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grub/grub-core/net/ip.c
Sakar Arora e563928ba4 net/ip: Fix limit_time calculation in freeing old fragments 
limit_time underflows when current time is less than 90000ms.
This causes packet fragments received during this time, i.e.,
till 90000ms pass since timer init, to be rejected.

Hence, set it to 0 if its less than 90000.

Signed-off-by: Sakar Arora <Sakar.Arora@nxp.com>
2016-10-18 20:26:42 +03:00

724 lines
20 KiB
C
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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/ip.h>
#include <grub/misc.h>
#include <grub/net/arp.h>
#include <grub/net/udp.h>
#include <grub/net/ethernet.h>
#include <grub/net.h>
#include <grub/net/netbuff.h>
#include <grub/mm.h>
#include <grub/priority_queue.h>
#include <grub/time.h>
struct iphdr {
grub_uint8_t verhdrlen;
grub_uint8_t service;
grub_uint16_t len;
grub_uint16_t ident;
grub_uint16_t frags;
grub_uint8_t ttl;
grub_uint8_t protocol;
grub_uint16_t chksum;
grub_uint32_t src;
grub_uint32_t dest;
} GRUB_PACKED ;
enum
{
DONT_FRAGMENT = 0x4000,
MORE_FRAGMENTS = 0x2000,
OFFSET_MASK = 0x1fff
};
typedef grub_uint64_t ip6addr[2];
struct ip6hdr {
grub_uint32_t version_class_flow;
grub_uint16_t len;
grub_uint8_t protocol;
grub_uint8_t ttl;
ip6addr src;
ip6addr dest;
} GRUB_PACKED ;
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 iphdr *a = (struct iphdr *) a_->data;
struct iphdr *b = (struct iphdr *) b_->data;
/* We want the first elements to be on top. */
if ((grub_be_to_cpu16 (a->frags) & OFFSET_MASK)
< (grub_be_to_cpu16 (b->frags) & OFFSET_MASK))
return +1;
if ((grub_be_to_cpu16 (a->frags) & OFFSET_MASK)
> (grub_be_to_cpu16 (b->frags) & OFFSET_MASK))
return -1;
return 0;
}
struct reassemble
{
struct reassemble *next;
grub_uint32_t source;
grub_uint32_t dest;
grub_uint16_t id;
grub_uint8_t proto;
grub_uint64_t last_time;
grub_priority_queue_t pq;
struct grub_net_buff *asm_netbuff;
grub_size_t total_len;
grub_size_t cur_ptr;
grub_uint8_t ttl;
};
static struct reassemble *reassembles;
grub_uint16_t
grub_net_ip_chksum (void *ipv, grub_size_t len)
{
grub_uint16_t *ip = (grub_uint16_t *) ipv;
grub_uint32_t sum = 0;
for (; len >= 2; len -= 2)
{
sum += grub_be_to_cpu16 (grub_get_unaligned16 (ip++));
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
if (len)
{
sum += *((grub_uint8_t *) ip) << 8;
if (sum > 0xFFFF)
sum -= 0xFFFF;
}
if (sum >= 0xFFFF)
sum -= 0xFFFF;
return grub_cpu_to_be16 ((~sum) & 0x0000FFFF);
}
static int id = 0x2400;
static grub_err_t
send_fragmented (struct grub_net_network_level_interface * inf,
const grub_net_network_level_address_t * target,
struct grub_net_buff * nb,
grub_net_ip_protocol_t proto,
grub_net_link_level_address_t ll_target_addr)
{
grub_size_t off = 0;
grub_size_t fraglen;
grub_err_t err;
fraglen = (inf->card->mtu - sizeof (struct iphdr)) & ~7;
id++;
while (nb->tail - nb->data)
{
grub_size_t len = fraglen;
struct grub_net_buff *nb2;
struct iphdr *iph;
if ((grub_ssize_t) len > nb->tail - nb->data)
len = nb->tail - nb->data;
nb2 = grub_netbuff_alloc (fraglen + sizeof (struct iphdr)
+ GRUB_NET_MAX_LINK_HEADER_SIZE);
if (!nb2)
return grub_errno;
err = grub_netbuff_reserve (nb2, GRUB_NET_MAX_LINK_HEADER_SIZE);
if (err)
return err;
err = grub_netbuff_put (nb2, sizeof (struct iphdr));
if (err)
return err;
iph = (struct iphdr *) nb2->data;
iph->verhdrlen = ((4 << 4) | 5);
iph->service = 0;
iph->len = grub_cpu_to_be16 (len + sizeof (struct iphdr));
iph->ident = grub_cpu_to_be16 (id);
iph->frags = grub_cpu_to_be16 (off | (((grub_ssize_t) len
== nb->tail - nb->data)
? 0 : MORE_FRAGMENTS));
iph->ttl = 0xff;
iph->protocol = proto;
iph->src = inf->address.ipv4;
iph->dest = target->ipv4;
off += len / 8;
iph->chksum = 0;
iph->chksum = grub_net_ip_chksum ((void *) nb2->data, sizeof (*iph));
err = grub_netbuff_put (nb2, len);
if (err)
return err;
grub_memcpy (iph + 1, nb->data, len);
err = grub_netbuff_pull (nb, len);
if (err)
return err;
err = send_ethernet_packet (inf, nb2, ll_target_addr,
GRUB_NET_ETHERTYPE_IP);
if (err)
return err;
}
return GRUB_ERR_NONE;
}
static grub_err_t
grub_net_send_ip4_packet (struct grub_net_network_level_interface *inf,
const grub_net_network_level_address_t *target,
const grub_net_link_level_address_t *ll_target_addr,
struct grub_net_buff *nb,
grub_net_ip_protocol_t proto)
{
struct iphdr *iph;
grub_err_t err;
COMPILE_TIME_ASSERT (GRUB_NET_OUR_IPV4_HEADER_SIZE == sizeof (*iph));
if (nb->tail - nb->data + sizeof (struct iphdr) > inf->card->mtu)
return send_fragmented (inf, target, nb, proto, *ll_target_addr);
err = grub_netbuff_push (nb, sizeof (*iph));
if (err)
return err;
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 = proto;
iph->src = inf->address.ipv4;
iph->dest = target->ipv4;
iph->chksum = 0;
iph->chksum = grub_net_ip_chksum ((void *) nb->data, sizeof (*iph));
return send_ethernet_packet (inf, nb, *ll_target_addr,
GRUB_NET_ETHERTYPE_IP);
}
static grub_err_t
handle_dgram (struct grub_net_buff *nb,
struct grub_net_card *card,
const grub_net_link_level_address_t *source_hwaddress,
const grub_net_link_level_address_t *hwaddress,
grub_net_ip_protocol_t proto,
const grub_net_network_level_address_t *source,
const grub_net_network_level_address_t *dest,
grub_uint8_t ttl)
{
struct grub_net_network_level_interface *inf = NULL;
grub_err_t err;
int multicast = 0;
/* DHCP needs special treatment since we don't know IP yet. */
{
struct udphdr *udph;
udph = (struct udphdr *) nb->data;
if (proto == GRUB_NET_IP_UDP && grub_be_to_cpu16 (udph->dst) == 68)
{
const struct grub_net_bootp_packet *bootp;
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)
{
grub_netbuff_free (nb);
return err;
}
bootp = (const struct grub_net_bootp_packet *) nb->data;
FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
if (inf->card == card
&& inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_DHCP_RECV
&& inf->hwaddress.type == GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET
&& grub_memcmp (inf->hwaddress.mac, &bootp->mac_addr,
sizeof (inf->hwaddress.mac)) == 0)
{
grub_net_process_dhcp (nb, inf->card);
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
}
FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
{
if (inf->card == card
&& grub_net_addr_cmp (&inf->address, dest) == 0
&& grub_net_hwaddr_cmp (&inf->hwaddress, hwaddress) == 0)
break;
/* Solicited node multicast. */
if (inf->card == card
&& inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
&& dest->type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
&& dest->ipv6[0] == grub_be_to_cpu64_compile_time (0xff02ULL << 48)
&& dest->ipv6[1] == (grub_be_to_cpu64_compile_time (0x01ff000000ULL)
| (inf->address.ipv6[1]
& grub_be_to_cpu64_compile_time (0xffffff)))
&& hwaddress->type == GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET
&& hwaddress->mac[0] == 0x33 && hwaddress->mac[1] == 0x33
&& hwaddress->mac[2] == 0xff
&& hwaddress->mac[3] == ((grub_be_to_cpu64 (inf->address.ipv6[1])
>> 16) & 0xff)
&& hwaddress->mac[4] == ((grub_be_to_cpu64 (inf->address.ipv6[1])
>> 8) & 0xff)
&& hwaddress->mac[5] == ((grub_be_to_cpu64 (inf->address.ipv6[1])
>> 0) & 0xff))
{
multicast = 1;
break;
}
}
if (!inf && !(dest->type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
&& dest->ipv6[0] == grub_be_to_cpu64_compile_time (0xff02ULL
<< 48)
&& dest->ipv6[1] == grub_be_to_cpu64_compile_time (1)))
{
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
if (multicast)
inf = NULL;
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_hwaddress, source);
case GRUB_NET_IP_ICMPV6:
return grub_net_recv_icmp6_packet (nb, card, inf, source_hwaddress,
source, dest, ttl);
default:
grub_netbuff_free (nb);
break;
}
return GRUB_ERR_NONE;
}
static void
free_rsm (struct reassemble *rsm)
{
struct grub_net_buff **nb;
while ((nb = grub_priority_queue_top (rsm->pq)))
{
grub_netbuff_free (*nb);
grub_priority_queue_pop (rsm->pq);
}
grub_netbuff_free (rsm->asm_netbuff);
grub_priority_queue_destroy (rsm->pq);
grub_free (rsm);
}
static void
free_old_fragments (void)
{
struct reassemble *rsm, **prev;
grub_uint64_t limit_time = grub_get_time_ms ();
limit_time = (limit_time > 90000) ? limit_time - 90000 : 0;
for (prev = &reassembles, rsm = *prev; rsm; rsm = *prev)
if (rsm->last_time < limit_time)
{
*prev = rsm->next;
free_rsm (rsm);
}
else
{
prev = &rsm->next;
}
}
static grub_err_t
grub_net_recv_ip4_packets (struct grub_net_buff *nb,
struct grub_net_card *card,
const grub_net_link_level_address_t *hwaddress,
const grub_net_link_level_address_t *src_hwaddress)
{
struct iphdr *iph = (struct iphdr *) nb->data;
grub_err_t err;
struct reassemble *rsm, **prev;
if ((iph->verhdrlen >> 4) != 4)
{
grub_dprintf ("net", "Bad IP version: %d\n", (iph->verhdrlen >> 4));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
if ((iph->verhdrlen & 0xf) < 5)
{
grub_dprintf ("net", "IP header too short: %d\n",
(iph->verhdrlen & 0xf));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
if (nb->tail - nb->data < (grub_ssize_t) ((iph->verhdrlen & 0xf)
* sizeof (grub_uint32_t)))
{
grub_dprintf ("net", "IP packet too short: %" PRIdGRUB_SSIZE "\n",
(grub_ssize_t) (nb->tail - nb->data));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
/* Check size. */
{
grub_size_t expected_size = grub_be_to_cpu16 (iph->len);
grub_size_t actual_size = (nb->tail - nb->data);
if (actual_size > expected_size)
{
err = grub_netbuff_unput (nb, actual_size - expected_size);
if (err)
{
grub_netbuff_free (nb);
return err;
}
}
if (actual_size < expected_size)
{
grub_dprintf ("net", "Cut IP packet actual: %" PRIuGRUB_SIZE
", expected %" PRIuGRUB_SIZE "\n", actual_size,
expected_size);
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
}
/* Unfragmented packet. Good. */
if (((grub_be_to_cpu16 (iph->frags) & MORE_FRAGMENTS) == 0)
&& (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK) == 0)
{
grub_net_network_level_address_t source;
grub_net_network_level_address_t dest;
err = grub_netbuff_pull (nb, ((iph->verhdrlen & 0xf)
* sizeof (grub_uint32_t)));
if (err)
{
grub_netbuff_free (nb);
return err;
}
source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
source.ipv4 = iph->src;
dest.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
dest.ipv4 = iph->dest;
return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
&source, &dest, iph->ttl);
}
for (prev = &reassembles, rsm = *prev; rsm; prev = &rsm->next, rsm = *prev)
if (rsm->source == iph->src && rsm->dest == iph->dest
&& rsm->id == iph->ident && rsm->proto == iph->protocol)
break;
if (!rsm)
{
rsm = grub_malloc (sizeof (*rsm));
if (!rsm)
return grub_errno;
rsm->source = iph->src;
rsm->dest = iph->dest;
rsm->id = iph->ident;
rsm->proto = iph->protocol;
rsm->next = reassembles;
reassembles = rsm;
prev = &reassembles;
rsm->pq = grub_priority_queue_new (sizeof (struct grub_net_buff **), cmp);
if (!rsm->pq)
{
grub_free (rsm);
return grub_errno;
}
rsm->asm_netbuff = 0;
rsm->total_len = 0;
rsm->cur_ptr = 0;
rsm->ttl = 0xff;
}
if (rsm->ttl > iph->ttl)
rsm->ttl = iph->ttl;
rsm->last_time = grub_get_time_ms ();
free_old_fragments ();
err = grub_priority_queue_push (rsm->pq, &nb);
if (err)
return err;
if (!(grub_be_to_cpu16 (iph->frags) & MORE_FRAGMENTS))
{
rsm->total_len = (8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
+ (nb->tail - nb->data));
rsm->total_len -= ((iph->verhdrlen & 0xf) * sizeof (grub_uint32_t));
rsm->asm_netbuff = grub_netbuff_alloc (rsm->total_len);
if (!rsm->asm_netbuff)
{
*prev = rsm->next;
free_rsm (rsm);
return grub_errno;
}
}
if (!rsm->asm_netbuff)
return GRUB_ERR_NONE;
while (1)
{
struct grub_net_buff **nb_top_p, *nb_top;
grub_size_t copy;
grub_size_t res_len;
struct grub_net_buff *ret;
grub_net_ip_protocol_t proto;
grub_uint32_t src;
grub_uint32_t dst;
grub_net_network_level_address_t source;
grub_net_network_level_address_t dest;
grub_uint8_t ttl;
nb_top_p = grub_priority_queue_top (rsm->pq);
if (!nb_top_p)
return GRUB_ERR_NONE;
nb_top = *nb_top_p;
grub_priority_queue_pop (rsm->pq);
iph = (struct iphdr *) nb_top->data;
err = grub_netbuff_pull (nb_top, ((iph->verhdrlen & 0xf)
* sizeof (grub_uint32_t)));
if (err)
{
grub_netbuff_free (nb_top);
return err;
}
if (rsm->cur_ptr < (grub_size_t) 8 * (grub_be_to_cpu16 (iph->frags)
& OFFSET_MASK))
{
grub_netbuff_free (nb_top);
return GRUB_ERR_NONE;
}
rsm->cur_ptr = (8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
+ (nb_top->tail - nb_top->head));
if ((grub_size_t) 8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
>= rsm->total_len)
{
grub_netbuff_free (nb_top);
continue;
}
copy = nb_top->tail - nb_top->data;
if (rsm->total_len - 8 * (grub_be_to_cpu16 (iph->frags) & OFFSET_MASK)
< copy)
copy = rsm->total_len - 8 * (grub_be_to_cpu16 (iph->frags)
& OFFSET_MASK);
grub_memcpy (&rsm->asm_netbuff->data[8 * (grub_be_to_cpu16 (iph->frags)
& OFFSET_MASK)],
nb_top->data, copy);
if ((grub_be_to_cpu16 (iph->frags) & MORE_FRAGMENTS))
{
grub_netbuff_free (nb_top);
continue;
}
grub_netbuff_free (nb_top);
ret = rsm->asm_netbuff;
proto = rsm->proto;
src = rsm->source;
dst = rsm->dest;
ttl = rsm->ttl;
rsm->asm_netbuff = 0;
res_len = rsm->total_len;
*prev = rsm->next;
free_rsm (rsm);
if (grub_netbuff_put (ret, res_len))
{
grub_netbuff_free (ret);
return GRUB_ERR_NONE;
}
source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
source.ipv4 = src;
dest.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
dest.ipv4 = dst;
return handle_dgram (ret, card, src_hwaddress,
hwaddress, proto, &source, &dest,
ttl);
}
}
static grub_err_t
grub_net_send_ip6_packet (struct grub_net_network_level_interface *inf,
const grub_net_network_level_address_t *target,
const grub_net_link_level_address_t *ll_target_addr,
struct grub_net_buff *nb,
grub_net_ip_protocol_t proto)
{
struct ip6hdr *iph;
grub_err_t err;
COMPILE_TIME_ASSERT (GRUB_NET_OUR_IPV6_HEADER_SIZE == sizeof (*iph));
if (nb->tail - nb->data + sizeof (struct iphdr) > inf->card->mtu)
return grub_error (GRUB_ERR_NET_PACKET_TOO_BIG, "packet too big");
err = grub_netbuff_push (nb, sizeof (*iph));
if (err)
return err;
iph = (struct ip6hdr *) nb->data;
iph->version_class_flow = grub_cpu_to_be32_compile_time ((6 << 28));
iph->len = grub_cpu_to_be16 (nb->tail - nb->data - sizeof (*iph));
iph->protocol = proto;
iph->ttl = 0xff;
grub_memcpy (&iph->src, inf->address.ipv6, sizeof (iph->src));
grub_memcpy (&iph->dest, target->ipv6, sizeof (iph->dest));
return send_ethernet_packet (inf, nb, *ll_target_addr,
GRUB_NET_ETHERTYPE_IP6);
}
grub_err_t
grub_net_send_ip_packet (struct grub_net_network_level_interface *inf,
const grub_net_network_level_address_t *target,
const grub_net_link_level_address_t *ll_target_addr,
struct grub_net_buff *nb,
grub_net_ip_protocol_t proto)
{
switch (target->type)
{
case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4:
return grub_net_send_ip4_packet (inf, target, ll_target_addr, nb, proto);
case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6:
return grub_net_send_ip6_packet (inf, target, ll_target_addr, nb, proto);
default:
return grub_error (GRUB_ERR_BUG, "not an IP");
}
}
static grub_err_t
grub_net_recv_ip6_packets (struct grub_net_buff *nb,
struct grub_net_card *card,
const grub_net_link_level_address_t *hwaddress,
const grub_net_link_level_address_t *src_hwaddress)
{
struct ip6hdr *iph = (struct ip6hdr *) nb->data;
grub_err_t err;
grub_net_network_level_address_t source;
grub_net_network_level_address_t dest;
if (nb->tail - nb->data < (grub_ssize_t) sizeof (*iph))
{
grub_dprintf ("net", "IP packet too short: %" PRIdGRUB_SSIZE "\n",
(grub_ssize_t) (nb->tail - nb->data));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
err = grub_netbuff_pull (nb, sizeof (*iph));
if (err)
{
grub_netbuff_free (nb);
return err;
}
/* Check size. */
{
grub_size_t expected_size = grub_be_to_cpu16 (iph->len);
grub_size_t actual_size = (nb->tail - nb->data);
if (actual_size > expected_size)
{
err = grub_netbuff_unput (nb, actual_size - expected_size);
if (err)
{
grub_netbuff_free (nb);
return err;
}
}
if (actual_size < expected_size)
{
grub_dprintf ("net", "Cut IP packet actual: %" PRIuGRUB_SIZE
", expected %" PRIuGRUB_SIZE "\n", actual_size,
expected_size);
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
}
source.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
dest.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6;
grub_memcpy (source.ipv6, &iph->src, sizeof (source.ipv6));
grub_memcpy (dest.ipv6, &iph->dest, sizeof (dest.ipv6));
return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
&source, &dest, iph->ttl);
}
grub_err_t
grub_net_recv_ip_packets (struct grub_net_buff *nb,
struct grub_net_card *card,
const grub_net_link_level_address_t *hwaddress,
const grub_net_link_level_address_t *src_hwaddress)
{
struct iphdr *iph = (struct iphdr *) nb->data;
if ((iph->verhdrlen >> 4) == 4)
return grub_net_recv_ip4_packets (nb, card, hwaddress, src_hwaddress);
if ((iph->verhdrlen >> 4) == 6)
return grub_net_recv_ip6_packets (nb, card, hwaddress, src_hwaddress);
grub_dprintf ("net", "Bad IP version: %d\n", (iph->verhdrlen >> 4));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
}
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