130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010,2011 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/net/ethernet.h>
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#include <grub/net/ip.h>
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#include <grub/net/arp.h>
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#include <grub/net/netbuff.h>
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#include <grub/net.h>
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#include <grub/time.h>
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#include <grub/net/arp.h>
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#define LLCADDRMASK 0x7f
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struct etherhdr
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{
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grub_uint8_t dst[6];
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grub_uint8_t src[6];
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grub_uint16_t type;
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} __attribute__ ((packed));
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struct llchdr
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{
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grub_uint8_t dsap;
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grub_uint8_t ssap;
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grub_uint8_t ctrl;
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} __attribute__ ((packed));
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struct snaphdr
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{
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grub_uint8_t oui[3];
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grub_uint16_t type;
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} __attribute__ ((packed));
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grub_err_t
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send_ethernet_packet (struct grub_net_network_level_interface *inf,
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struct grub_net_buff *nb,
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grub_net_link_level_address_t target_addr,
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grub_uint16_t ethertype)
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{
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struct etherhdr *eth;
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grub_err_t err;
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err = grub_netbuff_push (nb, sizeof (*eth));
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if (err)
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return err;
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eth = (struct etherhdr *) nb->data;
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grub_memcpy (eth->dst, target_addr.mac, 6);
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grub_memcpy (eth->src, inf->hwaddress.mac, 6);
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eth->type = grub_cpu_to_be16 (ethertype);
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if (!inf->card->opened)
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{
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err = GRUB_ERR_NONE;
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if (inf->card->driver->open)
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err = inf->card->driver->open (inf->card);
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if (err)
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return err;
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inf->card->opened = 1;
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}
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return inf->card->driver->send (inf->card, nb);
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}
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grub_err_t
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grub_net_recv_ethernet_packet (struct grub_net_buff * nb,
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const struct grub_net_card * card)
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{
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struct etherhdr *eth;
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struct llchdr *llch;
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struct snaphdr *snaph;
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grub_uint16_t type;
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grub_net_link_level_address_t hwaddress;
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grub_err_t err;
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eth = (struct etherhdr *) nb->data;
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type = grub_be_to_cpu16 (eth->type);
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err = grub_netbuff_pull (nb, sizeof (*eth));
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if (err)
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return err;
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if (type <= 1500)
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{
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llch = (struct llchdr *) nb->data;
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type = llch->dsap & LLCADDRMASK;
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if (llch->dsap == 0xaa && llch->ssap == 0xaa && llch->ctrl == 0x3)
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{
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err = grub_netbuff_pull (nb, sizeof (*llch));
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if (err)
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return err;
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snaph = (struct snaphdr *) nb->data;
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type = snaph->type;
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}
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}
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hwaddress.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
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grub_memcpy (hwaddress.mac, eth->dst, sizeof (hwaddress.mac));
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/* ARP packet. */
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if (type == GRUB_NET_ETHERTYPE_ARP)
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{
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grub_net_arp_receive (nb);
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grub_netbuff_free (nb);
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return GRUB_ERR_NONE;
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}
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/* IP packet. */
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if (type == GRUB_NET_ETHERTYPE_IP)
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{
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grub_net_recv_ip_packets (nb, card, &hwaddress);
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return GRUB_ERR_NONE;
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}
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grub_netbuff_free (nb);
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return GRUB_ERR_NONE;
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}
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