| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic HDLC support routines for Linux |
| 3 | * HDLC Ethernet emulation support |
| 4 | * |
| 5 | * Copyright (C) 2002-2003 Krzysztof Halasa <khc@pm.waw.pl> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of version 2 of the GNU General Public License |
| 9 | * as published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/poll.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/if_arp.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/skbuff.h> |
| 20 | #include <linux/pkt_sched.h> |
| 21 | #include <linux/random.h> |
| 22 | #include <linux/inetdevice.h> |
| 23 | #include <linux/lapb.h> |
| 24 | #include <linux/rtnetlink.h> |
| 25 | #include <linux/etherdevice.h> |
| 26 | #include <linux/hdlc.h> |
| 27 | |
| 28 | |
| 29 | static int eth_tx(struct sk_buff *skb, struct net_device *dev) |
| 30 | { |
| 31 | int pad = ETH_ZLEN - skb->len; |
| 32 | if (pad > 0) { /* Pad the frame with zeros */ |
| 33 | int len = skb->len; |
| 34 | if (skb_tailroom(skb) < pad) |
| 35 | if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) { |
| 36 | hdlc_stats(dev)->tx_dropped++; |
| 37 | dev_kfree_skb(skb); |
| 38 | return 0; |
| 39 | } |
| 40 | skb_put(skb, pad); |
| 41 | memset(skb->data + len, 0, pad); |
| 42 | } |
| 43 | return dev_to_hdlc(dev)->xmit(skb, dev); |
| 44 | } |
| 45 | |
| 46 | |
| 47 | int hdlc_raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr) |
| 48 | { |
| 49 | raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc; |
| 50 | const size_t size = sizeof(raw_hdlc_proto); |
| 51 | raw_hdlc_proto new_settings; |
| 52 | hdlc_device *hdlc = dev_to_hdlc(dev); |
| 53 | int result; |
| 54 | void *old_ch_mtu; |
| 55 | int old_qlen; |
| 56 | |
| 57 | switch (ifr->ifr_settings.type) { |
| 58 | case IF_GET_PROTO: |
| 59 | ifr->ifr_settings.type = IF_PROTO_HDLC_ETH; |
| 60 | if (ifr->ifr_settings.size < size) { |
| 61 | ifr->ifr_settings.size = size; /* data size wanted */ |
| 62 | return -ENOBUFS; |
| 63 | } |
| 64 | if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size)) |
| 65 | return -EFAULT; |
| 66 | return 0; |
| 67 | |
| 68 | case IF_PROTO_HDLC_ETH: |
| 69 | if (!capable(CAP_NET_ADMIN)) |
| 70 | return -EPERM; |
| 71 | |
| 72 | if (dev->flags & IFF_UP) |
| 73 | return -EBUSY; |
| 74 | |
| 75 | if (copy_from_user(&new_settings, raw_s, size)) |
| 76 | return -EFAULT; |
| 77 | |
| 78 | if (new_settings.encoding == ENCODING_DEFAULT) |
| 79 | new_settings.encoding = ENCODING_NRZ; |
| 80 | |
| 81 | if (new_settings.parity == PARITY_DEFAULT) |
| 82 | new_settings.parity = PARITY_CRC16_PR1_CCITT; |
| 83 | |
| 84 | result = hdlc->attach(dev, new_settings.encoding, |
| 85 | new_settings.parity); |
| 86 | if (result) |
| 87 | return result; |
| 88 | |
| 89 | hdlc_proto_detach(hdlc); |
| 90 | memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size); |
| 91 | memset(&hdlc->proto, 0, sizeof(hdlc->proto)); |
| 92 | |
| 93 | hdlc->proto.type_trans = eth_type_trans; |
| 94 | hdlc->proto.id = IF_PROTO_HDLC_ETH; |
| 95 | dev->hard_start_xmit = eth_tx; |
| 96 | old_ch_mtu = dev->change_mtu; |
| 97 | old_qlen = dev->tx_queue_len; |
| 98 | ether_setup(dev); |
| 99 | dev->change_mtu = old_ch_mtu; |
| 100 | dev->tx_queue_len = old_qlen; |
| 101 | memcpy(dev->dev_addr, "\x00\x01", 2); |
| 102 | get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2); |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | return -EINVAL; |
| 107 | } |