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Swallow SO_RCVBUFFORCE and SO_SNDBUFFORCE errors on SOCK_RAW sockets

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In --network=sandbox mode, we create SOCK_RAW sockets on the given
network device. The code tries to force-set 4MiB rcv and snd buffers
on it, but in certain situations it might fail. There is no reason
for refusing the sandbox startup in such case - we should bump the
buffers to max availabe size and just move on.
This commit is contained in:
Marek Majkowski
2020-09-25 13:23:52 +02:00
parent d201feb8c5
commit 6f5114446a
1 changed files with 11 additions and 2 deletions
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runsc/sandbox/network.go
+11 -2
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@@ -309,11 +309,20 @@ func createSocket(iface net.Interface, ifaceLink netlink.Link, enableGSO bool) (
const bufSize = 4 << 20 // 4MB.
if err := syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUFFORCE, bufSize); err != nil {
return nil, fmt.Errorf("failed to increase socket rcv buffer to %d: %v", bufSize, err)
syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF, bufSize)
sz, _ := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_RCVBUF)
if sz < bufSize {
log.Warningf("Failed to increase rcv buffer to %d on SOCK_RAW on %s. Current buffer %d: %v", bufSize, iface.Name, sz, err)
}
}
if err := syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_SNDBUFFORCE, bufSize); err != nil {
return nil, fmt.Errorf("failed to increase socket snd buffer to %d: %v", bufSize, err)
syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_SNDBUF, bufSize)
sz, _ := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_SNDBUF)
if sz < bufSize {
log.Warningf("Failed to increase snd buffer to %d on SOCK_RAW on %s. Curent buffer %d: %v", bufSize, iface.Name, sz, err)
}
}
return &socketEntry{deviceFile, gsoMaxSize}, nil