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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 | /* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * FDDI-type device handling. * * Version: @(#)fddi.c 1.0.0 08/12/96 * * Authors: Lawrence V. Stefani, <stefani@lkg.dec.com> * * fddi.c is based on previous eth.c and tr.c work by * Ross Biro, <bir7@leland.Stanford.Edu> * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Mark Evans, <evansmp@uhura.aston.ac.uk> * Florian La Roche, <rzsfl@rz.uni-sb.de> * Alan Cox, <gw4pts@gw4pts.ampr.org> * * This program 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. * * Changes * Alan Cox : New arp/rebuild header */ #include <linux/config.h> #include <asm/segment.h> #include <asm/system.h> #include <linux/types.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/string.h> #include <linux/mm.h> #include <linux/socket.h> #include <linux/in.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/fddidevice.h> #include <linux/if_ether.h> #include <linux/skbuff.h> #include <linux/errno.h> #include <net/arp.h> #include <net/sock.h> /* * Create the FDDI MAC header for an arbitrary protocol layer * * saddr=NULL means use device source address * daddr=NULL means leave destination address (eg unresolved arp) */ int fddi_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len) { int hl = FDDI_K_SNAP_HLEN; struct fddihdr *fddi; if(type != ETH_P_IP && type != ETH_P_ARP) hl=FDDI_K_8022_HLEN-3; fddi = (struct fddihdr *)skb_push(skb, hl); fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF; if(type == ETH_P_IP || type == ETH_P_ARP) { fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP; fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP; fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD; fddi->hdr.llc_snap.oui[0] = 0x00; fddi->hdr.llc_snap.oui[1] = 0x00; fddi->hdr.llc_snap.oui[2] = 0x00; fddi->hdr.llc_snap.ethertype = htons(type); } /* Set the source and destination hardware addresses */ if (saddr != NULL) memcpy(fddi->saddr, saddr, dev->addr_len); else memcpy(fddi->saddr, dev->dev_addr, dev->addr_len); if (daddr != NULL) { memcpy(fddi->daddr, daddr, dev->addr_len); return(hl); } return(-hl); } /* * Rebuild the FDDI MAC header. This is called after an ARP * (or in future other address resolution) has completed on * this sk_buff. We now let ARP fill in the other fields. */ int fddi_rebuild_header(struct sk_buff *skb) { struct fddihdr *fddi = (struct fddihdr *)skb->data; #ifdef CONFIG_INET if (fddi->hdr.llc_snap.ethertype == __constant_htons(ETH_P_IP)) /* Try to get ARP to resolve the header and fill destination address */ return arp_find(fddi->daddr, skb); else #endif { printk("%s: Don't know how to resolve type %02X addresses.\n", skb->dev->name, htons(fddi->hdr.llc_snap.ethertype)); return(0); } } /* * Determine the packet's protocol ID and fill in skb fields. * This routine is called before an incoming packet is passed * up. It's used to fill in specific skb fields and to set * the proper pointer to the start of packet data (skb->data). */ unsigned short fddi_type_trans(struct sk_buff *skb, struct net_device *dev) { struct fddihdr *fddi = (struct fddihdr *)skb->data; unsigned short type; /* * Set mac.raw field to point to FC byte, set data field to point * to start of packet data. Assume 802.2 SNAP frames for now. */ skb->mac.raw = skb->data; /* point to frame control (FC) */ if(fddi->hdr.llc_8022_1.dsap==0xe0) { skb_pull(skb, FDDI_K_8022_HLEN-3); type = __constant_htons(ETH_P_802_2); } else { skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */ type=fddi->hdr.llc_snap.ethertype; } /* Set packet type based on destination address and flag settings */ if (*fddi->daddr & 0x01) { if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0) skb->pkt_type = PACKET_BROADCAST; else skb->pkt_type = PACKET_MULTICAST; } else if (dev->flags & IFF_PROMISC) { if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN)) skb->pkt_type = PACKET_OTHERHOST; } /* Assume 802.2 SNAP frames, for now */ return(type); } |