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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2010,2011 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/net.h>
#include <grub/net/udp.h>
#include <grub/net/ip.h>
#include <grub/net/netbuff.h>
#include <grub/time.h>
struct grub_net_udp_socket
{
struct grub_net_udp_socket *next;
struct grub_net_udp_socket **prev;
enum { GRUB_NET_SOCKET_START,
GRUB_NET_SOCKET_ESTABLISHED,
GRUB_NET_SOCKET_CLOSED } status;
int in_port;
int out_port;
grub_err_t (*recv_hook) (grub_net_udp_socket_t sock, struct grub_net_buff *nb,
void *recv);
void *recv_hook_data;
grub_net_network_level_address_t out_nla;
grub_net_link_level_address_t ll_target_addr;
struct grub_net_network_level_interface *inf;
};
static struct grub_net_udp_socket *udp_sockets;
#define FOR_UDP_SOCKETS(var) for (var = udp_sockets; var; var = var->next)
static inline void
udp_socket_register (grub_net_udp_socket_t sock)
{
grub_list_push (GRUB_AS_LIST_P (&udp_sockets),
GRUB_AS_LIST (sock));
}
void
grub_net_udp_close (grub_net_udp_socket_t sock)
{
grub_list_remove (GRUB_AS_LIST (sock));
grub_free (sock);
}
grub_net_udp_socket_t
grub_net_udp_open (grub_net_network_level_address_t addr,
grub_uint16_t out_port,
grub_err_t (*recv_hook) (grub_net_udp_socket_t sock,
struct grub_net_buff *nb,
void *data),
void *recv_hook_data)
{
grub_err_t err;
struct grub_net_network_level_interface *inf;
grub_net_network_level_address_t gateway;
grub_net_udp_socket_t socket;
static int in_port = 25300;
grub_net_link_level_address_t ll_target_addr;
if (addr.type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4
&& addr.type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6)
{
grub_error (GRUB_ERR_BUG, "not an IP address");
return NULL;
}
err = grub_net_route_address (addr, &gateway, &inf);
if (err)
return NULL;
err = grub_net_link_layer_resolve (inf, &gateway, &ll_target_addr);
if (err)
return NULL;
socket = grub_zalloc (sizeof (*socket));
if (socket == NULL)
return NULL;
socket->out_port = out_port;
socket->inf = inf;
socket->out_nla = addr;
socket->ll_target_addr = ll_target_addr;
socket->in_port = in_port++;
socket->status = GRUB_NET_SOCKET_START;
socket->recv_hook = recv_hook;
socket->recv_hook_data = recv_hook_data;
udp_socket_register (socket);
return socket;
}
grub_err_t
grub_net_send_udp_packet (const grub_net_udp_socket_t socket,
struct grub_net_buff *nb)
{
struct udphdr *udph;
grub_err_t err;
COMPILE_TIME_ASSERT (GRUB_NET_UDP_HEADER_SIZE == sizeof (*udph));
err = grub_netbuff_push (nb, sizeof (*udph));
if (err)
return err;
udph = (struct udphdr *) nb->data;
udph->src = grub_cpu_to_be16 (socket->in_port);
udph->dst = grub_cpu_to_be16 (socket->out_port);
udph->chksum = 0;
udph->len = grub_cpu_to_be16 (nb->tail - nb->data);
udph->chksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_UDP,
&socket->inf->address,
&socket->out_nla);
return grub_net_send_ip_packet (socket->inf, &(socket->out_nla),
&(socket->ll_target_addr), nb,
GRUB_NET_IP_UDP);
}
grub_err_t
grub_net_recv_udp_packet (struct grub_net_buff *nb,
struct grub_net_network_level_interface *inf,
const grub_net_network_level_address_t *source)
{
struct udphdr *udph;
grub_net_udp_socket_t sock;
grub_err_t err;
/* Ignore broadcast. */
if (!inf)
{
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
udph = (struct udphdr *) nb->data;
if (nb->tail - nb->data < (grub_ssize_t) sizeof (*udph))
{
grub_dprintf ("net", "UDP packet too short: %" PRIuGRUB_SIZE "\n",
(grub_size_t) (nb->tail - nb->data));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
FOR_UDP_SOCKETS (sock)
{
if (grub_be_to_cpu16 (udph->dst) == sock->in_port
&& inf == sock->inf
&& grub_net_addr_cmp (source, &sock->out_nla) == 0
&& (sock->status == GRUB_NET_SOCKET_START
|| grub_be_to_cpu16 (udph->src) == sock->out_port))
{
if (udph->chksum)
{
grub_uint16_t chk, expected;
chk = udph->chksum;
udph->chksum = 0;
expected = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_UDP,
&sock->out_nla,
&sock->inf->address);
if (expected != chk)
{
grub_dprintf ("net", "Invalid UDP checksum. "
"Expected %x, got %x\n",
grub_be_to_cpu16 (expected),
grub_be_to_cpu16 (chk));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
udph->chksum = chk;
}
if (sock->status == GRUB_NET_SOCKET_START)
{
sock->out_port = grub_be_to_cpu16 (udph->src);
sock->status = GRUB_NET_SOCKET_ESTABLISHED;
}
err = grub_netbuff_pull (nb, sizeof (*udph));
if (err)
return err;
/* App protocol remove its own reader. */
if (sock->recv_hook)
sock->recv_hook (sock, nb, sock->recv_hook_data);
else
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
}
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
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