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grub2/0002-Add-Virtual-LAN-support.patch

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From d17c80ca8de35f8cb06175965d428bdabbda3c19 Mon Sep 17 00:00:00 2001
From: Paulo Flabiano Smorigo <pfsmorigo@linux.vnet.ibm.com>
Date: Mon, 30 Jun 2014 10:37:08 -0300
Subject: [PATCH 2/2] 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
---
ChangeLog | 17 ++++++++++++
grub-core/net/arp.c | 10 +++++--
grub-core/net/drivers/ieee1275/ofnet.c | 20 +++++++++++++-
grub-core/net/ethernet.c | 49 ++++++++++++++++++++++++++++++----
grub-core/net/ip.c | 31 ++++++++++++++-------
include/grub/net.h | 9 +++++++
include/grub/net/arp.h | 5 ++--
include/grub/net/ip.h | 3 ++-
8 files changed, 124 insertions(+), 20 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index a659369..188c882 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,20 @@
+2014-02-04 Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
+
+ 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.
+
2014-01-24 Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
Add bootargs parser for open firmware.
diff --git a/grub-core/net/arp.c b/grub-core/net/arp.c
index e92c7e7..3a3ee29 100644
--- a/grub-core/net/arp.c
+++ b/grub-core/net/arp.c
@@ -121,8 +121,8 @@ 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_vid)
{
struct arphdr *arp_header = (struct arphdr *) nb->data;
grub_uint8_t *sender_hardware_address;
@@ -157,6 +157,12 @@ grub_net_arp_receive (struct grub_net_buff *nb,
FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
{
+ /* Check vlantag id */
+ if (inf->card == card &&
+ ((inf->vlantag.set && vlantag_vid != inf->vlantag.vid) ||
+ (!inf->vlantag.set && vlantag_vid != 0)))
+ continue;
+
/* Am I the protocol address target? */
if (grub_net_addr_cmp (&inf->address, &target_addr) == 0
&& grub_be_to_cpu16 (arp_header->op) == ARP_REQUEST)
diff --git a/grub-core/net/drivers/ieee1275/ofnet.c b/grub-core/net/drivers/ieee1275/ofnet.c
index a079065..2a4f27c 100644
--- a/grub-core/net/drivers/ieee1275/ofnet.c
+++ b/grub-core/net/drivers/ieee1275/ofnet.c
@@ -147,11 +147,11 @@ grub_ieee1275_parse_bootargs (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;
+ grub_uint32_t vlantag = 0;
hw_addr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
@@ -169,6 +169,18 @@ grub_ieee1275_parse_bootargs (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) > 4))
+ {
+ vlantag = grub_strtoul (equal_char + 1, 0, 16) & 0xffff;
+ if (grub_errno == GRUB_ERR_BAD_NUMBER)
+ {
+ vlantag = 0;
+ grub_errno = GRUB_ERR_NONE;
+ }
+ }
+
*equal_char = '=';
}
else
@@ -207,6 +219,12 @@ grub_ieee1275_parse_bootargs (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);
+ if (vlantag > 0)
+ {
+ inter->vlantag.set = 1;
+ inter->vlantag.vid = vlantag & 0xfff;
+ }
+
grub_net_add_ipv4_local (inter,
__builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)));
}
diff --git a/grub-core/net/ethernet.c b/grub-core/net/ethernet.c
index c397b1b..3a526b3 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 +57,16 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,
{
struct etherhdr *eth;
grub_err_t err;
+ grub_uint8_t etherhdr_size;
- 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.set)
+ etherhdr_size += 4;
+
+ err = grub_netbuff_push (nb, etherhdr_size);
if (err)
return err;
eth = (struct etherhdr *) nb->data;
@@ -76,6 +83,21 @@ 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.set)
+ {
+ grub_uint32_t vlantag;
+ vlantag = grub_cpu_to_be32 ((VLANTAG_IDENTIFIER << 16) | inf->vlantag.vid);
+
+ /* 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, 4);
+ }
+
return inf->card->driver->send (inf->card, nb);
}
@@ -90,10 +112,26 @@ 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_vid = 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) ==
+ grub_cpu_to_be16_compile_time (VLANTAG_IDENTIFIER))
+ {
+ vlantag_vid = grub_be_to_cpu16 (grub_get_unaligned16 (nb->data +
+ etherhdr_size)) & 0x1fff;
+ 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 +159,14 @@ 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_vid);
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_vid);
}
grub_netbuff_free (nb);
return GRUB_ERR_NONE;
diff --git a/grub-core/net/ip.c b/grub-core/net/ip.c
index c6971f9..8041905 100644
--- a/grub-core/net/ip.c
+++ b/grub-core/net/ip.c
@@ -225,12 +225,13 @@ 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_vid,
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;
@@ -290,6 +291,13 @@ handle_dgram (struct grub_net_buff *nb,
&& grub_net_addr_cmp (&inf->address, dest) == 0
&& grub_net_hwaddr_cmp (&inf->hwaddress, hwaddress) == 0)
break;
+
+ /* Check vlantag id */
+ if (inf->card == card &&
+ ((inf->vlantag.set && vlantag_vid != inf->vlantag.vid) ||
+ (!inf->vlantag.set && vlantag_vid != 0)))
+ continue;
+
/* Solicited node multicast. */
if (inf->card == card
&& inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
@@ -378,7 +386,8 @@ 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_vid)
{
struct iphdr *iph = (struct iphdr *) nb->data;
grub_err_t err;
@@ -453,7 +462,7 @@ 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_vid, iph->ttl);
}
for (prev = &reassembles, rsm = *prev; rsm; prev = &rsm->next, rsm = *prev)
@@ -589,7 +598,7 @@ 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_vid,
ttl);
}
}
@@ -644,7 +653,8 @@ 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_vid)
{
struct ip6hdr *iph = (struct ip6hdr *) nb->data;
grub_err_t err;
@@ -695,21 +705,24 @@ 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_vid, 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_vid)
{
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_vid);
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_vid);
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 843f74f..db5f6b3 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -268,6 +268,12 @@ typedef struct grub_net
extern grub_net_t (*EXPORT_VAR (grub_net_open)) (const char *name);
+struct grub_net_vlantag
+{
+ grub_uint8_t set;
+ grub_uint16_t vid;
+};
+
struct grub_net_network_level_interface
{
struct grub_net_network_level_interface *next;
@@ -279,6 +285,7 @@ struct grub_net_network_level_interface
grub_net_interface_flags_t flags;
struct grub_net_bootp_packet *dhcp_ack;
grub_size_t dhcp_acklen;
+ struct grub_net_vlantag vlantag;
void *data;
};
@@ -537,4 +544,6 @@ extern char *grub_net_default_server;
#define GRUB_NET_TRIES 40
#define GRUB_NET_INTERVAL 400
+#define VLANTAG_IDENTIFIER 0x8100
+
#endif /* ! GRUB_NET_HEADER */
diff --git a/include/grub/net/arp.h b/include/grub/net/arp.h
index bb17036..56336b3 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_vid);
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 7a8e614..e79dec9 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_vid);
grub_err_t
grub_net_send_ip_packet (struct grub_net_network_level_interface *inf,
--
1.9.3
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