linux_util.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1994 Christos Zoulas
    5  * Copyright (c) 1995 Frank van der Linden
    6  * Copyright (c) 1995 Scott Bartram
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. The name of the author may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  *      from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 #include <sys/param.h>
   38 #include <sys/bus.h>
   39 #include <sys/conf.h>
   40 #include <sys/fcntl.h>
   41 #include <sys/jail.h>
   42 #include <sys/malloc.h>
   43 #include <sys/kernel.h>
   44 #include <sys/linker_set.h>
   45 #include <sys/namei.h>
   46 #include <sys/proc.h>
   47 #include <sys/sdt.h>
   48 #include <sys/syscallsubr.h>
   49 #include <sys/sysctl.h>
   50 #include <sys/systm.h>
   51 #include <sys/vnode.h>
   52 
   53 #include <net/if.h>
   54 #include <net/if_var.h>
   55 #include <net/if_types.h>
   56 
   57 #include <machine/stdarg.h>
   58 
   59 #include <compat/linux/linux_dtrace.h>
   60 #include <compat/linux/linux_mib.h>
   61 #include <compat/linux/linux_util.h>
   62 
   63 MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
   64 MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures");
   65 
   66 FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator");
   67 FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator");
   68 
   69 /**
   70  * Special DTrace provider for the linuxulator.
   71  *
   72  * In this file we define the provider for the entire linuxulator. All
   73  * modules (= files of the linuxulator) use it.
   74  *
   75  * We define a different name depending on the emulated bitsize, see
   76  * ../../<ARCH>/linux{,32}/linux.h, e.g.:
   77  *      native bitsize          = linuxulator
   78  *      amd64, 32bit emulation  = linuxulator32
   79  */
   80 LIN_SDT_PROVIDER_DEFINE(linuxulator);
   81 LIN_SDT_PROVIDER_DEFINE(linuxulator32);
   82 
   83 char linux_emul_path[MAXPATHLEN] = "/compat/linux";
   84 
   85 SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN,
   86     linux_emul_path, sizeof(linux_emul_path),
   87     "Linux runtime environment path");
   88 
   89 static bool use_real_ifnames = false;
   90 SYSCTL_BOOL(_compat_linux, OID_AUTO, use_real_ifnames, CTLFLAG_RWTUN,
   91     &use_real_ifnames, 0,
   92     "Use FreeBSD interface names instead of generating ethN aliases");
   93 
   94 /*
   95  * Search an alternate path before passing pathname arguments on to
   96  * system calls. Useful for keeping a separate 'emulation tree'.
   97  *
   98  * If cflag is set, we check if an attempt can be made to create the
   99  * named file, i.e. we check if the directory it should be in exists.
  100  */
  101 int
  102 linux_emul_convpath(const char *path, enum uio_seg pathseg,
  103     char **pbuf, int cflag, int dfd)
  104 {
  105         int retval;
  106 
  107         retval = kern_alternate_path(linux_emul_path, path, pathseg, pbuf,
  108             cflag, dfd);
  109 
  110         return (retval);
  111 }
  112 
  113 void
  114 linux_msg(const struct thread *td, const char *fmt, ...)
  115 {
  116         va_list ap;
  117         struct proc *p;
  118 
  119         if (linux_debug == 0)
  120                 return;
  121 
  122         p = td->td_proc;
  123         printf("linux: jid %d pid %d (%s): ", p->p_ucred->cr_prison->pr_id,
  124             (int)p->p_pid, p->p_comm);
  125         va_start(ap, fmt);
  126         vprintf(fmt, ap);
  127         va_end(ap);
  128         printf("\n");
  129 }
  130 
  131 struct device_element
  132 {
  133         TAILQ_ENTRY(device_element) list;
  134         struct linux_device_handler entry;
  135 };
  136 
  137 static TAILQ_HEAD(, device_element) devices =
  138         TAILQ_HEAD_INITIALIZER(devices);
  139 
  140 static struct linux_device_handler null_handler =
  141         { "mem", "mem", "null", "null", 1, 3, 1};
  142 
  143 DATA_SET(linux_device_handler_set, null_handler);
  144 
  145 char *
  146 linux_driver_get_name_dev(device_t dev)
  147 {
  148         struct device_element *de;
  149         const char *device_name = device_get_name(dev);
  150 
  151         if (device_name == NULL)
  152                 return (NULL);
  153         TAILQ_FOREACH(de, &devices, list) {
  154                 if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
  155                         return (de->entry.linux_driver_name);
  156         }
  157 
  158         return (NULL);
  159 }
  160 
  161 int
  162 linux_driver_get_major_minor(const char *node, int *major, int *minor)
  163 {
  164         struct device_element *de;
  165         unsigned long devno;
  166         size_t sz;
  167 
  168         if (node == NULL || major == NULL || minor == NULL)
  169                 return (1);
  170 
  171         sz = sizeof("pts/") - 1;
  172         if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') {
  173                 /*
  174                  * Linux checks major and minors of the slave device
  175                  * to make sure it's a pty device, so let's make him
  176                  * believe it is.
  177                  */
  178                 devno = strtoul(node + sz, NULL, 10);
  179                 *major = 136 + (devno / 256);
  180                 *minor = devno % 256;
  181                 return (0);
  182         }
  183 
  184         sz = sizeof("dri/card") - 1;
  185         if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') {
  186                 devno = strtoul(node + sz, NULL, 10);
  187                 *major = 226 + (devno / 256);
  188                 *minor = devno % 256;
  189                 return (0);
  190         }
  191         sz = sizeof("dri/controlD") - 1;
  192         if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') {
  193                 devno = strtoul(node + sz, NULL, 10);
  194                 *major = 226 + (devno / 256);
  195                 *minor = devno % 256;
  196                 return (0);
  197         }
  198         sz = sizeof("dri/renderD") - 1;
  199         if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') {
  200                 devno = strtoul(node + sz, NULL, 10);
  201                 *major = 226 + (devno / 256);
  202                 *minor = devno % 256;
  203                 return (0);
  204         }
  205         sz = sizeof("drm/") - 1;
  206         if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') {
  207                 devno = strtoul(node + sz, NULL, 10);
  208                 *major = 226 + (devno / 256);
  209                 *minor = devno % 256;
  210                 return (0);
  211         }
  212 
  213         TAILQ_FOREACH(de, &devices, list) {
  214                 if (strcmp(node, de->entry.bsd_device_name) == 0) {
  215                         *major = de->entry.linux_major;
  216                         *minor = de->entry.linux_minor;
  217                         return (0);
  218                 }
  219         }
  220 
  221         return (1);
  222 }
  223 
  224 int
  225 linux_vn_get_major_minor(const struct vnode *vp, int *major, int *minor)
  226 {
  227         int error;
  228 
  229         if (vp->v_type != VCHR)
  230                 return (ENOTBLK);
  231         dev_lock();
  232         if (vp->v_rdev == NULL) {
  233                 dev_unlock();
  234                 return (ENXIO);
  235         }
  236         error = linux_driver_get_major_minor(devtoname(vp->v_rdev),
  237             major, minor);
  238         dev_unlock();
  239         return (error);
  240 }
  241 
  242 char *
  243 linux_get_char_devices(void)
  244 {
  245         struct device_element *de;
  246         char *temp, *string, *last;
  247         char formated[256];
  248         int current_size = 0, string_size = 1024;
  249 
  250         string = malloc(string_size, M_LINUX, M_WAITOK);
  251         string[0] = '\000';
  252         last = "";
  253         TAILQ_FOREACH(de, &devices, list) {
  254                 if (!de->entry.linux_char_device)
  255                         continue;
  256                 temp = string;
  257                 if (strcmp(last, de->entry.bsd_driver_name) != 0) {
  258                         last = de->entry.bsd_driver_name;
  259 
  260                         snprintf(formated, sizeof(formated), "%3d %s\n",
  261                                  de->entry.linux_major,
  262                                  de->entry.linux_device_name);
  263                         if (strlen(formated) + current_size
  264                             >= string_size) {
  265                                 string_size *= 2;
  266                                 string = malloc(string_size,
  267                                     M_LINUX, M_WAITOK);
  268                                 bcopy(temp, string, current_size);
  269                                 free(temp, M_LINUX);
  270                         }
  271                         strcat(string, formated);
  272                         current_size = strlen(string);
  273                 }
  274         }
  275 
  276         return (string);
  277 }
  278 
  279 void
  280 linux_free_get_char_devices(char *string)
  281 {
  282 
  283         free(string, M_LINUX);
  284 }
  285 
  286 static int linux_major_starting = 200;
  287 
  288 int
  289 linux_device_register_handler(struct linux_device_handler *d)
  290 {
  291         struct device_element *de;
  292 
  293         if (d == NULL)
  294                 return (EINVAL);
  295 
  296         de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
  297         if (d->linux_major < 0) {
  298                 d->linux_major = linux_major_starting++;
  299         }
  300         bcopy(d, &de->entry, sizeof(*d));
  301 
  302         /* Add the element to the list, sorted on span. */
  303         TAILQ_INSERT_TAIL(&devices, de, list);
  304 
  305         return (0);
  306 }
  307 
  308 int
  309 linux_device_unregister_handler(struct linux_device_handler *d)
  310 {
  311         struct device_element *de;
  312 
  313         if (d == NULL)
  314                 return (EINVAL);
  315 
  316         TAILQ_FOREACH(de, &devices, list) {
  317                 if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
  318                         TAILQ_REMOVE(&devices, de, list);
  319                         free(de, M_LINUX);
  320 
  321                         return (0);
  322                 }
  323         }
  324 
  325         return (EINVAL);
  326 }
  327 
  328 bool
  329 linux_use_real_ifname(const struct ifnet *ifp)
  330 {
  331         return (use_real_ifnames || !IFP_IS_ETH(ifp));
  332 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_util.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_util.c
