tools/firmware-utils/src/buffalo-lib.c


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119<From 43a93893eb33e996836b99fb3e1f7300c0132a51 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 31 Dec 2019 18:15:33 +0100
Subject: [PATCH 5/7] libata: Assign OF node to the SCSI device

When we spawn a SCSI device from an ATA device in libata-scsi
the SCSI device had no relation to the device tree.

The DT binding allows us to define port nodes under a
PATA (IDE) or SATA host controller, so we can have proper device
nodes for these devices.

If OF is enabled, walk the children of the host controller node
to see if there is a valid device tree node to assign. The reg
is used to match to ID 0 for the master device and ID 1 for the
slave device.

The corresponding device tree bindings have been accepted by
the device tree maintainers.

Cc: Chris Healy <cphealy@gmail.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2:
- Use dev_dbg() for the debug print
- return immediately after finding a matching OF node
---
 drivers/ata/libata-scsi.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -35,6 +35,7 @@
 #include <linux/suspend.h>
 #include <asm/unaligned.h>
 #include <linux/ioprio.h>
+#include <linux/of.h>
 
 #include "libata.h"
 #include "libata-transport.h"
@@ -4573,6 +4574,34 @@ int ata_scsi_add_hosts(struct ata_host *
 	return rc;
 }
 
+#ifdef CONFIG_OF
+static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
+{
+	struct scsi_device *sdev = dev->sdev;
+	struct device *d = ap->host->dev;
+	struct device_node *np = d->of_node;
+	struct device_node *child;
+
+	for_each_available_child_of_node(np, child) {
+		int ret;
+		u32 val;
+
+		ret = of_property_read_u32(child, "reg", &val);
+		if (ret)
+			continue;
+		if (val == dev->devno) {
+			dev_dbg(d, "found matching device node\n");
+			sdev->sdev_gendev.of_node = child;
+			return;
+		}
+	}
+}
+#else
+static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
+{
+}
+#endif
+
 void ata_scsi_scan_host(struct ata_port *ap, int sync)
 {
 	int tries = 5;
@@ -4598,6 +4627,7 @@ void ata_scsi_scan_host(struct ata_port
 						 NULL);
 			if (!IS_ERR(sdev)) {
 				dev->sdev = sdev;
+				ata_scsi_assign_ofnode(dev, ap);
 				scsi_device_put(sdev);
 			} else {
 				dev->sdev = NULL;
/*
 * Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>

#include "buffalo-lib.h"

static uint32_t crc32_table[256] =
{
	0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
	0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
	0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
	0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
	0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
	0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
	0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
	0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
	0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
	0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
	0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
	0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
	0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
	0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
	0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
	0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
	0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
	0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
	0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
	0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
	0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
	0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
	0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
	0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
	0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
	0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
	0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
	0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
	0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
	0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
	0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
	0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
	0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
	0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
	0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
	0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
	0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
	0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
	0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
	0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
	0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
	0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
	0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
	0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
	0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
	0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
	0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
	0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
	0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
	0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
	0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
	0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
	0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
	0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
	0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
	0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
	0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
	0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
	0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
	0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
	0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
	0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
	0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
	0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};

int bcrypt_init(struct bcrypt_ctx *ctx, void *key, int keylen,
		unsigned long state_len)
{
	unsigned char *state;
	unsigned char *p = key;
	unsigned long i, j;
	unsigned long k = 0;

	state = malloc(state_len);
	if (state == NULL)
		return -1;

	ctx->i = 0;
	ctx->j = 0;
	ctx->state = state;
	ctx->state_len = state_len;

	for (i = 0; i < state_len; i++)
		state[i] = i;

	for(i = 0, j = 0; i < state_len; i++, j = (j + 1) % keylen) {
		unsigned char t;

		t = state[i];
		k = (k + p[j] + t) % state_len;
		state[i] = state[k];
		state[k] = t;
	}

	return 0;
}

int bcrypt_process(struct bcrypt_ctx *ctx, unsigned char *src,
		   unsigned char *dst, unsigned long len)
{
	unsigned char *state = ctx->state;
	unsigned long state_len = ctx->state_len;
	unsigned char i, j;
	unsigned long k;

	i = ctx->i;
	j = ctx->j;

	for (k = 0; k < len; k++) {
		unsigned char t;

		i = (i + 1) % state_len;
		j = (j + state[i]) % state_len;
		t = state[j];
		state[j] = state[i];
		state[i] = t;

		dst[k] = src[k] ^ state[(state[i] + state[j]) % state_len];
	}

	ctx->i = i;
	ctx->j = j;

	return len;
}

void bcrypt_finish(struct bcrypt_ctx *ctx)
{
	if (ctx->state)
		free(ctx->state);
}

int bcrypt_buf(unsigned char seed, unsigned char *key, unsigned char *src,
	       unsigned char *dst, unsigned long len, int longstate)
{
	unsigned char bckey[BCRYPT_MAX_KEYLEN + 1];
	unsigned int keylen;
	struct bcrypt_ctx ctx;
	int ret;

	/* setup decryption key */
	keylen = strlen((char *) key);
	bckey[0] = seed;
	memcpy(&bckey[1], key, keylen);

	keylen++;

	ret = bcrypt_init(&ctx, bckey, keylen,
			  (longstate) ? len : BCRYPT_DEFAULT_STATE_LEN);
	if (ret)
		return ret;

	bcrypt_process(&ctx, src, dst, len);
	bcrypt_finish(&ctx);

	return 0;
}

uint32_t buffalo_csum(uint32_t csum, void *buf, unsigned long len)
{
	signed char *p = buf;

	while (len--) {
		int i;

		csum ^= *p++;
		for (i = 0; i < 8; i++)
			csum = (csum >> 1) ^ ((csum & 1) ? 0xedb88320ul : 0);
	}

	return csum;
}

uint32_t buffalo_crc(void *buf, unsigned long len)
{
	unsigned char *p = buf;
	unsigned long t = len;
	uint32_t crc = 0;

	while (len--)
		crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ *p++) & 0xFF];

	while (t) {
		crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ t) & 0xFF];
		t >>= 8;
	}

	return ~crc;
}

unsigned long enc_compute_header_len(char *product, char *version)
{
	return ENC_MAGIC_LEN + 1 + strlen(product) + 1 +
	       strlen(version) + 1 + 3 * sizeof(uint32_t);
}

unsigned long enc_compute_buf_len(char *product, char *version,
				  unsigned long datalen)
{
	unsigned long ret;

	ret = enc_compute_header_len(product, version);
	ret += datalen + sizeof(uint32_t);
	ret += (4 - ret % 4);

	return ret;
}

static void put_be32(void *data, uint32_t val)
{
	unsigned char *p = data;

	p[0] = (val >> 24) & 0xff;
	p[1] = (val >> 16) & 0xff;
	p[2] = (val >> 8) & 0xff;
	p[3] = val & 0xff;
}

static uint32_t get_be32(void *data)
{
	unsigned char *p = data;

	return (((uint32_t)p[0]) << 24) |
	       (((uint32_t)p[1]) << 16) |
	       (((uint32_t)p[2]) << 8) |
	       ((uint32_t)p[3]);
}

static int check_magic(void *magic)
{
	if (!memcmp("start", magic, ENC_MAGIC_LEN))
		return 0;

	if (!memcmp("asar1", magic, ENC_MAGIC_LEN))
		return 0;

	return -1;
}

int encrypt_buf(struct enc_param *ep, unsigned char *hdr,
		unsigned char *data)
{
	unsigned char *p;
	uint32_t len;
	int err;
	int ret = -1;
	unsigned char s;

	p = (unsigned char *) hdr;

	/* setup magic */
	len = strlen((char *) ep->magic) + 1;
	memcpy(p, ep->magic, len);
	p += len;

	/* setup seed */
	*p++ = ep->seed;

	/* put product len */
	len = strlen((char *) ep->product) + 1;
	put_be32(p, len);
	p += sizeof(uint32_t);

	/* copy and crypt product name */
	memcpy(p, ep->product, len);
	err = bcrypt_buf(ep->seed, ep->key, p, p, len, ep->longstate);
	if (err)
		goto out;
	s = *p;
	p += len;

	/* put version length */
	len = strlen((char *) ep->version) + 1;
	put_be32(p, len);
	p += sizeof(uint32_t);

	/* copy and crypt version */
	memcpy(p, ep->version, len);
	err = bcrypt_buf(s, ep->key, p, p, len, ep->longstate);
	if (err)
		goto out;
	s = *p;
	p += len;

	/* put data length */
	put_be32(p, ep->datalen);

	/* encrypt data */
	err = bcrypt_buf(s, ep->key, data, data, ep->datalen, ep->longstate);
	if (err)
		goto out;

	/* put checksum */
	put_be32(&data[ep->datalen], ep->csum);

	ret = 0;

out:
	return ret;
}

int decrypt_buf(struct enc_param *ep, unsigned char *data,
		unsigned long datalen)
{
	unsigned char *p;
	uint32_t prod_len;
	uint32_t ver_len;
	uint32_t len;
	uint32_t csum;
	ssize_t remain;
	int err;
	int ret = -1;

#define CHECKLEN(_l) do {		\
	len = (_l);			\
	if (remain < len) {		\
		goto out;		\
	}				\
} while (0)

#define INCP() do {			\
	p += len;			\
	remain -= len;			\
} while (0)

	remain = datalen;
	p = data;

	CHECKLEN(ENC_MAGIC_LEN);
	err = check_magic(p);
	if (err)
		goto out;
	memcpy(ep->magic, p, ENC_MAGIC_LEN);
	INCP();

	CHECKLEN(1);
	ep->seed = *p;
	INCP();

	CHECKLEN(sizeof(uint32_t));
	prod_len = get_be32(p);
	if (prod_len > ENC_PRODUCT_LEN)
		goto out;
	INCP();

	CHECKLEN(prod_len);
	memcpy(ep->product, p, prod_len);
	INCP();

	CHECKLEN(sizeof(uint32_t));
	ver_len = get_be32(p);
	if (ver_len > ENC_VERSION_LEN)
		goto out;
	INCP();

	CHECKLEN(ver_len);
	memcpy(ep->version, p, ver_len);
	INCP();

	CHECKLEN(sizeof(uint32_t));
	ep->datalen = get_be32(p);
	INCP();

	/* decrypt data */
	CHECKLEN(ep->datalen);
	err = bcrypt_buf(ep->version[0], ep->key, p, data, ep->datalen,
			 ep->longstate);
	if (err)
		goto out;
	INCP();

	CHECKLEN(sizeof(uint32_t));
	ep->csum = get_be32(p);
	INCP();

	csum = buffalo_csum(ep->datalen, data, ep->datalen);
	if (csum != ep->csum)
		goto out;

	/* decrypt product name */
	err = bcrypt_buf(ep->product[0], ep->key, ep->version, ep->version,
			 ver_len, ep->longstate);
	if (err)
		goto out;

	/* decrypt version */
	err = bcrypt_buf(ep->seed, ep->key, ep->product, ep->product, prod_len,
			 ep->longstate);
	if (err)
		goto out;

	ret = 0;
out:
	return ret;

#undef CHECKLEN
#undef INCP
}

ssize_t get_file_size(char *name)
{
	struct stat st;
	int err;

	err = stat(name, &st);
	if (err)
		return -1;

	return st.st_size;
}

int read_file_to_buf(char *name, void *buf, ssize_t buflen)
{
	FILE *f;
	size_t done;
	int ret = -1;

	f = fopen(name, "r");
	if (f == NULL)
		goto out;

	errno = 0;
	done = fread(buf, buflen, 1, f);
	if (done != 1)
		goto close;

	ret = 0;

close:
	fclose(f);
out:
	return ret;
}

int write_buf_to_file(char *name, void *buf, ssize_t buflen)
{
	FILE *f;
	size_t done;
	int ret = -1;

	f = fopen(name, "w");
	if (f == NULL)
		goto out;

	errno = 0;
	done = fwrite(buf, buflen, 1, f);
	if (done != 1)
		goto close;

	ret = 0;

close:
	fflush(f);
	fclose(f);
	if (ret)
		unlink(name);
out:
	return ret;
}