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193 lines
4.9 KiB
193 lines
4.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* INET An implementation of the TCP/IP protocol suite for the LINUX |
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* operating system. INET is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* HIPPI-type device handling. |
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* |
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* Version: @(#)hippi.c 1.0.0 05/29/97 |
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* |
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* Authors: Ross Biro |
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* Fred N. van Kempen, <[email protected]> |
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* Mark Evans, <[email protected]> |
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* Florian La Roche, <[email protected]> |
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* Alan Cox, <[email protected]> |
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* Jes Sorensen, <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/inet.h> |
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#include <linux/netdevice.h> |
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#include <linux/hippidevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/errno.h> |
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#include <net/arp.h> |
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#include <net/sock.h> |
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#include <linux/uaccess.h> |
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/* |
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* Create the HIPPI MAC header for an arbitrary protocol layer |
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* |
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* saddr=NULL means use device source address |
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* daddr=NULL means leave destination address (eg unresolved arp) |
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*/ |
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static int hippi_header(struct sk_buff *skb, struct net_device *dev, |
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unsigned short type, |
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const void *daddr, const void *saddr, unsigned int len) |
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{ |
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struct hippi_hdr *hip = skb_push(skb, HIPPI_HLEN); |
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struct hippi_cb *hcb = (struct hippi_cb *) skb->cb; |
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if (!len){ |
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len = skb->len - HIPPI_HLEN; |
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printk("hippi_header(): length not supplied\n"); |
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} |
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/* |
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* Due to the stupidity of the little endian byte-order we |
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* have to set the fp field this way. |
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*/ |
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hip->fp.fixed = htonl(0x04800018); |
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hip->fp.d2_size = htonl(len + 8); |
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hip->le.fc = 0; |
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hip->le.double_wide = 0; /* only HIPPI 800 for the time being */ |
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hip->le.message_type = 0; /* Data PDU */ |
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hip->le.dest_addr_type = 2; /* 12 bit SC address */ |
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hip->le.src_addr_type = 2; /* 12 bit SC address */ |
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memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3); |
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memset_startat(&hip->le, 0, reserved); |
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hip->snap.dsap = HIPPI_EXTENDED_SAP; |
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hip->snap.ssap = HIPPI_EXTENDED_SAP; |
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hip->snap.ctrl = HIPPI_UI_CMD; |
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hip->snap.oui[0] = 0x00; |
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hip->snap.oui[1] = 0x00; |
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hip->snap.oui[2] = 0x00; |
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hip->snap.ethertype = htons(type); |
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if (daddr) |
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{ |
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memcpy(hip->le.dest_switch_addr, daddr + 3, 3); |
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memcpy(&hcb->ifield, daddr + 2, 4); |
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return HIPPI_HLEN; |
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} |
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hcb->ifield = 0; |
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return -((int)HIPPI_HLEN); |
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} |
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/* |
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* Determine the packet's protocol ID. |
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*/ |
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__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct hippi_hdr *hip; |
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/* |
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* This is actually wrong ... question is if we really should |
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* set the raw address here. |
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*/ |
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skb->dev = dev; |
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skb_reset_mac_header(skb); |
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hip = (struct hippi_hdr *)skb_mac_header(skb); |
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skb_pull(skb, HIPPI_HLEN); |
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/* |
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* No fancy promisc stuff here now. |
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*/ |
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return hip->snap.ethertype; |
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} |
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EXPORT_SYMBOL(hippi_type_trans); |
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/* |
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* For HIPPI we will actually use the lower 4 bytes of the hardware |
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* address as the I-FIELD rather than the actual hardware address. |
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*/ |
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int hippi_mac_addr(struct net_device *dev, void *p) |
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{ |
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struct sockaddr *addr = p; |
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if (netif_running(dev)) |
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return -EBUSY; |
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dev_addr_set(dev, addr->sa_data); |
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return 0; |
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} |
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EXPORT_SYMBOL(hippi_mac_addr); |
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int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) |
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{ |
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/* Never send broadcast/multicast ARP messages */ |
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NEIGH_VAR_INIT(p, MCAST_PROBES, 0); |
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/* In IPv6 unicast probes are valid even on NBMA, |
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* because they are encapsulated in normal IPv6 protocol. |
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* Should be a generic flag. |
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*/ |
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if (p->tbl->family != AF_INET6) |
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NEIGH_VAR_INIT(p, UCAST_PROBES, 0); |
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return 0; |
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} |
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EXPORT_SYMBOL(hippi_neigh_setup_dev); |
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static const struct header_ops hippi_header_ops = { |
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.create = hippi_header, |
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}; |
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static void hippi_setup(struct net_device *dev) |
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{ |
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dev->header_ops = &hippi_header_ops; |
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/* |
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* We don't support HIPPI `ARP' for the time being, and probably |
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* never will unless someone else implements it. However we |
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* still need a fake ARPHRD to make ifconfig and friends play ball. |
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*/ |
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dev->type = ARPHRD_HIPPI; |
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dev->hard_header_len = HIPPI_HLEN; |
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dev->mtu = 65280; |
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dev->min_mtu = 68; |
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dev->max_mtu = 65280; |
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dev->addr_len = HIPPI_ALEN; |
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dev->tx_queue_len = 25 /* 5 */; |
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memset(dev->broadcast, 0xFF, HIPPI_ALEN); |
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/* |
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* HIPPI doesn't support broadcast+multicast and we only use |
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* static ARP tables. ARP is disabled by hippi_neigh_setup_dev. |
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*/ |
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dev->flags = 0; |
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} |
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/** |
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* alloc_hippi_dev - Register HIPPI device |
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* @sizeof_priv: Size of additional driver-private structure to be allocated |
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* for this HIPPI device |
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* |
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* Fill in the fields of the device structure with HIPPI-generic values. |
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* |
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* Constructs a new net device, complete with a private data area of |
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* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for |
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* this private data area. |
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*/ |
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struct net_device *alloc_hippi_dev(int sizeof_priv) |
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{ |
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return alloc_netdev(sizeof_priv, "hip%d", NET_NAME_UNKNOWN, |
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hippi_setup); |
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} |
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EXPORT_SYMBOL(alloc_hippi_dev);
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