2018-04-10 10:50 UTC-0700 ~ Andrey Ignatov <rdna@xxxxxx>
> Quentin Monnet <quentin.monnet@xxxxxxxxxxxxx> [Tue, 2018-04-10 07:43 -0700]:
>> + * int bpf_bind(struct bpf_sock_addr_kern *ctx, struct sockaddr *addr, int addr_len)
>> + * Description
>> + * Bind the socket associated to *ctx* to the address pointed by
>> + * *addr*, of length *addr_len*. This allows for making outgoing
>> + * connection from the desired IP address, which can be useful for
>> + * example when all processes inside a cgroup should use one
>> + * single IP address on a host that has multiple IP configured.
>> + *
>> + * This helper works for IPv4 and IPv6, TCP and UDP sockets. The
>> + * domain (*addr*\ **->sa_family**) must be **AF_INET** (or
>> + * **AF_INET6**). Looking for a free port to bind to can be
>> + * expensive, therefore binding to port is not permitted by the
>> + * helper: *addr*\ **->sin_port** (or **sin6_port**, respectively)
>> + * must be set to zero.
>> + *
>> + * As for the remote end, both parts of it can be overridden,
>> + * remote IP and remote port. This can be useful if an application
>> + * inside a cgroup wants to connect to another application inside
>> + * the same cgroup or to itself, but knows nothing about the IP
>> + * address assigned to the cgroup.
>
> The last paragraph ("As for the remote end ...") is not relevant to
> bpf_bind() and should be removed. It's about sys_connect hook itself
> that can call to bpf_bind() but also has other functionality (and that
> other functionality is described by this paragraph).
Thanks Andrey, I will remove this paragraph.
Quentin
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