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Author SHA1 Message Date
Stanislav Fomichev 6b6a23d5d8 bpf: Document EFAULT changes for sockopt 
And add examples for how to correctly handle large optlens.
This is less relevant now when we don't EFAULT anymore, but
that's still the correct thing to do.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20230511170456.1759459-5-sdf@google.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
 2023-05-13 16:55:46 -07:00
Stanislav Fomichev 8030e250d8 bpf: Document optval > PAGE_SIZE behavior for sockopt hooks 
Extend existing doc with more details about requiring ctx->optlen = 0
for handling optval > PAGE_SIZE.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200617010416.93086-3-sdf@google.com
 2020-06-17 10:54:05 -07:00
Stanislav Fomichev 0c51b3697a bpf: add sockopt documentation 
Provide user documentation about sockopt prog type and cgroup hooks.

v9:
* add details about setsockopt context and inheritance

v7:
* add description for retval=0 and optlen=-1

v6:
* describe cgroup chaining, add example

v2:
* use return code 2 for kernel bypass

Cc: Andrii Nakryiko <andriin@fb.com>
Cc: Martin Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
 2019-06-27 15:25:17 -07:00