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bpo-37345: Add formal UDPLITE support (GH-14258)

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At the moment you can definitely use UDPLITE sockets on Linux systems, but it would be good if this support were formalized such that you can detect support at runtime easily.

At the moment, to make and use a UDPLITE socket requires something like the following code:

```
>>> import socket
>>> a = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 136)
>>> b = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 136)
>>> a.bind(('localhost', 44444))
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.setsockopt(136, 10, 16)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.setsockopt(136, 10, 32)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.setsockopt(136, 10, 64)
>>> b.sendto(b'test'*256, ('localhost', 44444))
```

If you look at this through Wireshark, you can see that the packets are different in that the checksums and checksum coverages change.

With the pull request that I am submitting momentarily, you could do the following code instead:

```
>>> import socket
>>> a = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDPLITE)
>>> b = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDPLITE)
>>> a.bind(('localhost', 44444))
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.set_send_checksum_coverage(16)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.set_send_checksum_coverage(32)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.set_send_checksum_coverage(64)
>>> b.sendto(b'test'*256, ('localhost', 44444))
```

One can also detect support for UDPLITE just by checking

```
>>> hasattr(socket, 'IPPROTO_UDPLITE')
```


https://bugs.python.org/issue37345
This commit is contained in:
Gabe Appleton 2019-06-24 02:58:56 -07:00 • committed by Miss Islington (bot)
parent 770847a7db
commit 2ac3bab2a6
4 changed files with 217 additions and 0 deletions
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11
Modules/socketmodule.c
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@ -7737,6 +7737,17 @@ PyInit__socket(void)
#else
PyModule_AddIntConstant(m, "IPPROTO_UDP", 17);
#endif
#ifdef IPPROTO_UDPLITE
PyModule_AddIntMacro(m, IPPROTO_UDPLITE);
#ifndef UDPLITE_SEND_CSCOV
#define UDPLITE_SEND_CSCOV 10
#endif
PyModule_AddIntMacro(m, UDPLITE_SEND_CSCOV);
#ifndef UDPLITE_RECV_CSCOV
#define UDPLITE_RECV_CSCOV 11
#endif
PyModule_AddIntMacro(m, UDPLITE_RECV_CSCOV);
#endif
#ifdef IPPROTO_IDP
PyModule_AddIntMacro(m, IPPROTO_IDP);
#endif