[mirror_ubuntu-jammy-kernel.git] / net / sched / act_mpls.c

// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
/* Copyright (C) 2019 Netronome Systems, Inc. */

#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mpls.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/tc_act/tc_mpls.h>
#include <net/mpls.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_mpls.h>

static unsigned int mpls_net_id;
static struct tc_action_ops act_mpls_ops;

#define ACT_MPLS_TTL_DEFAULT	255

static __be32 tcf_mpls_get_lse(struct mpls_shim_hdr *lse,
			       struct tcf_mpls_params *p, bool set_bos)
{
	u32 new_lse = 0;

	if (lse)
		new_lse = be32_to_cpu(lse->label_stack_entry);

	if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET) {
		new_lse &= ~MPLS_LS_LABEL_MASK;
		new_lse |= p->tcfm_label << MPLS_LS_LABEL_SHIFT;
	}
	if (p->tcfm_ttl) {
		new_lse &= ~MPLS_LS_TTL_MASK;
		new_lse |= p->tcfm_ttl << MPLS_LS_TTL_SHIFT;
	}
	if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET) {
		new_lse &= ~MPLS_LS_TC_MASK;
		new_lse |= p->tcfm_tc << MPLS_LS_TC_SHIFT;
	}
	if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET) {
		new_lse &= ~MPLS_LS_S_MASK;
		new_lse |= p->tcfm_bos << MPLS_LS_S_SHIFT;
	} else if (set_bos) {
		new_lse |= 1 << MPLS_LS_S_SHIFT;
	}

	return cpu_to_be32(new_lse);
}

static int tcf_mpls_act(struct sk_buff *skb, const struct tc_action *a,
			struct tcf_result *res)
{
	struct tcf_mpls *m = to_mpls(a);
	struct tcf_mpls_params *p;
	__be32 new_lse;
	int ret, mac_len;

	tcf_lastuse_update(&m->tcf_tm);
	bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);

	/* Ensure 'data' points at mac_header prior calling mpls manipulating
	 * functions.
	 */
	if (skb_at_tc_ingress(skb)) {
		skb_push_rcsum(skb, skb->mac_len);
		mac_len = skb->mac_len;
	} else {
		mac_len = skb_network_header(skb) - skb_mac_header(skb);
	}

	ret = READ_ONCE(m->tcf_action);

	p = rcu_dereference_bh(m->mpls_p);

	switch (p->tcfm_action) {
	case TCA_MPLS_ACT_POP:
		if (skb_mpls_pop(skb, p->tcfm_proto, mac_len,
				 skb->dev && skb->dev->type == ARPHRD_ETHER))
			goto drop;
		break;
	case TCA_MPLS_ACT_PUSH:
		new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb_protocol(skb, true)));
		if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len,
				  skb->dev && skb->dev->type == ARPHRD_ETHER))
			goto drop;
		break;
	case TCA_MPLS_ACT_MAC_PUSH:
		if (skb_vlan_tag_present(skb)) {
			if (__vlan_insert_inner_tag(skb, skb->vlan_proto,
						    skb_vlan_tag_get(skb),
						    ETH_HLEN) < 0)
				goto drop;

			skb->protocol = skb->vlan_proto;
			__vlan_hwaccel_clear_tag(skb);
		}

		new_lse = tcf_mpls_get_lse(NULL, p, mac_len ||
					   !eth_p_mpls(skb->protocol));

		if (skb_mpls_push(skb, new_lse, p->tcfm_proto, 0, false))
			goto drop;
		break;
	case TCA_MPLS_ACT_MODIFY:
		if (!pskb_may_pull(skb,
				   skb_network_offset(skb) + MPLS_HLEN))
			goto drop;
		new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false);
		if (skb_mpls_update_lse(skb, new_lse))
			goto drop;
		break;
	case TCA_MPLS_ACT_DEC_TTL:
		if (skb_mpls_dec_ttl(skb))
			goto drop;
		break;
	}

	if (skb_at_tc_ingress(skb))
		skb_pull_rcsum(skb, skb->mac_len);

	return ret;

drop:
	qstats_drop_inc(this_cpu_ptr(m->common.cpu_qstats));
	return TC_ACT_SHOT;
}

static int valid_label(const struct nlattr *attr,
		       struct netlink_ext_ack *extack)
{
	const u32 *label = nla_data(attr);

	if (*label & ~MPLS_LABEL_MASK || *label == MPLS_LABEL_IMPLNULL) {
		NL_SET_ERR_MSG_MOD(extack, "MPLS label out of range");
		return -EINVAL;
	}

	return 0;
}

static const struct nla_policy mpls_policy[TCA_MPLS_MAX + 1] = {
	[TCA_MPLS_PARMS]	= NLA_POLICY_EXACT_LEN(sizeof(struct tc_mpls)),
	[TCA_MPLS_PROTO]	= { .type = NLA_U16 },
	[TCA_MPLS_LABEL]	= NLA_POLICY_VALIDATE_FN(NLA_U32, valid_label),
	[TCA_MPLS_TC]		= NLA_POLICY_RANGE(NLA_U8, 0, 7),
	[TCA_MPLS_TTL]		= NLA_POLICY_MIN(NLA_U8, 1),
	[TCA_MPLS_BOS]		= NLA_POLICY_RANGE(NLA_U8, 0, 1),
};

static int tcf_mpls_init(struct net *net, struct nlattr *nla,
			 struct nlattr *est, struct tc_action **a,
			 struct tcf_proto *tp, u32 flags,
			 struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, mpls_net_id);
	bool bind = flags & TCA_ACT_FLAGS_BIND;
	struct nlattr *tb[TCA_MPLS_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tcf_mpls_params *p;
	struct tc_mpls *parm;
	bool exists = false;
	struct tcf_mpls *m;
	int ret = 0, err;
	u8 mpls_ttl = 0;
	u32 index;

	if (!nla) {
		NL_SET_ERR_MSG_MOD(extack, "Missing netlink attributes");
		return -EINVAL;
	}

	err = nla_parse_nested(tb, TCA_MPLS_MAX, nla, mpls_policy, extack);
	if (err < 0)
		return err;

	if (!tb[TCA_MPLS_PARMS]) {
		NL_SET_ERR_MSG_MOD(extack, "No MPLS params");
		return -EINVAL;
	}
	parm = nla_data(tb[TCA_MPLS_PARMS]);
	index = parm->index;

	/* Verify parameters against action type. */
	switch (parm->m_action) {
	case TCA_MPLS_ACT_POP:
		if (!tb[TCA_MPLS_PROTO]) {
			NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop");
			return -EINVAL;
		}
		if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
			NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop");
			return -EINVAL;
		}
		if (tb[TCA_MPLS_LABEL] || tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] ||
		    tb[TCA_MPLS_BOS]) {
			NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop");
			return -EINVAL;
		}
		break;
	case TCA_MPLS_ACT_DEC_TTL:
		if (tb[TCA_MPLS_PROTO] || tb[TCA_MPLS_LABEL] ||
		    tb[TCA_MPLS_TTL] || tb[TCA_MPLS_TC] || tb[TCA_MPLS_BOS]) {
			NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl");
			return -EINVAL;
		}
		break;
	case TCA_MPLS_ACT_PUSH:
	case TCA_MPLS_ACT_MAC_PUSH:
		if (!tb[TCA_MPLS_LABEL]) {
			NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push");
			return -EINVAL;
		}
		if (tb[TCA_MPLS_PROTO] &&
		    !eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
			NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push");
			return -EPROTONOSUPPORT;
		}
		/* Push needs a TTL - if not specified, set a default value. */
		if (!tb[TCA_MPLS_TTL]) {
#if IS_ENABLED(CONFIG_MPLS)
			mpls_ttl = net->mpls.default_ttl ?
				   net->mpls.default_ttl : ACT_MPLS_TTL_DEFAULT;
#else
			mpls_ttl = ACT_MPLS_TTL_DEFAULT;
#endif
		}
		break;
	case TCA_MPLS_ACT_MODIFY:
		if (tb[TCA_MPLS_PROTO]) {
			NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify");
			return -EINVAL;
		}
		break;
	default:
		NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action");
		return -EINVAL;
	}

	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
		return err;
	exists = err;
	if (exists && bind)
		return 0;

	if (!exists) {
		ret = tcf_idr_create(tn, index, est, a,
				     &act_mpls_ops, bind, true, 0);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}

		ret = ACT_P_CREATED;
	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
		tcf_idr_release(*a, bind);
		return -EEXIST;
	}

	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
		goto release_idr;

	m = to_mpls(*a);

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p) {
		err = -ENOMEM;
		goto put_chain;
	}

	p->tcfm_action = parm->m_action;
	p->tcfm_label = tb[TCA_MPLS_LABEL] ? nla_get_u32(tb[TCA_MPLS_LABEL]) :
					     ACT_MPLS_LABEL_NOT_SET;
	p->tcfm_tc = tb[TCA_MPLS_TC] ? nla_get_u8(tb[TCA_MPLS_TC]) :
				       ACT_MPLS_TC_NOT_SET;
	p->tcfm_ttl = tb[TCA_MPLS_TTL] ? nla_get_u8(tb[TCA_MPLS_TTL]) :
					 mpls_ttl;
	p->tcfm_bos = tb[TCA_MPLS_BOS] ? nla_get_u8(tb[TCA_MPLS_BOS]) :
					 ACT_MPLS_BOS_NOT_SET;
	p->tcfm_proto = tb[TCA_MPLS_PROTO] ? nla_get_be16(tb[TCA_MPLS_PROTO]) :
					     htons(ETH_P_MPLS_UC);

	spin_lock_bh(&m->tcf_lock);
	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	p = rcu_replace_pointer(m->mpls_p, p, lockdep_is_held(&m->tcf_lock));
	spin_unlock_bh(&m->tcf_lock);

	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
	if (p)
		kfree_rcu(p, rcu);

	return ret;
put_chain:
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);
release_idr:
	tcf_idr_release(*a, bind);
	return err;
}

static void tcf_mpls_cleanup(struct tc_action *a)
{
	struct tcf_mpls *m = to_mpls(a);
	struct tcf_mpls_params *p;

	p = rcu_dereference_protected(m->mpls_p, 1);
	if (p)
		kfree_rcu(p, rcu);
}

static int tcf_mpls_dump(struct sk_buff *skb, struct tc_action *a,
			 int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_mpls *m = to_mpls(a);
	struct tcf_mpls_params *p;
	struct tc_mpls opt = {
		.index    = m->tcf_index,
		.refcnt   = refcount_read(&m->tcf_refcnt) - ref,
		.bindcnt  = atomic_read(&m->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&m->tcf_lock);
	opt.action = m->tcf_action;
	p = rcu_dereference_protected(m->mpls_p, lockdep_is_held(&m->tcf_lock));
	opt.m_action = p->tcfm_action;

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

	if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET &&
	    nla_put_u32(skb, TCA_MPLS_LABEL, p->tcfm_label))
		goto nla_put_failure;

	if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET &&
	    nla_put_u8(skb, TCA_MPLS_TC, p->tcfm_tc))
		goto nla_put_failure;

	if (p->tcfm_ttl && nla_put_u8(skb, TCA_MPLS_TTL, p->tcfm_ttl))
		goto nla_put_failure;

	if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET &&
	    nla_put_u8(skb, TCA_MPLS_BOS, p->tcfm_bos))
		goto nla_put_failure;

	if (nla_put_be16(skb, TCA_MPLS_PROTO, p->tcfm_proto))
		goto nla_put_failure;

	tcf_tm_dump(&t, &m->tcf_tm);

	if (nla_put_64bit(skb, TCA_MPLS_TM, sizeof(t), &t, TCA_MPLS_PAD))
		goto nla_put_failure;

	spin_unlock_bh(&m->tcf_lock);

	return skb->len;

nla_put_failure:
	spin_unlock_bh(&m->tcf_lock);
	nlmsg_trim(skb, b);
	return -EMSGSIZE;
}

static int tcf_mpls_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, mpls_net_id);

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

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

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_mpls_ops = {
	.kind		=	"mpls",
	.id		=	TCA_ID_MPLS,
	.owner		=	THIS_MODULE,
	.act		=	tcf_mpls_act,
	.dump		=	tcf_mpls_dump,
	.init		=	tcf_mpls_init,
	.cleanup	=	tcf_mpls_cleanup,
	.walk		=	tcf_mpls_walker,
	.lookup		=	tcf_mpls_search,
	.size		=	sizeof(struct tcf_mpls),
};

static __net_init int mpls_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, mpls_net_id);

	return tc_action_net_init(net, tn, &act_mpls_ops);
}

static void __net_exit mpls_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, mpls_net_id);
}

static struct pernet_operations mpls_net_ops = {
	.init = mpls_init_net,
	.exit_batch = mpls_exit_net,
	.id   = &mpls_net_id,
	.size = sizeof(struct tc_action_net),
};

static int __init mpls_init_module(void)
{
	return tcf_register_action(&act_mpls_ops, &mpls_net_ops);
}

static void __exit mpls_cleanup_module(void)
{
	tcf_unregister_action(&act_mpls_ops, &mpls_net_ops);
}

module_init(mpls_init_module);
module_exit(mpls_cleanup_module);

MODULE_SOFTDEP("post: mpls_gso");
MODULE_AUTHOR("Netronome Systems <oss-drivers@netronome.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("MPLS manipulation actions");
Commit	Line	Data
2a2ea508 JH	1	// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
	2	/* Copyright (C) 2019 Netronome Systems, Inc. */
	3
040b5cfb	4	#include <linux/if_arp.h>
2a2ea508 JH	5	#include <linux/init.h>
	6	#include <linux/kernel.h>
	7	#include <linux/module.h>
	8	#include <linux/mpls.h>
	9	#include <linux/rtnetlink.h>
	10	#include <linux/skbuff.h>
	11	#include <linux/tc_act/tc_mpls.h>
	12	#include <net/mpls.h>
	13	#include <net/netlink.h>
	14	#include <net/pkt_sched.h>
	15	#include <net/pkt_cls.h>
	16	#include <net/tc_act/tc_mpls.h>
	17
	18	static unsigned int mpls_net_id;
	19	static struct tc_action_ops act_mpls_ops;
	20
	21	#define ACT_MPLS_TTL_DEFAULT 255
	22
	23	static __be32 tcf_mpls_get_lse(struct mpls_shim_hdr *lse,
	24	struct tcf_mpls_params *p, bool set_bos)
	25	{
	26	u32 new_lse = 0;
	27
	28	if (lse)
	29	new_lse = be32_to_cpu(lse->label_stack_entry);
	30
	31	if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET) {
	32	new_lse &= ~MPLS_LS_LABEL_MASK;
	33	new_lse \|= p->tcfm_label << MPLS_LS_LABEL_SHIFT;
	34	}
	35	if (p->tcfm_ttl) {
	36	new_lse &= ~MPLS_LS_TTL_MASK;
	37	new_lse \|= p->tcfm_ttl << MPLS_LS_TTL_SHIFT;
	38	}
	39	if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET) {
	40	new_lse &= ~MPLS_LS_TC_MASK;
	41	new_lse \|= p->tcfm_tc << MPLS_LS_TC_SHIFT;
	42	}
	43	if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET) {
	44	new_lse &= ~MPLS_LS_S_MASK;
	45	new_lse \|= p->tcfm_bos << MPLS_LS_S_SHIFT;
	46	} else if (set_bos) {
	47	new_lse \|= 1 << MPLS_LS_S_SHIFT;
	48	}
	49
	50	return cpu_to_be32(new_lse);
	51	}
	52
	53	static int tcf_mpls_act(struct sk_buff skb, const struct tc_action a,
	54	struct tcf_result *res)
	55	{
	56	struct tcf_mpls *m = to_mpls(a);
	57	struct tcf_mpls_params *p;
	58	__be32 new_lse;
fa4e0f88	59	int ret, mac_len;
2a2ea508 JH	60
	61	tcf_lastuse_update(&m->tcf_tm);
	62	bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb);
	63
	64	/* Ensure 'data' points at mac_header prior calling mpls manipulating
	65	* functions.
	66	*/
fa4e0f88	67	if (skb_at_tc_ingress(skb)) {
2a2ea508	68	skb_push_rcsum(skb, skb->mac_len);
fa4e0f88 DC	69	mac_len = skb->mac_len;
	70	} else {
	71	mac_len = skb_network_header(skb) - skb_mac_header(skb);
	72	}
2a2ea508 JH	73
	74	ret = READ_ONCE(m->tcf_action);
	75
	76	p = rcu_dereference_bh(m->mpls_p);
	77
	78	switch (p->tcfm_action) {
	79	case TCA_MPLS_ACT_POP:
040b5cfb MV	80	if (skb_mpls_pop(skb, p->tcfm_proto, mac_len,
040b5cfb MV	81	skb->dev && skb->dev->type == ARPHRD_ETHER))
2a2ea508 JH	82	goto drop;
	83	break;
	84	case TCA_MPLS_ACT_PUSH:
d7bf2ebe	85	new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb_protocol(skb, true)));
d04ac224 MV	86	if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len,
d04ac224 MV	87	skb->dev && skb->dev->type == ARPHRD_ETHER))
2a2ea508 JH	88	goto drop;
2a2ea508 JH	89	break;
a45294af GN	90	case TCA_MPLS_ACT_MAC_PUSH:
	91	if (skb_vlan_tag_present(skb)) {
	92	if (__vlan_insert_inner_tag(skb, skb->vlan_proto,
	93	skb_vlan_tag_get(skb),
	94	ETH_HLEN) < 0)
	95	goto drop;
	96
	97	skb->protocol = skb->vlan_proto;
	98	__vlan_hwaccel_clear_tag(skb);
	99	}
	100
	101	new_lse = tcf_mpls_get_lse(NULL, p, mac_len \|\|
	102	!eth_p_mpls(skb->protocol));
	103
	104	if (skb_mpls_push(skb, new_lse, p->tcfm_proto, 0, false))
	105	goto drop;
	106	break;
2a2ea508	107	case TCA_MPLS_ACT_MODIFY:
9608fa65 DC	108	if (!pskb_may_pull(skb,
	109	skb_network_offset(skb) + MPLS_HLEN))
	110	goto drop;
2a2ea508 JH	111	new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false);
	112	if (skb_mpls_update_lse(skb, new_lse))
	113	goto drop;
	114	break;
	115	case TCA_MPLS_ACT_DEC_TTL:
	116	if (skb_mpls_dec_ttl(skb))
	117	goto drop;
	118	break;
	119	}
	120
	121	if (skb_at_tc_ingress(skb))
	122	skb_pull_rcsum(skb, skb->mac_len);
	123
	124	return ret;
	125
	126	drop:
	127	qstats_drop_inc(this_cpu_ptr(m->common.cpu_qstats));
	128	return TC_ACT_SHOT;
	129	}
	130
	131	static int valid_label(const struct nlattr *attr,
	132	struct netlink_ext_ack *extack)
	133	{
	134	const u32 *label = nla_data(attr);
	135
	136	if (label & ~MPLS_LABEL_MASK \|\| label == MPLS_LABEL_IMPLNULL) {
	137	NL_SET_ERR_MSG_MOD(extack, "MPLS label out of range");
	138	return -EINVAL;
	139	}
	140
	141	return 0;
	142	}
	143
	144	static const struct nla_policy mpls_policy[TCA_MPLS_MAX + 1] = {
2a2ea508 JH	145	[TCA_MPLS_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_mpls)),
	146	[TCA_MPLS_PROTO] = { .type = NLA_U16 },
	147	[TCA_MPLS_LABEL] = NLA_POLICY_VALIDATE_FN(NLA_U32, valid_label),
	148	[TCA_MPLS_TC] = NLA_POLICY_RANGE(NLA_U8, 0, 7),
	149	[TCA_MPLS_TTL] = NLA_POLICY_MIN(NLA_U8, 1),
	150	[TCA_MPLS_BOS] = NLA_POLICY_RANGE(NLA_U8, 0, 1),
	151	};
	152
	153	static int tcf_mpls_init(struct net net, struct nlattr nla,
	154	struct nlattr est, struct tc_action *a,
abbb0d33 VB	155	struct tcf_proto *tp, u32 flags,
abbb0d33 VB	156	struct netlink_ext_ack *extack)
2a2ea508 JH	157	{
2a2ea508 JH	158	struct tc_action_net *tn = net_generic(net, mpls_net_id);
695176bf	159	bool bind = flags & TCA_ACT_FLAGS_BIND;
2a2ea508 JH	160	struct nlattr *tb[TCA_MPLS_MAX + 1];
	161	struct tcf_chain *goto_ch = NULL;
	162	struct tcf_mpls_params *p;
	163	struct tc_mpls *parm;
	164	bool exists = false;
	165	struct tcf_mpls *m;
	166	int ret = 0, err;
	167	u8 mpls_ttl = 0;
7be8ef2c	168	u32 index;
2a2ea508 JH	169
	170	if (!nla) {
	171	NL_SET_ERR_MSG_MOD(extack, "Missing netlink attributes");
	172	return -EINVAL;
	173	}
	174
	175	err = nla_parse_nested(tb, TCA_MPLS_MAX, nla, mpls_policy, extack);
	176	if (err < 0)
	177	return err;
	178
	179	if (!tb[TCA_MPLS_PARMS]) {
	180	NL_SET_ERR_MSG_MOD(extack, "No MPLS params");
	181	return -EINVAL;
	182	}
	183	parm = nla_data(tb[TCA_MPLS_PARMS]);
7be8ef2c	184	index = parm->index;
2a2ea508 JH	185
	186	/* Verify parameters against action type. */
	187	switch (parm->m_action) {
	188	case TCA_MPLS_ACT_POP:
	189	if (!tb[TCA_MPLS_PROTO]) {
	190	NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop");
	191	return -EINVAL;
	192	}
	193	if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
	194	NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop");
	195	return -EINVAL;
	196	}
	197	if (tb[TCA_MPLS_LABEL] \|\| tb[TCA_MPLS_TTL] \|\| tb[TCA_MPLS_TC] \|\|
	198	tb[TCA_MPLS_BOS]) {
	199	NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop");
	200	return -EINVAL;
	201	}
	202	break;
	203	case TCA_MPLS_ACT_DEC_TTL:
	204	if (tb[TCA_MPLS_PROTO] \|\| tb[TCA_MPLS_LABEL] \|\|
	205	tb[TCA_MPLS_TTL] \|\| tb[TCA_MPLS_TC] \|\| tb[TCA_MPLS_BOS]) {
	206	NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl");
	207	return -EINVAL;
	208	}
	209	break;
	210	case TCA_MPLS_ACT_PUSH:
a45294af	211	case TCA_MPLS_ACT_MAC_PUSH:
2a2ea508 JH	212	if (!tb[TCA_MPLS_LABEL]) {
	213	NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push");
	214	return -EINVAL;
	215	}
	216	if (tb[TCA_MPLS_PROTO] &&
	217	!eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
	218	NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push");
	219	return -EPROTONOSUPPORT;
	220	}
	221	/* Push needs a TTL - if not specified, set a default value. */
	222	if (!tb[TCA_MPLS_TTL]) {
	223	#if IS_ENABLED(CONFIG_MPLS)
	224	mpls_ttl = net->mpls.default_ttl ?
	225	net->mpls.default_ttl : ACT_MPLS_TTL_DEFAULT;
	226	#else
	227	mpls_ttl = ACT_MPLS_TTL_DEFAULT;
	228	#endif
	229	}
	230	break;
	231	case TCA_MPLS_ACT_MODIFY:
	232	if (tb[TCA_MPLS_PROTO]) {
	233	NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify");
	234	return -EINVAL;
	235	}
	236	break;
	237	default:
	238	NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action");
	239	return -EINVAL;
	240	}
	241
7be8ef2c	242	err = tcf_idr_check_alloc(tn, &index, a, bind);
2a2ea508 JH	243	if (err < 0)
	244	return err;
	245	exists = err;
	246	if (exists && bind)
	247	return 0;
	248
	249	if (!exists) {
7be8ef2c	250	ret = tcf_idr_create(tn, index, est, a,
e3822678	251	&act_mpls_ops, bind, true, 0);
2a2ea508	252	if (ret) {
7be8ef2c	253	tcf_idr_cleanup(tn, index);
2a2ea508 JH	254	return ret;
	255	}
	256
	257	ret = ACT_P_CREATED;
695176bf	258	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
2a2ea508 JH	259	tcf_idr_release(*a, bind);
	260	return -EEXIST;
	261	}
	262
	263	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	264	if (err < 0)
	265	goto release_idr;
	266
	267	m = to_mpls(*a);
	268
	269	p = kzalloc(sizeof(*p), GFP_KERNEL);
	270	if (!p) {
	271	err = -ENOMEM;
	272	goto put_chain;
	273	}
	274
	275	p->tcfm_action = parm->m_action;
	276	p->tcfm_label = tb[TCA_MPLS_LABEL] ? nla_get_u32(tb[TCA_MPLS_LABEL]) :
	277	ACT_MPLS_LABEL_NOT_SET;
	278	p->tcfm_tc = tb[TCA_MPLS_TC] ? nla_get_u8(tb[TCA_MPLS_TC]) :
	279	ACT_MPLS_TC_NOT_SET;
	280	p->tcfm_ttl = tb[TCA_MPLS_TTL] ? nla_get_u8(tb[TCA_MPLS_TTL]) :
	281	mpls_ttl;
	282	p->tcfm_bos = tb[TCA_MPLS_BOS] ? nla_get_u8(tb[TCA_MPLS_BOS]) :
	283	ACT_MPLS_BOS_NOT_SET;
	284	p->tcfm_proto = tb[TCA_MPLS_PROTO] ? nla_get_be16(tb[TCA_MPLS_PROTO]) :
	285	htons(ETH_P_MPLS_UC);
	286
	287	spin_lock_bh(&m->tcf_lock);
	288	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
445d3749	289	p = rcu_replace_pointer(m->mpls_p, p, lockdep_is_held(&m->tcf_lock));
2a2ea508 JH	290	spin_unlock_bh(&m->tcf_lock);
	291
	292	if (goto_ch)
	293	tcf_chain_put_by_act(goto_ch);
	294	if (p)
	295	kfree_rcu(p, rcu);
	296
2a2ea508 JH	297	return ret;
	298	put_chain:
	299	if (goto_ch)
	300	tcf_chain_put_by_act(goto_ch);
	301	release_idr:
	302	tcf_idr_release(*a, bind);
	303	return err;
	304	}
	305
	306	static void tcf_mpls_cleanup(struct tc_action *a)
	307	{
	308	struct tcf_mpls *m = to_mpls(a);
	309	struct tcf_mpls_params *p;
	310
	311	p = rcu_dereference_protected(m->mpls_p, 1);
	312	if (p)
	313	kfree_rcu(p, rcu);
	314	}
	315
	316	static int tcf_mpls_dump(struct sk_buff skb, struct tc_action a,
	317	int bind, int ref)
	318	{
	319	unsigned char *b = skb_tail_pointer(skb);
	320	struct tcf_mpls *m = to_mpls(a);
	321	struct tcf_mpls_params *p;
	322	struct tc_mpls opt = {
	323	.index = m->tcf_index,
	324	.refcnt = refcount_read(&m->tcf_refcnt) - ref,
	325	.bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
	326	};
	327	struct tcf_t t;
	328
	329	spin_lock_bh(&m->tcf_lock);
	330	opt.action = m->tcf_action;
	331	p = rcu_dereference_protected(m->mpls_p, lockdep_is_held(&m->tcf_lock));
	332	opt.m_action = p->tcfm_action;
	333
	334	if (nla_put(skb, TCA_MPLS_PARMS, sizeof(opt), &opt))
	335	goto nla_put_failure;
	336
	337	if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET &&
	338	nla_put_u32(skb, TCA_MPLS_LABEL, p->tcfm_label))
	339	goto nla_put_failure;
	340
	341	if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET &&
	342	nla_put_u8(skb, TCA_MPLS_TC, p->tcfm_tc))
	343	goto nla_put_failure;
	344
	345	if (p->tcfm_ttl && nla_put_u8(skb, TCA_MPLS_TTL, p->tcfm_ttl))
	346	goto nla_put_failure;
	347
	348	if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET &&
	349	nla_put_u8(skb, TCA_MPLS_BOS, p->tcfm_bos))
	350	goto nla_put_failure;
	351
	352	if (nla_put_be16(skb, TCA_MPLS_PROTO, p->tcfm_proto))
	353	goto nla_put_failure;
	354
	355	tcf_tm_dump(&t, &m->tcf_tm);
	356
	357	if (nla_put_64bit(skb, TCA_MPLS_TM, sizeof(t), &t, TCA_MPLS_PAD))
	358	goto nla_put_failure;
	359
	360	spin_unlock_bh(&m->tcf_lock);
361
362	return skb->len;
363
364	nla_put_failure:
365	spin_unlock_bh(&m->tcf_lock);
366	nlmsg_trim(skb, b);
367	return -EMSGSIZE;
368	}
369
370	static int tcf_mpls_walker(struct net net, struct sk_buff skb,
371	struct netlink_callback *cb, int type,
372	const struct tc_action_ops *ops,
373	struct netlink_ext_ack *extack)
374	{
375	struct tc_action_net *tn = net_generic(net, mpls_net_id);
376
377	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
378	}
379
380	static int tcf_mpls_search(struct net net, struct tc_action *a, u32 index)
381	{
382	struct tc_action_net *tn = net_generic(net, mpls_net_id);
383
384	return tcf_idr_search(tn, a, index);
385	}
386
387	static struct tc_action_ops act_mpls_ops = {
388	.kind = "mpls",
389	.id = TCA_ID_MPLS,
390	.owner = THIS_MODULE,
391	.act = tcf_mpls_act,
392	.dump = tcf_mpls_dump,
393	.init = tcf_mpls_init,
394	.cleanup = tcf_mpls_cleanup,
395	.walk = tcf_mpls_walker,
396	.lookup = tcf_mpls_search,
397	.size = sizeof(struct tcf_mpls),
398	};
399
400	static __net_init int mpls_init_net(struct net *net)
401	{
402	struct tc_action_net *tn = net_generic(net, mpls_net_id);
403
981471bd	404	return tc_action_net_init(net, tn, &act_mpls_ops);
2a2ea508 JH	405	}
	406
	407	static void __net_exit mpls_exit_net(struct list_head *net_list)
	408	{
	409	tc_action_net_exit(net_list, mpls_net_id);
	410	}
	411
	412	static struct pernet_operations mpls_net_ops = {
	413	.init = mpls_init_net,
	414	.exit_batch = mpls_exit_net,
	415	.id = &mpls_net_id,
	416	.size = sizeof(struct tc_action_net),
	417	};
	418
	419	static int __init mpls_init_module(void)
	420	{
	421	return tcf_register_action(&act_mpls_ops, &mpls_net_ops);
	422	}
	423
	424	static void __exit mpls_cleanup_module(void)
	425	{
	426	tcf_unregister_action(&act_mpls_ops, &mpls_net_ops);
	427	}
	428
	429	module_init(mpls_init_module);
	430	module_exit(mpls_cleanup_module);
	431
501b72ae	432	MODULE_SOFTDEP("post: mpls_gso");
2a2ea508 JH	433	MODULE_AUTHOR("Netronome Systems <oss-drivers@netronome.com>");
	434	MODULE_LICENSE("GPL");
	435	MODULE_DESCRIPTION("MPLS manipulation actions");