/* ********************************************************** * Copyright 1998 VMware, Inc. All rights reserved. -- VMware Confidential * **********************************************************/ #include "driver-config.h" #define EXPORT_SYMTAB #include #include #include #ifdef KERNEL_2_2 # include #else # include #endif #include #include #include #include #include "compat_skbuff.h" #include #include "compat_sock.h" #define __KERNEL_SYSCALLS__ #include #include #include #include #include #include #ifdef defined CONFIG_NET_RADIO || defined CONFIG_WLAN_80211 # include #endif #include "vmnetInt.h" #include "compat_spinlock.h" #include "compat_netdevice.h" #include "vnetInt.h" #include "smac.h" #define VNET_BRIDGE_HISTORY 48 /* * Bytes reserved before start of packet. As Ethernet header has 14 bytes, * to get aligned IP header we must skip 2 bytes before packet. Not that it * matters a lot for us, but using 2 is compatible with what newer 2.6.x * kernels do. */ #ifndef NET_IP_ALIGN #define NET_IP_ALIGN 2 #endif #if LOGLEVEL >= 4 static struct timeval vnetTime; #endif typedef struct VNetBridge VNetBridge; struct VNetBridge { struct notifier_block notifier; // for device state changes char name[VNET_NAME_LEN]; // name of net device (e.g., "eth0") struct net_device *dev; // device structure for 'name' struct sock *sk; // socket associated with skb's struct packet_type pt; // used to add packet handler Bool enabledPromisc; // track if promisc enabled Bool warnPromisc; // tracks if warning has been logged struct sk_buff *history[VNET_BRIDGE_HISTORY]; // avoid duplicate packets spinlock_t historyLock; // protects 'history' VNetPort port; // connection to virtual hub Bool wirelessAdapter; // connected to wireless adapter? struct SMACState *smac; // device structure for wireless #ifdef VMW_NETDEV_HAS_NET struct net_device *internalDev; #endif }; typedef PacketStatus (* SMACINT SMACFunc)(struct SMACState *, SMACPackets *); static int VNetBridgeUp(VNetBridge *bridge, Bool rtnlLock); static void VNetBridgeDown(VNetBridge *bridge, Bool rtnlLock); static int VNetBridgeNotify(struct notifier_block *this, u_long msg, void *data); #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14) && \ !defined(VMW_TL10S64_WORKAROUND) static int VNetBridgeReceiveFromDev(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt); #else static int VNetBridgeReceiveFromDev(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *real_dev); #endif static void VNetBridgeFree(VNetJack *this); static void VNetBridgeReceiveFromVNet(VNetJack *this, struct sk_buff *skb); static Bool VNetBridgeCycleDetect(VNetJack *this, int generation); static Bool VNetBridgeIsDeviceWireless(struct net_device *dev); static void VNetBridgePortsChanged(VNetJack *this); static int VNetBridgeIsBridged(VNetJack *this); static int VNetBridgeProcRead(char *page, char **start, off_t off, int count, int *eof, void *data); /* *---------------------------------------------------------------------- * * VNetBridgeStartPromisc -- * * Set IFF_PROMISC on the peer interface. * * Results: * None. * * Side effects: * The peer interface IFF_PROMISC flag may be changed. * *---------------------------------------------------------------------- */ static void VNetBridgeStartPromisc(VNetBridge *bridge, // IN: Bool rtnlLock) // IN: Acquire RTNL lock { struct net_device *dev = bridge->dev; /* * Disable wireless cards from going into promiscous mode because those * cards which do support RF monitoring would not be able to function * correctly i.e. they would not be able to send data packets. */ if (rtnlLock) { rtnl_lock(); } if (!bridge->enabledPromisc && !bridge->wirelessAdapter) { dev_set_promiscuity(dev, 1); bridge->enabledPromisc = TRUE; bridge->warnPromisc = FALSE; LOG(0, (KERN_NOTICE "bridge-%s: enabled promiscuous mode\n", bridge->name)); } if (rtnlLock) { rtnl_unlock(); } } /* *---------------------------------------------------------------------- * * VNetBridgeStopPromisc -- * * Restore saved IFF_PROMISC on the peer interface. * * Results: * None. * * Side effects: * The peer interface IFF_PROMISC flag may be changed. * *---------------------------------------------------------------------- */ static void VNetBridgeStopPromisc(VNetBridge *bridge, // IN: Bool rtnlLock) // IN: Acquire RTNL lock { struct net_device *dev = bridge->dev; if (rtnlLock) { rtnl_lock(); } if (bridge->enabledPromisc && !bridge->wirelessAdapter) { dev_set_promiscuity(dev, -1); bridge->enabledPromisc = FALSE; LOG(0, (KERN_NOTICE "bridge-%s: disabled promiscuous mode\n", bridge->name)); } if (rtnlLock) { rtnl_unlock(); } } /* *---------------------------------------------------------------------- * * VNetBridgeCheckPromisc -- * * Make sure IFF_PROMISC on the peer interface is set. * * This can be called periodically. * * Results: * None. * * Side effects: * Hopefully enables promiscuous mode again if it should have been enabled. * *---------------------------------------------------------------------- */ static INLINE_SINGLE_CALLER void VNetBridgeCheckPromisc(VNetBridge *bridge) { #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) if (bridge->enabledPromisc && !bridge->wirelessAdapter) { struct net_device *dev = bridge->dev; Bool devPromisc = (dev->flags & IFF_PROMISC) != 0; if (!devPromisc) { if (!bridge->warnPromisc) { bridge->warnPromisc = TRUE; LOG(0, (KERN_NOTICE "bridge-%s: someone disabled promiscuous mode\n" "Your Ethernet driver is not compatible with VMware's bridged networking.\n", bridge->name)); } rtnl_lock(); dev_set_promiscuity(dev, 0); rtnl_unlock(); } } #endif } #ifdef VMW_NETDEV_HAS_NET /* *---------------------------------------------------------------------- * * VNetBridgeInternalSetup -- * * Setup callback for our bridge internal device. Nothing to do, * generic code sets up everything we expect from device. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ static void VNetBridgeInternalSetup(struct net_device *net) { /* Do nothing. */ } #endif /* *---------------------------------------------------------------------- * * VNetBridgeDevCompatible -- * * Check whether bridge and network device are compatible. * * Results: * Non-zero if device is good enough for bridge. Zero otherwise. * * Side effects: * None. * *---------------------------------------------------------------------- */ static INLINE_SINGLE_CALLER int VNetBridgeDevCompatible(VNetBridge *bridge, // IN: Bridge struct net_device *net) // IN: Network device { #ifdef VMW_NETDEV_HAS_NET if (net->nd_net != bridge->internalDev->nd_net) { return 0; } #endif return strcmp(net->name, bridge->name) == 0; } /* *---------------------------------------------------------------------- * * VNetBridge_Create -- * * Create a bridge. Allocates/initializes struct, registers * with kernel for device state changes, connects to virtual * hub, initializes port/jack, and creates a proc entry. * * Results: * Errno. Also returns an allocated jack to connect to, * NULL on error. * * Side effects: * None. * *---------------------------------------------------------------------- */ int VNetBridge_Create(const char *devName, // IN: name of device (e.g., "eth0") VNetPort **ret) // OUT: port to virtual hub { VNetBridge *bridge = NULL; static unsigned id = 0; int retval = 0; *ret = NULL; /* * Its an error if device name is empty. */ if (devName[0] == '\0') { retval = -EINVAL; goto out; } /* * Allocate bridge structure */ bridge = kmalloc(sizeof *bridge, GFP_USER); if (bridge == NULL) { retval = -ENOMEM; goto out; } memset(bridge, 0, sizeof *bridge); spin_lock_init(&bridge->historyLock); memcpy(bridge->name, devName, sizeof bridge->name); NULL_TERMINATE_STRING(bridge->name); #ifdef VMW_NETDEV_HAS_NET bridge->internalDev = compat_alloc_netdev(0, "vmnetX", VNetBridgeInternalSetup); if (!bridge->internalDev) { retval = -ENOMEM; goto out; } #endif /* * Set up notifier for network device state change */ bridge->notifier.notifier_call = VNetBridgeNotify; bridge->notifier.priority = 0; register_netdevice_notifier(&bridge->notifier); /* * Try to bring it up */ retval = VNetBridgeUp(bridge, TRUE); if (retval == -ENODEV) { LOG(1, (KERN_DEBUG "bridge-%s: peer interface %s not found, " "will wait for it to come up\n", bridge->name, devName)); retval = 0; } if (retval != 0) { goto out; } /* * Initialize jack */ bridge->port.id = id++; bridge->port.next = NULL; bridge->port.jack.peer = NULL; bridge->port.jack.numPorts = 1; VNetSnprintf(bridge->port.jack.name, sizeof bridge->port.jack.name, "bridge%u", bridge->port.id); bridge->port.jack.private = bridge; bridge->port.jack.index = 0; bridge->port.jack.procEntry = NULL; bridge->port.jack.free = VNetBridgeFree; bridge->port.jack.rcv = VNetBridgeReceiveFromVNet; bridge->port.jack.cycleDetect = VNetBridgeCycleDetect; bridge->port.jack.portsChanged = VNetBridgePortsChanged; bridge->port.jack.isBridged = VNetBridgeIsBridged; /* * Make proc entry for this jack. */ retval = VNetProc_MakeEntry(NULL, bridge->port.jack.name, S_IFREG, &bridge->port.jack.procEntry); if (retval) { if (retval == -ENXIO) { bridge->port.jack.procEntry = NULL; } else { goto out; } } else { bridge->port.jack.procEntry->read_proc = VNetBridgeProcRead; bridge->port.jack.procEntry->data = bridge; } /* * Rest of fields. */ bridge->port.flags = IFF_RUNNING; memset(bridge->port.paddr, 0, sizeof bridge->port.paddr); memset(bridge->port.ladrf, 0, sizeof bridge->port.ladrf); bridge->port.paddr[0] = VMX86_STATIC_OUI0; bridge->port.paddr[1] = VMX86_STATIC_OUI1; bridge->port.paddr[2] = VMX86_STATIC_OUI2; bridge->port.fileOpRead = NULL; bridge->port.fileOpWrite = NULL; bridge->port.fileOpIoctl = NULL; bridge->port.fileOpPoll = NULL; *ret = &bridge->port; LOG(1, (KERN_DEBUG "bridge-%s: attached\n", bridge->name)); return 0; out: if (bridge != NULL) { if (bridge->notifier.notifier_call != NULL) { unregister_netdevice_notifier(&bridge->notifier); } #ifdef VMW_NETDEV_HAS_NET if (bridge->internalDev) { compat_free_netdev(bridge->internalDev); } #endif kfree(bridge); } return retval; } /* *---------------------------------------------------------------------- * * VNetBridgeFree -- * * Disconnect the bridge, unregister from device state * notifications, remove proc entry, and deallocate struct. * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void VNetBridgeFree(VNetJack *this) // IN: jack to free { VNetBridge *bridge = (VNetBridge*)this->private; if (bridge->dev != NULL) { VNetBridgeDown(bridge, TRUE); } unregister_netdevice_notifier(&bridge->notifier); #ifdef VMW_NETDEV_HAS_NET if (bridge->internalDev) { compat_free_netdev(bridge->internalDev); } #endif if (this->procEntry) { VNetProc_RemoveEntry(this->procEntry, NULL); } if (bridge->smac){ SMAC_CleanupState(&(bridge->smac)); } LOG(1, (KERN_DEBUG "bridge-%s: detached\n", bridge->name)); kfree(bridge); } /* *---------------------------------------------------------------------- * * VNetCallSMACFunc -- * * Wrapper for SMAC functions. * * Results: * Packet Status. * * Side effects: * The skb buffer is freed if not succesfull otherwise it points to * the clone. * *---------------------------------------------------------------------- */ PacketStatus VNetCallSMACFunc(struct SMACState *state, // IN: pointer to state struct sk_buff **skb, // IN/OUT: packet to process void *startOfData, // IN: points to start of data SMACFunc func) // IN: function to be called { SMACPackets packets = { {0} }; PacketStatus status; packets.orig.skb = *skb; packets.orig.startOfData = startOfData; status = func(state, &packets); if (status != PacketStatusForwardPacket) { dev_kfree_skb(*skb); return status; } if (packets.clone.skb) { dev_kfree_skb(*skb); *skb = packets.clone.skb; } return status; } /* *---------------------------------------------------------------------- * * VNetBridgeReceiveFromVNet -- * * This jack is receiving a packet from a vnet. This function * sends down (i.e., out on the host net device) if the packet * isn't destined for the host, and it sends up (i.e., * simulates a receive for the host) if the packet * satisfies the host's packet filter. * * When the function sends up it keeps a reference to the * packet in a history list so that we can avoid handing * a VM a copy of its own packet. * * Results: * None. * * Side effects: * Frees skb. Checks if host device is still using * promiscuous mode. * *---------------------------------------------------------------------- */ void VNetBridgeReceiveFromVNet(VNetJack *this, // IN: jack struct sk_buff *skb) // IN: pkt to receive { VNetBridge *bridge = (VNetBridge*)this->private; struct net_device *dev = bridge->dev; uint8 dest[ETH_ALEN]; struct sk_buff *clone; LOG(3, (KERN_DEBUG "bridge-%s: transmit %d\n", bridge->name, (int) skb->len)); if (!dev) { dev_kfree_skb(skb); return; } /* * skb might be freed by wireless code, so need to keep * a local copy of the MAC rather than a pointer to it. */ memcpy(dest, SKB_2_DESTMAC(skb), ETH_ALEN); /* * Check promiscuous bit periodically */ VNetBridgeCheckPromisc(bridge); #ifdef notdef // xxx; /* * We need to send the packet both up to the host and down * to the interface. * However, we ignore packets destined only for this hub. */ for (i = 0; i < VNET_PORTS_PER_HUB; i++) { VNetPort *p = &port->hub->port[i]; if (UP_AND_RUNNING(p->flags) && MAC_EQ(dest, p->paddr)) { return; } } #endif /* * Wireless processing */ if (bridge->smac) { if (VNetCallSMACFunc(bridge->smac, &skb, skb->data, SMAC_CheckPacketToHost) != PacketStatusForwardPacket) { LOG(4, (KERN_NOTICE "bridge-%s: packet dropped .\n", bridge->name)); return; } } /* * Send down (imitate packet_sendmsg) * * Do this only if the packet is not addressed to the peer, * and the packet size is not too big. */ dev_lock_list(); if (MAC_EQ(dest, dev->dev_addr) || skb->len > dev->mtu + dev->hard_header_len + 4) { dev_unlock_list(); } else { # if 0 // XXX we should do header translation if ((dev->flags & IFF_SOFTHEADERS) != 0) { if (skb->len > dev->mtu) { clone = NULL; } else { clone = dev_alloc_skb(skb->len + dev->hard_header_len, GFP_ATOMIC); } if (clone != NULL) { skb_reserve(clone, dev->hard_header_len); if (dev->hard_header != NULL) { dev->hard_header(clone, dev, ETH_P_IP, NULL, NULL, skb->len); } memcpy(skb_put(clone, skb->len), skb->data, skb->len); } } # endif clone = skb_clone(skb, GFP_ATOMIC); if (clone == NULL) { dev_unlock_list(); } else { struct sock *sk = bridge->sk; atomic_add(skb->truesize, &sk->sk_wmem_alloc); clone->sk = sk; clone->protocol = ((struct ethhdr *)skb->data)->h_proto; // XXX if ((dev->flags & IFF_UP) != 0) { dev_unlock_list(); DEV_QUEUE_XMIT(clone, dev, 0); } else { dev_unlock_list(); dev_kfree_skb(clone); } } } /* * Send up (imitate Ethernet receive) * * Do this if the packet is addressed to the peer (or is broadcast, etc.). * * This packet will get back to us, via VNetBridgeReceive. * We save it so we can recognize it (and its clones) again. */ if (VNetPacketMatch(dest, dev->dev_addr, allMultiFilter, dev->flags)) { clone = skb_clone(skb, GFP_ATOMIC); if (clone) { unsigned long flags; int i; atomic_inc(&clone->users); clone->dev = dev; clone->protocol = eth_type_trans(clone, dev); spin_lock_irqsave(&bridge->historyLock, flags); for (i = 0; i < VNET_BRIDGE_HISTORY; i++) { if (bridge->history[i] == NULL) { bridge->history[i] = clone; # if LOGLEVEL >= 3 { int j; int count = 0; for (j = 0; j < VNET_BRIDGE_HISTORY; j++) { if (bridge->history[j] != NULL) { count++; } } LOG(3, (KERN_DEBUG "bridge-%s: host slot %d history %d\n", bridge->name, i, count)); } # endif break; } } if (i >= VNET_BRIDGE_HISTORY) { LOG(1, (KERN_NOTICE "bridge-%s: history full\n", bridge->name)); for (i = 0; i < VNET_BRIDGE_HISTORY; i++) { struct sk_buff *s = bridge->history[i]; /* * We special case 0 to avoid races with another thread on * another cpu wanting to use the 0 entry. This could happen * when we release the lock to free the former entry. * See bug 11231 for details. */ if (i == 0) { bridge->history[0] = clone; } else { bridge->history[i] = NULL; } if (s) { spin_unlock_irqrestore(&bridge->historyLock, flags); dev_kfree_skb(s); spin_lock_irqsave(&bridge->historyLock, flags); } } } spin_unlock_irqrestore(&bridge->historyLock, flags); /* * We used to cli() before calling netif_rx() here. It was probably * unneeded (as we never did it in netif.c, and the code worked). In * any case, now that we are using netif_rx_ni(), we should certainly * not do it, or netif_rx_ni() will deadlock on the cli() lock --hpreg */ netif_rx_ni(clone); # if LOGLEVEL >= 4 do_gettimeofday(&vnetTime); # endif } } // xxx; dev_kfree_skb(skb); } /* *---------------------------------------------------------------------- * * VNetBridgeCycleDetect -- * * Cycle detection algorithm. * * Results: * TRUE if a cycle was detected, FALSE otherwise. * * Side effects: * None. * *---------------------------------------------------------------------- */ Bool VNetBridgeCycleDetect(VNetJack *this, // IN: jack int generation) // IN: generation { VNetBridge *bridge = (VNetBridge*)this->private; return VNetCycleDetectIf(bridge->name, generation); } /* *---------------------------------------------------------------------- * * VNetBridgePortsChanged -- * * The number of ports connected to this jack has change, react * accordingly by starting/stopping promiscuous mode based on * whether any peers exist. * * Results: * None. * * Side effects: * Promiscuous mode may be started or stopped. * *---------------------------------------------------------------------- */ void VNetBridgePortsChanged(VNetJack *this) // IN: jack { VNetBridge *bridge = (VNetBridge*)this->private; if (bridge->dev) { if (VNetGetAttachedPorts(this)) { VNetBridgeStartPromisc(bridge, TRUE); } else { VNetBridgeStopPromisc(bridge, TRUE); } } } /* *---------------------------------------------------------------------- * * VNetBridgeIsBridged -- * * Reports if the bridged interface is up or down. * * Results: * 1 - we are bridged but the interface is not up * 2 - we are bridged and the interface is up * * Side effects: * None. * *---------------------------------------------------------------------- */ int VNetBridgeIsBridged(VNetJack *this) // IN: jack { VNetBridge *bridge = (VNetBridge*)this->private; if (bridge->dev) { return 2; } else { return 1; } } /* *---------------------------------------------------------------------- * * VNetBridgeIsDeviceWireless -- * * Check if the device is a wireless adapter, depending on the version * of the wireless extension present in the kernel. * * Results: * TRUE if the device is wireless, FALSE otherwise. * * Side effects: * None. * *---------------------------------------------------------------------- */ static Bool VNetBridgeIsDeviceWireless(struct net_device *dev) //IN: sock { #ifdef CONFIG_WIRELESS_EXT return dev->wireless_handlers != NULL; #elif !defined CONFIG_NET_RADIO && !defined CONFIG_WLAN_80211 return FALSE; #elif WIRELESS_EXT > 19 return dev->wireless_handlers != NULL; #elif WIRELESS_EXT > 12 return dev->wireless_handlers != NULL || dev->get_wireless_stats != NULL; #else return dev->get_wireless_stats != NULL; #endif } /* *---------------------------------------------------------------------- * * VNetBridgeUp -- * * Bring a bridge up. Gets peer's device structure, verifies * that interface is up, checks the header length, * allocates a socket, adds a packet handler to the network * stack, and then places the peer's device in promiscuous * mode. * * Results: * errno. * * Side effects: * Bridging may be brought up with a peer interface. * *---------------------------------------------------------------------- */ int VNetBridgeUp(VNetBridge *bridge, // IN: bridge struct Bool rtnlLock) // IN: acquire RTNL lock { int retval = 0; if (bridge->dev != NULL) { LOG(0, (KERN_NOTICE "bridge-%s: already up\n", bridge->name)); goto out; } /* * Get peer device structure */ dev_lock_list(); bridge->dev = DEV_GET(bridge); LOG(2, (KERN_DEBUG "bridge-%s: got dev %p\n", bridge->name, bridge->dev)); if (bridge->dev == NULL) { dev_unlock_list(); retval = -ENODEV; goto out; } if (!(bridge->dev->flags & IFF_UP)) { LOG(2, (KERN_DEBUG "bridge-%s: interface %s is not up\n", bridge->name, bridge->dev->name)); dev_unlock_list(); retval = -ENODEV; goto out; } /* * At a minimum, the header size should be the same as ours. * * XXX we should either do header translation or ensure this * is an Ethernet. */ if (bridge->dev->hard_header_len != ETH_HLEN && bridge->dev->hard_header_len != ETH_HLEN + 4) { LOG(1, (KERN_DEBUG "bridge-%s: can't bridge with %s, bad header length %d\n", bridge->name, bridge->dev->name, bridge->dev->hard_header_len)); dev_unlock_list(); retval = -EINVAL; goto out; } /* * Get a socket to play with * * We set the dead field so we don't get a call back from dev_kfree_skb(). * (The alternative is to support the callback.) */ bridge->sk = compat_sk_alloc(bridge, GFP_ATOMIC); if (bridge->sk == NULL) { dev_unlock_list(); retval = -ENOMEM; goto out; } SET_SK_DEAD(bridge->sk, 1); bridge->wirelessAdapter = VNetBridgeIsDeviceWireless(bridge->dev); /* * If it is a wireless adapter initialize smac struct. */ if (bridge->wirelessAdapter) { LOG(1, (KERN_NOTICE "bridge-%s: is a Wireless Adapter\n", bridge->name)); SMAC_InitState(&(bridge->smac)); if (bridge->smac) { /* * Store the MAC address of the adapter */ SMAC_SetMac(bridge->smac, bridge->dev->dev_addr); } } /* * Link up with the peer device by adding a * packet handler to the networking stack. */ bridge->pt.func = VNetBridgeReceiveFromDev; bridge->pt.type = htons(ETH_P_ALL); bridge->pt.dev = bridge->dev; /* * TurboLinux10 uses 2.6.0-test5, which we do not support, so special case it, * 2.6.0 with tl_kernel_version_h is 2.6.0-pre5... */ #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0) || \ (LINUX_VERSION_CODE == KERNEL_VERSION(2, 6, 0) && defined(__tl_kernel_version_h__)) bridge->pt.data = bridge->sk; #else bridge->pt.af_packet_priv = bridge->sk; #endif bridge->enabledPromisc = FALSE; bridge->warnPromisc = FALSE; dev_add_pack(&bridge->pt); dev_unlock_list(); /* * Put in promiscuous mode if need be. */ down(&vnetStructureSemaphore); if (VNetGetAttachedPorts(&bridge->port.jack)) { VNetBridgeStartPromisc(bridge, rtnlLock); } up(&vnetStructureSemaphore); /* * Finish up */ LOG(1, (KERN_DEBUG "bridge-%s: up\n", bridge->name)); /* * Return */ out: if (retval != 0) { if (bridge->sk != NULL) { sk_free(bridge->sk); bridge->sk = NULL; } bridge->dev = NULL; } return retval; } /* *---------------------------------------------------------------------- * * VNetBridgeDown -- * * Bring a bridge down. Stops promiscuous mode, removes the * packet handler from the network stack, and frees the * socket. * * Results: * None. * * Side effects: * Bridging is brought down. * *---------------------------------------------------------------------- */ void VNetBridgeDown(VNetBridge *bridge, // IN: bridge Bool rtnlLock) // IN: acquire RTNL lock { if (bridge->dev == NULL) { LOG(0, (KERN_NOTICE "bridge-%s: already down\n", bridge->name)); return; } VNetBridgeStopPromisc(bridge, rtnlLock); if (bridge->smac){ SMAC_SetMac(bridge->smac, NULL); } bridge->dev = NULL; dev_remove_pack(&bridge->pt); sk_free(bridge->sk); bridge->sk = NULL; LOG(1, (KERN_DEBUG "bridge-%s: down\n", bridge->name)); } /* *----------------------------------------------------------------------------- * * VNetBridgeNotify -- * * Callback on peer device state change. The function brings * the bridge up/down in response to changes in the peer device. * * Results: * NOTIFY_DONE * * Side effects: * Promiscuous mode is changed when bridge brought up/down. * *----------------------------------------------------------------------------- */ int VNetBridgeNotify(struct notifier_block *this, // IN: callback data (bridge) u_long msg, // IN: type of event void *data) // IN: device pertaining to event { VNetBridge *bridge = list_entry(this, VNetBridge, notifier); struct net_device *dev = (struct net_device *) data; switch (msg) { case NETDEV_UNREGISTER: LOG(2, (KERN_DEBUG "bridge-%s: interface %s is unregistering\n", bridge->name, dev->name)); if (dev == bridge->dev) { /* This should never happen --hpreg */ LOG(0, (KERN_WARNING "bridge-%s: interface %s unregistered without " "going down! Disabling the bridge\n", bridge->name, dev->name)); VNetBridgeDown(bridge, FALSE); } break; case NETDEV_DOWN: LOG(2, (KERN_DEBUG "bridge-%s: interface %s is going down\n", bridge->name, dev->name)); if (dev == bridge->dev) { LOG(1, (KERN_DEBUG "bridge-%s: disabling the bridge\n", bridge->name)); VNetBridgeDown(bridge, FALSE); } break; case NETDEV_UP: LOG(2, (KERN_DEBUG "bridge-%s: interface %s is going up\n", bridge->name, dev->name)); if (bridge->dev == NULL && VNetBridgeDevCompatible(bridge, dev)) { int errno; LOG(1, (KERN_DEBUG "bridge-%s: enabling the bridge\n", bridge->name)); errno = VNetBridgeUp(bridge, FALSE); switch (-errno) { case 0: break; case ENODEV: LOG(0, (KERN_WARNING "bridge-%s: interface %s not found or not " "up\n", bridge->name, dev->name)); break; case EINVAL: LOG(0, (KERN_WARNING "bridge-%s: interface %s is not a valid " "Ethernet interface\n", bridge->name, dev->name)); break; case ENOMEM: LOG(0, (KERN_WARNING "bridge-%s: failed to allocate memory\n", bridge->name)); break; default: /* This should never happen --hpreg */ LOG(0, (KERN_WARNING "bridge-%s: failed to enable the bridge to " "interface %s (error %d)\n", bridge->name, dev->name, -errno)); break; } } break; default: LOG(2, (KERN_DEBUG "bridge-%s: interface %s is sending notification " "0x%lx\n", bridge->name, dev->name, msg)); break; } return NOTIFY_DONE; } /* *---------------------------------------------------------------------- * * VNetBridgeComputeHeaderPos -- * * Compute correct position for UDP/TCP header. * * Results: * None. * * Side effects: * transport header pointer updated to point to the tcp/udp header. * *---------------------------------------------------------------------- */ static INLINE_SINGLE_CALLER void VNetBridgeComputeHeaderPos(struct sk_buff *skb) // IN: buffer to examine { /* Maybe some kernel gets it right... */ if (compat_skb_network_header_len(skb)) { return; } switch (be16_to_cpu(skb->protocol)) { case ETH_P_IP: { struct iphdr *ipHdr = compat_skb_ip_header(skb); compat_skb_set_transport_header(skb, compat_skb_network_offset(skb) + ipHdr->ihl * 4); } return; default: LOG(3, (KERN_DEBUG "Unknown EII protocol %04X: csum at %d\n", be16_to_cpu(skb->protocol), compat_skb_csum_offset(skb))); break; } return; } /* * We deal with three types of kernels: * New kernels: skb_shinfo() has gso_size member, and there is * skb_gso_segment() helper to split GSO skb into flat ones. * Older kernels: skb_shinfo() has tso_size member, and there is * no helper. * Oldest kernels: without any segmentation offload support. */ #if defined(NETIF_F_GSO) || LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 18) #define VNetBridgeIsGSO(skb) skb_shinfo(skb)->gso_size #define VNetBridgeGSOSegment(skb) skb_gso_segment(skb, 0) #elif defined(NETIF_F_TSO) #define VNetBridgeIsGSO(skb) skb_shinfo(skb)->tso_size /* *---------------------------------------------------------------------- * * VNetBridgeGSOSegment -- * * Split a large TCP/IPv4 sk_buff into multiple sk_buffs of * size skb_shinfo(skb)->tso_size * Called from VNetBridgeSendLargePacket(). * * Results: * List of skbs created. * * Side effects: * The incoming packet is split into multiple packets. * *---------------------------------------------------------------------- */ static struct sk_buff * VNetBridgeGSOSegment(struct sk_buff *skb) // IN: packet to split { struct sk_buff *segs = NULL; struct sk_buff **next = &segs; int bytesPerPacket, bytesLeft; int macHdrLen, ipHdrLen, tcpHdrLen, allHdrLen; int curByteOffset; uint16 ipID; uint32 seqNo; if (((struct ethhdr *)compat_skb_mac_header(skb))->h_proto != htons(ETH_P_IP)) { return ERR_PTR(-EPFNOSUPPORT); } if (compat_skb_ip_header(skb)->protocol != IPPROTO_TCP) { return ERR_PTR(-EPROTONOSUPPORT); } macHdrLen = compat_skb_network_header(skb) - compat_skb_mac_header(skb); ipHdrLen = compat_skb_ip_header(skb)->ihl << 2; tcpHdrLen = compat_skb_tcp_header(skb)->doff << 2; allHdrLen = macHdrLen + ipHdrLen + tcpHdrLen; ipID = ntohs(compat_skb_ip_header(skb)->id); seqNo = ntohl(compat_skb_tcp_header(skb)->seq); /* Host TCP stack populated this (MSS) for the host NIC driver */ bytesPerPacket = skb_shinfo(skb)->tso_size; bytesLeft = skb->len - allHdrLen; curByteOffset = allHdrLen; while (bytesLeft) { struct sk_buff *newSkb; int payloadSize = (bytesLeft < bytesPerPacket) ? bytesLeft : bytesPerPacket; newSkb = dev_alloc_skb(payloadSize + allHdrLen + NET_IP_ALIGN); if (!newSkb) { while (segs) { newSkb = segs; segs = segs->next; newSkb->next = NULL; dev_kfree_skb(newSkb); } return ERR_PTR(-ENOMEM); } skb_reserve(newSkb, NET_IP_ALIGN); newSkb->dev = skb->dev; newSkb->protocol = skb->protocol; newSkb->pkt_type = skb->pkt_type; newSkb->ip_summed = VM_CHECKSUM_PARTIAL; /* * MAC+IP+TCP copy * This implies that ALL fields in the IP and TCP headers are copied from * the original skb. This is convenient: we'll only fix up fields that * need to be changed below */ memcpy(skb_put(newSkb, allHdrLen), skb->data, allHdrLen); /* Fix up pointers to different layers */ compat_skb_reset_mac_header(newSkb); compat_skb_set_network_header(newSkb, macHdrLen); compat_skb_set_transport_header(newSkb, macHdrLen + ipHdrLen); /* Payload copy */ skb_copy_bits(skb, curByteOffset, compat_skb_tail_pointer(newSkb), payloadSize); skb_put(newSkb, payloadSize); curByteOffset+=payloadSize; bytesLeft -= payloadSize; /* Fix up IP hdr */ compat_skb_ip_header(newSkb)->tot_len = htons(payloadSize + tcpHdrLen + ipHdrLen); compat_skb_ip_header(newSkb)->id = htons(ipID); compat_skb_ip_header(newSkb)->check = 0; /* Recompute new IP checksum */ compat_skb_ip_header(newSkb)->check = ip_fast_csum(compat_skb_network_header(newSkb), compat_skb_ip_header(newSkb)->ihl); /* Fix up TCP hdr */ compat_skb_tcp_header(newSkb)->seq = htonl(seqNo); /* Clear FIN/PSH if not last packet */ if (bytesLeft > 0) { compat_skb_tcp_header(newSkb)->fin = 0; compat_skb_tcp_header(newSkb)->psh = 0; } /* Recompute partial TCP checksum */ compat_skb_tcp_header(newSkb)->check = ~csum_tcpudp_magic(compat_skb_ip_header(newSkb)->saddr, compat_skb_ip_header(newSkb)->daddr, payloadSize+tcpHdrLen, IPPROTO_TCP, 0); /* Offset of field */ newSkb->csum = offsetof(struct tcphdr, check); /* Join packet to the list of segments */ *next = newSkb; next = &newSkb->next; /* Bump up our counters */ ipID++; seqNo += payloadSize; } return segs; } #else #define VNetBridgeIsGSO(skb) (0) #define VNetBridgeGSOSegment(skb) ERR_PTR(-ENOSYS) #endif /* *---------------------------------------------------------------------- * * VNetBridgeSendLargePacket -- * * Split and send a large TCP/IPv4 sk_buff into multiple sk_buffs which * fits on wire. Called from VNetBridgeReceiveFromDev(), which is a * protocol handler called from the bottom half, so steady as she * goes... * * skb passed in is deallocated by function. * * Results: * None. * * Side effects: * The incoming packet is split into multiple packets and sent to the * vnet. * *---------------------------------------------------------------------- */ void VNetBridgeSendLargePacket(struct sk_buff *skb, // IN: packet to split VNetBridge *bridge) // IN: bridge { struct sk_buff *segs; segs = VNetBridgeGSOSegment(skb); dev_kfree_skb(skb); if (IS_ERR(segs)) { LOG(1, (KERN_DEBUG "bridge-%s: cannot segment packet: error %ld\n", bridge->name, PTR_ERR(segs))); return; } while (segs) { struct sk_buff *newSkb; newSkb = segs; segs = newSkb->next; newSkb->next = NULL; /* Send it along */ skb = newSkb; VNetSend(&bridge->port.jack, newSkb); } } /* *---------------------------------------------------------------------- * * VNetBridgeReceiveFromDev -- * * Receive a packet from a bridged peer device * * This is called from the bottom half. Must be careful. * * Results: * errno. * * Side effects: * A packet may be sent to the vnet. * *---------------------------------------------------------------------- */ #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 14) && \ !defined(VMW_TL10S64_WORKAROUND) int VNetBridgeReceiveFromDev(struct sk_buff *skb, // IN: packet to receive struct net_device *dev, // IN: unused struct packet_type *pt) // IN: pt (pointer to bridge) #else int VNetBridgeReceiveFromDev(struct sk_buff *skb, // IN: packet to receive struct net_device *dev, // IN: unused struct packet_type *pt, // IN: pt (pointer to bridge) struct net_device *real_dev) // IN: real device, unused #endif { VNetBridge *bridge = list_entry(pt, VNetBridge, pt); int i; unsigned long flags; if (bridge->dev == NULL) { LOG(3, (KERN_DEBUG "bridge-%s: received %d closed\n", bridge->name, (int) skb->len)); dev_kfree_skb(skb); return -EIO; // value is ignored anyway } /* * Check is this is a packet that we sent up to the host, and if * so then don't bother to receive the packet. */ spin_lock_irqsave(&bridge->historyLock, flags); for (i = 0; i < VNET_BRIDGE_HISTORY; i++) { struct sk_buff *s = bridge->history[i]; if (s != NULL && (s == skb || SKB_IS_CLONE_OF(skb, s))) { bridge->history[i] = NULL; spin_unlock_irqrestore(&bridge->historyLock, flags); dev_kfree_skb(s); LOG(3, (KERN_DEBUG "bridge-%s: receive %d self %d\n", bridge->name, (int) skb->len, i)); dev_kfree_skb(skb); return 0; } } spin_unlock_irqrestore(&bridge->historyLock, flags); # if LOGLEVEL >= 4 { struct timeval now; do_gettimeofday(&now); LOG(3, (KERN_DEBUG "bridge-%s: time %d\n", bridge->name, (int)((now.tv_sec * 1000000 + now.tv_usec) - (vnetTime.tv_sec * 1000000 + vnetTime.tv_usec)))); } # endif if (bridge->smac) { if (VNetCallSMACFunc(bridge->smac, &skb, compat_skb_mac_header(skb), SMAC_CheckPacketFromHost) != PacketStatusForwardPacket) { LOG(4, (KERN_NOTICE "bridge-%s: packet dropped .\n", bridge->name)); return 0; } } #ifdef KERNEL_2_3_15 skb = skb_share_check(skb, GFP_ATOMIC); if (!skb) { return 0; } #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 4, 4) /* * Unbelievable... Caller sets h.raw = nh.raw before invoking us... */ VNetBridgeComputeHeaderPos(skb); #endif #endif skb_push(skb, skb->data - compat_skb_mac_header(skb)); LOG(3, (KERN_DEBUG "bridge-%s: receive %d\n", bridge->name, (int) skb->len)); /* * If this is a large packet, chop chop chop (if supported)... */ if (VNetBridgeIsGSO(skb)) { VNetBridgeSendLargePacket(skb, bridge); } else { VNetSend(&bridge->port.jack, skb); } return 0; } /* *---------------------------------------------------------------------- * * VNetBridgeProcRead -- * * Callback for read operation on this bridge entry in vnets proc fs. * * Results: * Length of read operation. * * Side effects: * None. * *---------------------------------------------------------------------- */ int VNetBridgeProcRead(char *page, // IN/OUT: buffer to write into char **start, // OUT: 0 if file < 4k, else offset into page off_t off, // IN: (unused) offset of read into the file int count, // IN: (unused) maximum number of bytes to read int *eof, // OUT: TRUE if there is nothing more to read void *data) // IN: client data - pointer to bridge { VNetBridge *bridge = (VNetBridge*)data; int len = 0; if (!bridge) { return len; } len += VNetPrintPort(&bridge->port, page+len); len += sprintf(page+len, "dev %s ", bridge->name); len += sprintf(page+len, "\n"); *start = 0; *eof = 1; return len; }