[mirror_ubuntu-hirsute-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>
#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(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);

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

		key_start = nla_nest_start(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(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
	73	err = nla_parse_nested(tb, TCA_PEDIT_KEY_EX_MAX, ka,
fceb6435	74	pedit_key_ex_policy, NULL);
71d0ed70 AV	75	if (err)
	76	goto err_out;
	77
853a14ba AV	78	if (!tb[TCA_PEDIT_KEY_EX_HTYPE] \|\|
853a14ba AV	79	!tb[TCA_PEDIT_KEY_EX_CMD]) {
71d0ed70 AV	80	err = -EINVAL;
	81	goto err_out;
	82	}
	83
	84	k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]);
853a14ba	85	k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]);
71d0ed70	86
853a14ba AV	87	if (k->htype > TCA_PEDIT_HDR_TYPE_MAX \|\|
853a14ba AV	88	k->cmd > TCA_PEDIT_CMD_MAX) {
71d0ed70 AV	89	err = -EINVAL;
	90	goto err_out;
	91	}
	92
	93	k++;
	94	}
	95
c4f65b09 DC	96	if (n) {
c4f65b09 DC	97	err = -EINVAL;
71d0ed70	98	goto err_out;
c4f65b09	99	}
71d0ed70 AV	100
	101	return keys_ex;
	102
	103	err_out:
	104	kfree(keys_ex);
	105	return ERR_PTR(err);
	106	}
	107
	108	static int tcf_pedit_key_ex_dump(struct sk_buff *skb,
	109	struct tcf_pedit_key_ex *keys_ex, int n)
	110	{
	111	struct nlattr *keys_start = nla_nest_start(skb, TCA_PEDIT_KEYS_EX);
	112
85eb9af1 DC	113	if (!keys_start)
85eb9af1 DC	114	goto nla_failure;
71d0ed70 AV	115	for (; n > 0; n--) {
	116	struct nlattr *key_start;
	117
	118	key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX);
85eb9af1 DC	119	if (!key_start)
85eb9af1 DC	120	goto nla_failure;
71d0ed70	121
853a14ba	122	if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) \|\|
85eb9af1 DC	123	nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd))
85eb9af1 DC	124	goto nla_failure;
71d0ed70 AV	125
	126	nla_nest_end(skb, key_start);
	127
	128	keys_ex++;
	129	}
	130
	131	nla_nest_end(skb, keys_start);
	132
	133	return 0;
85eb9af1 DC	134	nla_failure:
	135	nla_nest_cancel(skb, keys_start);
	136	return -EINVAL;
71d0ed70 AV	137	}
71d0ed70 AV	138
c1b52739	139	static int tcf_pedit_init(struct net net, struct nlattr nla,
a85a970a	140	struct nlattr est, struct tc_action *a,
789871bb	141	int ovr, int bind, bool rtnl_held,
85d0966f	142	struct tcf_proto tp, struct netlink_ext_ack extack)
1da177e4	143	{
ddf97ccd	144	struct tc_action_net *tn = net_generic(net, pedit_net_id);
7ba699c6	145	struct nlattr *tb[TCA_PEDIT_MAX + 1];
6ac86ca3	146	struct tcf_chain *goto_ch = NULL;
1da177e4	147	struct tc_pedit_key *keys = NULL;
71d0ed70	148	struct tcf_pedit_key_ex *keys_ex;
80f0f574 RM	149	struct tc_pedit *parm;
	150	struct nlattr *pattr;
	151	struct tcf_pedit *p;
	152	int ret = 0, err;
1da177e4 LT	153	int ksize;
1da177e4 LT	154
9868c0b2 RM	155	if (!nla) {
9868c0b2 RM	156	NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
1da177e4	157	return -EINVAL;
9868c0b2	158	}
1da177e4	159
fceb6435	160	err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
cee63723 PM	161	if (err < 0)
	162	return err;
	163
71d0ed70 AV	164	pattr = tb[TCA_PEDIT_PARMS];
	165	if (!pattr)
	166	pattr = tb[TCA_PEDIT_PARMS_EX];
9868c0b2 RM	167	if (!pattr) {
9868c0b2 RM	168	NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
1da177e4	169	return -EINVAL;
9868c0b2	170	}
71d0ed70 AV	171
71d0ed70 AV	172	parm = nla_data(pattr);
1da177e4	173	ksize = parm->nkeys * sizeof(struct tc_pedit_key);
9868c0b2 RM	174	if (nla_len(pattr) < sizeof(*parm) + ksize) {
9868c0b2 RM	175	NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
1da177e4	176	return -EINVAL;
9868c0b2	177	}
1da177e4	178
71d0ed70 AV	179	keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
	180	if (IS_ERR(keys_ex))
	181	return PTR_ERR(keys_ex);
	182
0190c1d4 VB	183	err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
0190c1d4 VB	184	if (!err) {
9868c0b2	185	if (!parm->nkeys) {
0190c1d4	186	tcf_idr_cleanup(tn, parm->index);
9868c0b2	187	NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
30e99ed6 WY	188	ret = -EINVAL;
30e99ed6 WY	189	goto out_free;
9868c0b2	190	}
65a206c0 CM	191	ret = tcf_idr_create(tn, parm->index, est, a,
65a206c0 CM	192	&act_pedit_ops, bind, false);
0190c1d4 VB	193	if (ret) {
0190c1d4 VB	194	tcf_idr_cleanup(tn, parm->index);
30e99ed6	195	goto out_free;
0190c1d4	196	}
1da177e4	197	ret = ACT_P_CREATED;
0190c1d4	198	} else if (err > 0) {
1a29321e	199	if (bind)
30e99ed6	200	goto out_free;
30e99ed6 WY	201	if (!ovr) {
30e99ed6 WY	202	ret = -EEXIST;
67b0c1a3	203	goto out_release;
1da177e4	204	}
0190c1d4	205	} else {
19ab6910 DC	206	ret = err;
19ab6910 DC	207	goto out_free;
1da177e4 LT	208	}
1da177e4 LT	209
6ac86ca3 DC	210	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	211	if (err < 0) {
	212	ret = err;
	213	goto out_release;
	214	}
67b0c1a3	215	p = to_pedit(*a);
e9ce1cd3	216	spin_lock_bh(&p->tcf_lock);
67b0c1a3 VB	217
	218	if (ret == ACT_P_CREATED \|\|
	219	(p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) {
	220	keys = kmalloc(ksize, GFP_ATOMIC);
	221	if (!keys) {
	222	spin_unlock_bh(&p->tcf_lock);
	223	ret = -ENOMEM;
6ac86ca3	224	goto put_chain;
67b0c1a3	225	}
e9ce1cd3 DM	226	kfree(p->tcfp_keys);
	227	p->tcfp_keys = keys;
	228	p->tcfp_nkeys = parm->nkeys;
1da177e4	229	}
e9ce1cd3	230	memcpy(p->tcfp_keys, parm->keys, ksize);
71d0ed70	231
67b0c1a3	232	p->tcfp_flags = parm->flags;
6ac86ca3	233	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
67b0c1a3	234
71d0ed70 AV	235	kfree(p->tcfp_keys_ex);
	236	p->tcfp_keys_ex = keys_ex;
	237
e9ce1cd3	238	spin_unlock_bh(&p->tcf_lock);
6ac86ca3 DC	239	if (goto_ch)
6ac86ca3 DC	240	tcf_chain_put_by_act(goto_ch);
1da177e4	241	if (ret == ACT_P_CREATED)
65a206c0	242	tcf_idr_insert(tn, *a);
1da177e4	243	return ret;
67b0c1a3	244
6ac86ca3 DC	245	put_chain:
	246	if (goto_ch)
	247	tcf_chain_put_by_act(goto_ch);
67b0c1a3 VB	248	out_release:
67b0c1a3 VB	249	tcf_idr_release(*a, bind);
30e99ed6 WY	250	out_free:
	251	kfree(keys_ex);
	252	return ret;
	253
1da177e4 LT	254	}
1da177e4 LT	255
9a63b255	256	static void tcf_pedit_cleanup(struct tc_action *a)
1da177e4	257	{
a85a970a	258	struct tcf_pedit *p = to_pedit(a);
a5b5c958	259	struct tc_pedit_key *keys = p->tcfp_keys;
80f0f574	260
a5b5c958	261	kfree(keys);
71d0ed70	262	kfree(p->tcfp_keys_ex);
1da177e4 LT	263	}
1da177e4 LT	264
95c2027b AV	265	static bool offset_valid(struct sk_buff *skb, int offset)
	266	{
	267	if (offset > 0 && offset > skb->len)
	268	return false;
	269
	270	if (offset < 0 && -offset > skb_headroom(skb))
	271	return false;
	272
	273	return true;
	274	}
	275
71d0ed70 AV	276	static int pedit_skb_hdr_offset(struct sk_buff *skb,
	277	enum pedit_header_type htype, int *hoffset)
	278	{
	279	int ret = -EINVAL;
	280
	281	switch (htype) {
	282	case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH:
	283	if (skb_mac_header_was_set(skb)) {
	284	*hoffset = skb_mac_offset(skb);
	285	ret = 0;
	286	}
	287	break;
	288	case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK:
	289	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4:
	290	case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6:
	291	*hoffset = skb_network_offset(skb);
	292	ret = 0;
	293	break;
	294	case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP:
	295	case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP:
	296	if (skb_transport_header_was_set(skb)) {
	297	*hoffset = skb_transport_offset(skb);
	298	ret = 0;
	299	}
	300	break;
	301	default:
	302	ret = -EINVAL;
	303	break;
0a80848e	304	}
71d0ed70 AV	305
	306	return ret;
	307	}
	308
6a2b401c JHS	309	static int tcf_pedit_act(struct sk_buff skb, const struct tc_action a,
6a2b401c JHS	310	struct tcf_result *res)
1da177e4	311	{
a85a970a	312	struct tcf_pedit *p = to_pedit(a);
4749c3ef	313	int i;
1da177e4	314
14bbd6a5	315	if (skb_unclone(skb, GFP_ATOMIC))
cc7ec456	316	return p->tcf_action;
1da177e4	317
e9ce1cd3	318	spin_lock(&p->tcf_lock);
1da177e4	319
9c4a4e48	320	tcf_lastuse_update(&p->tcf_tm);
1da177e4	321
e9ce1cd3 DM	322	if (p->tcfp_nkeys > 0) {
e9ce1cd3 DM	323	struct tc_pedit_key *tkey = p->tcfp_keys;
71d0ed70	324	struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex;
80f0f574 RM	325	enum pedit_header_type htype =
80f0f574 RM	326	TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK;
853a14ba	327	enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET;
1da177e4	328
e9ce1cd3	329	for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
544377cd	330	u32 *ptr, hdata;
1da177e4	331	int offset = tkey->off;
71d0ed70	332	int hoffset;
853a14ba	333	u32 val;
71d0ed70 AV	334	int rc;
	335
	336	if (tkey_ex) {
	337	htype = tkey_ex->htype;
853a14ba AV	338	cmd = tkey_ex->cmd;
853a14ba AV	339
71d0ed70 AV	340	tkey_ex++;
	341	}
	342
	343	rc = pedit_skb_hdr_offset(skb, htype, &hoffset);
	344	if (rc) {
95b0d2dc	345	pr_info("tc action pedit bad header type specified (0x%x)\n",
71d0ed70 AV	346	htype);
	347	goto bad;
	348	}
1da177e4 LT	349
1da177e4 LT	350	if (tkey->offmask) {
43052741	351	u8 *d, _d;
db2c2417	352
71d0ed70	353	if (!offset_valid(skb, hoffset + tkey->at)) {
95b0d2dc	354	pr_info("tc action pedit 'at' offset %d out of bounds\n",
71d0ed70	355	hoffset + tkey->at);
95c2027b AV	356	goto bad;
95c2027b AV	357	}
80f0f574	358	d = skb_header_pointer(skb, hoffset + tkey->at,
6ff7586e	359	sizeof(_d), &_d);
db2c2417	360	if (!d)
1da177e4	361	goto bad;
db2c2417	362	offset += (*d & tkey->offmask) >> tkey->shift;
1da177e4 LT	363	}
	364
	365	if (offset % 4) {
95b0d2dc	366	pr_info("tc action pedit offset must be on 32 bit boundaries\n");
1da177e4 LT	367	goto bad;
1da177e4 LT	368	}
95c2027b	369
71d0ed70	370	if (!offset_valid(skb, hoffset + offset)) {
95b0d2dc	371	pr_info("tc action pedit offset %d out of bounds\n",
71d0ed70	372	hoffset + offset);
1da177e4 LT	373	goto bad;
	374	}
	375
80f0f574	376	ptr = skb_header_pointer(skb, hoffset + offset,
6ff7586e	377	sizeof(hdata), &hdata);
db2c2417 CG	378	if (!ptr)
db2c2417 CG	379	goto bad;
1da177e4	380	/* just do it, baby */
853a14ba AV	381	switch (cmd) {
	382	case TCA_PEDIT_KEY_EX_CMD_SET:
	383	val = tkey->val;
	384	break;
	385	case TCA_PEDIT_KEY_EX_CMD_ADD:
	386	val = (*ptr + tkey->val) & ~tkey->mask;
	387	break;
	388	default:
95b0d2dc	389	pr_info("tc action pedit bad command (%d)\n",
853a14ba AV	390	cmd);
	391	goto bad;
	392	}
	393
	394	ptr = ((ptr & tkey->mask) ^ val);
544377cd	395	if (ptr == &hdata)
71d0ed70	396	skb_store_bits(skb, hoffset + offset, ptr, 4);
1da177e4	397	}
10297b99	398
1da177e4	399	goto done;
80f0f574	400	} else {
6ff9c364	401	WARN(1, "pedit BUG: index %d\n", p->tcf_index);
80f0f574	402	}
1da177e4 LT	403
1da177e4 LT	404	bad:
e9ce1cd3	405	p->tcf_qstats.overlimits++;
1da177e4	406	done:
bfe0d029	407	bstats_update(&p->tcf_bstats, skb);
e9ce1cd3 DM	408	spin_unlock(&p->tcf_lock);
e9ce1cd3 DM	409	return p->tcf_action;
1da177e4 LT	410	}
1da177e4 LT	411
e9ce1cd3 DM	412	static int tcf_pedit_dump(struct sk_buff skb, struct tc_action a,
e9ce1cd3 DM	413	int bind, int ref)
1da177e4	414	{
27a884dc	415	unsigned char *b = skb_tail_pointer(skb);
a85a970a	416	struct tcf_pedit *p = to_pedit(a);
1da177e4	417	struct tc_pedit *opt;
1da177e4	418	struct tcf_t t;
10297b99 YH	419	int s;
10297b99 YH	420
8fe5756c	421	s = struct_size(opt, keys, p->tcfp_nkeys);
1da177e4 LT	422
1da177e4 LT	423	/* netlink spinlocks held above us - must use ATOMIC */
0da974f4	424	opt = kzalloc(s, GFP_ATOMIC);
e9ce1cd3	425	if (unlikely(!opt))
1da177e4	426	return -ENOBUFS;
1da177e4	427
67b0c1a3	428	spin_lock_bh(&p->tcf_lock);
e9ce1cd3 DM	429	memcpy(opt->keys, p->tcfp_keys,
	430	p->tcfp_nkeys * sizeof(struct tc_pedit_key));
	431	opt->index = p->tcf_index;
	432	opt->nkeys = p->tcfp_nkeys;
	433	opt->flags = p->tcfp_flags;
	434	opt->action = p->tcf_action;
036bb443 VB	435	opt->refcnt = refcount_read(&p->tcf_refcnt) - ref;
036bb443 VB	436	opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind;
1da177e4	437
71d0ed70	438	if (p->tcfp_keys_ex) {
85eb9af1 DC	439	if (tcf_pedit_key_ex_dump(skb,
	440	p->tcfp_keys_ex,
	441	p->tcfp_nkeys))
	442	goto nla_put_failure;
71d0ed70 AV	443
	444	if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt))
	445	goto nla_put_failure;
	446	} else {
	447	if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
	448	goto nla_put_failure;
	449	}
48d8ee16 JHS	450
48d8ee16 JHS	451	tcf_tm_dump(&t, &p->tcf_tm);
9854518e	452	if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD))
1b34ec43	453	goto nla_put_failure;
67b0c1a3	454	spin_unlock_bh(&p->tcf_lock);
48d8ee16	455
541673c8	456	kfree(opt);
1da177e4 LT	457	return skb->len;
1da177e4 LT	458
7ba699c6	459	nla_put_failure:
67b0c1a3	460	spin_unlock_bh(&p->tcf_lock);
dc5fc579	461	nlmsg_trim(skb, b);
541673c8	462	kfree(opt);
1da177e4 LT	463	return -1;
	464	}
	465
ddf97ccd WC	466	static int tcf_pedit_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	467	struct netlink_callback *cb, int type,
41780105 AA	468	const struct tc_action_ops *ops,
41780105 AA	469	struct netlink_ext_ack *extack)
ddf97ccd WC	470	{
	471	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	472
b3620145	473	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	474	}
ddf97ccd WC	475
f061b48c	476	static int tcf_pedit_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	477	{
	478	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	479
65a206c0	480	return tcf_idr_search(tn, a, index);
ddf97ccd WC	481	}
ddf97ccd WC	482
e9ce1cd3	483	static struct tc_action_ops act_pedit_ops = {
1da177e4	484	.kind = "pedit",
eddd2cf1	485	.id = TCA_ID_PEDIT,
1da177e4	486	.owner = THIS_MODULE,
6a2b401c	487	.act = tcf_pedit_act,
1da177e4 LT	488	.dump = tcf_pedit_dump,
1da177e4 LT	489	.cleanup = tcf_pedit_cleanup,
1da177e4	490	.init = tcf_pedit_init,
ddf97ccd WC	491	.walk = tcf_pedit_walker,
ddf97ccd WC	492	.lookup = tcf_pedit_search,
a85a970a	493	.size = sizeof(struct tcf_pedit),
ddf97ccd WC	494	};
	495
	496	static __net_init int pedit_init_net(struct net *net)
	497	{
	498	struct tc_action_net *tn = net_generic(net, pedit_net_id);
	499
c7e460ce	500	return tc_action_net_init(tn, &act_pedit_ops);
ddf97ccd WC	501	}
ddf97ccd WC	502
039af9c6	503	static void __net_exit pedit_exit_net(struct list_head *net_list)
ddf97ccd	504	{
039af9c6	505	tc_action_net_exit(net_list, pedit_net_id);
ddf97ccd WC	506	}
	507
	508	static struct pernet_operations pedit_net_ops = {
	509	.init = pedit_init_net,
039af9c6	510	.exit_batch = pedit_exit_net,
ddf97ccd WC	511	.id = &pedit_net_id,
ddf97ccd WC	512	.size = sizeof(struct tc_action_net),
1da177e4 LT	513	};
	514
	515	MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
	516	MODULE_DESCRIPTION("Generic Packet Editor actions");
	517	MODULE_LICENSE("GPL");
	518
e9ce1cd3	519	static int __init pedit_init_module(void)
1da177e4	520	{
ddf97ccd	521	return tcf_register_action(&act_pedit_ops, &pedit_net_ops);
1da177e4 LT	522	}
1da177e4 LT	523
e9ce1cd3	524	static void __exit pedit_cleanup_module(void)
1da177e4	525	{
ddf97ccd	526	tcf_unregister_action(&act_pedit_ops, &pedit_net_ops);
1da177e4 LT	527	}
	528
	529	module_init(pedit_init_module);
	530	module_exit(pedit_cleanup_module);