[linux-block.git] / net / ipv6 / seg6.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  SR-IPv6 implementation
 *
 *  Author:
 *  David Lebrun <david.lebrun@uclouvain.be>
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/slab.h>
#include <linux/rhashtable.h>

#include <net/ipv6.h>
#include <net/protocol.h>

#include <net/seg6.h>
#include <net/genetlink.h>
#include <linux/seg6.h>
#include <linux/seg6_genl.h>
#ifdef CONFIG_IPV6_SEG6_HMAC
#include <net/seg6_hmac.h>
#endif

bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced)
{
	unsigned int tlv_offset;
	int max_last_entry;
	int trailing;

	if (srh->type != IPV6_SRCRT_TYPE_4)
		return false;

	if (((srh->hdrlen + 1) << 3) != len)
		return false;

	if (!reduced && srh->segments_left > srh->first_segment) {
		return false;
	} else {
		max_last_entry = (srh->hdrlen / 2) - 1;

		if (srh->first_segment > max_last_entry)
			return false;

		if (srh->segments_left > srh->first_segment + 1)
			return false;
	}

	tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);

	trailing = len - tlv_offset;
	if (trailing < 0)
		return false;

	while (trailing) {
		struct sr6_tlv *tlv;
		unsigned int tlv_len;

		if (trailing < sizeof(*tlv))
			return false;

		tlv = (struct sr6_tlv *)((unsigned char *)srh + tlv_offset);
		tlv_len = sizeof(*tlv) + tlv->len;

		trailing -= tlv_len;
		if (trailing < 0)
			return false;

		tlv_offset += tlv_len;
	}

	return true;
}

static struct genl_family seg6_genl_family;

static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
	[SEG6_ATTR_DST]				= { .type = NLA_BINARY,
		.len = sizeof(struct in6_addr) },
	[SEG6_ATTR_DSTLEN]			= { .type = NLA_S32, },
	[SEG6_ATTR_HMACKEYID]		= { .type = NLA_U32, },
	[SEG6_ATTR_SECRET]			= { .type = NLA_BINARY, },
	[SEG6_ATTR_SECRETLEN]		= { .type = NLA_U8, },
	[SEG6_ATTR_ALGID]			= { .type = NLA_U8, },
	[SEG6_ATTR_HMACINFO]		= { .type = NLA_NESTED, },
};

#ifdef CONFIG_IPV6_SEG6_HMAC

static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(info);
	struct seg6_pernet_data *sdata;
	struct seg6_hmac_info *hinfo;
	u32 hmackeyid;
	char *secret;
	int err = 0;
	u8 algid;
	u8 slen;

	sdata = seg6_pernet(net);

	if (!info->attrs[SEG6_ATTR_HMACKEYID] ||
	    !info->attrs[SEG6_ATTR_SECRETLEN] ||
	    !info->attrs[SEG6_ATTR_ALGID])
		return -EINVAL;

	hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
	slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
	algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);

	if (hmackeyid == 0)
		return -EINVAL;

	if (slen > SEG6_HMAC_SECRET_LEN)
		return -EINVAL;

	mutex_lock(&sdata->lock);
	hinfo = seg6_hmac_info_lookup(net, hmackeyid);

	if (!slen) {
		err = seg6_hmac_info_del(net, hmackeyid);

		goto out_unlock;
	}

	if (!info->attrs[SEG6_ATTR_SECRET]) {
		err = -EINVAL;
		goto out_unlock;
	}

	if (hinfo) {
		err = seg6_hmac_info_del(net, hmackeyid);
		if (err)
			goto out_unlock;
	}

	secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);

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

	memcpy(hinfo->secret, secret, slen);
	hinfo->slen = slen;
	hinfo->alg_id = algid;
	hinfo->hmackeyid = hmackeyid;

	err = seg6_hmac_info_add(net, hmackeyid, hinfo);
	if (err)
		kfree(hinfo);

out_unlock:
	mutex_unlock(&sdata->lock);
	return err;
}

#else

static int seg6_genl_sethmac(struct sk_buff *skb, struct genl_info *info)
{
	return -ENOTSUPP;
}

#endif

static int seg6_genl_set_tunsrc(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(info);
	struct in6_addr *val, *t_old, *t_new;
	struct seg6_pernet_data *sdata;

	sdata = seg6_pernet(net);

	if (!info->attrs[SEG6_ATTR_DST])
		return -EINVAL;

	val = nla_data(info->attrs[SEG6_ATTR_DST]);
	t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
	if (!t_new)
		return -ENOMEM;

	mutex_lock(&sdata->lock);

	t_old = sdata->tun_src;
	rcu_assign_pointer(sdata->tun_src, t_new);

	mutex_unlock(&sdata->lock);

	synchronize_net();
	kfree(t_old);

	return 0;
}

static int seg6_genl_get_tunsrc(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(info);
	struct in6_addr *tun_src;
	struct sk_buff *msg;
	void *hdr;

	msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
			  &seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
	if (!hdr)
		goto free_msg;

	rcu_read_lock();
	tun_src = rcu_dereference(seg6_pernet(net)->tun_src);

	if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
		goto nla_put_failure;

	rcu_read_unlock();

	genlmsg_end(msg, hdr);
	return genlmsg_reply(msg, info);

nla_put_failure:
	rcu_read_unlock();
free_msg:
	nlmsg_free(msg);
	return -ENOMEM;
}

#ifdef CONFIG_IPV6_SEG6_HMAC

static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
				 struct sk_buff *msg)
{
	if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) ||
	    nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) ||
	    nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) ||
	    nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
		return -1;

	return 0;
}

static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
					u32 portid, u32 seq, u32 flags,
					struct sk_buff *skb, u8 cmd)
{
	void *hdr;

	hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
	if (!hdr)
		return -ENOMEM;

	if (__seg6_hmac_fill_info(hinfo, skb) < 0)
		goto nla_put_failure;

	genlmsg_end(skb, hdr);
	return 0;

nla_put_failure:
	genlmsg_cancel(skb, hdr);
	return -EMSGSIZE;
}

static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
{
	struct net *net = sock_net(cb->skb->sk);
	struct seg6_pernet_data *sdata;
	struct rhashtable_iter *iter;

	sdata = seg6_pernet(net);
	iter = (struct rhashtable_iter *)cb->args[0];

	if (!iter) {
		iter = kmalloc(sizeof(*iter), GFP_KERNEL);
		if (!iter)
			return -ENOMEM;

		cb->args[0] = (long)iter;
	}

	rhashtable_walk_enter(&sdata->hmac_infos, iter);

	return 0;
}

static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
{
	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];

	rhashtable_walk_exit(iter);

	kfree(iter);

	return 0;
}

static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct rhashtable_iter *iter = (struct rhashtable_iter *)cb->args[0];
	struct seg6_hmac_info *hinfo;
	int ret;

	rhashtable_walk_start(iter);

	for (;;) {
		hinfo = rhashtable_walk_next(iter);

		if (IS_ERR(hinfo)) {
			if (PTR_ERR(hinfo) == -EAGAIN)
				continue;
			ret = PTR_ERR(hinfo);
			goto done;
		} else if (!hinfo) {
			break;
		}

		ret = __seg6_genl_dumphmac_element(hinfo,
						   NETLINK_CB(cb->skb).portid,
						   cb->nlh->nlmsg_seq,
						   NLM_F_MULTI,
						   skb, SEG6_CMD_DUMPHMAC);
		if (ret)
			goto done;
	}

	ret = skb->len;

done:
	rhashtable_walk_stop(iter);
	return ret;
}

#else

static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
{
	return 0;
}

static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
{
	return 0;
}

static int seg6_genl_dumphmac(struct sk_buff *skb, struct netlink_callback *cb)
{
	return -ENOTSUPP;
}

#endif

static int __net_init seg6_net_init(struct net *net)
{
	struct seg6_pernet_data *sdata;

	sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
	if (!sdata)
		return -ENOMEM;

	mutex_init(&sdata->lock);

	sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
	if (!sdata->tun_src) {
		kfree(sdata);
		return -ENOMEM;
	}

	net->ipv6.seg6_data = sdata;

#ifdef CONFIG_IPV6_SEG6_HMAC
	if (seg6_hmac_net_init(net)) {
		kfree(rcu_dereference_raw(sdata->tun_src));
		kfree(sdata);
		return -ENOMEM;
	}
#endif

	return 0;
}

static void __net_exit seg6_net_exit(struct net *net)
{
	struct seg6_pernet_data *sdata = seg6_pernet(net);

#ifdef CONFIG_IPV6_SEG6_HMAC
	seg6_hmac_net_exit(net);
#endif

	kfree(rcu_dereference_raw(sdata->tun_src));
	kfree(sdata);
}

static struct pernet_operations ip6_segments_ops = {
	.init = seg6_net_init,
	.exit = seg6_net_exit,
};

static const struct genl_ops seg6_genl_ops[] = {
	{
		.cmd	= SEG6_CMD_SETHMAC,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit	= seg6_genl_sethmac,
		.flags	= GENL_ADMIN_PERM,
	},
	{
		.cmd	= SEG6_CMD_DUMPHMAC,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.start	= seg6_genl_dumphmac_start,
		.dumpit	= seg6_genl_dumphmac,
		.done	= seg6_genl_dumphmac_done,
		.flags	= GENL_ADMIN_PERM,
	},
	{
		.cmd	= SEG6_CMD_SET_TUNSRC,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit	= seg6_genl_set_tunsrc,
		.flags	= GENL_ADMIN_PERM,
	},
	{
		.cmd	= SEG6_CMD_GET_TUNSRC,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit	= seg6_genl_get_tunsrc,
		.flags	= GENL_ADMIN_PERM,
	},
};

static struct genl_family seg6_genl_family __ro_after_init = {
	.hdrsize	= 0,
	.name		= SEG6_GENL_NAME,
	.version	= SEG6_GENL_VERSION,
	.maxattr	= SEG6_ATTR_MAX,
	.policy = seg6_genl_policy,
	.netnsok	= true,
	.parallel_ops	= true,
	.ops		= seg6_genl_ops,
	.n_ops		= ARRAY_SIZE(seg6_genl_ops),
	.module		= THIS_MODULE,
};

int __init seg6_init(void)
{
	int err;

	err = genl_register_family(&seg6_genl_family);
	if (err)
		goto out;

	err = register_pernet_subsys(&ip6_segments_ops);
	if (err)
		goto out_unregister_genl;

#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
	err = seg6_iptunnel_init();
	if (err)
		goto out_unregister_pernet;

	err = seg6_local_init();
	if (err)
		goto out_unregister_pernet;
#endif

#ifdef CONFIG_IPV6_SEG6_HMAC
	err = seg6_hmac_init();
	if (err)
		goto out_unregister_iptun;
#endif

	pr_info("Segment Routing with IPv6\n");

out:
	return err;
#ifdef CONFIG_IPV6_SEG6_HMAC
out_unregister_iptun:
#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
	seg6_local_exit();
	seg6_iptunnel_exit();
#endif
#endif
#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
out_unregister_pernet:
	unregister_pernet_subsys(&ip6_segments_ops);
#endif
out_unregister_genl:
	genl_unregister_family(&seg6_genl_family);
	goto out;
}

void seg6_exit(void)
{
#ifdef CONFIG_IPV6_SEG6_HMAC
	seg6_hmac_exit();
#endif
#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
	seg6_iptunnel_exit();
#endif
	unregister_pernet_subsys(&ip6_segments_ops);
	genl_unregister_family(&seg6_genl_family);
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
915d7e5e DL	2	/*
	3	* SR-IPv6 implementation
	4	*
	5	* Author:
	6	* David Lebrun <david.lebrun@uclouvain.be>
915d7e5e DL	7	*/
	8
	9	#include <linux/errno.h>
	10	#include <linux/types.h>
	11	#include <linux/socket.h>
	12	#include <linux/net.h>
	13	#include <linux/in6.h>
	14	#include <linux/slab.h>
0eb71a9d	15	#include <linux/rhashtable.h>
915d7e5e DL	16
	17	#include <net/ipv6.h>
	18	#include <net/protocol.h>
	19
	20	#include <net/seg6.h>
	21	#include <net/genetlink.h>
	22	#include <linux/seg6.h>
	23	#include <linux/seg6_genl.h>
4f4853dc DL	24	#ifdef CONFIG_IPV6_SEG6_HMAC
	25	#include <net/seg6_hmac.h>
	26	#endif
915d7e5e	27
bb986a50	28	bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len, bool reduced)
6c8702c6	29	{
6c8702c6	30	unsigned int tlv_offset;
0cb7498f AA	31	int max_last_entry;
0cb7498f AA	32	int trailing;
6c8702c6 DL	33
	34	if (srh->type != IPV6_SRCRT_TYPE_4)
	35	return false;
	36
	37	if (((srh->hdrlen + 1) << 3) != len)
	38	return false;
	39
bb986a50	40	if (!reduced && srh->segments_left > srh->first_segment) {
0cb7498f	41	return false;
bb986a50 AA	42	} else {
bb986a50 AA	43	max_last_entry = (srh->hdrlen / 2) - 1;
0cb7498f	44
bb986a50 AA	45	if (srh->first_segment > max_last_entry)
	46	return false;
	47
	48	if (srh->segments_left > srh->first_segment + 1)
	49	return false;
	50	}
6c8702c6 DL	51
	52	tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
	53
	54	trailing = len - tlv_offset;
	55	if (trailing < 0)
	56	return false;
	57
	58	while (trailing) {
	59	struct sr6_tlv *tlv;
	60	unsigned int tlv_len;
	61
2f3bb642 DL	62	if (trailing < sizeof(*tlv))
	63	return false;
	64
6c8702c6 DL	65	tlv = (struct sr6_tlv )((unsigned char )srh + tlv_offset);
	66	tlv_len = sizeof(*tlv) + tlv->len;
	67
	68	trailing -= tlv_len;
	69	if (trailing < 0)
	70	return false;
	71
	72	tlv_offset += tlv_len;
	73	}
	74
	75	return true;
	76	}
	77
915d7e5e DL	78	static struct genl_family seg6_genl_family;
	79
	80	static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
	81	[SEG6_ATTR_DST] = { .type = NLA_BINARY,
	82	.len = sizeof(struct in6_addr) },
	83	[SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
	84	[SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
	85	[SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
	86	[SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
	87	[SEG6_ATTR_ALGID] = { .type = NLA_U8, },
	88	[SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
	89	};
	90
4f4853dc DL	91	#ifdef CONFIG_IPV6_SEG6_HMAC
	92
	93	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	94	{
	95	struct net *net = genl_info_net(info);
	96	struct seg6_pernet_data *sdata;
	97	struct seg6_hmac_info *hinfo;
	98	u32 hmackeyid;
	99	char *secret;
	100	int err = 0;
	101	u8 algid;
	102	u8 slen;
	103
	104	sdata = seg6_pernet(net);
	105
	106	if (!info->attrs[SEG6_ATTR_HMACKEYID] \|\|
	107	!info->attrs[SEG6_ATTR_SECRETLEN] \|\|
	108	!info->attrs[SEG6_ATTR_ALGID])
	109	return -EINVAL;
	110
	111	hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
	112	slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
	113	algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
	114
	115	if (hmackeyid == 0)
	116	return -EINVAL;
	117
	118	if (slen > SEG6_HMAC_SECRET_LEN)
	119	return -EINVAL;
	120
	121	mutex_lock(&sdata->lock);
	122	hinfo = seg6_hmac_info_lookup(net, hmackeyid);
	123
	124	if (!slen) {
4f4853dc DL	125	err = seg6_hmac_info_del(net, hmackeyid);
	126
	127	goto out_unlock;
	128	}
	129
	130	if (!info->attrs[SEG6_ATTR_SECRET]) {
	131	err = -EINVAL;
	132	goto out_unlock;
	133	}
	134
	135	if (hinfo) {
	136	err = seg6_hmac_info_del(net, hmackeyid);
	137	if (err)
	138	goto out_unlock;
	139	}
	140
	141	secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
	142
	143	hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
	144	if (!hinfo) {
	145	err = -ENOMEM;
	146	goto out_unlock;
	147	}
	148
	149	memcpy(hinfo->secret, secret, slen);
	150	hinfo->slen = slen;
	151	hinfo->alg_id = algid;
	152	hinfo->hmackeyid = hmackeyid;
	153
	154	err = seg6_hmac_info_add(net, hmackeyid, hinfo);
	155	if (err)
	156	kfree(hinfo);
	157
	158	out_unlock:
	159	mutex_unlock(&sdata->lock);
	160	return err;
	161	}
	162
	163	#else
	164
915d7e5e DL	165	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	166	{
	167	return -ENOTSUPP;
	168	}
	169
4f4853dc DL	170	#endif
4f4853dc DL	171
915d7e5e DL	172	static int seg6_genl_set_tunsrc(struct sk_buff skb, struct genl_info info)
	173	{
	174	struct net *net = genl_info_net(info);
	175	struct in6_addr val, t_old, *t_new;
	176	struct seg6_pernet_data *sdata;
	177
	178	sdata = seg6_pernet(net);
	179
	180	if (!info->attrs[SEG6_ATTR_DST])
	181	return -EINVAL;
	182
	183	val = nla_data(info->attrs[SEG6_ATTR_DST]);
	184	t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
e363116b ED	185	if (!t_new)
e363116b ED	186	return -ENOMEM;
915d7e5e DL	187
	188	mutex_lock(&sdata->lock);
	189
	190	t_old = sdata->tun_src;
	191	rcu_assign_pointer(sdata->tun_src, t_new);
	192
	193	mutex_unlock(&sdata->lock);
	194
	195	synchronize_net();
	196	kfree(t_old);
	197
	198	return 0;
	199	}
	200
	201	static int seg6_genl_get_tunsrc(struct sk_buff skb, struct genl_info info)
	202	{
	203	struct net *net = genl_info_net(info);
	204	struct in6_addr *tun_src;
	205	struct sk_buff *msg;
	206	void *hdr;
	207
	208	msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	209	if (!msg)
	210	return -ENOMEM;
	211
	212	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	213	&seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
	214	if (!hdr)
	215	goto free_msg;
	216
	217	rcu_read_lock();
	218	tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
	219
	220	if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
	221	goto nla_put_failure;
	222
	223	rcu_read_unlock();
	224
	225	genlmsg_end(msg, hdr);
d1f20798	226	return genlmsg_reply(msg, info);
915d7e5e DL	227
	228	nla_put_failure:
	229	rcu_read_unlock();
915d7e5e DL	230	free_msg:
	231	nlmsg_free(msg);
	232	return -ENOMEM;
	233	}
	234
4f4853dc DL	235	#ifdef CONFIG_IPV6_SEG6_HMAC
	236
	237	static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
	238	struct sk_buff *msg)
	239	{
	240	if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) \|\|
	241	nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) \|\|
	242	nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) \|\|
	243	nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
	244	return -1;
	245
	246	return 0;
	247	}
	248
	249	static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
	250	u32 portid, u32 seq, u32 flags,
	251	struct sk_buff *skb, u8 cmd)
	252	{
	253	void *hdr;
	254
	255	hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
	256	if (!hdr)
	257	return -ENOMEM;
	258
	259	if (__seg6_hmac_fill_info(hinfo, skb) < 0)
	260	goto nla_put_failure;
	261
	262	genlmsg_end(skb, hdr);
	263	return 0;
	264
	265	nla_put_failure:
	266	genlmsg_cancel(skb, hdr);
	267	return -EMSGSIZE;
	268	}
	269
	270	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	271	{
	272	struct net *net = sock_net(cb->skb->sk);
	273	struct seg6_pernet_data *sdata;
	274	struct rhashtable_iter *iter;
	275
	276	sdata = seg6_pernet(net);
	277	iter = (struct rhashtable_iter *)cb->args[0];
	278
	279	if (!iter) {
	280	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
	281	if (!iter)
	282	return -ENOMEM;
	283
	284	cb->args[0] = (long)iter;
	285	}
	286
	287	rhashtable_walk_enter(&sdata->hmac_infos, iter);
	288
	289	return 0;
	290	}
	291
	292	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	293	{
	294	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
	295
	296	rhashtable_walk_exit(iter);
	297
	298	kfree(iter);
299
300	return 0;
301	}
302
303	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
304	{
305	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
4f4853dc DL	306	struct seg6_hmac_info *hinfo;
	307	int ret;
	308
97a6ec4a	309	rhashtable_walk_start(iter);
4f4853dc DL	310
	311	for (;;) {
	312	hinfo = rhashtable_walk_next(iter);
	313
	314	if (IS_ERR(hinfo)) {
	315	if (PTR_ERR(hinfo) == -EAGAIN)
	316	continue;
	317	ret = PTR_ERR(hinfo);
	318	goto done;
	319	} else if (!hinfo) {
	320	break;
	321	}
	322
	323	ret = __seg6_genl_dumphmac_element(hinfo,
	324	NETLINK_CB(cb->skb).portid,
	325	cb->nlh->nlmsg_seq,
	326	NLM_F_MULTI,
	327	skb, SEG6_CMD_DUMPHMAC);
	328	if (ret)
	329	goto done;
	330	}
	331
	332	ret = skb->len;
	333
	334	done:
	335	rhashtable_walk_stop(iter);
	336	return ret;
	337	}
	338
	339	#else
	340
	341	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	342	{
	343	return 0;
	344	}
	345
	346	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	347	{
	348	return 0;
	349	}
	350
915d7e5e DL	351	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
	352	{
	353	return -ENOTSUPP;
	354	}
	355
4f4853dc DL	356	#endif
4f4853dc DL	357
915d7e5e DL	358	static int __net_init seg6_net_init(struct net *net)
	359	{
	360	struct seg6_pernet_data *sdata;
	361
	362	sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
	363	if (!sdata)
	364	return -ENOMEM;
	365
	366	mutex_init(&sdata->lock);
	367
	368	sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
	369	if (!sdata->tun_src) {
	370	kfree(sdata);
	371	return -ENOMEM;
	372	}
	373
	374	net->ipv6.seg6_data = sdata;
	375
4f4853dc	376	#ifdef CONFIG_IPV6_SEG6_HMAC
f04ed7d2	377	if (seg6_hmac_net_init(net)) {
f04ed7d2	378	kfree(rcu_dereference_raw(sdata->tun_src));
23b08260	379	kfree(sdata);
f04ed7d2	380	return -ENOMEM;
acaea0d5	381	}
4f4853dc DL	382	#endif
4f4853dc DL	383
915d7e5e DL	384	return 0;
	385	}
	386
	387	static void __net_exit seg6_net_exit(struct net *net)
	388	{
	389	struct seg6_pernet_data *sdata = seg6_pernet(net);
	390
4f4853dc DL	391	#ifdef CONFIG_IPV6_SEG6_HMAC
	392	seg6_hmac_net_exit(net);
	393	#endif
	394
f04ed7d2	395	kfree(rcu_dereference_raw(sdata->tun_src));
915d7e5e DL	396	kfree(sdata);
	397	}
	398
	399	static struct pernet_operations ip6_segments_ops = {
	400	.init = seg6_net_init,
	401	.exit = seg6_net_exit,
	402	};
	403
	404	static const struct genl_ops seg6_genl_ops[] = {
	405	{
	406	.cmd = SEG6_CMD_SETHMAC,
ef6243ac	407	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	408	.doit = seg6_genl_sethmac,
915d7e5e DL	409	.flags = GENL_ADMIN_PERM,
	410	},
	411	{
	412	.cmd = SEG6_CMD_DUMPHMAC,
ef6243ac	413	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
4f4853dc	414	.start = seg6_genl_dumphmac_start,
915d7e5e	415	.dumpit = seg6_genl_dumphmac,
4f4853dc	416	.done = seg6_genl_dumphmac_done,
915d7e5e DL	417	.flags = GENL_ADMIN_PERM,
	418	},
	419	{
	420	.cmd = SEG6_CMD_SET_TUNSRC,
ef6243ac	421	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	422	.doit = seg6_genl_set_tunsrc,
915d7e5e DL	423	.flags = GENL_ADMIN_PERM,
	424	},
	425	{
	426	.cmd = SEG6_CMD_GET_TUNSRC,
ef6243ac	427	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	428	.doit = seg6_genl_get_tunsrc,
915d7e5e DL	429	.flags = GENL_ADMIN_PERM,
	430	},
	431	};
	432
	433	static struct genl_family seg6_genl_family __ro_after_init = {
	434	.hdrsize = 0,
	435	.name = SEG6_GENL_NAME,
	436	.version = SEG6_GENL_VERSION,
	437	.maxattr = SEG6_ATTR_MAX,
3b0f31f2	438	.policy = seg6_genl_policy,
915d7e5e DL	439	.netnsok = true,
	440	.parallel_ops = true,
	441	.ops = seg6_genl_ops,
	442	.n_ops = ARRAY_SIZE(seg6_genl_ops),
	443	.module = THIS_MODULE,
	444	};
	445
	446	int __init seg6_init(void)
	447	{
672e2477	448	int err;
915d7e5e DL	449
	450	err = genl_register_family(&seg6_genl_family);
	451	if (err)
	452	goto out;
	453
	454	err = register_pernet_subsys(&ip6_segments_ops);
	455	if (err)
	456	goto out_unregister_genl;
	457
46738b13	458	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	459	err = seg6_iptunnel_init();
	460	if (err)
	461	goto out_unregister_pernet;
d1df6fd8 DL	462
	463	err = seg6_local_init();
	464	if (err)
	465	goto out_unregister_pernet;
46738b13	466	#endif
6c8702c6	467
4f4853dc DL	468	#ifdef CONFIG_IPV6_SEG6_HMAC
	469	err = seg6_hmac_init();
	470	if (err)
	471	goto out_unregister_iptun;
	472	#endif
	473
915d7e5e DL	474	pr_info("Segment Routing with IPv6\n");
	475
	476	out:
	477	return err;
4f4853dc DL	478	#ifdef CONFIG_IPV6_SEG6_HMAC
4f4853dc DL	479	out_unregister_iptun:
46738b13	480	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
d1df6fd8	481	seg6_local_exit();
4f4853dc DL	482	seg6_iptunnel_exit();
4f4853dc DL	483	#endif
46738b13 DL	484	#endif
46738b13 DL	485	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	486	out_unregister_pernet:
6c8702c6 DL	487	unregister_pernet_subsys(&ip6_segments_ops);
46738b13	488	#endif
915d7e5e DL	489	out_unregister_genl:
	490	genl_unregister_family(&seg6_genl_family);
	491	goto out;
	492	}
	493
	494	void seg6_exit(void)
	495	{
4f4853dc DL	496	#ifdef CONFIG_IPV6_SEG6_HMAC
	497	seg6_hmac_exit();
	498	#endif
46738b13	499	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6	500	seg6_iptunnel_exit();
46738b13	501	#endif
915d7e5e DL	502	unregister_pernet_subsys(&ip6_segments_ops);
	503	genl_unregister_family(&seg6_genl_family);
	504	}