ba74a7608d
A latter patch refactors bpf_getsockopt(SOL_SOCKET) with the sock_getsockopt() to avoid code duplication and code drift between the two duplicates. The current sock_getsockopt() takes sock ptr as the argument. The very first thing of this function is to get back the sk ptr by 'sk = sock->sk'. bpf_getsockopt() could be called when the sk does not have the sock ptr created. Meaning sk->sk_socket is NULL. For example, when a passive tcp connection has just been established but has yet been accept()-ed. Thus, it cannot use the sock_getsockopt(sk->sk_socket) or else it will pass a NULL ptr. This patch moves all sock_getsockopt implementation to the newly added sk_getsockopt(). The new sk_getsockopt() takes a sk ptr and immediately gets the sock ptr by 'sock = sk->sk_socket' The existing sock_getsockopt(sock) is changed to call sk_getsockopt(sock->sk). All existing callers have both sock->sk and sk->sk_socket pointer. The latter patch will make bpf_getsockopt(SOL_SOCKET) call sk_getsockopt(sk) directly. The bpf_getsockopt(SOL_SOCKET) does not use the optnames that require sk->sk_socket, so it will be safe. Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Link: https://lore.kernel.org/r/20220902002756.2887884-1-kafai@fb.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.