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Add controls for MTU size of virtual socket server

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This will allow us to write tests for what happens when large datagrams
are discarded.

Bug: webrtc:12495
Change-Id: I5c8e9fe55917967ea4604e1b3abe3c590c330ffa
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/211044
Reviewed-by: Taylor <deadbeef@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33425}
This commit is contained in:
Harald Alvestrand 2021-03-10 07:29:28 +00:00 committed by Commit Bot
parent bccfd26322
commit 3d792e990a
2 changed files with 32 additions and 0 deletions
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15
rtc_base/virtual_socket_server.cc
View File

@ -900,7 +900,22 @@ int VirtualSocketServer::SendUdp(VirtualSocket* socket,
return -1;
}
if (data_size > largest_seen_udp_payload_) {
if (data_size > 1000) {
RTC_LOG(LS_VERBOSE) << "Largest UDP seen is " << data_size;
}
largest_seen_udp_payload_ = data_size;
}
// See if we want to drop this packet.
if (data_size > max_udp_payload_) {
RTC_LOG(LS_VERBOSE) << "Dropping too large UDP payload of size "
<< data_size << ", UDP payload limit is "
<< max_udp_payload_;
// Return as if send was successful; packet disappears.
return data_size;
}
if (Random() < drop_prob_) {
RTC_LOG(LS_VERBOSE) << "Dropping packet: bad luck";
return static_cast<int>(data_size);

17
rtc_base/virtual_socket_server.h
View File

@ -94,6 +94,16 @@ class VirtualSocketServer : public SocketServer, public sigslot::has_slots<> {
drop_prob_ = drop_prob;
}
// Controls the maximum UDP payload for the networks simulated
// by this server. Any UDP payload sent that is larger than this will
// be dropped.
size_t max_udp_payload() { return max_udp_payload_; }
void set_max_udp_payload(size_t payload_size) {
max_udp_payload_ = payload_size;
}
size_t largest_seen_udp_payload() { return largest_seen_udp_payload_; }
// If |blocked| is true, subsequent attempts to send will result in -1 being
// returned, with the socket error set to EWOULDBLOCK.
//
@ -308,6 +318,13 @@ class VirtualSocketServer : public SocketServer, public sigslot::has_slots<> {
std::unique_ptr<Function> delay_dist_;
double drop_prob_;
// The largest UDP payload permitted on this virtual socket server.
// The default is the max size of IPv4 fragmented UDP packet payload:
// 65535 bytes - 8 bytes UDP header - 20 bytes IP header.
size_t max_udp_payload_ = 65507;
// The largest UDP payload seen so far.
size_t largest_seen_udp_payload_ = 0;
bool sending_blocked_ = false;
RTC_DISALLOW_COPY_AND_ASSIGN(VirtualSocketServer);
};