Add IP_ADD_MEMBERSHIP_SOURCE, IP_DROP_SOURCE_MEMBERSHIP(sockops) and ip_mreq_source(struct)

[MaxF12]

The calls for ASM multicast (IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP and ip_mreq are present but unfortunately the ones for source specific multicast are missing. Any chance these could please be added?

Man page

[MaxF12]

To be more specific, they are missing in src/unix/bsd/apple/mod.rs, even though they are available on MacOS. (And many other Unix based systems as well as Windows)

[MaxF12]

For MacOS the sockops are:

/* IPv4 Source Filter Multicast API [RFC3678] /
#define IP_ADD_SOURCE_MEMBERSHIP 70 / join a source-specific group /
#define IP_DROP_SOURCE_MEMBERSHIP 71 / drop a single source /
#define IP_BLOCK_SOURCE 72 / block a source /
#define IP_UNBLOCK_SOURCE 73 / unblock a source */