/*
- * Copyright (c) 2008 Apple Inc. All rights reserved.
+ * Copyright (c) 2008-2016 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
#include <sys/queue.h>
#include <sys/syslog.h>
#include <sys/mbuf.h>
+#include <sys/mcache.h>
#include <kern/locks.h>
#include <netinet6/esp.h>
#include <netinet6/esp_rijndael.h>
-#include <crypto/aes/aes.h>
+#include <libkern/crypto/aes.h>
#include <netkey/key.h>
#include <net/net_osdep.h>
+#define MAX_REALIGN_LEN 2000
#define AES_BLOCKLEN 16
+#define ESP_GCM_SALT_LEN 4 // RFC 4106 Section 4
+#define ESP_GCM_IVLEN 8
+#define ESP_GCM_ALIGN 16
extern lck_mtx_t *sadb_mutex;
+typedef struct {
+ ccgcm_ctx *decrypt;
+ ccgcm_ctx *encrypt;
+ ccgcm_ctx ctxt[0];
+} aes_gcm_ctx;
+
int
esp_aes_schedlen(
__unused const struct esp_algorithm *algo)
int
-esp_cbc_decrypt_aes(m, off, sav, algo, ivlen)
- struct mbuf *m;
- size_t off;
- struct secasvar *sav;
- const struct esp_algorithm *algo;
- int ivlen;
+esp_cbc_decrypt_aes(
+ struct mbuf *m,
+ size_t off,
+ struct secasvar *sav,
+ const struct esp_algorithm *algo,
+ int ivlen)
{
struct mbuf *s;
struct mbuf *d, *d0, *dp;
int soff; /* offset from the head of chain, to head of this mbuf */
int sn, dn; /* offset from the head of the mbuf, to meat */
size_t ivoff, bodyoff;
- u_int8_t iv[AES_BLOCKLEN], *dptr;
- u_int8_t sbuf[AES_BLOCKLEN], *sp;
+ u_int8_t iv[AES_BLOCKLEN] __attribute__((aligned(4))), *dptr;
+ u_int8_t sbuf[AES_BLOCKLEN] __attribute__((aligned(4))), *sp, *sp_unaligned, *sp_aligned = NULL;
struct mbuf *scut;
int scutoff;
int i, len;
d0 = d;
if (dp)
dp->m_next = d;
+
+ // try to make mbuf data aligned
+ if (!IPSEC_IS_P2ALIGNED(d->m_data)) {
+ m_adj(d, IPSEC_GET_P2UNALIGNED_OFS(d->m_data));
+ }
+
d->m_len = M_TRAILINGSPACE(d);
d->m_len -= d->m_len % AES_BLOCKLEN;
if (d->m_len > i)
len = d->m_len - dn;
/* decrypt */
+ // check input pointer alignment and use a separate aligned buffer (if sp is unaligned on 4-byte boundary).
+ if (IPSEC_IS_P2ALIGNED(sp)) {
+ sp_unaligned = NULL;
+ } else {
+ sp_unaligned = sp;
+ if (len > MAX_REALIGN_LEN) {
+ return ENOBUFS;
+ }
+ if (sp_aligned == NULL) {
+ sp_aligned = (u_int8_t *)_MALLOC(MAX_REALIGN_LEN, M_SECA, M_DONTWAIT);
+ if (sp_aligned == NULL)
+ return ENOMEM;
+ }
+ sp = sp_aligned;
+ memcpy(sp, sp_unaligned, len);
+ }
+ // no need to check output pointer alignment
aes_decrypt_cbc(sp, iv, len >> 4, dptr + dn,
(aes_decrypt_ctx*)(&(((aes_ctx*)sav->sched)->decrypt)));
+ // update unaligned pointers
+ if (!IPSEC_IS_P2ALIGNED(sp_unaligned)) {
+ sp = sp_unaligned;
+ }
+
/* udpate offsets */
sn += len;
dn += len;
scut->m_len = scutoff;
scut->m_next = d0;
+ // free memory
+ if (sp_aligned != NULL) {
+ FREE(sp_aligned, M_SECA);
+ sp_aligned = NULL;
+ }
+
/* just in case */
bzero(iv, sizeof(iv));
bzero(sbuf, sizeof(sbuf));
int soff; /* offset from the head of chain, to head of this mbuf */
int sn, dn; /* offset from the head of the mbuf, to meat */
size_t ivoff, bodyoff;
- u_int8_t *ivp, *dptr;
- u_int8_t sbuf[AES_BLOCKLEN], *sp;
+ u_int8_t *ivp, *dptr, *ivp_unaligned;
+ u_int8_t sbuf[AES_BLOCKLEN] __attribute__((aligned(4))), *sp, *sp_unaligned, *sp_aligned = NULL;
+ u_int8_t ivp_aligned_buf[AES_BLOCKLEN] __attribute__((aligned(4)));
struct mbuf *scut;
int scutoff;
int i, len;
if (dp)
dp->m_next = d;
+ // try to make mbuf data aligned
+ if (!IPSEC_IS_P2ALIGNED(d->m_data)) {
+ m_adj(d, IPSEC_GET_P2UNALIGNED_OFS(d->m_data));
+ }
+
d->m_len = M_TRAILINGSPACE(d);
d->m_len -= d->m_len % AES_BLOCKLEN;
if (d->m_len > i)
len = d->m_len - dn;
/* encrypt */
+ // check input pointer alignment and use a separate aligned buffer (if sp is not aligned on 4-byte boundary).
+ if (IPSEC_IS_P2ALIGNED(sp)) {
+ sp_unaligned = NULL;
+ } else {
+ sp_unaligned = sp;
+ if (len > MAX_REALIGN_LEN) {
+ return ENOBUFS;
+ }
+ if (sp_aligned == NULL) {
+ sp_aligned = (u_int8_t *)_MALLOC(MAX_REALIGN_LEN, M_SECA, M_DONTWAIT);
+ if (sp_aligned == NULL)
+ return ENOMEM;
+ }
+ sp = sp_aligned;
+ memcpy(sp, sp_unaligned, len);
+ }
+ // check ivp pointer alignment and use a separate aligned buffer (if ivp is not aligned on 4-byte boundary).
+ if (IPSEC_IS_P2ALIGNED(ivp)) {
+ ivp_unaligned = NULL;
+ } else {
+ ivp_unaligned = ivp;
+ ivp = ivp_aligned_buf;
+ memcpy(ivp, ivp_unaligned, AES_BLOCKLEN);
+ }
+ // no need to check output pointer alignment
aes_encrypt_cbc(sp, ivp, len >> 4, dptr + dn,
(aes_encrypt_ctx*)(&(((aes_ctx*)sav->sched)->encrypt)));
+ // update unaligned pointers
+ if (!IPSEC_IS_P2ALIGNED(sp_unaligned)) {
+ sp = sp_unaligned;
+ }
+ if (!IPSEC_IS_P2ALIGNED(ivp_unaligned)) {
+ ivp = ivp_unaligned;
+ }
+
/* update offsets */
sn += len;
dn += len;
soff += s->m_len;
s = s->m_next;
}
-
}
/* free un-needed source mbufs and add dest mbufs to chain */
m_freem(scut->m_next);
scut->m_len = scutoff;
scut->m_next = d0;
+
+ // free memory
+ if (sp_aligned != NULL) {
+ FREE(sp_aligned, M_SECA);
+ sp_aligned = NULL;
+ }
/* just in case */
bzero(sbuf, sizeof(sbuf));
return 0;
}
+
+int
+esp_gcm_schedlen(
+ __unused const struct esp_algorithm *algo)
+{
+ return (sizeof(aes_gcm_ctx) + aes_decrypt_get_ctx_size_gcm() + aes_encrypt_get_ctx_size_gcm() + ESP_GCM_ALIGN);
+}
+
+int
+esp_gcm_schedule( __unused const struct esp_algorithm *algo,
+ struct secasvar *sav)
+{
+ lck_mtx_assert(sadb_mutex, LCK_MTX_ASSERT_OWNED);
+ aes_gcm_ctx *ctx = (aes_gcm_ctx*)P2ROUNDUP(sav->sched, ESP_GCM_ALIGN);
+ u_int ivlen = sav->ivlen;
+ unsigned char nonce[ESP_GCM_SALT_LEN+ivlen];
+ int rc;
+
+ ctx->decrypt = &ctx->ctxt[0];
+ ctx->encrypt = &ctx->ctxt[aes_decrypt_get_ctx_size_gcm() / sizeof(ccgcm_ctx)];
+
+ rc = aes_decrypt_key_gcm((const unsigned char *) _KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc)-ESP_GCM_SALT_LEN, ctx->decrypt);
+ if (rc) {
+ return (rc);
+ }
+
+ bzero(nonce, ESP_GCM_SALT_LEN + ivlen);
+ memcpy(nonce, _KEYBUF(sav->key_enc)+_KEYLEN(sav->key_enc)-ESP_GCM_SALT_LEN, ESP_GCM_SALT_LEN);
+ memcpy(nonce+ESP_GCM_SALT_LEN, sav->iv, ivlen);
+
+ rc = aes_encrypt_key_with_iv_gcm((const unsigned char *) _KEYBUF(sav->key_enc), _KEYLEN(sav->key_enc)-ESP_GCM_SALT_LEN, nonce, ctx->encrypt);
+ if (rc) {
+ return (rc);
+ }
+
+ rc = aes_encrypt_reset_gcm(ctx->encrypt);
+ if (rc) {
+ return (rc);
+ }
+
+ return (rc);
+}
+
+int
+esp_gcm_encrypt_finalize(struct secasvar *sav,
+ unsigned char *tag, unsigned int tag_bytes)
+{
+ aes_gcm_ctx *ctx = (aes_gcm_ctx*)P2ROUNDUP(sav->sched, ESP_GCM_ALIGN);
+ return (aes_encrypt_finalize_gcm(tag, tag_bytes, ctx->encrypt));
+}
+
+int
+esp_gcm_decrypt_finalize(struct secasvar *sav,
+ unsigned char *tag, unsigned int tag_bytes)
+{
+ aes_gcm_ctx *ctx = (aes_gcm_ctx*)P2ROUNDUP(sav->sched, ESP_GCM_ALIGN);
+ return (aes_decrypt_finalize_gcm(tag, tag_bytes, ctx->decrypt));
+}
+
+int
+esp_gcm_encrypt_aes(
+ struct mbuf *m,
+ size_t off,
+ __unused size_t plen,
+ struct secasvar *sav,
+ const struct esp_algorithm *algo __unused,
+ int ivlen)
+{
+ struct mbuf *s;
+ struct mbuf *d, *d0, *dp;
+ int soff; /* offset from the head of chain, to head of this mbuf */
+ int sn, dn; /* offset from the head of the mbuf, to meat */
+ size_t ivoff, bodyoff;
+ u_int8_t *dptr, *sp, *sp_unaligned, *sp_aligned = NULL;
+ aes_gcm_ctx *ctx;
+ struct mbuf *scut;
+ int scutoff;
+ int i, len;
+ unsigned char nonce[ESP_GCM_SALT_LEN+ivlen];
+
+ if (ivlen != ESP_GCM_IVLEN) {
+ ipseclog((LOG_ERR, "%s: unsupported ivlen %d\n", __FUNCTION__, ivlen));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1827 */
+ ivoff = off + sizeof(struct esp);
+ bodyoff = off + sizeof(struct esp) + ivlen;
+ } else {
+ ivoff = off + sizeof(struct newesp);
+ bodyoff = off + sizeof(struct newesp) + ivlen;
+ }
+
+ bzero(nonce, ESP_GCM_SALT_LEN+ivlen);
+ /* generate new iv */
+ ctx = (aes_gcm_ctx *)P2ROUNDUP(sav->sched, ESP_GCM_ALIGN);
+
+ if (aes_encrypt_reset_gcm(ctx->encrypt)) {
+ ipseclog((LOG_ERR, "%s: gcm reset failure\n", __FUNCTION__));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ if (aes_encrypt_inc_iv_gcm((unsigned char *)nonce, ctx->encrypt)) {
+ ipseclog((LOG_ERR, "%s: iv generation failure\n", __FUNCTION__));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ /*
+ * The IV is now generated within corecrypto and
+ * is provided to ESP using aes_encrypt_inc_iv_gcm().
+ * This makes the sav->iv redundant and is no longer
+ * used in GCM operations. But we still copy the IV
+ * back to sav->iv to ensure that any future code reading
+ * this value will get the latest IV.
+ */
+ memcpy(sav->iv, (nonce + ESP_GCM_SALT_LEN), ivlen);
+ m_copyback(m, ivoff, ivlen, sav->iv);
+ bzero(nonce, ESP_GCM_SALT_LEN+ivlen);
+
+ if (m->m_pkthdr.len < bodyoff) {
+ ipseclog((LOG_ERR, "%s: bad len %d/%lu\n", __FUNCTION__,
+ m->m_pkthdr.len, (u_int32_t)bodyoff));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ /* Set Additional Authentication Data */
+ if (!(sav->flags & SADB_X_EXT_OLD)) {
+ struct newesp esp;
+ m_copydata(m, off, sizeof(esp), (caddr_t) &esp);
+ if (aes_encrypt_aad_gcm((unsigned char*)&esp, sizeof(esp), ctx->encrypt)) {
+ ipseclog((LOG_ERR, "%s: packet decryption AAD failure\n", __FUNCTION__));
+ m_freem(m);
+ return EINVAL;
+ }
+ }
+
+ s = m;
+ soff = sn = dn = 0;
+ d = d0 = dp = NULL;
+ sp = dptr = NULL;
+
+ /* skip headers/IV */
+ while (soff < bodyoff) {
+ if (soff + s->m_len > bodyoff) {
+ sn = bodyoff - soff;
+ break;
+ }
+
+ soff += s->m_len;
+ s = s->m_next;
+ }
+ scut = s;
+ scutoff = sn;
+
+ /* skip over empty mbuf */
+ while (s && s->m_len == 0)
+ s = s->m_next;
+
+ while (soff < m->m_pkthdr.len) {
+ /* source */
+ sp = mtod(s, u_int8_t *) + sn;
+ len = s->m_len - sn;
+
+ /* destination */
+ if (!d || (dn + len > d->m_len)) {
+ if (d)
+ dp = d;
+ MGET(d, M_DONTWAIT, MT_DATA);
+ i = m->m_pkthdr.len - (soff + sn);
+ if (d && i > MLEN) {
+ MCLGET(d, M_DONTWAIT);
+ if ((d->m_flags & M_EXT) == 0) {
+ d = m_mbigget(d, M_DONTWAIT);
+ if ((d->m_flags & M_EXT) == 0) {
+ m_free(d);
+ d = NULL;
+ }
+ }
+ }
+ if (!d) {
+ m_freem(m);
+ if (d0)
+ m_freem(d0);
+ return ENOBUFS;
+ }
+ if (!d0)
+ d0 = d;
+ if (dp)
+ dp->m_next = d;
+
+ // try to make mbuf data aligned
+ if (!IPSEC_IS_P2ALIGNED(d->m_data)) {
+ m_adj(d, IPSEC_GET_P2UNALIGNED_OFS(d->m_data));
+ }
+
+ d->m_len = M_TRAILINGSPACE(d);
+
+ if (d->m_len > i)
+ d->m_len = i;
+
+ dptr = mtod(d, u_int8_t *);
+ dn = 0;
+ }
+
+ /* adjust len if greater than space available */
+ if (len > d->m_len - dn)
+ len = d->m_len - dn;
+
+ /* encrypt */
+ // check input pointer alignment and use a separate aligned buffer (if sp is not aligned on 4-byte boundary).
+ if (IPSEC_IS_P2ALIGNED(sp)) {
+ sp_unaligned = NULL;
+ } else {
+ sp_unaligned = sp;
+ if (len > MAX_REALIGN_LEN) {
+ return ENOBUFS;
+ }
+ if (sp_aligned == NULL) {
+ sp_aligned = (u_int8_t *)_MALLOC(MAX_REALIGN_LEN, M_SECA, M_DONTWAIT);
+ if (sp_aligned == NULL)
+ return ENOMEM;
+ }
+ sp = sp_aligned;
+ memcpy(sp, sp_unaligned, len);
+ }
+
+ if (aes_encrypt_gcm(sp, len, dptr+dn, ctx->encrypt)) {
+ ipseclog((LOG_ERR, "%s: failed to encrypt\n", __FUNCTION__));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ // update unaligned pointers
+ if (!IPSEC_IS_P2ALIGNED(sp_unaligned)) {
+ sp = sp_unaligned;
+ }
+
+ /* update offsets */
+ sn += len;
+ dn += len;
+
+ /* find the next source block and skip empty mbufs */
+ while (s && sn >= s->m_len) {
+ sn -= s->m_len;
+ soff += s->m_len;
+ s = s->m_next;
+ }
+ }
+
+ /* free un-needed source mbufs and add dest mbufs to chain */
+ m_freem(scut->m_next);
+ scut->m_len = scutoff;
+ scut->m_next = d0;
+
+ // free memory
+ if (sp_aligned != NULL) {
+ FREE(sp_aligned, M_SECA);
+ sp_aligned = NULL;
+ }
+
+ return 0;
+}
+
+int
+esp_gcm_decrypt_aes(
+ struct mbuf *m,
+ size_t off,
+ struct secasvar *sav,
+ const struct esp_algorithm *algo __unused,
+ int ivlen)
+{
+ struct mbuf *s;
+ struct mbuf *d, *d0, *dp;
+ int soff; /* offset from the head of chain, to head of this mbuf */
+ int sn, dn; /* offset from the head of the mbuf, to meat */
+ size_t ivoff, bodyoff;
+ u_int8_t iv[ESP_GCM_IVLEN] __attribute__((aligned(4))), *dptr;
+ u_int8_t *sp, *sp_unaligned, *sp_aligned = NULL;
+ aes_gcm_ctx *ctx;
+ struct mbuf *scut;
+ int scutoff;
+ int i, len;
+ unsigned char nonce[ESP_GCM_SALT_LEN+ivlen];
+
+ if (ivlen != ESP_GCM_IVLEN) {
+ ipseclog((LOG_ERR, "%s: unsupported ivlen %d\n", __FUNCTION__, ivlen));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ if (sav->flags & SADB_X_EXT_OLD) {
+ /* RFC 1827 */
+ ivoff = off + sizeof(struct esp);
+ bodyoff = off + sizeof(struct esp) + ivlen;
+ } else {
+ ivoff = off + sizeof(struct newesp);
+ bodyoff = off + sizeof(struct newesp) + ivlen;
+ }
+
+ if (m->m_pkthdr.len < bodyoff) {
+ ipseclog((LOG_ERR, "%s: bad len %d/%lu\n", __FUNCTION__,
+ m->m_pkthdr.len, (u_int32_t)bodyoff));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ /* grab iv */
+ m_copydata(m, ivoff, ivlen, (caddr_t) iv);
+
+ /* Set IV */
+ memcpy(nonce, _KEYBUF(sav->key_enc)+_KEYLEN(sav->key_enc)-ESP_GCM_SALT_LEN, ESP_GCM_SALT_LEN);
+ memcpy(nonce+ESP_GCM_SALT_LEN, iv, ivlen);
+
+ ctx = (aes_gcm_ctx *)P2ROUNDUP(sav->sched, ESP_GCM_ALIGN);
+ if (aes_decrypt_set_iv_gcm(nonce, sizeof(nonce), ctx->decrypt)) {
+ ipseclog((LOG_ERR, "%s: failed to set IV\n", __FUNCTION__));
+ m_freem(m);
+ bzero(nonce, sizeof(nonce));
+ return EINVAL;
+ }
+ bzero(nonce, sizeof(nonce));
+
+ /* Set Additional Authentication Data */
+ if (!(sav->flags & SADB_X_EXT_OLD)) {
+ struct newesp esp;
+ m_copydata(m, off, sizeof(esp), (caddr_t) &esp);
+ if (aes_decrypt_aad_gcm((unsigned char*)&esp, sizeof(esp), ctx->decrypt)) {
+ ipseclog((LOG_ERR, "%s: packet decryption AAD failure\n", __FUNCTION__));
+ return EINVAL;
+ }
+ }
+
+ s = m;
+ soff = sn = dn = 0;
+ d = d0 = dp = NULL;
+ sp = dptr = NULL;
+
+ /* skip header/IV offset */
+ while (soff < bodyoff) {
+ if (soff + s->m_len > bodyoff) {
+ sn = bodyoff - soff;
+ break;
+ }
+
+ soff += s->m_len;
+ s = s->m_next;
+ }
+ scut = s;
+ scutoff = sn;
+
+ /* skip over empty mbuf */
+ while (s && s->m_len == 0)
+ s = s->m_next;
+
+ while (soff < m->m_pkthdr.len) {
+ /* source */
+ sp = mtod(s, u_int8_t *) + sn;
+ len = s->m_len - sn;
+
+ /* destination */
+ if (!d || (dn + len > d->m_len)) {
+ if (d)
+ dp = d;
+ MGET(d, M_DONTWAIT, MT_DATA);
+ i = m->m_pkthdr.len - (soff + sn);
+ if (d && i > MLEN) {
+ MCLGET(d, M_DONTWAIT);
+ if ((d->m_flags & M_EXT) == 0) {
+ d = m_mbigget(d, M_DONTWAIT);
+ if ((d->m_flags & M_EXT) == 0) {
+ m_free(d);
+ d = NULL;
+ }
+ }
+ }
+ if (!d) {
+ m_freem(m);
+ if (d0)
+ m_freem(d0);
+ return ENOBUFS;
+ }
+ if (!d0)
+ d0 = d;
+ if (dp)
+ dp->m_next = d;
+
+ // try to make mbuf data aligned
+ if (!IPSEC_IS_P2ALIGNED(d->m_data)) {
+ m_adj(d, IPSEC_GET_P2UNALIGNED_OFS(d->m_data));
+ }
+
+ d->m_len = M_TRAILINGSPACE(d);
+
+ if (d->m_len > i)
+ d->m_len = i;
+
+ dptr = mtod(d, u_int8_t *);
+ dn = 0;
+ }
+
+ /* adjust len if greater than space available in dest */
+ if (len > d->m_len - dn)
+ len = d->m_len - dn;
+
+ /* Decrypt */
+ // check input pointer alignment and use a separate aligned buffer (if sp is unaligned on 4-byte boundary).
+ if (IPSEC_IS_P2ALIGNED(sp)) {
+ sp_unaligned = NULL;
+ } else {
+ sp_unaligned = sp;
+ if (len > MAX_REALIGN_LEN) {
+ return ENOBUFS;
+ }
+ if (sp_aligned == NULL) {
+ sp_aligned = (u_int8_t *)_MALLOC(MAX_REALIGN_LEN, M_SECA, M_DONTWAIT);
+ if (sp_aligned == NULL)
+ return ENOMEM;
+ }
+ sp = sp_aligned;
+ memcpy(sp, sp_unaligned, len);
+ }
+ // no need to check output pointer alignment
+
+ if (aes_decrypt_gcm(sp, len, dptr + dn, ctx->decrypt)) {
+ ipseclog((LOG_ERR, "%s: failed to decrypt\n", __FUNCTION__));
+ m_freem(m);
+ return EINVAL;
+ }
+
+ // update unaligned pointers
+ if (!IPSEC_IS_P2ALIGNED(sp_unaligned)) {
+ sp = sp_unaligned;
+ }
+
+ /* udpate offsets */
+ sn += len;
+ dn += len;
+
+ /* find the next source block */
+ while (s && sn >= s->m_len) {
+ sn -= s->m_len;
+ soff += s->m_len;
+ s = s->m_next;
+ }
+ }
+
+ /* free un-needed source mbufs and add dest mbufs to chain */
+ m_freem(scut->m_next);
+ scut->m_len = scutoff;
+ scut->m_next = d0;
+
+ // free memory
+ if (sp_aligned != NULL) {
+ FREE(sp_aligned, M_SECA);
+ sp_aligned = NULL;
+ }
+
+ /* just in case */
+ bzero(iv, sizeof(iv));
+
+ return 0;
+}
projects / apple / xnu.git / blobdiff