94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
#include <grub/net/ip.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/net/arp.h>
|
|
#include <grub/net/ethernet.h>
|
|
#include <grub/net.h>
|
|
#include <grub/net/netbuff.h>
|
|
#include <grub/mm.h>
|
|
|
|
grub_uint16_t
|
|
ipchksum(void *ipv, int len)
|
|
{
|
|
grub_uint16_t *ip = (grub_uint16_t *)ipv;
|
|
grub_uint32_t sum = 0;
|
|
|
|
len >>= 1;
|
|
while (len--)
|
|
{
|
|
sum += grub_be_to_cpu16 (*(ip++));
|
|
if (sum > 0xFFFF)
|
|
sum -= 0xFFFF;
|
|
}
|
|
|
|
return grub_cpu_to_be16 ((~sum) & 0x0000FFFF);
|
|
}
|
|
|
|
grub_err_t
|
|
grub_net_send_ip_packet (struct grub_net_network_level_interface *inf,
|
|
const grub_net_network_level_address_t *target,
|
|
struct grub_net_buff *nb)
|
|
{
|
|
struct iphdr *iph;
|
|
static int id = 0x2400;
|
|
grub_net_link_level_address_t ll_target_addr;
|
|
grub_err_t err;
|
|
|
|
grub_netbuff_push(nb,sizeof(*iph));
|
|
iph = (struct iphdr *) nb->data;
|
|
|
|
iph->verhdrlen = ((4 << 4) | 5);
|
|
iph->service = 0;
|
|
iph->len = grub_cpu_to_be16 (nb->tail - nb-> data);
|
|
iph->ident = grub_cpu_to_be16 (++id);
|
|
iph->frags = 0;
|
|
iph->ttl = 0xff;
|
|
iph->protocol = 0x11;
|
|
iph->src = inf->address.ipv4;
|
|
iph->dest = target->ipv4;
|
|
|
|
iph->chksum = 0 ;
|
|
iph->chksum = ipchksum((void *)nb->data, sizeof(*iph));
|
|
|
|
/* Determine link layer target address via ARP */
|
|
err = grub_net_arp_resolve(inf, target, &ll_target_addr);
|
|
if (err)
|
|
return err;
|
|
|
|
return send_ethernet_packet (inf, nb, ll_target_addr, GRUB_NET_ETHERTYPE_IP);
|
|
}
|
|
|
|
static int
|
|
ip_filter (struct grub_net_buff *nb,
|
|
struct grub_net_network_level_interface *inf)
|
|
{
|
|
struct iphdr *iph = (struct iphdr *) nb->data;
|
|
grub_err_t err;
|
|
|
|
if (nb->end - nb->data < (signed) sizeof (*iph))
|
|
return 0;
|
|
|
|
if (iph->protocol != 0x11 ||
|
|
iph->dest != inf->address.ipv4)
|
|
return 0;
|
|
|
|
grub_netbuff_pull (nb, sizeof (iph));
|
|
err = grub_net_put_packet (&inf->nl_pending, nb);
|
|
if (err)
|
|
{
|
|
grub_print_error ();
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
grub_err_t
|
|
grub_net_recv_ip_packets (struct grub_net_network_level_interface *inf)
|
|
{
|
|
struct grub_net_buff *nb;
|
|
nb = grub_netbuff_alloc (2048);
|
|
if (!nb)
|
|
return grub_errno;
|
|
grub_net_recv_ethernet_packet (inf, nb, GRUB_NET_ETHERTYPE_IP);
|
|
ip_filter (nb, inf);
|
|
return GRUB_ERR_NONE;
|
|
}
|