[linux-block.git] / net / sched / act_tunnel_key.c

/*
 * Copyright (c) 2016, Amir Vadai <amir@vadai.me>
 * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/dst.h>

#include <linux/tc_act/tc_tunnel_key.h>
#include <net/tc_act/tc_tunnel_key.h>

static unsigned int tunnel_key_net_id;
static struct tc_action_ops act_tunnel_key_ops;

static int tunnel_key_act(struct sk_buff *skb, const struct tc_action *a,
			  struct tcf_result *res)
{
	struct tcf_tunnel_key *t = to_tunnel_key(a);
	struct tcf_tunnel_key_params *params;
	int action;

	rcu_read_lock();

	params = rcu_dereference(t->params);

	tcf_lastuse_update(&t->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
	action = params->action;

	switch (params->tcft_action) {
	case TCA_TUNNEL_KEY_ACT_RELEASE:
		skb_dst_drop(skb);
		break;
	case TCA_TUNNEL_KEY_ACT_SET:
		skb_dst_drop(skb);
		skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
		break;
	default:
		WARN_ONCE(1, "Bad tunnel_key action %d.\n",
			  params->tcft_action);
		break;
	}

	rcu_read_unlock();

	return action;
}

static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
	[TCA_TUNNEL_KEY_PARMS]	    = { .len = sizeof(struct tc_tunnel_key) },
	[TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
	[TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
	[TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
	[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
	[TCA_TUNNEL_KEY_ENC_KEY_ID]   = { .type = NLA_U32 },
	[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
	[TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
};

static int tunnel_key_init(struct net *net, struct nlattr *nla,
			   struct nlattr *est, struct tc_action **a,
			   int ovr, int bind, struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
	struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
	struct tcf_tunnel_key_params *params_old;
	struct tcf_tunnel_key_params *params_new;
	struct metadata_dst *metadata = NULL;
	struct tc_tunnel_key *parm;
	struct tcf_tunnel_key *t;
	bool exists = false;
	__be16 dst_port = 0;
	__be64 key_id;
	__be16 flags;
	int ret = 0;
	int err;

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

	err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
			       extack);
	if (err < 0) {
		NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
		return err;
	}

	if (!tb[TCA_TUNNEL_KEY_PARMS]) {
		NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
		return -EINVAL;
	}

	parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
	exists = tcf_idr_check(tn, parm->index, a, bind);
	if (exists && bind)
		return 0;

	switch (parm->t_action) {
	case TCA_TUNNEL_KEY_ACT_RELEASE:
		break;
	case TCA_TUNNEL_KEY_ACT_SET:
		if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
			NL_SET_ERR_MSG(extack, "Missing tunnel key id");
			ret = -EINVAL;
			goto err_out;
		}

		key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));

		flags = TUNNEL_KEY | TUNNEL_CSUM;
		if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
		    nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
			flags &= ~TUNNEL_CSUM;

		if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
			dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);

		if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
		    tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
			__be32 saddr;
			__be32 daddr;

			saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
			daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);

			metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
						    dst_port, flags,
						    key_id, 0);
		} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
			   tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
			struct in6_addr saddr;
			struct in6_addr daddr;

			saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
			daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);

			metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
						      0, flags,
						      key_id, 0);
		} else {
			NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
			ret = -EINVAL;
			goto err_out;
		}

		if (!metadata) {
			NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
			ret = -ENOMEM;
			goto err_out;
		}

		metadata->u.tun_info.mode |= IP_TUNNEL_INFO_TX;
		break;
	default:
		NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
		ret = -EINVAL;
		goto err_out;
	}

	if (!exists) {
		ret = tcf_idr_create(tn, parm->index, est, a,
				     &act_tunnel_key_ops, bind, true);
		if (ret) {
			NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
			return ret;
		}

		ret = ACT_P_CREATED;
	} else {
		tcf_idr_release(*a, bind);
		if (!ovr) {
			NL_SET_ERR_MSG(extack, "TC IDR already exists");
			return -EEXIST;
		}
	}

	t = to_tunnel_key(*a);

	ASSERT_RTNL();
	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	if (unlikely(!params_new)) {
		if (ret == ACT_P_CREATED)
			tcf_idr_release(*a, bind);
		NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
		return -ENOMEM;
	}

	params_old = rtnl_dereference(t->params);

	params_new->action = parm->action;
	params_new->tcft_action = parm->t_action;
	params_new->tcft_enc_metadata = metadata;

	rcu_assign_pointer(t->params, params_new);

	if (params_old)
		kfree_rcu(params_old, rcu);

	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);

	return ret;

err_out:
	if (exists)
		tcf_idr_release(*a, bind);
	return ret;
}

static void tunnel_key_release(struct tc_action *a)
{
	struct tcf_tunnel_key *t = to_tunnel_key(a);
	struct tcf_tunnel_key_params *params;

	params = rcu_dereference_protected(t->params, 1);
	if (params) {
		if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
			dst_release(&params->tcft_enc_metadata->dst);

		kfree_rcu(params, rcu);
	}
}

static int tunnel_key_dump_addresses(struct sk_buff *skb,
				     const struct ip_tunnel_info *info)
{
	unsigned short family = ip_tunnel_info_af(info);

	if (family == AF_INET) {
		__be32 saddr = info->key.u.ipv4.src;
		__be32 daddr = info->key.u.ipv4.dst;

		if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
		    !nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
			return 0;
	}

	if (family == AF_INET6) {
		const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
		const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;

		if (!nla_put_in6_addr(skb,
				      TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
		    !nla_put_in6_addr(skb,
				      TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
			return 0;
	}

	return -EINVAL;
}

static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
			   int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_tunnel_key *t = to_tunnel_key(a);
	struct tcf_tunnel_key_params *params;
	struct tc_tunnel_key opt = {
		.index    = t->tcf_index,
		.refcnt   = t->tcf_refcnt - ref,
		.bindcnt  = t->tcf_bindcnt - bind,
	};
	struct tcf_t tm;

	params = rtnl_dereference(t->params);

	opt.t_action = params->tcft_action;
	opt.action = params->action;

	if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
		struct ip_tunnel_key *key =
			&params->tcft_enc_metadata->u.tun_info.key;
		__be32 key_id = tunnel_id_to_key32(key->tun_id);

		if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
		    tunnel_key_dump_addresses(skb,
					      &params->tcft_enc_metadata->u.tun_info) ||
		    nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst) ||
		    nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
			       !(key->tun_flags & TUNNEL_CSUM)))
			goto nla_put_failure;
	}

	tcf_tm_dump(&tm, &t->tcf_tm);
	if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
			  &tm, TCA_TUNNEL_KEY_PAD))
		goto nla_put_failure;

	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}

static int tunnel_key_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, tunnel_key_net_id);

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

static int tunnel_key_search(struct net *net, struct tc_action **a, u32 index,
			     struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_tunnel_key_ops = {
	.kind		=	"tunnel_key",
	.type		=	TCA_ACT_TUNNEL_KEY,
	.owner		=	THIS_MODULE,
	.act		=	tunnel_key_act,
	.dump		=	tunnel_key_dump,
	.init		=	tunnel_key_init,
	.cleanup	=	tunnel_key_release,
	.walk		=	tunnel_key_walker,
	.lookup		=	tunnel_key_search,
	.size		=	sizeof(struct tcf_tunnel_key),
};

static __net_init int tunnel_key_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);

	return tc_action_net_init(tn, &act_tunnel_key_ops);
}

static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, tunnel_key_net_id);
}

static struct pernet_operations tunnel_key_net_ops = {
	.init = tunnel_key_init_net,
	.exit_batch = tunnel_key_exit_net,
	.id   = &tunnel_key_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init tunnel_key_init_module(void)
{
	return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
}

static void __exit tunnel_key_cleanup_module(void)
{
	tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
}

module_init(tunnel_key_init_module);
module_exit(tunnel_key_cleanup_module);

MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
MODULE_DESCRIPTION("ip tunnel manipulation actions");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d0f6dd8a AV	1	/*
	2	* Copyright (c) 2016, Amir Vadai <amir@vadai.me>
	3	* Copyright (c) 2016, Mellanox Technologies. All rights reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2 of the License, or
	8	* (at your option) any later version.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/kernel.h>
	14	#include <linux/skbuff.h>
	15	#include <linux/rtnetlink.h>
	16	#include <net/netlink.h>
	17	#include <net/pkt_sched.h>
	18	#include <net/dst.h>
d0f6dd8a AV	19
	20	#include <linux/tc_act/tc_tunnel_key.h>
	21	#include <net/tc_act/tc_tunnel_key.h>
	22
c7d03a00	23	static unsigned int tunnel_key_net_id;
d0f6dd8a AV	24	static struct tc_action_ops act_tunnel_key_ops;
	25
	26	static int tunnel_key_act(struct sk_buff skb, const struct tc_action a,
	27	struct tcf_result *res)
	28	{
	29	struct tcf_tunnel_key *t = to_tunnel_key(a);
	30	struct tcf_tunnel_key_params *params;
	31	int action;
	32
	33	rcu_read_lock();
	34
	35	params = rcu_dereference(t->params);
	36
	37	tcf_lastuse_update(&t->tcf_tm);
	38	bstats_cpu_update(this_cpu_ptr(t->common.cpu_bstats), skb);
	39	action = params->action;
	40
	41	switch (params->tcft_action) {
	42	case TCA_TUNNEL_KEY_ACT_RELEASE:
	43	skb_dst_drop(skb);
	44	break;
	45	case TCA_TUNNEL_KEY_ACT_SET:
	46	skb_dst_drop(skb);
	47	skb_dst_set(skb, dst_clone(&params->tcft_enc_metadata->dst));
	48	break;
	49	default:
	50	WARN_ONCE(1, "Bad tunnel_key action %d.\n",
	51	params->tcft_action);
	52	break;
	53	}
	54
	55	rcu_read_unlock();
	56
	57	return action;
	58	}
	59
	60	static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
	61	[TCA_TUNNEL_KEY_PARMS] = { .len = sizeof(struct tc_tunnel_key) },
	62	[TCA_TUNNEL_KEY_ENC_IPV4_SRC] = { .type = NLA_U32 },
	63	[TCA_TUNNEL_KEY_ENC_IPV4_DST] = { .type = NLA_U32 },
	64	[TCA_TUNNEL_KEY_ENC_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
	65	[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
	66	[TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 },
75bfbca0	67	[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
86087e17	68	[TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
d0f6dd8a AV	69	};
	70
	71	static int tunnel_key_init(struct net net, struct nlattr nla,
	72	struct nlattr est, struct tc_action *a,
589dad6d	73	int ovr, int bind, struct netlink_ext_ack *extack)
d0f6dd8a AV	74	{
	75	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
	76	struct nlattr *tb[TCA_TUNNEL_KEY_MAX + 1];
	77	struct tcf_tunnel_key_params *params_old;
	78	struct tcf_tunnel_key_params *params_new;
	79	struct metadata_dst *metadata = NULL;
	80	struct tc_tunnel_key *parm;
	81	struct tcf_tunnel_key *t;
	82	bool exists = false;
75bfbca0	83	__be16 dst_port = 0;
d0f6dd8a	84	__be64 key_id;
86087e17	85	__be16 flags;
d0f6dd8a AV	86	int ret = 0;
	87	int err;
	88
9d7298cd SH	89	if (!nla) {
9d7298cd SH	90	NL_SET_ERR_MSG(extack, "Tunnel requires attributes to be passed");
d0f6dd8a	91	return -EINVAL;
9d7298cd	92	}
d0f6dd8a	93
fceb6435	94	err = nla_parse_nested(tb, TCA_TUNNEL_KEY_MAX, nla, tunnel_key_policy,
9d7298cd SH	95	extack);
	96	if (err < 0) {
	97	NL_SET_ERR_MSG(extack, "Failed to parse nested tunnel key attributes");
d0f6dd8a	98	return err;
9d7298cd	99	}
d0f6dd8a	100
9d7298cd SH	101	if (!tb[TCA_TUNNEL_KEY_PARMS]) {
9d7298cd SH	102	NL_SET_ERR_MSG(extack, "Missing tunnel key parameters");
d0f6dd8a	103	return -EINVAL;
9d7298cd	104	}
d0f6dd8a AV	105
d0f6dd8a AV	106	parm = nla_data(tb[TCA_TUNNEL_KEY_PARMS]);
65a206c0	107	exists = tcf_idr_check(tn, parm->index, a, bind);
d0f6dd8a AV	108	if (exists && bind)
	109	return 0;
	110
	111	switch (parm->t_action) {
	112	case TCA_TUNNEL_KEY_ACT_RELEASE:
	113	break;
	114	case TCA_TUNNEL_KEY_ACT_SET:
	115	if (!tb[TCA_TUNNEL_KEY_ENC_KEY_ID]) {
9d7298cd	116	NL_SET_ERR_MSG(extack, "Missing tunnel key id");
d0f6dd8a AV	117	ret = -EINVAL;
	118	goto err_out;
	119	}
	120
	121	key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
	122
86087e17 JB	123	flags = TUNNEL_KEY \| TUNNEL_CSUM;
	124	if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
	125	nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
	126	flags &= ~TUNNEL_CSUM;
	127
75bfbca0 HHZ	128	if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
	129	dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
	130
d0f6dd8a AV	131	if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
	132	tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
	133	__be32 saddr;
	134	__be32 daddr;
	135
	136	saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
	137	daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
	138
	139	metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
86087e17	140	dst_port, flags,
75bfbca0	141	key_id, 0);
d0f6dd8a AV	142	} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
	143	tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
	144	struct in6_addr saddr;
	145	struct in6_addr daddr;
	146
	147	saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
	148	daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
	149
dc594ecd	150	metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
86087e17	151	0, flags,
75bfbca0	152	key_id, 0);
a1165b59	153	} else {
9d7298cd	154	NL_SET_ERR_MSG(extack, "Missing either ipv4 or ipv6 src and dst");
a1165b59 SH	155	ret = -EINVAL;
a1165b59 SH	156	goto err_out;
d0f6dd8a AV	157	}
	158
	159	if (!metadata) {
9d7298cd	160	NL_SET_ERR_MSG(extack, "Cannot allocate tunnel metadata dst");
a1165b59	161	ret = -ENOMEM;
d0f6dd8a AV	162	goto err_out;
	163	}
	164
	165	metadata->u.tun_info.mode \|= IP_TUNNEL_INFO_TX;
	166	break;
	167	default:
9d7298cd	168	NL_SET_ERR_MSG(extack, "Unknown tunnel key action");
51d4740f	169	ret = -EINVAL;
d0f6dd8a AV	170	goto err_out;
	171	}
	172
	173	if (!exists) {
65a206c0 CM	174	ret = tcf_idr_create(tn, parm->index, est, a,
65a206c0 CM	175	&act_tunnel_key_ops, bind, true);
9d7298cd SH	176	if (ret) {
9d7298cd SH	177	NL_SET_ERR_MSG(extack, "Cannot create TC IDR");
d0f6dd8a	178	return ret;
9d7298cd	179	}
d0f6dd8a AV	180
	181	ret = ACT_P_CREATED;
	182	} else {
65a206c0	183	tcf_idr_release(*a, bind);
9d7298cd SH	184	if (!ovr) {
9d7298cd SH	185	NL_SET_ERR_MSG(extack, "TC IDR already exists");
d0f6dd8a	186	return -EEXIST;
9d7298cd	187	}
d0f6dd8a AV	188	}
	189
	190	t = to_tunnel_key(*a);
	191
	192	ASSERT_RTNL();
	193	params_new = kzalloc(sizeof(*params_new), GFP_KERNEL);
	194	if (unlikely(!params_new)) {
	195	if (ret == ACT_P_CREATED)
65a206c0	196	tcf_idr_release(*a, bind);
9d7298cd	197	NL_SET_ERR_MSG(extack, "Cannot allocate tunnel key parameters");
d0f6dd8a AV	198	return -ENOMEM;
	199	}
	200
	201	params_old = rtnl_dereference(t->params);
	202
	203	params_new->action = parm->action;
	204	params_new->tcft_action = parm->t_action;
	205	params_new->tcft_enc_metadata = metadata;
	206
	207	rcu_assign_pointer(t->params, params_new);
	208
	209	if (params_old)
	210	kfree_rcu(params_old, rcu);
	211
	212	if (ret == ACT_P_CREATED)
65a206c0	213	tcf_idr_insert(tn, *a);
d0f6dd8a AV	214
	215	return ret;
	216
	217	err_out:
	218	if (exists)
65a206c0	219	tcf_idr_release(*a, bind);
d0f6dd8a AV	220	return ret;
	221	}
	222
9a63b255	223	static void tunnel_key_release(struct tc_action *a)
d0f6dd8a AV	224	{
	225	struct tcf_tunnel_key *t = to_tunnel_key(a);
	226	struct tcf_tunnel_key_params *params;
	227
07c0f09e	228	params = rcu_dereference_protected(t->params, 1);
abdadd3c DC	229	if (params) {
	230	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET)
	231	dst_release(&params->tcft_enc_metadata->dst);
d0f6dd8a	232
abdadd3c DC	233	kfree_rcu(params, rcu);
abdadd3c DC	234	}
d0f6dd8a AV	235	}
	236
	237	static int tunnel_key_dump_addresses(struct sk_buff *skb,
	238	const struct ip_tunnel_info *info)
	239	{
	240	unsigned short family = ip_tunnel_info_af(info);
	241
	242	if (family == AF_INET) {
	243	__be32 saddr = info->key.u.ipv4.src;
	244	__be32 daddr = info->key.u.ipv4.dst;
	245
	246	if (!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_SRC, saddr) &&
	247	!nla_put_in_addr(skb, TCA_TUNNEL_KEY_ENC_IPV4_DST, daddr))
	248	return 0;
	249	}
	250
	251	if (family == AF_INET6) {
	252	const struct in6_addr *saddr6 = &info->key.u.ipv6.src;
	253	const struct in6_addr *daddr6 = &info->key.u.ipv6.dst;
	254
	255	if (!nla_put_in6_addr(skb,
	256	TCA_TUNNEL_KEY_ENC_IPV6_SRC, saddr6) &&
	257	!nla_put_in6_addr(skb,
	258	TCA_TUNNEL_KEY_ENC_IPV6_DST, daddr6))
	259	return 0;
	260	}
	261
	262	return -EINVAL;
	263	}
	264
	265	static int tunnel_key_dump(struct sk_buff skb, struct tc_action a,
	266	int bind, int ref)
	267	{
	268	unsigned char *b = skb_tail_pointer(skb);
	269	struct tcf_tunnel_key *t = to_tunnel_key(a);
	270	struct tcf_tunnel_key_params *params;
	271	struct tc_tunnel_key opt = {
	272	.index = t->tcf_index,
	273	.refcnt = t->tcf_refcnt - ref,
	274	.bindcnt = t->tcf_bindcnt - bind,
	275	};
	276	struct tcf_t tm;
d0f6dd8a	277
07c0f09e	278	params = rtnl_dereference(t->params);
d0f6dd8a AV	279
	280	opt.t_action = params->tcft_action;
	281	opt.action = params->action;
	282
	283	if (nla_put(skb, TCA_TUNNEL_KEY_PARMS, sizeof(opt), &opt))
	284	goto nla_put_failure;
	285
	286	if (params->tcft_action == TCA_TUNNEL_KEY_ACT_SET) {
	287	struct ip_tunnel_key *key =
	288	&params->tcft_enc_metadata->u.tun_info.key;
	289	__be32 key_id = tunnel_id_to_key32(key->tun_id);
	290
	291	if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) \|\|
	292	tunnel_key_dump_addresses(skb,
75bfbca0	293	&params->tcft_enc_metadata->u.tun_info) \|\|
86087e17 JB	294	nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst) \|\|
	295	nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
	296	!(key->tun_flags & TUNNEL_CSUM)))
d0f6dd8a AV	297	goto nla_put_failure;
	298	}
	299
	300	tcf_tm_dump(&tm, &t->tcf_tm);
	301	if (nla_put_64bit(skb, TCA_TUNNEL_KEY_TM, sizeof(tm),
	302	&tm, TCA_TUNNEL_KEY_PAD))
	303	goto nla_put_failure;
	304
07c0f09e	305	return skb->len;
d0f6dd8a AV	306
	307	nla_put_failure:
	308	nlmsg_trim(skb, b);
07c0f09e	309	return -1;
d0f6dd8a AV	310	}
	311
	312	static int tunnel_key_walker(struct net net, struct sk_buff skb,
	313	struct netlink_callback *cb, int type,
41780105 AA	314	const struct tc_action_ops *ops,
41780105 AA	315	struct netlink_ext_ack *extack)
d0f6dd8a AV	316	{
	317	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
	318
b3620145	319	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
d0f6dd8a AV	320	}
d0f6dd8a AV	321
331a9295 AA	322	static int tunnel_key_search(struct net net, struct tc_action *a, u32 index,
331a9295 AA	323	struct netlink_ext_ack *extack)
d0f6dd8a AV	324	{
	325	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
	326
65a206c0	327	return tcf_idr_search(tn, a, index);
d0f6dd8a AV	328	}
	329
	330	static struct tc_action_ops act_tunnel_key_ops = {
	331	.kind = "tunnel_key",
	332	.type = TCA_ACT_TUNNEL_KEY,
	333	.owner = THIS_MODULE,
	334	.act = tunnel_key_act,
	335	.dump = tunnel_key_dump,
	336	.init = tunnel_key_init,
	337	.cleanup = tunnel_key_release,
	338	.walk = tunnel_key_walker,
	339	.lookup = tunnel_key_search,
	340	.size = sizeof(struct tcf_tunnel_key),
	341	};
	342
	343	static __net_init int tunnel_key_init_net(struct net *net)
	344	{
	345	struct tc_action_net *tn = net_generic(net, tunnel_key_net_id);
	346
c7e460ce	347	return tc_action_net_init(tn, &act_tunnel_key_ops);
d0f6dd8a AV	348	}
d0f6dd8a AV	349
039af9c6	350	static void __net_exit tunnel_key_exit_net(struct list_head *net_list)
d0f6dd8a	351	{
039af9c6	352	tc_action_net_exit(net_list, tunnel_key_net_id);
d0f6dd8a AV	353	}
	354
	355	static struct pernet_operations tunnel_key_net_ops = {
	356	.init = tunnel_key_init_net,
039af9c6	357	.exit_batch = tunnel_key_exit_net,
d0f6dd8a AV	358	.id = &tunnel_key_net_id,
	359	.size = sizeof(struct tc_action_net),
	360	};
	361
	362	static int __init tunnel_key_init_module(void)
	363	{
	364	return tcf_register_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
	365	}
	366
	367	static void __exit tunnel_key_cleanup_module(void)
	368	{
	369	tcf_unregister_action(&act_tunnel_key_ops, &tunnel_key_net_ops);
	370	}
	371
	372	module_init(tunnel_key_init_module);
	373	module_exit(tunnel_key_cleanup_module);
	374
	375	MODULE_AUTHOR("Amir Vadai <amir@vadai.me>");
	376	MODULE_DESCRIPTION("ip tunnel manipulation actions");
	377	MODULE_LICENSE("GPL v2");