net/filter-replay.c

   1 /*
   2  * filter-replay.c
   3  *
   4  * Copyright (c) 2010-2016 Institute for System Programming
   5  *                         of the Russian Academy of Sciences.
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   8  * See the COPYING file in the top-level directory.
   9  *
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "clients.h"
  14 #include "qapi/error.h"
  15 #include "qemu-common.h"
  16 #include "qemu/error-report.h"
  17 #include "qemu/iov.h"
  18 #include "qemu/log.h"
  19 #include "qemu/timer.h"
  20 #include "qapi/visitor.h"
  21 #include "net/filter.h"
  22 #include "sysemu/replay.h"
  23
  24 #define TYPE_FILTER_REPLAY "filter-replay"
  25
  26 #define FILTER_REPLAY(obj) \
  27     OBJECT_CHECK(NetFilterReplayState, (obj), TYPE_FILTER_REPLAY)
  28
  29 struct NetFilterReplayState {
  30     NetFilterState nfs;
  31     ReplayNetState *rns;
  32 };
  33 typedef struct NetFilterReplayState NetFilterReplayState;
  34
  35 static ssize_t filter_replay_receive_iov(NetFilterState *nf,
  36                                          NetClientState *sndr,
  37                                          unsigned flags,
  38                                          const struct iovec *iov,
  39                                          int iovcnt, NetPacketSent *sent_cb)
  40 {
  41     NetFilterReplayState *nfrs = FILTER_REPLAY(nf);
  42     switch (replay_mode) {
  43     case REPLAY_MODE_RECORD:
  44         if (nf->netdev == sndr) {
  45             replay_net_packet_event(nfrs->rns, flags, iov, iovcnt);
  46             return iov_size(iov, iovcnt);
  47         }
  48         return 0;
  49     case REPLAY_MODE_PLAY:
  50         /* Drop all packets in replay mode.
  51            Packets from the log will be injected by the replay module. */
  52         return iov_size(iov, iovcnt);
  53     default:
  54         /* Pass all the packets. */
  55         return 0;
  56     }
  57 }
  58
  59 static void filter_replay_instance_init(Object *obj)
  60 {
  61     NetFilterReplayState *nfrs = FILTER_REPLAY(obj);
  62     nfrs->rns = replay_register_net(&nfrs->nfs);
  63 }
  64
  65 static void filter_replay_instance_finalize(Object *obj)
  66 {
  67     NetFilterReplayState *nfrs = FILTER_REPLAY(obj);
  68     replay_unregister_net(nfrs->rns);
  69 }
  70
  71 static void filter_replay_class_init(ObjectClass *oc, void *data)
  72 {
  73     NetFilterClass *nfc = NETFILTER_CLASS(oc);
  74
  75     nfc->receive_iov = filter_replay_receive_iov;
  76 }
  77
  78 static const TypeInfo filter_replay_info = {
  79     .name = TYPE_FILTER_REPLAY,
  80     .parent = TYPE_NETFILTER,
  81     .class_init = filter_replay_class_init,
  82     .instance_init = filter_replay_instance_init,
  83     .instance_finalize = filter_replay_instance_finalize,
  84     .instance_size = sizeof(NetFilterReplayState),
  85 };
  86
  87 static void filter_replay_register_types(void)
  88 {
  89     type_register_static(&filter_replay_info);
  90 }
  91
  92 type_init(filter_replay_register_types);