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