[mirror_ubuntu-jammy-kernel.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)
{
	int trailing;
	unsigned int tlv_offset;

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

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

	if (srh->segments_left > srh->first_segment)
		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) {
		if (!hinfo)
			err = -ENOENT;

		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
	seg6_hmac_net_init(net);
#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(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 = -ENOMEM;

	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
6c8702c6 DL	28	bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
	29	{
	30	int trailing;
	31	unsigned int tlv_offset;
	32
	33	if (srh->type != IPV6_SRCRT_TYPE_4)
	34	return false;
	35
	36	if (((srh->hdrlen + 1) << 3) != len)
	37	return false;
	38
925615ce	39	if (srh->segments_left > srh->first_segment)
6c8702c6 DL	40	return false;
	41
	42	tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
	43
	44	trailing = len - tlv_offset;
	45	if (trailing < 0)
	46	return false;
	47
	48	while (trailing) {
	49	struct sr6_tlv *tlv;
	50	unsigned int tlv_len;
	51
2f3bb642 DL	52	if (trailing < sizeof(*tlv))
	53	return false;
	54
6c8702c6 DL	55	tlv = (struct sr6_tlv )((unsigned char )srh + tlv_offset);
	56	tlv_len = sizeof(*tlv) + tlv->len;
	57
	58	trailing -= tlv_len;
	59	if (trailing < 0)
	60	return false;
	61
	62	tlv_offset += tlv_len;
	63	}
	64
	65	return true;
	66	}
	67
915d7e5e DL	68	static struct genl_family seg6_genl_family;
	69
	70	static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
	71	[SEG6_ATTR_DST] = { .type = NLA_BINARY,
	72	.len = sizeof(struct in6_addr) },
	73	[SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
	74	[SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
	75	[SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
	76	[SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
	77	[SEG6_ATTR_ALGID] = { .type = NLA_U8, },
	78	[SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
	79	};
	80
4f4853dc DL	81	#ifdef CONFIG_IPV6_SEG6_HMAC
	82
	83	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	84	{
	85	struct net *net = genl_info_net(info);
	86	struct seg6_pernet_data *sdata;
	87	struct seg6_hmac_info *hinfo;
	88	u32 hmackeyid;
	89	char *secret;
	90	int err = 0;
	91	u8 algid;
	92	u8 slen;
	93
	94	sdata = seg6_pernet(net);
	95
	96	if (!info->attrs[SEG6_ATTR_HMACKEYID] \|\|
	97	!info->attrs[SEG6_ATTR_SECRETLEN] \|\|
	98	!info->attrs[SEG6_ATTR_ALGID])
	99	return -EINVAL;
	100
	101	hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
	102	slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
	103	algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
	104
	105	if (hmackeyid == 0)
	106	return -EINVAL;
	107
	108	if (slen > SEG6_HMAC_SECRET_LEN)
	109	return -EINVAL;
	110
	111	mutex_lock(&sdata->lock);
	112	hinfo = seg6_hmac_info_lookup(net, hmackeyid);
	113
	114	if (!slen) {
	115	if (!hinfo)
	116	err = -ENOENT;
	117
	118	err = seg6_hmac_info_del(net, hmackeyid);
	119
	120	goto out_unlock;
	121	}
	122
	123	if (!info->attrs[SEG6_ATTR_SECRET]) {
	124	err = -EINVAL;
	125	goto out_unlock;
	126	}
	127
	128	if (hinfo) {
	129	err = seg6_hmac_info_del(net, hmackeyid);
	130	if (err)
	131	goto out_unlock;
	132	}
	133
	134	secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
	135
	136	hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
	137	if (!hinfo) {
	138	err = -ENOMEM;
	139	goto out_unlock;
	140	}
	141
	142	memcpy(hinfo->secret, secret, slen);
	143	hinfo->slen = slen;
	144	hinfo->alg_id = algid;
145	hinfo->hmackeyid = hmackeyid;
146
147	err = seg6_hmac_info_add(net, hmackeyid, hinfo);
148	if (err)
149	kfree(hinfo);
150
151	out_unlock:
152	mutex_unlock(&sdata->lock);
153	return err;
154	}
155
156	#else
157
915d7e5e DL	158	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	159	{
	160	return -ENOTSUPP;
	161	}
	162
4f4853dc DL	163	#endif
4f4853dc DL	164
915d7e5e DL	165	static int seg6_genl_set_tunsrc(struct sk_buff skb, struct genl_info info)
	166	{
	167	struct net *net = genl_info_net(info);
	168	struct in6_addr val, t_old, *t_new;
	169	struct seg6_pernet_data *sdata;
	170
	171	sdata = seg6_pernet(net);
	172
	173	if (!info->attrs[SEG6_ATTR_DST])
	174	return -EINVAL;
	175
	176	val = nla_data(info->attrs[SEG6_ATTR_DST]);
	177	t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
e363116b ED	178	if (!t_new)
e363116b ED	179	return -ENOMEM;
915d7e5e DL	180
	181	mutex_lock(&sdata->lock);
	182
	183	t_old = sdata->tun_src;
	184	rcu_assign_pointer(sdata->tun_src, t_new);
	185
	186	mutex_unlock(&sdata->lock);
	187
	188	synchronize_net();
	189	kfree(t_old);
	190
	191	return 0;
	192	}
	193
	194	static int seg6_genl_get_tunsrc(struct sk_buff skb, struct genl_info info)
	195	{
	196	struct net *net = genl_info_net(info);
	197	struct in6_addr *tun_src;
	198	struct sk_buff *msg;
	199	void *hdr;
	200
	201	msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	202	if (!msg)
	203	return -ENOMEM;
	204
	205	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	206	&seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
	207	if (!hdr)
	208	goto free_msg;
	209
	210	rcu_read_lock();
	211	tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
	212
	213	if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
	214	goto nla_put_failure;
	215
	216	rcu_read_unlock();
	217
	218	genlmsg_end(msg, hdr);
d1f20798	219	return genlmsg_reply(msg, info);
915d7e5e DL	220
	221	nla_put_failure:
	222	rcu_read_unlock();
915d7e5e DL	223	free_msg:
	224	nlmsg_free(msg);
	225	return -ENOMEM;
	226	}
	227
4f4853dc DL	228	#ifdef CONFIG_IPV6_SEG6_HMAC
	229
	230	static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
	231	struct sk_buff *msg)
	232	{
	233	if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) \|\|
	234	nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) \|\|
	235	nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) \|\|
	236	nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
	237	return -1;
	238
	239	return 0;
	240	}
	241
	242	static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
	243	u32 portid, u32 seq, u32 flags,
	244	struct sk_buff *skb, u8 cmd)
	245	{
	246	void *hdr;
	247
	248	hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
	249	if (!hdr)
	250	return -ENOMEM;
	251
	252	if (__seg6_hmac_fill_info(hinfo, skb) < 0)
	253	goto nla_put_failure;
	254
	255	genlmsg_end(skb, hdr);
	256	return 0;
	257
	258	nla_put_failure:
	259	genlmsg_cancel(skb, hdr);
	260	return -EMSGSIZE;
	261	}
	262
	263	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	264	{
	265	struct net *net = sock_net(cb->skb->sk);
	266	struct seg6_pernet_data *sdata;
	267	struct rhashtable_iter *iter;
	268
	269	sdata = seg6_pernet(net);
	270	iter = (struct rhashtable_iter *)cb->args[0];
	271
	272	if (!iter) {
	273	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
	274	if (!iter)
	275	return -ENOMEM;
	276
	277	cb->args[0] = (long)iter;
	278	}
	279
	280	rhashtable_walk_enter(&sdata->hmac_infos, iter);
	281
	282	return 0;
	283	}
	284
	285	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	286	{
	287	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
	288
	289	rhashtable_walk_exit(iter);
	290
	291	kfree(iter);
292
293	return 0;
294	}
295
296	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
297	{
298	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
4f4853dc DL	299	struct seg6_hmac_info *hinfo;
	300	int ret;
	301
97a6ec4a	302	rhashtable_walk_start(iter);
4f4853dc DL	303
	304	for (;;) {
	305	hinfo = rhashtable_walk_next(iter);
	306
	307	if (IS_ERR(hinfo)) {
	308	if (PTR_ERR(hinfo) == -EAGAIN)
	309	continue;
	310	ret = PTR_ERR(hinfo);
	311	goto done;
	312	} else if (!hinfo) {
	313	break;
	314	}
	315
	316	ret = __seg6_genl_dumphmac_element(hinfo,
	317	NETLINK_CB(cb->skb).portid,
	318	cb->nlh->nlmsg_seq,
	319	NLM_F_MULTI,
	320	skb, SEG6_CMD_DUMPHMAC);
	321	if (ret)
	322	goto done;
	323	}
	324
	325	ret = skb->len;
	326
	327	done:
	328	rhashtable_walk_stop(iter);
	329	return ret;
	330	}
	331
	332	#else
	333
	334	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	335	{
	336	return 0;
	337	}
	338
	339	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	340	{
	341	return 0;
	342	}
	343
915d7e5e DL	344	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
	345	{
	346	return -ENOTSUPP;
	347	}
	348
4f4853dc DL	349	#endif
4f4853dc DL	350
915d7e5e DL	351	static int __net_init seg6_net_init(struct net *net)
	352	{
	353	struct seg6_pernet_data *sdata;
	354
	355	sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
	356	if (!sdata)
	357	return -ENOMEM;
	358
	359	mutex_init(&sdata->lock);
	360
	361	sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
	362	if (!sdata->tun_src) {
	363	kfree(sdata);
	364	return -ENOMEM;
	365	}
	366
	367	net->ipv6.seg6_data = sdata;
	368
4f4853dc DL	369	#ifdef CONFIG_IPV6_SEG6_HMAC
	370	seg6_hmac_net_init(net);
	371	#endif
	372
915d7e5e DL	373	return 0;
	374	}
	375
	376	static void __net_exit seg6_net_exit(struct net *net)
	377	{
	378	struct seg6_pernet_data *sdata = seg6_pernet(net);
	379
4f4853dc DL	380	#ifdef CONFIG_IPV6_SEG6_HMAC
	381	seg6_hmac_net_exit(net);
	382	#endif
	383
915d7e5e DL	384	kfree(sdata->tun_src);
	385	kfree(sdata);
	386	}
	387
	388	static struct pernet_operations ip6_segments_ops = {
	389	.init = seg6_net_init,
	390	.exit = seg6_net_exit,
	391	};
	392
	393	static const struct genl_ops seg6_genl_ops[] = {
	394	{
	395	.cmd = SEG6_CMD_SETHMAC,
ef6243ac	396	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	397	.doit = seg6_genl_sethmac,
915d7e5e DL	398	.flags = GENL_ADMIN_PERM,
	399	},
	400	{
	401	.cmd = SEG6_CMD_DUMPHMAC,
ef6243ac	402	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
4f4853dc	403	.start = seg6_genl_dumphmac_start,
915d7e5e	404	.dumpit = seg6_genl_dumphmac,
4f4853dc	405	.done = seg6_genl_dumphmac_done,
915d7e5e DL	406	.flags = GENL_ADMIN_PERM,
	407	},
	408	{
	409	.cmd = SEG6_CMD_SET_TUNSRC,
ef6243ac	410	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	411	.doit = seg6_genl_set_tunsrc,
915d7e5e DL	412	.flags = GENL_ADMIN_PERM,
	413	},
	414	{
	415	.cmd = SEG6_CMD_GET_TUNSRC,
ef6243ac	416	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	417	.doit = seg6_genl_get_tunsrc,
915d7e5e DL	418	.flags = GENL_ADMIN_PERM,
	419	},
	420	};
	421
	422	static struct genl_family seg6_genl_family __ro_after_init = {
	423	.hdrsize = 0,
	424	.name = SEG6_GENL_NAME,
	425	.version = SEG6_GENL_VERSION,
	426	.maxattr = SEG6_ATTR_MAX,
3b0f31f2	427	.policy = seg6_genl_policy,
915d7e5e DL	428	.netnsok = true,
	429	.parallel_ops = true,
	430	.ops = seg6_genl_ops,
	431	.n_ops = ARRAY_SIZE(seg6_genl_ops),
	432	.module = THIS_MODULE,
	433	};
	434
	435	int __init seg6_init(void)
	436	{
	437	int err = -ENOMEM;
	438
	439	err = genl_register_family(&seg6_genl_family);
	440	if (err)
	441	goto out;
	442
	443	err = register_pernet_subsys(&ip6_segments_ops);
	444	if (err)
	445	goto out_unregister_genl;
	446
46738b13	447	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	448	err = seg6_iptunnel_init();
	449	if (err)
	450	goto out_unregister_pernet;
d1df6fd8 DL	451
	452	err = seg6_local_init();
	453	if (err)
	454	goto out_unregister_pernet;
46738b13	455	#endif
6c8702c6	456
4f4853dc DL	457	#ifdef CONFIG_IPV6_SEG6_HMAC
	458	err = seg6_hmac_init();
	459	if (err)
	460	goto out_unregister_iptun;
	461	#endif
	462
915d7e5e DL	463	pr_info("Segment Routing with IPv6\n");
	464
	465	out:
	466	return err;
4f4853dc DL	467	#ifdef CONFIG_IPV6_SEG6_HMAC
4f4853dc DL	468	out_unregister_iptun:
46738b13	469	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
d1df6fd8	470	seg6_local_exit();
4f4853dc DL	471	seg6_iptunnel_exit();
4f4853dc DL	472	#endif
46738b13 DL	473	#endif
46738b13 DL	474	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	475	out_unregister_pernet:
6c8702c6 DL	476	unregister_pernet_subsys(&ip6_segments_ops);
46738b13	477	#endif
915d7e5e DL	478	out_unregister_genl:
	479	genl_unregister_family(&seg6_genl_family);
	480	goto out;
	481	}
	482
	483	void seg6_exit(void)
	484	{
4f4853dc DL	485	#ifdef CONFIG_IPV6_SEG6_HMAC
	486	seg6_hmac_exit();
	487	#endif
46738b13	488	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6	489	seg6_iptunnel_exit();
46738b13	490	#endif
915d7e5e DL	491	unregister_pernet_subsys(&ip6_segments_ops);
	492	genl_unregister_family(&seg6_genl_family);
	493	}