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authorJohn Fastabend <john.fastabend@gmail.com>2018-10-19 19:56:50 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-10-20 21:37:12 +0200
commitf908d26b2c41d9a924371099c4979e4b5d385165 (patch)
treeda4325dd974dcb244f295b4a4935b597a6d1587a /tools/include
parent6fff607e2f14bd7c63c06c464a6f93b8efbabe28 (diff)
downloadlinux-f908d26b2c41d9a924371099c4979e4b5d385165.tar.bz2
bpf: libbpf support for msg_push_data
Add support for new bpf_msg_push_data in libbpf. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/include')
-rw-r--r--tools/include/uapi/linux/bpf.h20
1 files changed, 19 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index a2fb333290dc..852dc17ab47a 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2240,6 +2240,23 @@ union bpf_attr {
* pointer that was returned from bpf_sk_lookup_xxx\ ().
* Return
* 0 on success, or a negative error in case of failure.
+ *
+ * int bpf_msg_push_data(struct sk_buff *skb, u32 start, u32 len, u64 flags)
+ * Description
+ * For socket policies, insert *len* bytes into msg at offset
+ * *start*.
+ *
+ * If a program of type **BPF_PROG_TYPE_SK_MSG** is run on a
+ * *msg* it may want to insert metadata or options into the msg.
+ * This can later be read and used by any of the lower layer BPF
+ * hooks.
+ *
+ * This helper may fail if under memory pressure (a malloc
+ * fails) in these cases BPF programs will get an appropriate
+ * error and BPF programs will need to handle them.
+ *
+ * Return
+ * 0 on success, or a negative error in case of failure.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -2331,7 +2348,8 @@ union bpf_attr {
FN(sk_release), \
FN(map_push_elem), \
FN(map_pop_elem), \
- FN(map_peek_elem),
+ FN(map_peek_elem), \
+ FN(msg_push_data),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call