2 * Copyright (c) 2016 Landon Fuller <landonf@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer,
10 * without modification.
11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
13 * redistribution must be conditioned upon including a substantially
14 * similar Disclaimer requirement for further binary redistribution.
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY,
22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
27 * THE POSSIBILITY OF SUCH DAMAGES.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/ctype.h>
36 #include <sys/malloc.h>
37 #include <sys/systm.h>
47 #include "bhnd_nvram_private.h"
49 #include "bhnd_nvram_datavar.h"
51 #include "bhnd_nvram_data_tlvreg.h"
54 * CFE TLV NVRAM data class.
56 * The CFE-defined TLV NVRAM format is used on the WGT634U.
59 struct bhnd_nvram_tlv {
60 struct bhnd_nvram_data nv; /**< common instance state */
61 struct bhnd_nvram_io *data; /**< backing buffer */
62 size_t count; /**< variable count */
65 BHND_NVRAM_DATA_CLASS_DEFN(tlv, "WGT634U", BHND_NVRAM_DATA_CAP_DEVPATHS,
66 sizeof(struct bhnd_nvram_tlv))
68 /** Minimal TLV_ENV record header */
69 struct bhnd_nvram_tlv_env_hdr {
74 /** Minimal TLV_ENV record */
75 struct bhnd_nvram_tlv_env {
76 struct bhnd_nvram_tlv_env_hdr hdr;
81 /* Return the length in bytes of an TLV_ENV's envp data */
82 #define NVRAM_TLV_ENVP_DATA_LEN(_env) \
83 (((_env)->hdr.size < sizeof((_env)->flags)) ? 0 : \
84 ((_env)->hdr.size - sizeof((_env)->flags)))
86 /* Maximum supported length of the envp data field, in bytes */
87 #define NVRAM_TLV_ENVP_DATA_MAX_LEN \
88 (UINT8_MAX - sizeof(uint8_t) /* flags */)
91 static int bhnd_nvram_tlv_parse_size(
92 struct bhnd_nvram_io *io,
95 static int bhnd_nvram_tlv_next_record(
96 struct bhnd_nvram_io *io,
97 size_t *next, size_t *offset,
100 static struct bhnd_nvram_tlv_env *bhnd_nvram_tlv_next_env(
101 struct bhnd_nvram_tlv *tlv,
102 size_t *next, void **cookiep);
104 static struct bhnd_nvram_tlv_env *bhnd_nvram_tlv_get_env(
105 struct bhnd_nvram_tlv *tlv,
108 static void *bhnd_nvram_tlv_to_cookie(
109 struct bhnd_nvram_tlv *tlv,
111 static size_t bhnd_nvram_tlv_to_offset(
112 struct bhnd_nvram_tlv *tlv,
116 bhnd_nvram_tlv_probe(struct bhnd_nvram_io *io)
118 struct bhnd_nvram_tlv_env ident;
122 nbytes = bhnd_nvram_io_getsize(io);
124 /* Handle what might be an empty TLV image */
125 if (nbytes < sizeof(ident)) {
128 /* Fetch just the first tag */
129 error = bhnd_nvram_io_read(io, 0x0, &tag, sizeof(tag));
133 /* This *could* be an empty TLV image, but all we're
134 * testing for here is a single 0x0 byte followed by EOF */
135 if (tag == NVRAM_TLV_TYPE_END)
136 return (BHND_NVRAM_DATA_PROBE_MAYBE);
141 /* Otherwise, look at the initial header for a valid TLV ENV tag,
142 * plus one byte of the entry data */
143 error = bhnd_nvram_io_read(io, 0x0, &ident,
144 sizeof(ident) + sizeof(ident.envp[0]));
148 /* First entry should be a variable record (which we statically
149 * assert as being defined to use a single byte size field) */
150 if (ident.hdr.tag != NVRAM_TLV_TYPE_ENV)
153 _Static_assert(NVRAM_TLV_TYPE_ENV & NVRAM_TLV_TF_U8_LEN,
154 "TYPE_ENV is not a U8-sized field");
156 /* The entry must be at least 3 characters ('x=\0') in length */
157 if (ident.hdr.size < 3)
160 /* The first character should be a valid key char (alpha) */
161 if (!bhnd_nv_isalpha(ident.envp[0]))
164 return (BHND_NVRAM_DATA_PROBE_DEFAULT);
168 bhnd_nvram_tlv_serialize(bhnd_nvram_data_class *cls, bhnd_nvram_plist *props,
169 bhnd_nvram_plist *options, void *outp, size_t *olen)
171 bhnd_nvram_prop *prop;
172 size_t limit, nbytes;
175 /* Determine output byte limit */
183 /* Write all properties */
185 while ((prop = bhnd_nvram_plist_next(props, prop)) != NULL) {
186 struct bhnd_nvram_tlv_env env;
189 size_t name_len, value_len;
192 env.hdr.tag = NVRAM_TLV_TYPE_ENV;
193 env.hdr.size = sizeof(env.flags);
196 /* Fetch name value and add to record length */
197 name = bhnd_nvram_prop_name(prop);
198 name_len = strlen(name) + 1 /* '=' */;
200 if (UINT8_MAX - env.hdr.size < name_len) {
201 BHND_NV_LOG("%s name exceeds maximum TLV record "
203 return (EFTYPE); /* would overflow TLV size */
206 env.hdr.size += name_len;
208 /* Add string value to record length */
209 error = bhnd_nvram_prop_encode(prop, NULL, &value_len,
210 BHND_NVRAM_TYPE_STRING);
212 BHND_NV_LOG("error serializing %s to required type "
214 bhnd_nvram_type_name(BHND_NVRAM_TYPE_STRING),
219 if (UINT8_MAX - env.hdr.size < value_len) {
220 BHND_NV_LOG("%s value exceeds maximum TLV record "
222 return (EFTYPE); /* would overflow TLV size */
225 env.hdr.size += value_len;
227 /* Calculate total record size */
228 rec_size = sizeof(env.hdr) + env.hdr.size;
229 if (SIZE_MAX - nbytes < rec_size)
230 return (EFTYPE); /* would overflow size_t */
232 /* Calculate our output pointer */
233 if (nbytes > limit || limit - nbytes < rec_size) {
234 /* buffer is full; cannot write */
237 p = (uint8_t *)outp + nbytes;
240 /* Write to output */
242 memcpy(p, &env, sizeof(env));
245 memcpy(p, name, name_len - 1);
246 p[name_len - 1] = '=';
249 error = bhnd_nvram_prop_encode(prop, p, &value_len,
250 BHND_NVRAM_TYPE_STRING);
252 BHND_NV_LOG("error serializing %s to required "
253 "type %s: %d\n", name,
254 bhnd_nvram_type_name(
255 BHND_NVRAM_TYPE_STRING),
264 /* Write terminating END record */
266 *((uint8_t *)outp + nbytes) = NVRAM_TLV_TYPE_END;
268 if (nbytes == SIZE_MAX)
269 return (EFTYPE); /* would overflow size_t */
272 /* Provide required length */
285 * Initialize @p tlv with the provided NVRAM TLV data mapped by @p src.
287 * @param tlv A newly allocated data instance.
290 bhnd_nvram_tlv_init(struct bhnd_nvram_tlv *tlv, struct bhnd_nvram_io *src)
292 struct bhnd_nvram_tlv_env *env;
297 BHND_NV_ASSERT(tlv->data == NULL, ("tlv data already initialized"));
299 /* Determine the actual size of the TLV source data */
300 if ((error = bhnd_nvram_tlv_parse_size(src, &size)))
303 /* Copy to our own internal buffer */
304 if ((tlv->data = bhnd_nvram_iobuf_copy_range(src, 0x0, size)) == NULL)
307 /* Initialize our backing buffer */
310 while ((env = bhnd_nvram_tlv_next_env(tlv, &next, NULL)) != NULL) {
314 /* TLV_ENV data must not be empty */
315 env_len = NVRAM_TLV_ENVP_DATA_LEN(env);
317 BHND_NV_LOG("cannot parse zero-length TLV_ENV record "
322 /* Parse the key=value string, and then replace the '='
323 * delimiter with '\0' to allow us to provide direct
324 * name pointers from our backing buffer */
325 error = bhnd_nvram_parse_env(env->envp, env_len, '=', NULL,
326 &name_len, NULL, NULL);
328 BHND_NV_LOG("error parsing TLV_ENV data: %d\n", error);
332 /* Replace '=' with '\0' */
333 *(env->envp + name_len) = '\0';
335 /* Add to variable count */
343 bhnd_nvram_tlv_new(struct bhnd_nvram_data *nv, struct bhnd_nvram_io *io)
346 struct bhnd_nvram_tlv *tlv;
349 /* Allocate and initialize the TLV data instance */
350 tlv = (struct bhnd_nvram_tlv *)nv;
352 /* Parse the TLV input data and initialize our backing
353 * data representation */
354 if ((error = bhnd_nvram_tlv_init(tlv, io))) {
355 bhnd_nvram_tlv_free(nv);
363 bhnd_nvram_tlv_free(struct bhnd_nvram_data *nv)
365 struct bhnd_nvram_tlv *tlv = (struct bhnd_nvram_tlv *)nv;
366 if (tlv->data != NULL)
367 bhnd_nvram_io_free(tlv->data);
371 bhnd_nvram_tlv_count(struct bhnd_nvram_data *nv)
373 struct bhnd_nvram_tlv *tlv = (struct bhnd_nvram_tlv *)nv;
378 static bhnd_nvram_plist *
379 bhnd_nvram_tlv_options(struct bhnd_nvram_data *nv)
385 bhnd_nvram_tlv_caps(struct bhnd_nvram_data *nv)
387 return (BHND_NVRAM_DATA_CAP_READ_PTR|BHND_NVRAM_DATA_CAP_DEVPATHS);
391 bhnd_nvram_tlv_next(struct bhnd_nvram_data *nv, void **cookiep)
393 struct bhnd_nvram_tlv *tlv;
394 struct bhnd_nvram_tlv_env *env;
397 tlv = (struct bhnd_nvram_tlv *)nv;
399 /* Find next readable TLV record */
400 if (*cookiep == NULL) {
401 /* Start search at offset 0x0 */
403 env = bhnd_nvram_tlv_next_env(tlv, &io_offset, cookiep);
405 /* Seek past the previous env record */
406 io_offset = bhnd_nvram_tlv_to_offset(tlv, *cookiep);
407 env = bhnd_nvram_tlv_next_env(tlv, &io_offset, NULL);
409 BHND_NV_PANIC("invalid cookiep; record missing");
411 /* Advance to next env record, update the caller's cookiep */
412 env = bhnd_nvram_tlv_next_env(tlv, &io_offset, cookiep);
419 /* Return the NUL terminated name */
424 bhnd_nvram_tlv_find(struct bhnd_nvram_data *nv, const char *name)
426 return (bhnd_nvram_data_generic_find(nv, name));
430 bhnd_nvram_tlv_getvar_order(struct bhnd_nvram_data *nv, void *cookiep1,
433 if (cookiep1 < cookiep2)
436 if (cookiep1 > cookiep2)
443 bhnd_nvram_tlv_getvar(struct bhnd_nvram_data *nv, void *cookiep, void *buf,
444 size_t *len, bhnd_nvram_type type)
446 return (bhnd_nvram_data_generic_rp_getvar(nv, cookiep, buf, len, type));
450 bhnd_nvram_tlv_copy_val(struct bhnd_nvram_data *nv, void *cookiep,
451 bhnd_nvram_val **value)
453 return (bhnd_nvram_data_generic_rp_copy_val(nv, cookiep, value));
457 bhnd_nvram_tlv_getvar_ptr(struct bhnd_nvram_data *nv, void *cookiep,
458 size_t *len, bhnd_nvram_type *type)
460 struct bhnd_nvram_tlv *tlv;
461 struct bhnd_nvram_tlv_env *env;
465 tlv = (struct bhnd_nvram_tlv *)nv;
467 /* Fetch pointer to the TLV_ENV record */
468 if ((env = bhnd_nvram_tlv_get_env(tlv, cookiep)) == NULL)
469 BHND_NV_PANIC("invalid cookiep: %p", cookiep);
471 /* Parse value pointer and length from key\0value data */
472 error = bhnd_nvram_parse_env(env->envp, NVRAM_TLV_ENVP_DATA_LEN(env),
473 '\0', NULL, NULL, &val, len);
475 BHND_NV_PANIC("unexpected error parsing '%s'", env->envp);
477 /* Type is always CSTR */
478 *type = BHND_NVRAM_TYPE_STRING;
484 bhnd_nvram_tlv_getvar_name(struct bhnd_nvram_data *nv, void *cookiep)
486 struct bhnd_nvram_tlv *tlv;
487 const struct bhnd_nvram_tlv_env *env;
489 tlv = (struct bhnd_nvram_tlv *)nv;
491 /* Fetch pointer to the TLV_ENV record */
492 if ((env = bhnd_nvram_tlv_get_env(tlv, cookiep)) == NULL)
493 BHND_NV_PANIC("invalid cookiep: %p", cookiep);
495 /* Return name pointer */
496 return (&env->envp[0]);
500 bhnd_nvram_tlv_filter_setvar(struct bhnd_nvram_data *nv, const char *name,
501 bhnd_nvram_val *value, bhnd_nvram_val **result)
505 bhnd_nvram_type itype;
507 size_t name_len, tlv_nremain;
510 tlv_nremain = NVRAM_TLV_ENVP_DATA_MAX_LEN;
512 /* Name (trimmed of any path prefix) must be valid */
513 if (!bhnd_nvram_validate_name(bhnd_nvram_trim_path_name(name)))
516 /* 'name=' must fit within the maximum TLV_ENV record length */
517 name_len = strlen(name) + 1; /* '=' */
518 if (tlv_nremain < name_len) {
519 BHND_NV_LOG("'%s=' exceeds maximum TLV_ENV record length\n",
523 tlv_nremain -= name_len;
525 /* Convert value to a (bcm-formatted) string */
526 error = bhnd_nvram_val_convert_new(&str, &bhnd_nvram_val_bcm_string_fmt,
527 value, BHND_NVRAM_VAL_DYNAMIC);
531 /* The string value must fit within remaining TLV_ENV record length */
532 inp = bhnd_nvram_val_bytes(str, &ilen, &itype);
533 if (tlv_nremain < ilen) {
534 BHND_NV_LOG("'%.*s\\0' exceeds maximum TLV_ENV record length\n",
535 BHND_NV_PRINT_WIDTH(ilen), inp);
537 bhnd_nvram_val_release(str);
540 tlv_nremain -= name_len;
542 /* Success. Transfer result ownership to the caller. */
548 bhnd_nvram_tlv_filter_unsetvar(struct bhnd_nvram_data *nv, const char *name)
550 /* We permit deletion of any variable */
555 * Iterate over the records starting at @p next, returning the parsed
556 * record's @p tag, @p size, and @p offset.
558 * @param io The I/O context to parse.
559 * @param[in,out] next The next offset to be parsed, or 0x0
560 * to begin parsing. Upon successful
561 * return, will be set to the offset of the
562 * next record (or EOF, if
563 * NVRAM_TLV_TYPE_END was parsed).
564 * @param[out] offset The record's value offset.
565 * @param[out] tag The record's tag.
568 * @retval EINVAL if parsing @p io as TLV fails.
569 * @retval non-zero if reading @p io otherwise fails, a regular unix error
570 * code will be returned.
573 bhnd_nvram_tlv_next_record(struct bhnd_nvram_io *io, size_t *next, size_t
574 *offset, uint8_t *tag)
576 size_t io_offset, io_size;
582 io_size = bhnd_nvram_io_getsize(io);
584 /* Save the record offset */
588 /* Fetch initial tag */
589 error = bhnd_nvram_io_read(io, io_offset, tag, sizeof(*tag));
595 if (*tag == NVRAM_TLV_TYPE_END) {
600 /* Read length field */
601 if (*tag & NVRAM_TLV_TF_U8_LEN) {
602 error = bhnd_nvram_io_read(io, io_offset, &len_hdr,
605 BHND_NV_LOG("error reading TLV record size: %d\n",
610 parsed_len = len_hdr[0];
613 error = bhnd_nvram_io_read(io, io_offset, &len_hdr,
616 BHND_NV_LOG("error reading 16-bit TLV record "
617 "size: %d\n", error);
621 parsed_len = (len_hdr[0] << 8) | len_hdr[1];
625 /* Advance to next record */
626 if (parsed_len > io_size || io_size - parsed_len < io_offset) {
628 BHND_NV_LOG("TLV record length %hu truncated by input "
629 "size of %zu\n", parsed_len, io_size);
633 *next = io_offset + parsed_len;
635 /* Valid record found */
640 * Parse the TLV data in @p io to determine the total size of the TLV
641 * data mapped by @p io (which may be less than the size of @p io).
644 bhnd_nvram_tlv_parse_size(struct bhnd_nvram_io *io, size_t *size)
650 /* We have to perform a minimal parse to determine the actual length */
654 /* Iterate over the input until we hit END tag or the read fails */
656 error = bhnd_nvram_tlv_next_record(io, &next, NULL, &tag);
659 } while (tag != NVRAM_TLV_TYPE_END);
661 /* Offset should now point to EOF */
662 BHND_NV_ASSERT(next <= bhnd_nvram_io_getsize(io),
663 ("parse returned invalid EOF offset"));
670 * Iterate over the records in @p tlv, returning a pointer to the next
671 * NVRAM_TLV_TYPE_ENV record, or NULL if EOF is reached.
673 * @param tlv The TLV instance.
674 * @param[in,out] next The next offset to be parsed, or 0x0
675 * to begin parsing. Upon successful
676 * return, will be set to the offset of the
679 static struct bhnd_nvram_tlv_env *
680 bhnd_nvram_tlv_next_env(struct bhnd_nvram_tlv *tlv, size_t *next,
686 /* Find the next TLV_ENV record, starting at @p next */
691 /* Fetch the next TLV record */
692 error = bhnd_nvram_tlv_next_record(tlv->data, next, &offset,
695 BHND_NV_LOG("unexpected error in next_record(): %d\n",
700 /* Only interested in ENV records */
701 if (tag != NVRAM_TLV_TYPE_ENV)
704 /* Map and return TLV_ENV record pointer */
705 c = bhnd_nvram_tlv_to_cookie(tlv, offset);
707 /* Provide the cookiep value for the returned record */
711 return (bhnd_nvram_tlv_get_env(tlv, c));
712 } while (tag != NVRAM_TLV_TYPE_END);
714 /* No remaining ENV records */
719 * Return a pointer to the TLV_ENV record for @p cookiep, or NULL
722 static struct bhnd_nvram_tlv_env *
723 bhnd_nvram_tlv_get_env(struct bhnd_nvram_tlv *tlv, void *cookiep)
725 struct bhnd_nvram_tlv_env *env;
728 size_t io_offset, io_size;
731 io_size = bhnd_nvram_io_getsize(tlv->data);
732 io_offset = bhnd_nvram_tlv_to_offset(tlv, cookiep);
735 if (io_offset == io_size)
738 /* Fetch non-const pointer to the record entry */
739 error = bhnd_nvram_io_write_ptr(tlv->data, io_offset, &ptr,
740 sizeof(env->hdr), &navail);
742 /* Should never occur with a valid cookiep */
743 BHND_NV_LOG("error mapping record for cookiep: %d\n", error);
747 /* Validate the record pointer */
749 if (env->hdr.tag != NVRAM_TLV_TYPE_ENV) {
750 /* Should never occur with a valid cookiep */
751 BHND_NV_LOG("non-ENV record mapped for %p\n", cookiep);
755 /* Is the required variable name data is mapped? */
756 if (navail < sizeof(struct bhnd_nvram_tlv_env_hdr) + env->hdr.size ||
757 env->hdr.size == sizeof(env->flags))
759 /* Should never occur with a valid cookiep */
760 BHND_NV_LOG("TLV_ENV variable data not mapped for %p\n",
769 * Return a cookiep for the given I/O offset.
772 bhnd_nvram_tlv_to_cookie(struct bhnd_nvram_tlv *tlv, size_t io_offset)
777 BHND_NV_ASSERT(io_offset < bhnd_nvram_io_getsize(tlv->data),
778 ("io_offset %zu out-of-range", io_offset));
779 BHND_NV_ASSERT(io_offset < UINTPTR_MAX,
780 ("io_offset %#zx exceeds UINTPTR_MAX", io_offset));
782 error = bhnd_nvram_io_read_ptr(tlv->data, 0x0, &ptr, io_offset, NULL);
784 BHND_NV_PANIC("error mapping offset %zu: %d", io_offset, error);
786 ptr = (const uint8_t *)ptr + io_offset;
787 return (__DECONST(void *, ptr));
790 /* Convert a cookiep back to an I/O offset */
792 bhnd_nvram_tlv_to_offset(struct bhnd_nvram_tlv *tlv, void *cookiep)
799 BHND_NV_ASSERT(cookiep != NULL, ("null cookiep"));
801 io_size = bhnd_nvram_io_getsize(tlv->data);
803 error = bhnd_nvram_io_read_ptr(tlv->data, 0x0, &ptr, io_size, NULL);
805 BHND_NV_PANIC("error mapping offset %zu: %d", io_size, error);
807 offset = (const uint8_t *)cookiep - (const uint8_t *)ptr;
808 BHND_NV_ASSERT(offset >= 0, ("invalid cookiep"));
809 BHND_NV_ASSERT((uintptr_t)offset < SIZE_MAX, ("cookiep > SIZE_MAX)"));
810 BHND_NV_ASSERT((uintptr_t)offset <= io_size, ("cookiep > io_size)"));
812 return ((size_t)offset);