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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
273 lines
6.9 KiB
C
273 lines
6.9 KiB
C
/*
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* Cryptographic API.
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*
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* HMAC: Keyed-Hashing for Message Authentication (RFC2104).
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*
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* The HMAC implementation is derived from USAGI.
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* Copyright (c) 2002 Kazunori Miyazawa <miyazawa@linux-ipv6.org> / USAGI
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/internal/hash.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include <linux/string.h>
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struct hmac_ctx {
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struct crypto_shash *hash;
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};
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static inline void *align_ptr(void *p, unsigned int align)
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{
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return (void *)ALIGN((unsigned long)p, align);
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}
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static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm)
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{
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return align_ptr(crypto_shash_ctx_aligned(tfm) +
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crypto_shash_statesize(tfm) * 2,
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crypto_tfm_ctx_alignment());
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}
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static int hmac_setkey(struct crypto_shash *parent,
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const u8 *inkey, unsigned int keylen)
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{
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int bs = crypto_shash_blocksize(parent);
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int ds = crypto_shash_digestsize(parent);
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int ss = crypto_shash_statesize(parent);
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char *ipad = crypto_shash_ctx_aligned(parent);
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char *opad = ipad + ss;
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struct hmac_ctx *ctx = align_ptr(opad + ss,
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crypto_tfm_ctx_alignment());
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struct crypto_shash *hash = ctx->hash;
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struct {
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struct shash_desc shash;
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char ctx[crypto_shash_descsize(hash)];
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} desc;
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unsigned int i;
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desc.shash.tfm = hash;
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desc.shash.flags = crypto_shash_get_flags(parent) &
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CRYPTO_TFM_REQ_MAY_SLEEP;
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if (keylen > bs) {
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int err;
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err = crypto_shash_digest(&desc.shash, inkey, keylen, ipad);
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if (err)
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return err;
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keylen = ds;
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} else
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memcpy(ipad, inkey, keylen);
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memset(ipad + keylen, 0, bs - keylen);
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memcpy(opad, ipad, bs);
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for (i = 0; i < bs; i++) {
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ipad[i] ^= 0x36;
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opad[i] ^= 0x5c;
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}
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return crypto_shash_init(&desc.shash) ?:
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crypto_shash_update(&desc.shash, ipad, bs) ?:
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crypto_shash_export(&desc.shash, ipad) ?:
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crypto_shash_init(&desc.shash) ?:
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crypto_shash_update(&desc.shash, opad, bs) ?:
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crypto_shash_export(&desc.shash, opad);
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}
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static int hmac_export(struct shash_desc *pdesc, void *out)
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{
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struct shash_desc *desc = shash_desc_ctx(pdesc);
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desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
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return crypto_shash_export(desc, out);
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}
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static int hmac_import(struct shash_desc *pdesc, const void *in)
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{
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struct shash_desc *desc = shash_desc_ctx(pdesc);
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struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm);
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desc->tfm = ctx->hash;
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desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
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return crypto_shash_import(desc, in);
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}
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static int hmac_init(struct shash_desc *pdesc)
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{
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return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm));
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}
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static int hmac_update(struct shash_desc *pdesc,
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const u8 *data, unsigned int nbytes)
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{
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struct shash_desc *desc = shash_desc_ctx(pdesc);
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desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
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return crypto_shash_update(desc, data, nbytes);
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}
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static int hmac_final(struct shash_desc *pdesc, u8 *out)
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{
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struct crypto_shash *parent = pdesc->tfm;
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int ds = crypto_shash_digestsize(parent);
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int ss = crypto_shash_statesize(parent);
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char *opad = crypto_shash_ctx_aligned(parent) + ss;
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struct shash_desc *desc = shash_desc_ctx(pdesc);
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desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
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return crypto_shash_final(desc, out) ?:
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crypto_shash_import(desc, opad) ?:
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crypto_shash_finup(desc, out, ds, out);
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}
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static int hmac_finup(struct shash_desc *pdesc, const u8 *data,
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unsigned int nbytes, u8 *out)
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{
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struct crypto_shash *parent = pdesc->tfm;
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int ds = crypto_shash_digestsize(parent);
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int ss = crypto_shash_statesize(parent);
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char *opad = crypto_shash_ctx_aligned(parent) + ss;
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struct shash_desc *desc = shash_desc_ctx(pdesc);
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desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
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return crypto_shash_finup(desc, data, nbytes, out) ?:
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crypto_shash_import(desc, opad) ?:
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crypto_shash_finup(desc, out, ds, out);
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}
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static int hmac_init_tfm(struct crypto_tfm *tfm)
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{
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struct crypto_shash *parent = __crypto_shash_cast(tfm);
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struct crypto_shash *hash;
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struct crypto_instance *inst = (void *)tfm->__crt_alg;
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struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst);
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struct hmac_ctx *ctx = hmac_ctx(parent);
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hash = crypto_spawn_shash(spawn);
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if (IS_ERR(hash))
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return PTR_ERR(hash);
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parent->descsize = sizeof(struct shash_desc) +
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crypto_shash_descsize(hash);
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ctx->hash = hash;
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return 0;
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}
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static void hmac_exit_tfm(struct crypto_tfm *tfm)
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{
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struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm));
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crypto_free_shash(ctx->hash);
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}
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static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
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{
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struct shash_instance *inst;
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struct crypto_alg *alg;
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struct shash_alg *salg;
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int err;
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int ds;
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int ss;
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err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
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if (err)
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return err;
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salg = shash_attr_alg(tb[1], 0, 0);
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if (IS_ERR(salg))
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return PTR_ERR(salg);
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err = -EINVAL;
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ds = salg->digestsize;
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ss = salg->statesize;
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alg = &salg->base;
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if (ds > alg->cra_blocksize ||
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ss < alg->cra_blocksize)
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goto out_put_alg;
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inst = shash_alloc_instance("hmac", alg);
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err = PTR_ERR(inst);
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if (IS_ERR(inst))
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goto out_put_alg;
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err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg,
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shash_crypto_instance(inst));
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if (err)
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goto out_free_inst;
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inst->alg.base.cra_priority = alg->cra_priority;
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inst->alg.base.cra_blocksize = alg->cra_blocksize;
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inst->alg.base.cra_alignmask = alg->cra_alignmask;
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ss = ALIGN(ss, alg->cra_alignmask + 1);
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inst->alg.digestsize = ds;
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inst->alg.statesize = ss;
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inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) +
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ALIGN(ss * 2, crypto_tfm_ctx_alignment());
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inst->alg.base.cra_init = hmac_init_tfm;
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inst->alg.base.cra_exit = hmac_exit_tfm;
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inst->alg.init = hmac_init;
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inst->alg.update = hmac_update;
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inst->alg.final = hmac_final;
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inst->alg.finup = hmac_finup;
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inst->alg.export = hmac_export;
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inst->alg.import = hmac_import;
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inst->alg.setkey = hmac_setkey;
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err = shash_register_instance(tmpl, inst);
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if (err) {
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out_free_inst:
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shash_free_instance(shash_crypto_instance(inst));
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}
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out_put_alg:
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crypto_mod_put(alg);
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return err;
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}
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static struct crypto_template hmac_tmpl = {
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.name = "hmac",
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.create = hmac_create,
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.free = shash_free_instance,
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.module = THIS_MODULE,
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};
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static int __init hmac_module_init(void)
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{
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return crypto_register_template(&hmac_tmpl);
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}
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static void __exit hmac_module_exit(void)
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{
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crypto_unregister_template(&hmac_tmpl);
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}
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module_init(hmac_module_init);
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module_exit(hmac_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("HMAC hash algorithm");
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