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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | /* * linux/fs/proc/net.c * * Copyright (C) 1991, 1992 Linus Torvalds * * gjh 3/'93 heim@peanuts.informatik.uni-tuebingen.de (Gerald J. Heim) * most of this file is stolen from base.c * it works, but you shouldn't use it as a guideline * for new proc-fs entries. once i'll make it better. * fvk 3/'93 waltje@uwalt.nl.mugnet.org (Fred N. van Kempen) * cleaned up the whole thing, moved "net" specific code to * the NET kernel layer (where it belonged in the first place). * Michael K. Johnson (johnsonm@stolaf.edu) 3/93 * Added support from my previous inet.c. Cleaned things up * quite a bit, modularized the code. * fvk 4/'93 waltje@uwalt.nl.mugnet.org (Fred N. van Kempen) * Renamed "route_get_info()" to "rt_get_info()" for consistency. * Alan Cox (alan@lxorguk.ukuu.org.uk) 4/94 * Dusted off the code and added IPX. Fixed the 4K limit. * Erik Schoenfelder (schoenfr@ibr.cs.tu-bs.de) * /proc/net/snmp. * Alan Cox (alan@lxorguk.ukuu.org.uk) 1/95 * Added Appletalk slots * * proc net directory handling functions */ #include <linux/errno.h> #include <linux/sched.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <linux/fcntl.h> #include <linux/mm.h> #include <asm/segment.h> #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ static int proc_readnet(struct inode * inode, struct file * file, char * buf, int count) { char * page; int bytes=count; int copied=0; char *start; struct proc_dir_entry * dp; if (count < 0) return -EINVAL; dp = (struct proc_dir_entry *) inode->u.generic_ip; if (!(page = (char*) __get_free_page(GFP_KERNEL))) return -ENOMEM; while (bytes>0) { int length, thistime=bytes; if (bytes > PROC_BLOCK_SIZE) thistime=PROC_BLOCK_SIZE; length = dp->get_info(page, &start, file->f_pos, thistime, (file->f_flags & O_ACCMODE) == O_RDWR); /* * We have been given a non page aligned block of * the data we asked for + a bit. We have been given * the start pointer and we know the length.. */ if (length <= 0) break; /* * Copy the bytes */ memcpy_tofs(buf+copied, start, length); file->f_pos += length; /* Move down the file */ bytes -= length; copied += length; if (length<thistime) break; /* End of file */ } free_page((unsigned long) page); return copied; } static struct file_operations proc_net_operations = { NULL, /* lseek - default */ proc_readnet, /* read - bad */ NULL, /* write - bad */ NULL, /* readdir */ NULL, /* select - default */ NULL, /* ioctl - default */ NULL, /* mmap */ NULL, /* no special open code */ NULL, /* no special release code */ NULL /* can't fsync */ }; /* * proc directories can do almost nothing.. */ struct inode_operations proc_net_inode_operations = { &proc_net_operations, /* default net file-ops */ NULL, /* create */ NULL, /* lookup */ NULL, /* link */ NULL, /* unlink */ NULL, /* symlink */ NULL, /* mkdir */ NULL, /* rmdir */ NULL, /* mknod */ NULL, /* rename */ NULL, /* readlink */ NULL, /* follow_link */ NULL, /* readpage */ NULL, /* writepage */ NULL, /* bmap */ NULL, /* truncate */ NULL /* permission */ }; |