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

/*
 *  SR-IPv6 implementation
 *
 *  Author:
 *  David Lebrun <[email protected]>
 *
 *
 *  This program is free software; you can redistribute it and/or
 *	  modify it under the terms of the GNU General Public License
 *	  as published by the Free Software Foundation; either version
 *	  2 of the License, or (at your option) any later version.
 */

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

		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);

	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);
	genlmsg_reply(msg, info);

	return 0;

nla_put_failure:
	rcu_read_unlock();
	genlmsg_cancel(msg, hdr);
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 net *net = sock_net(skb->sk);
	struct seg6_pernet_data *sdata;
	struct seg6_hmac_info *hinfo;
	int ret;

	sdata = seg6_pernet(net);

	ret = rhashtable_walk_start(iter);
	if (ret && ret != -EAGAIN)
		goto done;

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