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 "qemu/error-report.h"
  15 #include "qemu/iov.h"
  16 #include "qemu/log.h"
  17 #include "qemu/module.h"
  18 #include "qemu/timer.h"
  19 #include "qapi/visitor.h"
  20 #include "net/filter.h"
  21 #include "sysemu/replay.h"
  22 #include "qom/object.h"
  23
  24 #define TYPE_FILTER_REPLAY "filter-replay"
  25
  26 OBJECT_DECLARE_SIMPLE_TYPE(NetFilterReplayState, FILTER_REPLAY)
  27
  28 struct NetFilterReplayState {
  29     NetFilterState nfs;
  30     ReplayNetState *rns;
  31 };
  32
  33 static ssize_t filter_replay_receive_iov(NetFilterState *nf,
  34                                          NetClientState *sndr,
  35                                          unsigned flags,
  36                                          const struct iovec *iov,
  37                                          int iovcnt, NetPacketSent *sent_cb)
  38 {
  39     NetFilterReplayState *nfrs = FILTER_REPLAY(nf);
  40     switch (replay_mode) {
  41     case REPLAY_MODE_RECORD:
  42         if (nf->netdev == sndr) {
  43             replay_net_packet_event(nfrs->rns, flags, iov, iovcnt);
  44             return iov_size(iov, iovcnt);
  45         }
  46         return 0;
  47     case REPLAY_MODE_PLAY:
  48         /* Drop all packets in replay mode.
  49            Packets from the log will be injected by the replay module. */
  50         return iov_size(iov, iovcnt);
  51     default:
  52         /* Pass all the packets. */
  53         return 0;
  54     }
  55 }
  56
  57 static void filter_replay_instance_init(Object *obj)
  58 {
  59     NetFilterReplayState *nfrs = FILTER_REPLAY(obj);
  60     nfrs->rns = replay_register_net(&nfrs->nfs);
  61 }
  62
  63 static void filter_replay_instance_finalize(Object *obj)
  64 {
  65     NetFilterReplayState *nfrs = FILTER_REPLAY(obj);
  66     replay_unregister_net(nfrs->rns);
  67 }
  68
  69 static void filter_replay_class_init(ObjectClass *oc, void *data)
  70 {
  71     NetFilterClass *nfc = NETFILTER_CLASS(oc);
  72
  73     nfc->receive_iov = filter_replay_receive_iov;
  74 }
  75
  76 static const TypeInfo filter_replay_info = {
  77     .name = TYPE_FILTER_REPLAY,
  78     .parent = TYPE_NETFILTER,
  79     .class_init = filter_replay_class_init,
  80     .instance_init = filter_replay_instance_init,
  81     .instance_finalize = filter_replay_instance_finalize,
  82     .instance_size = sizeof(NetFilterReplayState),
  83 };
  84
  85 static void filter_replay_register_types(void)
  86 {
  87     type_register_static(&filter_replay_info);
  88 }
  89
  90 type_init(filter_replay_register_types);