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freebsd-skq/stand/common/module.c
sjg 7993a62d04 veloader use vectx API for kernel and modules 
The vectx API, computes the hash for verifying a file as it is read.
This avoids the overhead of reading files twice - once to verify, then
again to load.

For doing an install via loader, avoiding the need to rewind
large files is critical.

This API is only used for modules, kernel and mdimage as these are the
biggest files read by the loader.
The reduction in boot time depends on how expensive the I/O is
on any given platform.  On a fast VM we see 6% improvement.

For install via loader the first file to be verified is likely to be the
kernel, so some of the prep work (finding manifest etc) done by
verify_file() needs to be factored so it can be reused for
vectx_open().

For missing or unrecognized fingerprint entries, we fail
in vectx_open() unless verifying is disabled.

Otherwise fingerprint check happens in vectx_close() and
since this API is only used for files which must be verified
(VE_MUST) we panic if we get an incorrect hash.

Reviewed by:	imp,tsoome
MFC after:	1 week
Sponsored by:	Juniper Networks
Differential Revision:	https://reviews.freebsd.org//D23827
2020-03-08 17:42:42 +00:00

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/*-
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* file/module function dispatcher, support, etc.
*/
#include <stand.h>
#include <string.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/queue.h>
#include <sys/stdint.h>
#if defined(LOADER_FDT_SUPPORT)
#include <fdt_platform.h>
#endif
#include "bootstrap.h"
#define MDIR_REMOVED 0x0001
#define MDIR_NOHINTS 0x0002
struct moduledir {
char *d_path; /* path of modules directory */
u_char *d_hints; /* content of linker.hints file */
int d_hintsz; /* size of hints data */
int d_flags;
STAILQ_ENTRY(moduledir) d_link;
};
static int file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
static int file_load_dependencies(struct preloaded_file *base_mod);
static char * file_search(const char *name, char **extlist);
static struct kernel_module * file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
static int file_havepath(const char *name);
static char *mod_searchmodule(char *name, struct mod_depend *verinfo);
static char * mod_searchmodule_pnpinfo(const char *bus, const char *pnpinfo);
static void file_insert_tail(struct preloaded_file *mp);
static void file_remove(struct preloaded_file *fp);
struct file_metadata* metadata_next(struct file_metadata *base_mp, int type);
static void moduledir_readhints(struct moduledir *mdp);
static void moduledir_rebuild(void);
/* load address should be tweaked by first module loaded (kernel) */
static vm_offset_t loadaddr = 0;
#if defined(LOADER_FDT_SUPPORT)
static const char *default_searchpath =
"/boot/kernel;/boot/modules;/boot/dtb";
#else
static const char *default_searchpath = "/boot/kernel;/boot/modules";
#endif
static STAILQ_HEAD(, moduledir) moduledir_list =
STAILQ_HEAD_INITIALIZER(moduledir_list);
struct preloaded_file *preloaded_files = NULL;
static char *kld_ext_list[] = {
".ko",
"",
".debug",
NULL
};
/*
* load an object, either a disk file or code module.
*
* To load a file, the syntax is:
*
* load -t <type> <path>
*
* code modules are loaded as:
*
* load <path> <options>
*/
COMMAND_SET(load, "load", "load a kernel or module", command_load);
static int
command_load(int argc, char *argv[])
{
struct preloaded_file *fp;
char *typestr;
char *prefix;
char *skip;
int dflag, dofile, dokld, ch, error;
dflag = dokld = dofile = 0;
optind = 1;
optreset = 1;
typestr = NULL;
if (argc == 1) {
command_errmsg = "no filename specified";
return (CMD_CRIT);
}
prefix = skip = NULL;
while ((ch = getopt(argc, argv, "dkp:s:t:")) != -1) {
switch(ch) {
case 'd':
dflag++;
break;
case 'k':
dokld = 1;
break;
case 'p':
prefix = optarg;
break;
case 's':
skip = optarg;
break;
case 't':
typestr = optarg;
dofile = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return (CMD_OK);
}
}
argv += (optind - 1);
argc -= (optind - 1);
/*
* Request to load a raw file?
*/
if (dofile) {
if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
command_errmsg = "invalid load type";
return (CMD_CRIT);
}
#ifdef LOADER_VERIEXEC
if (strncmp(typestr, "manifest", 8) == 0) {
if (dflag > 0)
ve_debug_set(dflag);
return (load_manifest(argv[1], prefix, skip, NULL));
}
#ifdef LOADER_VERIEXEC_PASS_MANIFEST
if (strncmp(typestr, "pass_manifest", 13) == 0) {
if (dflag > 0)
ve_debug_set(dflag);
return (pass_manifest(argv[1], prefix));
}
#endif
#endif
fp = file_findfile(argv[1], typestr);
if (fp) {
snprintf(command_errbuf, sizeof(command_errbuf),
"warning: file '%s' already loaded", argv[1]);
return (CMD_WARN);
}
if (file_loadraw(argv[1], typestr, 1) != NULL)
return (CMD_OK);
/* Failing to load mfs_root is never going to end well! */
if (strcmp("mfs_root", typestr) == 0)
return (CMD_FATAL);
return (CMD_ERROR);
}
/*
* Do we have explicit KLD load ?
*/
if (dokld || file_havepath(argv[1])) {
error = mod_loadkld(argv[1], argc - 2, argv + 2);
if (error == EEXIST) {
snprintf(command_errbuf, sizeof(command_errbuf),
"warning: KLD '%s' already loaded", argv[1]);
return (CMD_WARN);
}
return (error == 0 ? CMD_OK : CMD_CRIT);
}
/*
* Looks like a request for a module.
*/
error = mod_load(argv[1], NULL, argc - 2, argv + 2);
if (error == EEXIST) {
snprintf(command_errbuf, sizeof(command_errbuf),
"warning: module '%s' already loaded", argv[1]);
return (CMD_WARN);
}
return (error == 0 ? CMD_OK : CMD_CRIT);
}
#ifdef LOADER_GELI_SUPPORT
COMMAND_SET(load_geli, "load_geli", "load a geli key", command_load_geli);
static int
command_load_geli(int argc, char *argv[])
{
char typestr[80];
char *cp;
int ch, num;
if (argc < 3) {
command_errmsg = "usage is [-n key#] <prov> <file>";
return(CMD_ERROR);
}
num = 0;
optind = 1;
optreset = 1;
while ((ch = getopt(argc, argv, "n:")) != -1) {
switch(ch) {
case 'n':
num = strtol(optarg, &cp, 0);
if (cp == optarg) {
snprintf(command_errbuf, sizeof(command_errbuf),
"bad key index '%s'", optarg);
return(CMD_ERROR);
}
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind - 1);
argc -= (optind - 1);
sprintf(typestr, "%s:geli_keyfile%d", argv[1], num);
return (file_loadraw(argv[2], typestr, 1) ? CMD_OK : CMD_ERROR);
}
#endif
void
unload(void)
{
struct preloaded_file *fp;
while (preloaded_files != NULL) {
fp = preloaded_files;
preloaded_files = preloaded_files->f_next;
file_discard(fp);
}
loadaddr = 0;
unsetenv("kernelname");
}
COMMAND_SET(unload, "unload", "unload all modules", command_unload);
static int
command_unload(int argc, char *argv[])
{
unload();
return(CMD_OK);
}
COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
static int
command_lsmod(int argc, char *argv[])
{
struct preloaded_file *fp;
struct kernel_module *mp;
struct file_metadata *md;
char lbuf[80];
int ch, verbose, ret = 0;
verbose = 0;
optind = 1;
optreset = 1;
while ((ch = getopt(argc, argv, "v")) != -1) {
switch(ch) {
case 'v':
verbose = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
pager_open();
for (fp = preloaded_files; fp; fp = fp->f_next) {
snprintf(lbuf, sizeof(lbuf), " %p: ", (void *) fp->f_addr);
pager_output(lbuf);
pager_output(fp->f_name);
snprintf(lbuf, sizeof(lbuf), " (%s, 0x%lx)\n", fp->f_type,
(long)fp->f_size);
if (pager_output(lbuf))
break;
if (fp->f_args != NULL) {
pager_output(" args: ");
pager_output(fp->f_args);
if (pager_output("\n"))
break;
}
if (fp->f_modules) {
pager_output(" modules: ");
for (mp = fp->f_modules; mp; mp = mp->m_next) {
snprintf(lbuf, sizeof(lbuf), "%s.%d ", mp->m_name,
mp->m_version);
pager_output(lbuf);
}
if (pager_output("\n"))
break;
}
if (verbose) {
/* XXX could add some formatting smarts here to display some better */
for (md = fp->f_metadata; md != NULL; md = md->md_next) {
snprintf(lbuf, sizeof(lbuf), " 0x%04x, 0x%lx\n",
md->md_type, (long) md->md_size);
if (pager_output(lbuf))
break;
}
}
if (ret)
break;
}
pager_close();
return(CMD_OK);
}
COMMAND_SET(pnpmatch, "pnpmatch", "list matched modules based on pnpinfo", command_pnpmatch);
static int pnp_dump_flag = 0;
static int pnp_unbound_flag = 0;
static int pnp_verbose_flag = 0;
static int
command_pnpmatch(int argc, char *argv[])
{
char *module;
int ch;
pnp_verbose_flag = 0;
pnp_dump_flag = 0;
optind = 1;
optreset = 1;
while ((ch = getopt(argc, argv, "vd")) != -1) {
switch(ch) {
case 'v':
pnp_verbose_flag = 1;
break;
case 'd':
pnp_dump_flag = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind - 1);
argc -= (optind - 1);
module = mod_searchmodule_pnpinfo(argv[1], argv[2]);
if (module)
printf("Matched module: %s\n", module);
else if(argv[1])
printf("No module matches %s\n", argv[1]);
return (CMD_OK);
}
COMMAND_SET(pnpload, "pnpload", "load matched modules based on pnpinfo", command_pnpload);
static int
command_pnpload(int argc, char *argv[])
{
char *module;
int ch, error;
pnp_verbose_flag = 0;
pnp_dump_flag = 0;
optind = 1;
optreset = 1;
while ((ch = getopt(argc, argv, "vd")) != -1) {
switch(ch) {
case 'v':
pnp_verbose_flag = 1;
break;
case 'd':
pnp_dump_flag = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind - 1);
argc -= (optind - 1);
if (argc != 2)
return (CMD_ERROR);
module = mod_searchmodule_pnpinfo(argv[1], argv[2]);
error = mod_load(module, NULL, 0, NULL);
if (error == EEXIST) {
snprintf(command_errbuf, sizeof(command_errbuf),
"warning: module '%s' already loaded", argv[1]);
return (CMD_WARN);
}
return (error == 0 ? CMD_OK : CMD_CRIT);
}
#if defined(LOADER_FDT_SUPPORT)
static void
pnpautoload_simplebus(void) {
const char *pnpstring;
const char *compatstr;
char *pnpinfo = NULL;
char *module = NULL;
int tag = 0, len, pnplen;
int error;
while (1) {
pnpstring = fdt_devmatch_next(&tag, &len);
if (pnpstring == NULL)
return;
compatstr = pnpstring;
for (pnplen = 0; pnplen != len; compatstr = pnpstring + pnplen) {
pnplen += strlen(compatstr) + 1;
asprintf(&pnpinfo, "compat=%s", compatstr);
module = mod_searchmodule_pnpinfo("simplebus", pnpinfo);
if (module) {
error = mod_loadkld(module, 0, NULL);
if (error)
printf("Cannot load module %s\n", module);
break;
}
}
free(pnpinfo);
free(module);
}
}
#endif
struct pnp_bus {
const char *name;
void (*load)(void);
};
struct pnp_bus pnp_buses[] = {
#if defined(LOADER_FDT_SUPPORT)
{"simplebus", pnpautoload_simplebus},
#endif
};
COMMAND_SET(pnpautoload, "pnpautoload", "auto load modules based on pnpinfo", command_pnpautoload);
static int
command_pnpautoload(int argc, char *argv[])
{
int i;
int verbose;
int ch, match;
pnp_verbose_flag = 0;
pnp_dump_flag = 0;
verbose = 0;
optind = 1;
optreset = 1;
match = 0;
while ((ch = getopt(argc, argv, "v")) != -1) {
switch(ch) {
case 'v':
verbose = 1;
break;
case '?':
default:
/* getopt has already reported an error */
return(CMD_OK);
}
}
argv += (optind - 1);
argc -= (optind - 1);
if (argc > 2)
return (CMD_ERROR);
for (i = 0; i < nitems(pnp_buses); i++) {
if (argc == 2 && strcmp(argv[1], pnp_buses[i].name) != 0) {
if (verbose)
printf("Skipping bus %s\n", pnp_buses[i].name);
continue;
}
if (verbose)
printf("Autoloading modules for simplebus\n");
pnp_buses[i].load();
match = 1;
}
if (match == 0)
printf("Unsupported bus %s\n", argv[1]);
return (CMD_OK);
}
/*
* File level interface, functions file_*
*/
int
file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
{
static int last_file_format = 0;
struct preloaded_file *fp;
int error;
int i;
if (archsw.arch_loadaddr != NULL)
dest = archsw.arch_loadaddr(LOAD_RAW, filename, dest);
error = EFTYPE;
for (i = last_file_format, fp = NULL;
file_formats[i] && fp == NULL; i++) {
error = (file_formats[i]->l_load)(filename, dest, &fp);
if (error == 0) {
fp->f_loader = last_file_format = i; /* remember the loader */
*result = fp;
break;
} else if (last_file_format == i && i != 0) {
/* Restart from the beginning */
i = -1;
last_file_format = 0;
fp = NULL;
continue;
}
if (error == EFTYPE)
continue; /* Unknown to this handler? */
if (error) {
snprintf(command_errbuf, sizeof(command_errbuf),
"can't load file '%s': %s", filename, strerror(error));
break;
}
}
return (error);
}
static int
file_load_dependencies(struct preloaded_file *base_file)
{
struct file_metadata *md;
struct preloaded_file *fp;
struct mod_depend *verinfo;
struct kernel_module *mp;
char *dmodname;
int error;
md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
if (md == NULL)
return (0);
error = 0;
do {
verinfo = (struct mod_depend*)md->md_data;
dmodname = (char *)(verinfo + 1);
if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
printf("loading required module '%s'\n", dmodname);
error = mod_load(dmodname, verinfo, 0, NULL);
if (error)
break;
/*
* If module loaded via kld name which isn't listed
* in the linker.hints file, we should check if it have
* required version.
*/
mp = file_findmodule(NULL, dmodname, verinfo);
if (mp == NULL) {
snprintf(command_errbuf, sizeof(command_errbuf),
"module '%s' exists but with wrong version", dmodname);
error = ENOENT;
break;
}
}
md = metadata_next(md, MODINFOMD_DEPLIST);
} while (md);
if (!error)
return (0);
/* Load failed; discard everything */
while (base_file != NULL) {
fp = base_file;
base_file = base_file->f_next;
file_discard(fp);
}
return (error);
}
#ifdef LOADER_VERIEXEC_VECTX
#define VECTX_HANDLE(fd) vctx
#else
#define VECTX_HANDLE(fd) fd
#endif
/*
* We've been asked to load (fname) as (type), so just suck it in,
* no arguments or anything.
*/
struct preloaded_file *
file_loadraw(const char *fname, char *type, int insert)
{
struct preloaded_file *fp;
char *name;
int fd, got;
vm_offset_t laddr;
#ifdef LOADER_VERIEXEC_VECTX
struct vectx *vctx;
int verror;
#endif
/* We can't load first */
if ((file_findfile(NULL, NULL)) == NULL) {
command_errmsg = "can't load file before kernel";
return(NULL);
}
/* locate the file on the load path */
name = file_search(fname, NULL);
if (name == NULL) {
snprintf(command_errbuf, sizeof(command_errbuf),
"can't find '%s'", fname);
return(NULL);
}
if ((fd = open(name, O_RDONLY)) < 0) {
snprintf(command_errbuf, sizeof(command_errbuf),
"can't open '%s': %s", name, strerror(errno));
free(name);
return(NULL);
}
#ifdef LOADER_VERIEXEC_VECTX
vctx = vectx_open(fd, name, 0L, NULL, &verror, __func__);
if (verror) {
sprintf(command_errbuf, "can't verify '%s': %s",
name, ve_error_get());
free(name);
free(vctx);
close(fd);
return(NULL);
}
#else
#ifdef LOADER_VERIEXEC
if (verify_file(fd, name, 0, VE_MUST, __func__) < 0) {
sprintf(command_errbuf, "can't verify '%s': %s",
name, ve_error_get());
free(name);
close(fd);
return(NULL);
}
#endif
#endif
if (archsw.arch_loadaddr != NULL)
loadaddr = archsw.arch_loadaddr(LOAD_RAW, name, loadaddr);
printf("%s ", name);
laddr = loadaddr;
for (;;) {
/* read in 4k chunks; size is not really important */
got = archsw.arch_readin(VECTX_HANDLE(fd), laddr, 4096);
if (got == 0) /* end of file */
break;
if (got < 0) { /* error */
snprintf(command_errbuf, sizeof(command_errbuf),
"error reading '%s': %s", name, strerror(errno));
free(name);
close(fd);
#ifdef LOADER_VERIEXEC_VECTX
free(vctx);
#endif
return(NULL);
}
laddr += got;
}
printf("size=%#jx\n", (uintmax_t)(laddr - loadaddr));
#ifdef LOADER_VERIEXEC_VECTX
verror = vectx_close(vctx, VE_MUST, __func__);
if (verror) {
free(name);
close(fd);
free(vctx);
return(NULL);
}
#endif
/* Looks OK so far; create & populate control structure */
fp = file_alloc();
if (fp == NULL) {
snprintf(command_errbuf, sizeof (command_errbuf),
"no memory to load %s", name);
free(name);
close(fd);
return (NULL);
}
fp->f_name = name;
fp->f_type = strdup(type);
fp->f_args = NULL;
fp->f_metadata = NULL;
fp->f_loader = -1;
fp->f_addr = loadaddr;
fp->f_size = laddr - loadaddr;
if (fp->f_type == NULL) {
snprintf(command_errbuf, sizeof (command_errbuf),
"no memory to load %s", name);
free(name);
close(fd);
return (NULL);
}
/* recognise space consumption */
loadaddr = laddr;
/* Add to the list of loaded files */
if (insert != 0)
file_insert_tail(fp);
close(fd);
return(fp);
}
/*
* Load the module (name), pass it (argc),(argv), add container file
* to the list of loaded files.
* If module is already loaded just assign new argc/argv.
*/
int
mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
{
struct kernel_module *mp;
int err;
char *filename;
if (file_havepath(modname)) {
printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
return (mod_loadkld(modname, argc, argv));
}
/* see if module is already loaded */
mp = file_findmodule(NULL, modname, verinfo);
if (mp) {
#ifdef moduleargs
free(mp->m_args);
mp->m_args = unargv(argc, argv);
#endif
snprintf(command_errbuf, sizeof(command_errbuf),
"warning: module '%s' already loaded", mp->m_name);
return (0);
}
/* locate file with the module on the search path */
filename = mod_searchmodule(modname, verinfo);
if (filename == NULL) {
snprintf(command_errbuf, sizeof(command_errbuf),
"can't find '%s'", modname);
return (ENOENT);
}
err = mod_loadkld(filename, argc, argv);
free(filename);
return (err);
}
/*
* Load specified KLD. If path is omitted, then try to locate it via
* search path.
*/
int
mod_loadkld(const char *kldname, int argc, char *argv[])
{
struct preloaded_file *fp;
int err;
char *filename;
vm_offset_t loadaddr_saved;
/*
* Get fully qualified KLD name
*/
filename = file_search(kldname, kld_ext_list);
if (filename == NULL) {
snprintf(command_errbuf, sizeof(command_errbuf),
"can't find '%s'", kldname);
return (ENOENT);
}
/*
* Check if KLD already loaded
*/
fp = file_findfile(filename, NULL);
if (fp) {
snprintf(command_errbuf, sizeof(command_errbuf),
"warning: KLD '%s' already loaded", filename);
free(filename);
return (0);
}
do {
err = file_load(filename, loadaddr, &fp);
if (err)
break;
fp->f_args = unargv(argc, argv);
loadaddr_saved = loadaddr;
loadaddr = fp->f_addr + fp->f_size;
file_insert_tail(fp); /* Add to the list of loaded files */
if (file_load_dependencies(fp) != 0) {
err = ENOENT;
file_remove(fp);
loadaddr = loadaddr_saved;
fp = NULL;
break;
}
} while(0);
if (err == EFTYPE) {
snprintf(command_errbuf, sizeof(command_errbuf),
"don't know how to load module '%s'", filename);
}
if (err)
file_discard(fp);
free(filename);
return (err);
}
/*
* Find a file matching (name) and (type).
* NULL may be passed as a wildcard to either.
*/
struct preloaded_file *
file_findfile(const char *name, const char *type)
{
struct preloaded_file *fp;
for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
if (((name == NULL) || !strcmp(name, fp->f_name)) &&
((type == NULL) || !strcmp(type, fp->f_type)))
break;
}
return (fp);
}
/*
* Find a module matching (name) inside of given file.
* NULL may be passed as a wildcard.
*/
struct kernel_module *
file_findmodule(struct preloaded_file *fp, char *modname,
struct mod_depend *verinfo)
{
struct kernel_module *mp, *best;
int bestver, mver;
if (fp == NULL) {
for (fp = preloaded_files; fp; fp = fp->f_next) {
mp = file_findmodule(fp, modname, verinfo);
if (mp)
return (mp);
}
return (NULL);
}
best = NULL;
bestver = 0;
for (mp = fp->f_modules; mp; mp = mp->m_next) {
if (strcmp(modname, mp->m_name) == 0) {
if (verinfo == NULL)
return (mp);
mver = mp->m_version;
if (mver == verinfo->md_ver_preferred)
return (mp);
if (mver >= verinfo->md_ver_minimum &&
mver <= verinfo->md_ver_maximum &&
mver > bestver) {
best = mp;
bestver = mver;
}
}
}
return (best);
}
/*
* Make a copy of (size) bytes of data from (p), and associate them as
* metadata of (type) to the module (mp).
*/
void
file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
{
struct file_metadata *md;
md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
if (md != NULL) {
md->md_size = size;
md->md_type = type;
bcopy(p, md->md_data, size);
md->md_next = fp->f_metadata;
}
fp->f_metadata = md;
}
/*
* Find a metadata object of (type) associated with the file (fp)
*/
struct file_metadata *
file_findmetadata(struct preloaded_file *fp, int type)
{
struct file_metadata *md;
for (md = fp->f_metadata; md != NULL; md = md->md_next)
if (md->md_type == type)
break;
return(md);
}
/*
* Remove all metadata from the file.
*/
void
file_removemetadata(struct preloaded_file *fp)
{
struct file_metadata *md, *next;
for (md = fp->f_metadata; md != NULL; md = next)
{
next = md->md_next;
free(md);
}
fp->f_metadata = NULL;
}
struct file_metadata *
metadata_next(struct file_metadata *md, int type)
{
if (md == NULL)
return (NULL);
while((md = md->md_next) != NULL)
if (md->md_type == type)
break;
return (md);
}
static char *emptyextlist[] = { "", NULL };
/*
* Check if the given file is in place and return full path to it.
*/
static char *
file_lookup(const char *path, const char *name, int namelen, char **extlist)
{
struct stat st;
char *result, *cp, **cpp;
int pathlen, extlen, len;
pathlen = strlen(path);
extlen = 0;
if (extlist == NULL)
extlist = emptyextlist;
for (cpp = extlist; *cpp; cpp++) {
len = strlen(*cpp);
if (len > extlen)
extlen = len;
}
result = malloc(pathlen + namelen + extlen + 2);
if (result == NULL)
return (NULL);
bcopy(path, result, pathlen);
if (pathlen > 0 && result[pathlen - 1] != '/')
result[pathlen++] = '/';
cp = result + pathlen;
bcopy(name, cp, namelen);
cp += namelen;
for (cpp = extlist; *cpp; cpp++) {
strcpy(cp, *cpp);
if (stat(result, &st) == 0 && S_ISREG(st.st_mode))
return result;
}
free(result);
return NULL;
}
/*
* Check if file name have any qualifiers
*/
static int
file_havepath(const char *name)
{
const char *cp;
archsw.arch_getdev(NULL, name, &cp);
return (cp != name || strchr(name, '/') != NULL);
}
/*
* Attempt to find the file (name) on the module searchpath.
* If (name) is qualified in any way, we simply check it and
* return it or NULL. If it is not qualified, then we attempt
* to construct a path using entries in the environment variable
* module_path.
*
* The path we return a pointer to need never be freed, as we manage
* it internally.
*/
static char *
file_search(const char *name, char **extlist)
{
struct moduledir *mdp;
struct stat sb;
char *result;
int namelen;
/* Don't look for nothing */
if (name == NULL)
return(NULL);
if (*name == 0)
return(strdup(name));
if (file_havepath(name)) {
/* Qualified, so just see if it exists */
if (stat(name, &sb) == 0)
return(strdup(name));
return(NULL);
}
moduledir_rebuild();
result = NULL;
namelen = strlen(name);
STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
result = file_lookup(mdp->d_path, name, namelen, extlist);
if (result)
break;
}
return(result);
}
#define INT_ALIGN(base, ptr) ptr = \
(base) + roundup2((ptr) - (base), sizeof(int))
static char *
mod_search_hints(struct moduledir *mdp, const char *modname,
struct mod_depend *verinfo)
{
u_char *cp, *recptr, *bufend, *best;
char *result;
int *intp, bestver, blen, clen, found, ival, modnamelen, reclen;
moduledir_readhints(mdp);
modnamelen = strlen(modname);
found = 0;
result = NULL;
bestver = 0;
if (mdp->d_hints == NULL)
goto bad;
recptr = mdp->d_hints;
bufend = recptr + mdp->d_hintsz;
clen = blen = 0;
best = cp = NULL;
while (recptr < bufend && !found) {
intp = (int*)recptr;
reclen = *intp++;
ival = *intp++;
cp = (u_char*)intp;
switch (ival) {
case MDT_VERSION:
clen = *cp++;
if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
break;
cp += clen;
INT_ALIGN(mdp->d_hints, cp);
ival = *(int*)cp;
cp += sizeof(int);
clen = *cp++;
if (verinfo == NULL || ival == verinfo->md_ver_preferred) {
found = 1;
break;
}
if (ival >= verinfo->md_ver_minimum &&
ival <= verinfo->md_ver_maximum &&
ival > bestver) {
bestver = ival;
best = cp;
blen = clen;
}
break;
default:
break;
}
recptr += reclen + sizeof(int);
}
/*
* Finally check if KLD is in the place
*/
if (found)
result = file_lookup(mdp->d_path, (const char *)cp, clen, NULL);
else if (best)
result = file_lookup(mdp->d_path, (const char *)best, blen, NULL);
bad:
/*
* If nothing found or hints is absent - fallback to the old way
* by using "kldname[.ko]" as module name.
*/
if (!found && !bestver && result == NULL)
result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
return result;
}
static int
getint(void **ptr)
{
int *p = *ptr;
int rv;
p = (int *)roundup2((intptr_t)p, sizeof(int));
rv = *p++;
*ptr = p;
return rv;
}
static void
getstr(void **ptr, char *val)
{
int *p = *ptr;
char *c = (char *)p;
int len = *(uint8_t *)c;
memcpy(val, c + 1, len);
val[len] = 0;
c += len + 1;
*ptr = (void *)c;
}
static int
pnpval_as_int(const char *val, const char *pnpinfo)
{
int rv;
char key[256];
char *cp;
if (pnpinfo == NULL)
return -1;
cp = strchr(val, ';');
key[0] = ' ';
if (cp == NULL)
strlcpy(key + 1, val, sizeof(key) - 1);
else {
memcpy(key + 1, val, cp - val);
key[cp - val + 1] = '\0';
}
strlcat(key, "=", sizeof(key));
if (strncmp(key + 1, pnpinfo, strlen(key + 1)) == 0)
rv = strtol(pnpinfo + strlen(key + 1), NULL, 0);
else {
cp = strstr(pnpinfo, key);
if (cp == NULL)
rv = -1;
else
rv = strtol(cp + strlen(key), NULL, 0);
}
return rv;
}
static void
quoted_strcpy(char *dst, const char *src)
{
char q = ' ';
if (*src == '\'' || *src == '"')
q = *src++;
while (*src && *src != q)
*dst++ = *src++; // XXX backtick quoting
*dst++ = '\0';
// XXX overflow
}
static char *
pnpval_as_str(const char *val, const char *pnpinfo)
{
static char retval[256];
char key[256];
char *cp;
if (pnpinfo == NULL) {
*retval = '\0';
return retval;
}
cp = strchr(val, ';');
key[0] = ' ';
if (cp == NULL)
strlcpy(key + 1, val, sizeof(key) - 1);
else {
memcpy(key + 1, val, cp - val);
key[cp - val + 1] = '\0';
}
strlcat(key, "=", sizeof(key));
if (strncmp(key + 1, pnpinfo, strlen(key + 1)) == 0)
quoted_strcpy(retval, pnpinfo + strlen(key + 1));
else {
cp = strstr(pnpinfo, key);
if (cp == NULL)
strcpy(retval, "MISSING");
else
quoted_strcpy(retval, cp + strlen(key));
}
return retval;
}
static char *
devmatch_search_hints(struct moduledir *mdp, const char *bus, const char *dev, const char *pnpinfo)
{
char val1[256], val2[256];
int ival, len, ents, i, notme, mask, bit, v, found;
void *ptr, *walker, *hints_end;
char *lastmod = NULL, *cp, *s;
moduledir_readhints(mdp);
found = 0;
if (mdp->d_hints == NULL)
goto bad;
walker = mdp->d_hints;
hints_end = walker + mdp->d_hintsz;
while (walker < hints_end && !found) {
len = getint(&walker);
ival = getint(&walker);
ptr = walker;
switch (ival) {
case MDT_VERSION:
getstr(&ptr, val1);
ival = getint(&ptr);
getstr(&ptr, val2);
if (pnp_dump_flag || pnp_verbose_flag)
printf("Version: if %s.%d kmod %s\n", val1, ival, val2);
break;
case MDT_MODULE:
getstr(&ptr, val1);
getstr(&ptr, val2);
if (lastmod)
free(lastmod);
lastmod = strdup(val2);
if (pnp_dump_flag || pnp_verbose_flag)
printf("module %s in %s\n", val1, val1);
break;
case MDT_PNP_INFO:
if (!pnp_dump_flag && !pnp_unbound_flag && lastmod && strcmp(lastmod, "kernel") == 0)
break;
getstr(&ptr, val1);
getstr(&ptr, val2);
ents = getint(&ptr);
if (pnp_dump_flag || pnp_verbose_flag)
printf("PNP info for bus %s format %s %d entries (%s)\n",
val1, val2, ents, lastmod);
if (strcmp(val1, "usb") == 0) {
if (pnp_verbose_flag)
printf("Treating usb as uhub -- bug in source table still?\n");
strcpy(val1, "uhub");
}
if (bus && strcmp(val1, bus) != 0) {
if (pnp_verbose_flag)
printf("Skipped because table for bus %s, looking for %s\n",
val1, bus);
break;
}
for (i = 0; i < ents; i++) {
if (pnp_verbose_flag)
printf("---------- Entry %d ----------\n", i);
if (pnp_dump_flag)
printf(" ");
cp = val2;
notme = 0;
mask = -1;
bit = -1;
do {
switch (*cp) {
/* All integer fields */
case 'I':
case 'J':
case 'G':
case 'L':
case 'M':
ival = getint(&ptr);
if (pnp_dump_flag) {
printf("%#x:", ival);
break;
}
if (bit >= 0 && ((1 << bit) & mask) == 0)
break;
v = pnpval_as_int(cp + 2, pnpinfo);
if (pnp_verbose_flag)
printf("Matching %s (%c) table=%#x tomatch=%#x\n",
cp + 2, *cp, v, ival);
switch (*cp) {
case 'J':
if (ival == -1)
break;
/*FALLTHROUGH*/
case 'I':
if (v != ival)
notme++;
break;
case 'G':
if (v < ival)
notme++;
break;
case 'L':
if (v > ival)
notme++;
break;
case 'M':
mask = ival;
break;
}
break;
/* String fields */
case 'D':
case 'Z':
getstr(&ptr, val1);
if (pnp_dump_flag) {
printf("'%s':", val1);
break;
}
if (*cp == 'D')
break;
s = pnpval_as_str(cp + 2, pnpinfo);
if (strcmp(s, val1) != 0)
notme++;
break;
/* Key override fields, required to be last in the string */
case 'T':
/*
* This is imperfect and only does one key and will be redone
* to be more general for multiple keys. Currently, nothing
* does that.
*/
if (pnp_dump_flag) /* No per-row data stored */
break;
if (cp[strlen(cp) - 1] == ';') /* Skip required ; at end */
cp[strlen(cp) - 1] = '\0'; /* in case it's not there */
if ((s = strstr(pnpinfo, cp + 2)) == NULL)
notme++;
else if (s > pnpinfo && s[-1] != ' ')
notme++;
break;
default:
printf("Unknown field type %c\n:", *cp);
break;
}
bit++;
cp = strchr(cp, ';');
if (cp)
cp++;
} while (cp && *cp);
if (pnp_dump_flag)
printf("\n");
else if (!notme) {
if (!pnp_unbound_flag) {
if (pnp_verbose_flag)
printf("Matches --- %s ---\n", lastmod);
}
found++;
}
}
break;
default:
break;
}
walker = (void *)(len - sizeof(int) + (intptr_t)walker);
}
if (pnp_unbound_flag && found == 0 && *pnpinfo) {
if (pnp_verbose_flag)
printf("------------------------- ");
printf("%s on %s pnpinfo %s", *dev ? dev : "unattached", bus, pnpinfo);
if (pnp_verbose_flag)
printf(" -------------------------");
printf("\n");
}
if (found != 0)
return (lastmod);
free(lastmod);
bad:
return (NULL);
}
/*
* Attempt to locate the file containing the module (name)
*/
static char *
mod_searchmodule(char *name, struct mod_depend *verinfo)
{
struct moduledir *mdp;
char *result;
moduledir_rebuild();
/*
* Now we ready to lookup module in the given directories
*/
result = NULL;
STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
result = mod_search_hints(mdp, name, verinfo);
if (result)
break;
}
return(result);
}
static char *
mod_searchmodule_pnpinfo(const char *bus, const char *pnpinfo)
{
struct moduledir *mdp;
char *result;
moduledir_rebuild();
/*
* Now we ready to lookup module in the given directories
*/
result = NULL;
STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
result = devmatch_search_hints(mdp, bus, NULL, pnpinfo);
if (result)
break;
}
return(result);
}
int
file_addmodule(struct preloaded_file *fp, char *modname, int version,
struct kernel_module **newmp)
{
struct kernel_module *mp;
struct mod_depend mdepend;
bzero(&mdepend, sizeof(mdepend));
mdepend.md_ver_preferred = version;
mp = file_findmodule(fp, modname, &mdepend);
if (mp)
return (EEXIST);
mp = calloc(1, sizeof(struct kernel_module));
if (mp == NULL)
return (ENOMEM);
mp->m_name = strdup(modname);
if (mp->m_name == NULL) {
free(mp);
return (ENOMEM);
}
mp->m_version = version;
mp->m_fp = fp;
mp->m_next = fp->f_modules;
fp->f_modules = mp;
if (newmp)
*newmp = mp;
return (0);
}
/*
* Throw a file away
*/
void
file_discard(struct preloaded_file *fp)
{
struct file_metadata *md, *md1;
struct kernel_module *mp, *mp1;
if (fp == NULL)
return;
md = fp->f_metadata;
while (md) {
md1 = md;
md = md->md_next;
free(md1);
}
mp = fp->f_modules;
while (mp) {
free(mp->m_name);
mp1 = mp;
mp = mp->m_next;
free(mp1);
}
free(fp->f_name);
free(fp->f_type);
free(fp->f_args);
free(fp);
}
/*
* Allocate a new file; must be used instead of malloc()
* to ensure safe initialisation.
*/
struct preloaded_file *
file_alloc(void)
{
return (calloc(1, sizeof(struct preloaded_file)));
}
/*
* Add a module to the chain
*/
static void
file_insert_tail(struct preloaded_file *fp)
{
struct preloaded_file *cm;
/* Append to list of loaded file */
fp->f_next = NULL;
if (preloaded_files == NULL) {
preloaded_files = fp;
} else {
for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
;
cm->f_next = fp;
}
}
/*
* Remove module from the chain
*/
static void
file_remove(struct preloaded_file *fp)
{
struct preloaded_file *cm;
if (preloaded_files == NULL)
return;
if (preloaded_files == fp) {
preloaded_files = fp->f_next;
return;
}
for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next) {
if (cm->f_next == fp) {
cm->f_next = fp->f_next;
return;
}
}
}
static char *
moduledir_fullpath(struct moduledir *mdp, const char *fname)
{
char *cp;
cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
if (cp == NULL)
return NULL;
strcpy(cp, mdp->d_path);
strcat(cp, "/");
strcat(cp, fname);
return (cp);
}
/*
* Read linker.hints file into memory performing some sanity checks.
*/
static void
moduledir_readhints(struct moduledir *mdp)
{
struct stat st;
char *path;
int fd, size, version;
if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
return;
path = moduledir_fullpath(mdp, "linker.hints");
if (stat(path, &st) != 0 ||
st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) ||
st.st_size > LINKER_HINTS_MAX || (fd = open(path, O_RDONLY)) < 0) {
free(path);
mdp->d_flags |= MDIR_NOHINTS;
return;
}
free(path);
size = read(fd, &version, sizeof(version));
if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
goto bad;
size = st.st_size - size;
mdp->d_hints = malloc(size);
if (mdp->d_hints == NULL)
goto bad;
if (read(fd, mdp->d_hints, size) != size)
goto bad;
mdp->d_hintsz = size;
close(fd);
return;
bad:
close(fd);
free(mdp->d_hints);
mdp->d_hints = NULL;
mdp->d_flags |= MDIR_NOHINTS;
return;
}
/*
* Extract directories from the ';' separated list, remove duplicates.
*/
static void
moduledir_rebuild(void)
{
struct moduledir *mdp, *mtmp;
const char *path, *cp, *ep;
size_t cplen;
path = getenv("module_path");
if (path == NULL)
path = default_searchpath;
/*
* Rebuild list of module directories if it changed
*/
STAILQ_FOREACH(mdp, &moduledir_list, d_link)
mdp->d_flags |= MDIR_REMOVED;
for (ep = path; *ep != 0; ep++) {
cp = ep;
for (; *ep != 0 && *ep != ';'; ep++)
;
/*
* Ignore trailing slashes
*/
for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--)
;
STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0)
continue;
mdp->d_flags &= ~MDIR_REMOVED;
break;
}
if (mdp == NULL) {
mdp = malloc(sizeof(*mdp) + cplen + 1);
if (mdp == NULL)
return;
mdp->d_path = (char*)(mdp + 1);
bcopy(cp, mdp->d_path, cplen);
mdp->d_path[cplen] = 0;
mdp->d_hints = NULL;
mdp->d_flags = 0;
STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
}
if (*ep == 0)
break;
}
/*
* Delete unused directories if any
*/
mdp = STAILQ_FIRST(&moduledir_list);
while (mdp) {
if ((mdp->d_flags & MDIR_REMOVED) == 0) {
mdp = STAILQ_NEXT(mdp, d_link);
} else {
free(mdp->d_hints);
mtmp = mdp;
mdp = STAILQ_NEXT(mdp, d_link);
STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link);
free(mtmp);
}
}
return;
}
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