--- /dev/null
+/*
+ * Octeon Crypto for OCF
+ *
+ * Written by David McCullough <david_mccullough@mcafee.com>
+ * Copyright (C) 2009-2010 David McCullough
+ *
+ * LICENSE TERMS
+ *
+ * The free distribution and use of this software in both source and binary
+ * form is allowed (with or without changes) provided that:
+ *
+ * 1. distributions of this source code include the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ *
+ * 2. distributions in binary form include the above copyright
+ * notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other associated materials;
+ *
+ * 3. the copyright holder's name is not used to endorse products
+ * built using this software without specific written permission.
+ *
+ * DISCLAIMER
+ *
+ * This software is provided 'as is' with no explicit or implied warranties
+ * in respect of its properties, including, but not limited to, correctness
+ * and/or fitness for purpose.
+ * ---------------------------------------------------------------------------
+ */
+
+#ifndef AUTOCONF_INCLUDED
+#include <linux/config.h>
+#endif
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/crypto.h>
+#include <linux/mm.h>
+#include <linux/skbuff.h>
+#include <linux/random.h>
+#include <linux/scatterlist.h>
+
+#include <cryptodev.h>
+#include <uio.h>
+
+struct {
+ softc_device_decl sc_dev;
+} octo_softc;
+
+#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK)
+
+struct octo_sess {
+ int octo_encalg;
+ #define MAX_CIPHER_KEYLEN 64
+ char octo_enckey[MAX_CIPHER_KEYLEN];
+ int octo_encklen;
+
+ int octo_macalg;
+ #define MAX_HASH_KEYLEN 64
+ char octo_mackey[MAX_HASH_KEYLEN];
+ int octo_macklen;
+ int octo_mackey_set;
+
+ int octo_mlen;
+ int octo_ivsize;
+
+#if 0
+ int (*octo_decrypt)(struct scatterlist *sg, int sg_len,
+ uint8_t *key, int key_len, uint8_t * iv,
+ uint64_t *hminner, uint64_t *hmouter);
+
+ int (*octo_encrypt)(struct scatterlist *sg, int sg_len,
+ uint8_t *key, int key_len, uint8_t * iv,
+ uint64_t *hminner, uint64_t *hmouter);
+#else
+ int (*octo_encrypt)(struct octo_sess *od,
+ struct scatterlist *sg, int sg_len,
+ int auth_off, int auth_len,
+ int crypt_off, int crypt_len,
+ int icv_off, uint8_t *ivp);
+ int (*octo_decrypt)(struct octo_sess *od,
+ struct scatterlist *sg, int sg_len,
+ int auth_off, int auth_len,
+ int crypt_off, int crypt_len,
+ int icv_off, uint8_t *ivp);
+#endif
+
+ uint64_t octo_hminner[3];
+ uint64_t octo_hmouter[3];
+};
+
+int32_t octo_id = -1;
+module_param(octo_id, int, 0444);
+MODULE_PARM_DESC(octo_id, "Read-Only OCF ID for cryptocteon driver");
+
+static struct octo_sess **octo_sessions = NULL;
+static u_int32_t octo_sesnum = 0;
+
+static int octo_process(device_t, struct cryptop *, int);
+static int octo_newsession(device_t, u_int32_t *, struct cryptoini *);
+static int octo_freesession(device_t, u_int64_t);
+
+static device_method_t octo_methods = {
+ /* crypto device methods */
+ DEVMETHOD(cryptodev_newsession, octo_newsession),
+ DEVMETHOD(cryptodev_freesession,octo_freesession),
+ DEVMETHOD(cryptodev_process, octo_process),
+};
+
+#define debug octo_debug
+int octo_debug = 0;
+module_param(octo_debug, int, 0644);
+MODULE_PARM_DESC(octo_debug, "Enable debug");
+
+
+#include "cavium_crypto.c"
+
+
+/*
+ * Generate a new octo session. We artifically limit it to a single
+ * hash/cipher or hash-cipher combo just to make it easier, most callers
+ * do not expect more than this anyway.
+ */
+static int
+octo_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri)
+{
+ struct cryptoini *c, *encini = NULL, *macini = NULL;
+ struct octo_sess **ocd;
+ int i;
+
+ dprintk("%s()\n", __FUNCTION__);
+ if (sid == NULL || cri == NULL) {
+ dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__);
+ return EINVAL;
+ }
+
+ /*
+ * To keep it simple, we only handle hash, cipher or hash/cipher in a
+ * session, you cannot currently do multiple ciphers/hashes in one
+ * session even though it would be possibel to code this driver to
+ * handle it.
+ */
+ for (i = 0, c = cri; c && i < 2; i++) {
+ if (c->cri_alg == CRYPTO_MD5_HMAC ||
+ c->cri_alg == CRYPTO_SHA1_HMAC ||
+ c->cri_alg == CRYPTO_NULL_HMAC) {
+ if (macini) {
+ break;
+ }
+ macini = c;
+ }
+ if (c->cri_alg == CRYPTO_DES_CBC ||
+ c->cri_alg == CRYPTO_3DES_CBC ||
+ c->cri_alg == CRYPTO_AES_CBC ||
+ c->cri_alg == CRYPTO_NULL_CBC) {
+ if (encini) {
+ break;
+ }
+ encini = c;
+ }
+ c = c->cri_next;
+ }
+ if (!macini && !encini) {
+ dprintk("%s,%d - EINVAL bad cipher/hash or combination\n",
+ __FILE__, __LINE__);
+ return EINVAL;
+ }
+ if (c) {
+ dprintk("%s,%d - EINVAL cannot handle chained cipher/hash combos\n",
+ __FILE__, __LINE__);
+ return EINVAL;
+ }
+
+ /*
+ * So we have something we can do, lets setup the session
+ */
+
+ if (octo_sessions) {
+ for (i = 1; i < octo_sesnum; i++)
+ if (octo_sessions[i] == NULL)
+ break;
+ } else
+ i = 1; /* NB: to silence compiler warning */
+
+ if (octo_sessions == NULL || i == octo_sesnum) {
+ if (octo_sessions == NULL) {
+ i = 1; /* We leave octo_sessions[0] empty */
+ octo_sesnum = CRYPTO_SW_SESSIONS;
+ } else
+ octo_sesnum *= 2;
+
+ ocd = kmalloc(octo_sesnum * sizeof(struct octo_sess *), SLAB_ATOMIC);
+ if (ocd == NULL) {
+ /* Reset session number */
+ if (octo_sesnum == CRYPTO_SW_SESSIONS)
+ octo_sesnum = 0;
+ else
+ octo_sesnum /= 2;
+ dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__);
+ return ENOBUFS;
+ }
+ memset(ocd, 0, octo_sesnum * sizeof(struct octo_sess *));
+
+ /* Copy existing sessions */
+ if (octo_sessions) {
+ memcpy(ocd, octo_sessions,
+ (octo_sesnum / 2) * sizeof(struct octo_sess *));
+ kfree(octo_sessions);
+ }
+
+ octo_sessions = ocd;
+ }
+
+ ocd = &octo_sessions[i];
+ *sid = i;
+
+
+ *ocd = (struct octo_sess *) kmalloc(sizeof(struct octo_sess), SLAB_ATOMIC);
+ if (*ocd == NULL) {
+ octo_freesession(NULL, i);
+ dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__);
+ return ENOBUFS;
+ }
+ memset(*ocd, 0, sizeof(struct octo_sess));
+
+ if (encini && encini->cri_key) {
+ (*ocd)->octo_encklen = (encini->cri_klen + 7) / 8;
+ memcpy((*ocd)->octo_enckey, encini->cri_key, (*ocd)->octo_encklen);
+ }
+
+ if (macini && macini->cri_key) {
+ (*ocd)->octo_macklen = (macini->cri_klen + 7) / 8;
+ memcpy((*ocd)->octo_mackey, macini->cri_key, (*ocd)->octo_macklen);
+ }
+
+ (*ocd)->octo_mlen = 0;
+ if (encini && encini->cri_mlen)
+ (*ocd)->octo_mlen = encini->cri_mlen;
+ else if (macini && macini->cri_mlen)
+ (*ocd)->octo_mlen = macini->cri_mlen;
+ else
+ (*ocd)->octo_mlen = 12;
+
+ /*
+ * point c at the enc if it exists, otherwise the mac
+ */
+ c = encini ? encini : macini;
+
+ switch (c->cri_alg) {
+ case CRYPTO_DES_CBC:
+ case CRYPTO_3DES_CBC:
+ (*ocd)->octo_ivsize = 8;
+ switch (macini ? macini->cri_alg : -1) {
+ case CRYPTO_MD5_HMAC:
+ (*ocd)->octo_encrypt = octo_des_cbc_md5_encrypt;
+ (*ocd)->octo_decrypt = octo_des_cbc_md5_decrypt;
+ octo_calc_hash(0, macini->cri_key, (*ocd)->octo_hminner,
+ (*ocd)->octo_hmouter);
+ break;
+ case CRYPTO_SHA1_HMAC:
+ (*ocd)->octo_encrypt = octo_des_cbc_sha1_encrypt;
+ (*ocd)->octo_decrypt = octo_des_cbc_sha1_encrypt;
+ octo_calc_hash(1, macini->cri_key, (*ocd)->octo_hminner,
+ (*ocd)->octo_hmouter);
+ break;
+ case -1:
+ (*ocd)->octo_encrypt = octo_des_cbc_encrypt;
+ (*ocd)->octo_decrypt = octo_des_cbc_decrypt;
+ break;
+ default:
+ octo_freesession(NULL, i);
+ dprintk("%s,%d: EINVALn", __FILE__, __LINE__);
+ return EINVAL;
+ }
+ break;
+ case CRYPTO_AES_CBC:
+ (*ocd)->octo_ivsize = 16;
+ switch (macini ? macini->cri_alg : -1) {
+ case CRYPTO_MD5_HMAC:
+ (*ocd)->octo_encrypt = octo_aes_cbc_md5_encrypt;
+ (*ocd)->octo_decrypt = octo_aes_cbc_md5_decrypt;
+ octo_calc_hash(0, macini->cri_key, (*ocd)->octo_hminner,
+ (*ocd)->octo_hmouter);
+ break;
+ case CRYPTO_SHA1_HMAC:
+ (*ocd)->octo_encrypt = octo_aes_cbc_sha1_encrypt;
+ (*ocd)->octo_decrypt = octo_aes_cbc_sha1_decrypt;
+ octo_calc_hash(1, macini->cri_key, (*ocd)->octo_hminner,
+ (*ocd)->octo_hmouter);
+ break;
+ case -1:
+ (*ocd)->octo_encrypt = octo_aes_cbc_encrypt;
+ (*ocd)->octo_decrypt = octo_aes_cbc_decrypt;
+ break;
+ default:
+ octo_freesession(NULL, i);
+ dprintk("%s,%d: EINVALn", __FILE__, __LINE__);
+ return EINVAL;
+ }
+ break;
+ case CRYPTO_MD5_HMAC:
+ (*ocd)->octo_encrypt = octo_null_md5_encrypt;
+ (*ocd)->octo_decrypt = octo_null_md5_encrypt;
+ octo_calc_hash(0, macini->cri_key, (*ocd)->octo_hminner,
+ (*ocd)->octo_hmouter);
+ break;
+ case CRYPTO_SHA1_HMAC:
+ (*ocd)->octo_encrypt = octo_null_sha1_encrypt;
+ (*ocd)->octo_decrypt = octo_null_sha1_encrypt;
+ octo_calc_hash(1, macini->cri_key, (*ocd)->octo_hminner,
+ (*ocd)->octo_hmouter);
+ break;
+ default:
+ octo_freesession(NULL, i);
+ dprintk("%s,%d: EINVALn", __FILE__, __LINE__);
+ return EINVAL;
+ }
+
+ (*ocd)->octo_encalg = encini ? encini->cri_alg : -1;
+ (*ocd)->octo_macalg = macini ? macini->cri_alg : -1;
+
+ return 0;
+}
+
+/*
+ * Free a session.
+ */
+static int
+octo_freesession(device_t dev, u_int64_t tid)
+{
+ u_int32_t sid = CRYPTO_SESID2LID(tid);
+
+ dprintk("%s()\n", __FUNCTION__);
+ if (sid > octo_sesnum || octo_sessions == NULL ||
+ octo_sessions[sid] == NULL) {
+ dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
+ return(EINVAL);
+ }
+
+ /* Silently accept and return */
+ if (sid == 0)
+ return(0);
+
+ if (octo_sessions[sid])
+ kfree(octo_sessions[sid]);
+ octo_sessions[sid] = NULL;
+ return 0;
+}
+
+/*
+ * Process a request.
+ */
+static int
+octo_process(device_t dev, struct cryptop *crp, int hint)
+{
+ struct cryptodesc *crd;
+ struct octo_sess *od;
+ u_int32_t lid;
+#define SCATTERLIST_MAX 16
+ struct scatterlist sg[SCATTERLIST_MAX];
+ int sg_num, sg_len;
+ struct sk_buff *skb = NULL;
+ struct uio *uiop = NULL;
+ struct cryptodesc *enccrd = NULL, *maccrd = NULL;
+ unsigned char *ivp = NULL;
+ unsigned char iv_data[HASH_MAX_LEN];
+ int auth_off = 0, auth_len = 0, crypt_off = 0, crypt_len = 0, icv_off = 0;
+
+ dprintk("%s()\n", __FUNCTION__);
+ /* Sanity check */
+ if (crp == NULL) {
+ dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
+ return EINVAL;
+ }
+
+ crp->crp_etype = 0;
+
+ if (crp->crp_desc == NULL || crp->crp_buf == NULL) {
+ dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__);
+ crp->crp_etype = EINVAL;
+ goto done;
+ }
+
+ lid = crp->crp_sid & 0xffffffff;
+ if (lid >= octo_sesnum || lid == 0 || octo_sessions == NULL ||
+ octo_sessions[lid] == NULL) {
+ crp->crp_etype = ENOENT;
+ dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__);
+ goto done;
+ }
+ od = octo_sessions[lid];
+
+ /*
+ * do some error checking outside of the loop for SKB and IOV processing
+ * this leaves us with valid skb or uiop pointers for later
+ */
+ if (crp->crp_flags & CRYPTO_F_SKBUF) {
+ skb = (struct sk_buff *) crp->crp_buf;
+ if (skb_shinfo(skb)->nr_frags >= SCATTERLIST_MAX) {
+ printk("%s,%d: %d nr_frags > SCATTERLIST_MAX", __FILE__, __LINE__,
+ skb_shinfo(skb)->nr_frags);
+ goto done;
+ }
+ } else if (crp->crp_flags & CRYPTO_F_IOV) {
+ uiop = (struct uio *) crp->crp_buf;
+ if (uiop->uio_iovcnt > SCATTERLIST_MAX) {
+ printk("%s,%d: %d uio_iovcnt > SCATTERLIST_MAX", __FILE__, __LINE__,
+ uiop->uio_iovcnt);
+ goto done;
+ }
+ }
+
+ /* point our enccrd and maccrd appropriately */
+ crd = crp->crp_desc;
+ if (crd->crd_alg == od->octo_encalg) enccrd = crd;
+ if (crd->crd_alg == od->octo_macalg) maccrd = crd;
+ crd = crd->crd_next;
+ if (crd) {
+ if (crd->crd_alg == od->octo_encalg) enccrd = crd;
+ if (crd->crd_alg == od->octo_macalg) maccrd = crd;
+ crd = crd->crd_next;
+ }
+ if (crd) {
+ crp->crp_etype = EINVAL;
+ dprintk("%s,%d: ENOENT - descriptors do not match session\n",
+ __FILE__, __LINE__);
+ goto done;
+ }
+
+ if (enccrd) {
+ if (enccrd->crd_flags & CRD_F_IV_EXPLICIT) {
+ ivp = enccrd->crd_iv;
+ } else {
+ ivp = iv_data;
+ crypto_copydata(crp->crp_flags, crp->crp_buf,
+ enccrd->crd_inject, od->octo_ivsize, (caddr_t) ivp);
+ }
+
+ if (maccrd) {
+ auth_off = maccrd->crd_skip;
+ auth_len = maccrd->crd_len;
+ icv_off = maccrd->crd_inject;
+ }
+
+ crypt_off = enccrd->crd_skip;
+ crypt_len = enccrd->crd_len;
+ } else { /* if (maccrd) */
+ auth_off = maccrd->crd_skip;
+ auth_len = maccrd->crd_len;
+ icv_off = maccrd->crd_inject;
+ }
+
+
+ /*
+ * setup the SG list to cover the buffer
+ */
+ memset(sg, 0, sizeof(sg));
+ if (crp->crp_flags & CRYPTO_F_SKBUF) {
+ int i, len;
+
+ sg_num = 0;
+ sg_len = 0;
+
+ len = skb_headlen(skb);
+ sg_set_page(&sg[sg_num], virt_to_page(skb->data), len,
+ offset_in_page(skb->data));
+ sg_len += len;
+ sg_num++;
+
+ for (i = 0; i < skb_shinfo(skb)->nr_frags && sg_num < SCATTERLIST_MAX;
+ i++) {
+ len = skb_shinfo(skb)->frags[i].size;
+ sg_set_page(&sg[sg_num], skb_shinfo(skb)->frags[i].page,
+ len, skb_shinfo(skb)->frags[i].page_offset);
+ sg_len += len;
+ sg_num++;
+ }
+ } else if (crp->crp_flags & CRYPTO_F_IOV) {
+ int len;
+
+ sg_len = 0;
+ for (sg_num = 0; sg_len < crp->crp_ilen &&
+ sg_num < uiop->uio_iovcnt &&
+ sg_num < SCATTERLIST_MAX; sg_num++) {
+ len = uiop->uio_iov[sg_num].iov_len;
+ sg_set_page(&sg[sg_num],
+ virt_to_page(uiop->uio_iov[sg_num].iov_base), len,
+ offset_in_page(uiop->uio_iov[sg_num].iov_base));
+ sg_len += len;
+ }
+ } else {
+ sg_len = crp->crp_ilen;
+ sg_set_page(&sg[0], virt_to_page(crp->crp_buf), sg_len,
+ offset_in_page(crp->crp_buf));
+ sg_num = 1;
+ }
+
+
+ /*
+ * setup a new explicit key
+ */
+ if (enccrd) {
+ if (enccrd->crd_flags & CRD_F_KEY_EXPLICIT) {
+ od->octo_encklen = (enccrd->crd_klen + 7) / 8;
+ memcpy(od->octo_enckey, enccrd->crd_key, od->octo_encklen);
+ }
+ }
+ if (maccrd) {
+ if (maccrd->crd_flags & CRD_F_KEY_EXPLICIT) {
+ od->octo_macklen = (maccrd->crd_klen + 7) / 8;
+ memcpy(od->octo_mackey, maccrd->crd_key, od->octo_macklen);
+ od->octo_mackey_set = 0;
+ }
+ if (!od->octo_mackey_set) {
+ octo_calc_hash(maccrd->crd_alg == CRYPTO_MD5_HMAC ? 0 : 1,
+ maccrd->crd_key, od->octo_hminner, od->octo_hmouter);
+ od->octo_mackey_set = 1;
+ }
+ }
+
+
+ if (!enccrd || (enccrd->crd_flags & CRD_F_ENCRYPT))
+ (*od->octo_encrypt)(od, sg, sg_len,
+ auth_off, auth_len, crypt_off, crypt_len, icv_off, ivp);
+ else
+ (*od->octo_decrypt)(od, sg, sg_len,
+ auth_off, auth_len, crypt_off, crypt_len, icv_off, ivp);
+
+done:
+ crypto_done(crp);
+ return 0;
+}
+
+static int
+cryptocteon_init(void)
+{
+ dprintk("%s(%p)\n", __FUNCTION__, cryptocteon_init);
+
+ softc_device_init(&octo_softc, "cryptocteon", 0, octo_methods);
+
+ octo_id = crypto_get_driverid(softc_get_device(&octo_softc),
+ CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SYNC);
+ if (octo_id < 0) {
+ printk("Cryptocteon device cannot initialize!");
+ return -ENODEV;
+ }
+
+ crypto_register(octo_id, CRYPTO_MD5_HMAC, 0,0);
+ crypto_register(octo_id, CRYPTO_SHA1_HMAC, 0,0);
+ //crypto_register(octo_id, CRYPTO_MD5, 0,0);
+ //crypto_register(octo_id, CRYPTO_SHA1, 0,0);
+ crypto_register(octo_id, CRYPTO_DES_CBC, 0,0);
+ crypto_register(octo_id, CRYPTO_3DES_CBC, 0,0);
+ crypto_register(octo_id, CRYPTO_AES_CBC, 0,0);
+
+ return(0);
+}
+
+static void
+cryptocteon_exit(void)
+{
+ dprintk("%s()\n", __FUNCTION__);
+ crypto_unregister_all(octo_id);
+ octo_id = -1;
+}
+
+module_init(cryptocteon_init);
+module_exit(cryptocteon_exit);
+
+MODULE_LICENSE("BSD");
+MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>");
+MODULE_DESCRIPTION("Cryptocteon (OCF module for Cavium OCTEON crypto)");
projects / 15.05 / openwrt.git / blobdiff