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authorYonghong Song <yhs@fb.com>2020-06-23 16:08:09 -0700
committerAlexei Starovoitov <ast@kernel.org>2020-06-24 18:37:59 -0700
commitaf7ec13833619e17f03aa73a785a2f871da6d66b (patch)
tree80a186e36a8007eeebb720adca3d59654d31fe86 /scripts
parent72e2b2b66f9c1225e51fc4a1c1e8512959195b76 (diff)
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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-xscripts/bpf_helpers_doc.py2
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',