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| author | Yonghong Song <yhs@fb.com> | 2020-06-24 01:08:09 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-06-25 03:37:59 +0200 |
| commit | af7ec13833619e17f03aa73a785a2f871da6d66b (patch) | |
| tree | 80a186e36a8007eeebb720adca3d59654d31fe86 /scripts | |
| parent | bpf: Allow tracing programs to use bpf_jiffies64() helper (diff) | |
| download | linux-af7ec13833619e17f03aa73a785a2f871da6d66b.tar.xz linux-af7ec13833619e17f03aa73a785a2f871da6d66b.zip | |
bpf: Add bpf_skc_to_tcp6_sock() helper
The helper is used in tracing programs to cast a socket
pointer to a tcp6_sock pointer.
The return value could be NULL if the casting is illegal.
A new helper return type RET_PTR_TO_BTF_ID_OR_NULL is added
so the verifier is able to deduce proper return types for the helper.
Different from the previous BTF_ID based helpers,
the bpf_skc_to_tcp6_sock() argument can be several possible
btf_ids. More specifically, all possible socket data structures
with sock_common appearing in the first in the memory layout.
This patch only added socket types related to tcp and udp.
All possible argument btf_id and return value btf_id
for helper bpf_skc_to_tcp6_sock() are pre-calculcated and
cached. In the future, it is even possible to precompute
these btf_id's at kernel build time.
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200623230809.3988195-1-yhs@fb.com
Diffstat (limited to 'scripts')
| -rwxr-xr-x | scripts/bpf_helpers_doc.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/scripts/bpf_helpers_doc.py b/scripts/bpf_helpers_doc.py index 91fa668fa860..6c2f64118651 100755 --- a/scripts/bpf_helpers_doc.py +++ b/scripts/bpf_helpers_doc.py @@ -421,6 +421,7 @@ class PrinterHelpers(Printer): 'struct sockaddr', 'struct tcphdr', 'struct seq_file', + 'struct tcp6_sock', 'struct __sk_buff', 'struct sk_msg_md', @@ -458,6 +459,7 @@ class PrinterHelpers(Printer): 'struct sockaddr', 'struct tcphdr', 'struct seq_file', + 'struct tcp6_sock', } mapped_types = { 'u8': '__u8', |