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.
This commit is contained in:
Paulo Flabiano Smorigo
Vladimir Serbinenko
parent
dc6e1b5af8
commit
d9f7de0ae3
7 changed files with 92 additions and 20 deletions
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@ -111,8 +111,8 @@ grub_net_arp_send_request (struct grub_net_network_level_interface *inf,
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}
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grub_err_t
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grub_net_arp_receive (struct grub_net_buff *nb,
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struct grub_net_card *card)
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grub_net_arp_receive (struct grub_net_buff *nb, struct grub_net_card *card,
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grub_uint16_t *vlantag)
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{
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struct arppkt *arp_packet = (struct arppkt *) nb->data;
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grub_net_network_level_address_t sender_addr, target_addr;
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@ -138,6 +138,14 @@ grub_net_arp_receive (struct grub_net_buff *nb,
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FOR_NET_NETWORK_LEVEL_INTERFACES (inf)
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{
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/* Verify vlantag id */
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if (inf->card == card && inf->vlantag != *vlantag)
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{
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grub_dprintf ("net", "invalid vlantag! %x != %x\n",
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inf->vlantag, *vlantag);
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break;
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}
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/* Am I the protocol address target? */
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if (grub_net_addr_cmp (&inf->address, &target_addr) == 0
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&& arp_packet->op == grub_cpu_to_be16_compile_time (ARP_REQUEST))
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@ -153,11 +153,11 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
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char *comma_char = 0;
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char *equal_char = 0;
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grub_size_t field_counter = 0;
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grub_net_network_level_address_t client_addr, gateway_addr, subnet_mask;
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grub_net_link_level_address_t hw_addr;
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grub_net_interface_flags_t flags = 0;
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struct grub_net_network_level_interface *inter = NULL;
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grub_uint16_t vlantag = 0;
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hw_addr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
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@ -175,6 +175,11 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
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*equal_char = 0;
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grub_env_set_net_property ((*card)->name, args, equal_char + 1,
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grub_strlen(equal_char + 1));
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if ((grub_strcmp (args, "vtag") == 0) &&
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(grub_strlen (equal_char + 1) == 8))
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vlantag = grub_strtoul (equal_char + 1 + 4, 0, 16);
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*equal_char = '=';
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}
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else
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@ -213,8 +218,10 @@ grub_ieee1275_parse_bootpath (const char *devpath, char *bootpath,
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hw_addr.mac, sizeof(hw_addr.mac), 0);
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inter = grub_net_add_addr ((*card)->name, *card, &client_addr, &hw_addr,
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flags);
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inter->vlantag = vlantag;
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grub_net_add_ipv4_local (inter,
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__builtin_ctz (~grub_le_to_cpu32 (subnet_mask.ipv4)));
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}
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if (gateway_addr.ipv4 != 0)
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@ -18,6 +18,7 @@
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/env.h>
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#include <grub/net/ethernet.h>
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#include <grub/net/ip.h>
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#include <grub/net/arp.h>
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@ -56,10 +57,17 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,
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{
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struct etherhdr *eth;
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grub_err_t err;
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grub_uint8_t etherhdr_size;
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grub_uint16_t vlantag_id = VLANTAG_IDENTIFIER;
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COMPILE_TIME_ASSERT (sizeof (*eth) < GRUB_NET_MAX_LINK_HEADER_SIZE);
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etherhdr_size = sizeof (*eth);
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COMPILE_TIME_ASSERT (sizeof (*eth) + 4 < GRUB_NET_MAX_LINK_HEADER_SIZE);
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err = grub_netbuff_push (nb, sizeof (*eth));
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/* Increase ethernet header in case of vlantag */
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if (inf->vlantag != 0)
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etherhdr_size += 4;
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err = grub_netbuff_push (nb, etherhdr_size);
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if (err)
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return err;
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eth = (struct etherhdr *) nb->data;
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@ -76,6 +84,19 @@ send_ethernet_packet (struct grub_net_network_level_interface *inf,
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return err;
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inf->card->opened = 1;
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}
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/* Check and add a vlan-tag if needed. */
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if (inf->vlantag != 0)
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{
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/* Move eth type to the right */
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grub_memcpy ((char *) nb->data + etherhdr_size - 2,
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(char *) nb->data + etherhdr_size - 6, 2);
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/* Add the tag in the middle */
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grub_memcpy ((char *) nb->data + etherhdr_size - 6, &vlantag_id, 2);
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grub_memcpy ((char *) nb->data + etherhdr_size - 4, (char *) &(inf->vlantag), 2);
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}
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return inf->card->driver->send (inf->card, nb);
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}
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@ -90,10 +111,25 @@ grub_net_recv_ethernet_packet (struct grub_net_buff *nb,
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grub_net_link_level_address_t hwaddress;
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grub_net_link_level_address_t src_hwaddress;
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grub_err_t err;
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grub_uint8_t etherhdr_size = sizeof (*eth);
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grub_uint16_t vlantag = 0;
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/* Check if a vlan-tag is present. If so, the ethernet header is 4 bytes */
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/* longer than the original one. The vlantag id is extracted and the header */
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/* is reseted to the original size. */
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if (grub_get_unaligned16 (nb->data + etherhdr_size - 2) == VLANTAG_IDENTIFIER)
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{
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vlantag = grub_get_unaligned16 (nb->data + etherhdr_size);
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etherhdr_size += 4;
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/* Move eth type to the original position */
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grub_memcpy((char *) nb->data + etherhdr_size - 6,
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(char *) nb->data + etherhdr_size - 2, 2);
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}
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eth = (struct etherhdr *) nb->data;
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type = grub_be_to_cpu16 (eth->type);
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err = grub_netbuff_pull (nb, sizeof (*eth));
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err = grub_netbuff_pull (nb, etherhdr_size);
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if (err)
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return err;
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@ -121,13 +157,14 @@ grub_net_recv_ethernet_packet (struct grub_net_buff *nb,
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{
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/* ARP packet. */
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case GRUB_NET_ETHERTYPE_ARP:
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grub_net_arp_receive (nb, card);
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grub_net_arp_receive (nb, card, &vlantag);
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grub_netbuff_free (nb);
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return GRUB_ERR_NONE;
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/* IP packet. */
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case GRUB_NET_ETHERTYPE_IP:
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case GRUB_NET_ETHERTYPE_IP6:
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return grub_net_recv_ip_packets (nb, card, &hwaddress, &src_hwaddress);
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return grub_net_recv_ip_packets (nb, card, &hwaddress, &src_hwaddress,
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&vlantag);
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}
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grub_netbuff_free (nb);
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return GRUB_ERR_NONE;
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@ -228,12 +228,13 @@ handle_dgram (struct grub_net_buff *nb,
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grub_net_ip_protocol_t proto,
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const grub_net_network_level_address_t *source,
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const grub_net_network_level_address_t *dest,
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grub_uint16_t *vlantag,
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grub_uint8_t ttl)
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{
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struct grub_net_network_level_interface *inf = NULL;
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grub_err_t err;
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int multicast = 0;
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/* DHCP needs special treatment since we don't know IP yet. */
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{
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struct udphdr *udph;
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@ -293,6 +294,15 @@ handle_dgram (struct grub_net_buff *nb,
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&& grub_net_addr_cmp (&inf->address, dest) == 0
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&& grub_net_hwaddr_cmp (&inf->hwaddress, hwaddress) == 0)
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break;
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/* Verify vlantag id */
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if (inf->card == card && inf->vlantag != *vlantag)
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{
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grub_dprintf ("net", "invalid vlantag! %x != %x\n",
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inf->vlantag, *vlantag);
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break;
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}
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/* Solicited node multicast. */
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if (inf->card == card
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&& inf->address.type == GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV6
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@ -383,7 +393,8 @@ static grub_err_t
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grub_net_recv_ip4_packets (struct grub_net_buff *nb,
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struct grub_net_card *card,
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const grub_net_link_level_address_t *hwaddress,
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const grub_net_link_level_address_t *src_hwaddress)
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const grub_net_link_level_address_t *src_hwaddress,
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grub_uint16_t *vlantag)
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{
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struct iphdr *iph = (struct iphdr *) nb->data;
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grub_err_t err;
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@ -458,7 +469,7 @@ grub_net_recv_ip4_packets (struct grub_net_buff *nb,
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dest.ipv4 = iph->dest;
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return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
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&source, &dest, iph->ttl);
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&source, &dest, vlantag, iph->ttl);
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}
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for (prev = &reassembles, rsm = *prev; rsm; prev = &rsm->next, rsm = *prev)
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@ -594,7 +605,7 @@ grub_net_recv_ip4_packets (struct grub_net_buff *nb,
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dest.ipv4 = dst;
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return handle_dgram (ret, card, src_hwaddress,
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hwaddress, proto, &source, &dest,
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hwaddress, proto, &source, &dest, vlantag,
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ttl);
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}
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}
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@ -652,7 +663,8 @@ static grub_err_t
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grub_net_recv_ip6_packets (struct grub_net_buff *nb,
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struct grub_net_card *card,
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const grub_net_link_level_address_t *hwaddress,
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const grub_net_link_level_address_t *src_hwaddress)
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const grub_net_link_level_address_t *src_hwaddress,
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grub_uint16_t *vlantag)
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{
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struct ip6hdr *iph = (struct ip6hdr *) nb->data;
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grub_err_t err;
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@ -703,21 +715,24 @@ grub_net_recv_ip6_packets (struct grub_net_buff *nb,
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grub_memcpy (dest.ipv6, &iph->dest, sizeof (dest.ipv6));
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return handle_dgram (nb, card, src_hwaddress, hwaddress, iph->protocol,
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&source, &dest, iph->ttl);
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&source, &dest, vlantag, iph->ttl);
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}
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grub_err_t
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grub_net_recv_ip_packets (struct grub_net_buff *nb,
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struct grub_net_card *card,
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const grub_net_link_level_address_t *hwaddress,
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const grub_net_link_level_address_t *src_hwaddress)
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const grub_net_link_level_address_t *src_hwaddress,
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grub_uint16_t *vlantag)
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{
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struct iphdr *iph = (struct iphdr *) nb->data;
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if ((iph->verhdrlen >> 4) == 4)
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return grub_net_recv_ip4_packets (nb, card, hwaddress, src_hwaddress);
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return grub_net_recv_ip4_packets (nb, card, hwaddress, src_hwaddress,
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vlantag);
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if ((iph->verhdrlen >> 4) == 6)
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return grub_net_recv_ip6_packets (nb, card, hwaddress, src_hwaddress);
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return grub_net_recv_ip6_packets (nb, card, hwaddress, src_hwaddress,
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vlantag);
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grub_dprintf ("net", "Bad IP version: %d\n", (iph->verhdrlen >> 4));
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grub_netbuff_free (nb);
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return GRUB_ERR_NONE;
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@ -291,6 +291,7 @@ struct grub_net_network_level_interface
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grub_net_interface_flags_t flags;
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struct grub_net_bootp_packet *dhcp_ack;
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grub_size_t dhcp_acklen;
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grub_uint16_t vlantag;
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void *data;
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};
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@ -561,4 +562,6 @@ extern char *grub_net_default_server;
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#define GRUB_NET_INTERVAL 400
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#define GRUB_NET_INTERVAL_ADDITION 20
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#define VLANTAG_IDENTIFIER 0x8100
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#endif /* ! GRUB_NET_HEADER */
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@ -22,10 +22,11 @@
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#include <grub/net.h>
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extern grub_err_t grub_net_arp_receive (struct grub_net_buff *nb,
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struct grub_net_card *card);
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struct grub_net_card *card,
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grub_uint16_t *vlantag);
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grub_err_t
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grub_net_arp_send_request (struct grub_net_network_level_interface *inf,
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const grub_net_network_level_address_t *proto_addr);
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const grub_net_network_level_address_t *proto_addr);
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#endif
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@ -48,7 +48,8 @@ grub_err_t
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grub_net_recv_ip_packets (struct grub_net_buff *nb,
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struct grub_net_card *card,
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const grub_net_link_level_address_t *hwaddress,
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const grub_net_link_level_address_t *src_hwaddress);
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const grub_net_link_level_address_t *src_hwaddress,
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grub_uint16_t *vlantag);
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grub_err_t
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grub_net_send_ip_packet (struct grub_net_network_level_interface *inf,
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