arch/sparc64/solaris/socksys.c

   1 /* $Id: socksys.c,v 1.21 2002/02/08 03:57:14 davem Exp $
   2  * socksys.c: /dev/inet/ stuff for Solaris emulation.
   3  *
   4  * Copyright (C) 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   5  * Copyright (C) 1997, 1998 Patrik Rak (prak3264@ss1000.ms.mff.cuni.cz)
   6  * Copyright (C) 1995, 1996 Mike Jagdis (jaggy@purplet.demon.co.uk)
   7  */
   8
   9 /*
  10  *  Dave, _please_ give me specifications on this fscking mess so that I
  11  * could at least get it into the state when it wouldn't screw the rest of
  12  * the kernel over.  socksys.c and timod.c _stink_ and we are not talking
  13  * H2S here, it's isopropilmercaptan in concentrations way over LD50. -- AV
  14  */
  15
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/smp.h>
  20 #include <linux/smp_lock.h>
  21 #include <linux/ioctl.h>
  22 #include <linux/fs.h>
  23 #include <linux/file.h>
  24 #include <linux/init.h>
  25 #include <linux/poll.h>
  26 #include <linux/slab.h>
  27 #include <linux/syscalls.h>
  28 #include <linux/in.h>
  29 #include <linux/devfs_fs_kernel.h>
  30
  31 #include <net/sock.h>
  32
  33 #include <asm/uaccess.h>
  34 #include <asm/termios.h>
  35
  36 #include "conv.h"
  37 #include "socksys.h"
  38
  39 static int af_inet_protocols[] = {
  40 IPPROTO_ICMP, IPPROTO_ICMP, IPPROTO_IGMP, IPPROTO_IPIP, IPPROTO_TCP,
  41 IPPROTO_EGP, IPPROTO_PUP, IPPROTO_UDP, IPPROTO_IDP, IPPROTO_RAW,
  42 0, 0, 0, 0, 0, 0,
  43 };
  44
  45 #ifndef DEBUG_SOLARIS_KMALLOC
  46
  47 #define mykmalloc kmalloc
  48 #define mykfree kfree
  49
  50 #else
  51
  52 extern void * mykmalloc(size_t s, int gfp);
  53 extern void mykfree(void *);
  54
  55 #endif
  56
  57 static unsigned int (*sock_poll)(struct file *, poll_table *);
  58
  59 static struct file_operations socksys_file_ops = {
  60         /* Currently empty */
  61 };
  62
  63 static int socksys_open(struct inode * inode, struct file * filp)
  64 {
  65         int family, type, protocol, fd;
  66         struct dentry *dentry;
  67         int (*sys_socket)(int,int,int) =
  68                 (int (*)(int,int,int))SUNOS(97);
  69         struct sol_socket_struct * sock;
  70
  71         family = ((iminor(inode) >> 4) & 0xf);
  72         switch (family) {
  73         case AF_UNIX:
  74                 type = SOCK_STREAM;
  75                 protocol = 0;
  76                 break;
  77         case AF_INET:
  78                 protocol = af_inet_protocols[iminor(inode) & 0xf];
  79                 switch (protocol) {
  80                 case IPPROTO_TCP: type = SOCK_STREAM; break;
  81                 case IPPROTO_UDP: type = SOCK_DGRAM; break;
  82                 default: type = SOCK_RAW; break;
  83                 }
  84                 break;
  85         default:
  86                 type = SOCK_RAW;
  87                 protocol = 0;
  88                 break;
  89         }
  90
  91         fd = sys_socket(family, type, protocol);
  92         if (fd < 0)
  93                 return fd;
  94         /*
  95          * N.B. The following operations are not legal!
  96          *
  97          * No shit.  WTF is it supposed to do, anyway?
  98          *
  99          * Try instead:
 100          * d_delete(filp->f_dentry), then d_instantiate with sock inode
 101          */
 102         dentry = filp->f_dentry;
 103         filp->f_dentry = dget(fcheck(fd)->f_dentry);
 104         filp->f_dentry->d_inode->i_rdev = inode->i_rdev;
 105         filp->f_dentry->d_inode->i_flock = inode->i_flock;
 106         SOCKET_I(filp->f_dentry->d_inode)->file = filp;
 107         filp->f_op = &socksys_file_ops;
 108         sock = (struct sol_socket_struct*)
 109                 mykmalloc(sizeof(struct sol_socket_struct), GFP_KERNEL);
 110         if (!sock) return -ENOMEM;
 111         SOLDD(("sock=%016lx(%016lx)\n", sock, filp));
 112         sock->magic = SOLARIS_SOCKET_MAGIC;
 113         sock->modcount = 0;
 114         sock->state = TS_UNBND;
 115         sock->offset = 0;
 116         sock->pfirst = sock->plast = NULL;
 117         filp->private_data = sock;
 118         SOLDD(("filp->private_data %016lx\n", filp->private_data));
 119
 120         sys_close(fd);
 121         dput(dentry);
 122         return 0;
 123 }
 124
 125 static int socksys_release(struct inode * inode, struct file * filp)
 126 {
 127         struct sol_socket_struct * sock;
 128         struct T_primsg *it;
 129
 130         /* XXX: check this */
 131         sock = (struct sol_socket_struct *)filp->private_data;
 132         SOLDD(("sock release %016lx(%016lx)\n", sock, filp));
 133         it = sock->pfirst;
 134         while (it) {
 135                 struct T_primsg *next = it->next;
 136
 137                 SOLDD(("socksys_release %016lx->%016lx\n", it, next));
 138                 mykfree((char*)it);
 139                 it = next;
 140         }
 141         filp->private_data = NULL;
 142         SOLDD(("socksys_release %016lx\n", sock));
 143         mykfree((char*)sock);
 144         return 0;
 145 }
 146
 147 static unsigned int socksys_poll(struct file * filp, poll_table * wait)
 148 {
 149         struct inode *ino;
 150         unsigned int mask = 0;
 151
 152         ino=filp->f_dentry->d_inode;
 153         if (ino && S_ISSOCK(ino->i_mode)) {
 154                 struct sol_socket_struct *sock;
 155                 sock = (struct sol_socket_struct*)filp->private_data;
 156                 if (sock && sock->pfirst) {
 157                         mask |= POLLIN | POLLRDNORM;
 158                         if (sock->pfirst->pri == MSG_HIPRI)
 159                                 mask |= POLLPRI;
 160                 }
 161         }
 162         if (sock_poll)
 163                 mask |= (*sock_poll)(filp, wait);
 164         return mask;
 165 }
 166
 167 static struct file_operations socksys_fops = {
 168         .open =         socksys_open,
 169         .release =      socksys_release,
 170 };
 171
 172 int __init
 173 init_socksys(void)
 174 {
 175         int ret;
 176         struct file * file;
 177         int (*sys_socket)(int,int,int) =
 178                 (int (*)(int,int,int))SUNOS(97);
 179         int (*sys_close)(unsigned int) =
 180                 (int (*)(unsigned int))SYS(close);
 181
 182         ret = register_chrdev (30, "socksys", &socksys_fops);
 183         if (ret < 0) {
 184                 printk ("Couldn't register socksys character device\n");
 185                 return ret;
 186         }
 187         ret = sys_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 188         if (ret < 0) {
 189                 printk ("Couldn't create socket\n");
 190                 return ret;
 191         }
 192
 193         devfs_mk_cdev(MKDEV(30, 0), S_IFCHR|S_IRUSR|S_IWUSR, "socksys");
 194
 195         file = fcheck(ret);
 196         /* N.B. Is this valid? Suppose the f_ops are in a module ... */
 197         socksys_file_ops = *file->f_op;
 198         sys_close(ret);
 199         sock_poll = socksys_file_ops.poll;
 200         socksys_file_ops.poll = socksys_poll;
 201         socksys_file_ops.release = socksys_release;
 202         return 0;
 203 }
 204
 205 void
 206 cleanup_socksys(void)
 207 {
 208         if (unregister_chrdev(30, "socksys"))
 209                 printk ("Couldn't unregister socksys character device\n");
 210         devfs_remove ("socksys");
 211 }