diff options
Diffstat (limited to 'pfinet/linux-inet/rarp.c')
| -rw-r--r-- | pfinet/linux-inet/rarp.c | 491 |
1 files changed, 0 insertions, 491 deletions
diff --git a/pfinet/linux-inet/rarp.c b/pfinet/linux-inet/rarp.c deleted file mode 100644 index 72924bb2..00000000 --- a/pfinet/linux-inet/rarp.c +++ /dev/null @@ -1,491 +0,0 @@ -/* linux/net/inet/rarp.c - * - * Copyright (C) 1994 by Ross Martin - * Based on linux/net/inet/arp.c, Copyright (C) 1994 by Florian La Roche - * - * This module implements the Reverse Address Resolution Protocol - * (RARP, RFC 903), which is used to convert low level addresses such - * as ethernet addresses into high level addresses such as IP addresses. - * The most common use of RARP is as a means for a diskless workstation - * to discover its IP address during a network boot. - * - ** - *** WARNING:::::::::::::::::::::::::::::::::WARNING - **** - ***** SUN machines seem determined to boot solely from the person who - **** answered their RARP query. NEVER add a SUN to your RARP table - *** unless you have all the rest to boot the box from it. - ** - * - * Currently, only ethernet address -> IP address is likely to work. - * (Is RARP ever used for anything else?) - * - * This code is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - * - */ - -#include <linux/types.h> -#include <linux/string.h> -#include <linux/kernel.h> -#include <linux/sched.h> -#include <linux/mm.h> -#include <linux/config.h> -#include <linux/socket.h> -#include <linux/sockios.h> -#include <linux/errno.h> -#include <linux/if_arp.h> -#include <linux/in.h> -#include <asm/system.h> -#include <asm/segment.h> -#include <stdarg.h> -#include <linux/inet.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include "ip.h" -#include "route.h" -#include "protocol.h" -#include "tcp.h" -#include <linux/skbuff.h> -#include "sock.h" -#include "arp.h" -#include "rarp.h" -#ifdef CONFIG_AX25 -#include "ax25.h" -#endif - -#ifdef CONFIG_INET_RARP - -/* - * This structure defines the RARP mapping cache. As long as we make - * changes in this structure, we keep interrupts off. - */ - -struct rarp_table -{ - struct rarp_table *next; /* Linked entry list */ - unsigned long ip; /* ip address of entry */ - unsigned char ha[MAX_ADDR_LEN]; /* Hardware address */ - unsigned char hlen; /* Length of hardware address */ - unsigned char htype; /* Type of hardware in use */ - struct device *dev; /* Device the entry is tied to */ -}; - -struct rarp_table *rarp_tables = NULL; - - -static struct packet_type rarp_packet_type = -{ - 0, /* Should be: __constant_htons(ETH_P_RARP) - but this _doesn't_ come out constant! */ - 0, /* copy */ - rarp_rcv, - NULL, - NULL -}; - -static initflag = 1; - -/* - * Called once when data first added to rarp cache with ioctl. - */ - -static void rarp_init (void) -{ - /* Register the packet type */ - rarp_packet_type.type=htons(ETH_P_RARP); - dev_add_pack(&rarp_packet_type); -} - -/* - * Release the memory for this entry. - */ - -static inline void rarp_release_entry(struct rarp_table *entry) -{ - kfree_s(entry, sizeof(struct rarp_table)); - return; -} - -/* - * Delete a RARP mapping entry in the cache. - */ - -static void rarp_destroy(unsigned long ip_addr) -{ - struct rarp_table *entry; - struct rarp_table **pentry; - - cli(); - pentry = &rarp_tables; - while ((entry = *pentry) != NULL) - { - if (entry->ip == ip_addr) - { - *pentry = entry->next; - sti(); - rarp_release_entry(entry); - return; - } - pentry = &entry->next; - } - sti(); -} - - -/* - * Receive an arp request by the device layer. Maybe it should be - * rewritten to use the incoming packet for the reply. The current - * "overhead" time isn't that high... - */ - -int rarp_rcv(struct sk_buff *skb, struct device *dev, struct packet_type *pt) -{ -/* - * We shouldn't use this type conversion. Check later. - */ - struct arphdr *rarp = (struct arphdr *)skb->h.raw; - unsigned char *rarp_ptr = (unsigned char *)(rarp+1); - struct rarp_table *entry; - long sip,tip; - unsigned char *sha,*tha; /* s for "source", t for "target" */ - -/* - * If this test doesn't pass, it's not IP, or we should ignore it anyway - */ - - if (rarp->ar_hln != dev->addr_len || dev->type != ntohs(rarp->ar_hrd) - || dev->flags&IFF_NOARP) - { - kfree_skb(skb, FREE_READ); - return 0; - } - -/* - * If it's not a RARP request, delete it. - */ - if (rarp->ar_op != htons(ARPOP_RREQUEST)) - { - kfree_skb(skb, FREE_READ); - return 0; - } - -/* - * For now we will only deal with IP addresses. - */ - - if ( -#ifdef CONFIG_AX25 - (rarp->ar_pro != htons(AX25_P_IP) && dev->type == ARPHRD_AX25) || -#endif - (rarp->ar_pro != htons(ETH_P_IP) && dev->type != ARPHRD_AX25) - || rarp->ar_pln != 4) - { - /* - * This packet is not for us. Remove it. - */ - kfree_skb(skb, FREE_READ); - return 0; -} - -/* - * Extract variable width fields - */ - - sha=rarp_ptr; - rarp_ptr+=dev->addr_len; - memcpy(&sip,rarp_ptr,4); - rarp_ptr+=4; - tha=rarp_ptr; - rarp_ptr+=dev->addr_len; - memcpy(&tip,rarp_ptr,4); - -/* - * Process entry. Use tha for table lookup according to RFC903. - */ - - cli(); - for (entry = rarp_tables; entry != NULL; entry = entry->next) - if (!memcmp(entry->ha, tha, rarp->ar_hln)) - break; - - if (entry != NULL) - { - sip=entry->ip; - sti(); - - arp_send(ARPOP_RREPLY, ETH_P_RARP, sip, dev, dev->pa_addr, sha, - dev->dev_addr); - } - else - sti(); - - kfree_skb(skb, FREE_READ); - return 0; -} - - -/* - * Set (create) a RARP cache entry. - */ - -static int rarp_req_set(struct arpreq *req) -{ - struct arpreq r; - struct rarp_table *entry; - struct sockaddr_in *si; - int htype, hlen; - unsigned long ip; - struct rtable *rt; - - memcpy_fromfs(&r, req, sizeof(r)); - - /* - * We only understand about IP addresses... - */ - - if (r.arp_pa.sa_family != AF_INET) - return -EPFNOSUPPORT; - - switch (r.arp_ha.sa_family) - { - case ARPHRD_ETHER: - htype = ARPHRD_ETHER; - hlen = ETH_ALEN; - break; -#ifdef CONFIG_AX25 - case ARPHRD_AX25: - htype = ARPHRD_AX25; - hlen = 7; - break; -#endif - default: - return -EPFNOSUPPORT; - } - - si = (struct sockaddr_in *) &r.arp_pa; - ip = si->sin_addr.s_addr; - if (ip == 0) - { - printk("RARP: SETRARP: requested PA is 0.0.0.0 !\n"); - return -EINVAL; - } - -/* - * Is it reachable directly ? - */ - - rt = ip_rt_route(ip, NULL, NULL); - if (rt == NULL) - return -ENETUNREACH; - -/* - * Is there an existing entry for this address? Find out... - */ - - cli(); - for (entry = rarp_tables; entry != NULL; entry = entry->next) - if (entry->ip == ip) - break; - -/* - * If no entry was found, create a new one. - */ - - if (entry == NULL) - { - entry = (struct rarp_table *) kmalloc(sizeof(struct rarp_table), - GFP_ATOMIC); - if (entry == NULL) - { - sti(); - return -ENOMEM; - } - if(initflag) - { - rarp_init(); - initflag=0; - } - - entry->next = rarp_tables; - rarp_tables = entry; - } - - entry->ip = ip; - entry->hlen = hlen; - entry->htype = htype; - memcpy(&entry->ha, &r.arp_ha.sa_data, hlen); - entry->dev = rt->rt_dev; - - sti(); - - return 0; -} - - -/* - * Get a RARP cache entry. - */ - -static int rarp_req_get(struct arpreq *req) -{ - struct arpreq r; - struct rarp_table *entry; - struct sockaddr_in *si; - unsigned long ip; - -/* - * We only understand about IP addresses... - */ - - memcpy_fromfs(&r, req, sizeof(r)); - - if (r.arp_pa.sa_family != AF_INET) - return -EPFNOSUPPORT; - -/* - * Is there an existing entry for this address? - */ - - si = (struct sockaddr_in *) &r.arp_pa; - ip = si->sin_addr.s_addr; - - cli(); - for (entry = rarp_tables; entry != NULL; entry = entry->next) - if (entry->ip == ip) - break; - - if (entry == NULL) - { - sti(); - return -ENXIO; - } - -/* - * We found it; copy into structure. - */ - - memcpy(r.arp_ha.sa_data, &entry->ha, entry->hlen); - r.arp_ha.sa_family = entry->htype; - sti(); - -/* - * Copy the information back - */ - - memcpy_tofs(req, &r, sizeof(r)); - return 0; -} - - -/* - * Handle a RARP layer I/O control request. - */ - -int rarp_ioctl(unsigned int cmd, void *arg) -{ - struct arpreq r; - struct sockaddr_in *si; - int err; - - switch(cmd) - { - case SIOCDRARP: - if (!suser()) - return -EPERM; - err = verify_area(VERIFY_READ, arg, sizeof(struct arpreq)); - if(err) - return err; - memcpy_fromfs(&r, arg, sizeof(r)); - if (r.arp_pa.sa_family != AF_INET) - return -EPFNOSUPPORT; - si = (struct sockaddr_in *) &r.arp_pa; - rarp_destroy(si->sin_addr.s_addr); - return 0; - - case SIOCGRARP: - err = verify_area(VERIFY_WRITE, arg, sizeof(struct arpreq)); - if(err) - return err; - return rarp_req_get((struct arpreq *)arg); - case SIOCSRARP: - if (!suser()) - return -EPERM; - err = verify_area(VERIFY_READ, arg, sizeof(struct arpreq)); - if(err) - return err; - return rarp_req_set((struct arpreq *)arg); - default: - return -EINVAL; - } - - /*NOTREACHED*/ - return 0; -} - -int rarp_get_info(char *buffer, char **start, off_t offset, int length) -{ - int len=0; - off_t begin=0; - off_t pos=0; - int size; - struct rarp_table *entry; - char ipbuffer[20]; - unsigned long netip; - if(initflag) - { - size = sprintf(buffer,"RARP disabled until entries added to cache.\n"); - pos+=size; - len+=size; - } - else - { - size = sprintf(buffer, - "IP address HW type HW address\n"); - pos+=size; - len+=size; - - cli(); - for(entry=rarp_tables; entry!=NULL; entry=entry->next) - { - netip=htonl(entry->ip); /* switch to network order */ - sprintf(ipbuffer,"%d.%d.%d.%d", - (unsigned int)(netip>>24)&255, - (unsigned int)(netip>>16)&255, - (unsigned int)(netip>>8)&255, - (unsigned int)(netip)&255); - - size = sprintf(buffer+len, - "%-17s%-20s%02x:%02x:%02x:%02x:%02x:%02x\n", - ipbuffer, - "10Mbps Ethernet", - (unsigned int)entry->ha[0], - (unsigned int)entry->ha[1], - (unsigned int)entry->ha[2], - (unsigned int)entry->ha[3], - (unsigned int)entry->ha[4], - (unsigned int)entry->ha[5]); - - len+=size; - pos=begin+len; - - if(pos<offset) - { - len=0; - begin=pos; - } - if(pos>offset+length) - break; - } - sti(); - } - - *start=buffer+(offset-begin); /* Start of wanted data */ - len-=(offset-begin); /* Start slop */ - if(len>length) - len=length; /* Ending slop */ - return len; -} - -#endif |