[mirror_ubuntu-artful-kernel.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>

#define PEDIT_TAB_MASK	15

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(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(skb, TCA_PEDIT_KEYS_EX);

	for (; n > 0; n--) {
		struct nlattr *key_start;

		key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);

		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)) {
			nlmsg_trim(skb, keys_start);
			return -EINVAL;
		}

		nla_nest_end(skb, key_start);

		keys_ex++;
	}

	nla_nest_end(skb, keys_start);

	return 0;
}

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

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested(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)
		return -EINVAL;

	parm = nla_data(pattr);
	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
	if (nla_len(pattr) < sizeof(*parm) + ksize)
		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);

	if (!tcf_hash_check(tn, parm->index, a, bind)) {
		if (!parm->nkeys)
			return -EINVAL;
		ret = tcf_hash_create(tn, parm->index, est, a,
				      &act_pedit_ops, bind, false);
		if (ret)
			return ret;
		p = to_pedit(*a);
		keys = kmalloc(ksize, GFP_KERNEL);
		if (keys == NULL) {
			tcf_hash_cleanup(*a, est);
			kfree(keys_ex);
			return -ENOMEM;
		}
		ret = ACT_P_CREATED;
	} else {
		if (bind)
			return 0;
		tcf_hash_release(*a, bind);
		if (!ovr)
			return -EEXIST;
		p = to_pedit(*a);
		if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
			keys = kmalloc(ksize, GFP_KERNEL);
			if (!keys) {
				kfree(keys_ex);
				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);

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

	spin_unlock_bh(&p->tcf_lock);
	if (ret == ACT_P_CREATED)
		tcf_hash_insert(tn, *a);
	return ret;
}

static void tcf_pedit_cleanup(struct tc_action *a, int bind)
{
	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(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, _data;
			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 filter pedit bad header type specified (0x%x)\n",
					htype);
				goto bad;
			}

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

				if (!offset_valid(skb, hoffset + tkey->at)) {
					pr_info("tc filter pedit 'at' offset %d out of bounds\n",
						hoffset + tkey->at);
					goto bad;
				}
				d = skb_header_pointer(skb, hoffset + 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_valid(skb, hoffset + offset)) {
				pr_info("tc filter pedit offset %d out of bounds\n",
					hoffset + offset);
				goto bad;
			}

			ptr = skb_header_pointer(skb, hoffset + offset, 4, &_data);
			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 filter pedit bad command (%d)\n",
					cmd);
				goto bad;
			}

			*ptr = ((*ptr & tkey->mask) ^ val);
			if (ptr == &_data)
				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 = 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 (p->tcfp_keys_ex) {
		tcf_pedit_key_ex_dump(skb, p->tcfp_keys_ex, p->tcfp_nkeys);

		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;

	kfree(opt);
	return skb->len;

nla_put_failure:
	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 tc_action_net *tn = net_generic(net, pedit_net_id);

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

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_hash_search(tn, a, index);
}

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,
	.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, PEDIT_TAB_MASK);
}

static void __net_exit pedit_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, pedit_net_id);

	tc_action_net_exit(tn);
}

static struct pernet_operations pedit_net_ops = {
	.init = pedit_init_net,
	.exit = 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>
1da177e4	26
e9ce1cd3	27	#define PEDIT_TAB_MASK 15
1da177e4	28
c7d03a00	29	static unsigned int pedit_net_id;
a85a970a	30	static struct tc_action_ops act_pedit_ops;
ddf97ccd	31
53b2bf3f	32	static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
53f7e35f	33	[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
71d0ed70	34	[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED },
53b2bf3f PM	35	};
53b2bf3f PM	36
71d0ed70 AV	37	static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
71d0ed70 AV	38	[TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 },
853a14ba	39	[TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 },
71d0ed70 AV	40	};
	41
	42	static struct tcf_pedit_key_ex tcf_pedit_keys_ex_parse(struct nlattr nla,
	43	u8 n)
	44	{
	45	struct tcf_pedit_key_ex *keys_ex;
	46	struct tcf_pedit_key_ex *k;
	47	const struct nlattr *ka;
	48	int err = -EINVAL;
	49	int rem;
	50
	51	if (!nla \|\| !n)
	52	return NULL;
	53
	54	keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL);
	55	if (!keys_ex)
	56	return ERR_PTR(-ENOMEM);
	57
	58	k = keys_ex;
	59
	60	nla_for_each_nested(ka, nla, rem) {
	61	struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
	62
	63	if (!n) {
	64	err = -EINVAL;
	65	goto err_out;
	66	}
	67	n--;
	68
	69	if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
	70	err = -EINVAL;
	71	goto err_out;
	72	}
	73
	74	err = nla_parse_nested(tb, TCA_PEDIT_KEY_EX_MAX, ka,
fceb6435	75	pedit_key_ex_policy, 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	{
	112	struct nlattr *keys_start = nla_nest_start(skb, TCA_PEDIT_KEYS_EX);
	113
	114	for (; n > 0; n--) {
	115	struct nlattr *key_start;
	116
	117	key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);
	118
853a14ba AV	119	if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) \|\|
853a14ba AV	120	nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd)) {
71d0ed70 AV	121	nlmsg_trim(skb, keys_start);
	122	return -EINVAL;
	123	}
	124
	125	nla_nest_end(skb, key_start);
	126
	127	keys_ex++;
	128	}
	129
	130	nla_nest_end(skb, keys_start);
	131
	132	return 0;
	133	}
	134
c1b52739	135	static int tcf_pedit_init(struct net net, struct nlattr nla,
a85a970a	136	struct nlattr est, struct tc_action *a,
c1b52739	137	int ovr, int bind)
1da177e4	138	{
ddf97ccd	139	struct tc_action_net *tn = net_generic(net, pedit_net_id);
7ba699c6	140	struct nlattr *tb[TCA_PEDIT_MAX + 1];
71d0ed70	141	struct nlattr *pattr;
1da177e4	142	struct tc_pedit *parm;
cee63723	143	int ret = 0, err;
1da177e4 LT	144	struct tcf_pedit *p;
1da177e4 LT	145	struct tc_pedit_key *keys = NULL;
71d0ed70	146	struct tcf_pedit_key_ex *keys_ex;
1da177e4 LT	147	int ksize;
1da177e4 LT	148
cee63723	149	if (nla == NULL)
1da177e4 LT	150	return -EINVAL;
1da177e4 LT	151
fceb6435	152	err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
cee63723 PM	153	if (err < 0)
	154	return err;
	155
71d0ed70 AV	156	pattr = tb[TCA_PEDIT_PARMS];
	157	if (!pattr)
	158	pattr = tb[TCA_PEDIT_PARMS_EX];
	159	if (!pattr)
1da177e4	160	return -EINVAL;
71d0ed70 AV	161
71d0ed70 AV	162	parm = nla_data(pattr);
1da177e4	163	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
71d0ed70	164	if (nla_len(pattr) < sizeof(*parm) + ksize)
1da177e4 LT	165	return -EINVAL;
1da177e4 LT	166
71d0ed70 AV	167	keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
	168	if (IS_ERR(keys_ex))
	169	return PTR_ERR(keys_ex);
	170
ddf97ccd	171	if (!tcf_hash_check(tn, parm->index, a, bind)) {
1da177e4 LT	172	if (!parm->nkeys)
1da177e4 LT	173	return -EINVAL;
ddf97ccd	174	ret = tcf_hash_create(tn, parm->index, est, a,
a85a970a	175	&act_pedit_ops, bind, false);
86062033 WC	176	if (ret)
86062033 WC	177	return ret;
a85a970a	178	p = to_pedit(*a);
1da177e4 LT	179	keys = kmalloc(ksize, GFP_KERNEL);
1da177e4 LT	180	if (keys == NULL) {
a85a970a	181	tcf_hash_cleanup(*a, est);
71d0ed70	182	kfree(keys_ex);
1da177e4 LT	183	return -ENOMEM;
	184	}
	185	ret = ACT_P_CREATED;
	186	} else {
1a29321e JHS	187	if (bind)
1a29321e JHS	188	return 0;
a85a970a	189	tcf_hash_release(*a, bind);
1a29321e	190	if (!ovr)
1da177e4	191	return -EEXIST;
a85a970a	192	p = to_pedit(*a);
e9ce1cd3	193	if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
1da177e4	194	keys = kmalloc(ksize, GFP_KERNEL);
71d0ed70 AV	195	if (!keys) {
71d0ed70 AV	196	kfree(keys_ex);
1da177e4	197	return -ENOMEM;
71d0ed70	198	}
1da177e4 LT	199	}
	200	}
	201
e9ce1cd3 DM	202	spin_lock_bh(&p->tcf_lock);
	203	p->tcfp_flags = parm->flags;
	204	p->tcf_action = parm->action;
1da177e4	205	if (keys) {
e9ce1cd3 DM	206	kfree(p->tcfp_keys);
	207	p->tcfp_keys = keys;
	208	p->tcfp_nkeys = parm->nkeys;
1da177e4	209	}
e9ce1cd3	210	memcpy(p->tcfp_keys, parm->keys, ksize);
71d0ed70 AV	211
	212	kfree(p->tcfp_keys_ex);
	213	p->tcfp_keys_ex = keys_ex;
	214
e9ce1cd3	215	spin_unlock_bh(&p->tcf_lock);
1da177e4	216	if (ret == ACT_P_CREATED)
a85a970a	217	tcf_hash_insert(tn, *a);
1da177e4 LT	218	return ret;
	219	}
	220
a5b5c958	221	static void tcf_pedit_cleanup(struct tc_action *a, int bind)
1da177e4	222	{
a85a970a	223	struct tcf_pedit *p = to_pedit(a);
a5b5c958 WC	224	struct tc_pedit_key *keys = p->tcfp_keys;
a5b5c958 WC	225	kfree(keys);
71d0ed70	226	kfree(p->tcfp_keys_ex);
1da177e4 LT	227	}
1da177e4 LT	228
95c2027b AV	229	static bool offset_valid(struct sk_buff *skb, int offset)
	230	{
	231	if (offset > 0 && offset > skb->len)
	232	return false;
	233
	234	if (offset < 0 && -offset > skb_headroom(skb))
	235	return false;
	236
	237	return true;
	238	}
	239
71d0ed70 AV	240	static int pedit_skb_hdr_offset(struct sk_buff *skb,
	241	enum pedit_header_type htype, int *hoffset)
	242	{
	243	int ret = -EINVAL;
	244
	245	switch (htype) {
	246	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
	247	if (skb_mac_header_was_set(skb)) {
	248	*hoffset = skb_mac_offset(skb);
	249	ret = 0;
	250	}
	251	break;
	252	case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
	253	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
	254	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
	255	*hoffset = skb_network_offset(skb);
	256	ret = 0;
	257	break;
	258	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
	259	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
	260	if (skb_transport_header_was_set(skb)) {
	261	*hoffset = skb_transport_offset(skb);
	262	ret = 0;
	263	}
	264	break;
	265	default:
	266	ret = -EINVAL;
	267	break;
	268	};
	269
	270	return ret;
	271	}
	272
dc7f9f6e	273	static int tcf_pedit(struct sk_buff skb, const struct tc_action a,
e9ce1cd3	274	struct tcf_result *res)
1da177e4	275	{
a85a970a	276	struct tcf_pedit *p = to_pedit(a);
4749c3ef	277	int i;
1da177e4	278
14bbd6a5	279	if (skb_unclone(skb, GFP_ATOMIC))
cc7ec456	280	return p->tcf_action;
1da177e4	281
e9ce1cd3	282	spin_lock(&p->tcf_lock);
1da177e4	283
9c4a4e48	284	tcf_lastuse_update(&p->tcf_tm);
1da177e4	285
e9ce1cd3 DM	286	if (p->tcfp_nkeys > 0) {
e9ce1cd3 DM	287	struct tc_pedit_key *tkey = p->tcfp_keys;
71d0ed70 AV	288	struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
71d0ed70 AV	289	enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
853a14ba	290	enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
1da177e4	291
e9ce1cd3	292	for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
db2c2417	293	u32 *ptr, _data;
1da177e4	294	int offset = tkey->off;
71d0ed70	295	int hoffset;
853a14ba	296	u32 val;
71d0ed70 AV	297	int rc;
	298
	299	if (tkey_ex) {
	300	htype = tkey_ex->htype;
853a14ba AV	301	cmd = tkey_ex->cmd;
853a14ba AV	302
71d0ed70 AV	303	tkey_ex++;
	304	}
	305
	306	rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
	307	if (rc) {
	308	pr_info("tc filter pedit bad header type specified (0x%x)\n",
	309	htype);
	310	goto bad;
	311	}
1da177e4 LT	312
1da177e4 LT	313	if (tkey->offmask) {
db2c2417 CG	314	char *d, _d;
db2c2417 CG	315
71d0ed70	316	if (!offset_valid(skb, hoffset + tkey->at)) {
95c2027b	317	pr_info("tc filter pedit 'at' offset %d out of bounds\n",
71d0ed70	318	hoffset + tkey->at);
95c2027b AV	319	goto bad;
95c2027b AV	320	}
71d0ed70	321	d = skb_header_pointer(skb, hoffset + tkey->at, 1,
db2c2417 CG	322	&_d);
db2c2417 CG	323	if (!d)
1da177e4	324	goto bad;
db2c2417	325	offset += (*d & tkey->offmask) >> tkey->shift;
1da177e4 LT	326	}
	327
	328	if (offset % 4) {
6ff9c364	329	pr_info("tc filter pedit"
6ff9c364	330	" offset must be on 32 bit boundaries\n");
1da177e4 LT	331	goto bad;
1da177e4 LT	332	}
95c2027b	333
71d0ed70	334	if (!offset_valid(skb, hoffset + offset)) {
95c2027b	335	pr_info("tc filter pedit offset %d out of bounds\n",
71d0ed70	336	hoffset + offset);
1da177e4 LT	337	goto bad;
	338	}
	339
71d0ed70	340	ptr = skb_header_pointer(skb, hoffset + offset, 4, &_data);
db2c2417 CG	341	if (!ptr)
db2c2417 CG	342	goto bad;
1da177e4	343	/* just do it, baby */
853a14ba AV	344	switch (cmd) {
	345	case TCA_PEDIT_KEY_EX_CMD_SET:
	346	val = tkey->val;
	347	break;
	348	case TCA_PEDIT_KEY_EX_CMD_ADD:
	349	val = (*ptr + tkey->val) & ~tkey->mask;
	350	break;
	351	default:
	352	pr_info("tc filter pedit bad command (%d)\n",
	353	cmd);
	354	goto bad;
	355	}
	356
	357	ptr = ((ptr & tkey->mask) ^ val);
db2c2417	358	if (ptr == &_data)
71d0ed70	359	skb_store_bits(skb, hoffset + offset, ptr, 4);
1da177e4	360	}
10297b99	361
1da177e4	362	goto done;
6ff9c364	363	} else
6ff9c364	364	WARN(1, "pedit BUG: index %d\n", p->tcf_index);
1da177e4 LT	365
1da177e4 LT	366	bad:
e9ce1cd3	367	p->tcf_qstats.overlimits++;
1da177e4	368	done:
bfe0d029	369	bstats_update(&p->tcf_bstats, skb);
e9ce1cd3 DM	370	spin_unlock(&p->tcf_lock);
e9ce1cd3 DM	371	return p->tcf_action;
1da177e4 LT	372	}
1da177e4 LT	373
e9ce1cd3 DM	374	static int tcf_pedit_dump(struct sk_buff skb, struct tc_action a,
e9ce1cd3 DM	375	int bind, int ref)
1da177e4	376	{
27a884dc	377	unsigned char *b = skb_tail_pointer(skb);
a85a970a	378	struct tcf_pedit *p = to_pedit(a);
1da177e4	379	struct tc_pedit *opt;
1da177e4	380	struct tcf_t t;
10297b99 YH	381	int s;
10297b99 YH	382
e9ce1cd3	383	s = sizeof(opt) + p->tcfp_nkeys sizeof(struct tc_pedit_key);
1da177e4 LT	384
1da177e4 LT	385	/* netlink spinlocks held above us - must use ATOMIC */
0da974f4	386	opt = kzalloc(s, GFP_ATOMIC);
e9ce1cd3	387	if (unlikely(!opt))
1da177e4	388	return -ENOBUFS;
1da177e4	389
e9ce1cd3 DM	390	memcpy(opt->keys, p->tcfp_keys,
	391	p->tcfp_nkeys * sizeof(struct tc_pedit_key));
	392	opt->index = p->tcf_index;
	393	opt->nkeys = p->tcfp_nkeys;
	394	opt->flags = p->tcfp_flags;
	395	opt->action = p->tcf_action;
	396	opt->refcnt = p->tcf_refcnt - ref;
	397	opt->bindcnt = p->tcf_bindcnt - bind;
1da177e4	398
71d0ed70 AV	399	if (p->tcfp_keys_ex) {
	400	tcf_pedit_key_ex_dump(skb, p->tcfp_keys_ex, p->tcfp_nkeys);
	401
	402	if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
	403	goto nla_put_failure;
	404	} else {
	405	if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
	406	goto nla_put_failure;
	407	}
48d8ee16 JHS	408
48d8ee16 JHS	409	tcf_tm_dump(&t, &p->tcf_tm);
9854518e	410	if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
1b34ec43	411	goto nla_put_failure;
48d8ee16	412
541673c8	413	kfree(opt);
1da177e4 LT	414	return skb->len;
1da177e4 LT	415
7ba699c6	416	nla_put_failure:
dc5fc579	417	nlmsg_trim(skb, b);
541673c8	418	kfree(opt);
1da177e4 LT	419	return -1;
	420	}
	421
ddf97ccd WC	422	static int tcf_pedit_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	423	struct netlink_callback *cb, int type,
a85a970a	424	const struct tc_action_ops *ops)
ddf97ccd WC	425	{
	426	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	427
a85a970a	428	return tcf_generic_walker(tn, skb, cb, type, ops);
ddf97ccd WC	429	}
ddf97ccd WC	430
a85a970a	431	static int tcf_pedit_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	432	{
	433	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	434
	435	return tcf_hash_search(tn, a, index);
	436	}
	437
e9ce1cd3	438	static struct tc_action_ops act_pedit_ops = {
1da177e4 LT	439	.kind = "pedit",
1da177e4 LT	440	.type = TCA_ACT_PEDIT,
1da177e4 LT	441	.owner = THIS_MODULE,
	442	.act = tcf_pedit,
	443	.dump = tcf_pedit_dump,
	444	.cleanup = tcf_pedit_cleanup,
1da177e4	445	.init = tcf_pedit_init,
ddf97ccd WC	446	.walk = tcf_pedit_walker,
ddf97ccd WC	447	.lookup = tcf_pedit_search,
a85a970a	448	.size = sizeof(struct tcf_pedit),
ddf97ccd WC	449	};
	450
	451	static __net_init int pedit_init_net(struct net *net)
	452	{
	453	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	454
	455	return tc_action_net_init(tn, &act_pedit_ops, PEDIT_TAB_MASK);
	456	}
	457
	458	static void __net_exit pedit_exit_net(struct net *net)
	459	{
	460	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	461
	462	tc_action_net_exit(tn);
	463	}
	464
	465	static struct pernet_operations pedit_net_ops = {
	466	.init = pedit_init_net,
	467	.exit = pedit_exit_net,
	468	.id = &pedit_net_id,
	469	.size = sizeof(struct tc_action_net),
1da177e4 LT	470	};
	471
	472	MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
	473	MODULE_DESCRIPTION("Generic Packet Editor actions");
	474	MODULE_LICENSE("GPL");
	475
e9ce1cd3	476	static int __init pedit_init_module(void)
1da177e4	477	{
ddf97ccd	478	return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
1da177e4 LT	479	}
1da177e4 LT	480
e9ce1cd3	481	static void __exit pedit_cleanup_module(void)
1da177e4	482	{
ddf97ccd	483	tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
1da177e4 LT	484	}
	485
	486	module_init(pedit_init_module);
	487	module_exit(pedit_cleanup_module);
	488