[linux-2.6-block.git] / net / ipv6 / seg6_hmac.c

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

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/icmpv6.h>
#include <linux/mroute6.h>
#include <linux/slab.h>
#include <linux/rhashtable.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/rawv6.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/xfrm.h>

#include <linux/cryptohash.h>
#include <crypto/hash.h>
#include <crypto/sha.h>
#include <net/seg6.h>
#include <net/genetlink.h>
#include <net/seg6_hmac.h>
#include <linux/random.h>

static DEFINE_PER_CPU(char [SEG6_HMAC_RING_SIZE], hmac_ring);

static int seg6_hmac_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
{
	const struct seg6_hmac_info *hinfo = obj;

	return (hinfo->hmackeyid != *(__u32 *)arg->key);
}

static inline void seg6_hinfo_release(struct seg6_hmac_info *hinfo)
{
	kfree_rcu(hinfo, rcu);
}

static void seg6_free_hi(void *ptr, void *arg)
{
	struct seg6_hmac_info *hinfo = (struct seg6_hmac_info *)ptr;

	if (hinfo)
		seg6_hinfo_release(hinfo);
}

static const struct rhashtable_params rht_params = {
	.head_offset		= offsetof(struct seg6_hmac_info, node),
	.key_offset		= offsetof(struct seg6_hmac_info, hmackeyid),
	.key_len		= sizeof(u32),
	.automatic_shrinking	= true,
	.obj_cmpfn		= seg6_hmac_cmpfn,
};

static struct seg6_hmac_algo hmac_algos[] = {
	{
		.alg_id = SEG6_HMAC_ALGO_SHA1,
		.name = "hmac(sha1)",
	},
	{
		.alg_id = SEG6_HMAC_ALGO_SHA256,
		.name = "hmac(sha256)",
	},
};

static struct sr6_tlv_hmac *seg6_get_tlv_hmac(struct ipv6_sr_hdr *srh)
{
	struct sr6_tlv_hmac *tlv;

	if (srh->hdrlen < (srh->first_segment + 1) * 2 + 5)
		return NULL;

	if (!sr_has_hmac(srh))
		return NULL;

	tlv = (struct sr6_tlv_hmac *)
	      ((char *)srh + ((srh->hdrlen + 1) << 3) - 40);

	if (tlv->tlvhdr.type != SR6_TLV_HMAC || tlv->tlvhdr.len != 38)
		return NULL;

	return tlv;
}

static struct seg6_hmac_algo *__hmac_get_algo(u8 alg_id)
{
	struct seg6_hmac_algo *algo;
	int i, alg_count;

	alg_count = ARRAY_SIZE(hmac_algos);
	for (i = 0; i < alg_count; i++) {
		algo = &hmac_algos[i];
		if (algo->alg_id == alg_id)
			return algo;
	}

	return NULL;
}

static int __do_hmac(struct seg6_hmac_info *hinfo, const char *text, u8 psize,
		     u8 *output, int outlen)
{
	struct seg6_hmac_algo *algo;
	struct crypto_shash *tfm;
	struct shash_desc *shash;
	int ret, dgsize;

	algo = __hmac_get_algo(hinfo->alg_id);
	if (!algo)
		return -ENOENT;

	tfm = *this_cpu_ptr(algo->tfms);

	dgsize = crypto_shash_digestsize(tfm);
	if (dgsize > outlen) {
		pr_debug("sr-ipv6: __do_hmac: digest size too big (%d / %d)\n",
			 dgsize, outlen);
		return -ENOMEM;
	}

	ret = crypto_shash_setkey(tfm, hinfo->secret, hinfo->slen);
	if (ret < 0) {
		pr_debug("sr-ipv6: crypto_shash_setkey failed: err %d\n", ret);
		goto failed;
	}

	shash = *this_cpu_ptr(algo->shashs);
	shash->tfm = tfm;

	ret = crypto_shash_digest(shash, text, psize, output);
	if (ret < 0) {
		pr_debug("sr-ipv6: crypto_shash_digest failed: err %d\n", ret);
		goto failed;
	}

	return dgsize;

failed:
	return ret;
}

int seg6_hmac_compute(struct seg6_hmac_info *hinfo, struct ipv6_sr_hdr *hdr,
		      struct in6_addr *saddr, u8 *output)
{
	__be32 hmackeyid = cpu_to_be32(hinfo->hmackeyid);
	u8 tmp_out[SEG6_HMAC_MAX_DIGESTSIZE];
	int plen, i, dgsize, wrsize;
	char *ring, *off;

	/* a 160-byte buffer for digest output allows to store highest known
	 * hash function (RadioGatun) with up to 1216 bits
	 */

	/* saddr(16) + first_seg(1) + flags(1) + keyid(4) + seglist(16n) */
	plen = 16 + 1 + 1 + 4 + (hdr->first_segment + 1) * 16;

	/* this limit allows for 14 segments */
	if (plen >= SEG6_HMAC_RING_SIZE)
		return -EMSGSIZE;

	/* Let's build the HMAC text on the ring buffer. The text is composed
	 * as follows, in order:
	 *
	 * 1. Source IPv6 address (128 bits)
	 * 2. first_segment value (8 bits)
	 * 3. Flags (8 bits)
	 * 4. HMAC Key ID (32 bits)
	 * 5. All segments in the segments list (n * 128 bits)
	 */

	local_bh_disable();
	ring = this_cpu_ptr(hmac_ring);
	off = ring;

	/* source address */
	memcpy(off, saddr, 16);
	off += 16;

	/* first_segment value */
	*off++ = hdr->first_segment;

	/* flags */
	*off++ = hdr->flags;

	/* HMAC Key ID */
	memcpy(off, &hmackeyid, 4);
	off += 4;

	/* all segments in the list */
	for (i = 0; i < hdr->first_segment + 1; i++) {
		memcpy(off, hdr->segments + i, 16);
		off += 16;
	}

	dgsize = __do_hmac(hinfo, ring, plen, tmp_out,
			   SEG6_HMAC_MAX_DIGESTSIZE);
	local_bh_enable();

	if (dgsize < 0)
		return dgsize;

	wrsize = SEG6_HMAC_FIELD_LEN;
	if (wrsize > dgsize)
		wrsize = dgsize;

	memset(output, 0, SEG6_HMAC_FIELD_LEN);
	memcpy(output, tmp_out, wrsize);

	return 0;
}
EXPORT_SYMBOL(seg6_hmac_compute);

/* checks if an incoming SR-enabled packet's HMAC status matches
 * the incoming policy.
 *
 * called with rcu_read_lock()
 */
bool seg6_hmac_validate_skb(struct sk_buff *skb)
{
	u8 hmac_output[SEG6_HMAC_FIELD_LEN];
	struct net *net = dev_net(skb->dev);
	struct seg6_hmac_info *hinfo;
	struct sr6_tlv_hmac *tlv;
	struct ipv6_sr_hdr *srh;
	struct inet6_dev *idev;

	idev = __in6_dev_get(skb->dev);

	srh = (struct ipv6_sr_hdr *)skb_transport_header(skb);

	tlv = seg6_get_tlv_hmac(srh);

	/* mandatory check but no tlv */
	if (idev->cnf.seg6_require_hmac > 0 && !tlv)
		return false;

	/* no check */
	if (idev->cnf.seg6_require_hmac < 0)
		return true;

	/* check only if present */
	if (idev->cnf.seg6_require_hmac == 0 && !tlv)
		return true;

	/* now, seg6_require_hmac >= 0 && tlv */

	hinfo = seg6_hmac_info_lookup(net, be32_to_cpu(tlv->hmackeyid));
	if (!hinfo)
		return false;

	if (seg6_hmac_compute(hinfo, srh, &ipv6_hdr(skb)->saddr, hmac_output))
		return false;

	if (memcmp(hmac_output, tlv->hmac, SEG6_HMAC_FIELD_LEN) != 0)
		return false;

	return true;
}
EXPORT_SYMBOL(seg6_hmac_validate_skb);

/* called with rcu_read_lock() */
struct seg6_hmac_info *seg6_hmac_info_lookup(struct net *net, u32 key)
{
	struct seg6_pernet_data *sdata = seg6_pernet(net);
	struct seg6_hmac_info *hinfo;

	hinfo = rhashtable_lookup_fast(&sdata->hmac_infos, &key, rht_params);

	return hinfo;
}
EXPORT_SYMBOL(seg6_hmac_info_lookup);

int seg6_hmac_info_add(struct net *net, u32 key, struct seg6_hmac_info *hinfo)
{
	struct seg6_pernet_data *sdata = seg6_pernet(net);
	int err;

	err = rhashtable_lookup_insert_fast(&sdata->hmac_infos, &hinfo->node,
					    rht_params);

	return err;
}
EXPORT_SYMBOL(seg6_hmac_info_add);

int seg6_hmac_info_del(struct net *net, u32 key)
{
	struct seg6_pernet_data *sdata = seg6_pernet(net);
	struct seg6_hmac_info *hinfo;
	int err = -ENOENT;

	hinfo = rhashtable_lookup_fast(&sdata->hmac_infos, &key, rht_params);
	if (!hinfo)
		goto out;

	err = rhashtable_remove_fast(&sdata->hmac_infos, &hinfo->node,
				     rht_params);
	if (err)
		goto out;

	seg6_hinfo_release(hinfo);

out:
	return err;
}
EXPORT_SYMBOL(seg6_hmac_info_del);

int seg6_push_hmac(struct net *net, struct in6_addr *saddr,
		   struct ipv6_sr_hdr *srh)
{
	struct seg6_hmac_info *hinfo;
	struct sr6_tlv_hmac *tlv;
	int err = -ENOENT;

	tlv = seg6_get_tlv_hmac(srh);
	if (!tlv)
		return -EINVAL;

	rcu_read_lock();

	hinfo = seg6_hmac_info_lookup(net, be32_to_cpu(tlv->hmackeyid));
	if (!hinfo)
		goto out;

	memset(tlv->hmac, 0, SEG6_HMAC_FIELD_LEN);
	err = seg6_hmac_compute(hinfo, srh, saddr, tlv->hmac);

out:
	rcu_read_unlock();
	return err;
}
EXPORT_SYMBOL(seg6_push_hmac);

static int seg6_hmac_init_algo(void)
{
	struct seg6_hmac_algo *algo;
	struct crypto_shash *tfm;
	struct shash_desc *shash;
	int i, alg_count, cpu;

	alg_count = ARRAY_SIZE(hmac_algos);

	for (i = 0; i < alg_count; i++) {
		struct crypto_shash **p_tfm;
		int shsize;

		algo = &hmac_algos[i];
		algo->tfms = alloc_percpu(struct crypto_shash *);
		if (!algo->tfms)
			return -ENOMEM;

		for_each_possible_cpu(cpu) {
			tfm = crypto_alloc_shash(algo->name, 0, 0);
			if (IS_ERR(tfm))
				return PTR_ERR(tfm);
			p_tfm = per_cpu_ptr(algo->tfms, cpu);
			*p_tfm = tfm;
		}

		p_tfm = raw_cpu_ptr(algo->tfms);
		tfm = *p_tfm;

		shsize = sizeof(*shash) + crypto_shash_descsize(tfm);

		algo->shashs = alloc_percpu(struct shash_desc *);
		if (!algo->shashs)
			return -ENOMEM;

		for_each_possible_cpu(cpu) {
			shash = kzalloc_node(shsize, GFP_KERNEL,
					     cpu_to_node(cpu));
			if (!shash)
				return -ENOMEM;
			*per_cpu_ptr(algo->shashs, cpu) = shash;
		}
	}

	return 0;
}

int __init seg6_hmac_init(void)
{
	return seg6_hmac_init_algo();
}
EXPORT_SYMBOL(seg6_hmac_init);

int __net_init seg6_hmac_net_init(struct net *net)
{
	struct seg6_pernet_data *sdata = seg6_pernet(net);

	rhashtable_init(&sdata->hmac_infos, &rht_params);

	return 0;
}
EXPORT_SYMBOL(seg6_hmac_net_init);

void seg6_hmac_exit(void)
{
	struct seg6_hmac_algo *algo = NULL;
	int i, alg_count, cpu;

	alg_count = ARRAY_SIZE(hmac_algos);
	for (i = 0; i < alg_count; i++) {
		algo = &hmac_algos[i];
		for_each_possible_cpu(cpu) {
			struct crypto_shash *tfm;
			struct shash_desc *shash;

			shash = *per_cpu_ptr(algo->shashs, cpu);
			kfree(shash);
			tfm = *per_cpu_ptr(algo->tfms, cpu);
			crypto_free_shash(tfm);
		}
		free_percpu(algo->tfms);
		free_percpu(algo->shashs);
	}
}
EXPORT_SYMBOL(seg6_hmac_exit);

void __net_exit seg6_hmac_net_exit(struct net *net)
{
	struct seg6_pernet_data *sdata = seg6_pernet(net);

	rhashtable_free_and_destroy(&sdata->hmac_infos, seg6_free_hi, NULL);
}
EXPORT_SYMBOL(seg6_hmac_net_exit);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
bf355b8d DL	2	/*
	3	* SR-IPv6 implementation -- HMAC functions
	4	*
	5	* Author:
	6	* David Lebrun <david.lebrun@uclouvain.be>
bf355b8d DL	7	*/
	8
	9	#include <linux/errno.h>
6391c4f6	10	#include <linux/kernel.h>
bf355b8d DL	11	#include <linux/types.h>
	12	#include <linux/socket.h>
	13	#include <linux/sockios.h>
	14	#include <linux/net.h>
	15	#include <linux/netdevice.h>
	16	#include <linux/in6.h>
	17	#include <linux/icmpv6.h>
	18	#include <linux/mroute6.h>
	19	#include <linux/slab.h>
0eb71a9d	20	#include <linux/rhashtable.h>
bf355b8d DL	21
	22	#include <linux/netfilter.h>
	23	#include <linux/netfilter_ipv6.h>
	24
	25	#include <net/sock.h>
	26	#include <net/snmp.h>
	27
	28	#include <net/ipv6.h>
	29	#include <net/protocol.h>
	30	#include <net/transp_v6.h>
	31	#include <net/rawv6.h>
	32	#include <net/ndisc.h>
	33	#include <net/ip6_route.h>
	34	#include <net/addrconf.h>
	35	#include <net/xfrm.h>
	36
	37	#include <linux/cryptohash.h>
	38	#include <crypto/hash.h>
	39	#include <crypto/sha.h>
	40	#include <net/seg6.h>
	41	#include <net/genetlink.h>
	42	#include <net/seg6_hmac.h>
	43	#include <linux/random.h>
	44
717ac5ce	45	static DEFINE_PER_CPU(char [SEG6_HMAC_RING_SIZE], hmac_ring);
bf355b8d DL	46
	47	static int seg6_hmac_cmpfn(struct rhashtable_compare_arg arg, const void obj)
	48	{
	49	const struct seg6_hmac_info *hinfo = obj;
	50
	51	return (hinfo->hmackeyid != (__u32 )arg->key);
	52	}
	53
	54	static inline void seg6_hinfo_release(struct seg6_hmac_info *hinfo)
	55	{
	56	kfree_rcu(hinfo, rcu);
	57	}
	58
	59	static void seg6_free_hi(void ptr, void arg)
	60	{
	61	struct seg6_hmac_info hinfo = (struct seg6_hmac_info )ptr;
	62
	63	if (hinfo)
	64	seg6_hinfo_release(hinfo);
	65	}
	66
	67	static const struct rhashtable_params rht_params = {
	68	.head_offset = offsetof(struct seg6_hmac_info, node),
	69	.key_offset = offsetof(struct seg6_hmac_info, hmackeyid),
	70	.key_len = sizeof(u32),
	71	.automatic_shrinking = true,
	72	.obj_cmpfn = seg6_hmac_cmpfn,
	73	};
	74
	75	static struct seg6_hmac_algo hmac_algos[] = {
	76	{
	77	.alg_id = SEG6_HMAC_ALGO_SHA1,
	78	.name = "hmac(sha1)",
	79	},
	80	{
	81	.alg_id = SEG6_HMAC_ALGO_SHA256,
	82	.name = "hmac(sha256)",
	83	},
	84	};
	85
	86	static struct sr6_tlv_hmac seg6_get_tlv_hmac(struct ipv6_sr_hdr srh)
	87	{
	88	struct sr6_tlv_hmac *tlv;
	89
	90	if (srh->hdrlen < (srh->first_segment + 1) * 2 + 5)
	91	return NULL;
	92
	93	if (!sr_has_hmac(srh))
	94	return NULL;
	95
	96	tlv = (struct sr6_tlv_hmac *)
	97	((char *)srh + ((srh->hdrlen + 1) << 3) - 40);
	98
	99	if (tlv->tlvhdr.type != SR6_TLV_HMAC \|\| tlv->tlvhdr.len != 38)
	100	return NULL;
	101
	102	return tlv;
	103	}
	104
	105	static struct seg6_hmac_algo *__hmac_get_algo(u8 alg_id)
	106	{
	107	struct seg6_hmac_algo *algo;
	108	int i, alg_count;
	109
6391c4f6	110	alg_count = ARRAY_SIZE(hmac_algos);
bf355b8d DL	111	for (i = 0; i < alg_count; i++) {
	112	algo = &hmac_algos[i];
	113	if (algo->alg_id == alg_id)
	114	return algo;
	115	}
	116
	117	return NULL;
	118	}
	119
	120	static int __do_hmac(struct seg6_hmac_info hinfo, const char text, u8 psize,
	121	u8 *output, int outlen)
	122	{
	123	struct seg6_hmac_algo *algo;
	124	struct crypto_shash *tfm;
	125	struct shash_desc *shash;
	126	int ret, dgsize;
	127
	128	algo = __hmac_get_algo(hinfo->alg_id);
	129	if (!algo)
	130	return -ENOENT;
	131
	132	tfm = *this_cpu_ptr(algo->tfms);
	133
	134	dgsize = crypto_shash_digestsize(tfm);
	135	if (dgsize > outlen) {
	136	pr_debug("sr-ipv6: __do_hmac: digest size too big (%d / %d)\n",
	137	dgsize, outlen);
	138	return -ENOMEM;
	139	}
	140
	141	ret = crypto_shash_setkey(tfm, hinfo->secret, hinfo->slen);
	142	if (ret < 0) {
	143	pr_debug("sr-ipv6: crypto_shash_setkey failed: err %d\n", ret);
	144	goto failed;
	145	}
	146
	147	shash = *this_cpu_ptr(algo->shashs);
	148	shash->tfm = tfm;
	149
	150	ret = crypto_shash_digest(shash, text, psize, output);
	151	if (ret < 0) {
	152	pr_debug("sr-ipv6: crypto_shash_digest failed: err %d\n", ret);
	153	goto failed;
	154	}
	155
	156	return dgsize;
	157
	158	failed:
	159	return ret;
	160	}
	161
	162	int seg6_hmac_compute(struct seg6_hmac_info hinfo, struct ipv6_sr_hdr hdr,
	163	struct in6_addr saddr, u8 output)
	164	{
	165	__be32 hmackeyid = cpu_to_be32(hinfo->hmackeyid);
	166	u8 tmp_out[SEG6_HMAC_MAX_DIGESTSIZE];
	167	int plen, i, dgsize, wrsize;
	168	char ring, off;
	169
	170	/* a 160-byte buffer for digest output allows to store highest known
	171	* hash function (RadioGatun) with up to 1216 bits
	172	*/
	173
013e8167	174	/* saddr(16) + first_seg(1) + flags(1) + keyid(4) + seglist(16n) */
bf355b8d DL	175	plen = 16 + 1 + 1 + 4 + (hdr->first_segment + 1) * 16;
	176
	177	/* this limit allows for 14 segments */
	178	if (plen >= SEG6_HMAC_RING_SIZE)
	179	return -EMSGSIZE;
	180
	181	/* Let's build the HMAC text on the ring buffer. The text is composed
	182	* as follows, in order:
	183	*
	184	* 1. Source IPv6 address (128 bits)
	185	* 2. first_segment value (8 bits)
013e8167	186	* 3. Flags (8 bits)
bf355b8d DL	187	* 4. HMAC Key ID (32 bits)
	188	* 5. All segments in the segments list (n * 128 bits)
	189	*/
	190
	191	local_bh_disable();
717ac5ce	192	ring = this_cpu_ptr(hmac_ring);
bf355b8d DL	193	off = ring;
	194
	195	/* source address */
	196	memcpy(off, saddr, 16);
	197	off += 16;
	198
	199	/* first_segment value */
	200	*off++ = hdr->first_segment;
	201
013e8167 DL	202	/* flags */
013e8167 DL	203	*off++ = hdr->flags;
bf355b8d DL	204
	205	/* HMAC Key ID */
	206	memcpy(off, &hmackeyid, 4);
	207	off += 4;
	208
	209	/* all segments in the list */
	210	for (i = 0; i < hdr->first_segment + 1; i++) {
	211	memcpy(off, hdr->segments + i, 16);
	212	off += 16;
	213	}
	214
	215	dgsize = __do_hmac(hinfo, ring, plen, tmp_out,
	216	SEG6_HMAC_MAX_DIGESTSIZE);
	217	local_bh_enable();
	218
	219	if (dgsize < 0)
	220	return dgsize;
	221
	222	wrsize = SEG6_HMAC_FIELD_LEN;
	223	if (wrsize > dgsize)
	224	wrsize = dgsize;
	225
	226	memset(output, 0, SEG6_HMAC_FIELD_LEN);
	227	memcpy(output, tmp_out, wrsize);
	228
	229	return 0;
	230	}
	231	EXPORT_SYMBOL(seg6_hmac_compute);
	232
	233	/* checks if an incoming SR-enabled packet's HMAC status matches
	234	* the incoming policy.
	235	*
	236	* called with rcu_read_lock()
	237	*/
	238	bool seg6_hmac_validate_skb(struct sk_buff *skb)
	239	{
	240	u8 hmac_output[SEG6_HMAC_FIELD_LEN];
	241	struct net *net = dev_net(skb->dev);
	242	struct seg6_hmac_info *hinfo;
	243	struct sr6_tlv_hmac *tlv;
	244	struct ipv6_sr_hdr *srh;
	245	struct inet6_dev *idev;
	246
	247	idev = __in6_dev_get(skb->dev);
	248
	249	srh = (struct ipv6_sr_hdr *)skb_transport_header(skb);
	250
	251	tlv = seg6_get_tlv_hmac(srh);
	252
	253	/* mandatory check but no tlv */
	254	if (idev->cnf.seg6_require_hmac > 0 && !tlv)
	255	return false;
	256
	257	/* no check */
	258	if (idev->cnf.seg6_require_hmac < 0)
	259	return true;
	260
	261	/* check only if present */
	262	if (idev->cnf.seg6_require_hmac == 0 && !tlv)
	263	return true;
	264
	265	/* now, seg6_require_hmac >= 0 && tlv */
	266
	267	hinfo = seg6_hmac_info_lookup(net, be32_to_cpu(tlv->hmackeyid));
268	if (!hinfo)
269	return false;
270
271	if (seg6_hmac_compute(hinfo, srh, &ipv6_hdr(skb)->saddr, hmac_output))
272	return false;
273
274	if (memcmp(hmac_output, tlv->hmac, SEG6_HMAC_FIELD_LEN) != 0)
275	return false;
276
277	return true;
278	}
279	EXPORT_SYMBOL(seg6_hmac_validate_skb);
280
281	/* called with rcu_read_lock() */
282	struct seg6_hmac_info seg6_hmac_info_lookup(struct net net, u32 key)
283	{
284	struct seg6_pernet_data *sdata = seg6_pernet(net);
285	struct seg6_hmac_info *hinfo;
286
287	hinfo = rhashtable_lookup_fast(&sdata->hmac_infos, &key, rht_params);
288
289	return hinfo;
290	}
291	EXPORT_SYMBOL(seg6_hmac_info_lookup);
292
293	int seg6_hmac_info_add(struct net net, u32 key, struct seg6_hmac_info hinfo)
294	{
295	struct seg6_pernet_data *sdata = seg6_pernet(net);
296	int err;
297
298	err = rhashtable_lookup_insert_fast(&sdata->hmac_infos, &hinfo->node,
299	rht_params);
300
301	return err;
302	}
303	EXPORT_SYMBOL(seg6_hmac_info_add);
304
305	int seg6_hmac_info_del(struct net *net, u32 key)
306	{
307	struct seg6_pernet_data *sdata = seg6_pernet(net);
308	struct seg6_hmac_info *hinfo;
309	int err = -ENOENT;
310
311	hinfo = rhashtable_lookup_fast(&sdata->hmac_infos, &key, rht_params);
312	if (!hinfo)
313	goto out;
314
315	err = rhashtable_remove_fast(&sdata->hmac_infos, &hinfo->node,
316	rht_params);
317	if (err)
318	goto out;
319
320	seg6_hinfo_release(hinfo);
321
322	out:
323	return err;
324	}
325	EXPORT_SYMBOL(seg6_hmac_info_del);
326
327	int seg6_push_hmac(struct net net, struct in6_addr saddr,
328	struct ipv6_sr_hdr *srh)
329	{
330	struct seg6_hmac_info *hinfo;
331	struct sr6_tlv_hmac *tlv;
332	int err = -ENOENT;
333
334	tlv = seg6_get_tlv_hmac(srh);
335	if (!tlv)
336	return -EINVAL;
337
338	rcu_read_lock();
339
340	hinfo = seg6_hmac_info_lookup(net, be32_to_cpu(tlv->hmackeyid));
341	if (!hinfo)
342	goto out;
343
344	memset(tlv->hmac, 0, SEG6_HMAC_FIELD_LEN);
345	err = seg6_hmac_compute(hinfo, srh, saddr, tlv->hmac);
346
347	out:
348	rcu_read_unlock();
349	return err;
350	}
351	EXPORT_SYMBOL(seg6_push_hmac);
352
bf355b8d DL	353	static int seg6_hmac_init_algo(void)
	354	{
	355	struct seg6_hmac_algo *algo;
	356	struct crypto_shash *tfm;
	357	struct shash_desc *shash;
	358	int i, alg_count, cpu;
	359
6391c4f6	360	alg_count = ARRAY_SIZE(hmac_algos);
bf355b8d DL	361
	362	for (i = 0; i < alg_count; i++) {
	363	struct crypto_shash **p_tfm;
	364	int shsize;
	365
	366	algo = &hmac_algos[i];
	367	algo->tfms = alloc_percpu(struct crypto_shash *);
	368	if (!algo->tfms)
	369	return -ENOMEM;
	370
	371	for_each_possible_cpu(cpu) {
fc9c2029	372	tfm = crypto_alloc_shash(algo->name, 0, 0);
bf355b8d DL	373	if (IS_ERR(tfm))
	374	return PTR_ERR(tfm);
	375	p_tfm = per_cpu_ptr(algo->tfms, cpu);
	376	*p_tfm = tfm;
	377	}
	378
fa79581e	379	p_tfm = raw_cpu_ptr(algo->tfms);
bf355b8d DL	380	tfm = *p_tfm;
	381
	382	shsize = sizeof(*shash) + crypto_shash_descsize(tfm);
	383
	384	algo->shashs = alloc_percpu(struct shash_desc *);
	385	if (!algo->shashs)
	386	return -ENOMEM;
	387
	388	for_each_possible_cpu(cpu) {
9ca677b1 ED	389	shash = kzalloc_node(shsize, GFP_KERNEL,
9ca677b1 ED	390	cpu_to_node(cpu));
bf355b8d DL	391	if (!shash)
	392	return -ENOMEM;
	393	*per_cpu_ptr(algo->shashs, cpu) = shash;
	394	}
	395	}
	396
	397	return 0;
	398	}
	399
	400	int __init seg6_hmac_init(void)
	401	{
717ac5ce	402	return seg6_hmac_init_algo();
bf355b8d DL	403	}
	404	EXPORT_SYMBOL(seg6_hmac_init);
	405
	406	int __net_init seg6_hmac_net_init(struct net *net)
	407	{
	408	struct seg6_pernet_data *sdata = seg6_pernet(net);
	409
	410	rhashtable_init(&sdata->hmac_infos, &rht_params);
	411
	412	return 0;
	413	}
	414	EXPORT_SYMBOL(seg6_hmac_net_init);
	415
	416	void seg6_hmac_exit(void)
	417	{
	418	struct seg6_hmac_algo *algo = NULL;
	419	int i, alg_count, cpu;
	420
6391c4f6	421	alg_count = ARRAY_SIZE(hmac_algos);
bf355b8d DL	422	for (i = 0; i < alg_count; i++) {
	423	algo = &hmac_algos[i];
	424	for_each_possible_cpu(cpu) {
	425	struct crypto_shash *tfm;
	426	struct shash_desc *shash;
	427
	428	shash = *per_cpu_ptr(algo->shashs, cpu);
	429	kfree(shash);
	430	tfm = *per_cpu_ptr(algo->tfms, cpu);
	431	crypto_free_shash(tfm);
	432	}
	433	free_percpu(algo->tfms);
	434	free_percpu(algo->shashs);
	435	}
	436	}
	437	EXPORT_SYMBOL(seg6_hmac_exit);
	438
	439	void __net_exit seg6_hmac_net_exit(struct net *net)
	440	{
	441	struct seg6_pernet_data *sdata = seg6_pernet(net);
	442
	443	rhashtable_free_and_destroy(&sdata->hmac_infos, seg6_free_hi, NULL);
	444	}
	445	EXPORT_SYMBOL(seg6_hmac_net_exit);