[linux-block.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>
#include <net/tc_wrapper.h>

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);
}

TC_INDIRECT_SCOPE 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_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_offset(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 (nla_len(attr) != sizeof(*label)) {
		NL_SET_ERR_MSG_MOD(extack, "Invalid MPLS label length");
		return -EINVAL;
	}

	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_BINARY,
							 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, act_mpls_ops.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;

	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, flags);
		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;
	}

	/* 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");
			err = -EINVAL;
			goto release_idr;
		}
		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");
			err = -EINVAL;
			goto release_idr;
		}
		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");
			err = -EINVAL;
			goto release_idr;
		}
		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");
			err = -EINVAL;
			goto release_idr;
		}
		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");
			err = -EINVAL;
			goto release_idr;
		}
		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");
			err = -EPROTONOSUPPORT;
			goto release_idr;
		}
		/* 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");
			err = -EINVAL;
			goto release_idr;
		}
		break;
	default:
		NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action");
		err = -EINVAL;
		goto release_idr;
	}

	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_offload_act_setup(struct tc_action *act, void *entry_data,
				      u32 *index_inc, bool bind,
				      struct netlink_ext_ack *extack)
{
	if (bind) {
		struct flow_action_entry *entry = entry_data;

		switch (tcf_mpls_action(act)) {
		case TCA_MPLS_ACT_PUSH:
			entry->id = FLOW_ACTION_MPLS_PUSH;
			entry->mpls_push.proto = tcf_mpls_proto(act);
			entry->mpls_push.label = tcf_mpls_label(act);
			entry->mpls_push.tc = tcf_mpls_tc(act);
			entry->mpls_push.bos = tcf_mpls_bos(act);
			entry->mpls_push.ttl = tcf_mpls_ttl(act);
			break;
		case TCA_MPLS_ACT_POP:
			entry->id = FLOW_ACTION_MPLS_POP;
			entry->mpls_pop.proto = tcf_mpls_proto(act);
			break;
		case TCA_MPLS_ACT_MODIFY:
			entry->id = FLOW_ACTION_MPLS_MANGLE;
			entry->mpls_mangle.label = tcf_mpls_label(act);
			entry->mpls_mangle.tc = tcf_mpls_tc(act);
			entry->mpls_mangle.bos = tcf_mpls_bos(act);
			entry->mpls_mangle.ttl = tcf_mpls_ttl(act);
			break;
		case TCA_MPLS_ACT_DEC_TTL:
			NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"dec_ttl\" option is used");
			return -EOPNOTSUPP;
		case TCA_MPLS_ACT_MAC_PUSH:
			NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"mac_push\" option is used");
			return -EOPNOTSUPP;
		default:
			NL_SET_ERR_MSG_MOD(extack, "Unsupported MPLS mode offload");
			return -EOPNOTSUPP;
		}
		*index_inc = 1;
	} else {
		struct flow_offload_action *fl_action = entry_data;

		switch (tcf_mpls_action(act)) {
		case TCA_MPLS_ACT_PUSH:
			fl_action->id = FLOW_ACTION_MPLS_PUSH;
			break;
		case TCA_MPLS_ACT_POP:
			fl_action->id = FLOW_ACTION_MPLS_POP;
			break;
		case TCA_MPLS_ACT_MODIFY:
			fl_action->id = FLOW_ACTION_MPLS_MANGLE;
			break;
		default:
			return -EOPNOTSUPP;
		}
	}

	return 0;
}

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,
	.offload_act_setup =	tcf_mpls_offload_act_setup,
	.size		=	sizeof(struct tcf_mpls),
};

static __net_init int mpls_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, act_mpls_ops.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, act_mpls_ops.net_id);
}

static struct pernet_operations mpls_net_ops = {
	.init = mpls_init_net,
	.exit_batch = mpls_exit_net,
	.id   = &act_mpls_ops.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>
871cf386	17	#include <net/tc_wrapper.h>
2a2ea508	18
2a2ea508 JH	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
871cf386 PT	53	TC_INDIRECT_SCOPE int tcf_mpls_act(struct sk_buff *skb,
	54	const struct tc_action *a,
	55	struct tcf_result *res)
2a2ea508 JH	56	{
	57	struct tcf_mpls *m = to_mpls(a);
	58	struct tcf_mpls_params *p;
	59	__be32 new_lse;
fa4e0f88	60	int ret, mac_len;
2a2ea508 JH	61
2a2ea508 JH	62	tcf_lastuse_update(&m->tcf_tm);
50dc9a85	63	bstats_update(this_cpu_ptr(m->common.cpu_bstats), skb);
2a2ea508 JH	64
	65	/* Ensure 'data' points at mac_header prior calling mpls manipulating
	66	* functions.
	67	*/
fa4e0f88	68	if (skb_at_tc_ingress(skb)) {
2a2ea508	69	skb_push_rcsum(skb, skb->mac_len);
fa4e0f88 DC	70	mac_len = skb->mac_len;
fa4e0f88 DC	71	} else {
b3be9488	72	mac_len = skb_network_offset(skb);
fa4e0f88	73	}
2a2ea508 JH	74
	75	ret = READ_ONCE(m->tcf_action);
	76
	77	p = rcu_dereference_bh(m->mpls_p);
	78
	79	switch (p->tcfm_action) {
	80	case TCA_MPLS_ACT_POP:
040b5cfb MV	81	if (skb_mpls_pop(skb, p->tcfm_proto, mac_len,
040b5cfb MV	82	skb->dev && skb->dev->type == ARPHRD_ETHER))
2a2ea508 JH	83	goto drop;
	84	break;
	85	case TCA_MPLS_ACT_PUSH:
d7bf2ebe	86	new_lse = tcf_mpls_get_lse(NULL, p, !eth_p_mpls(skb_protocol(skb, true)));
d04ac224 MV	87	if (skb_mpls_push(skb, new_lse, p->tcfm_proto, mac_len,
d04ac224 MV	88	skb->dev && skb->dev->type == ARPHRD_ETHER))
2a2ea508 JH	89	goto drop;
2a2ea508 JH	90	break;
a45294af GN	91	case TCA_MPLS_ACT_MAC_PUSH:
	92	if (skb_vlan_tag_present(skb)) {
	93	if (__vlan_insert_inner_tag(skb, skb->vlan_proto,
	94	skb_vlan_tag_get(skb),
	95	ETH_HLEN) < 0)
	96	goto drop;
	97
	98	skb->protocol = skb->vlan_proto;
	99	__vlan_hwaccel_clear_tag(skb);
	100	}
	101
	102	new_lse = tcf_mpls_get_lse(NULL, p, mac_len \|\|
	103	!eth_p_mpls(skb->protocol));
	104
	105	if (skb_mpls_push(skb, new_lse, p->tcfm_proto, 0, false))
	106	goto drop;
	107	break;
2a2ea508	108	case TCA_MPLS_ACT_MODIFY:
9608fa65 DC	109	if (!pskb_may_pull(skb,
	110	skb_network_offset(skb) + MPLS_HLEN))
	111	goto drop;
2a2ea508 JH	112	new_lse = tcf_mpls_get_lse(mpls_hdr(skb), p, false);
	113	if (skb_mpls_update_lse(skb, new_lse))
	114	goto drop;
	115	break;
	116	case TCA_MPLS_ACT_DEC_TTL:
	117	if (skb_mpls_dec_ttl(skb))
	118	goto drop;
	119	break;
	120	}
	121
	122	if (skb_at_tc_ingress(skb))
	123	skb_pull_rcsum(skb, skb->mac_len);
	124
	125	return ret;
	126
	127	drop:
	128	qstats_drop_inc(this_cpu_ptr(m->common.cpu_qstats));
	129	return TC_ACT_SHOT;
	130	}
	131
	132	static int valid_label(const struct nlattr *attr,
	133	struct netlink_ext_ack *extack)
	134	{
	135	const u32 *label = nla_data(attr);
	136
9e17f992 IS	137	if (nla_len(attr) != sizeof(*label)) {
	138	NL_SET_ERR_MSG_MOD(extack, "Invalid MPLS label length");
	139	return -EINVAL;
	140	}
	141
2a2ea508 JH	142	if (label & ~MPLS_LABEL_MASK \|\| label == MPLS_LABEL_IMPLNULL) {
	143	NL_SET_ERR_MSG_MOD(extack, "MPLS label out of range");
	144	return -EINVAL;
	145	}
	146
	147	return 0;
	148	}
	149
	150	static const struct nla_policy mpls_policy[TCA_MPLS_MAX + 1] = {
2a2ea508 JH	151	[TCA_MPLS_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_mpls)),
2a2ea508 JH	152	[TCA_MPLS_PROTO] = { .type = NLA_U16 },
9e17f992 IS	153	[TCA_MPLS_LABEL] = NLA_POLICY_VALIDATE_FN(NLA_BINARY,
9e17f992 IS	154	valid_label),
2a2ea508 JH	155	[TCA_MPLS_TC] = NLA_POLICY_RANGE(NLA_U8, 0, 7),
	156	[TCA_MPLS_TTL] = NLA_POLICY_MIN(NLA_U8, 1),
	157	[TCA_MPLS_BOS] = NLA_POLICY_RANGE(NLA_U8, 0, 1),
	158	};
	159
	160	static int tcf_mpls_init(struct net net, struct nlattr nla,
	161	struct nlattr est, struct tc_action *a,
abbb0d33 VB	162	struct tcf_proto *tp, u32 flags,
abbb0d33 VB	163	struct netlink_ext_ack *extack)
2a2ea508	164	{
acd0a7ab	165	struct tc_action_net *tn = net_generic(net, act_mpls_ops.net_id);
695176bf	166	bool bind = flags & TCA_ACT_FLAGS_BIND;
2a2ea508 JH	167	struct nlattr *tb[TCA_MPLS_MAX + 1];
	168	struct tcf_chain *goto_ch = NULL;
	169	struct tcf_mpls_params *p;
	170	struct tc_mpls *parm;
	171	bool exists = false;
	172	struct tcf_mpls *m;
	173	int ret = 0, err;
	174	u8 mpls_ttl = 0;
7be8ef2c	175	u32 index;
2a2ea508 JH	176
	177	if (!nla) {
	178	NL_SET_ERR_MSG_MOD(extack, "Missing netlink attributes");
	179	return -EINVAL;
	180	}
	181
	182	err = nla_parse_nested(tb, TCA_MPLS_MAX, nla, mpls_policy, extack);
	183	if (err < 0)
	184	return err;
	185
	186	if (!tb[TCA_MPLS_PARMS]) {
	187	NL_SET_ERR_MSG_MOD(extack, "No MPLS params");
	188	return -EINVAL;
	189	}
	190	parm = nla_data(tb[TCA_MPLS_PARMS]);
7be8ef2c	191	index = parm->index;
2a2ea508	192
e88d78a7 PT	193	err = tcf_idr_check_alloc(tn, &index, a, bind);
	194	if (err < 0)
	195	return err;
	196	exists = err;
	197	if (exists && bind)
	198	return 0;
	199
	200	if (!exists) {
	201	ret = tcf_idr_create(tn, index, est, a, &act_mpls_ops, bind,
	202	true, flags);
	203	if (ret) {
	204	tcf_idr_cleanup(tn, index);
	205	return ret;
	206	}
	207
	208	ret = ACT_P_CREATED;
	209	} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
	210	tcf_idr_release(*a, bind);
	211	return -EEXIST;
	212	}
	213
2a2ea508 JH	214	/* Verify parameters against action type. */
	215	switch (parm->m_action) {
	216	case TCA_MPLS_ACT_POP:
	217	if (!tb[TCA_MPLS_PROTO]) {
	218	NL_SET_ERR_MSG_MOD(extack, "Protocol must be set for MPLS pop");
e88d78a7 PT	219	err = -EINVAL;
e88d78a7 PT	220	goto release_idr;
2a2ea508 JH	221	}
	222	if (!eth_proto_is_802_3(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
	223	NL_SET_ERR_MSG_MOD(extack, "Invalid protocol type for MPLS pop");
e88d78a7 PT	224	err = -EINVAL;
e88d78a7 PT	225	goto release_idr;
2a2ea508 JH	226	}
	227	if (tb[TCA_MPLS_LABEL] \|\| tb[TCA_MPLS_TTL] \|\| tb[TCA_MPLS_TC] \|\|
	228	tb[TCA_MPLS_BOS]) {
	229	NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC or BOS cannot be used with MPLS pop");
e88d78a7 PT	230	err = -EINVAL;
e88d78a7 PT	231	goto release_idr;
2a2ea508 JH	232	}
	233	break;
	234	case TCA_MPLS_ACT_DEC_TTL:
	235	if (tb[TCA_MPLS_PROTO] \|\| tb[TCA_MPLS_LABEL] \|\|
	236	tb[TCA_MPLS_TTL] \|\| tb[TCA_MPLS_TC] \|\| tb[TCA_MPLS_BOS]) {
	237	NL_SET_ERR_MSG_MOD(extack, "Label, TTL, TC, BOS or protocol cannot be used with MPLS dec_ttl");
e88d78a7 PT	238	err = -EINVAL;
e88d78a7 PT	239	goto release_idr;
2a2ea508 JH	240	}
	241	break;
	242	case TCA_MPLS_ACT_PUSH:
a45294af	243	case TCA_MPLS_ACT_MAC_PUSH:
2a2ea508 JH	244	if (!tb[TCA_MPLS_LABEL]) {
2a2ea508 JH	245	NL_SET_ERR_MSG_MOD(extack, "Label is required for MPLS push");
e88d78a7 PT	246	err = -EINVAL;
e88d78a7 PT	247	goto release_idr;
2a2ea508 JH	248	}
	249	if (tb[TCA_MPLS_PROTO] &&
	250	!eth_p_mpls(nla_get_be16(tb[TCA_MPLS_PROTO]))) {
	251	NL_SET_ERR_MSG_MOD(extack, "Protocol must be an MPLS type for MPLS push");
e88d78a7 PT	252	err = -EPROTONOSUPPORT;
e88d78a7 PT	253	goto release_idr;
2a2ea508 JH	254	}
	255	/* Push needs a TTL - if not specified, set a default value. */
	256	if (!tb[TCA_MPLS_TTL]) {
	257	#if IS_ENABLED(CONFIG_MPLS)
	258	mpls_ttl = net->mpls.default_ttl ?
	259	net->mpls.default_ttl : ACT_MPLS_TTL_DEFAULT;
	260	#else
	261	mpls_ttl = ACT_MPLS_TTL_DEFAULT;
	262	#endif
	263	}
	264	break;
	265	case TCA_MPLS_ACT_MODIFY:
	266	if (tb[TCA_MPLS_PROTO]) {
	267	NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be used with MPLS modify");
e88d78a7 PT	268	err = -EINVAL;
e88d78a7 PT	269	goto release_idr;
2a2ea508 JH	270	}
	271	break;
	272	default:
	273	NL_SET_ERR_MSG_MOD(extack, "Unknown MPLS action");
e88d78a7 PT	274	err = -EINVAL;
e88d78a7 PT	275	goto release_idr;
2a2ea508 JH	276	}
	277
	278	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	279	if (err < 0)
	280	goto release_idr;
	281
	282	m = to_mpls(*a);
	283
	284	p = kzalloc(sizeof(*p), GFP_KERNEL);
	285	if (!p) {
	286	err = -ENOMEM;
	287	goto put_chain;
	288	}
	289
	290	p->tcfm_action = parm->m_action;
	291	p->tcfm_label = tb[TCA_MPLS_LABEL] ? nla_get_u32(tb[TCA_MPLS_LABEL]) :
	292	ACT_MPLS_LABEL_NOT_SET;
	293	p->tcfm_tc = tb[TCA_MPLS_TC] ? nla_get_u8(tb[TCA_MPLS_TC]) :
	294	ACT_MPLS_TC_NOT_SET;
	295	p->tcfm_ttl = tb[TCA_MPLS_TTL] ? nla_get_u8(tb[TCA_MPLS_TTL]) :
	296	mpls_ttl;
	297	p->tcfm_bos = tb[TCA_MPLS_BOS] ? nla_get_u8(tb[TCA_MPLS_BOS]) :
	298	ACT_MPLS_BOS_NOT_SET;
	299	p->tcfm_proto = tb[TCA_MPLS_PROTO] ? nla_get_be16(tb[TCA_MPLS_PROTO]) :
	300	htons(ETH_P_MPLS_UC);
	301
	302	spin_lock_bh(&m->tcf_lock);
	303	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
445d3749	304	p = rcu_replace_pointer(m->mpls_p, p, lockdep_is_held(&m->tcf_lock));
2a2ea508 JH	305	spin_unlock_bh(&m->tcf_lock);
	306
	307	if (goto_ch)
	308	tcf_chain_put_by_act(goto_ch);
	309	if (p)
	310	kfree_rcu(p, rcu);
	311
2a2ea508 JH	312	return ret;
	313	put_chain:
	314	if (goto_ch)
	315	tcf_chain_put_by_act(goto_ch);
	316	release_idr:
	317	tcf_idr_release(*a, bind);
	318	return err;
	319	}
	320
	321	static void tcf_mpls_cleanup(struct tc_action *a)
	322	{
	323	struct tcf_mpls *m = to_mpls(a);
	324	struct tcf_mpls_params *p;
	325
	326	p = rcu_dereference_protected(m->mpls_p, 1);
	327	if (p)
	328	kfree_rcu(p, rcu);
	329	}
	330
	331	static int tcf_mpls_dump(struct sk_buff skb, struct tc_action a,
	332	int bind, int ref)
	333	{
	334	unsigned char *b = skb_tail_pointer(skb);
	335	struct tcf_mpls *m = to_mpls(a);
	336	struct tcf_mpls_params *p;
	337	struct tc_mpls opt = {
	338	.index = m->tcf_index,
	339	.refcnt = refcount_read(&m->tcf_refcnt) - ref,
	340	.bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
	341	};
	342	struct tcf_t t;
	343
	344	spin_lock_bh(&m->tcf_lock);
	345	opt.action = m->tcf_action;
	346	p = rcu_dereference_protected(m->mpls_p, lockdep_is_held(&m->tcf_lock));
	347	opt.m_action = p->tcfm_action;
	348
	349	if (nla_put(skb, TCA_MPLS_PARMS, sizeof(opt), &opt))
	350	goto nla_put_failure;
	351
	352	if (p->tcfm_label != ACT_MPLS_LABEL_NOT_SET &&
	353	nla_put_u32(skb, TCA_MPLS_LABEL, p->tcfm_label))
	354	goto nla_put_failure;
	355
	356	if (p->tcfm_tc != ACT_MPLS_TC_NOT_SET &&
	357	nla_put_u8(skb, TCA_MPLS_TC, p->tcfm_tc))
	358	goto nla_put_failure;
	359
	360	if (p->tcfm_ttl && nla_put_u8(skb, TCA_MPLS_TTL, p->tcfm_ttl))
	361	goto nla_put_failure;
	362
	363	if (p->tcfm_bos != ACT_MPLS_BOS_NOT_SET &&
	364	nla_put_u8(skb, TCA_MPLS_BOS, p->tcfm_bos))
	365	goto nla_put_failure;
	366
	367	if (nla_put_be16(skb, TCA_MPLS_PROTO, p->tcfm_proto))
	368	goto nla_put_failure;
	369
	370	tcf_tm_dump(&t, &m->tcf_tm);
	371
	372	if (nla_put_64bit(skb, TCA_MPLS_TM, sizeof(t), &t, TCA_MPLS_PAD))
	373	goto nla_put_failure;
	374
	375	spin_unlock_bh(&m->tcf_lock);
376
377	return skb->len;
378
379	nla_put_failure:
380	spin_unlock_bh(&m->tcf_lock);
381	nlmsg_trim(skb, b);
382	return -EMSGSIZE;
383	}
384
c54e1d92	385	static int tcf_mpls_offload_act_setup(struct tc_action act, void entry_data,
c2ccf84e IS	386	u32 *index_inc, bool bind,
c2ccf84e IS	387	struct netlink_ext_ack *extack)
c54e1d92 BZ	388	{
	389	if (bind) {
	390	struct flow_action_entry *entry = entry_data;
	391
	392	switch (tcf_mpls_action(act)) {
	393	case TCA_MPLS_ACT_PUSH:
	394	entry->id = FLOW_ACTION_MPLS_PUSH;
	395	entry->mpls_push.proto = tcf_mpls_proto(act);
	396	entry->mpls_push.label = tcf_mpls_label(act);
	397	entry->mpls_push.tc = tcf_mpls_tc(act);
	398	entry->mpls_push.bos = tcf_mpls_bos(act);
	399	entry->mpls_push.ttl = tcf_mpls_ttl(act);
	400	break;
	401	case TCA_MPLS_ACT_POP:
	402	entry->id = FLOW_ACTION_MPLS_POP;
	403	entry->mpls_pop.proto = tcf_mpls_proto(act);
	404	break;
	405	case TCA_MPLS_ACT_MODIFY:
	406	entry->id = FLOW_ACTION_MPLS_MANGLE;
	407	entry->mpls_mangle.label = tcf_mpls_label(act);
	408	entry->mpls_mangle.tc = tcf_mpls_tc(act);
	409	entry->mpls_mangle.bos = tcf_mpls_bos(act);
	410	entry->mpls_mangle.ttl = tcf_mpls_ttl(act);
	411	break;
bca3821d IS	412	case TCA_MPLS_ACT_DEC_TTL:
	413	NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"dec_ttl\" option is used");
	414	return -EOPNOTSUPP;
	415	case TCA_MPLS_ACT_MAC_PUSH:
	416	NL_SET_ERR_MSG_MOD(extack, "Offload not supported when \"mac_push\" option is used");
	417	return -EOPNOTSUPP;
c54e1d92	418	default:
bca3821d	419	NL_SET_ERR_MSG_MOD(extack, "Unsupported MPLS mode offload");
c54e1d92 BZ	420	return -EOPNOTSUPP;
	421	}
	422	*index_inc = 1;
	423	} else {
8cbfe939 BZ	424	struct flow_offload_action *fl_action = entry_data;
	425
	426	switch (tcf_mpls_action(act)) {
	427	case TCA_MPLS_ACT_PUSH:
	428	fl_action->id = FLOW_ACTION_MPLS_PUSH;
	429	break;
	430	case TCA_MPLS_ACT_POP:
	431	fl_action->id = FLOW_ACTION_MPLS_POP;
	432	break;
	433	case TCA_MPLS_ACT_MODIFY:
	434	fl_action->id = FLOW_ACTION_MPLS_MANGLE;
	435	break;
	436	default:
	437	return -EOPNOTSUPP;
	438	}
c54e1d92 BZ	439	}
	440
	441	return 0;
	442	}
	443
2a2ea508 JH	444	static struct tc_action_ops act_mpls_ops = {
	445	.kind = "mpls",
	446	.id = TCA_ID_MPLS,
	447	.owner = THIS_MODULE,
	448	.act = tcf_mpls_act,
	449	.dump = tcf_mpls_dump,
	450	.init = tcf_mpls_init,
	451	.cleanup = tcf_mpls_cleanup,
c54e1d92	452	.offload_act_setup = tcf_mpls_offload_act_setup,
2a2ea508 JH	453	.size = sizeof(struct tcf_mpls),
	454	};
	455
	456	static __net_init int mpls_init_net(struct net *net)
	457	{
acd0a7ab	458	struct tc_action_net *tn = net_generic(net, act_mpls_ops.net_id);
2a2ea508	459
981471bd	460	return tc_action_net_init(net, tn, &act_mpls_ops);
2a2ea508 JH	461	}
	462
	463	static void __net_exit mpls_exit_net(struct list_head *net_list)
	464	{
acd0a7ab	465	tc_action_net_exit(net_list, act_mpls_ops.net_id);
2a2ea508 JH	466	}
	467
	468	static struct pernet_operations mpls_net_ops = {
	469	.init = mpls_init_net,
	470	.exit_batch = mpls_exit_net,
acd0a7ab	471	.id = &act_mpls_ops.net_id,
2a2ea508 JH	472	.size = sizeof(struct tc_action_net),
	473	};
	474
	475	static int __init mpls_init_module(void)
	476	{
	477	return tcf_register_action(&act_mpls_ops, &mpls_net_ops);
	478	}
	479
	480	static void __exit mpls_cleanup_module(void)
	481	{
	482	tcf_unregister_action(&act_mpls_ops, &mpls_net_ops);
	483	}
	484
	485	module_init(mpls_init_module);
	486	module_exit(mpls_cleanup_module);
	487
501b72ae	488	MODULE_SOFTDEP("post: mpls_gso");
2a2ea508 JH	489	MODULE_AUTHOR("Netronome Systems <oss-drivers@netronome.com>");
	490	MODULE_LICENSE("GPL");
	491	MODULE_DESCRIPTION("MPLS manipulation actions");