pedit bad command (%d)\n",
					cmd);
				goto bad;
			}

			*ptr = ((*ptr & tkey->mask) ^ val);
			if (ptr == &hdata)
				skb_store_bits(skb, hoffset + offset, ptr, 4);
		}

		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 = to_pedit(a);
	struct tc_pedit *opt;
	struct tcf_t t;
	int s;

	s = struct_size(opt, keys, p->tcfp_nkeys);

	/* netlink spinlocks held above us - must use ATOMIC */
	opt = kzalloc(s, GFP_ATOMIC);
	if (unlikely(!opt))
		return -ENOBUFS;

	spin_lock_bh(&p->tcf_lock);
	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 = refcount_read(&p->tcf_refcnt) - ref;
	opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;

	if (p->tcfp_keys_ex) {
		if (tcf_pedit_key_ex_dump(skb,
					  p->tcfp_keys_ex,
					  p->tcfp_nkeys))
			goto nla_put_failure;

		if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
			goto nla_put_failure;
	} else {
		if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
			goto nla_put_failure;
	}

	tcf_tm_dump(&t, &p->tcf_tm);
	if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&p->tcf_lock);

	kfree(opt);
	return skb->len;

nla_put_failure:
	spin_unlock_bh(&p->tcf_lock);
	nlmsg_trim(skb, b);
	kfree(opt);
	return -1;
}

static int tcf_pedit_walker(struct net *net, struct sk_buff *skb,
			    struct netlink_callback *cb, int type,
			    const struct tc_action_ops *ops,
			    struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, pedit_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, pedit_net_id);

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_pedit_ops = {
	.kind		=	"pedit",
	.id		=	TCA_ID_PEDIT,
	.owner		=	THIS_MODULE,
	.act		=	tcf_pedit_act,
	.dump		=	tcf_pedit_dump,
	.cleanup	=	tcf_pedit_cleanup,
	.init		=	tcf_pedit_init,
	.walk		=	tcf_pedit_walker,
	.lookup		=	tcf_pedit_search,
	.size		=	sizeof(struct tcf_pedit),
};

static __net_init int pedit_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, pedit_net_id);

	return tc_action_net_init(tn, &act_pedit_ops);
}

static void __net_exit pedit_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, pedit_net_id);
}

static struct pernet_operations pedit_net_ops = {
	.init = pedit_init_net,
	.exit_batch = pedit_exit_net,
	.id   = &pedit_net_id,
	.size = sizeof(struct tc_action_net),
};

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_net_ops);
}

static void __exit pedit_cleanup_module(void)
{
	tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
}

module_init(pedit_init_module);
module_exit(pedit_cleanup_module);
Commit	Line	Data
1da177e4	1	/*
0c6965dd	2	* net/sched/act_pedit.c Generic packet editor
1da177e4 LT	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Jamal Hadi Salim (2002-4)
	10	*/
	11
1da177e4 LT	12	#include <linux/types.h>
1da177e4 LT	13	#include <linux/kernel.h>
1da177e4	14	#include <linux/string.h>
1da177e4	15	#include <linux/errno.h>
1da177e4 LT	16	#include <linux/skbuff.h>
	17	#include <linux/rtnetlink.h>
	18	#include <linux/module.h>
	19	#include <linux/init.h>
5a0e3ad6	20	#include <linux/slab.h>
dc5fc579	21	#include <net/netlink.h>
1da177e4 LT	22	#include <net/pkt_sched.h>
	23	#include <linux/tc_act/tc_pedit.h>
	24	#include <net/tc_act/tc_pedit.h>
71d0ed70	25	#include <uapi/linux/tc_act/tc_pedit.h>
6ac86ca3	26	#include <net/pkt_cls.h>
1da177e4	27
c7d03a00	28	static unsigned int pedit_net_id;
a85a970a	29	static struct tc_action_ops act_pedit_ops;
ddf97ccd	30
53b2bf3f	31	static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
53f7e35f	32	[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
71d0ed70	33	[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
53b2bf3f PM	34	};
53b2bf3f PM	35
71d0ed70 AV	36	static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
71d0ed70 AV	37	[TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
853a14ba	38	[TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
71d0ed70 AV	39	};
	40
	41	static struct tcf_pedit_key_ex tcf_pedit_keys_ex_parse(struct nlattr nla,
	42	u8 n)
	43	{
	44	struct tcf_pedit_key_ex *keys_ex;
	45	struct tcf_pedit_key_ex *k;
	46	const struct nlattr *ka;
	47	int err = -EINVAL;
	48	int rem;
	49
	50	if (!nla \|\| !n)
	51	return NULL;
	52
	53	keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
	54	if (!keys_ex)
	55	return ERR_PTR(-ENOMEM);
	56
	57	k = keys_ex;
	58
	59	nla_for_each_nested(ka, nla, rem) {
	60	struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
	61
	62	if (!n) {
	63	err = -EINVAL;
	64	goto err_out;
	65	}
	66	n--;
	67
	68	if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
	69	err = -EINVAL;
	70	goto err_out;
	71	}
	72
8cb08174 JB	73	err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
	74	ka, pedit_key_ex_policy,
	75	NULL);
71d0ed70 AV	76	if (err)
	77	goto err_out;
	78
853a14ba AV	79	if (!tb[TCA_PEDIT_KEY_EX_HTYPE] \|\|
853a14ba AV	80	!tb[TCA_PEDIT_KEY_EX_CMD]) {
71d0ed70 AV	81	err = -EINVAL;
	82	goto err_out;
	83	}
	84
	85	k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
853a14ba	86	k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
71d0ed70	87
853a14ba AV	88	if (k->htype > TCA_PEDIT_HDR_TYPE_MAX \|\|
853a14ba AV	89	k->cmd > TCA_PEDIT_CMD_MAX) {
71d0ed70 AV	90	err = -EINVAL;
	91	goto err_out;
	92	}
	93
	94	k++;
	95	}
	96
c4f65b09 DC	97	if (n) {
c4f65b09 DC	98	err = -EINVAL;
71d0ed70	99	goto err_out;
c4f65b09	100	}
71d0ed70 AV	101
	102	return keys_ex;
	103
	104	err_out:
	105	kfree(keys_ex);
	106	return ERR_PTR(err);
	107	}
	108
	109	static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
	110	struct tcf_pedit_key_ex *keys_ex, int n)
	111	{
ae0be8de MK	112	struct nlattr *keys_start = nla_nest_start_noflag(skb,
ae0be8de MK	113	TCA_PEDIT_KEYS_EX);
71d0ed70	114
85eb9af1 DC	115	if (!keys_start)
85eb9af1 DC	116	goto nla_failure;
71d0ed70 AV	117	for (; n > 0; n--) {
	118	struct nlattr *key_start;
	119
ae0be8de	120	key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX);
85eb9af1 DC	121	if (!key_start)
85eb9af1 DC	122	goto nla_failure;
71d0ed70	123
853a14ba	124	if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) \|\|
85eb9af1 DC	125	nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
85eb9af1 DC	126	goto nla_failure;
71d0ed70 AV	127
	128	nla_nest_end(skb, key_start);
	129
	130	keys_ex++;
	131	}
	132
	133	nla_nest_end(skb, keys_start);
	134
	135	return 0;
85eb9af1 DC	136	nla_failure:
	137	nla_nest_cancel(skb, keys_start);
	138	return -EINVAL;
71d0ed70 AV	139	}
71d0ed70 AV	140
c1b52739	141	static int tcf_pedit_init(struct net net, struct nlattr nla,
a85a970a	142	struct nlattr est, struct tc_action *a,
789871bb	143	int ovr, int bind, bool rtnl_held,
85d0966f	144	struct tcf_proto tp, struct netlink_ext_ack extack)
1da177e4	145	{
ddf97ccd	146	struct tc_action_net *tn = net_generic(net, pedit_net_id);
7ba699c6	147	struct nlattr *tb[TCA_PEDIT_MAX + 1];
6ac86ca3	148	struct tcf_chain *goto_ch = NULL;
1da177e4	149	struct tc_pedit_key *keys = NULL;
71d0ed70	150	struct tcf_pedit_key_ex *keys_ex;
80f0f574 RM	151	struct tc_pedit *parm;
	152	struct nlattr *pattr;
	153	struct tcf_pedit *p;
	154	int ret = 0, err;
1da177e4 LT	155	int ksize;
1da177e4 LT	156
9868c0b2 RM	157	if (!nla) {
9868c0b2 RM	158	NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
1da177e4	159	return -EINVAL;
9868c0b2	160	}
1da177e4	161
8cb08174 JB	162	err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla,
8cb08174 JB	163	pedit_policy, NULL);
cee63723 PM	164	if (err < 0)
	165	return err;
	166
71d0ed70 AV	167	pattr = tb[TCA_PEDIT_PARMS];
	168	if (!pattr)
	169	pattr = tb[TCA_PEDIT_PARMS_EX];
9868c0b2 RM	170	if (!pattr) {
9868c0b2 RM	171	NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
1da177e4	172	return -EINVAL;
9868c0b2	173	}
71d0ed70 AV	174
71d0ed70 AV	175	parm = nla_data(pattr);
1da177e4	176	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
9868c0b2 RM	177	if (nla_len(pattr) < sizeof(*parm) + ksize) {
9868c0b2 RM	178	NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
1da177e4	179	return -EINVAL;
9868c0b2	180	}
1da177e4	181
71d0ed70 AV	182	keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
	183	if (IS_ERR(keys_ex))
	184	return PTR_ERR(keys_ex);
	185
0190c1d4 VB	186	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
0190c1d4 VB	187	if (!err) {
9868c0b2	188	if (!parm->nkeys) {
0190c1d4	189	tcf_idr_cleanup(tn, parm->index);
9868c0b2	190	NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
30e99ed6 WY	191	ret = -EINVAL;
30e99ed6 WY	192	goto out_free;
9868c0b2	193	}
65a206c0 CM	194	ret = tcf_idr_create(tn, parm->index, est, a,
65a206c0 CM	195	&act_pedit_ops, bind, false);
0190c1d4 VB	196	if (ret) {
0190c1d4 VB	197	tcf_idr_cleanup(tn, parm->index);
30e99ed6	198	goto out_free;
0190c1d4	199	}
1da177e4	200	ret = ACT_P_CREATED;
0190c1d4	201	} else if (err > 0) {
1a29321e	202	if (bind)
30e99ed6	203	goto out_free;
30e99ed6 WY	204	if (!ovr) {
30e99ed6 WY	205	ret = -EEXIST;
67b0c1a3	206	goto out_release;
1da177e4	207	}
0190c1d4	208	} else {
19ab6910 DC	209	ret = err;
19ab6910 DC	210	goto out_free;
1da177e4 LT	211	}
1da177e4 LT	212
6ac86ca3 DC	213	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	214	if (err < 0) {
	215	ret = err;
	216	goto out_release;
	217	}
67b0c1a3	218	p = to_pedit(*a);
e9ce1cd3	219	spin_lock_bh(&p->tcf_lock);
67b0c1a3 VB	220
	221	if (ret == ACT_P_CREATED \|\|
	222	(p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
	223	keys = kmalloc(ksize, GFP_ATOMIC);
	224	if (!keys) {
	225	spin_unlock_bh(&p->tcf_lock);
	226	ret = -ENOMEM;
6ac86ca3	227	goto put_chain;
67b0c1a3	228	}
e9ce1cd3 DM	229	kfree(p->tcfp_keys);
	230	p->tcfp_keys = keys;
	231	p->tcfp_nkeys = parm->nkeys;
1da177e4	232	}
e9ce1cd3	233	memcpy(p->tcfp_keys, parm->keys, ksize);
71d0ed70	234
67b0c1a3	235	p->tcfp_flags = parm->flags;
6ac86ca3	236	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
67b0c1a3	237
71d0ed70 AV	238	kfree(p->tcfp_keys_ex);
	239	p->tcfp_keys_ex = keys_ex;
	240
e9ce1cd3	241	spin_unlock_bh(&p->tcf_lock);
6ac86ca3 DC	242	if (goto_ch)
6ac86ca3 DC	243	tcf_chain_put_by_act(goto_ch);
1da177e4	244	if (ret == ACT_P_CREATED)
65a206c0	245	tcf_idr_insert(tn, *a);
1da177e4	246	return ret;
67b0c1a3	247
6ac86ca3 DC	248	put_chain:
	249	if (goto_ch)
	250	tcf_chain_put_by_act(goto_ch);
67b0c1a3 VB	251	out_release:
67b0c1a3 VB	252	tcf_idr_release(*a, bind);
30e99ed6 WY	253	out_free:
	254	kfree(keys_ex);
	255	return ret;
	256
1da177e4 LT	257	}
1da177e4 LT	258
9a63b255	259	static void tcf_pedit_cleanup(struct tc_action *a)
1da177e4	260	{
a85a970a	261	struct tcf_pedit *p = to_pedit(a);
a5b5c958	262	struct tc_pedit_key *keys = p->tcfp_keys;
80f0f574	263
a5b5c958	264	kfree(keys);
71d0ed70	265	kfree(p->tcfp_keys_ex);
1da177e4 LT	266	}
1da177e4 LT	267
95c2027b AV	268	static bool offset_valid(struct sk_buff *skb, int offset)
	269	{
	270	if (offset > 0 && offset > skb->len)
	271	return false;
	272
	273	if (offset < 0 && -offset > skb_headroom(skb))
	274	return false;
	275
	276	return true;
	277	}
	278
71d0ed70 AV	279	static int pedit_skb_hdr_offset(struct sk_buff *skb,
	280	enum pedit_header_type htype, int *hoffset)
	281	{
	282	int ret = -EINVAL;
	283
	284	switch (htype) {
	285	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
	286	if (skb_mac_header_was_set(skb)) {
	287	*hoffset = skb_mac_offset(skb);
	288	ret = 0;
	289	}
	290	break;
	291	case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
	292	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
	293	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
	294	*hoffset = skb_network_offset(skb);
	295	ret = 0;
	296	break;
	297	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
	298	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
	299	if (skb_transport_header_was_set(skb)) {
	300	*hoffset = skb_transport_offset(skb);
	301	ret = 0;
	302	}
	303	break;
	304	default:
	305	ret = -EINVAL;
	306	break;
0a80848e	307	}
71d0ed70 AV	308
	309	return ret;
	310	}
	311
6a2b401c JHS	312	static int tcf_pedit_act(struct sk_buff skb, const struct tc_action a,
6a2b401c JHS	313	struct tcf_result *res)
1da177e4	314	{
a85a970a	315	struct tcf_pedit *p = to_pedit(a);
4749c3ef	316	int i;
1da177e4	317
14bbd6a5	318	if (skb_unclone(skb, GFP_ATOMIC))
cc7ec456	319	return p->tcf_action;
1da177e4	320
e9ce1cd3	321	spin_lock(&p->tcf_lock);
1da177e4	322
9c4a4e48	323	tcf_lastuse_update(&p->tcf_tm);
1da177e4	324
e9ce1cd3 DM	325	if (p->tcfp_nkeys > 0) {
e9ce1cd3 DM	326	struct tc_pedit_key *tkey = p->tcfp_keys;
71d0ed70	327	struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
80f0f574 RM	328	enum pedit_header_type htype =
80f0f574 RM	329	TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
853a14ba	330	enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
1da177e4	331
e9ce1cd3	332	for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
544377cd	333	u32 *ptr, hdata;
1da177e4	334	int offset = tkey->off;
71d0ed70	335	int hoffset;
853a14ba	336	u32 val;
71d0ed70 AV	337	int rc;
	338
	339	if (tkey_ex) {
	340	htype = tkey_ex->htype;
853a14ba AV	341	cmd = tkey_ex->cmd;
853a14ba AV	342
71d0ed70 AV	343	tkey_ex++;
	344	}
	345
	346	rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
	347	if (rc) {
95b0d2dc	348	pr_info("tc action pedit bad header type specified (0x%x)\n",
71d0ed70 AV	349	htype);
	350	goto bad;
	351	}
1da177e4 LT	352
1da177e4 LT	353	if (tkey->offmask) {
43052741	354	u8 *d, _d;
db2c2417	355
71d0ed70	356	if (!offset_valid(skb, hoffset + tkey->at)) {
95b0d2dc	357	pr_info("tc action pedit 'at' offset %d out of bounds\n",
71d0ed70	358	hoffset + tkey->at);
95c2027b AV	359	goto bad;
95c2027b AV	360	}
80f0f574	361	d = skb_header_pointer(skb, hoffset + tkey->at,
6ff7586e	362	sizeof(_d), &_d);
db2c2417	363	if (!d)
1da177e4	364	goto bad;
db2c2417	365	offset += (*d & tkey->offmask) >> tkey->shift;
1da177e4 LT	366	}
	367
	368	if (offset % 4) {
95b0d2dc	369	pr_info("tc action pedit offset must be on 32 bit boundaries\n");
1da177e4 LT	370	goto bad;
1da177e4 LT	371	}
95c2027b	372
71d0ed70	373	if (!offset_valid(skb, hoffset + offset)) {
95b0d2dc	374	pr_info("tc action pedit offset %d out of bounds\n",
71d0ed70	375	hoffset + offset);
1da177e4 LT	376	goto bad;
	377	}
	378
80f0f574	379	ptr = skb_header_pointer(skb, hoffset + offset,
6ff7586e	380	sizeof(hdata), &hdata);
db2c2417 CG	381	if (!ptr)
db2c2417 CG	382	goto bad;
1da177e4	383	/* just do it, baby */
853a14ba AV	384	switch (cmd) {
	385	case TCA_PEDIT_KEY_EX_CMD_SET:
	386	val = tkey->val;
	387	break;
	388	case TCA_PEDIT_KEY_EX_CMD_ADD:
	389	val = (*ptr + tkey->val) & ~tkey->mask;
	390	break;
	391	default:
95b0d2dc	392	pr_info("tc action pedit bad command (%d)\n",
853a14ba AV	393	cmd);
	394	goto bad;
	395	}
	396
	397	ptr = ((ptr & tkey->mask) ^ val);
544377cd	398	if (ptr == &hdata)
71d0ed70	399	skb_store_bits(skb, hoffset + offset, ptr, 4);
1da177e4	400	}
10297b99	401
1da177e4	402	goto done;
80f0f574	403	} else {
6ff9c364	404	WARN(1, "pedit BUG: index %d\n", p->tcf_index);
80f0f574	405	}
1da177e4 LT	406
1da177e4 LT	407	bad:
e9ce1cd3	408	p->tcf_qstats.overlimits++;
1da177e4	409	done:
bfe0d029	410	bstats_update(&p->tcf_bstats, skb);
e9ce1cd3 DM	411	spin_unlock(&p->tcf_lock);
e9ce1cd3 DM	412	return p->tcf_action;
1da177e4 LT	413	}
1da177e4 LT	414
e9ce1cd3 DM	415	static int tcf_pedit_dump(struct sk_buff skb, struct tc_action a,
e9ce1cd3 DM	416	int bind, int ref)
1da177e4	417	{
27a884dc	418	unsigned char *b = skb_tail_pointer(skb);
a85a970a	419	struct tcf_pedit *p = to_pedit(a);
1da177e4	420	struct tc_pedit *opt;
1da177e4	421	struct tcf_t t;
10297b99 YH	422	int s;
10297b99 YH	423
8fe5756c	424	s = struct_size(opt, keys, p->tcfp_nkeys);
1da177e4 LT	425
1da177e4 LT	426	/* netlink spinlocks held above us - must use ATOMIC */
0da974f4	427	opt = kzalloc(s, GFP_ATOMIC);
e9ce1cd3	428	if (unlikely(!opt))
1da177e4	429	return -ENOBUFS;
1da177e4	430
67b0c1a3	431	spin_lock_bh(&p->tcf_lock);
e9ce1cd3 DM	432	memcpy(opt->keys, p->tcfp_keys,
	433	p->tcfp_nkeys * sizeof(struct tc_pedit_key));
	434	opt->index = p->tcf_index;
	435	opt->nkeys = p->tcfp_nkeys;
	436	opt->flags = p->tcfp_flags;
	437	opt->action = p->tcf_action;
036bb443 VB	438	opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
036bb443 VB	439	opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
1da177e4	440
71d0ed70	441	if (p->tcfp_keys_ex) {
85eb9af1 DC	442	if (tcf_pedit_key_ex_dump(skb,
	443	p->tcfp_keys_ex,
	444	p->tcfp_nkeys))
	445	goto nla_put_failure;
71d0ed70 AV	446
	447	if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
	448	goto nla_put_failure;
	449	} else {
	450	if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
	451	goto nla_put_failure;
	452	}
48d8ee16 JHS	453
48d8ee16 JHS	454	tcf_tm_dump(&t, &p->tcf_tm);
9854518e	455	if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
1b34ec43	456	goto nla_put_failure;
67b0c1a3	457	spin_unlock_bh(&p->tcf_lock);
48d8ee16	458
541673c8	459	kfree(opt);
1da177e4 LT	460	return skb->len;
1da177e4 LT	461
7ba699c6	462	nla_put_failure:
67b0c1a3	463	spin_unlock_bh(&p->tcf_lock);
dc5fc579	464	nlmsg_trim(skb, b);
541673c8	465	kfree(opt);
1da177e4 LT	466	return -1;
	467	}
	468
ddf97ccd WC	469	static int tcf_pedit_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	470	struct netlink_callback *cb, int type,
41780105 AA	471	const struct tc_action_ops *ops,
41780105 AA	472	struct netlink_ext_ack *extack)
ddf97ccd WC	473	{
	474	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	475
b3620145	476	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	477	}
ddf97ccd WC	478
f061b48c	479	static int tcf_pedit_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	480	{
	481	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	482
65a206c0	483	return tcf_idr_search(tn, a, index);
ddf97ccd WC	484	}
ddf97ccd WC	485
e9ce1cd3	486	static struct tc_action_ops act_pedit_ops = {
1da177e4	487	.kind = "pedit",
eddd2cf1	488	.id = TCA_ID_PEDIT,
1da177e4	489	.owner = THIS_MODULE,
6a2b401c	490	.act = tcf_pedit_act,
1da177e4 LT	491	.dump = tcf_pedit_dump,
1da177e4 LT	492	.cleanup = tcf_pedit_cleanup,
1da177e4	493	.init = tcf_pedit_init,
ddf97ccd WC	494	.walk = tcf_pedit_walker,
ddf97ccd WC	495	.lookup = tcf_pedit_search,
a85a970a	496	.size = sizeof(struct tcf_pedit),
ddf97ccd WC	497	};
	498
	499	static __net_init int pedit_init_net(struct net *net)
	500	{
	501	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	502
c7e460ce	503	return tc_action_net_init(tn, &act_pedit_ops);
ddf97ccd WC	504	}
ddf97ccd WC	505
039af9c6	506	static void __net_exit pedit_exit_net(struct list_head *net_list)
ddf97ccd	507	{
039af9c6	508	tc_action_net_exit(net_list, pedit_net_id);
ddf97ccd WC	509	}
	510
	511	static struct pernet_operations pedit_net_ops = {
	512	.init = pedit_init_net,
039af9c6	513	.exit_batch = pedit_exit_net,
ddf97ccd WC	514	.id = &pedit_net_id,
ddf97ccd WC	515	.size = sizeof(struct tc_action_net),
1da177e4 LT	516	};
	517
	518	MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
	519	MODULE_DESCRIPTION("Generic Packet Editor actions");
	520	MODULE_LICENSE("GPL");
	521
e9ce1cd3	522	static int __init pedit_init_module(void)
1da177e4	523	{
ddf97ccd	524	return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
1da177e4 LT	525	}
1da177e4 LT	526
e9ce1cd3	527	static void __exit pedit_cleanup_module(void)
1da177e4	528	{
ddf97ccd	529	tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
1da177e4 LT	530	}
	531
	532	module_init(pedit_init_module);
	533	module_exit(pedit_cleanup_module);