BUG: Error setting DSCP/ToS field for IPv6 ICMP packets

[olafayomi]

Describe the issue:

Hi,
I'm trying to set the DSCP/ToS field for outgoing IPv6 ICMP packets with gufo-ping but I am getting a 'Protocol not available (os error 92)' . It seems IPv4 uses IPPROTO_IP/IP_TOS while IPv6 uses IPPROTO_IPV6/IPV6_TCLASS. I was wondering if this has been encountered before?

regards
Dimeji

Reproduce the code example:

import asyncio
import sys

from gufo.ping import Ping


async def main(address: str, size: int = 64, count: int = 10) -> None:
    ping = Ping(size=size, tos=48)
    n = 0
    print(f"PING {address}: {size} bytes")
    received = 0
    async for r in ping.iter_rtt(address):
        if r is None:
            print(f"Request timeout for icmp_seq {n}")
        else:
            print(
                f"{size} bytes from {address}: "
                f"icmp_seq={n} time={r*1000.0:.3f}ms"
            )
            received += 1
        n += 1
        if n >= count:
            break
    print(f"--- {address} ping statistics ---")
    loss = float(count - received) / float(count) * 100.0
    print(
        f"{count} packets transmitted, "
        f"{received} packets received, "
        f"{loss:.1f}% packet loss"
        )


if __name__ == "__main__":
        asyncio.run(main(sys.argv[1]))

Error message:

python gufo-ping.py  2001:df01::1
PING 2001:df01::1: 64 bytes
Traceback (most recent call last):
  File "gufo-ping.py", line 34, in <module>
    asyncio.run(main(sys.argv[1]))
  File "/usr/lib/python3.8/asyncio/runners.py", line 43, in run
    return loop.run_until_complete(main)
  File "/usr/lib/python3.8/asyncio/base_events.py", line 608, in run_until_complete
    return future.result()
  File "gufo-ping.py", line 12, in main
    async for r in ping.iter_rtt(address):
  File "/home/ubuntu/gufo-ping/lib/python3.8/site-packages/gufo/ping/ping.py", line 195, in iter_rtt
    sock = self.__get_socket(addr)
  File "/home/ubuntu/gufo-ping/lib/python3.8/site-packages/gufo/ping/ping.py", line 120, in __get_socket
    sock = PingSocket(
  File "/home/ubuntu/gufo-ping/lib/python3.8/site-packages/gufo/ping/socket.py", line 69, in __init__
    self.__sock.set_tos(tos)
OSError: Protocol not available (os error 92)

Python version information

python print-version.py
3.8.0 (default, Dec 9 2021, 17:53:27)
[GCC 8.4.0]

Gufo Ping version information

gufo-ping version: 0.2.4

Operation system version

Ubuntu 18.04

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.6 LTS
Release: 18.04
Codename: bionic

[olafayomi]

@dvolodin7 Hi Dmitry,
How can I help with fixing this bug ? I don't know much about Rust but I could help with the Python side of it. Fixing this bug or adding the source address feature will greatly help with what I'm trying to do.

[dvolodin7]

Hi,

I have reproduced this error. BTW, setting ttl on IPv6 is also fails.

[dvolodin7]

I have open the issue rust-lang/socket2#420