add pfring patch to 2.6

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@2755 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 1833 insertions, 0 deletions

diff --git a/openwrt/target/linux/linux-2.6/patches/generic/104-pf_ring.patch b/openwrt/target/linux/linux-2.6/patches/generic/104-pf_ring.patch
new file mode 100644
index 0000000000..527e5d5337
--- /dev/null
+++ b/openwrt/target/linux/linux-2.6/patches/generic/104-pf_ring.patch
@@ -0,0 +1,1833 @@
+diff --unified --recursive --new-file linux-2.6.15-rc6/include/linux/ring.h linux-2.6.15-rc6-1-686-smp-ring3/include/linux/ring.h
+--- linux-2.6.15-rc6/include/linux/ring.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.15-rc6-1-686-smp-ring3/include/linux/ring.h	2005-12-24 00:24:01.000000000 +0100
+@@ -0,0 +1,107 @@
++/*
++ * Definitions for packet ring
++ *
++ * 2004 - Luca Deri <deri@ntop.org>
++ */
++#ifndef __RING_H
++#define __RING_H
++
++
++#define INCLUDE_MAC_INFO
++
++#ifdef INCLUDE_MAC_INFO
++#define SKB_DISPLACEMENT    14 /* Include MAC address information */
++#else
++#define SKB_DISPLACEMENT    0  /* Do NOT include MAC address information */
++#endif
++
++#define RING_MAGIC
++#define RING_MAGIC_VALUE      0x88
++#define RING_FLOWSLOT_VERSION    6
++#define RING_VERSION          "3.1"
++
++#define SO_ADD_TO_CLUSTER        99
++#define SO_REMOVE_FROM_CLUSTER  100
++#define SO_SET_REFLECTOR        101
++
++/* *********************************** */
++
++#ifndef HAVE_PCAP
++struct pcap_pkthdr {
++  struct timeval ts;    /* time stamp */
++  u_int32_t caplen;     /* length of portion present */
++  u_int32_t len;        /* length this packet (off wire) */
++};
++#endif
++
++/* *********************************** */
++
++enum cluster_type {
++  cluster_per_flow = 0,
++  cluster_round_robin
++};
++
++/* *********************************** */
++
++#define RING_MIN_SLOT_SIZE    (60+sizeof(struct pcap_pkthdr))
++#define RING_MAX_SLOT_SIZE    (1514+sizeof(struct pcap_pkthdr))
++
++/* *********************************** */
++
++typedef struct flowSlotInfo {
++  u_int16_t version, sample_rate;
++  u_int32_t tot_slots, slot_len, data_len, tot_mem;
++  
++  u_int64_t tot_pkts, tot_lost;
++  u_int64_t tot_insert, tot_read;  
++  u_int32_t insert_idx, remove_idx;
++} FlowSlotInfo;
++
++/* *********************************** */
++
++typedef struct flowSlot {
++#ifdef RING_MAGIC
++  u_char     magic;      /* It must alwasy be zero */
++#endif
++  u_char     slot_state; /* 0=empty, 1=full   */
++  u_char     bucket;     /* bucket[bucketLen] */
++} FlowSlot;
++
++/* *********************************** */
++
++#ifdef __KERNEL__ 
++
++FlowSlotInfo* getRingPtr(void);
++int allocateRing(char *deviceName, u_int numSlots,
++		 u_int bucketLen, u_int sampleRate);
++unsigned int pollRing(struct file *fp, struct poll_table_struct * wait);
++void deallocateRing(void);
++
++/* ************************* */
++
++typedef int (*handle_ring_skb)(struct sk_buff *skb,
++			       u_char recv_packet, u_char real_skb);
++extern handle_ring_skb get_skb_ring_handler(void);
++extern void set_skb_ring_handler(handle_ring_skb the_handler);
++extern void do_skb_ring_handler(struct sk_buff *skb,
++				u_char recv_packet, u_char real_skb);
++
++typedef int (*handle_ring_buffer)(struct net_device *dev, 
++				     char *data, int len);
++extern handle_ring_buffer get_buffer_ring_handler(void);
++extern void set_buffer_ring_handler(handle_ring_buffer the_handler);
++extern int do_buffer_ring_handler(struct net_device *dev,
++				  char *data, int len);
++#endif /* __KERNEL__  */
++
++/* *********************************** */
++
++#define PF_RING          27      /* Packet Ring */
++#define SOCK_RING        PF_RING
++
++/* ioctl() */
++#define SIORINGPOLL      0x8888
++
++/* *********************************** */
++
++#endif /* __RING_H */
+diff --unified --recursive --new-file linux-2.6.15-rc6/net/core/dev.c linux-2.6.15-rc6-1-686-smp-ring3/net/core/dev.c
+--- linux-2.6.15-rc6/net/core/dev.c	2005-12-19 01:36:54.000000000 +0100
++++ linux-2.6.15-rc6-1-686-smp-ring3/net/core/dev.c	2005-12-24 00:24:02.000000000 +0100
+@@ -115,6 +115,56 @@
+ #endif	/* CONFIG_NET_RADIO */
+ #include <asm/current.h>
+ 
++#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
++
++/* #define RING_DEBUG */
++
++#include <linux/ring.h>
++#include <linux/version.h>
++
++static handle_ring_skb ring_handler = NULL;
++
++handle_ring_skb get_skb_ring_handler() { return(ring_handler); }
++
++void set_skb_ring_handler(handle_ring_skb the_handler) {
++  ring_handler = the_handler;
++}
++
++void do_skb_ring_handler(struct sk_buff *skb,
++			 u_char recv_packet, u_char real_skb) {
++  if(ring_handler)
++    ring_handler(skb, recv_packet, real_skb);
++}
++
++/* ******************* */
++
++static handle_ring_buffer buffer_ring_handler = NULL;
++
++handle_ring_buffer get_buffer_ring_handler() { return(buffer_ring_handler); }
++
++void set_buffer_ring_handler(handle_ring_buffer the_handler) {
++  buffer_ring_handler = the_handler;
++}
++
++int do_buffer_ring_handler(struct net_device *dev, char *data, int len) {
++  if(buffer_ring_handler) {
++    buffer_ring_handler(dev, data, len);
++    return(1);
++  } else 
++    return(0);
++}
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++EXPORT_SYMBOL(get_skb_ring_handler);
++EXPORT_SYMBOL(set_skb_ring_handler);
++EXPORT_SYMBOL(do_skb_ring_handler);
++
++EXPORT_SYMBOL(get_buffer_ring_handler);
++EXPORT_SYMBOL(set_buffer_ring_handler);
++EXPORT_SYMBOL(do_buffer_ring_handler);
++#endif
++
++#endif
+ /*
+  *	The list of packet types we will receive (as opposed to discard)
+  *	and the routines to invoke.
+@@ -1296,6 +1346,10 @@
+ 	skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
+ #endif
+ 	if (q->enqueue) {
++#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
++	if(ring_handler) ring_handler(skb, 0, 1);
++#endif /* CONFIG_RING */
++
+ 		/* Grab device queue */
+ 		spin_lock(&dev->queue_lock);
+ 
+@@ -1437,6 +1491,13 @@
+ 
+ 	preempt_disable();
+ 	err = netif_rx(skb);
++#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
++	if(ring_handler && ring_handler(skb, 1, 1)) {
++	  /* The packet has been copied into a ring */
++	  return(NET_RX_SUCCESS);
++	}
++#endif /* CONFIG_RING */
++
+ 	if (local_softirq_pending())
+ 		do_softirq();
+ 	preempt_enable();
+@@ -1582,6 +1643,13 @@
+ 	struct net_device *orig_dev;
+ 	int ret = NET_RX_DROP;
+ 	unsigned short type;
++#if defined (CONFIG_RING) || defined(CONFIG_RING_MODULE)
++	if(ring_handler && ring_handler(skb, 1, 1)) {
++	  /* The packet has been copied into a ring */
++	  return(NET_RX_SUCCESS);
++	}
++#endif /* CONFIG_RING */
++
+ 
+ 	/* if we've gotten here through NAPI, check netpoll */
+ 	if (skb->dev->poll && netpoll_rx(skb))
+diff --unified --recursive --new-file linux-2.6.15-rc6/net/Kconfig linux-2.6.15-rc6-1-686-smp-ring3/net/Kconfig
+--- linux-2.6.15-rc6/net/Kconfig	2005-12-19 01:36:54.000000000 +0100
++++ linux-2.6.15-rc6-1-686-smp-ring3/net/Kconfig	2005-12-24 00:24:02.000000000 +0100
+@@ -31,6 +31,7 @@
+ source "net/unix/Kconfig"
+ source "net/xfrm/Kconfig"
+ 
++source "net/ring/Kconfig"
+ config INET
+ 	bool "TCP/IP networking"
+ 	---help---
+diff --unified --recursive --new-file linux-2.6.15-rc6/net/Makefile linux-2.6.15-rc6-1-686-smp-ring3/net/Makefile
+--- linux-2.6.15-rc6/net/Makefile	2005-12-19 01:36:54.000000000 +0100
++++ linux-2.6.15-rc6-1-686-smp-ring3/net/Makefile	2005-12-24 00:24:02.000000000 +0100
+@@ -42,6 +42,7 @@
+ obj-$(CONFIG_DECNET)		+= decnet/
+ obj-$(CONFIG_ECONET)		+= econet/
+ obj-$(CONFIG_VLAN_8021Q)	+= 8021q/
++obj-$(CONFIG_RING)		+= ring/
+ obj-$(CONFIG_IP_DCCP)		+= dccp/
+ obj-$(CONFIG_IP_SCTP)		+= sctp/
+ obj-$(CONFIG_IEEE80211)		+= ieee80211/
+diff --unified --recursive --new-file linux-2.6.15-rc6/net/ring/Kconfig linux-2.6.15-rc6-1-686-smp-ring3/net/ring/Kconfig
+--- linux-2.6.15-rc6/net/ring/Kconfig	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.15-rc6-1-686-smp-ring3/net/ring/Kconfig	2005-12-24 00:24:02.000000000 +0100
+@@ -0,0 +1,14 @@
++config RING
++	tristate "PF_RING sockets (EXPERIMENTAL)"
++	depends on EXPERIMENTAL
++	---help---
++	  PF_RING socket family, optimized for packet capture.
++          If a PF_RING socket is bound to an adapter (via the bind() system
++          call), such adapter will be used in read-only mode until the socket
++          is destroyed. Whenever an incoming packet is received from the adapter
++          it will not passed to upper layers, but instead it is copied to a ring
++          buffer, which in turn is exported to user space applications via mmap.
++          Please refer to http://luca.ntop.org/Ring.pdf for more.
++
++	  Say N unless you know what you are doing.
++
+diff --unified --recursive --new-file linux-2.6.15-rc6/net/ring/Makefile linux-2.6.15-rc6-1-686-smp-ring3/net/ring/Makefile
+--- linux-2.6.15-rc6/net/ring/Makefile	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.15-rc6-1-686-smp-ring3/net/ring/Makefile	2005-12-24 00:24:02.000000000 +0100
+@@ -0,0 +1,7 @@
++#
++# Makefile for the ring driver.
++#
++
++obj-m += ring.o
++
++ring-objs := ring_packet.o
+diff --unified --recursive --new-file linux-2.6.15-rc6/net/ring/ring_packet.c linux-2.6.15-rc6-1-686-smp-ring3/net/ring/ring_packet.c
+--- linux-2.6.15-rc6/net/ring/ring_packet.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.15-rc6-1-686-smp-ring3/net/ring/ring_packet.c	2005-12-24 00:24:02.000000000 +0100
+@@ -0,0 +1,1568 @@
++/*
++ *
++ * (C) 2004-05 - Luca Deri <deri@ntop.org>
++ *
++ * This code includes contributions courtesy of
++ * - Jeff Randall <jrandall@nexvu.com>
++ * - Helmut Manck <helmut.manck@secunet.com>
++ * - Brad Doctor <brad@stillsecure.com>
++ * - Amit D. Chaudhary <amit_ml@rajgad.com>
++ *
++ */
++
++/* 
++   TO DO:
++   add an entry inside the /proc filesystem 
++*/
++
++#include <linux/version.h>
++#include <linux/config.h>
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/socket.h>
++#include <linux/skbuff.h>
++#include <linux/rtnetlink.h>
++#include <linux/in.h>
++#include <linux/in6.h>
++#include <linux/init.h>
++#include <linux/filter.h>
++#include <linux/ring.h>
++#include <linux/ip.h>
++#include <linux/tcp.h>
++#include <linux/udp.h>
++#include <linux/list.h>
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++#include <net/xfrm.h>
++#else
++#include <linux/poll.h>
++#endif
++#include <net/sock.h>
++#include <asm/io.h>   /* needed for virt_to_phys() */
++
++/* #define RING_DEBUG */
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,11))
++static inline int remap_page_range(struct vm_area_struct *vma,
++				   unsigned long uvaddr,
++				   unsigned long paddr,
++				   unsigned long size,
++				   pgprot_t prot) {
++  return(remap_pfn_range(vma, uvaddr, paddr >> PAGE_SHIFT,
++			 size, prot));
++}
++#endif
++
++/* ************************************************* */
++
++#define CLUSTER_LEN       8
++
++struct ring_cluster {
++  u_short             cluster_id; /* 0 = no cluster */
++  u_short             num_cluster_elements;
++  enum cluster_type   hashing_mode;
++  u_short             hashing_id;
++  struct sock         *sk[CLUSTER_LEN];
++  struct ring_cluster *next;      /* NULL = last element of the cluster */
++};
++
++/* ************************************************* */
++
++struct ring_element {
++  struct list_head  list;
++  struct sock      *sk;
++};
++
++/* ************************************************* */
++
++struct ring_opt {
++  struct net_device *ring_netdev;
++
++  /* Cluster */
++  u_short cluster_id; /* 0 = no cluster */
++
++  /* Reflector */
++  struct net_device *reflector_dev;
++
++  /* Packet buffers */
++  unsigned long order;
++
++  /* Ring Slots */
++  unsigned long ring_memory;
++  FlowSlotInfo *slots_info; /* Basically it points to ring_memory */
++  char *ring_slots;  /* Basically it points to ring_memory
++			+sizeof(FlowSlotInfo) */
++
++  /* Packet Sampling */
++  u_int pktToSample, sample_rate;
++
++  /* BPF Filter */
++  struct sk_filter *bpfFilter;
++
++  /* Locks */
++  atomic_t num_ring_slots_waiters;
++  wait_queue_head_t ring_slots_waitqueue;
++  rwlock_t ring_index_lock;
++
++  /* Indexes (Internal) */
++  u_int insert_page_id, insert_slot_id;
++};
++
++/* ************************************************* */
++
++/* List of all ring sockets. */
++static struct list_head ring_table;
++
++/* List of all clusters */
++static struct ring_cluster *ring_cluster_list;
++
++static rwlock_t ring_mgmt_lock = RW_LOCK_UNLOCKED;
++
++/* ********************************** */
++
++/* Forward */
++static struct proto_ops ring_ops;
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,11))
++static struct proto ring_proto;
++#endif
++
++static int skb_ring_handler(struct sk_buff *skb, u_char recv_packet,
++			    u_char real_skb);
++static int buffer_ring_handler(struct net_device *dev, char *data, int len);
++static int remove_from_cluster(struct sock *sock, struct ring_opt *pfr);
++
++/* Extern */
++
++/* ********************************** */
++
++/* Defaults */
++static u_int bucket_len = 128, num_slots = 4096, sample_rate = 1,
++  transparent_mode = 1, enable_tx_capture = 0;
++
++MODULE_PARM(bucket_len, "i");
++MODULE_PARM_DESC(bucket_len, "Number of ring buckets");
++MODULE_PARM(num_slots,  "i");
++MODULE_PARM_DESC(num_slots,  "Number of ring slots");
++MODULE_PARM(sample_rate, "i");
++MODULE_PARM_DESC(sample_rate, "Ring packet sample rate");
++MODULE_PARM(transparent_mode, "i");
++MODULE_PARM_DESC(transparent_mode,
++		 "Set to 1 to set transparent mode "
++		 "(slower but backwards compatible)");
++MODULE_PARM(enable_tx_capture, "i");
++MODULE_PARM_DESC(enable_tx_capture, "Set to 1 to capture outgoing packets");
++
++/* ********************************** */
++
++#define MIN_QUEUED_PKTS      64
++#define MAX_QUEUE_LOOPS      64
++
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++#define ring_sk_datatype(__sk) ((struct ring_opt *)__sk)
++#define ring_sk(__sk) ((__sk)->sk_protinfo)
++#else
++#define ring_sk_datatype(a) (a)
++#define ring_sk(__sk) ((__sk)->protinfo.pf_ring)
++#endif
++
++#define _rdtsc() ({ uint64_t x; asm volatile("rdtsc" : "=A" (x)); x; })
++
++/*
++  int dev_queue_xmit(struct sk_buff *skb)
++  skb->dev;
++  struct net_device *dev_get_by_name(const char *name)
++*/
++
++/* ********************************** */
++
++static void ring_sock_destruct(struct sock *sk) {
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++  skb_queue_purge(&sk->sk_receive_queue);
++
++  if (!sock_flag(sk, SOCK_DEAD)) {
++#if defined(RING_DEBUG)
++    printk("Attempt to release alive ring socket: %p\n", sk);
++#endif
++    return;
++  }
++
++  BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
++  BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
++#else
++
++  BUG_TRAP(atomic_read(&sk->rmem_alloc)==0);
++  BUG_TRAP(atomic_read(&sk->wmem_alloc)==0);
++
++  if (!sk->dead) {
++#if defined(RING_DEBUG)
++    printk("Attempt to release alive ring socket: %p\n", sk);
++#endif
++    return;
++  }
++#endif
++
++  kfree(ring_sk(sk));
++
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0))
++  MOD_DEC_USE_COUNT;
++#endif
++}
++
++/* ********************************** */
++/*
++ * ring_insert()
++ *
++ * store the sk in a new element and add it
++ * to the head of the list.
++ */
++static inline void ring_insert(struct sock *sk) {
++  struct ring_element *next;
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_insert()\n");
++#endif
++
++  next = kmalloc(sizeof(struct ring_element), GFP_ATOMIC);
++  if(next != NULL) {
++    next->sk = sk;
++    write_lock_irq(&ring_mgmt_lock);
++    list_add(&next->list, &ring_table);
++    write_unlock_irq(&ring_mgmt_lock);
++  } else {
++    if (net_ratelimit())
++      printk("RING: could not kmalloc slot!!\n");
++  }
++}
++
++/* ********************************** */
++/*
++ * ring_remove()
++ *
++ * For each of the elements in the list:
++ *  - check if this is the element we want to delete
++ *  - if it is, remove it from the list, and free it.
++ *
++ * stop when we find the one we're looking for (break),
++ * or when we reach the end of the list.
++ */
++static inline void ring_remove(struct sock *sk) {
++  struct list_head *ptr;
++  struct ring_element *entry;
++
++
++  for(ptr = ring_table.next; ptr != &ring_table; ptr = ptr->next) {
++    entry = list_entry(ptr, struct ring_element, list);
++
++    if(entry->sk == sk) {
++      write_lock_irq(&ring_mgmt_lock);
++      list_del(ptr);
++      kfree(ptr);
++      write_unlock_irq(&ring_mgmt_lock);
++      break;
++    }
++  }
++
++}
++
++/* ********************************** */
++
++static u_int32_t num_queued_pkts(struct ring_opt *pfr) {
++
++  if(pfr->ring_slots != NULL) {
++
++    u_int32_t tot_insert = pfr->slots_info->insert_idx,
++#if defined(RING_DEBUG)
++      tot_read = pfr->slots_info->tot_read, tot_pkts;
++#else
++    tot_read = pfr->slots_info->tot_read;
++#endif
++
++    if(tot_insert >= tot_read) {
++#if defined(RING_DEBUG)
++      tot_pkts = tot_insert-tot_read;
++#endif
++      return(tot_insert-tot_read);
++    } else {
++#if defined(RING_DEBUG)
++      tot_pkts = ((u_int32_t)-1)+tot_insert-tot_read;
++#endif
++      return(((u_int32_t)-1)+tot_insert-tot_read);
++    }
++
++#if defined(RING_DEBUG)
++    printk("-> num_queued_pkts=%d [tot_insert=%d][tot_read=%d]\n",
++	   tot_pkts, tot_insert, tot_read);
++#endif
++
++  } else
++    return(0);
++}
++
++/* ********************************** */
++
++static inline FlowSlot* get_insert_slot(struct ring_opt *pfr) {
++#if defined(RING_DEBUG)
++  printk("get_insert_slot(%d)\n", pfr->slots_info->insert_idx);
++#endif
++
++  if(pfr->ring_slots != NULL) {
++    FlowSlot *slot = (FlowSlot*)&(pfr->ring_slots[pfr->slots_info->insert_idx
++						  *pfr->slots_info->slot_len]);
++    return(slot);
++  } else
++    return(NULL);
++}
++
++/* ********************************** */
++
++static inline FlowSlot* get_remove_slot(struct ring_opt *pfr) {
++#if defined(RING_DEBUG)
++  printk("get_remove_slot(%d)\n", pfr->slots_info->remove_idx);
++#endif
++
++  if(pfr->ring_slots != NULL)
++    return((FlowSlot*)&(pfr->ring_slots[pfr->slots_info->remove_idx*
++					pfr->slots_info->slot_len]));
++  else
++    return(NULL);
++}
++
++/* ********************************** */
++
++static void add_skb_to_ring(struct sk_buff *skb,
++			    struct ring_opt *pfr,
++			    u_char recv_packet,
++			    u_char real_skb /* 1=skb 0=faked skb */) {
++  FlowSlot *theSlot;
++  int idx, displ;
++
++  if(recv_packet) {
++    /* Hack for identifying a packet received by the e1000 */
++    if(real_skb) {
++      displ = SKB_DISPLACEMENT;
++    } else
++      displ = 0; /* Received by the e1000 wrapper */
++  } else
++    displ = 0;
++
++  write_lock(&pfr->ring_index_lock);
++  pfr->slots_info->tot_pkts++;
++  write_unlock(&pfr->ring_index_lock);
++
++  /* BPF Filtering (from af_packet.c) */
++  if(pfr->bpfFilter != NULL) {
++    unsigned res = 1, len;
++
++    len = skb->len-skb->data_len;
++
++    write_lock(&pfr->ring_index_lock);
++    skb->data -= displ;
++    res = sk_run_filter(skb, pfr->bpfFilter->insns, pfr->bpfFilter->len);
++    skb->data += displ;
++    write_unlock(&pfr->ring_index_lock);
++
++    if(res == 0) {
++      /* Filter failed */
++
++#if defined(RING_DEBUG)
++      printk("add_skb_to_ring(skb): Filter failed [len=%d][tot=%llu]"
++	     "[insertIdx=%d][pkt_type=%d][cloned=%d]\n",
++	     (int)skb->len, pfr->slots_info->tot_pkts,
++	     pfr->slots_info->insert_idx,
++	     skb->pkt_type, skb->cloned);
++#endif
++
++      return;
++    }
++  }
++
++  /* ************************** */
++
++  if(pfr->sample_rate > 1) {
++    if(pfr->pktToSample == 0) {
++      write_lock(&pfr->ring_index_lock);
++      pfr->pktToSample = pfr->sample_rate;
++      write_unlock(&pfr->ring_index_lock);
++    } else {
++      write_lock(&pfr->ring_index_lock);
++      pfr->pktToSample--;
++      write_unlock(&pfr->ring_index_lock);
++
++#if defined(RING_DEBUG)
++      printk("add_skb_to_ring(skb): sampled packet [len=%d]"
++	     "[tot=%llu][insertIdx=%d][pkt_type=%d][cloned=%d]\n",
++	     (int)skb->len, pfr->slots_info->tot_pkts,
++	     pfr->slots_info->insert_idx,
++	     skb->pkt_type, skb->cloned);
++#endif
++      return;
++    }
++  }
++
++  /* ************************************* */
++
++  if((pfr->reflector_dev != NULL)
++     && (!netif_queue_stopped(pfr->reflector_dev))) {
++    int cpu = smp_processor_id();
++
++    /* increase reference counter so that this skb is not freed */
++    atomic_inc(&skb->users);
++
++    skb->data -= displ;
++
++    /* send it */
++    if (pfr->reflector_dev->xmit_lock_owner != cpu) {
++      spin_lock_bh(&pfr->reflector_dev->xmit_lock);
++      pfr->reflector_dev->xmit_lock_owner = cpu;
++      spin_unlock_bh(&pfr->reflector_dev->xmit_lock);
++
++      if (pfr->reflector_dev->hard_start_xmit(skb,
++					      pfr->reflector_dev) == 0) {
++        spin_lock_bh(&pfr->reflector_dev->xmit_lock);
++	pfr->reflector_dev->xmit_lock_owner = -1;
++	skb->data += displ;
++	spin_unlock_bh(&pfr->reflector_dev->xmit_lock);
++#if defined(RING_DEBUG)
++	printk("++ hard_start_xmit succeeded\n");
++#endif
++	return; /* OK */
++      }
++
++      spin_lock_bh(&pfr->reflector_dev->xmit_lock);
++      pfr->reflector_dev->xmit_lock_owner = -1;
++      spin_unlock_bh(&pfr->reflector_dev->xmit_lock);
++    }
++
++#if defined(RING_DEBUG)
++    printk("++ hard_start_xmit failed\n");
++#endif
++    skb->data += displ;
++    return; /* -ENETDOWN */
++  }
++
++  /* ************************************* */
++
++#if defined(RING_DEBUG)
++  printk("add_skb_to_ring(skb) [len=%d][tot=%llu][insertIdx=%d]"
++	 "[pkt_type=%d][cloned=%d]\n",
++	 (int)skb->len, pfr->slots_info->tot_pkts,
++	 pfr->slots_info->insert_idx,
++	 skb->pkt_type, skb->cloned);
++#endif
++
++  idx = pfr->slots_info->insert_idx;
++  theSlot = get_insert_slot(pfr);
++
++  if((theSlot != NULL) && (theSlot->slot_state == 0)) {
++    struct pcap_pkthdr *hdr;
++    char *bucket;
++
++    /* Update Index */
++    idx++;
++
++    if(idx == pfr->slots_info->tot_slots) {
++      write_lock(&pfr->ring_index_lock);
++      pfr->slots_info->insert_idx = 0;
++      write_unlock(&pfr->ring_index_lock);
++    } else {
++      write_lock(&pfr->ring_index_lock);
++      pfr->slots_info->insert_idx = idx;
++      write_unlock(&pfr->ring_index_lock);
++    }
++
++    bucket = &theSlot->bucket;
++    hdr = (struct pcap_pkthdr*)bucket;
++
++    /* BD - API changed for time keeping */
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14))
++    if(skb->stamp.tv_sec == 0) do_gettimeofday(&skb->stamp);
++
++    hdr->ts.tv_sec = skb->stamp.tv_sec, hdr->ts.tv_usec = skb->stamp.tv_usec;
++#else
++    if(skb->tstamp.off_sec == 0) __net_timestamp(skb);
++
++    hdr->ts.tv_sec = skb->tstamp.off_sec, hdr->ts.tv_usec = skb->tstamp.off_usec;
++#endif
++
++    hdr->caplen    = skb->len+displ;
++
++    if(hdr->caplen > pfr->slots_info->data_len)
++      hdr->caplen = pfr->slots_info->data_len;
++
++    hdr->len = skb->len+displ;
++    memcpy(&bucket[sizeof(struct pcap_pkthdr)],
++	   skb->data-displ, hdr->caplen);
++
++#if defined(RING_DEBUG)
++    {
++      static unsigned int lastLoss = 0;
++
++      if(pfr->slots_info->tot_lost
++	 && (lastLoss != pfr->slots_info->tot_lost)) {
++	printk("add_skb_to_ring(%d): [data_len=%d]"
++	       "[hdr.caplen=%d][skb->len=%d]"
++	       "[pcap_pkthdr=%d][removeIdx=%d]"
++	       "[loss=%lu][page=%u][slot=%u]\n",
++	       idx-1, pfr->slots_info->data_len, hdr->caplen, skb->len,
++	       sizeof(struct pcap_pkthdr),
++	       pfr->slots_info->remove_idx,
++	       (long unsigned int)pfr->slots_info->tot_lost,
++	       pfr->insert_page_id, pfr->insert_slot_id);
++
++	lastLoss = pfr->slots_info->tot_lost;
++      }
++    }
++#endif
++
++    write_lock(&pfr->ring_index_lock);
++    pfr->slots_info->tot_insert++;
++    theSlot->slot_state = 1;
++    write_unlock(&pfr->ring_index_lock);
++  } else {
++    write_lock(&pfr->ring_index_lock);
++    pfr->slots_info->tot_lost++;
++    write_unlock(&pfr->ring_index_lock);
++
++#if defined(RING_DEBUG)
++    printk("add_skb_to_ring(skb): packet lost [loss=%lu]"
++	   "[removeIdx=%u][insertIdx=%u]\n",
++	   (long unsigned int)pfr->slots_info->tot_lost,
++	   pfr->slots_info->remove_idx, pfr->slots_info->insert_idx);
++#endif
++  }
++
++  /* wakeup in case of poll() */
++  if(waitqueue_active(&pfr->ring_slots_waitqueue))
++    wake_up_interruptible(&pfr->ring_slots_waitqueue);
++}
++
++/* ********************************** */
++
++static u_int hash_skb(struct ring_cluster *cluster_ptr,
++		      struct sk_buff *skb, u_char recv_packet) {
++  u_int idx;
++  int displ;
++  struct iphdr *ip;
++
++  if(cluster_ptr->hashing_mode == cluster_round_robin) {
++    idx = cluster_ptr->hashing_id++;
++  } else {
++    /* Per-flow clustering */
++    if(skb->len > sizeof(struct iphdr)+sizeof(struct tcphdr)) {
++      if(recv_packet)
++	displ = 0;
++      else
++	displ = SKB_DISPLACEMENT;
++
++      /*
++	skb->data+displ
++
++	Always points to to the IP part of the packet
++      */
++
++      ip = (struct iphdr*)(skb->data+displ);
++
++      idx = ip->saddr+ip->daddr+ip->protocol;
++
++      if(ip->protocol == IPPROTO_TCP) {
++	struct tcphdr *tcp = (struct tcphdr*)(skb->data+displ
++					      +sizeof(struct iphdr));
++	idx += tcp->source+tcp->dest;
++      } else if(ip->protocol == IPPROTO_UDP) {
++	struct udphdr *udp = (struct udphdr*)(skb->data+displ
++					      +sizeof(struct iphdr));
++	idx += udp->source+udp->dest;
++      }
++    } else
++      idx = skb->len;
++  }
++
++  return(idx % cluster_ptr->num_cluster_elements);
++}
++
++/* ********************************** */
++
++static int skb_ring_handler(struct sk_buff *skb,
++			    u_char recv_packet,
++			    u_char real_skb /* 1=skb 0=faked skb */) {
++  struct sock *skElement;
++  int rc = 0;
++  struct list_head *ptr;
++  struct ring_cluster *cluster_ptr;
++
++#ifdef PROFILING
++  uint64_t rdt = _rdtsc(), rdt1, rdt2;
++#endif
++
++  if((!skb) /* Invalid skb */
++     || ((!enable_tx_capture) && (!recv_packet))) {
++    /*
++      An outgoing packet is about to be sent out
++      but we decided not to handle transmitted
++      packets.
++    */
++    return(0);
++  }
++
++#if defined(RING_DEBUG)
++  if(0) {
++    printk("skb_ring_handler() [len=%d][dev=%s]\n", skb->len,
++	   skb->dev->name == NULL ? "<NULL>" : skb->dev->name);
++  }
++#endif
++
++#ifdef PROFILING
++  rdt1 = _rdtsc();
++#endif
++
++  /* [1] Check unclustered sockets */
++  for (ptr = ring_table.next; ptr != &ring_table; ptr = ptr->next) {
++    struct ring_opt *pfr;
++    struct ring_element *entry;
++
++    entry = list_entry(ptr, struct ring_element, list);
++
++    read_lock(&ring_mgmt_lock);
++    skElement = entry->sk;
++    pfr = ring_sk(skElement);
++    read_unlock(&ring_mgmt_lock);
++
++    if((pfr != NULL)
++       && (pfr->cluster_id == 0 /* No cluster */)
++       && (pfr->ring_slots != NULL)
++       && (pfr->ring_netdev == skb->dev)) {
++      /* We've found the ring where the packet can be stored */
++      read_lock(&ring_mgmt_lock);
++      add_skb_to_ring(skb, pfr, recv_packet, real_skb);
++      read_unlock(&ring_mgmt_lock);
++
++      rc = 1; /* Ring found: we've done our job */
++    }
++  }
++
++  /* [2] Check socket clusters */
++  cluster_ptr = ring_cluster_list;
++
++  while(cluster_ptr != NULL) {
++    struct ring_opt *pfr;
++
++    if(cluster_ptr->num_cluster_elements > 0) {
++      u_int skb_hash = hash_skb(cluster_ptr, skb, recv_packet);
++
++      read_lock(&ring_mgmt_lock);
++      skElement = cluster_ptr->sk[skb_hash];
++      read_unlock(&ring_mgmt_lock);
++
++      if(skElement != NULL) {
++	pfr = ring_sk(skElement);
++
++	if((pfr != NULL)
++	   && (pfr->ring_slots != NULL)
++	   && (pfr->ring_netdev == skb->dev)) {
++	  /* We've found the ring where the packet can be stored */
++          read_lock(&ring_mgmt_lock);
++	  add_skb_to_ring(skb, pfr, recv_packet, real_skb);
++          read_unlock(&ring_mgmt_lock);
++
++	  rc = 1; /* Ring found: we've done our job */
++	}
++      }
++    }
++
++    cluster_ptr = cluster_ptr->next;
++  }
++
++#ifdef PROFILING
++  rdt1 = _rdtsc()-rdt1;
++#endif
++
++#ifdef PROFILING
++  rdt2 = _rdtsc();
++#endif
++
++  if(transparent_mode) rc = 0;
++
++  if((rc != 0) && real_skb)
++    dev_kfree_skb(skb); /* Free the skb */
++
++#ifdef PROFILING
++  rdt2 = _rdtsc()-rdt2;
++  rdt = _rdtsc()-rdt;
++
++#if defined(RING_DEBUG)
++  printk("# cycles: %d [lock costed %d %d%%][free costed %d %d%%]\n",
++	 (int)rdt, rdt-rdt1,
++	 (int)((float)((rdt-rdt1)*100)/(float)rdt),
++	 rdt2,
++	 (int)((float)(rdt2*100)/(float)rdt));
++#endif
++#endif
++
++  return(rc); /*  0 = packet not handled */
++}
++
++/* ********************************** */
++
++struct sk_buff skb;
++
++static int buffer_ring_handler(struct net_device *dev,
++			       char *data, int len) {
++
++#if defined(RING_DEBUG)
++  printk("buffer_ring_handler: [dev=%s][len=%d]\n",
++	 dev->name == NULL ? "<NULL>" : dev->name, len);
++#endif
++
++  /* BD - API changed for time keeping */
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14))
++  skb.dev = dev, skb.len = len, skb.data = data,
++    skb.data_len = len, skb.stamp.tv_sec = 0; /* Calculate the time */
++#else
++  skb.dev = dev, skb.len = len, skb.data = data,
++    skb.data_len = len, skb.tstamp.off_sec = 0; /* Calculate the time */
++#endif
++
++  skb_ring_handler(&skb, 1, 0 /* fake skb */);
++
++  return(0);
++}
++
++/* ********************************** */
++
++static int ring_create(struct socket *sock, int protocol) {
++  struct sock *sk;
++  struct ring_opt *pfr;
++  int err;
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_create()\n");
++#endif
++
++  /* Are you root, superuser or so ? */
++  if(!capable(CAP_NET_ADMIN))
++    return -EPERM;
++
++  if(sock->type != SOCK_RAW)
++    return -ESOCKTNOSUPPORT;
++
++  if(protocol != htons(ETH_P_ALL))
++    return -EPROTONOSUPPORT;
++
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0))
++  MOD_INC_USE_COUNT;
++#endif
++
++  err = -ENOMEM;
++
++  // BD: -- broke this out to keep it more simple and clear as to what the
++  // options are.
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11))
++  sk = sk_alloc(PF_RING, GFP_KERNEL, 1, NULL);
++#else
++  // BD: API changed in 2.6.12, ref:
++  // http://svn.clkao.org/svnweb/linux/revision/?rev=28201
++  sk = sk_alloc(PF_RING, GFP_ATOMIC, &ring_proto, 1);
++#endif
++#else
++  /* Kernel 2.4 */
++  sk = sk_alloc(PF_RING, GFP_KERNEL, 1);
++#endif
++
++  if (sk == NULL)
++    goto out;
++
++  sock->ops = &ring_ops;
++  sock_init_data(sock, sk);
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11))
++  sk_set_owner(sk, THIS_MODULE);
++#endif
++#endif
++
++  err = -ENOMEM;
++  ring_sk(sk) = ring_sk_datatype(kmalloc(sizeof(*pfr), GFP_KERNEL));
++
++  if (!(pfr = ring_sk(sk))) {
++    sk_free(sk);
++    goto out;
++  }
++  memset(pfr, 0, sizeof(*pfr));
++  init_waitqueue_head(&pfr->ring_slots_waitqueue);
++  pfr->ring_index_lock = RW_LOCK_UNLOCKED;
++  atomic_set(&pfr->num_ring_slots_waiters, 0);
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++  sk->sk_family       = PF_RING;
++  sk->sk_destruct     = ring_sock_destruct;
++#else
++  sk->family          = PF_RING;
++  sk->destruct        = ring_sock_destruct;
++  sk->num             = protocol;
++#endif
++
++  ring_insert(sk);
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_create() - created\n");
++#endif
++
++  return(0);
++ out:
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0))
++  MOD_DEC_USE_COUNT;
++#endif
++  return err;
++}
++
++/* *********************************************** */
++
++static int ring_release(struct socket *sock)
++{
++  struct sock *sk = sock->sk;
++  struct ring_opt *pfr = ring_sk(sk);
++
++  if(!sk)
++    return 0;
++
++#if defined(RING_DEBUG)
++  printk("RING: called ring_release\n");
++#endif
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_release entered\n");
++#endif
++
++  ring_remove(sk);
++
++  sock_orphan(sk);
++  sock->sk = NULL;
++
++  /* Free the ring buffer */
++  if(pfr->ring_memory) {
++    struct page *page, *page_end;
++
++    page_end = virt_to_page(pfr->ring_memory + (PAGE_SIZE << pfr->order) - 1);
++    for(page = virt_to_page(pfr->ring_memory); page <= page_end; page++)
++      ClearPageReserved(page);
++
++    free_pages(pfr->ring_memory, pfr->order);
++  }
++
++  kfree(pfr);
++  ring_sk(sk) = NULL;
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++  skb_queue_purge(&sk->sk_write_queue);
++#endif
++  sock_put(sk);
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_release leaving\n");
++#endif
++
++  return 0;
++}
++
++/* ********************************** */
++/*
++ * We create a ring for this socket and bind it to the specified device
++ */
++static int packet_ring_bind(struct sock *sk, struct net_device *dev)
++{
++  u_int the_slot_len;
++  u_int32_t tot_mem;
++  struct ring_opt *pfr = ring_sk(sk);
++  struct page *page, *page_end;
++
++  if(!dev) return(-1);
++
++#if defined(RING_DEBUG)
++  printk("RING: packet_ring_bind(%s) called\n", dev->name);
++#endif
++
++  /* **********************************************
++
++  *************************************
++  *                                   *
++  *        FlowSlotInfo               *
++  *                                   *
++  ************************************* <-+
++  *        FlowSlot                   *   |
++  *************************************   |
++  *        FlowSlot                   *   |
++  *************************************   +- num_slots
++  *        FlowSlot                   *   |
++  *************************************   |
++  *        FlowSlot                   *   |
++  ************************************* <-+
++
++  ********************************************** */
++
++  the_slot_len = sizeof(u_char)    /* flowSlot.slot_state */
++#ifdef RING_MAGIC
++    + sizeof(u_char)
++#endif
++    + sizeof(struct pcap_pkthdr)
++    + bucket_len      /* flowSlot.bucket */;
++
++  tot_mem = sizeof(FlowSlotInfo) + num_slots*the_slot_len;
++
++  /*
++    Calculate the value of the order parameter used later.
++    See http://www.linuxjournal.com/article.php?sid=1133
++  */
++  for(pfr->order = 0;(PAGE_SIZE << pfr->order) < tot_mem; pfr->order++)  ;
++
++  /*
++    We now try to allocate the memory as required. If we fail
++    we try to allocate a smaller amount or memory (hence a
++    smaller ring).
++  */
++  while((pfr->ring_memory = __get_free_pages(GFP_ATOMIC, pfr->order)) == 0)
++    if(pfr->order-- == 0)
++      break;
++
++  if(pfr->order == 0) {
++    printk("RING: ERROR not enough memory for ring\n");
++    return(-1);
++  } else {
++    printk("RING: succesfully allocated %lu KB [tot_mem=%d][order=%ld]\n",
++	   PAGE_SIZE >> (10 - pfr->order), tot_mem, pfr->order);
++  }
++
++  tot_mem = PAGE_SIZE << pfr->order;
++  memset((char*)pfr->ring_memory, 0, tot_mem);
++
++  /* Now we need to reserve the pages */
++  page_end = virt_to_page(pfr->ring_memory + (PAGE_SIZE << pfr->order) - 1);
++  for(page = virt_to_page(pfr->ring_memory); page <= page_end; page++)
++    SetPageReserved(page);
++
++  pfr->slots_info = (FlowSlotInfo*)pfr->ring_memory;
++  pfr->ring_slots = (char*)(pfr->ring_memory+sizeof(FlowSlotInfo));
++
++  pfr->slots_info->version     = RING_FLOWSLOT_VERSION;
++  pfr->slots_info->slot_len    = the_slot_len;
++  pfr->slots_info->data_len    = bucket_len;
++  pfr->slots_info->tot_slots   = (tot_mem-sizeof(FlowSlotInfo))/the_slot_len;
++  pfr->slots_info->tot_mem     = tot_mem;
++  pfr->slots_info->sample_rate = sample_rate;
++
++  printk("RING: allocated %d slots [slot_len=%d][tot_mem=%u]\n",
++	 pfr->slots_info->tot_slots, pfr->slots_info->slot_len,
++	 pfr->slots_info->tot_mem);
++
++#ifdef RING_MAGIC
++  {
++    int i;
++
++    for(i=0; i<pfr->slots_info->tot_slots; i++) {
++      unsigned long idx = i*pfr->slots_info->slot_len;
++      FlowSlot *slot = (FlowSlot*)&pfr->ring_slots[idx];
++      slot->magic = RING_MAGIC_VALUE; slot->slot_state = 0;
++    }
++  }
++#endif
++
++  pfr->insert_page_id = 1, pfr->insert_slot_id = 0;
++
++  /*
++    IMPORTANT
++    Leave this statement here as last one. In fact when
++    the ring_netdev != NULL the socket is ready to be used.
++  */
++  pfr->ring_netdev = dev;
++
++  return(0);
++}
++
++/* ************************************* */
++
++/* Bind to a device */
++static int ring_bind(struct socket *sock,
++		     struct sockaddr *sa, int addr_len)
++{
++  struct sock *sk=sock->sk;
++  struct net_device *dev = NULL;
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_bind() called\n");
++#endif
++
++  /*
++   *	Check legality
++   */
++  if (addr_len != sizeof(struct sockaddr))
++    return -EINVAL;
++  if (sa->sa_family != PF_RING)
++    return -EINVAL;
++
++  /* Safety check: add trailing zero if missing */
++  sa->sa_data[sizeof(sa->sa_data)-1] = '\0';
++
++#if defined(RING_DEBUG)
++  printk("RING: searching device %s\n", sa->sa_data);
++#endif
++
++  if((dev = __dev_get_by_name(sa->sa_data)) == NULL) {
++#if defined(RING_DEBUG)
++    printk("RING: search failed\n");
++#endif
++    return(-EINVAL);
++  } else
++    return(packet_ring_bind(sk, dev));
++}
++
++/* ************************************* */
++
++static int ring_mmap(struct file *file,
++		     struct socket *sock,
++		     struct vm_area_struct *vma)
++{
++  struct sock *sk = sock->sk;
++  struct ring_opt *pfr = ring_sk(sk);
++  unsigned long size, start;
++  u_int pagesToMap;
++  char *ptr;
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_mmap() called\n");
++#endif
++
++  if(pfr->ring_memory == 0) {
++#if defined(RING_DEBUG)
++    printk("RING: ring_mmap() failed: mapping area to an unbound socket\n");
++#endif
++    return -EINVAL;
++  }
++
++  size = (unsigned long)(vma->vm_end-vma->vm_start);
++
++  if(size % PAGE_SIZE) {
++#if defined(RING_DEBUG)
++    printk("RING: ring_mmap() failed: len is not multiple of PAGE_SIZE\n");
++#endif
++    return(-EINVAL);
++  }
++
++  /* if userspace tries to mmap beyond end of our buffer, fail */
++  if(size > pfr->slots_info->tot_mem) {
++#if defined(RING_DEBUG)
++    printk("proc_mmap() failed: area too large [%ld > %d]\n", size, pfr->slots_info->tot_mem);
++#endif
++    return(-EINVAL);
++  }
++
++  pagesToMap = size/PAGE_SIZE;
++
++#if defined(RING_DEBUG)
++  printk("RING: ring_mmap() called. %d pages to map\n", pagesToMap);
++#endif
++
++#if defined(RING_DEBUG)
++  printk("RING: mmap [slot_len=%d][tot_slots=%d] for ring on device %s\n",
++	 pfr->slots_info->slot_len, pfr->slots_info->tot_slots,
++	 pfr->ring_netdev->name);
++#endif
++
++  /* we do not want to have this area swapped out, lock it */
++  vma->vm_flags |= VM_LOCKED;
++  start = vma->vm_start;
++
++  /* Ring slots start from page 1 (page 0 is reserved for FlowSlotInfo) */
++  ptr = (char*)(start+PAGE_SIZE);
++
++  if(remap_page_range(
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++		      vma,
++#endif
++		      start,
++		      __pa(pfr->ring_memory),
++		      PAGE_SIZE*pagesToMap, vma->vm_page_prot)) {
++#if defined(RING_DEBUG)
++    printk("remap_page_range() failed\n");
++#endif
++    return(-EAGAIN);
++  }
++
++#if defined(RING_DEBUG)
++  printk("proc_mmap(pagesToMap=%d): success.\n", pagesToMap);
++#endif
++
++  return 0;
++}
++
++/* ************************************* */
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++static int ring_recvmsg(struct kiocb *iocb, struct socket *sock,
++			struct msghdr *msg, size_t len, int flags)
++#else
++  static int ring_recvmsg(struct socket *sock, struct msghdr *msg, int len,
++			  int flags, struct scm_cookie *scm)
++#endif
++{
++  FlowSlot* slot;
++  struct ring_opt *pfr = ring_sk(sock->sk);
++  u_int32_t queued_pkts, num_loops = 0;
++
++#if defined(RING_DEBUG)
++  printk("ring_recvmsg called\n");
++#endif
++
++  slot = get_remove_slot(pfr);
++
++  while((queued_pkts = num_queued_pkts(pfr)) < MIN_QUEUED_PKTS) {
++    wait_event_interruptible(pfr->ring_slots_waitqueue, 1);
++
++#if defined(RING_DEBUG)
++    printk("-> ring_recvmsg returning %d [queued_pkts=%d][num_loops=%d]\n",
++	   slot->slot_state, queued_pkts, num_loops);
++#endif
++
++    if(queued_pkts > 0) {
++      if(num_loops++ > MAX_QUEUE_LOOPS)
++	break;
++    }
++  }
++
++#if defined(RING_DEBUG)
++  if(slot != NULL)
++    printk("ring_recvmsg is returning [queued_pkts=%d][num_loops=%d]\n",
++	   queued_pkts, num_loops);
++#endif
++
++  return(queued_pkts);
++}
++
++/* ************************************* */
++
++unsigned int ring_poll(struct file * file,
++		       struct socket *sock, poll_table *wait)
++{
++  FlowSlot* slot;
++  struct ring_opt *pfr = ring_sk(sock->sk);
++
++#if defined(RING_DEBUG)
++  printk("poll called\n");
++#endif
++
++  slot = get_remove_slot(pfr);
++
++  if((slot != NULL) && (slot->slot_state == 0))
++    poll_wait(file, &pfr->ring_slots_waitqueue, wait);
++
++#if defined(RING_DEBUG)
++  printk("poll returning %d\n", slot->slot_state);
++#endif
++
++  if((slot != NULL) && (slot->slot_state == 1))
++    return(POLLIN | POLLRDNORM);
++  else
++    return(0);
++}
++
++/* ************************************* */
++
++int add_to_cluster_list(struct ring_cluster *el,
++			struct sock *sock) {
++
++  if(el->num_cluster_elements == CLUSTER_LEN)
++    return(-1); /* Cluster full */
++
++  ring_sk_datatype(ring_sk(sock))->cluster_id = el->cluster_id;
++  el->sk[el->num_cluster_elements] = sock;
++  el->num_cluster_elements++;
++  return(0);
++}
++
++/* ************************************* */
++
++int remove_from_cluster_list(struct ring_cluster *el,
++			     struct sock *sock) {
++  int i, j;
++
++  for(i=0; i<CLUSTER_LEN; i++)
++    if(el->sk[i] == sock) {
++      el->num_cluster_elements--;
++
++      if(el->num_cluster_elements > 0) {
++	/* The cluster contains other elements */
++	for(j=i; j<CLUSTER_LEN-1; j++)
++	  el->sk[j] = el->sk[j+1];
++
++	el->sk[CLUSTER_LEN-1] = NULL;
++      } else {
++	/* Empty cluster */
++	memset(el->sk, 0, sizeof(el->sk));
++      }
++
++      return(0);
++    }
++
++  return(-1); /* Not found */
++}
++
++/* ************************************* */
++
++static int remove_from_cluster(struct sock *sock,
++			       struct ring_opt *pfr)
++{
++  struct ring_cluster *el;
++
++#if defined(RING_DEBUG)
++  printk("--> remove_from_cluster(%d)\n", pfr->cluster_id);
++#endif
++
++  if(pfr->cluster_id == 0 /* 0 = No Cluster */)
++    return(0); /* Noting to do */
++
++  el = ring_cluster_list;
++
++  while(el != NULL) {
++    if(el->cluster_id == pfr->cluster_id) {
++      return(remove_from_cluster_list(el, sock));
++    } else
++      el = el->next;
++  }
++
++  return(-EINVAL); /* Not found */
++}
++
++/* ************************************* */
++
++static int add_to_cluster(struct sock *sock,
++			  struct ring_opt *pfr,
++			  u_short cluster_id)
++{
++  struct ring_cluster *el;
++
++#ifndef RING_DEBUG
++  printk("--> add_to_cluster(%d)\n", cluster_id);
++#endif
++
++  if(cluster_id == 0 /* 0 = No Cluster */) return(-EINVAL);
++
++  if(pfr->cluster_id != 0)
++    remove_from_cluster(sock, pfr);
++
++  el = ring_cluster_list;
++
++  while(el != NULL) {
++    if(el->cluster_id == cluster_id) {
++      return(add_to_cluster_list(el, sock));
++    } else
++      el = el->next;
++  }
++
++  /* There's no existing cluster. We need to create one */
++  if((el = kmalloc(sizeof(struct ring_cluster), GFP_KERNEL)) == NULL)
++    return(-ENOMEM);
++
++  el->cluster_id = cluster_id;
++  el->num_cluster_elements = 1;
++  el->hashing_mode = cluster_per_flow; /* Default */
++  el->hashing_id   = 0;
++
++  memset(el->sk, 0, sizeof(el->sk));
++  el->sk[0] = sock;
++  el->next = ring_cluster_list;
++  ring_cluster_list = el;
++  pfr->cluster_id = cluster_id;
++
++  return(0); /* 0 = OK */
++}
++
++/* ************************************* */
++
++/* Code taken/inspired from core/sock.c */
++static int ring_setsockopt(struct socket *sock,
++			   int level, int optname,
++			   char *optval, int optlen)
++{
++  struct ring_opt *pfr = ring_sk(sock->sk);
++  int val, found, ret = 0;
++  u_int cluster_id;
++  char devName[8];
++
++  if((optlen<sizeof(int)) || (pfr == NULL))
++    return(-EINVAL);
++
++  if (get_user(val, (int *)optval))
++    return -EFAULT;
++
++  found = 1;
++
++  switch(optname)
++    {
++    case SO_ATTACH_FILTER:
++      ret = -EINVAL;
++      if (optlen == sizeof(struct sock_fprog)) {
++	unsigned int fsize;
++	struct sock_fprog fprog;
++	struct sk_filter *filter;
++
++	ret = -EFAULT;
++
++	/*
++	  NOTE
++
++	  Do not call copy_from_user within a held
++	  splinlock (e.g. ring_mgmt_lock) as this caused
++	  problems when certain debugging was enabled under
++	  2.6.5 -- including hard lockups of the machine.
++	*/
++	if(copy_from_user(&fprog, optval, sizeof(fprog)))
++	  break;
++
++	fsize = sizeof(struct sock_filter) * fprog.len;
++	filter = kmalloc(fsize, GFP_KERNEL);
++
++	if(filter == NULL) {
++	  ret = -ENOMEM;
++	  break;
++	}
++
++	if(copy_from_user(filter->insns, fprog.filter, fsize))
++	  break;
++
++	filter->len = fprog.len;
++
++	if(sk_chk_filter(filter->insns, filter->len) != 0) {
++	  /* Bad filter specified */
++	  kfree(filter);
++	  pfr->bpfFilter = NULL;
++	  break;
++	}
++
++	/* get the lock, set the filter, release the lock */
++	write_lock(&ring_mgmt_lock);
++	pfr->bpfFilter = filter;
++	write_unlock(&ring_mgmt_lock);
++      }
++      ret = 0;
++      break;
++
++    case SO_DETACH_FILTER:
++      write_lock(&ring_mgmt_lock);
++      found = 1;
++      if(pfr->bpfFilter != NULL) {
++	kfree(pfr->bpfFilter);
++	pfr->bpfFilter = NULL;
++	write_unlock(&ring_mgmt_lock);
++	break;
++      }
++      ret = -ENONET;
++      break;
++
++    case SO_ADD_TO_CLUSTER:
++      if (optlen!=sizeof(val))
++	return -EINVAL;
++
++      if (copy_from_user(&cluster_id, optval, sizeof(cluster_id)))
++	return -EFAULT;
++
++      write_lock(&ring_mgmt_lock);
++      ret = add_to_cluster(sock->sk, pfr, cluster_id);
++      write_unlock(&ring_mgmt_lock);
++      break;
++
++    case SO_REMOVE_FROM_CLUSTER:
++      write_lock(&ring_mgmt_lock);
++      ret = remove_from_cluster(sock->sk, pfr);
++      write_unlock(&ring_mgmt_lock);
++      break;
++
++    case SO_SET_REFLECTOR:
++      if(optlen >= (sizeof(devName)-1))
++	return -EINVAL;
++
++      if(optlen > 0) {
++	if(copy_from_user(devName, optval, optlen))
++	  return -EFAULT;
++      }
++
++      devName[optlen] = '\0';
++
++#if defined(RING_DEBUG)
++      printk("+++ SO_SET_REFLECTOR(%s)\n", devName);
++#endif
++
++      write_lock(&ring_mgmt_lock);
++      pfr->reflector_dev = dev_get_by_name(devName);
++      write_unlock(&ring_mgmt_lock);
++
++#if defined(RING_DEBUG)
++      if(pfr->reflector_dev != NULL)
++	printk("SO_SET_REFLECTOR(%s): succeded\n", devName);
++      else
++	printk("SO_SET_REFLECTOR(%s): device unknown\n", devName);
++#endif
++      break;
++
++    default:
++      found = 0;
++      break;
++    }
++
++  if(found)
++    return(ret);
++  else
++    return(sock_setsockopt(sock, level, optname, optval, optlen));
++}
++
++/* ************************************* */
++
++static int ring_ioctl(struct socket *sock,
++		      unsigned int cmd, unsigned long arg)
++{
++  switch(cmd)
++    {
++    case SIOCGIFFLAGS:
++    case SIOCSIFFLAGS:
++    case SIOCGIFCONF:
++    case SIOCGIFMETRIC:
++    case SIOCSIFMETRIC:
++    case SIOCGIFMEM:
++    case SIOCSIFMEM:
++    case SIOCGIFMTU:
++    case SIOCSIFMTU:
++    case SIOCSIFLINK:
++    case SIOCGIFHWADDR:
++    case SIOCSIFHWADDR:
++    case SIOCSIFMAP:
++    case SIOCGIFMAP:
++    case SIOCSIFSLAVE:
++    case SIOCGIFSLAVE:
++    case SIOCGIFINDEX:
++    case SIOCGIFNAME:
++    case SIOCGIFCOUNT:
++    case SIOCSIFHWBROADCAST:
++      return(dev_ioctl(cmd,(void *) arg));
++
++    default:
++      return -EOPNOTSUPP;
++    }
++
++  return 0;
++}
++
++/* ************************************* */
++
++static struct proto_ops ring_ops = {
++  .family	=	PF_RING,
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++  .owner	=	THIS_MODULE,
++#endif
++
++  /* Operations that make no sense on ring sockets. */
++  .connect	=	sock_no_connect,
++  .socketpair	=	sock_no_socketpair,
++  .accept	=	sock_no_accept,
++  .getname	=	sock_no_getname,
++  .listen	=	sock_no_listen,
++  .shutdown	=	sock_no_shutdown,
++  .sendpage	=	sock_no_sendpage,
++  .sendmsg	=	sock_no_sendmsg,
++  .getsockopt	=	sock_no_getsockopt,
++
++  /* Now the operations that really occur. */
++  .release	=	ring_release,
++  .bind		=	ring_bind,
++  .mmap		=	ring_mmap,
++  .poll		=	ring_poll,
++  .setsockopt	=	ring_setsockopt,
++  .ioctl	=	ring_ioctl,
++  .recvmsg	=	ring_recvmsg,
++};
++
++/* ************************************ */
++
++static struct net_proto_family ring_family_ops = {
++  .family	=	PF_RING,
++  .create	=	ring_create,
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++  .owner	=	THIS_MODULE,
++#endif
++};
++
++// BD: API changed in 2.6.12, ref:
++// http://svn.clkao.org/svnweb/linux/revision/?rev=28201
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,11))
++static struct proto ring_proto = {
++  .name		=	"PF_RING",
++  .owner	=	THIS_MODULE,
++  .obj_size	=	sizeof(struct sock),
++};
++#endif
++
++/* ************************************ */
++
++static void __exit ring_exit(void)
++{
++  struct list_head *ptr;
++  struct ring_element *entry;
++
++  for(ptr = ring_table.next; ptr != &ring_table; ptr = ptr->next) {
++    entry = list_entry(ptr, struct ring_element, list);
++    kfree(entry);
++  }
++
++  while(ring_cluster_list != NULL) {
++    struct ring_cluster *next = ring_cluster_list->next;
++    kfree(ring_cluster_list);
++    ring_cluster_list = next;
++  }
++
++  set_skb_ring_handler(NULL);
++  set_buffer_ring_handler(NULL);
++  sock_unregister(PF_RING);
++
++  printk("PF_RING shut down.\n");
++}
++
++/* ************************************ */
++
++static int __init ring_init(void)
++{
++  printk("Welcome to PF_RING %s\n(C) 2004-05 L.Deri <deri@ntop.org>\n",
++	 RING_VERSION);
++
++  INIT_LIST_HEAD(&ring_table);
++  ring_cluster_list = NULL;
++
++  sock_register(&ring_family_ops);
++
++  set_skb_ring_handler(skb_ring_handler);
++  set_buffer_ring_handler(buffer_ring_handler);
++
++  if(get_buffer_ring_handler() != buffer_ring_handler) {
++    printk("PF_RING: set_buffer_ring_handler FAILED\n");
++
++    set_skb_ring_handler(NULL);
++    set_buffer_ring_handler(NULL);
++    sock_unregister(PF_RING);
++    return -1;
++  } else {
++    printk("PF_RING: bucket length    %d bytes\n", bucket_len);
++    printk("PF_RING: ring slots       %d\n", num_slots);
++    printk("PF_RING: sample rate      %d [1=no sampling]\n", sample_rate);
++    printk("PF_RING: capture TX       %s\n",
++	   enable_tx_capture ? "Yes [RX+TX]" : "No [RX only]");
++    printk("PF_RING: transparent mode %s\n",
++	   transparent_mode ? "Yes" : "No");
++
++    printk("PF_RING initialized correctly.\n");
++    return 0;
++  }
++}
++
++module_init(ring_init);
++module_exit(ring_exit);
++MODULE_LICENSE("GPL");
++
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0))
++MODULE_ALIAS_NETPROTO(PF_RING);
++#endif