linux-imx

/*

 *  SR-IPv6 implementation -- HMAC functions

 *

 *  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/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)

{