/*
 * INET         An implementation of the TCP/IP protocol suite for the LINUX
 *              operating system.  INET is implemented using the  BSD Socket
 *              interface as the means of communication with the user level.
 *
 *              PACKET - implements raw packet sockets.
 *
 * Authors:     Ross Biro
 *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 *
 * Fixes:
 *              Alan Cox        :       verify_area() now used correctly
 *              Alan Cox        :       new skbuff lists, look ma no backlogs!
 *              Alan Cox        :       tidied skbuff lists.
 *              Alan Cox        :       Now uses generic datagram routines I
 *                                      added. Also fixed the peek/read crash
 *                                      from all old Linux datagram code.
 *              Alan Cox        :       Uses the improved datagram code.
 *              Alan Cox        :       Added NULL's for socket options.
 *              Alan Cox        :       Re-commented the code.
 *              Alan Cox        :       Use new kernel side addressing
 *              Rob Janssen     :       Correct MTU usage.
 *              Dave Platt      :       Counter leaks caused by incorrect
 *                                      interrupt locking and some slightly
 *                                      dubious gcc output. Can you read
 *                                      compiler: it said _VOLATILE_
 *      Richard Kooijman        :       Timestamp fixes.
 *              Alan Cox        :       New buffers. Use sk->mac.raw.
 *              Alan Cox        :       sendmsg/recvmsg support.
 *              Alan Cox        :       Protocol setting support
 *      Alexey Kuznetsov        :       Untied from IPv4 stack.
 *      Cyrus Durgin            :       Fixed kerneld for kmod.
 *      Michal Ostrowski        :       Module initialization cleanup.
 *         Ulises Alonso        :       Frame number limit removal and
 *                                      packet_set_ring memory leak.
 *              Eric Biederman  :       Allow for > 8 byte hardware addresses.
 *                                      The convention is that longer addresses
 *                                      will simply extend the hardware address
 *                                      byte arrays at the end of sockaddr_ll
 *                                      and packet_mreq.
 *              Johann Baudy    :       Added TX RING.
 *              Chetan Loke     :       Implemented TPACKET_V3 block abstraction
 *                                      layer.
 *                                      Copyright (C) 2011, <lokec@ccs.neu.edu>
 *
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 */

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/capability.h>
#include <linux/fcntl.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_packet.h>
#include <linux/wireless.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/ioctls.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <asm/io.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/poll.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/if_vlan.h>
#include <linux/virtio_net.h>
#include <linux/errqueue.h>
#include <linux/net_tstamp.h>

#ifdef CONFIG_INET
#include <net/inet_common.h>
#endif

/*
   Assumptions:
   - if device has no dev->hard_header routine, it adds and removes ll header
     inside itself. In this case ll header is invisible outside of device,
     but higher levels still should reserve dev->hard_header_len.
     Some devices are enough clever to reallocate skb, when header
     will not fit to reserved space (tunnel), another ones are silly
     (PPP).
   - packet socket receives packets with pulled ll header,
     so that SOCK_RAW should push it back.

On receive:
-----------

Incoming, dev->hard_header!=NULL
   mac_header -> ll header
   data       -> data

Outgoing, dev->hard_header!=NULL
   mac_header -> ll header
   data       -> ll header

Incoming, dev->hard_header==NULL
   mac_header -> UNKNOWN position. It is very likely, that it points to ll
                 header.  PPP makes it, that is wrong, because introduce
                 assymetry between rx and tx paths.
   data       -> data

Outgoing, dev->hard_header==NULL
   mac_header -> data. ll header is still not built!
   data       -> data

Resume
  If dev->hard_header==NULL we are unlikely to restore sensible ll header.


On transmit:
------------

dev->hard_header != NULL
   mac_header -> ll header
   data       -> ll header

dev->hard_header == NULL (ll header is added by device, we cannot control it)
   mac_header -> data
   data       -> data

   We should set nh.raw on output to correct posistion,
   packet classifier depends on it.
 */

/* Private packet socket structures. */

struct packet_mclist {
        struct packet_mclist    *next;
        int                     ifindex;
        int                     count;
        unsigned short          type;
        unsigned short          alen;
        unsigned char           addr[MAX_ADDR_LEN];
};
/* identical to struct packet_mreq except it has
 * a longer address field.
 */
struct packet_mreq_max {
        int             mr_ifindex;
        unsigned short  mr_type;
        unsigned short  mr_alen;
        unsigned char   mr_address[MAX_ADDR_LEN];
};

static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
                int closing, int tx_ring);


#define V3_ALIGNMENT    (8)

#define BLK_HDR_LEN     (ALIGN(sizeof(struct tpacket_block_desc), V3_ALIGNMENT))

#define BLK_PLUS_PRIV(sz_of_priv) \
        (BLK_HDR_LEN + ALIGN((sz_of_priv), V3_ALIGNMENT))

/* kbdq - kernel block descriptor queue */
struct tpacket_kbdq_core {
        struct pgv      *pkbdq;
        unsigned int    feature_req_word;
        unsigned int    hdrlen;
        unsigned char   reset_pending_on_curr_blk;
        unsigned char   delete_blk_timer;
        unsigned short  kactive_blk_num;
        unsigned short  blk_sizeof_priv;

        /* last_kactive_blk_num:
         * trick to see if user-space has caught up
         * in order to avoid refreshing timer when every single pkt arrives.
         */
        unsigned short  last_kactive_blk_num;

        char            *pkblk_start;
        char            *pkblk_end;
        int             kblk_size;
        unsigned int    knum_blocks;
        uint64_t        knxt_seq_num;
        char            *prev;
        char            *nxt_offset;
        struct sk_buff  *skb;

        atomic_t        blk_fill_in_prog;

        /* Default is set to 8ms */
#define DEFAULT_PRB_RETIRE_TOV  (8)

        unsigned short  retire_blk_tov;
        unsigned short  version;
        unsigned long   tov_in_jiffies;

        /* timer to retire an outstanding block */
        struct timer_list retire_blk_timer;
};

#define PGV_FROM_VMALLOC 1
struct pgv {
        char *buffer;
};

struct packet_ring_buffer {
        struct pgv              *pg_vec;
        unsigned int            head;
        unsigned int            frames_per_block;
        unsigned int            frame_size;
        unsigned int            frame_max;

        unsigned int            pg_vec_order;
        unsigned int            pg_vec_pages;
        unsigned int            pg_vec_len;

        struct tpacket_kbdq_core        prb_bdqc;
        atomic_t                pending;
};

#define BLOCK_STATUS(x) ((x)->hdr.bh1.block_status)
#define BLOCK_NUM_PKTS(x)       ((x)->hdr.bh1.num_pkts)
#define BLOCK_O2FP(x)           ((x)->hdr.bh1.offset_to_first_pkt)
#define BLOCK_LEN(x)            ((x)->hdr.bh1.blk_len)
#define BLOCK_SNUM(x)           ((x)->hdr.bh1.seq_num)
#define BLOCK_O2PRIV(x) ((x)->offset_to_priv)
#define BLOCK_PRIV(x)           ((void *)((char *)(x) + BLOCK_O2PRIV(x)))

struct packet_sock;
static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);

static void *packet_previous_frame(struct packet_sock *po,
                struct packet_ring_buffer *rb,
                int status);
static void packet_increment_head(struct packet_ring_buffer *buff);
static int prb_curr_blk_in_use(struct tpacket_kbdq_core *,
                        struct tpacket_block_desc *);
static void *prb_dispatch_next_block(struct tpacket_kbdq_core *,
                        struct packet_sock *);
static void prb_retire_current_block(struct tpacket_kbdq_core *,
                struct packet_sock *, unsigned int status);
static int prb_queue_frozen(struct tpacket_kbdq_core *);
static void prb_open_block(struct tpacket_kbdq_core *,
                struct tpacket_block_desc *);
static void prb_retire_rx_blk_timer_expired(unsigned long);
static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *);
static void prb_init_blk_timer(struct packet_sock *,
                struct tpacket_kbdq_core *,
                void (*func) (unsigned long));
static void prb_fill_rxhash(struct tpacket_kbdq_core *, struct tpacket3_hdr *);
static void prb_clear_rxhash(struct tpacket_kbdq_core *,
                struct tpacket3_hdr *);
static void prb_fill_vlan_info(struct tpacket_kbdq_core *,
                struct tpacket3_hdr *);
static void packet_flush_mclist(struct sock *sk);

struct packet_fanout;
struct packet_sock {
        /* struct sock has to be the first member of packet_sock */
        struct sock             sk;
        struct packet_fanout    *fanout;
        struct tpacket_stats    stats;
        union  tpacket_stats_u  stats_u;
        struct packet_ring_buffer       rx_ring;
        struct packet_ring_buffer       tx_ring;
        int                     copy_thresh;
        spinlock_t              bind_lock;
        struct mutex            pg_vec_lock;
        unsigned int            running:1,      /* prot_hook is attached*/
                                auxdata:1,
                                origdev:1,
                                has_vnet_hdr:1;
        int                     ifindex;        /* bound device         */
        __be16                  num;
        struct packet_mclist    *mclist;
        atomic_t                mapped;
        enum tpacket_versions   tp_version;
        unsigned int            tp_hdrlen;
        unsigned int            tp_reserve;
        unsigned int            tp_loss:1;
        unsigned int            tp_tstamp;
        struct packet_type      prot_hook ____cacheline_aligned_in_smp;
};

#define PACKET_FANOUT_MAX       256

struct packet_fanout {
#ifdef CONFIG_NET_NS
        struct net              *net;
#endif
        unsigned int            num_members;
        u16                     id;
        u8                      type;
        u8                      defrag;
        atomic_t                rr_cur;
        struct list_head        list;
        struct sock             *arr[PACKET_FANOUT_MAX];
        spinlock_t              lock;
        atomic_t                sk_ref;
        struct packet_type      prot_hook ____cacheline_aligned_in_smp;
};

struct packet_skb_cb {
        unsigned int origlen;
        union {
                struct sockaddr_pkt pkt;
                struct sockaddr_ll ll;
        } sa;
};

#define PACKET_SKB_CB(__skb)    ((struct packet_skb_cb *)((__skb)->cb))

#define GET_PBDQC_FROM_RB(x)    ((struct tpacket_kbdq_core *)(&(x)->prb_bdqc))
#define GET_PBLOCK_DESC(x, bid) \
        ((struct tpacket_block_desc *)((x)->pkbdq[(bid)].buffer))
#define GET_CURR_PBLOCK_DESC_FROM_CORE(x)       \
        ((struct tpacket_block_desc *)((x)->pkbdq[(x)->kactive_blk_num].buffer))
#define GET_NEXT_PRB_BLK_NUM(x) \
        (((x)->kactive_blk_num < ((x)->knum_blocks-1)) ? \
        ((x)->kactive_blk_num+1) : 0)

static struct packet_sock *pkt_sk(struct sock *sk)
{
        return (struct packet_sock *)sk;
}

static void __fanout_unlink(struct sock *sk, struct packet_sock *po);
static void __fanout_link(struct sock *sk, struct packet_sock *po);

/* register_prot_hook must be invoked with the po->bind_lock held,
 * or from a context in which asynchronous accesses to the packet
 * socket is not possible (packet_create()).
 */
static void register_prot_hook(struct sock *sk)
{
        struct packet_sock *po = pkt_sk(sk);
        if (!po->running) {
                if (po->fanout)
                        __fanout_link(sk, po);
                else
                        dev_add_pack(&po->prot_hook);
                sock_hold(sk);
                po->running = 1;
        }
}

/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
 * held.   If the sync parameter is true, we will temporarily drop
 * the po->bind_lock and do a synchronize_net to make sure no
 * asynchronous packet processing paths still refer to the elements
 * of po->prot_hook.  If the sync parameter is false, it is the
 * callers responsibility to take care of this.
 */
static void __unregister_prot_hook(struct sock *sk, bool sync)
{
        struct packet_sock *po = pkt_sk(sk);

        po->running = 0;
        if (po->fanout)
                __fanout_unlink(sk, po);
        else
                __dev_remove_pack(&po->prot_hook);
        __sock_put(sk);

        if (sync) {
                spin_unlock(&po->bind_lock);
                synchronize_net();
                spin_lock(&po->bind_lock);
        }
}

static void unregister_prot_hook(struct sock *sk, bool sync)
{
        struct packet_sock *po = pkt_sk(sk);

        if (po->running)
                __unregister_prot_hook(sk, sync);
}

static inline __pure struct page *pgv_to_page(void *addr)
{
        if (is_vmalloc_addr(addr))
                return vmalloc_to_page(addr);
        return virt_to_page(addr);
}

static void __packet_set_status(struct packet_sock *po, void *frame, int status)
{
        union {
                struct tpacket_hdr *h1;
                struct tpacket2_hdr *h2;
                void *raw;
        } h;

        h.raw = frame;
        switch (po->tp_version) {
        case TPACKET_V1:
                h.h1->tp_status = status;
                flush_dcache_page(pgv_to_page(&h.h1->tp_status));
                break;
        case TPACKET_V2:
                h.h2->tp_status = status;
                flush_dcache_page(pgv_to_page(&h.h2->tp_status));
                break;
        case TPACKET_V3:
        default:
                WARN(1, "TPACKET version not supported.\n");
                BUG();
        }

        smp_wmb();
}

static int __packet_get_status(struct packet_sock *po, void *frame)
{
        union {
                struct tpacket_hdr *h1;
                struct tpacket2_hdr *h2;
                void *raw;
        } h;

        smp_rmb();

        h.raw = frame;
        switch (po->tp_version) {
        case TPACKET_V1:
                flush_dcache_page(pgv_to_page(&h.h1->tp_status));
                return h.h1->tp_status;
        case TPACKET_V2:
                flush_dcache_page(pgv_to_page(&h.h2->tp_status));
                return h.h2->tp_status;
        case TPACKET_V3:
        default:
                WARN(1, "TPACKET version not supported.\n");
                BUG();
                return 0;
        }
}

static void *packet_lookup_frame(struct packet_sock *po,
                struct packet_ring_buffer *rb,
                unsigned int position,
                int status)
{
        unsigned int pg_vec_pos, frame_offset;
        union {
                struct tpacket_hdr *h1;
                struct tpacket2_hdr *h2;
                void *raw;
        } h;

        pg_vec_pos = position / rb->frames_per_block;
        frame_offset = position % rb->frames_per_block;

        h.raw = rb->pg_vec[pg_vec_pos].buffer +
                (frame_offset * rb->frame_size);

        if (status != __packet_get_status(po, h.raw))
                return NULL;

        return h.raw;
}

static void *packet_current_frame(struct packet_sock *po,
                struct packet_ring_buffer *rb,
                int status)
{
        return packet_lookup_frame(po, rb, rb->head, status);
}

static void prb_del_retire_blk_timer(struct tpacket_kbdq_core *pkc)
{
        del_timer_sync(&pkc->retire_blk_timer);
}

static void prb_shutdown_retire_blk_timer(struct packet_sock *po,
                int tx_ring,
                struct sk_buff_head *rb_queue)
{
        struct tpacket_kbdq_core *pkc;

        pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;

        spin_lock(&rb_queue->lock);
        pkc->delete_blk_timer = 1;
        spin_unlock(&rb_queue->lock);

        prb_del_retire_blk_timer(pkc);
}

static void prb_init_blk_timer(struct packet_sock *po,
                struct tpacket_kbdq_core *pkc,
                void (*func) (unsigned long))
{
        init_timer(&pkc->retire_blk_timer);
        pkc->retire_blk_timer.data = (long)po;
        pkc->retire_blk_timer.function = func;
        pkc->retire_blk_timer.expires = jiffies;
}

static void prb_setup_retire_blk_timer(struct packet_sock *po, int tx_ring)
{
        struct tpacket_kbdq_core *pkc;

        if (tx_ring)
                BUG();

        pkc = tx_ring ? &po->tx_ring.prb_bdqc : &po->rx_ring.prb_bdqc;
        prb_init_blk_timer(po, pkc, prb_retire_rx_blk_timer_expired);
}

static int prb_calc_retire_blk_tmo(struct packet_sock *po,
                                int blk_size_in_bytes)
{
        struct net_device *dev;
        unsigned int mbits = 0, msec = 0, div = 0, tmo = 0;
        struct ethtool_cmd ecmd;
        int err;

        rtnl_lock();
        dev = __dev_get_by_index(sock_net(&po->sk), po->ifindex);
        if (unlikely(!dev)) {
                rtnl_unlock();
                return DEFAULT_PRB_RETIRE_TOV;
        }
        err = __ethtool_get_settings(dev, &ecmd);
        rtnl_unlock();
        if (!err) {
                switch (ecmd.speed) {
                case SPEED_10000:
                        msec = 1;
                        div = 10000/1000;
                        break;
                case SPEED_1000:
                        msec = 1;
                        div = 1000/1000;
                        break;
                /*
                 * If the link speed is so slow you don't really
                 * need to worry about perf anyways
                 */
                case SPEED_100:
                case SPEED_10:
                default:
                        return DEFAULT_PRB_RETIRE_TOV;
                }
        }

        mbits = (blk_size_in_bytes * 8) / (1024 * 1024);

        if (div)
                mbits /= div;

        tmo = mbits * msec;

        if (div)
                return tmo+1;
        return tmo;
}

static void prb_init_ft_ops(struct tpacket_kbdq_core *p1,
                        union tpacket_req_u *req_u)
{
        p1->feature_req_word = req_u->req3.tp_feature_req_word;
}

static void init_prb_bdqc(struct packet_sock *po,
                        struct packet_ring_buffer *rb,
                        struct pgv *pg_vec,
                        union tpacket_req_u *req_u, int tx_ring)
{
        struct tpacket_kbdq_core *p1 = &rb->prb_bdqc;
        struct tpacket_block_desc *pbd;

        memset(p1, 0x0, sizeof(*p1));

        p1->knxt_seq_num = 1;
        p1->pkbdq = pg_vec;
        pbd = (struct tpacket_block_desc *)pg_vec[0].buffer;
        p1->pkblk_start = (char *)pg_vec[0].buffer;
        p1->kblk_size = req_u->req3.tp_block_size;
        p1->knum_blocks = req_u->req3.tp_block_nr;
        p1->hdrlen = po->tp_hdrlen;
        p1->version = po->tp_version;
        p1->last_kactive_blk_num = 0;
        po->stats_u.stats3.tp_freeze_q_cnt = 0;
        if (req_u->req3.tp_retire_blk_tov)
                p1->retire_blk_tov = req_u->req3.tp_retire_blk_tov;
        else
                p1->retire_blk_tov = prb_calc_retire_blk_tmo(po,
                                                req_u->req3.tp_block_size);
        p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
        p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;

        prb_init_ft_ops(p1, req_u);
        prb_setup_retire_blk_timer(po, tx_ring);
        prb_open_block(p1, pbd);
}

/*  Do NOT update the last_blk_num first.
 *  Assumes sk_buff_head lock is held.
 */
static void _prb_refresh_rx_retire_blk_timer(struct tpacket_kbdq_core *pkc)
{
        mod_timer(&pkc->retire_blk_timer,
                        jiffies + pkc->tov_in_jiffies);
        pkc->last_kactive_blk_num = pkc->kactive_blk_num;
}

/*
 * Timer logic:
 * 1) We refresh the timer only when we open a block.
 *    By doing this we don't waste cycles refreshing the timer
 *        on packet-by-packet basis.
 *
 * With a 1MB block-size, on a 1Gbps line, it will take
 * i) ~8 ms to fill a block + ii) memcpy etc.
 * In this cut we are not accounting for the memcpy time.
 *
 * So, if the user sets the 'tmo' to 10ms then the timer
 * will never fire while the block is still getting filled
 * (which is what we want). However, the user could choose
 * to close a block early and that's fine.
 *
 * But when the timer does fire, we check whether or not to refresh it.
 * Since the tmo granularity is in msecs, it is not too expensive
 * to refresh the timer, lets say every '8' msecs.
 * Either the user can set the 'tmo' or we can derive it based on
 * a) line-speed and b) block-size.
 * prb_calc_retire_blk_tmo() calculates the tmo.
 *
 */
static void prb_retire_rx_blk_timer_expired(unsigned long data)
{
        struct packet_sock *po = (struct packet_sock *)data;
        struct tpacket_kbdq_core *pkc = &po->rx_ring.prb_bdqc;
        unsigned int frozen;
        struct tpacket_block_desc *pbd;

        spin_lock(&po->sk.sk_receive_queue.lock);

        frozen = prb_queue_frozen(pkc);
        pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);

        if (unlikely(pkc->delete_blk_timer))
                goto out;

        /* We only need to plug the race when the block is partially filled.
         * tpacket_rcv:
         *              lock(); increment BLOCK_NUM_PKTS; unlock()
         *              copy_bits() is in progress ...
         *              timer fires on other cpu:
         *              we can't retire the current block because copy_bits
         *              is in progress.
         *
         */
        if (BLOCK_NUM_PKTS(pbd)) {
                while (atomic_read(&pkc->blk_fill_in_prog)) {
                        /* Waiting for skb_copy_bits to finish... */
                        cpu_relax();
                }
        }

        if (pkc->last_kactive_blk_num == pkc->kactive_blk_num) {
                if (!frozen) {
                        prb_retire_current_block(pkc, po, TP_STATUS_BLK_TMO);
                        if (!prb_dispatch_next_block(pkc, po))
                                goto refresh_timer;
                        else
                                goto out;
                } else {
                        /* Case 1. Queue was frozen because user-space was
                         *         lagging behind.
                         */
                        if (prb_curr_blk_in_use(pkc, pbd)) {
                                /*
                                 * Ok, user-space is still behind.
                                 * So just refresh the timer.
                                 */
                                goto refresh_timer;
                        } else {
                               /* Case 2. queue was frozen,user-space caught up,
                                * now the link went idle && the timer fired.
                                * We don't have a block to close.So we open this
                                * block and restart the timer.
                                * opening a block thaws the queue,restarts timer
                                * Thawing/timer-refresh is a side effect.
                                */
                                prb_open_block(pkc, pbd);
                                goto out;
                        }
                }
        }

refresh_timer:
        _prb_refresh_rx_retire_blk_timer(pkc);

out:
        spin_unlock(&po->sk.sk_receive_queue.lock);
}

static void prb_flush_block(struct tpacket_kbdq_core *pkc1,
                struct tpacket_block_desc *pbd1, __u32 status)
{
        /* Flush everything minus the block header */

#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
        u8 *start, *end;

        start = (u8 *)pbd1;

        /* Skip the block header(we know header WILL fit in 4K) */
        start += PAGE_SIZE;

        end = (u8 *)PAGE_ALIGN((unsigned long)pkc1->pkblk_end);
        for (; start < end; start += PAGE_SIZE)
                flush_dcache_page(pgv_to_page(start));

        smp_wmb();
#endif

        /* Now update the block status. */

        BLOCK_STATUS(pbd1) = status;

        /* Flush the block header */

#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
        start = (u8 *)pbd1;
        flush_dcache_page(pgv_to_page(start));

        smp_wmb();
#endif
}

/*
 * Side effect:
 *
 * 1) flush the block
 * 2) Increment active_blk_num
 *
 * Note:We DONT refresh the timer on purpose.
 *      Because almost always the next block will be opened.
 */
static void prb_close_block(struct tpacket_kbdq_core *pkc1,
                struct tpacket_block_desc *pbd1,
                struct packet_sock *po, unsigned int stat)
{
        __u32 status = TP_STATUS_USER | stat;

        struct tpacket3_hdr *last_pkt;
        struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;

        if (po->stats.tp_drops)
                status |= TP_STATUS_LOSING;

        last_pkt = (struct tpacket3_hdr *)pkc1->prev;
        last_pkt->tp_next_offset = 0;

        /* Get the ts of the last pkt */
        if (BLOCK_NUM_PKTS(pbd1)) {
                h1->ts_last_pkt.ts_sec = last_pkt->tp_sec;
                h1->ts_last_pkt.ts_nsec = last_pkt->tp_nsec;
        } else {
                /* Ok, we tmo'd - so get the current time */
                struct timespec ts;
                getnstimeofday(&ts);
                h1->ts_last_pkt.ts_sec = ts.tv_sec;
                h1->ts_last_pkt.ts_nsec = ts.tv_nsec;
        }

        smp_wmb();

        /* Flush the block */
        prb_flush_block(pkc1, pbd1, status);

        pkc1->kactive_blk_num = GET_NEXT_PRB_BLK_NUM(pkc1);
}

static void prb_thaw_queue(struct tpacket_kbdq_core *pkc)
{
        pkc->reset_pending_on_curr_blk = 0;
}

/*
 * Side effect of opening a block:
 *
 * 1) prb_queue is thawed.
 * 2) retire_blk_timer is refreshed.
 *
 */
static void prb_open_block(struct tpacket_kbdq_core *pkc1,
        struct tpacket_block_desc *pbd1)
{
        struct timespec ts;
        struct tpacket_hdr_v1 *h1 = &pbd1->hdr.bh1;

        smp_rmb();

        if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd1))) {

                /* We could have just memset this but we will lose the
                 * flexibility of making the priv area sticky
                 */
                BLOCK_SNUM(pbd1) = pkc1->knxt_seq_num++;
                BLOCK_NUM_PKTS(pbd1) = 0;
                BLOCK_LEN(pbd1) = BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
                getnstimeofday(&ts);
                h1->ts_first_pkt.ts_sec = ts.tv_sec;
                h1->ts_first_pkt.ts_nsec = ts.tv_nsec;
                pkc1->pkblk_start = (char *)pbd1;
                pkc1->nxt_offset = (char *)(pkc1->pkblk_start +
                BLK_PLUS_PRIV(pkc1->blk_sizeof_priv));
                BLOCK_O2FP(pbd1) = (__u32)BLK_PLUS_PRIV(pkc1->blk_sizeof_priv);
                BLOCK_O2PRIV(pbd1) = BLK_HDR_LEN;
                pbd1->version = pkc1->version;
                pkc1->prev = pkc1->nxt_offset;
                pkc1->pkblk_end = pkc1->pkblk_start + pkc1->kblk_size;
                prb_thaw_queue(pkc1);
                _prb_refresh_rx_retire_blk_timer(pkc1);

                smp_wmb();

                return;
        }

        WARN(1, "ERROR block:%p is NOT FREE status:%d kactive_blk_num:%d\n",
                pbd1, BLOCK_STATUS(pbd1), pkc1->kactive_blk_num);
        dump_stack();
        BUG();
}

/*
 * Queue freeze logic:
 * 1) Assume tp_block_nr = 8 blocks.
 * 2) At time 't0', user opens Rx ring.
 * 3) Some time past 't0', kernel starts filling blocks starting from 0 .. 7
 * 4) user-space is either sleeping or processing block '0'.
 * 5) tpacket_rcv is currently filling block '7', since there is no space left,
 *    it will close block-7,loop around and try to fill block '0'.
 *    call-flow:
 *    __packet_lookup_frame_in_block
 *      prb_retire_current_block()
 *      prb_dispatch_next_block()
 *        |->(BLOCK_STATUS == USER) evaluates to true
 *    5.1) Since block-0 is currently in-use, we just freeze the queue.
 * 6) Now there are two cases:
 *    6.1) Link goes idle right after the queue is frozen.
 *         But remember, the last open_block() refreshed the timer.
 *         When this timer expires,it will refresh itself so that we can
 *         re-open block-0 in near future.
 *    6.2) Link is busy and keeps on receiving packets. This is a simple
 *         case and __packet_lookup_frame_in_block will check if block-0
 *         is free and can now be re-used.
 */
static void prb_freeze_queue(struct tpacket_kbdq_core *pkc,
                                  struct packet_sock *po)
{
        pkc->reset_pending_on_curr_blk = 1;
        po->stats_u.stats3.tp_freeze_q_cnt++;
}

#define TOTAL_PKT_LEN_INCL_ALIGN(length) (ALIGN((length), V3_ALIGNMENT))

/*
 * If the next block is free then we will dispatch it
 * and return a good offset.
 * Else, we will freeze the queue.
 * So, caller must check the return value.
 */
static void *prb_dispatch_next_block(struct tpacket_kbdq_core *pkc,
                struct packet_sock *po)
{
        struct tpacket_block_desc *pbd;

        smp_rmb();

        /* 1. Get current block num */
        pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);

        /* 2. If this block is currently in_use then freeze the queue */
        if (TP_STATUS_USER & BLOCK_STATUS(pbd)) {
                prb_freeze_queue(pkc, po);
                return NULL;
        }

        /*
         * 3.
         * open this block and return the offset where the first packet
         * needs to get stored.
         */
        prb_open_block(pkc, pbd);
        return (void *)pkc->nxt_offset;
}

static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
                struct packet_sock *po, unsigned int status)
{
        struct tpacket_block_desc *pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);

        /* retire/close the current block */
        if (likely(TP_STATUS_KERNEL == BLOCK_STATUS(pbd))) {
                /*
                 * Plug the case where copy_bits() is in progress on
                 * cpu-0 and tpacket_rcv() got invoked on cpu-1, didn't
                 * have space to copy the pkt in the current block and
                 * called prb_retire_current_block()
                 *
                 * We don't need to worry about the TMO case because
                 * the timer-handler already handled this case.
                 */
                if (!(status & TP_STATUS_BLK_TMO)) {
                        while (atomic_read(&pkc->blk_fill_in_prog)) {
                                /* Waiting for skb_copy_bits to finish... */
                                cpu_relax();
                        }
                }
                prb_close_block(pkc, pbd, po, status);
                return;
        }

        WARN(1, "ERROR-pbd[%d]:%p\n", pkc->kactive_blk_num, pbd);
        dump_stack();
        BUG();
}

static int prb_curr_blk_in_use(struct tpacket_kbdq_core *pkc,
                                      struct tpacket_block_desc *pbd)
{
        return TP_STATUS_USER & BLOCK_STATUS(pbd);
}

static int prb_queue_frozen(struct tpacket_kbdq_core *pkc)
{
        return pkc->reset_pending_on_curr_blk;
}

static void prb_clear_blk_fill_status(struct packet_ring_buffer *rb)
{
        struct tpacket_kbdq_core *pkc  = GET_PBDQC_FROM_RB(rb);
        atomic_dec(&pkc->blk_fill_in_prog);
}

static void prb_fill_rxhash(struct tpacket_kbdq_core *pkc,
                        struct tpacket3_hdr *ppd)
{
        ppd->hv1.tp_rxhash = skb_get_rxhash(pkc->skb);
}

static void prb_clear_rxhash(struct tpacket_kbdq_core *pkc,
                        struct tpacket3_hdr *ppd)
{
        ppd->hv1.tp_rxhash = 0;
}

static void prb_fill_vlan_info(struct tpacket_kbdq_core *pkc,
                        struct tpacket3_hdr *ppd)
{
        if (vlan_tx_tag_present(pkc->skb)) {
                ppd->hv1.tp_vlan_tci = vlan_tx_tag_get(pkc->skb);
                ppd->tp_status = TP_STATUS_VLAN_VALID;
        } else {
                ppd->hv1.tp_vlan_tci = ppd->tp_status = 0;
        }
}

static void prb_run_all_ft_ops(struct tpacket_kbdq_core *pkc,
                        struct tpacket3_hdr *ppd)
{
        prb_fill_vlan_info(pkc, ppd);

        if (pkc->feature_req_word & TP_FT_REQ_FILL_RXHASH)
                prb_fill_rxhash(pkc, ppd);
        else
                prb_clear_rxhash(pkc, ppd);
}

static void prb_fill_curr_block(char *curr,
                                struct tpacket_kbdq_core *pkc,
                                struct tpacket_block_desc *pbd,
                                unsigned int len)
{
        struct tpacket3_hdr *ppd;

        ppd  = (struct tpacket3_hdr *)curr;
        ppd->tp_next_offset = TOTAL_PKT_LEN_INCL_ALIGN(len);
        pkc->prev = curr;
        pkc->nxt_offset += TOTAL_PKT_LEN_INCL_ALIGN(len);
        BLOCK_LEN(pbd) += TOTAL_PKT_LEN_INCL_ALIGN(len);
        BLOCK_NUM_PKTS(pbd) += 1;
        atomic_inc(&pkc->blk_fill_in_prog);
        prb_run_all_ft_ops(pkc, ppd);
}

/* Assumes caller has the sk->rx_queue.lock */
static void *__packet_lookup_frame_in_block(struct packet_sock *po,
                                            struct sk_buff *skb,
                                                int status,
                                            unsigned int len
                                            )
{
        struct tpacket_kbdq_core *pkc;
        struct tpacket_block_desc *pbd;
        char *curr, *end;

        pkc = GET_PBDQC_FROM_RB(((struct packet_ring_buffer *)&po->rx_ring));
        pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);

        /* Queue is frozen when user space is lagging behind */
        if (prb_queue_frozen(pkc)) {
                /*
                 * Check if that last block which caused the queue to freeze,
                 * is still in_use by user-space.
                 */
                if (prb_curr_blk_in_use(pkc, pbd)) {
                        /* Can't record this packet */
                        return NULL;
                } else {
                        /*
                         * Ok, the block was released by user-space.
                         * Now let's open that block.
                         * opening a block also thaws the queue.
                         * Thawing is a side effect.
                         */
                        prb_open_block(pkc, pbd);
                }
        }

        smp_mb();
        curr = pkc->nxt_offset;
        pkc->skb = skb;
        end = (char *) ((char *)pbd + pkc->kblk_size);

        /* first try the current block */
        if (curr+TOTAL_PKT_LEN_INCL_ALIGN(len) < end) {
                prb_fill_curr_block(curr, pkc, pbd, len);
                return (void *)curr;
        }

        /* Ok, close the current block */
        prb_retire_current_block(pkc, po, 0);

        /* Now, try to dispatch the next block */
        curr = (char *)prb_dispatch_next_block(pkc, po);
        if (curr) {
                pbd = GET_CURR_PBLOCK_DESC_FROM_CORE(pkc);
                prb_fill_curr_block(curr, pkc, pbd, len);
                return (void *)curr;
        }

        /*
         * No free blocks are available.user_space hasn't caught up yet.
         * Queue was just frozen and now this packet will get dropped.
         */
        return NULL;
}

static void *packet_current_rx_frame(struct packet_sock *po,
                                            struct sk_buff *skb,
                                            int status, unsigned int len)
{
        char *curr = NULL;
        switch (po->tp_version) {
        case TPACKET_V1:
        case TPACKET_V2:
                curr = packet_lookup_frame(po, &po->rx_ring,
                                        po->rx_ring.head, status);
                return curr;
        case TPACKET_V3:
                return __packet_lookup_frame_in_block(po, skb, status, len);
        default:
                WARN(1, "TPACKET version not supported\n");
                BUG();
                return 0;
        }
}

static void *prb_lookup_block(struct packet_sock *po,
                                     struct packet_ring_buffer *rb,
                                     unsigned int previous,
                                     int status)
{
        struct tpacket_kbdq_core *pkc  = GET_PBDQC_FROM_RB(rb);
        struct tpacket_block_desc *pbd = GET_PBLOCK_DESC(pkc, previous);

        if (status != BLOCK_STATUS(pbd))
                return NULL;
        return pbd;
}

static int prb_previous_blk_num(struct packet_ring_buffer *rb)
{
        unsigned int prev;
        if (rb->prb_bdqc.kactive_blk_num)
                prev = rb->prb_bdqc.kactive_blk_num-1;
        else
                prev = rb->prb_bdqc.knum_blocks-1;
        return prev;
}

/* Assumes caller has held the rx_queue.lock */
static void *__prb_previous_block(struct packet_sock *po,
                                         struct packet_ring_buffer *rb,
                                         int status)
{
        unsigned int previous = prb_previous_blk_num(rb);
        return prb_lookup_block(po, rb, previous, status);
}

static void *packet_previous_rx_frame(struct packet_sock *po,
                                             struct packet_ring_buffer *rb,
                                             int status)
{
        if (po->tp_version <= TPACKET_V2)
                return packet_previous_frame(po, rb, status);

        return __prb_previous_block(po, rb, status);
}

static void packet_increment_rx_head(struct packet_sock *po,
                                            struct packet_ring_buffer *rb)
{
        switch (po->tp_version) {
        case TPACKET_V1:
        case TPACKET_V2:
                return packet_increment_head(rb);
        case TPACKET_V3:
        default:
                WARN(1, "TPACKET version not supported.\n");
                BUG();
                return;
        }
}

static void *packet_previous_frame(struct packet_sock *po,
                struct packet_ring_buffer *rb,
                int status)
{
        unsigned int previous = rb->head ? rb->head - 1 : rb->frame_max;
        return packet_lookup_frame(po, rb, previous, status);
}

static void packet_increment_head(struct packet_ring_buffer *buff)
{
        buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;
}

static void packet_sock_destruct(struct sock *sk)
{
        skb_queue_purge(&sk->sk_error_queue);

        WARN_ON(atomic_read(&sk->sk_rmem_alloc));
        WARN_ON(atomic_read(&sk->sk_wmem_alloc));

        if (!sock_flag(sk, SOCK_DEAD)) {
                pr_err("Attempt to release alive packet socket: %p\n", sk);
                return;
        }

        sk_refcnt_debug_dec(sk);
}

static int fanout_rr_next(struct packet_fanout *f, unsigned int num)
{
        int x = atomic_read(&f->rr_cur) + 1;

        if (x >= num)
                x = 0;

        return x;
}

static struct sock *fanout_demux_hash(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
{
        u32 idx, hash = skb->rxhash;

        idx = ((u64)hash * num) >> 32;

        return f->arr[idx];
}

static struct sock *fanout_demux_lb(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
{
        int cur, old;

        cur = atomic_read(&f->rr_cur);
        while ((old = atomic_cmpxchg(&f->rr_cur, cur,
                                     fanout_rr_next(f, num))) != cur)
                cur = old;
        return f->arr[cur];
}

static struct sock *fanout_demux_cpu(struct packet_fanout *f, struct sk_buff *skb, unsigned int num)
{
        unsigned int cpu = smp_processor_id();

        return f->arr[cpu % num];
}

static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
                             struct packet_type *pt, struct net_device *orig_dev)
{
        struct packet_fanout *f = pt->af_packet_priv;
        unsigned int num = f->num_members;
        struct packet_sock *po;
        struct sock *sk;

        if (!net_eq(dev_net(dev), read_pnet(&f->net)) ||
            !num) {
                kfree_skb(skb);
                return 0;
        }

        switch (f->type) {
        case PACKET_FANOUT_HASH:
        default:
                if (f->defrag) {
                        skb = ip_check_defrag(skb, IP_DEFRAG_AF_PACKET);
                        if (!skb)
                                return 0;
                }
                skb_get_rxhash(skb);
                sk = fanout_demux_hash(f, skb, num);
                break;
        case PACKET_FANOUT_LB:
                sk = fanout_demux_lb(f, skb, num);
                break;
        case PACKET_FANOUT_CPU:
                sk = fanout_demux_cpu(f, skb, num);
                break;
        }

        po = pkt_sk(sk);

        return po->prot_hook.func(skb, dev, &po->prot_hook, orig_dev);
}

static DEFINE_MUTEX(fanout_mutex);
static LIST_HEAD(fanout_list);

static void __fanout_link(struct sock *sk, struct packet_sock *po)
{
        struct packet_fanout *f = po->fanout;

        spin_lock(&f->lock);
        f->arr[f->num_members] = sk;
        smp_wmb();
        f->num_members++;
        spin_unlock(&f->lock);
}

static void __fanout_unlink(struct sock *sk, struct packet_sock *po)
{
        struct packet_fanout *f = po->fanout;
        int i;

        spin_lock(&f->lock);
        for (i = 0; i < f->num_members; i++) {
                if (f->arr[i] == sk)
                        break;
        }
        BUG_ON(i >= f->num_members);
        f->arr[i] = f->arr[f->num_members - 1];
        f->num_members--;
        spin_unlock(&f->lock);
}

static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
{
        struct packet_sock *po = pkt_sk(sk);
        struct packet_fanout *f, *match;
        u8 type = type_flags & 0xff;
        u8 defrag = (type_flags & PACKET_FANOUT_FLAG_DEFRAG) ? 1 : 0;
        int err;

        switch (type) {
        case PACKET_FANOUT_HASH:
        case PACKET_FANOUT_LB:
        case PACKET_FANOUT_CPU:
                break;
        default:
                return -EINVAL;
        }

        if (!po->running)
                return -EINVAL;

        if (po->fanout)
                return -EALREADY;

        mutex_lock(&fanout_mutex);
        match = NULL;
        list_for_each_entry(f, &fanout_list, list) {
                if (f->id == id &&
                    read_pnet(&f->net) == sock_net(sk)) {
                        match = f;
                        break;
                }
        }
        err = -EINVAL;
        if (match && match->defrag != defrag)
                goto out;
        if (!match) {
                err = -ENOMEM;
                match = kzalloc(sizeof(*match), GFP_KERNEL);
                if (!match)
                        goto out;
                write_pnet(&match->net, sock_net(sk));
                match->id = id;
                match->type = type;
                match->defrag = defrag;
                atomic_set(&match->rr_cur, 0);
                INIT_LIST_HEAD(&match->list);
                spin_lock_init(&match->lock);
                atomic_set(&match->sk_ref, 0);
                match->prot_hook.type = po->prot_hook.type;
                match->prot_hook.dev = po->prot_hook.dev;
                match->prot_hook.func = packet_rcv_fanout;
                match->prot_hook.af_packet_priv = match;
                dev_add_pack(&match->prot_hook);
                list_add(&match->list, &fanout_list);
        }
        err = -EINVAL;
        if (match->type == type &&
            match->prot_hook.type == po->prot_hook.type &&
            match->prot_hook.dev == po->prot_hook.dev) {
                err = -ENOSPC;
                if (atomic_read(&match->sk_ref) < PACKET_FANOUT_MAX) {
                        __dev_remove_pack(&po->prot_hook);
                        po->fanout = match;
                        atomic_inc(&match->sk_ref);
                        __fanout_link(sk, po);
                        err = 0;
                }
        }
out:
        mutex_unlock(&fanout_mutex);
        return err;
}

static void fanout_release(struct sock *sk)
{
        struct packet_sock *po = pkt_sk(sk);
        struct packet_fanout *f;

        f = po->fanout;
        if (!f)
                return;

        po->fanout = NULL;

        mutex_lock(&fanout_mutex);
        if (atomic_dec_and_test(&f->sk_ref)) {
                list_del(&f->list);
                dev_remove_pack(&f->prot_hook);
                kfree(f);
        }
        mutex_unlock(&fanout_mutex);
}

static const struct proto_ops packet_ops;

static const struct proto_ops packet_ops_spkt;

static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
                           struct packet_type *pt, struct net_device *orig_dev)
{
        struct sock *sk;
        struct sockaddr_pkt *spkt;

        /*
         *      When we registered the protocol we saved the socket in the data
         *      field for just this event.
         */

        sk = pt->af_packet_priv;

        /*
         *      Yank back the headers [hope the device set this
         *      right or kerboom...]
         *
         *      Incoming packets have ll header pulled,
         *      push it back.
         *
         *      For outgoing ones skb->data == skb_mac_header(skb)
         *      so that this procedure is noop.
         */

        if (skb->pkt_type == PACKET_LOOPBACK)
                goto out;

        if (!net_eq(dev_net(dev), sock_net(sk)))
                goto out;

        skb = skb_share_check(skb, GFP_ATOMIC);
        if (skb == NULL)
                goto oom;

        /* drop any routing info */
        skb_dst_drop(skb);

        /* drop conntrack reference */
        nf_reset(skb);

        spkt = &PACKET_SKB_CB(skb)->sa.pkt;

        skb_push(skb, skb->data - skb_mac_header(skb));

        /*
         *      The SOCK_PACKET socket receives _all_ frames.
         */

        spkt->spkt_family = dev->type;
        strlcpy(spkt->spkt_device, dev->name, sizeof(spkt->spkt_device));
        spkt->spkt_protocol = skb->protocol;

        /*
         *      Charge the memory to the socket. This is done specifically
         *      to prevent sockets using all the memory up.
         */

        if (sock_queue_rcv_skb(sk, skb) == 0)
                return 0;

out:
        kfree_skb(skb);
oom:
        return 0;
}


/*
 *      Output a raw packet to a device layer. This bypasses all the other
 *      protocol layers and you must therefore supply it with a complete frame
 */

static int packet_sendmsg_spkt(struct kiocb *iocb, struct socket *sock,
                               struct msghdr *msg, size_t len)
{
        struct sock *sk = sock->sk;
        struct sockaddr_pkt *saddr = (struct sockaddr_pkt *)msg->msg_name;
        struct sk_buff *skb = NULL;
        struct net_device *dev;
        __be16 proto = 0;
        int err;

        /*
         *      Get and verify the address.
         */

        if (saddr) {
                if (msg->msg_namelen < sizeof(struct sockaddr))
                        return -EINVAL;
                if (msg->msg_namelen == sizeof(struct sockaddr_pkt))
                        proto = saddr->spkt_protocol;
        } else
                return -ENOTCONN;       /* SOCK_PACKET must be sent giving an address */

        /*
         *      Find the device first to size check it
         */

        saddr->spkt_device[13] = 0;
retry:
        rcu_read_lock();
        dev = dev_get_by_name_rcu(sock_net(sk), saddr->spkt_device);
        err = -ENODEV;
        if (dev == NULL)
                goto out_unlock;

        err = -ENETDOWN;
        if (!(dev->flags & IFF_UP))
                goto out_unlock;

        /*
         * You may not queue a frame bigger than the mtu. This is the lowest level
         * raw protocol and you must do your own fragmentation at this level.
         */

        err = -EMSGSIZE;
        if (len > dev->mtu + dev->hard_header_len + VLAN_HLEN)
                goto out_unlock;

        if (!skb) {
                size_t reserved = LL_RESERVED_SPACE(dev);
                int tlen = dev->needed_tailroom;
                unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;

                rcu_read_unlock();
                skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
                if (skb == NULL)
                        return -ENOBUFS;
                /* FIXME: Save some space for broken drivers that write a hard
                 * header at transmission time by themselves. PPP is the notable
                 * one here. This should really be fixed at the driver level.
                 */
                skb_reserve(skb, reserved);
                skb_reset_network_header(skb);

                /* Try to align data part correctly */
                if (hhlen) {
                        skb->data -= hhlen;
                        skb->tail -= hhlen;
                        if (len < hhlen)
                                skb_reset_network_header(skb);
                }
                err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
                if (err)
                        goto out_free;
                goto retry;
        }

        if (len > (dev->mtu + dev->hard_header_len)) {
                /* Earlier code assumed this would be a VLAN pkt,
                 * double-check this now that we have the actual
                 * packet in hand.
                 */
                struct ethhdr *ehdr;
                skb_reset_mac_header(skb);
                ehdr = eth_hdr(skb);
                if (ehdr->h_proto != htons(ETH_P_8021Q)) {
                        err = -EMSGSIZE;
                        goto out_unlock;
                }
        }

        skb->protocol = proto;
        skb->dev = dev;
        skb->priority = sk->sk_priority;
        skb->mark = sk->sk_mark;
        err = sock_tx_timestamp(sk, &skb_shinfo(skb)->tx_flags);
        if (err < 0)
                goto out_unlock;

        dev_queue_xmit(skb);
        rcu_read_unlock();
        return len;

out_unlock:
        rcu_read_unlock();
out_free:
        kfree_skb(skb);
        return err;
}

static unsigned int run_filter(const struct sk_buff *skb,
                                      const struct sock *sk,
                                      unsigned int res)
{
        struct sk_filter *filter;

        rcu_read_lock();
        filter = rcu_dereference(sk->sk_filter);
        if (filter != NULL)
                res = SK_RUN_FILTER(filter, skb);
        rcu_read_unlock();

        return res;
}

/*
 * This function makes lazy skb cloning in hope that most of packets
 * are discarded by BPF.
 *
 * Note tricky part: we DO mangle shared skb! skb->data, skb->len
 * and skb->cb are mangled. It works because (and until) packets
 * falling here are owned by current CPU. Output packets are cloned
 * by dev_queue_xmit_nit(), input packets are processed by net_bh
 * sequencially, so that if we return skb to original state on exit,
 * we will not harm anyone.
 */

static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
                      struct packet_type *pt, struct net_device *orig_dev)
{
        struct sock *sk;
        struct sockaddr_ll *sll;
        struct packet_sock *po;
        u8 *skb_head = skb->data;
        int skb_len = skb->len;
        unsigned int snaplen, res;

        if (skb->pkt_type == PACKET_LOOPBACK)
                goto drop;

        sk = pt->af_packet_priv;
        po = pkt_sk(sk);

        if (!net_eq(dev_net(dev), sock_net(sk)))
                goto drop;

        skb->dev = dev;

        if (dev->header_ops) {
                /* The device has an explicit notion of ll header,
                 * exported to higher levels.
                 *
                 * Otherwise, the device hides details of its frame
                 * structure, so that corresponding packet head is
                 * never delivered to user.
                 */
                if (sk->sk_type != SOCK_DGRAM)
                        skb_push(skb, skb->data - skb_mac_header(skb));
                else if (skb->pkt_type == PACKET_OUTGOING) {
                        /* Special case: outgoing packets have ll header at head */
                        skb_pull(skb, skb_network_offset(skb));
                }
        }

        snaplen = skb->len;

        res = run_filter(skb, sk, snaplen);
        if (!res)
                goto drop_n_restore;
        if (snaplen > res)
                snaplen = res;

        if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
                goto drop_n_acct;

        if (skb_shared(skb)) {
                struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
                if (nskb == NULL)
                        goto drop_n_acct;

                if (skb_head != skb->data) {
                        skb->data = skb_head;
                        skb->len = skb_len;
                }
                kfree_skb(skb);
                skb = nskb;
        }

        BUILD_BUG_ON(sizeof(*PACKET_SKB_CB(skb)) + MAX_ADDR_LEN - 8 >
                     sizeof(skb->cb));

        sll = &PACKET_SKB_CB(skb)->sa.ll;
        sll->sll_family = AF_PACKET;
        sll->sll_hatype = dev->type;
        sll->sll_protocol = skb->protocol;
        sll->sll_pkttype = skb->pkt_type;
        if (unlikely(po->origdev))
                sll->sll_ifindex = orig_dev->ifindex;
        else
                sll->sll_ifindex = dev->ifindex;

        sll->sll_halen = dev_parse_header(skb, sll->sll_addr);

        PACKET_SKB_CB(skb)->origlen = skb->len;

        if (pskb_trim(skb, snaplen))
                goto drop_n_acct;

        skb_set_owner_r(skb, sk);
        skb->dev = NULL;
        skb_dst_drop(skb);

        /* drop conntrack reference */
        nf_reset(skb);

        spin_lock(&sk->sk_receive_queue.lock);
        po->stats.tp_packets++;
        skb->dropcount = atomic_read(&sk->sk_drops);
        __skb_queue_tail(&sk->sk_receive_queue, skb);
        spin_unlock(&sk->sk_receive_queue.lock);
        sk->sk_data_ready(sk, skb->len);
        return 0;

drop_n_acct:
        spin_lock(&sk->sk_receive_queue.lock);
        po->stats.tp_drops++;
        atomic_inc(&sk->sk_drops);
        spin_unlock(&sk->sk_receive_queue.lock);

drop_n_restore:
        if (skb_head != skb->data && skb_shared(skb)) {
                skb->data = skb_head;
                skb->len = skb_len;
        }
drop:
        consume_skb(skb);
        return 0;
}

static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
                       struct packet_type *pt, struct net_device *orig_dev)
{
        struct sock *sk;
        struct packet_sock *po;
        struct sockaddr_ll *sll;
        union {
                struct tpacket_hdr *h1;
                struct tpacket2_hdr *h2;
                struct tpacket3_hdr *h3;
                void *raw;
        } h;
        u8 *skb_head = skb->data;
        int skb_len = skb->len;
        unsigned int snaplen, res;
        unsigned long status = TP_STATUS_USER;
        unsigned short macoff, netoff, hdrlen;
        struct sk_buff *copy_skb = NULL;
        struct timeval tv;
        struct timespec ts;
        struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);

        if (skb->pkt_type == PACKET_LOOPBACK)
                goto drop;

        sk = pt->af_packet_priv;
        po = pkt_sk(sk);

        if (!net_eq(dev_net(dev), sock_net(sk)))
                goto drop;

        if (dev->header_ops) {
                if (sk->sk_type != SOCK_DGRAM)
                        skb_push(skb, skb->data - skb_mac_header(skb));
                else if (skb->pkt_type == PACKET_OUTGOING) {
                        /* Special case: outgoing packets have ll header at head */
                        skb_pull(skb, skb_network_offset(skb));
                }
        }

        if (skb->ip_summed == CHECKSUM_PARTIAL)
                status |= TP_STATUS_CSUMNOTREADY;

        snaplen = skb->len;

        res = run_filter(skb, sk, snaplen);
        if (!res)
                goto drop_n_restore;
        if (snaplen > res)
                snaplen = res;

        if (sk->sk_type == SOCK_DGRAM) {
                macoff = netoff = TPACKET_ALIGN(po->tp_hdrlen) + 16 +
                                  po->tp_reserve;
        } else {
                unsigned maclen = skb_network_offset(skb);
                netoff = TPACKET_ALIGN(po->tp_hdrlen +
                                       (maclen < 16 ? 16 : maclen)) +
                        po->tp_reserve;
                macoff = netoff - maclen;
        }
        if (po->tp_version <= TPACKET_V2) {
                if (macoff + snaplen > po->rx_ring.frame_size) {
                        if (po->copy_thresh &&
                            atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
                                if (skb_shared(skb)) {
                                        copy_skb = skb_clone(skb, GFP_ATOMIC);
                                } else {
                                        copy_skb = skb_get(skb);
                                        skb_head = skb->data;
                                }
                                if (copy_skb)
                                        skb_set_owner_r(copy_skb, sk);
                        }
                        snaplen = po->rx_ring.frame_size - macoff;
                        if ((int)snaplen < 0)
                                snaplen = 0;
                }
        }
        spin_lock(&sk->sk_receive_queue.lock);
        h.raw = packet_current_rx_frame(po, skb,
                                        TP_STATUS_KERNEL, (macoff+snaplen));
        if (!h.raw)
                goto ring_is_full;
        if (po->tp_version <= TPACKET_V2) {
                packet_increment_rx_head(po, &po->rx_ring);
        /*
         * LOSING will be reported till you read the stats,
         * because it's COR - Clear On Read.
         * Anyways, moving it for V1/V2 only as V3 doesn't need this
         * at packet level.
         */
                if (po->stats.tp_drops)
                        status |= TP_STATUS_LOSING;
        }
        po->stats.tp_packets++;
        if (copy_skb) {
                status |= TP_STATUS_COPY;
                __skb_queue_tail(&sk->sk_receive_queue, copy_skb);
        }
        spin_unlock(&sk->sk_receive_queue.lock);

        skb_copy_bits(skb, 0, h.raw + macoff, snaplen);

        switch (po->tp_version) {
        case TPACKET_V1:
                h.h1->tp_len = skb->len;
                h.h1->tp_snaplen = snaplen;
                h.h1->tp_mac = macoff;
                h.h1->tp_net = netoff;
                if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
                                && shhwtstamps->syststamp.tv64)
                        tv = ktime_to_timeval(shhwtstamps->syststamp);
                else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
                                && shhwtstamps->hwtstamp.tv64)
                        tv = ktime_to_timeval(shhwtstamps->hwtstamp);
                else if (skb->tstamp.tv64)
                        tv = ktime_to_timeval(skb->tstamp);
                else
                        do_gettimeofday(&tv);
                h.h1->tp_sec = tv.tv_sec;
                h.h1->tp_usec = tv.tv_usec;
                hdrlen = sizeof(*h.h1);
                break;
        case TPACKET_V2:
                h.h2->tp_len = skb->len;
                h.h2->tp_snaplen = snaplen;
                h.h2->tp_mac = macoff;
                h.h2->tp_net = netoff;
                if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
                                && shhwtstamps->syststamp.tv64)
                        ts = ktime_to_timespec(shhwtstamps->syststamp);
                else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
                                && shhwtstamps->hwtstamp.tv64)
                        ts = ktime_to_timespec(shhwtstamps->hwtstamp);
                else if (skb->tstamp.tv64)
                        ts = ktime_to_timespec(skb->tstamp);
                else
                        getnstimeofday(&ts);
                h.h2->tp_sec = ts.tv_sec;
                h.h2->tp_nsec = ts.tv_nsec;
                if (vlan_tx_tag_present(skb)) {
                        h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
                        status |= TP_STATUS_VLAN_VALID;
                } else {
                        h.h2->tp_vlan_tci = 0;
                }
                h.h2->tp_padding = 0;
                hdrlen = sizeof(*h.h2);
                break;
        case TPACKET_V3:
                /* tp_nxt_offset,vlan are already populated above.
                 * So DONT clear those fields here
                 */
                h.h3->tp_status |= status;
                h.h3->tp_len = skb->len;
                h.h3->tp_snaplen = snaplen;
                h.h3->tp_mac = macoff;
                h.h3->tp_net = netoff;
                if ((po->tp_tstamp & SOF_TIMESTAMPING_SYS_HARDWARE)
                                && shhwtstamps->syststamp.tv64)
                        ts = ktime_to_timespec(shhwtstamps->syststamp);
                else if ((po->tp_tstamp & SOF_TIMESTAMPING_RAW_HARDWARE)
                                && shhwtstamps->hwtstamp.tv64)
                        ts = ktime_to_timespec(shhwtstamps->hwtstamp);
                else if (skb->tstamp.tv64)
                        ts = ktime_to_timespec(skb->tstamp);
                else
                        getnstimeofday(&ts);
                h.h3->tp_sec  = ts.tv_sec;
                h.h3->tp_nsec = ts.tv_nsec;
                hdrlen = sizeof(*h.h3);
                break;
        default:
                BUG();
        }

        sll = h.raw + TPACKET_ALIGN(hdrlen);
        sll->sll_halen = dev_parse_header(skb, sll->sll_addr);
        sll->sll_family = AF_PACKET;
        sll->sll_hatype = dev->type;
        sll->sll_protocol = skb->protocol;
        sll->sll_pkttype = skb->pkt_type;
        if (unlikely(po->origdev))
                sll->sll_ifindex = orig_dev->ifindex;
        else
                sll->sll_ifindex = dev->ifindex;

        smp_mb();
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
        {
                u8 *start, *end;

                if (po->tp_version <= TPACKET_V2) {
                        end = (u8 *)PAGE_ALIGN((unsigned long)h.raw
                                + macoff + snaplen);
                        for (start = h.raw; start < end; start += PAGE_SIZE)
                                flush_dcache_page(pgv_to_page(start));
                }
                smp_wmb();
        }
#endif
        if (po->tp_version <= TPACKET_V2)
                __packet_set_status(po, h.raw, status);
        else
                prb_clear_blk_fill_status(&po->rx_ring);

        sk->sk_data_ready(sk, 0);

drop_n_restore:
        if (skb_head != skb->data && skb_shared(skb)) {
                skb->data = skb_head;
                skb->len = skb_len;
        }
drop:
        kfree_skb(skb);
        return 0;

ring_is_full:
        po->stats.tp_drops++;
        spin_unlock(&sk->sk_receive_queue.lock);

        sk->sk_data_ready(sk, 0);
        kfree_skb(copy_skb);
        goto drop_n_restore;
}

static void tpacket_destruct_skb(struct sk_buff *skb)
{
        struct packet_sock *po = pkt_sk(skb->sk);
        void *ph;

        if (likely(po->tx_ring.pg_vec)) {
                ph = skb_shinfo(skb)->destructor_arg;
                BUG_ON(__packet_get_status(po, ph) != TP_STATUS_SENDING);
                BUG_ON(atomic_read(&po->tx_ring.pending) == 0);
                atomic_dec(&po->tx_ring.pending);
                __packet_set_status(po, ph, TP_STATUS_AVAILABLE);
        }

        sock_wfree(skb);
}

static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
                void *frame, struct net_device *dev, int size_max,
                __be16 proto, unsigned char *addr, int hlen)
{
        union {
                struct tpacket_hdr *h1;
                struct tpacket2_hdr *h2;
                void *raw;
        } ph;
        int to_write, offset, len, tp_len, nr_frags, len_max;
        struct socket *sock = po->sk.sk_socket;
        struct page *page;
        void *data;
        int err;

        ph.raw = frame;

        skb->protocol = proto;
        skb->dev = dev;
        skb->priority = po->sk.sk_priority;
        skb->mark = po->sk.sk_mark;
        skb_shinfo(skb)->destructor_arg = ph.raw;

        switch (po->tp_version) {
        case TPACKET_V2:
                tp_len = ph.h2->tp_len;
                break;
        default:
                tp_len = ph.h1->tp_len;
                break;
        }
        if (unlikely(tp_len > size_max)) {
                pr_err("packet size is too long (%d > %d)\n", tp_len, size_max);
                return -EMSGSIZE;
        }

        skb_reserve(skb, hlen);
        skb_reset_network_header(skb);

        data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
        to_write = tp_len;

        if (sock->type == SOCK_DGRAM) {
                err = dev_hard_header(skb, dev, ntohs(proto), addr,
                                NULL, tp_len);
                if (unlikely(err < 0))
                        return -EINVAL;
        } else if (dev->hard_header_len) {
                /* net device doesn't like empty head */
                if (unlikely(tp_len <= dev->hard_header_len)) {
                        pr_err("packet size is too short (%d < %d)\n",
                               tp_len, dev->hard_header_len);
                        return -EINVAL;
                }

                skb_push(skb, dev->hard_header_len);
                err = skb_store_bits(skb, 0, data,