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basic tcp implementation

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2011-07-10 08:46:48 +02:00
parent 92bb3cfc17
commit 3a7af37260
12 changed files with 802 additions and 27 deletions
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1
grub-core/Makefile.core.def
View file

@ -1597,6 +1597,7 @@ module = {
common = net/bootp.c;
common = net/ip.c;
common = net/udp.c;
common = net/tcp.c;
common = net/icmp.c;
common = net/ethernet.c;
common = net/arp.c;

6
grub-core/net/bootp.c
View file

@ -473,7 +473,7 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
t = 0;
}
pack->ident = grub_cpu_to_be32 (t);
pack->seconds = 0;//grub_cpu_to_be16 (t);
pack->seconds = grub_cpu_to_be16 (t);
grub_memcpy (&pack->mac_addr, &ifaces[j].hwaddress.mac, 6);
@ -484,9 +484,11 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
udph->dst = grub_cpu_to_be16 (67);
udph->chksum = 0;
udph->len = grub_cpu_to_be16 (nb->tail - nb->data);
target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
target.ipv4 = 0xffffffff;
udph->chksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_UDP,
&ifaces[j].address,
&target);
err = grub_net_send_ip_packet (&ifaces[j], &target, nb,
GRUB_NET_IP_UDP);

37
grub-core/net/ip.c
View file

@ -100,13 +100,13 @@ grub_net_ip_chksum (void *ipv, grub_size_t len)
for (; len >= 2; len -= 2)
{
sum += grub_be_to_cpu16 (*(ip++));
if (sum > 0xFFFF)
if (sum >= 0xFFFF)
sum -= 0xFFFF;
}
if (len)
{
sum += *((grub_uint8_t *) ip) << 8;
if (sum > 0xFFFF)
if (sum >= 0xFFFF)
sum -= 0xFFFF;
}
@ -229,6 +229,13 @@ handle_dgram (struct grub_net_buff *nb,
struct grub_net_network_level_interface *inf = NULL;
grub_err_t err;
grub_net_network_level_address_t source;
grub_net_network_level_address_t dest;
source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
source.ipv4 = src;
dest.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
dest.ipv4 = dst;
/* DHCP needs special treatment since we don't know IP yet. */
{
@ -241,6 +248,27 @@ handle_dgram (struct grub_net_buff *nb,
&& inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_DHCP_RECV
&& grub_net_hwaddr_cmp (&inf->hwaddress, hwaddress) == 0)
{
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,
&source,
&dest);
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;
}
err = grub_netbuff_pull (nb, sizeof (*udph));
if (err)
return err;
@ -268,13 +296,12 @@ handle_dgram (struct grub_net_buff *nb,
return GRUB_ERR_NONE;
}
source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
source.ipv4 = src;
switch (proto)
{
case GRUB_NET_IP_UDP:
return grub_net_recv_udp_packet (nb, inf, &source);
case GRUB_NET_IP_TCP:
return grub_net_recv_tcp_packet (nb, inf, &source);
case GRUB_NET_IP_ICMP:
return grub_net_recv_icmp_packet (nb, inf, &source);
default:

2
grub-core/net/net.c
View file

@ -793,6 +793,7 @@ grub_net_poll_cards (unsigned time)
while ((grub_get_time_ms () - start_time) < time)
receive_packets (card);
}
grub_net_tcp_retransmit ();
}
static void
@ -807,6 +808,7 @@ grub_net_poll_cards_idle_real (void)
|| ctime >= card->last_poll + card->idle_poll_delay_ms)
receive_packets (card);
}
grub_net_tcp_retransmit ();
}
/* Read from the packets list*/

637
grub-core/net/tcp.c Normal file
View file

@ -0,0 +1,637 @@
/*
* 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/ip.h>
#include <grub/net/tcp.h>
#include <grub/net/netbuff.h>
#include <grub/time.h>
#include <grub/priority_queue.h>
#define TCP_SYN_RETRANSMISSION_TIMEOUT 1000
#define TCP_SYN_RETRANSMISSION_COUNT 3
#define TCP_RETRANSMISSION_TIMEOUT 10000
#define TCP_RETRANSMISSION_COUNT 5
struct unacked
{
struct unacked *next;
struct grub_net_buff *nb;
grub_uint64_t last_try;
int try_count;
};
enum
{
TCP_FIN = 0x1,
TCP_SYN = 0x2,
TCP_ACK = 0x10
};
struct grub_net_tcp_socket
{
struct grub_net_tcp_socket *next;
int established;
int i_closed;
int they_closed;
int in_port;
int out_port;
int errors;
grub_uint32_t my_start_seq;
grub_uint32_t my_cur_seq;
grub_uint32_t their_start_seq;
grub_uint32_t their_cur_seq;
grub_uint16_t my_window;
struct unacked *unack_first;
struct unacked *unack_last;
grub_err_t (*recv_hook) (grub_net_tcp_socket_t sock, struct grub_net_buff *nb,
void *recv);
void (*error_hook) (grub_net_tcp_socket_t sock, void *recv);
void *hook_data;
grub_net_network_level_address_t out_nla;
struct grub_net_network_level_interface *inf;
grub_net_packets_t packs;
grub_priority_queue_t pq;
};
struct tcphdr
{
grub_uint16_t src;
grub_uint16_t dst;
grub_uint32_t seqnr;
grub_uint32_t ack;
grub_uint16_t flags;
grub_uint16_t window;
grub_uint16_t checksum;
grub_uint16_t urgent;
} __attribute__ ((packed));
struct tcp_pseudohdr
{
grub_uint32_t src;
grub_uint32_t dst;
grub_uint8_t zero;
grub_uint8_t proto;
grub_uint16_t tcp_length;
} __attribute__ ((packed));
struct grub_net_tcp_socket *tcp_sockets;
#define FOR_TCP_SOCKETS(var) for (var = tcp_sockets; var; var = var->next)
static inline void
tcp_socket_register (grub_net_tcp_socket_t sock)
{
grub_list_push (GRUB_AS_LIST_P (&tcp_sockets),
GRUB_AS_LIST (sock));
}
static grub_err_t
tcp_send (struct grub_net_buff *nb, grub_net_tcp_socket_t socket)
{
grub_err_t err;
grub_uint8_t *nbd;
struct unacked *unack;
struct tcphdr *tcph;
grub_size_t size;
tcph = (struct tcphdr *) nb->data;
tcph->seqnr = grub_cpu_to_be32 (socket->my_cur_seq);
size = (nb->tail - nb->data - (grub_be_to_cpu16 (tcph->flags) >> 12) * 4);
if (grub_be_to_cpu16 (tcph->flags) & TCP_FIN)
size++;
socket->my_cur_seq += size;
tcph->src = grub_cpu_to_be16 (socket->in_port);
tcph->dst = grub_cpu_to_be16 (socket->out_port);
tcph->checksum = 0;
tcph->checksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_TCP,
&socket->inf->address,
&socket->out_nla);
nbd = nb->data;
if (size)
{
unack = grub_malloc (sizeof (*unack));
if (!unack)
return grub_errno;
unack->next = NULL;
unack->nb = nb;
unack->try_count = 1;
unack->last_try = grub_get_time_ms ();
if (!socket->unack_last)
socket->unack_first = socket->unack_last = unack;
else
socket->unack_last->next = unack;
}
err = grub_net_send_ip_packet (socket->inf, &(socket->out_nla), nb,
GRUB_NET_IP_TCP);
if (err)
return err;
nb->data = nbd;
return GRUB_ERR_NONE;
}
void
grub_net_tcp_close (grub_net_tcp_socket_t sock)
{
struct grub_net_buff *nb_fin;
struct tcphdr *tcph_fin;
grub_err_t err;
sock->i_closed = 1;
nb_fin = grub_netbuff_alloc (sizeof (*tcph_fin) + 128);
if (!nb_fin)
return;
err = grub_netbuff_reserve (nb_fin, 128);
if (err)
{
grub_netbuff_free (nb_fin);
grub_dprintf ("net", "error closing socket\n");
grub_errno = GRUB_ERR_NONE;
return;
}
err = grub_netbuff_put (nb_fin, sizeof (*tcph_fin));
if (err)
{
grub_netbuff_free (nb_fin);
grub_dprintf ("net", "error closing socket\n");
grub_errno = GRUB_ERR_NONE;
return;
}
tcph_fin = (void *) nb_fin->data;
tcph_fin->ack = grub_cpu_to_be32 (0);
tcph_fin->flags = grub_cpu_to_be16 ((5 << 12) | TCP_FIN);
tcph_fin->window = grub_cpu_to_be16 (0);
tcph_fin->urgent = 0;
err = tcp_send (nb_fin, sock);
if (err)
{
grub_netbuff_free (nb_fin);
grub_dprintf ("net", "error closing socket\n");
grub_errno = GRUB_ERR_NONE;
}
return;
}
static void
ack (grub_net_tcp_socket_t sock)
{
struct grub_net_buff *nb_ack;
struct tcphdr *tcph_ack;
grub_err_t err;
nb_ack = grub_netbuff_alloc (sizeof (*tcph_ack) + 128);
if (!nb_ack)
return;
err = grub_netbuff_reserve (nb_ack, 128);
if (err)
{
grub_netbuff_free (nb_ack);
grub_dprintf ("net", "error closing socket\n");
grub_errno = GRUB_ERR_NONE;
return;
}
err = grub_netbuff_put (nb_ack, sizeof (*tcph_ack));
if (err)
{
grub_netbuff_free (nb_ack);
grub_dprintf ("net", "error closing socket\n");
grub_errno = GRUB_ERR_NONE;
return;
}
tcph_ack = (void *) nb_ack->data;
tcph_ack->ack = grub_cpu_to_be32 (sock->their_cur_seq);
tcph_ack->flags = grub_cpu_to_be16 ((5 << 12) | TCP_ACK);
tcph_ack->window = grub_cpu_to_be16 (sock->my_window);
tcph_ack->urgent = 0;
tcph_ack->src = grub_cpu_to_be16 (sock->in_port);
tcph_ack->dst = grub_cpu_to_be16 (sock->out_port);
err = tcp_send (nb_ack, sock);
if (err)
{
grub_dprintf ("net", "error acking socket\n");
grub_errno = GRUB_ERR_NONE;
}
}
static void
kill_socket (grub_net_tcp_socket_t sock)
{
if (sock->error_hook)
sock->error_hook (sock, sock->hook_data);
grub_net_tcp_close (sock);
}
void
grub_net_tcp_retransmit (void)
{
grub_net_tcp_socket_t sock;
grub_uint64_t ctime = grub_get_time_ms ();
grub_uint64_t limit_time = ctime - TCP_RETRANSMISSION_TIMEOUT;
FOR_TCP_SOCKETS (sock)
{
struct unacked *unack;
for (unack = sock->unack_first; unack; unack = unack->next)
{
grub_uint8_t *nbd;
grub_err_t err;
if (unack->last_try > limit_time)
continue;
if (unack->try_count > TCP_RETRANSMISSION_COUNT)
{
kill_socket (sock);
break;
}
unack->try_count++;
unack->last_try = ctime;
nbd = unack->nb->data;
err = grub_net_send_ip_packet (sock->inf, &(sock->out_nla), unack->nb,
GRUB_NET_IP_TCP);
unack->nb->data = nbd;
if (err)
{
grub_dprintf ("net", "TCP retransmit failed: %s\n", grub_errmsg);
grub_errno = GRUB_ERR_NONE;
}
}
}
}
grub_uint16_t
grub_net_ip_transport_checksum (struct grub_net_buff *nb,
grub_uint16_t proto,
const grub_net_network_level_address_t *src,
const grub_net_network_level_address_t *dst)
{
struct tcp_pseudohdr ph;
grub_uint16_t a, b;
grub_uint32_t c;
a = ~grub_be_to_cpu16 (grub_net_ip_chksum ((void *) nb->data,
nb->tail - nb->data));
ph.src = src->ipv4;
ph.dst = dst->ipv4;
ph.zero = 0;
ph.tcp_length = grub_cpu_to_be16 (nb->tail - nb->data);
ph.proto = proto;
b = ~grub_be_to_cpu16 (grub_net_ip_chksum ((void *) &ph, sizeof (ph)));
c = (grub_uint32_t) a + (grub_uint32_t) b;
if (c >= 0xffff)
c -= 0xffff;
return grub_cpu_to_be16 (~c);
}
/* FIXME: overflow. */
static int
cmp (const void *a__, const void *b__)
{
struct grub_net_buff *a_ = *(struct grub_net_buff **) a__;
struct grub_net_buff *b_ = *(struct grub_net_buff **) b__;
struct tcphdr *a = (struct tcphdr *) a_->data;
struct tcphdr *b = (struct tcphdr *) b_->data;
/* We want the first elements to be on top. */
if (grub_be_to_cpu32 (a->seqnr) < grub_be_to_cpu32 (b->seqnr))
return +1;
if (grub_be_to_cpu32 (a->seqnr) > grub_be_to_cpu32 (b->seqnr))
return -1;
return 0;
}
static void
destroy_pq (grub_net_tcp_socket_t sock)
{
struct grub_net_buff **nb_p;
while ((nb_p = grub_priority_queue_top (sock->pq)))
grub_netbuff_free (*nb_p);
grub_priority_queue_destroy (sock->pq);
}
grub_net_tcp_socket_t
grub_net_tcp_open (char *server,
grub_uint16_t out_port,
grub_err_t (*recv_hook) (grub_net_tcp_socket_t sock,
struct grub_net_buff *nb,
void *data),
void (*error_hook) (grub_net_tcp_socket_t sock,
void *data),
void *hook_data)
{
grub_err_t err;
grub_net_network_level_address_t addr;
struct grub_net_network_level_interface *inf;
grub_net_network_level_address_t gateway;
grub_net_tcp_socket_t socket;
static grub_uint16_t in_port = 21550;
struct grub_net_buff *nb;
struct tcphdr *tcph;
int i;
grub_uint8_t *nbd;
err = grub_net_resolve_address (server, &addr);
if (err)
return NULL;
if (addr.type != GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4)
{
grub_error (GRUB_ERR_BAD_ARGUMENT, "not a IPv4 address");
return NULL;
}
err = grub_net_route_address (addr, &gateway, &inf);
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->in_port = in_port++;
socket->recv_hook = recv_hook;
socket->error_hook = error_hook;
socket->hook_data = hook_data;
nb = grub_netbuff_alloc (sizeof (*tcph) + 128);
if (!nb)
return NULL;
err = grub_netbuff_reserve (nb, 128);
if (err)
{
grub_netbuff_free (nb);
return NULL;
}
err = grub_netbuff_put (nb, sizeof (*tcph));
if (err)
{
grub_netbuff_free (nb);
return NULL;
}
socket->pq = grub_priority_queue_new (sizeof (struct grub_net_buff *), cmp);
if (!socket->pq)
{
grub_netbuff_free (nb);
return NULL;
}
tcph = (void *) nb->data;
socket->my_start_seq = grub_get_time_ms ();
socket->my_cur_seq = socket->my_start_seq + 1;
socket->my_window = 8192;
tcph->seqnr = grub_cpu_to_be32 (socket->my_start_seq);
tcph->ack = grub_cpu_to_be32 (0);
tcph->flags = grub_cpu_to_be16 ((5 << 12) | TCP_SYN);
tcph->window = grub_cpu_to_be16 (socket->my_window);
tcph->urgent = 0;
tcph->src = grub_cpu_to_be16 (socket->in_port);
tcph->dst = grub_cpu_to_be16 (socket->out_port);
tcph->checksum = 0;
tcph->checksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_TCP,
&socket->inf->address,
&socket->out_nla);
tcp_socket_register (socket);
nbd = nb->data;
for (i = 0; i < TCP_SYN_RETRANSMISSION_COUNT; i++)
{
int j;
nb->data = nbd;
err = grub_net_send_ip_packet (socket->inf, &(socket->out_nla), nb,
GRUB_NET_IP_TCP);
if (err)
{
grub_list_remove (GRUB_AS_LIST_P (&tcp_sockets),
GRUB_AS_LIST (socket));
grub_free (socket);
grub_netbuff_free (nb);
return NULL;
}
for (j = 0; (j < TCP_SYN_RETRANSMISSION_TIMEOUT / 10
&& !socket->established); j++)
grub_net_poll_cards (10);
if (socket->established)
break;
}
if (!socket->established)
{
grub_list_remove (GRUB_AS_LIST_P (&tcp_sockets),
GRUB_AS_LIST (socket));
grub_free (socket);
grub_error (GRUB_ERR_NET_NO_ANSWER, "no answer");
grub_netbuff_free (nb);
destroy_pq (socket);
return NULL;
}
grub_netbuff_free (nb);
return socket;
}
grub_err_t
grub_net_send_tcp_packet (const grub_net_tcp_socket_t socket,
struct grub_net_buff *nb)
{
struct tcphdr *tcph;
grub_err_t err;
err = grub_netbuff_push (nb, sizeof (*tcph));
if (err)
return err;
tcph = (struct tcphdr *) nb->data;
tcph->ack = grub_cpu_to_be32 (0);
tcph->flags = grub_cpu_to_be16 ((5 << 12));
tcph->window = grub_cpu_to_be16 (socket->my_window);
tcph->urgent = 0;
return tcp_send (nb, socket);
}
grub_err_t
grub_net_recv_tcp_packet (struct grub_net_buff *nb,
struct grub_net_network_level_interface *inf,
const grub_net_network_level_address_t *source)
{
struct tcphdr *tcph;
grub_net_tcp_socket_t sock;
grub_err_t err;
tcph = (struct tcphdr *) nb->data;
if ((grub_be_to_cpu16 (tcph->flags) >> 12) < 5)
{
grub_dprintf ("net", "TCP header too short: %u\n",
grub_be_to_cpu16 (tcph->flags) >> 12);
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
if (nb->tail - nb->data < (grub_ssize_t) ((grub_be_to_cpu16 (tcph->flags)
>> 12) * sizeof (grub_uint32_t)))
{
grub_dprintf ("net", "TCP packet too short: %" PRIuGRUB_SIZE "\n",
nb->tail - nb->data);
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
FOR_TCP_SOCKETS (sock)
{
if (grub_be_to_cpu16 (tcph->dst) == sock->in_port
&& grub_be_to_cpu16 (tcph->src) == sock->out_port
&& inf == sock->inf
&& source->type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4
&& source->ipv4 == sock->out_nla.ipv4)
{
if (tcph->checksum)
{
grub_uint16_t chk, expected;
chk = tcph->checksum;
tcph->checksum = 0;
expected = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_TCP,
&sock->out_nla,
&sock->inf->address);
if (expected != chk)
{
grub_dprintf ("net", "Invalid TCP checksum. "
"Expected %x, got %x\n",
grub_be_to_cpu16 (expected),
grub_be_to_cpu16 (chk));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
tcph->checksum = chk;
}
if ((grub_be_to_cpu16 (tcph->flags) & TCP_SYN)
&& (grub_be_to_cpu16 (tcph->flags) & TCP_ACK)
&& !sock->established)
{
sock->their_start_seq = grub_be_to_cpu32 (tcph->seqnr);
sock->their_cur_seq = sock->their_start_seq + 1;
sock->established = 1;
}
if (grub_be_to_cpu16 (tcph->flags) & TCP_ACK)
{
struct unacked *unack, *next;
grub_uint32_t acked = grub_be_to_cpu16 (tcph->ack);
for (unack = sock->unack_first; unack; unack = next)
{
grub_uint32_t seqnr;
next = unack->next;
seqnr = grub_be_to_cpu32 (((struct tcphdr *) unack->nb->data)
->seqnr);
seqnr += (nb->tail - nb->data
- (grub_be_to_cpu16 (tcph->flags) >> 12) * 4);
if (grub_be_to_cpu16 (tcph->flags) & TCP_FIN)
seqnr++;
if (seqnr > acked)
break;
grub_netbuff_free (unack->nb);
grub_free (unack);
}
sock->unack_first = unack;
if (!sock->unack_last)
sock->unack_last = NULL;
}
if (grub_be_to_cpu32 (tcph->seqnr) < sock->their_cur_seq)
{
ack (sock);
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
err = grub_priority_queue_push (sock->pq, &nb);
if (err)
return err;
{
struct grub_net_buff **nb_top_p, *nb_top;
while (1)
{
nb_top_p = grub_priority_queue_top (sock->pq);
if (!nb_top_p)
return GRUB_ERR_NONE;
nb_top = *nb_top_p;
tcph = (struct tcphdr *) nb_top->data;
if (grub_be_to_cpu32 (tcph->seqnr) >= sock->their_cur_seq)
break;
grub_priority_queue_pop (sock->pq);
}
if (grub_be_to_cpu32 (tcph->seqnr) != sock->their_cur_seq)
return GRUB_ERR_NONE;
while (1)
{
nb_top_p = grub_priority_queue_top (sock->pq);
if (!nb_top_p)
break;
nb_top = *nb_top_p;
tcph = (struct tcphdr *) nb_top->data;
if (grub_be_to_cpu32 (tcph->seqnr) != sock->their_cur_seq)
break;
grub_priority_queue_pop (sock->pq);
err = grub_netbuff_pull (nb, (grub_be_to_cpu16 (tcph->flags)
>> 12) * sizeof (grub_uint32_t));
if (err)
return err;
sock->their_cur_seq += (nb_top->tail - nb_top->data);
if (grub_be_to_cpu16 (tcph->flags) & TCP_FIN)
{
sock->they_closed = 1;
sock->their_cur_seq++;
}
/* If there is data, puts packet in socket list. */
if ((nb_top->tail - nb_top->data) > 0)
grub_net_put_packet (&sock->packs, nb_top);
else
grub_netbuff_free (nb);
}
ack (sock);
}
while (sock->packs.first)
{
nb = sock->packs.first->nb;
if (sock->recv_hook)
sock->recv_hook (sock, sock->packs.first->nb, sock->hook_data);
grub_net_remove_packet (sock->packs.first);
}
return GRUB_ERR_NONE;
}
}
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}

19
grub-core/net/tftp.c
View file

@ -207,7 +207,6 @@ tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
return GRUB_ERR_NONE;
nb_top = *nb_top_p;
tftph = (struct tftphdr *) nb_top->data;
grub_refresh ();
if (grub_be_to_cpu16 (tftph->u.data.block) >= data->block + 1)
break;
grub_priority_queue_pop (data->pq);
@ -279,6 +278,7 @@ tftp_open (struct grub_file *file, const char *filename)
struct grub_net_buff nb;
tftp_data_t data;
grub_err_t err;
grub_uint8_t *nbd;
data = grub_zalloc (sizeof (*data));
if (!data)
@ -344,6 +344,11 @@ tftp_open (struct grub_file *file, const char *filename)
return grub_errno;
}
/* Receive OACK packet. */
nbd = nb.data;
for (i = 0; i < 3; i++)
{
nb.data = nbd;
err = grub_net_send_udp_packet (data->sock, &nb);
if (err)
{
@ -351,21 +356,9 @@ tftp_open (struct grub_file *file, const char *filename)
destroy_pq (data);
return err;
}
/* Receive OACK packet. */
for (i = 0; i < 3; i++)
{
grub_net_poll_cards (100);
if (data->have_oack)
break;
/* Retry. */
err = grub_net_send_udp_packet (data->sock, &nb);
if (err)
{
grub_net_udp_close (data->sock);
destroy_pq (data);
return err;
}
}
if (!data->have_oack)

49
grub-core/net/udp.c
View file

@ -120,10 +120,13 @@ grub_net_send_udp_packet (const grub_net_udp_socket_t socket,
udph->src = grub_cpu_to_be16 (socket->in_port);
udph->dst = grub_cpu_to_be16 (socket->out_port);
/* No chechksum. */
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), nb,
GRUB_NET_IP_UDP);
}
@ -136,26 +139,60 @@ grub_net_recv_udp_packet (struct grub_net_buff *nb,
struct udphdr *udph;
grub_net_udp_socket_t sock;
grub_err_t err;
udph = (struct udphdr *) nb->data;
err = grub_netbuff_pull (nb, sizeof (*udph));
if (err)
return err;
if (nb->tail - nb->data < (grub_ssize_t) sizeof (*udph))
{
grub_dprintf ("net", "UDP packet too short: %" PRIuGRUB_SIZE "\n",
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 && sock->recv_hook
&& inf == sock->inf
&& source->type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4
&& source->ipv4 == sock->out_nla.ipv4)
&& source->ipv4 == sock->out_nla.ipv4
&& (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;
}
}

1
include/grub/err.h
View file

@ -59,6 +59,7 @@ typedef enum
GRUB_ERR_NET_BAD_ADDRESS,
GRUB_ERR_NET_ROUTE_LOOP,
GRUB_ERR_NET_NO_ROUTE,
GRUB_ERR_NET_NO_ANSWER,
GRUB_ERR_WAIT,
GRUB_ERR_BUG
}

3
include/grub/net.h
View file

@ -415,6 +415,9 @@ grub_net_network_level_interface_unregister (struct grub_net_network_level_inter
inter->prev = 0;
}
void
grub_net_tcp_retransmit (void);
extern char *grub_net_default_server;
#endif /* ! GRUB_NET_HEADER */

10
include/grub/net/ip.h
View file

@ -50,5 +50,15 @@ 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 *src);
grub_err_t
grub_net_recv_tcp_packet (struct grub_net_buff *nb,
struct grub_net_network_level_interface *inf,
const grub_net_network_level_address_t *source);
grub_uint16_t
grub_net_ip_transport_checksum (struct grub_net_buff *nb,
grub_uint16_t proto,
const grub_net_network_level_address_t *src,
const grub_net_network_level_address_t *dst);
#endif

44
include/grub/net/tcp.h Normal file
View file

@ -0,0 +1,44 @@
/*
* 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/>.
*/
#ifndef GRUB_NET_TCP_HEADER
#define GRUB_NET_TCP_HEADER 1
#include <grub/types.h>
#include <grub/net.h>
struct grub_net_tcp_socket;
typedef struct grub_net_tcp_socket *grub_net_tcp_socket_t;
grub_net_tcp_socket_t
grub_net_tcp_open (char *server,
grub_uint16_t out_port,
grub_err_t (*recv_hook) (grub_net_tcp_socket_t sock,
struct grub_net_buff *nb,
void *data),
void (*error_hook) (grub_net_tcp_socket_t sock,
void *data),
void *hook_data);
grub_err_t
grub_net_send_tcp_packet (const grub_net_tcp_socket_t socket,
struct grub_net_buff *nb);
void
grub_net_tcp_close (grub_net_tcp_socket_t sock);
#endif

18
include/grub/net/udp.h
View file

@ -1,3 +1,21 @@
/*
* 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/>.
*/
#ifndef GRUB_NET_UDP_HEADER
#define GRUB_NET_UDP_HEADER 1
#include <grub/types.h>