From d9f7de0ae3c0c09cff7257c55418450261f3e082 Mon Sep 17 00:00:00 2001
From: Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Date: Mon, 23 Dec 2013 12:32:02 -0200
Subject: [PATCH 013/198] Add Virtual LAN support.
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.
---
grub-core/net/arp.c | 12 +++++++--
grub-core/net/drivers/ieee1275/ofnet.c | 9 ++++++-
grub-core/net/ethernet.c | 47 ++++++++++++++++++++++++++++++----
grub-core/net/ip.c | 33 +++++++++++++++++-------
include/grub/net.h | 3 +++
include/grub/net/arp.h | 5 ++--
include/grub/net/ip.h | 3 ++-
7 files changed, 92 insertions(+), 20 deletions(-)
diff --git a/grub-core/net/arp.c b/grub-core/net/arp.c
index 4b68c4151..54306e3b1 100644
--- a/grub-core/net/arp.c
+++ b/grub-core/net/arp.c
@@ -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))
diff --git a/grub-core/net/drivers/ieee1275/ofnet.c b/grub-core/net/drivers/ieee1275/ofnet.c
index a78d164db..002446be1 100644
--- a/grub-core/net/drivers/ieee1275/ofnet.c
+++ b/grub-core/net/drivers/ieee1275/ofnet.c
@@ -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)
diff --git a/grub-core/net/ethernet.c b/grub-core/net/ethernet.c
index c397b1b34..4d7ceed6f 100644
--- a/grub-core/net/ethernet.c
+++ b/grub-core/net/ethernet.c
@@ -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;
diff --git a/grub-core/net/ip.c b/grub-core/net/ip.c
index aba4f8908..7c95cc746 100644
--- a/grub-core/net/ip.c
+++ b/grub-core/net/ip.c
@@ -228,12 +228,13 @@ 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;
grub_err_t err;
int multicast = 0;
-
+
/* DHCP needs special treatment since we don't know IP yet. */
{
struct udphdr *udph;
@@ -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;
diff --git a/include/grub/net.h b/include/grub/net.h
index 2192fa186..1096b2432 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -291,6 +291,7 @@ 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;
};
@@ -561,4 +562,6 @@ 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 */
diff --git a/include/grub/net/arp.h b/include/grub/net/arp.h
index bb1703622..8d9d08113 100644
--- a/include/grub/net/arp.h
+++ b/include/grub/net/arp.h
@@ -22,10 +22,11 @@
#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,
- const grub_net_network_level_address_t *proto_addr);
+ const grub_net_network_level_address_t *proto_addr);
#endif
diff --git a/include/grub/net/ip.h b/include/grub/net/ip.h
index dcceaa568..ab9d68f98 100644
--- a/include/grub/net/ip.h
+++ b/include/grub/net/ip.h
@@ -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,
--
2.14.3