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