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 != htons(ETH_P_8021Q) || VLAN_DEV_INFO(dev)->flags & VLAN_FLAG_REORDER_HDR) { int orig_headroom = skb_headroom(skb); unsigned short veth_TCI; /* This is not a VLAN frame...but we can fix that! */ VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++; #ifdef VLAN_DEBUG printk(VLAN_DBG "%s: proto to encap: 0x%hx (hbo)\n", __FUNCTION__, htons(veth->h_vlan_proto)); #endif /* 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); skb = __vlan_put_tag(skb, veth_TCI); if (!skb) { stats->tx_dropped++; return 0; } if (orig_headroom < VLAN_HLEN) { VLAN_DEV_INFO(dev)->cnt_inc_headroom_on_tx++; } } #ifdef VLAN_DEBUG printk(VLAN_DBG "%s: about to send skb: %p to dev: %s\n", __FUNCTION__, 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 stats->tx_packets++; /* for statics only */ stats->tx_bytes += skb->len; skb->dev = VLAN_DEV_INFO(dev)->real_dev; dev_queue_xmit(skb); return 0; }
static int vlandev_seq_show(struct seq_file *seq, void *offset) { struct net_device *vlandev = (struct net_device *) seq->private; const struct vlan_dev_info *dev_info = VLAN_DEV_INFO(vlandev); struct net_device_stats *stats; static const char fmt[] = "%30s %12lu\n"; static const char fmt_bytes[] = "%30s %20llu\n"; static const char fmt_pkt[] = "%30s %16llu\n"; int i; if (!(vlandev->priv_flags & IFF_802_1Q_VLAN)) return 0; seq_printf(seq, "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", vlandev->name, dev_info->vlan_id, (int)(dev_info->flags & 1), vlandev->priv_flags); stats = vlan_dev_get_stats(vlandev); seq_printf(seq, fmt_pkt, "total frames received", stats->rx_packets); seq_printf(seq, fmt_bytes, "total bytes received", stats->rx_bytes); seq_printf(seq, fmt, "Broadcast/Multicast Rcvd", stats->multicast); seq_puts(seq, "\n"); seq_printf(seq, fmt_pkt, "total frames transmitted", stats->tx_packets); seq_printf(seq, fmt_bytes, "total bytes transmitted", stats->tx_bytes); seq_printf(seq, fmt, "total headroom inc", dev_info->cnt_inc_headroom_on_tx); seq_printf(seq, fmt, "total encap on xmit", dev_info->cnt_encap_on_xmit); seq_printf(seq, "Device: %s", dev_info->real_dev->name); /* now show all PRIORITY mappings relating to this VLAN */ seq_printf(seq, "\nINGRESS priority mappings: 0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", dev_info->ingress_priority_map[0], dev_info->ingress_priority_map[1], dev_info->ingress_priority_map[2], dev_info->ingress_priority_map[3], dev_info->ingress_priority_map[4], dev_info->ingress_priority_map[5], dev_info->ingress_priority_map[6], dev_info->ingress_priority_map[7]); seq_printf(seq, "EGRESSS priority Mappings: "); for (i = 0; i < 16; i++) { const struct vlan_priority_tci_mapping *mp = dev_info->egress_priority_map[i]; while (mp) { seq_printf(seq, "%u:%hu ", mp->priority, ((mp->vlan_qos >> 13) & 0x7)); mp = mp->next; } } seq_puts(seq, "\n"); return 0; }
int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct net_device_stats *stats = vlan_dev_get_stats(dev); struct vlan_skb_tx_cookie *cookie; stats->tx_packets++; stats->tx_bytes += skb->len; skb->dev = VLAN_DEV_INFO(dev)->real_dev; cookie = VLAN_TX_SKB_CB(skb); cookie->magic = VLAN_TX_COOKIE_MAGIC; cookie->vlan_tag = (VLAN_DEV_INFO(dev)->vlan_id | vlan_dev_get_egress_qos_mask(dev, skb)); dev_queue_xmit(skb); return 0; }
int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct net_device_stats *stats = vlan_dev_get_stats(dev); unsigned short veth_TCI; /* 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); skb = __vlan_hwaccel_put_tag(skb, veth_TCI); stats->tx_packets++; stats->tx_bytes += skb->len; skb->dev = VLAN_DEV_INFO(dev)->real_dev; dev_queue_xmit(skb); 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 "%s: skb: %p type: %hx len: %x vlan_id: %hx, daddr: %p\n", __FUNCTION__, 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 "%s: %s: had to grow skb.\n", __FUNCTION__, 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; }
/* * 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, struct net_device *orig_dev) { 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; __be16 proto; /* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */ vlan_TCI = ntohs(vhdr->h_vlan_TCI); vid = (vlan_TCI & VLAN_VID_MASK); #ifdef VLAN_DEBUG printk(VLAN_DBG "%s: skb: %p vlan_id: %hx\n", __FUNCTION__, 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. * * We must not drop allow preempt until we hold a * reference to the device (netif_rx does that) or we * fail. */ rcu_read_lock(); skb->dev = __find_vlan_dev(dev, vid); if (!skb->dev) { rcu_read_unlock(); #ifdef VLAN_DEBUG printk(VLAN_DBG "%s: ERROR: No net_device for VID: %i on dev: %s [%i]\n", __FUNCTION__, (unsigned int)(vid), dev->name, dev->ifindex); #endif kfree_skb(skb); return -1; } skb->dev->last_rx = jiffies; /* 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) */ /* Need to correct hardware checksum */ skb_postpull_rcsum(skb, vhdr, VLAN_HLEN); /* 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) { rcu_read_unlock(); #ifdef VLAN_DEBUG printk(VLAN_DBG "%s: dropping skb: %p because came in on wrong device, dev: %s real_dev: %s, skb_dev: %s\n", __FUNCTION__, 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_get_ingress_priority(skb->dev, ntohs(vhdr->h_vlan_TCI)); #ifdef VLAN_DEBUG printk(VLAN_DBG "%s: priority: %lu for TCI: %hu (hbo)\n", __FUNCTION__, (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 :-( break; 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(eth_hdr(skb)->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++; } rcu_read_unlock(); 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++; } rcu_read_unlock(); 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++; } rcu_read_unlock(); return 0; }
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)) { unsigned short veth_TCI; /* This is not a VLAN frame...but we can fix that! */ VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++; #ifdef VLAN_DEBUG printk(VLAN_DBG "%s: proto to encap: 0x%hx (hbo)\n", __FUNCTION__, 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 0; } 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 0; } } 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 "%s: about to send skb: %p to dev: %s\n", __FUNCTION__, 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 stats->tx_packets++; /* for statics only */ stats->tx_bytes += skb->len; dev_queue_xmit(skb); return 0; }