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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "AppleFastDatapathProbe.h"
#if defined(XP_MACOSX) || defined(XP_IOS)
# include <dlfcn.h>
# include <netinet/in.h>
# include <sys/socket.h>
# include <sys/types.h>
# include <unistd.h>
# include "mozilla/Logging.h"
# include "mozilla/ScopeExit.h"
# include "mozilla/StaticPrefs_network.h"
# include "mozilla/net/neqo_glue_ffi_generated.h"
namespace mozilla::net {
namespace {
bool ProbeAppleFastDatapath() {
// Fast-fail if the private symbols are not present.
if (!dlsym(RTLD_DEFAULT, "sendmsg_x") || !dlsym(RTLD_DEFAULT, "recvmsg_x")) {
return false;
}
// Create two UDP sockets bound to localhost, mirroring neqo's usage of
// unconnected sockets where the destination is specified per-datagram.
auto makeSocket = []() -> int {
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
return -1;
}
sockaddr_in addr = {};
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
if (bind(fd, reinterpret_cast<sockaddr*>(&addr), sizeof(addr)) < 0) {
close(fd);
return -1;
}
return fd;
};
int sendFd = makeSocket();
if (sendFd < 0) {
return false;
}
int recvFd = makeSocket();
if (recvFd < 0) {
close(sendFd);
return false;
}
auto closeFds = mozilla::MakeScopeExit([sendFd, recvFd]() {
close(sendFd);
close(recvFd);
});
return neqo_glue_probe_apple_fast_path(sendFd, recvFd);
}
} // namespace
bool InitAppleFastDatapathProbe() {
static mozilla::LazyLogModule sLog("AppleFastDatapath");
static bool sAvailable = []() {
if (!mozilla::StaticPrefs::network_http_http3_apple_fast_datapath()) {
return false;
}
bool available = ProbeAppleFastDatapath();
if (available) {
neqo_glue_enable_apple_fast_path();
}
MOZ_LOG(sLog, mozilla::LogLevel::Debug,
("Apple fast datapath probe: available=%s",
available ? "true" : "false"));
return available;
}();
return sAvailable;
}
} // namespace mozilla::net
#else // Not Apple
namespace mozilla::net {
bool InitAppleFastDatapathProbe() { return false; }
} // namespace mozilla::net
#endif