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

/*
 *  SR-IPv6 implementation
 *
 *  Author:
 *  David Lebrun <david.lebrun@uclouvain.be>
 *
 *
 *  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 <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,
		.doit	= seg6_genl_sethmac,
		.flags	= GENL_ADMIN_PERM,
	},
	{
		.cmd	= SEG6_CMD_DUMPHMAC,
		.start	= seg6_genl_dumphmac_start,
		.dumpit	= seg6_genl_dumphmac,
		.done	= seg6_genl_dumphmac_done,
		.flags	= GENL_ADMIN_PERM,
	},
	{
		.cmd	= SEG6_CMD_SET_TUNSRC,
		.doit	= seg6_genl_set_tunsrc,
		.flags	= GENL_ADMIN_PERM,
	},
	{
		.cmd	= SEG6_CMD_GET_TUNSRC,
		.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
915d7e5e DL	1	/*
	2	* SR-IPv6 implementation
	3	*
	4	* Author:
	5	* David Lebrun <david.lebrun@uclouvain.be>
	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>
0eb71a9d	20	#include <linux/rhashtable.h>
915d7e5e DL	21
	22	#include <net/ipv6.h>
	23	#include <net/protocol.h>
	24
	25	#include <net/seg6.h>
	26	#include <net/genetlink.h>
	27	#include <linux/seg6.h>
	28	#include <linux/seg6_genl.h>
4f4853dc DL	29	#ifdef CONFIG_IPV6_SEG6_HMAC
	30	#include <net/seg6_hmac.h>
	31	#endif
915d7e5e	32
6c8702c6 DL	33	bool seg6_validate_srh(struct ipv6_sr_hdr *srh, int len)
	34	{
	35	int trailing;
	36	unsigned int tlv_offset;
	37
	38	if (srh->type != IPV6_SRCRT_TYPE_4)
	39	return false;
	40
	41	if (((srh->hdrlen + 1) << 3) != len)
	42	return false;
	43
925615ce	44	if (srh->segments_left > srh->first_segment)
6c8702c6 DL	45	return false;
	46
	47	tlv_offset = sizeof(*srh) + ((srh->first_segment + 1) << 4);
	48
	49	trailing = len - tlv_offset;
	50	if (trailing < 0)
	51	return false;
	52
	53	while (trailing) {
	54	struct sr6_tlv *tlv;
	55	unsigned int tlv_len;
	56
2f3bb642 DL	57	if (trailing < sizeof(*tlv))
	58	return false;
	59
6c8702c6 DL	60	tlv = (struct sr6_tlv )((unsigned char )srh + tlv_offset);
	61	tlv_len = sizeof(*tlv) + tlv->len;
	62
	63	trailing -= tlv_len;
	64	if (trailing < 0)
	65	return false;
	66
	67	tlv_offset += tlv_len;
	68	}
	69
	70	return true;
	71	}
	72
915d7e5e DL	73	static struct genl_family seg6_genl_family;
	74
	75	static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
	76	[SEG6_ATTR_DST] = { .type = NLA_BINARY,
	77	.len = sizeof(struct in6_addr) },
	78	[SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
	79	[SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
	80	[SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
	81	[SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
	82	[SEG6_ATTR_ALGID] = { .type = NLA_U8, },
	83	[SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
	84	};
	85
4f4853dc DL	86	#ifdef CONFIG_IPV6_SEG6_HMAC
	87
	88	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	89	{
	90	struct net *net = genl_info_net(info);
	91	struct seg6_pernet_data *sdata;
	92	struct seg6_hmac_info *hinfo;
	93	u32 hmackeyid;
	94	char *secret;
	95	int err = 0;
	96	u8 algid;
	97	u8 slen;
	98
	99	sdata = seg6_pernet(net);
	100
	101	if (!info->attrs[SEG6_ATTR_HMACKEYID] \|\|
	102	!info->attrs[SEG6_ATTR_SECRETLEN] \|\|
	103	!info->attrs[SEG6_ATTR_ALGID])
	104	return -EINVAL;
	105
	106	hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
	107	slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
	108	algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
	109
	110	if (hmackeyid == 0)
	111	return -EINVAL;
	112
	113	if (slen > SEG6_HMAC_SECRET_LEN)
	114	return -EINVAL;
	115
	116	mutex_lock(&sdata->lock);
	117	hinfo = seg6_hmac_info_lookup(net, hmackeyid);
	118
	119	if (!slen) {
	120	if (!hinfo)
	121	err = -ENOENT;
	122
	123	err = seg6_hmac_info_del(net, hmackeyid);
	124
	125	goto out_unlock;
	126	}
	127
	128	if (!info->attrs[SEG6_ATTR_SECRET]) {
	129	err = -EINVAL;
	130	goto out_unlock;
	131	}
	132
	133	if (hinfo) {
	134	err = seg6_hmac_info_del(net, hmackeyid);
	135	if (err)
	136	goto out_unlock;
	137	}
	138
	139	secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
	140
	141	hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
	142	if (!hinfo) {
	143	err = -ENOMEM;
	144	goto out_unlock;
	145	}
	146
	147	memcpy(hinfo->secret, secret, slen);
	148	hinfo->slen = slen;
	149	hinfo->alg_id = algid;
150	hinfo->hmackeyid = hmackeyid;
151
152	err = seg6_hmac_info_add(net, hmackeyid, hinfo);
153	if (err)
154	kfree(hinfo);
155
156	out_unlock:
157	mutex_unlock(&sdata->lock);
158	return err;
159	}
160
161	#else
162
915d7e5e DL	163	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	164	{
	165	return -ENOTSUPP;
	166	}
	167
4f4853dc DL	168	#endif
4f4853dc DL	169
915d7e5e DL	170	static int seg6_genl_set_tunsrc(struct sk_buff skb, struct genl_info info)
	171	{
	172	struct net *net = genl_info_net(info);
	173	struct in6_addr val, t_old, *t_new;
	174	struct seg6_pernet_data *sdata;
	175
	176	sdata = seg6_pernet(net);
	177
	178	if (!info->attrs[SEG6_ATTR_DST])
	179	return -EINVAL;
	180
	181	val = nla_data(info->attrs[SEG6_ATTR_DST]);
	182	t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
e363116b ED	183	if (!t_new)
e363116b ED	184	return -ENOMEM;
915d7e5e DL	185
	186	mutex_lock(&sdata->lock);
	187
	188	t_old = sdata->tun_src;
	189	rcu_assign_pointer(sdata->tun_src, t_new);
	190
	191	mutex_unlock(&sdata->lock);
	192
	193	synchronize_net();
	194	kfree(t_old);
	195
	196	return 0;
	197	}
	198
	199	static int seg6_genl_get_tunsrc(struct sk_buff skb, struct genl_info info)
	200	{
	201	struct net *net = genl_info_net(info);
	202	struct in6_addr *tun_src;
	203	struct sk_buff *msg;
	204	void *hdr;
	205
	206	msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	207	if (!msg)
	208	return -ENOMEM;
	209
	210	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	211	&seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
	212	if (!hdr)
	213	goto free_msg;
	214
	215	rcu_read_lock();
	216	tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
	217
	218	if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
	219	goto nla_put_failure;
	220
	221	rcu_read_unlock();
	222
	223	genlmsg_end(msg, hdr);
d1f20798	224	return genlmsg_reply(msg, info);
915d7e5e DL	225
	226	nla_put_failure:
	227	rcu_read_unlock();
915d7e5e DL	228	free_msg:
	229	nlmsg_free(msg);
	230	return -ENOMEM;
	231	}
	232
4f4853dc DL	233	#ifdef CONFIG_IPV6_SEG6_HMAC
	234
	235	static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
	236	struct sk_buff *msg)
	237	{
	238	if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) \|\|
	239	nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) \|\|
	240	nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) \|\|
	241	nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
	242	return -1;
	243
	244	return 0;
	245	}
	246
	247	static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
	248	u32 portid, u32 seq, u32 flags,
	249	struct sk_buff *skb, u8 cmd)
	250	{
	251	void *hdr;
	252
	253	hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
	254	if (!hdr)
	255	return -ENOMEM;
	256
	257	if (__seg6_hmac_fill_info(hinfo, skb) < 0)
	258	goto nla_put_failure;
	259
	260	genlmsg_end(skb, hdr);
	261	return 0;
	262
	263	nla_put_failure:
	264	genlmsg_cancel(skb, hdr);
	265	return -EMSGSIZE;
	266	}
	267
	268	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	269	{
	270	struct net *net = sock_net(cb->skb->sk);
	271	struct seg6_pernet_data *sdata;
	272	struct rhashtable_iter *iter;
	273
	274	sdata = seg6_pernet(net);
	275	iter = (struct rhashtable_iter *)cb->args[0];
	276
	277	if (!iter) {
	278	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
	279	if (!iter)
	280	return -ENOMEM;
	281
	282	cb->args[0] = (long)iter;
	283	}
	284
	285	rhashtable_walk_enter(&sdata->hmac_infos, iter);
	286
	287	return 0;
	288	}
	289
	290	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	291	{
	292	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
	293
	294	rhashtable_walk_exit(iter);
	295
	296	kfree(iter);
297
298	return 0;
299	}
300
301	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
302	{
303	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
4f4853dc DL	304	struct seg6_hmac_info *hinfo;
	305	int ret;
	306
97a6ec4a	307	rhashtable_walk_start(iter);
4f4853dc DL	308
	309	for (;;) {
	310	hinfo = rhashtable_walk_next(iter);
	311
	312	if (IS_ERR(hinfo)) {
	313	if (PTR_ERR(hinfo) == -EAGAIN)
	314	continue;
	315	ret = PTR_ERR(hinfo);
	316	goto done;
	317	} else if (!hinfo) {
	318	break;
	319	}
	320
	321	ret = __seg6_genl_dumphmac_element(hinfo,
	322	NETLINK_CB(cb->skb).portid,
	323	cb->nlh->nlmsg_seq,
	324	NLM_F_MULTI,
	325	skb, SEG6_CMD_DUMPHMAC);
	326	if (ret)
	327	goto done;
	328	}
	329
	330	ret = skb->len;
	331
	332	done:
	333	rhashtable_walk_stop(iter);
	334	return ret;
	335	}
	336
	337	#else
	338
	339	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	340	{
	341	return 0;
	342	}
	343
	344	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	345	{
	346	return 0;
	347	}
	348
915d7e5e DL	349	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
	350	{
	351	return -ENOTSUPP;
	352	}
	353
4f4853dc DL	354	#endif
4f4853dc DL	355
915d7e5e DL	356	static int __net_init seg6_net_init(struct net *net)
	357	{
	358	struct seg6_pernet_data *sdata;
	359
	360	sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
	361	if (!sdata)
	362	return -ENOMEM;
	363
	364	mutex_init(&sdata->lock);
	365
	366	sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
	367	if (!sdata->tun_src) {
	368	kfree(sdata);
	369	return -ENOMEM;
	370	}
	371
	372	net->ipv6.seg6_data = sdata;
	373
4f4853dc DL	374	#ifdef CONFIG_IPV6_SEG6_HMAC
	375	seg6_hmac_net_init(net);
	376	#endif
	377
915d7e5e DL	378	return 0;
	379	}
	380
	381	static void __net_exit seg6_net_exit(struct net *net)
	382	{
	383	struct seg6_pernet_data *sdata = seg6_pernet(net);
	384
4f4853dc DL	385	#ifdef CONFIG_IPV6_SEG6_HMAC
	386	seg6_hmac_net_exit(net);
	387	#endif
	388
915d7e5e DL	389	kfree(sdata->tun_src);
	390	kfree(sdata);
	391	}
	392
	393	static struct pernet_operations ip6_segments_ops = {
	394	.init = seg6_net_init,
	395	.exit = seg6_net_exit,
	396	};
	397
	398	static const struct genl_ops seg6_genl_ops[] = {
	399	{
	400	.cmd = SEG6_CMD_SETHMAC,
	401	.doit = seg6_genl_sethmac,
915d7e5e DL	402	.flags = GENL_ADMIN_PERM,
	403	},
	404	{
	405	.cmd = SEG6_CMD_DUMPHMAC,
4f4853dc	406	.start = seg6_genl_dumphmac_start,
915d7e5e	407	.dumpit = seg6_genl_dumphmac,
4f4853dc	408	.done = seg6_genl_dumphmac_done,
915d7e5e DL	409	.flags = GENL_ADMIN_PERM,
	410	},
	411	{
	412	.cmd = SEG6_CMD_SET_TUNSRC,
	413	.doit = seg6_genl_set_tunsrc,
915d7e5e DL	414	.flags = GENL_ADMIN_PERM,
	415	},
	416	{
	417	.cmd = SEG6_CMD_GET_TUNSRC,
	418	.doit = seg6_genl_get_tunsrc,
915d7e5e DL	419	.flags = GENL_ADMIN_PERM,
	420	},
	421	};
	422
	423	static struct genl_family seg6_genl_family __ro_after_init = {
	424	.hdrsize = 0,
	425	.name = SEG6_GENL_NAME,
	426	.version = SEG6_GENL_VERSION,
	427	.maxattr = SEG6_ATTR_MAX,
3b0f31f2	428	.policy = seg6_genl_policy,
915d7e5e DL	429	.netnsok = true,
	430	.parallel_ops = true,
	431	.ops = seg6_genl_ops,
	432	.n_ops = ARRAY_SIZE(seg6_genl_ops),
	433	.module = THIS_MODULE,
	434	};
	435
	436	int __init seg6_init(void)
	437	{
	438	int err = -ENOMEM;
	439
	440	err = genl_register_family(&seg6_genl_family);
	441	if (err)
	442	goto out;
	443
	444	err = register_pernet_subsys(&ip6_segments_ops);
	445	if (err)
	446	goto out_unregister_genl;
	447
46738b13	448	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	449	err = seg6_iptunnel_init();
	450	if (err)
	451	goto out_unregister_pernet;
d1df6fd8 DL	452
	453	err = seg6_local_init();
	454	if (err)
	455	goto out_unregister_pernet;
46738b13	456	#endif
6c8702c6	457
4f4853dc DL	458	#ifdef CONFIG_IPV6_SEG6_HMAC
	459	err = seg6_hmac_init();
	460	if (err)
	461	goto out_unregister_iptun;
	462	#endif
	463
915d7e5e DL	464	pr_info("Segment Routing with IPv6\n");
	465
	466	out:
	467	return err;
4f4853dc DL	468	#ifdef CONFIG_IPV6_SEG6_HMAC
4f4853dc DL	469	out_unregister_iptun:
46738b13	470	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
d1df6fd8	471	seg6_local_exit();
4f4853dc DL	472	seg6_iptunnel_exit();
4f4853dc DL	473	#endif
46738b13 DL	474	#endif
46738b13 DL	475	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	476	out_unregister_pernet:
6c8702c6 DL	477	unregister_pernet_subsys(&ip6_segments_ops);
46738b13	478	#endif
915d7e5e DL	479	out_unregister_genl:
	480	genl_unregister_family(&seg6_genl_family);
	481	goto out;
	482	}
	483
	484	void seg6_exit(void)
	485	{
4f4853dc DL	486	#ifdef CONFIG_IPV6_SEG6_HMAC
	487	seg6_hmac_exit();
	488	#endif
46738b13	489	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6	490	seg6_iptunnel_exit();
46738b13	491	#endif
915d7e5e DL	492	unregister_pernet_subsys(&ip6_segments_ops);
	493	genl_unregister_family(&seg6_genl_family);
	494	}