patch-2.4.14 linux/net/8021q/vlan_dev.c
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- Lines: 780
- Date:
Tue Oct 30 15:08:12 2001
- Orig file:
v2.4.13/linux/net/8021q/vlan_dev.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.13/linux/net/8021q/vlan_dev.c linux/net/8021q/vlan_dev.c
@@ -0,0 +1,779 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * Ethernet-type device handling.
+ *
+ * Authors: Ben Greear <greearb@candelatech.com>, <greearb@agcs.com>
+ *
+ * Fixes: Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
+ * - reset skb->pkt_type on incoming packets when MAC was changed
+ * - see that changed MAC is saddr for outgoing packets
+ * Oct 20, 2001: Ard van Breeman:
+ * - Fix MC-list, finally.
+ * - Flush MC-list on VLAN destroy.
+ *
+ *
+ * This program 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
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <asm/uaccess.h> /* for copy_from_user */
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <net/datalink.h>
+#include <net/p8022.h>
+#include <net/arp.h>
+#include <linux/brlock.h>
+
+#include "vlan.h"
+#include "vlanproc.h"
+#include <linux/if_vlan.h>
+#include <net/ip.h>
+
+struct net_device_stats *vlan_dev_get_stats(struct net_device *dev)
+{
+ return &(((struct vlan_dev_info *)(dev->priv))->dev_stats);
+}
+
+
+/*
+ * Rebuild the Ethernet MAC header. This is called after an ARP
+ * (or in future other address resolution) has completed on this
+ * sk_buff. We now let ARP fill in the other fields.
+ *
+ * This routine CANNOT use cached dst->neigh!
+ * Really, it is used only when dst->neigh is wrong.
+ *
+ * TODO: This needs a checkup, I'm ignorant here. --BLG
+ */
+int vlan_dev_rebuild_header(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+ struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
+
+ switch (veth->h_vlan_encapsulated_proto) {
+#ifdef CONFIG_INET
+ case __constant_htons(ETH_P_IP):
+
+ /* TODO: Confirm this will work with VLAN headers... */
+ return arp_find(veth->h_dest, skb);
+#endif
+ default:
+ printk(VLAN_DBG
+ "%s: unable to resolve type %X addresses.\n",
+ dev->name, (int)veth->h_vlan_encapsulated_proto);
+
+ memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
+ break;
+ };
+
+ return 0;
+}
+
+/*
+ * Determine the packet's protocol ID. The rule here is that we
+ * assume 802.3 if the type field is short enough to be a length.
+ * This is normal practice and works for any 'now in use' protocol.
+ *
+ * Also, at this point we assume that we ARE dealing exclusively with
+ * VLAN packets, or packets that should be made into VLAN packets based
+ * on a default VLAN ID.
+ *
+ * NOTE: Should be similar to ethernet/eth.c.
+ *
+ * SANITY NOTE: This method is called when a packet is moving up the stack
+ * towards userland. To get here, it would have already passed
+ * through the ethernet/eth.c eth_type_trans() method.
+ * SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
+ * stored UNALIGNED in the memory. RISC systems don't like
+ * such cases very much...
+ * SANITY NOTE 2a: According to Dave Miller & Alexey, it will always be aligned,
+ * so there doesn't need to be any of the unaligned stuff. It has
+ * been commented out now... --Ben
+ *
+ */
+int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type* ptype)
+{
+ unsigned char *rawp = NULL;
+ struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data);
+ unsigned short vid;
+ struct net_device_stats *stats;
+ unsigned short vlan_TCI;
+ unsigned short proto;
+
+ /* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */
+ vlan_TCI = ntohs(vhdr->h_vlan_TCI);
+
+ vid = (vlan_TCI & 0xFFF);
+
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": skb: %p vlan_id: %hx\n",
+ skb, vid);
+#endif
+
+ /* Ok, we will find the correct VLAN device, strip the header,
+ * and then go on as usual.
+ */
+
+ /* we have 12 bits of vlan ID. */
+ /* If it's NULL, we will tag it to be junked below */
+ skb->dev = find_802_1Q_vlan_dev(dev, vid);
+
+ if (!skb->dev) {
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": ERROR: No net_device for VID: %i on dev: %s [%i]\n",
+ (unsigned int)(vid), dev->name, dev->ifindex);
+#endif
+ kfree_skb(skb);
+ return -1;
+ }
+
+ /* Bump the rx counters for the VLAN device. */
+ stats = vlan_dev_get_stats(skb->dev);
+ stats->rx_packets++;
+ stats->rx_bytes += skb->len;
+
+ skb_pull(skb, VLAN_HLEN); /* take off the VLAN header (4 bytes currently) */
+
+ /* Ok, lets check to make sure the device (dev) we
+ * came in on is what this VLAN is attached to.
+ */
+
+ if (dev != VLAN_DEV_INFO(skb->dev)->real_dev) {
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": dropping skb: %p because came in on wrong device, dev: %s real_dev: %s, skb_dev: %s\n",
+ skb, dev->name, VLAN_DEV_INFO(skb->dev)->real_dev->name, skb->dev->name);
+#endif
+ kfree_skb(skb);
+ stats->rx_errors++;
+ return -1;
+ }
+
+ /*
+ * Deal with ingress priority mapping.
+ */
+ skb->priority = VLAN_DEV_INFO(skb->dev)->ingress_priority_map[(ntohs(vhdr->h_vlan_TCI) >> 13) & 0x7];
+
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": priority: %lu for TCI: %hu (hbo)\n",
+ (unsigned long)(skb->priority), ntohs(vhdr->h_vlan_TCI));
+#endif
+
+ /* The ethernet driver already did the pkt_type calculations
+ * for us...
+ */
+ switch (skb->pkt_type) {
+ case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
+ // stats->broadcast ++; // no such counter :-(
+ case PACKET_MULTICAST:
+ stats->multicast++;
+ break;
+ case PACKET_OTHERHOST:
+ /* Our lower layer thinks this is not local, let's make sure.
+ * This allows the VLAN to have a different MAC than the underlying
+ * device, and still route correctly.
+ */
+ if (memcmp(skb->mac.ethernet->h_dest, skb->dev->dev_addr, ETH_ALEN) == 0) {
+ /* It is for our (changed) MAC-address! */
+ skb->pkt_type = PACKET_HOST;
+ }
+ break;
+ default:
+ break;
+ };
+
+ /* Was a VLAN packet, grab the encapsulated protocol, which the layer
+ * three protocols care about.
+ */
+ /* proto = get_unaligned(&vhdr->h_vlan_encapsulated_proto); */
+ proto = vhdr->h_vlan_encapsulated_proto;
+
+ skb->protocol = proto;
+ if (ntohs(proto) >= 1536) {
+ /* place it back on the queue to be handled by
+ * true layer 3 protocols.
+ */
+
+ /* See if we are configured to re-write the VLAN header
+ * to make it look like ethernet...
+ */
+ skb = vlan_check_reorder_header(skb);
+
+ /* Can be null if skb-clone fails when re-ordering */
+ if (skb) {
+ netif_rx(skb);
+ } else {
+ /* TODO: Add a more specific counter here. */
+ stats->rx_errors++;
+ }
+ return 0;
+ }
+
+ rawp = skb->data;
+
+ /*
+ * This is a magic hack to spot IPX packets. Older Novell breaks
+ * the protocol design and runs IPX over 802.3 without an 802.2 LLC
+ * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
+ * won't work for fault tolerant netware but does for the rest.
+ */
+ if (*(unsigned short *)rawp == 0xFFFF) {
+ skb->protocol = __constant_htons(ETH_P_802_3);
+ /* place it back on the queue to be handled by true layer 3 protocols.
+ */
+
+ /* See if we are configured to re-write the VLAN header
+ * to make it look like ethernet...
+ */
+ skb = vlan_check_reorder_header(skb);
+
+ /* Can be null if skb-clone fails when re-ordering */
+ if (skb) {
+ netif_rx(skb);
+ } else {
+ /* TODO: Add a more specific counter here. */
+ stats->rx_errors++;
+ }
+ return 0;
+ }
+
+ /*
+ * Real 802.2 LLC
+ */
+ skb->protocol = __constant_htons(ETH_P_802_2);
+ /* place it back on the queue to be handled by upper layer protocols.
+ */
+
+ /* See if we are configured to re-write the VLAN header
+ * to make it look like ethernet...
+ */
+ skb = vlan_check_reorder_header(skb);
+
+ /* Can be null if skb-clone fails when re-ordering */
+ if (skb) {
+ netif_rx(skb);
+ } else {
+ /* TODO: Add a more specific counter here. */
+ stats->rx_errors++;
+ }
+ return 0;
+}
+
+/*
+ * Create the VLAN header for an arbitrary protocol layer
+ *
+ * saddr=NULL means use device source address
+ * daddr=NULL means leave destination address (eg unresolved arp)
+ *
+ * This is called when the SKB is moving down the stack towards the
+ * physical devices.
+ */
+int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, void *daddr, void *saddr,
+ unsigned len)
+{
+ struct vlan_hdr *vhdr;
+ unsigned short veth_TCI = 0;
+ int rc = 0;
+ int build_vlan_header = 0;
+ struct net_device *vdev = dev; /* save this for the bottom of the method */
+
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": skb: %p type: %hx len: %x vlan_id: %hx, daddr: %p\n",
+ skb, type, len, VLAN_DEV_INFO(dev)->vlan_id, daddr);
+#endif
+
+ /* build vlan header only if re_order_header flag is NOT set. This
+ * fixes some programs that get confused when they see a VLAN device
+ * sending a frame that is VLAN encoded (the consensus is that the VLAN
+ * device should look completely like an Ethernet device when the
+ * REORDER_HEADER flag is set) The drawback to this is some extra
+ * header shuffling in the hard_start_xmit. Users can turn off this
+ * REORDER behaviour with the vconfig tool.
+ */
+ build_vlan_header = ((VLAN_DEV_INFO(dev)->flags & 1) == 0);
+
+ if (build_vlan_header) {
+ vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
+
+ /* build the four bytes that make this a VLAN header. */
+
+ /* Now, construct the second two bytes. This field looks something
+ * like:
+ * usr_priority: 3 bits (high bits)
+ * CFI 1 bit
+ * VLAN ID 12 bits (low bits)
+ *
+ */
+ veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
+ veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
+
+ vhdr->h_vlan_TCI = htons(veth_TCI);
+
+ /*
+ * Set the protocol type.
+ * For a packet of type ETH_P_802_3 we put the length in here instead.
+ * It is up to the 802.2 layer to carry protocol information.
+ */
+
+ if (type != ETH_P_802_3) {
+ vhdr->h_vlan_encapsulated_proto = htons(type);
+ } else {
+ vhdr->h_vlan_encapsulated_proto = htons(len);
+ }
+ }
+
+ /* Before delegating work to the lower layer, enter our MAC-address */
+ if (saddr == NULL)
+ saddr = dev->dev_addr;
+
+ dev = VLAN_DEV_INFO(dev)->real_dev;
+
+ /* MPLS can send us skbuffs w/out enough space. This check will grow the
+ * skb if it doesn't have enough headroom. Not a beautiful solution, so
+ * I'll tick a counter so that users can know it's happening... If they
+ * care...
+ */
+
+ /* NOTE: This may still break if the underlying device is not the final
+ * device (and thus there are more headers to add...) It should work for
+ * good-ole-ethernet though.
+ */
+ if (skb_headroom(skb) < dev->hard_header_len) {
+ struct sk_buff *sk_tmp = skb;
+ skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
+ kfree_skb(sk_tmp);
+ if (skb == NULL) {
+ struct net_device_stats *stats = vlan_dev_get_stats(vdev);
+ stats->tx_dropped++;
+ return -ENOMEM;
+ }
+ VLAN_DEV_INFO(vdev)->cnt_inc_headroom_on_tx++;
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": %s: had to grow skb.\n", vdev->name);
+#endif
+ }
+
+ if (build_vlan_header) {
+ /* Now make the underlying real hard header */
+ rc = dev->hard_header(skb, dev, ETH_P_8021Q, daddr, saddr, len + VLAN_HLEN);
+
+ if (rc > 0) {
+ rc += VLAN_HLEN;
+ } else if (rc < 0) {
+ rc -= VLAN_HLEN;
+ }
+ } else {
+ /* If here, then we'll just make a normal looking ethernet frame,
+ * but, the hard_start_xmit method will insert the tag (it has to
+ * be able to do this for bridged and other skbs that don't come
+ * down the protocol stack in an orderly manner.
+ */
+ rc = dev->hard_header(skb, dev, type, daddr, saddr, len);
+ }
+
+ return rc;
+}
+
+int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct net_device_stats *stats = vlan_dev_get_stats(dev);
+ struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
+
+ /* Handle non-VLAN frames if they are sent to us, for example by DHCP.
+ *
+ * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
+ * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
+ */
+
+ if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
+ /* This is not a VLAN frame...but we can fix that! */
+ unsigned short veth_TCI = 0;
+ VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++;
+
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": proto to encap: 0x%hx (hbo)\n",
+ htons(veth->h_vlan_proto));
+#endif
+
+ if (skb_headroom(skb) < VLAN_HLEN) {
+ struct sk_buff *sk_tmp = skb;
+ skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
+ kfree_skb(sk_tmp);
+ if (skb == NULL) {
+ stats->tx_dropped++;
+ return -ENOMEM;
+ }
+ VLAN_DEV_INFO(dev)->cnt_inc_headroom_on_tx++;
+ } else {
+ if (!(skb = skb_unshare(skb, GFP_ATOMIC))) {
+ printk(KERN_ERR "vlan: failed to unshare skbuff\n");
+ stats->tx_dropped++;
+ return -ENOMEM;
+ }
+ }
+ veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
+
+ /* Move the mac addresses to the beginning of the new header. */
+ memmove(skb->data, skb->data + VLAN_HLEN, 12);
+
+ /* first, the ethernet type */
+ /* put_unaligned(__constant_htons(ETH_P_8021Q), &veth->h_vlan_proto); */
+ veth->h_vlan_proto = __constant_htons(ETH_P_8021Q);
+
+ /* Now, construct the second two bytes. This field looks something
+ * like:
+ * usr_priority: 3 bits (high bits)
+ * CFI 1 bit
+ * VLAN ID 12 bits (low bits)
+ */
+ veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
+ veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
+
+ veth->h_vlan_TCI = htons(veth_TCI);
+ }
+
+ skb->dev = VLAN_DEV_INFO(dev)->real_dev;
+
+#ifdef VLAN_DEBUG
+ printk(VLAN_DBG __FUNCTION__ ": about to send skb: %p to dev: %s\n",
+ skb, skb->dev->name);
+ printk(VLAN_DBG " %2hx.%2hx.%2hx.%2xh.%2hx.%2hx %2hx.%2hx.%2hx.%2hx.%2hx.%2hx %4hx %4hx %4hx\n",
+ veth->h_dest[0], veth->h_dest[1], veth->h_dest[2], veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
+ veth->h_source[0], veth->h_source[1], veth->h_source[2], veth->h_source[3], veth->h_source[4], veth->h_source[5],
+ veth->h_vlan_proto, veth->h_vlan_TCI, veth->h_vlan_encapsulated_proto);
+#endif
+
+ dev_queue_xmit(skb);
+ stats->tx_packets++; /* for statics only */
+ stats->tx_bytes += skb->len;
+ return 0;
+}
+
+int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
+{
+ /* TODO: gotta make sure the underlying layer can handle it,
+ * maybe an IFF_VLAN_CAPABLE flag for devices?
+ */
+ if (VLAN_DEV_INFO(dev)->real_dev->mtu < new_mtu)
+ return -ERANGE;
+
+ dev->mtu = new_mtu;
+
+ return new_mtu;
+}
+
+int vlan_dev_open(struct net_device *dev)
+{
+ if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_UP))
+ return -ENETDOWN;
+
+ return 0;
+}
+
+int vlan_dev_stop(struct net_device *dev)
+{
+ vlan_flush_mc_list(dev);
+ return 0;
+}
+
+int vlan_dev_init(struct net_device *dev)
+{
+ /* TODO: figure this out, maybe do nothing?? */
+ return 0;
+}
+
+void vlan_dev_destruct(struct net_device *dev)
+{
+ if (dev) {
+ vlan_flush_mc_list(dev);
+ if (dev->priv) {
+ dev_put(VLAN_DEV_INFO(dev)->real_dev);
+ if (VLAN_DEV_INFO(dev)->dent) {
+ printk(KERN_ERR __FUNCTION__ ": dent is NOT NULL!\n");
+
+ /* If we ever get here, there is a serious bug
+ * that must be fixed.
+ */
+ }
+
+ kfree(dev->priv);
+
+ VLAN_FMEM_DBG("dev->priv free, addr: %p\n", dev->priv);
+ dev->priv = NULL;
+ }
+
+ kfree(dev);
+ VLAN_FMEM_DBG("net_device free, addr: %p\n", dev);
+ dev = NULL;
+ }
+}
+
+int vlan_dev_set_ingress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
+{
+ struct net_device *dev = dev_get_by_name(dev_name);
+
+ if (dev) {
+ if (dev->priv_flags & IFF_802_1Q_VLAN) {
+ /* see if a priority mapping exists.. */
+ VLAN_DEV_INFO(dev)->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
+ dev_put(dev);
+ return 0;
+ }
+
+ dev_put(dev);
+ }
+ return -EINVAL;
+}
+
+int vlan_dev_set_egress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
+{
+ struct net_device *dev = dev_get_by_name(dev_name);
+ struct vlan_priority_tci_mapping *mp = NULL;
+ struct vlan_priority_tci_mapping *np;
+
+ if (dev) {
+ if (dev->priv_flags & IFF_802_1Q_VLAN) {
+ /* See if a priority mapping exists.. */
+ mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
+ while (mp) {
+ if (mp->priority == skb_prio) {
+ mp->vlan_qos = ((vlan_prio << 13) & 0xE000);
+ dev_put(dev);
+ return 0;
+ }
+ }
+
+ /* Create a new mapping then. */
+ mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
+ np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
+ if (np) {
+ np->next = mp;
+ np->priority = skb_prio;
+ np->vlan_qos = ((vlan_prio << 13) & 0xE000);
+ VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF] = np;
+ dev_put(dev);
+ return 0;
+ } else {
+ dev_put(dev);
+ return -ENOBUFS;
+ }
+ }
+ dev_put(dev);
+ }
+ return -EINVAL;
+}
+
+/* Flags are defined in the vlan_dev_info class in include/linux/if_vlan.h file. */
+int vlan_dev_set_vlan_flag(char *dev_name, __u32 flag, short flag_val)
+{
+ struct net_device *dev = dev_get_by_name(dev_name);
+
+ if (dev) {
+ if (dev->priv_flags & IFF_802_1Q_VLAN) {
+ /* verify flag is supported */
+ if (flag == 1) {
+ if (flag_val) {
+ VLAN_DEV_INFO(dev)->flags |= 1;
+ } else {
+ VLAN_DEV_INFO(dev)->flags &= ~1;
+ }
+ dev_put(dev);
+ return 0;
+ } else {
+ printk(KERN_ERR __FUNCTION__ ": flag %i is not valid.\n",
+ (int)(flag));
+ dev_put(dev);
+ return -EINVAL;
+ }
+ } else {
+ printk(KERN_ERR __FUNCTION__
+ ": %s is not a vlan device, priv_flags: %hX.\n",
+ dev->name, dev->priv_flags);
+ dev_put(dev);
+ }
+ } else {
+ printk(KERN_ERR __FUNCTION__ ": Could not find device: %s\n", dev_name);
+ }
+
+ return -EINVAL;
+}
+
+int vlan_dev_set_mac_address(struct net_device *dev, void *addr_struct_p)
+{
+ struct sockaddr *addr = (struct sockaddr *)(addr_struct_p);
+ int i;
+
+ if (netif_running(dev))
+ return -EBUSY;
+
+ memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+ printk("%s: Setting MAC address to ", dev->name);
+ for (i = 0; i < 6; i++)
+ printk(" %2.2x", dev->dev_addr[i]);
+ printk(".\n");
+
+ if (memcmp(VLAN_DEV_INFO(dev)->real_dev->dev_addr,
+ dev->dev_addr,
+ dev->addr_len) != 0) {
+ if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_PROMISC)) {
+ int flgs = VLAN_DEV_INFO(dev)->real_dev->flags;
+
+ /* Increment our in-use promiscuity counter */
+ dev_set_promiscuity(VLAN_DEV_INFO(dev)->real_dev, 1);
+
+ /* Make PROMISC visible to the user. */
+ flgs |= IFF_PROMISC;
+ printk("VLAN (%s): Setting underlying device (%s) to promiscious mode.\n",
+ dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
+ dev_change_flags(VLAN_DEV_INFO(dev)->real_dev, flgs);
+ }
+ } else {
+ printk("VLAN (%s): Underlying device (%s) has same MAC, not checking promiscious mode.\n",
+ dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
+ }
+
+ return 0;
+}
+
+/** Taken from Gleb + Lennert's VLAN code, and modified... */
+void vlan_dev_set_multicast_list(struct net_device *vlan_dev)
+{
+ struct dev_mc_list *dmi;
+ struct net_device *real_dev;
+ int inc;
+
+ if (vlan_dev && (vlan_dev->priv_flags & IFF_802_1Q_VLAN)) {
+ /* Then it's a real vlan device, as far as we can tell.. */
+ real_dev = VLAN_DEV_INFO(vlan_dev)->real_dev;
+
+ /* compare the current promiscuity to the last promisc we had.. */
+ inc = vlan_dev->promiscuity - VLAN_DEV_INFO(vlan_dev)->old_promiscuity;
+ if (inc) {
+ printk(KERN_INFO "%s: dev_set_promiscuity(master, %d)\n",
+ vlan_dev->name, inc);
+ dev_set_promiscuity(real_dev, inc); /* found in dev.c */
+ VLAN_DEV_INFO(vlan_dev)->old_promiscuity = vlan_dev->promiscuity;
+ }
+
+ inc = vlan_dev->allmulti - VLAN_DEV_INFO(vlan_dev)->old_allmulti;
+ if (inc) {
+ printk(KERN_INFO "%s: dev_set_allmulti(master, %d)\n",
+ vlan_dev->name, inc);
+ dev_set_allmulti(real_dev, inc); /* dev.c */
+ VLAN_DEV_INFO(vlan_dev)->old_allmulti = vlan_dev->allmulti;
+ }
+
+ /* looking for addresses to add to master's list */
+ for (dmi = vlan_dev->mc_list; dmi != NULL; dmi = dmi->next) {
+ if (vlan_should_add_mc(dmi, VLAN_DEV_INFO(vlan_dev)->old_mc_list)) {
+ dev_mc_add(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+ printk(KERN_INFO "%s: add %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address to master interface\n",
+ vlan_dev->name,
+ dmi->dmi_addr[0],
+ dmi->dmi_addr[1],
+ dmi->dmi_addr[2],
+ dmi->dmi_addr[3],
+ dmi->dmi_addr[4],
+ dmi->dmi_addr[5]);
+ }
+ }
+
+ /* looking for addresses to delete from master's list */
+ for (dmi = VLAN_DEV_INFO(vlan_dev)->old_mc_list; dmi != NULL; dmi = dmi->next) {
+ if (vlan_should_add_mc(dmi, vlan_dev->mc_list)) {
+ /* if we think we should add it to the new list, then we should really
+ * delete it from the real list on the underlying device.
+ */
+ dev_mc_delete(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+ printk(KERN_INFO "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from master interface\n",
+ vlan_dev->name,
+ dmi->dmi_addr[0],
+ dmi->dmi_addr[1],
+ dmi->dmi_addr[2],
+ dmi->dmi_addr[3],
+ dmi->dmi_addr[4],
+ dmi->dmi_addr[5]);
+ }
+ }
+
+ /* save multicast list */
+ vlan_copy_mc_list(vlan_dev->mc_list, VLAN_DEV_INFO(vlan_dev));
+ }
+}
+
+/** dmi is a single entry into a dev_mc_list, a single node. mc_list is
+ * an entire list, and we'll iterate through it.
+ */
+int vlan_should_add_mc(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
+{
+ struct dev_mc_list *idmi;
+
+ for (idmi = mc_list; idmi != NULL; ) {
+ if (vlan_dmi_equals(dmi, idmi)) {
+ if (dmi->dmi_users > idmi->dmi_users)
+ return 1;
+ else
+ return 0;
+ } else {
+ idmi = idmi->next;
+ }
+ }
+
+ return 1;
+}
+
+void vlan_copy_mc_list(struct dev_mc_list *mc_list, struct vlan_dev_info *vlan_info)
+{
+ struct dev_mc_list *dmi, *new_dmi;
+
+ vlan_destroy_mc_list(vlan_info->old_mc_list);
+ vlan_info->old_mc_list = NULL;
+
+ for (dmi = mc_list; dmi != NULL; dmi = dmi->next) {
+ new_dmi = kmalloc(sizeof(*new_dmi), GFP_ATOMIC);
+ if (new_dmi == NULL) {
+ printk(KERN_ERR "vlan: cannot allocate memory. "
+ "Multicast may not work properly from now.\n");
+ return;
+ }
+
+ /* Copy whole structure, then make new 'next' pointer */
+ *new_dmi = *dmi;
+ new_dmi->next = vlan_info->old_mc_list;
+ vlan_info->old_mc_list = new_dmi;
+ }
+}
+
+void vlan_flush_mc_list(struct net_device *dev)
+{
+ struct dev_mc_list *dmi = dev->mc_list;
+
+ while (dmi) {
+ dev_mc_delete(dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+ printk(KERN_INFO "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from vlan interface\n",
+ dev->name,
+ dmi->dmi_addr[0],
+ dmi->dmi_addr[1],
+ dmi->dmi_addr[2],
+ dmi->dmi_addr[3],
+ dmi->dmi_addr[4],
+ dmi->dmi_addr[5]);
+ dmi = dev->mc_list;
+ }
+
+ /* dev->mc_list is NULL by the time we get here. */
+ vlan_destroy_mc_list(VLAN_DEV_INFO(dev)->old_mc_list);
+ VLAN_DEV_INFO(dev)->old_mc_list = NULL;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)