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bpf: Add bpf_skc_to_{tcp, tcp_timewait, tcp_request}_sock() helpers

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Three more helpers are added to cast a sock_common pointer to
an tcp_sock, tcp_timewait_sock or a tcp_request_sock for
tracing programs.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200623230811.3988277-1-yhs@fb.com
This commit is contained in:
Yonghong Song
2020-06-23 16:08:11 -07:00
committed by Alexei Starovoitov
parent af7ec13833
commit 478cfbdf5f
6 changed files with 121 additions and 2 deletions
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23
tools/include/uapi/linux/bpf.h
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@@ -3261,6 +3261,24 @@ union bpf_attr {
* Dynamically cast a *sk* pointer to a *tcp6_sock* pointer.
* Return
* *sk* if casting is valid, or NULL otherwise.
*
* struct tcp_sock *bpf_skc_to_tcp_sock(void *sk)
* Description
* Dynamically cast a *sk* pointer to a *tcp_sock* pointer.
* Return
* *sk* if casting is valid, or NULL otherwise.
*
* struct tcp_timewait_sock *bpf_skc_to_tcp_timewait_sock(void *sk)
* Description
* Dynamically cast a *sk* pointer to a *tcp_timewait_sock* pointer.
* Return
* *sk* if casting is valid, or NULL otherwise.
*
* struct tcp_request_sock *bpf_skc_to_tcp_request_sock(void *sk)
* Description
* Dynamically cast a *sk* pointer to a *tcp_request_sock* pointer.
* Return
* *sk* if casting is valid, or NULL otherwise.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3399,7 +3417,10 @@ union bpf_attr {
FN(ringbuf_discard), \
FN(ringbuf_query), \
FN(csum_level), \
FN(skc_to_tcp6_sock),
FN(skc_to_tcp6_sock), \
FN(skc_to_tcp_sock), \
FN(skc_to_tcp_timewait_sock), \
FN(skc_to_tcp_request_sock),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call