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Annotation of linux/net/tcp/eth.c, revision 1.1

1.1     ! root        1: /* eth.c */
        !             2: /*
        !             3:     Copyright (C) 1992  Ross Biro
        !             4: 
        !             5:     This program is free software; you can redistribute it and/or modify
        !             6:     it under the terms of the GNU General Public License as published by
        !             7:     the Free Software Foundation; either version 2, or (at your option)
        !             8:     any later version.
        !             9: 
        !            10:     This program is distributed in the hope that it will be useful,
        !            11:     but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            12:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            13:     GNU General Public License for more details.
        !            14: 
        !            15:     You should have received a copy of the GNU General Public License
        !            16:     along with this program; if not, write to the Free Software
        !            17:     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 
        !            18: 
        !            19:     The Author may be reached as [email protected] or
        !            20:     C/O Department of Mathematics; Stanford University; Stanford, CA 94305
        !            21: */
        !            22: 
        !            23: #include <asm/segment.h>
        !            24: #include <asm/system.h>
        !            25: #include <linux/types.h>
        !            26: #include <linux/kernel.h>
        !            27: #include <linux/sched.h>
        !            28: #include <linux/string.h>
        !            29: #include <linux/mm.h>
        !            30: #include <linux/socket.h>
        !            31: #include <netinet/in.h>
        !            32: #include <asm/memory.h>
        !            33: #include "dev.h"
        !            34: #include "eth.h"
        !            35: #include "timer.h"
        !            36: #include "ip.h"
        !            37: #include "tcp.h"
        !            38: #include "sock.h"
        !            39: #include <linux/errno.h>
        !            40: #include "arp.h"
        !            41: 
        !            42: #undef ETH_DEBUG
        !            43: #ifdef ETH_DEBUG
        !            44: #define PRINTK printk
        !            45: #else
        !            46: #define PRINTK dummy_routine
        !            47: #endif
        !            48: 
        !            49: void
        !            50: print_eth (struct enet_header *eth)
        !            51: {
        !            52:   int i;
        !            53:   PRINTK ("ether source addr: ");
        !            54:   for (i =0 ; i < ETHER_ADDR_LEN; i++)
        !            55:     {
        !            56:       PRINTK ("0x%2X ",eth->saddr[i]);
        !            57:     }
        !            58:   PRINTK ("\n");
        !            59: 
        !            60:   PRINTK ("ether dest addr: ");
        !            61:   for (i =0 ; i < ETHER_ADDR_LEN; i++)
        !            62:     {
        !            63:       PRINTK ("0x%2X ",eth->daddr[i]);
        !            64:     }
        !            65:   PRINTK ("\n");
        !            66:   PRINTK ("ethertype = %X\n",net16(eth->type));
        !            67: }
        !            68: 
        !            69: int
        !            70: eth_hard_header (unsigned char *buff, struct device *dev,
        !            71:                 unsigned short type, unsigned long daddr,
        !            72:                 unsigned long saddr, unsigned len)
        !            73: {
        !            74:   struct enet_header *eth;
        !            75:   eth = (struct enet_header *)buff;
        !            76:   eth->type = net16(type);
        !            77:   memcpy (eth->saddr, dev->dev_addr, dev->addr_len);
        !            78:   if (daddr == 0)
        !            79:     {
        !            80:       memset (eth->daddr, 0xff, dev->addr_len);
        !            81:       return (14);
        !            82:     }
        !            83:   if (!arp_find (eth->daddr, daddr, dev, saddr))
        !            84:     {
        !            85:       return (14);
        !            86:     }
        !            87:   else
        !            88:     {
        !            89:       *(unsigned long *)eth->saddr = saddr;
        !            90:        return (-14);
        !            91:     }
        !            92: }
        !            93: 
        !            94: int
        !            95: eth_rebuild_header (void *buff, struct device *dev)
        !            96: {
        !            97:   struct enet_header *eth;
        !            98:   eth = buff;
        !            99:   if (arp_find(eth->daddr, *(unsigned long*)eth->daddr, dev, 
        !           100:                   *(unsigned long *)eth->saddr))
        !           101:     return (1);
        !           102:   memcpy (eth->saddr, dev->dev_addr, dev->addr_len);
        !           103:   return (0);
        !           104: }
        !           105: 
        !           106: void
        !           107: eth_add_arp (unsigned long addr, struct sk_buff *skb, struct device *dev)
        !           108: {
        !           109:    struct enet_header *eh;
        !           110:    eh = (struct enet_header *)(skb + 1);
        !           111:    arp_add (addr, eh->saddr, dev);
        !           112: }
        !           113: 
        !           114: unsigned short
        !           115: eth_type_trans (struct sk_buff *skb, struct device *dev)
        !           116: {
        !           117:    struct enet_header *eh;
        !           118:    eh = (struct enet_header *)(skb + 1);
        !           119:    return (eh->type);
        !           120: }

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