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bpf: Add bpf_skc_to_udp6_sock() helper

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The helper is used in tracing programs to cast a socket
pointer to a udp6_sock pointer.
The return value could be NULL if the casting is illegal.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Cc: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/bpf/20200623230815.3988481-1-yhs@fb.com
This commit is contained in:
Yonghong Song
2020-06-23 16:08:15 -07:00
committed by Alexei Starovoitov
parent 5788b3a07f
commit 0d4fad3e57
6 changed files with 43 additions and 2 deletions
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9
include/uapi/linux/bpf.h
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@@ -3279,6 +3279,12 @@ union bpf_attr {
* Dynamically cast a *sk* pointer to a *tcp_request_sock* pointer.
* Return
* *sk* if casting is valid, or NULL otherwise.
*
* struct udp6_sock *bpf_skc_to_udp6_sock(void *sk)
* Description
* Dynamically cast a *sk* pointer to a *udp6_sock* pointer.
* Return
* *sk* if casting is valid, or NULL otherwise.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -3420,7 +3426,8 @@ union bpf_attr {
FN(skc_to_tcp6_sock), \
FN(skc_to_tcp_sock), \
FN(skc_to_tcp_timewait_sock), \
FN(skc_to_tcp_request_sock),
FN(skc_to_tcp_request_sock), \
FN(skc_to_udp6_sock),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call