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Add Virtual LAN support.

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This patch adds support for virtual LAN (VLAN) tagging. VLAN tagging allows
multiple VLANs in a bridged network to share the same physical network link
but maintain isolation:

http://en.wikipedia.org/wiki/IEEE_802.1Q

* grub-core/net/ethernet.c: Add check, get, and set vlan tag id.
* grub-core/net/drivers/ieee1275/ofnet.c: Get vlan tag id from bootargs.
* grub-core/net/arp.c: Add check.
* grub-core/net/ip.c: Likewise.
* include/grub/net/arp.h: Add vlantag attribute.
* include/grub/net/ip.h: Likewise.
This commit is contained in:
Paulo Flabiano Smorigo 2013-12-23 12:32:02 -02:00 committed by Vincent Batts
parent 99ab28563b
commit 5696d56d33
7 changed files with 92 additions and 20 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
grub-core/net/arp.c
View file

@ -111,8 +111,8 @@ grub_net_arp_send_request (struct grub_net_network_level_interface *inf,
}
grub_err_t
grub_net_arp_receive (struct grub_net_buff *nb,
struct grub_net_card *card)
grub_net_arp_receive (struct grub_net_buff *nb, struct grub_net_card *card,
grub_uint16_t *vlantag)
{
struct arppkt *arp_packet = (struct arppkt *) nb->data;
grub_net_network_level_address_t sender_addr, target_addr;
@ -138,6 +138,14 @@ grub_net_arp_receive (struct grub_net_buff *nb,
FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
{
/* Verify vlantag id */
if (inf->card == card && inf->vlantag != *vlantag)
{
grub_dprintf ("net", "invalid vlantag! %x != %x\n",
inf->vlantag, *vlantag);
break;
}
/* Am I the protocol address target? */
if (grub_net_addr_cmp (&inf->address, &target_addr) == 0
&& arp_packet->op == grub_cpu_to_be16_compile_time (ARP_REQUEST))

9
grub-core/net/drivers/ieee1275/ofnet.c
View file

@ -153,11 +153,11 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
char *comma_char = 0;
char *equal_char = 0;
grub_size_t field_counter = 0;
grub_net_network_level_address_t client_addr, gateway_addr, subnet_mask;
grub_net_link_level_address_t hw_addr;
grub_net_interface_flags_t flags = 0;
struct grub_net_network_level_interface *inter = NULL;
grub_uint16_t vlantag = 0;
hw_addr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
@ -175,6 +175,11 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
*equal_char = 0;
grub_env_set_net_property ((*card)->name, args, equal_char + 1,
grub_strlen(equal_char + 1));
if ((grub_strcmp (args, "vtag") == 0) &&
(grub_strlen (equal_char + 1) == 8))
vlantag = grub_strtoul (equal_char + 1 + 4, 0, 16);
*equal_char = '=';
}
else
@ -213,8 +218,10 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
hw_addr.mac, sizeof(hw_addr.mac), 0);
inter = grub_net_add_addr ((*card)->name, *card, &client_addr, &hw_addr,
flags);
inter->vlantag = vlantag;
grub_net_add_ipv4_local (inter,
__builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)));
}
if (gateway_addr.ipv4 != 0)

47
grub-core/net/ethernet.c
View file

@ -18,6 +18,7 @@
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/env.h>
#include <grub/net/ethernet.h>
#include <grub/net/ip.h>
#include <grub/net/arp.h>
@ -56,10 +57,17 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,
{
struct etherhdr *eth;
grub_err_t err;
grub_uint8_t etherhdr_size;
grub_uint16_t vlantag_id = VLANTAG_IDENTIFIER;
COMPILE_TIME_ASSERT (sizeof (*eth) < GRUB_NET_MAX_LINK_HEADER_SIZE);
etherhdr_size = sizeof (*eth);
COMPILE_TIME_ASSERT (sizeof (*eth) + 4 < GRUB_NET_MAX_LINK_HEADER_SIZE);
err = grub_netbuff_push (nb, sizeof (*eth));
/* Increase ethernet header in case of vlantag */
if (inf->vlantag != 0)
etherhdr_size += 4;
err = grub_netbuff_push (nb, etherhdr_size);
if (err)
return err;
eth = (struct etherhdr *) nb->data;
@ -76,6 +84,19 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,
return err;
inf->card->opened = 1;
}
/* Check and add a vlan-tag if needed. */
if (inf->vlantag != 0)
{
/* Move eth type to the right */
grub_memcpy ((char *) nb->data + etherhdr_size - 2,
(char *) nb->data + etherhdr_size - 6, 2);
/* Add the tag in the middle */
grub_memcpy ((char *) nb->data + etherhdr_size - 6, &vlantag_id, 2);
grub_memcpy ((char *) nb->data + etherhdr_size - 4, (char *) &(inf->vlantag), 2);
}
return inf->card->driver->send (inf->card, nb);
}
@ -90,10 +111,25 @@ grub_net_recv_ethernet_packet (struct grub_net_buff *nb,
grub_net_link_level_address_t hwaddress;
grub_net_link_level_address_t src_hwaddress;
grub_err_t err;
grub_uint8_t etherhdr_size = sizeof (*eth);
grub_uint16_t vlantag = 0;
/* Check if a vlan-tag is present. If so, the ethernet header is 4 bytes */
/* longer than the original one. The vlantag id is extracted and the header */
/* is reseted to the original size. */
if (grub_get_unaligned16 (nb->data + etherhdr_size - 2) == VLANTAG_IDENTIFIER)
{
vlantag = grub_get_unaligned16 (nb->data + etherhdr_size);
etherhdr_size += 4;
/* Move eth type to the original position */
grub_memcpy((char *) nb->data + etherhdr_size - 6,
(char *) nb->data + etherhdr_size - 2, 2);
}
eth = (struct etherhdr *) nb->data;
type = grub_be_to_cpu16 (eth->type);
err = grub_netbuff_pull (nb, sizeof (*eth));
err = grub_netbuff_pull (nb, etherhdr_size);
if (err)
return err;
@ -121,13 +157,14 @@ grub_net_recv_ethernet_packet (struct grub_net_buff *nb,
{
/* ARP packet. */
case GRUB_NET_ETHERTYPE_ARP:
grub_net_arp_receive (nb, card);
grub_net_arp_receive (nb, card, &vlantag);
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
/* IP packet. */
case GRUB_NET_ETHERTYPE_IP:
case GRUB_NET_ETHERTYPE_IP6:
return grub_net_recv_ip_packets (nb, card, &hwaddress, &src_hwaddress);
return grub_net_recv_ip_packets (nb, card, &hwaddress, &src_hwaddress,
&vlantag);
}
grub_netbuff_free (nb);
return GRUB_ERR_NONE;

31
grub-core/net/ip.c
View file

@ -228,6 +228,7 @@ handle_dgram (struct grub_net_buff *nb,
grub_net_ip_protocol_t proto,
const grub_net_network_level_address_t *source,
const grub_net_network_level_address_t *dest,
grub_uint16_t *vlantag,
grub_uint8_t ttl)
{
struct grub_net_network_level_interface *inf = NULL;
@ -293,6 +294,15 @@ handle_dgram (struct grub_net_buff *nb,
&& grub_net_addr_cmp (&inf->address, dest) == 0
&& grub_net_hwaddr_cmp (&inf->hwaddress, hwaddress) == 0)
break;
/* Verify vlantag id */
if (inf->card == card && inf->vlantag != *vlantag)
{
grub_dprintf ("net", "invalid vlantag! %x != %x\n",
inf->vlantag, *vlantag);
break;
}
/* Solicited node multicast. */
if (inf->card == card
&& inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
@ -383,7 +393,8 @@ 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)
const grub_net_link_level_address_t *src_hwaddress,
grub_uint16_t *vlantag)
{
struct iphdr *iph = (struct iphdr *) nb->data;
grub_err_t err;
@ -458,7 +469,7 @@ grub_net_recv_ip4_packets (struct grub_net_buff *nb,
dest.ipv4 = iph->dest;
return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
&source, &dest, iph->ttl);
&source, &dest, vlantag, iph->ttl);
}
for (prev = &reassembles, rsm = *prev; rsm; prev = &rsm->next, rsm = *prev)
@ -594,7 +605,7 @@ grub_net_recv_ip4_packets (struct grub_net_buff *nb,
dest.ipv4 = dst;
return handle_dgram (ret, card, src_hwaddress,
hwaddress, proto, &source, &dest,
hwaddress, proto, &source, &dest, vlantag,
ttl);
}
}
@ -652,7 +663,8 @@ 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)
const grub_net_link_level_address_t *src_hwaddress,
grub_uint16_t *vlantag)
{
struct ip6hdr *iph = (struct ip6hdr *) nb->data;
grub_err_t err;
@ -703,21 +715,24 @@ grub_net_recv_ip6_packets (struct grub_net_buff *nb,
grub_memcpy (dest.ipv6, &iph->dest, sizeof (dest.ipv6));
return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
&source, &dest, iph->ttl);
&source, &dest, vlantag, 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)
const grub_net_link_level_address_t *src_hwaddress,
grub_uint16_t *vlantag)
{
struct iphdr *iph = (struct iphdr *) nb->data;
if ((iph->verhdrlen >> 4) == 4)
return grub_net_recv_ip4_packets (nb, card, hwaddress, src_hwaddress);
return grub_net_recv_ip4_packets (nb, card, hwaddress, src_hwaddress,
vlantag);
if ((iph->verhdrlen >> 4) == 6)
return grub_net_recv_ip6_packets (nb, card, hwaddress, src_hwaddress);
return grub_net_recv_ip6_packets (nb, card, hwaddress, src_hwaddress,
vlantag);
grub_dprintf ("net", "Bad IP version: %d\n", (iph->verhdrlen >> 4));
grub_netbuff_free (nb);
return GRUB_ERR_NONE;

3
include/grub/net.h
View file

@ -292,6 +292,7 @@ struct grub_net_network_level_interface
grub_net_interface_flags_t flags;
struct grub_net_bootp_packet *dhcp_ack;
grub_size_t dhcp_acklen;
grub_uint16_t vlantag;
void *data;
};
@ -562,4 +563,6 @@ extern char *grub_net_default_server;
#define GRUB_NET_INTERVAL 400
#define GRUB_NET_INTERVAL_ADDITION 20
#define VLANTAG_IDENTIFIER 0x8100
#endif /* ! GRUB_NET_HEADER */

3
include/grub/net/arp.h
View file

@ -22,7 +22,8 @@
#include <grub/net.h>
extern grub_err_t grub_net_arp_receive (struct grub_net_buff *nb,
struct grub_net_card *card);
struct grub_net_card *card,
grub_uint16_t *vlantag);
grub_err_t
grub_net_arp_send_request (struct grub_net_network_level_interface *inf,

3
include/grub/net/ip.h
View file

@ -48,7 +48,8 @@ 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);
const grub_net_link_level_address_t *src_hwaddress,
grub_uint16_t *vlantag);
grub_err_t
grub_net_send_ip_packet (struct grub_net_network_level_interface *inf,