cregit-Linux how code gets into the kernel

Release 4.8 net/802/fddi.c

Directory: net/802
 * 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, <>
 *              fddi.c is based on previous eth.c and tr.c work by
 *                      Ross Biro
 *                      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *                      Mark Evans, <>
 *                      Florian La Roche, <>
 *                      Alan Cox, <>
 *              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
 *              Maciej W. Rozycki       :       IPv6 support

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.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)

static int fddi_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned int len) { int hl = FDDI_K_SNAP_HLEN; struct fddihdr *fddi; if(type != ETH_P_IP && type != ETH_P_IPV6 && 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_IPV6 || 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; }


stephen hemmingerstephen hemminger20.81%112.50%
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adrian bunkadrian bunk10.41%112.50%

/* * 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). */
__be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev) { struct fddihdr *fddi = (struct fddihdr *)skb->data; __be16 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->dev = dev; skb_reset_mac_header(skb); /* point to frame control (FC) */ if(fddi->hdr.llc_8022_1.dsap==0xe0) { skb_pull(skb, FDDI_K_8022_HLEN-3); type = 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; }


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int fddi_change_mtu(struct net_device *dev, int new_mtu) { if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN)) return -EINVAL; dev->mtu = new_mtu; return 0; }


christoph hellwigchristoph hellwig40100.00%1100.00%

EXPORT_SYMBOL(fddi_change_mtu); static const struct header_ops fddi_header_ops = { .create = fddi_header, };
static void fddi_setup(struct net_device *dev) { dev->header_ops = &fddi_header_ops; dev->type = ARPHRD_FDDI; dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */ dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */ dev->addr_len = FDDI_K_ALEN; dev->tx_queue_len = 100; /* Long queues on FDDI */ dev->flags = IFF_BROADCAST | IFF_MULTICAST; memset(dev->broadcast, 0xFF, FDDI_K_ALEN); }


christoph hellwigchristoph hellwig6995.83%150.00%
stephen hemmingerstephen hemminger34.17%150.00%

/** * alloc_fddidev - Register FDDI device * @sizeof_priv: Size of additional driver-private structure to be allocated * for this FDDI device * * Fill in the fields of the device structure with FDDI-generic values. * * Constructs a new net device, complete with a private data area of * size @sizeof_priv. A 32-byte (not bit) alignment is enforced for * this private data area. */
struct net_device *alloc_fddidev(int sizeof_priv) { return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN, fddi_setup); }


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Overall Contributors

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Directory: net/802
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