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tcp: ulp: add functions to dump ulp-specific information

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currently, only getsockopt(TCP_ULP) can be invoked to know if a ULP is on
top of a TCP socket. Extend idiag_get_aux() and idiag_get_aux_size(),
introduced by commit b37e88407c ("inet_diag: allow protocols to provide
additional data"), to report the ULP name and other information that can
be made available by the ULP through optional functions.

Users having CAP_NET_ADMIN privileges will then be able to retrieve this
information through inet_diag_handler, if they specify INET_DIAG_INFO in
the request.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Davide Caratti
2019-08-30 12:25:48 +02:00
committed by David S. Miller
parent 15a7dea750
commit 61723b3932
3 changed files with 62 additions and 1 deletions
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3
include/net/tcp.h
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@@ -2122,6 +2122,9 @@ struct tcp_ulp_ops {
void (*update)(struct sock *sk, struct proto *p);
/* cleanup ulp */
void (*release)(struct sock *sk);
/* diagnostic */
int (*get_info)(const struct sock *sk, struct sk_buff *skb);
size_t (*get_info_size)(const struct sock *sk);
char name[TCP_ULP_NAME_MAX];
struct module *owner;