[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, 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;
}

struct ipv6_sr_hdr *seg6_get_srh(struct sk_buff *skb, int flags)
{
	struct ipv6_sr_hdr *srh;
	int len, srhoff = 0;

	if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, &flags) < 0)
		return NULL;

	if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
		return NULL;

	srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);

	len = (srh->hdrlen + 1) << 3;

	if (!pskb_may_pull(skb, srhoff + len))
		return NULL;

	/* note that pskb_may_pull may change pointers in header;
	 * for this reason it is necessary to reload them when needed.
	 */
	srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);

	if (!seg6_validate_srh(srh, len, true))
		return NULL;

	return srh;
}

/* Determine if an ICMP invoking packet contains a segment routing
 * header.  If it does, extract the offset to the true destination
 * address, which is in the first segment address.
 */
void seg6_icmp_srh(struct sk_buff *skb, struct inet6_skb_parm *opt)
{
	__u16 network_header = skb->network_header;
	struct ipv6_sr_hdr *srh;

	/* Update network header to point to the invoking packet
	 * inside the ICMP packet, so we can use the seg6_get_srh()
	 * helper.
	 */
	skb_reset_network_header(skb);

	srh = seg6_get_srh(skb, 0);
	if (!srh)
		goto out;

	if (srh->type != IPV6_SRCRT_TYPE_4)
		goto out;

	opt->flags |= IP6SKB_SEG6;
	opt->srhoff = (unsigned char *)srh - skb->data;

out:
	/* Restore the network header back to the ICMP packet */
	skb->network_header = network_header;
}

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
	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;

	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
52fe0b9a AL	78	struct ipv6_sr_hdr seg6_get_srh(struct sk_buff skb, int flags)
	79	{
	80	struct ipv6_sr_hdr *srh;
	81	int len, srhoff = 0;
	82
	83	if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, &flags) < 0)
	84	return NULL;
	85
	86	if (!pskb_may_pull(skb, srhoff + sizeof(*srh)))
	87	return NULL;
	88
	89	srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
	90
	91	len = (srh->hdrlen + 1) << 3;
	92
	93	if (!pskb_may_pull(skb, srhoff + len))
	94	return NULL;
	95
	96	/* note that pskb_may_pull may change pointers in header;
	97	* for this reason it is necessary to reload them when needed.
	98	*/
	99	srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
	100
	101	if (!seg6_validate_srh(srh, len, true))
	102	return NULL;
	103
	104	return srh;
	105	}
	106
26c26034 AL	107	/* Determine if an ICMP invoking packet contains a segment routing
	108	* header. If it does, extract the offset to the true destination
	109	* address, which is in the first segment address.
	110	*/
	111	void seg6_icmp_srh(struct sk_buff skb, struct inet6_skb_parm opt)
	112	{
	113	__u16 network_header = skb->network_header;
	114	struct ipv6_sr_hdr *srh;
	115
	116	/* Update network header to point to the invoking packet
	117	* inside the ICMP packet, so we can use the seg6_get_srh()
	118	* helper.
	119	*/
	120	skb_reset_network_header(skb);
	121
	122	srh = seg6_get_srh(skb, 0);
	123	if (!srh)
	124	goto out;
	125
	126	if (srh->type != IPV6_SRCRT_TYPE_4)
	127	goto out;
	128
	129	opt->flags \|= IP6SKB_SEG6;
	130	opt->srhoff = (unsigned char *)srh - skb->data;
	131
	132	out:
	133	/* Restore the network header back to the ICMP packet */
	134	skb->network_header = network_header;
	135	}
	136
915d7e5e DL	137	static struct genl_family seg6_genl_family;
	138
	139	static const struct nla_policy seg6_genl_policy[SEG6_ATTR_MAX + 1] = {
	140	[SEG6_ATTR_DST] = { .type = NLA_BINARY,
	141	.len = sizeof(struct in6_addr) },
	142	[SEG6_ATTR_DSTLEN] = { .type = NLA_S32, },
	143	[SEG6_ATTR_HMACKEYID] = { .type = NLA_U32, },
	144	[SEG6_ATTR_SECRET] = { .type = NLA_BINARY, },
	145	[SEG6_ATTR_SECRETLEN] = { .type = NLA_U8, },
	146	[SEG6_ATTR_ALGID] = { .type = NLA_U8, },
	147	[SEG6_ATTR_HMACINFO] = { .type = NLA_NESTED, },
	148	};
	149
4f4853dc DL	150	#ifdef CONFIG_IPV6_SEG6_HMAC
	151
	152	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	153	{
	154	struct net *net = genl_info_net(info);
	155	struct seg6_pernet_data *sdata;
	156	struct seg6_hmac_info *hinfo;
	157	u32 hmackeyid;
	158	char *secret;
	159	int err = 0;
	160	u8 algid;
	161	u8 slen;
	162
	163	sdata = seg6_pernet(net);
	164
	165	if (!info->attrs[SEG6_ATTR_HMACKEYID] \|\|
	166	!info->attrs[SEG6_ATTR_SECRETLEN] \|\|
	167	!info->attrs[SEG6_ATTR_ALGID])
	168	return -EINVAL;
	169
	170	hmackeyid = nla_get_u32(info->attrs[SEG6_ATTR_HMACKEYID]);
	171	slen = nla_get_u8(info->attrs[SEG6_ATTR_SECRETLEN]);
	172	algid = nla_get_u8(info->attrs[SEG6_ATTR_ALGID]);
	173
	174	if (hmackeyid == 0)
	175	return -EINVAL;
	176
	177	if (slen > SEG6_HMAC_SECRET_LEN)
	178	return -EINVAL;
	179
	180	mutex_lock(&sdata->lock);
	181	hinfo = seg6_hmac_info_lookup(net, hmackeyid);
	182
	183	if (!slen) {
4f4853dc DL	184	err = seg6_hmac_info_del(net, hmackeyid);
	185
	186	goto out_unlock;
	187	}
	188
	189	if (!info->attrs[SEG6_ATTR_SECRET]) {
	190	err = -EINVAL;
	191	goto out_unlock;
	192	}
	193
	194	if (hinfo) {
	195	err = seg6_hmac_info_del(net, hmackeyid);
	196	if (err)
	197	goto out_unlock;
	198	}
	199
	200	secret = (char *)nla_data(info->attrs[SEG6_ATTR_SECRET]);
	201
	202	hinfo = kzalloc(sizeof(*hinfo), GFP_KERNEL);
	203	if (!hinfo) {
	204	err = -ENOMEM;
	205	goto out_unlock;
	206	}
	207
	208	memcpy(hinfo->secret, secret, slen);
	209	hinfo->slen = slen;
	210	hinfo->alg_id = algid;
	211	hinfo->hmackeyid = hmackeyid;
	212
	213	err = seg6_hmac_info_add(net, hmackeyid, hinfo);
	214	if (err)
	215	kfree(hinfo);
	216
	217	out_unlock:
	218	mutex_unlock(&sdata->lock);
	219	return err;
	220	}
	221
	222	#else
	223
915d7e5e DL	224	static int seg6_genl_sethmac(struct sk_buff skb, struct genl_info info)
	225	{
	226	return -ENOTSUPP;
	227	}
	228
4f4853dc DL	229	#endif
4f4853dc DL	230
915d7e5e DL	231	static int seg6_genl_set_tunsrc(struct sk_buff skb, struct genl_info info)
	232	{
	233	struct net *net = genl_info_net(info);
	234	struct in6_addr val, t_old, *t_new;
	235	struct seg6_pernet_data *sdata;
	236
	237	sdata = seg6_pernet(net);
	238
	239	if (!info->attrs[SEG6_ATTR_DST])
	240	return -EINVAL;
	241
	242	val = nla_data(info->attrs[SEG6_ATTR_DST]);
	243	t_new = kmemdup(val, sizeof(*val), GFP_KERNEL);
e363116b ED	244	if (!t_new)
e363116b ED	245	return -ENOMEM;
915d7e5e DL	246
	247	mutex_lock(&sdata->lock);
	248
	249	t_old = sdata->tun_src;
	250	rcu_assign_pointer(sdata->tun_src, t_new);
	251
	252	mutex_unlock(&sdata->lock);
	253
	254	synchronize_net();
	255	kfree(t_old);
	256
	257	return 0;
	258	}
	259
	260	static int seg6_genl_get_tunsrc(struct sk_buff skb, struct genl_info info)
	261	{
	262	struct net *net = genl_info_net(info);
	263	struct in6_addr *tun_src;
	264	struct sk_buff *msg;
	265	void *hdr;
	266
	267	msg = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	268	if (!msg)
	269	return -ENOMEM;
	270
	271	hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	272	&seg6_genl_family, 0, SEG6_CMD_GET_TUNSRC);
	273	if (!hdr)
	274	goto free_msg;
	275
	276	rcu_read_lock();
	277	tun_src = rcu_dereference(seg6_pernet(net)->tun_src);
	278
	279	if (nla_put(msg, SEG6_ATTR_DST, sizeof(struct in6_addr), tun_src))
	280	goto nla_put_failure;
	281
	282	rcu_read_unlock();
	283
	284	genlmsg_end(msg, hdr);
d1f20798	285	return genlmsg_reply(msg, info);
915d7e5e DL	286
	287	nla_put_failure:
	288	rcu_read_unlock();
915d7e5e DL	289	free_msg:
	290	nlmsg_free(msg);
	291	return -ENOMEM;
	292	}
	293
4f4853dc DL	294	#ifdef CONFIG_IPV6_SEG6_HMAC
	295
	296	static int __seg6_hmac_fill_info(struct seg6_hmac_info *hinfo,
	297	struct sk_buff *msg)
	298	{
	299	if (nla_put_u32(msg, SEG6_ATTR_HMACKEYID, hinfo->hmackeyid) \|\|
	300	nla_put_u8(msg, SEG6_ATTR_SECRETLEN, hinfo->slen) \|\|
	301	nla_put(msg, SEG6_ATTR_SECRET, hinfo->slen, hinfo->secret) \|\|
	302	nla_put_u8(msg, SEG6_ATTR_ALGID, hinfo->alg_id))
	303	return -1;
	304
	305	return 0;
	306	}
	307
	308	static int __seg6_genl_dumphmac_element(struct seg6_hmac_info *hinfo,
	309	u32 portid, u32 seq, u32 flags,
	310	struct sk_buff *skb, u8 cmd)
	311	{
	312	void *hdr;
	313
	314	hdr = genlmsg_put(skb, portid, seq, &seg6_genl_family, flags, cmd);
	315	if (!hdr)
	316	return -ENOMEM;
	317
	318	if (__seg6_hmac_fill_info(hinfo, skb) < 0)
	319	goto nla_put_failure;
	320
	321	genlmsg_end(skb, hdr);
	322	return 0;
	323
	324	nla_put_failure:
	325	genlmsg_cancel(skb, hdr);
	326	return -EMSGSIZE;
	327	}
	328
	329	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	330	{
	331	struct net *net = sock_net(cb->skb->sk);
	332	struct seg6_pernet_data *sdata;
	333	struct rhashtable_iter *iter;
	334
	335	sdata = seg6_pernet(net);
	336	iter = (struct rhashtable_iter *)cb->args[0];
	337
	338	if (!iter) {
	339	iter = kmalloc(sizeof(*iter), GFP_KERNEL);
	340	if (!iter)
	341	return -ENOMEM;
	342
	343	cb->args[0] = (long)iter;
	344	}
	345
	346	rhashtable_walk_enter(&sdata->hmac_infos, iter);
	347
	348	return 0;
	349	}
	350
	351	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	352	{
	353	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
	354
	355	rhashtable_walk_exit(iter);
	356
	357	kfree(iter);
358
359	return 0;
360	}
361
362	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
363	{
364	struct rhashtable_iter iter = (struct rhashtable_iter )cb->args[0];
4f4853dc DL	365	struct seg6_hmac_info *hinfo;
	366	int ret;
	367
97a6ec4a	368	rhashtable_walk_start(iter);
4f4853dc DL	369
	370	for (;;) {
	371	hinfo = rhashtable_walk_next(iter);
	372
	373	if (IS_ERR(hinfo)) {
	374	if (PTR_ERR(hinfo) == -EAGAIN)
	375	continue;
	376	ret = PTR_ERR(hinfo);
	377	goto done;
	378	} else if (!hinfo) {
	379	break;
	380	}
	381
	382	ret = __seg6_genl_dumphmac_element(hinfo,
	383	NETLINK_CB(cb->skb).portid,
	384	cb->nlh->nlmsg_seq,
	385	NLM_F_MULTI,
	386	skb, SEG6_CMD_DUMPHMAC);
	387	if (ret)
	388	goto done;
	389	}
	390
	391	ret = skb->len;
	392
	393	done:
	394	rhashtable_walk_stop(iter);
	395	return ret;
	396	}
	397
	398	#else
	399
	400	static int seg6_genl_dumphmac_start(struct netlink_callback *cb)
	401	{
	402	return 0;
	403	}
	404
	405	static int seg6_genl_dumphmac_done(struct netlink_callback *cb)
	406	{
	407	return 0;
	408	}
	409
915d7e5e DL	410	static int seg6_genl_dumphmac(struct sk_buff skb, struct netlink_callback cb)
	411	{
	412	return -ENOTSUPP;
	413	}
	414
4f4853dc DL	415	#endif
4f4853dc DL	416
915d7e5e DL	417	static int __net_init seg6_net_init(struct net *net)
	418	{
	419	struct seg6_pernet_data *sdata;
	420
	421	sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
	422	if (!sdata)
	423	return -ENOMEM;
	424
	425	mutex_init(&sdata->lock);
	426
	427	sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
	428	if (!sdata->tun_src) {
	429	kfree(sdata);
	430	return -ENOMEM;
	431	}
	432
	433	net->ipv6.seg6_data = sdata;
	434
4f4853dc DL	435	#ifdef CONFIG_IPV6_SEG6_HMAC
	436	seg6_hmac_net_init(net);
	437	#endif
	438
915d7e5e DL	439	return 0;
	440	}
	441
	442	static void __net_exit seg6_net_exit(struct net *net)
	443	{
	444	struct seg6_pernet_data *sdata = seg6_pernet(net);
	445
4f4853dc DL	446	#ifdef CONFIG_IPV6_SEG6_HMAC
	447	seg6_hmac_net_exit(net);
	448	#endif
	449
915d7e5e DL	450	kfree(sdata->tun_src);
	451	kfree(sdata);
	452	}
	453
	454	static struct pernet_operations ip6_segments_ops = {
	455	.init = seg6_net_init,
	456	.exit = seg6_net_exit,
	457	};
	458
	459	static const struct genl_ops seg6_genl_ops[] = {
	460	{
	461	.cmd = SEG6_CMD_SETHMAC,
ef6243ac	462	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	463	.doit = seg6_genl_sethmac,
915d7e5e DL	464	.flags = GENL_ADMIN_PERM,
	465	},
	466	{
	467	.cmd = SEG6_CMD_DUMPHMAC,
ef6243ac	468	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
4f4853dc	469	.start = seg6_genl_dumphmac_start,
915d7e5e	470	.dumpit = seg6_genl_dumphmac,
4f4853dc	471	.done = seg6_genl_dumphmac_done,
915d7e5e DL	472	.flags = GENL_ADMIN_PERM,
	473	},
	474	{
	475	.cmd = SEG6_CMD_SET_TUNSRC,
ef6243ac	476	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	477	.doit = seg6_genl_set_tunsrc,
915d7e5e DL	478	.flags = GENL_ADMIN_PERM,
	479	},
	480	{
	481	.cmd = SEG6_CMD_GET_TUNSRC,
ef6243ac	482	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
915d7e5e	483	.doit = seg6_genl_get_tunsrc,
915d7e5e DL	484	.flags = GENL_ADMIN_PERM,
	485	},
	486	};
	487
	488	static struct genl_family seg6_genl_family __ro_after_init = {
	489	.hdrsize = 0,
	490	.name = SEG6_GENL_NAME,
	491	.version = SEG6_GENL_VERSION,
	492	.maxattr = SEG6_ATTR_MAX,
3b0f31f2	493	.policy = seg6_genl_policy,
915d7e5e DL	494	.netnsok = true,
	495	.parallel_ops = true,
	496	.ops = seg6_genl_ops,
	497	.n_ops = ARRAY_SIZE(seg6_genl_ops),
	498	.module = THIS_MODULE,
	499	};
	500
	501	int __init seg6_init(void)
	502	{
672e2477	503	int err;
915d7e5e DL	504
	505	err = genl_register_family(&seg6_genl_family);
	506	if (err)
	507	goto out;
	508
	509	err = register_pernet_subsys(&ip6_segments_ops);
	510	if (err)
	511	goto out_unregister_genl;
	512
46738b13	513	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	514	err = seg6_iptunnel_init();
	515	if (err)
	516	goto out_unregister_pernet;
d1df6fd8 DL	517
	518	err = seg6_local_init();
	519	if (err)
	520	goto out_unregister_pernet;
46738b13	521	#endif
6c8702c6	522
4f4853dc DL	523	#ifdef CONFIG_IPV6_SEG6_HMAC
	524	err = seg6_hmac_init();
	525	if (err)
	526	goto out_unregister_iptun;
	527	#endif
	528
915d7e5e DL	529	pr_info("Segment Routing with IPv6\n");
	530
	531	out:
	532	return err;
4f4853dc DL	533	#ifdef CONFIG_IPV6_SEG6_HMAC
4f4853dc DL	534	out_unregister_iptun:
46738b13	535	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
d1df6fd8	536	seg6_local_exit();
4f4853dc DL	537	seg6_iptunnel_exit();
4f4853dc DL	538	#endif
46738b13 DL	539	#endif
46738b13 DL	540	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6 DL	541	out_unregister_pernet:
6c8702c6 DL	542	unregister_pernet_subsys(&ip6_segments_ops);
46738b13	543	#endif
915d7e5e DL	544	out_unregister_genl:
	545	genl_unregister_family(&seg6_genl_family);
	546	goto out;
	547	}
	548
	549	void seg6_exit(void)
	550	{
4f4853dc DL	551	#ifdef CONFIG_IPV6_SEG6_HMAC
	552	seg6_hmac_exit();
	553	#endif
46738b13	554	#ifdef CONFIG_IPV6_SEG6_LWTUNNEL
6c8702c6	555	seg6_iptunnel_exit();
46738b13	556	#endif
915d7e5e DL	557	unregister_pernet_subsys(&ip6_segments_ops);
	558	genl_unregister_family(&seg6_genl_family);
	559	}