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authorJohn Fastabend <john.fastabend@gmail.com>2018-11-26 14:16:18 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2018-11-28 22:07:57 +0100
commitd913a2273a8988cd810a031bfa08249ca7dd5f7c (patch)
treebe3f03a3f06771d4398d7e4afa2e543c1f5e9372 /tools
parentbpf: helper to pop data from messages (diff)
downloadlinux-dev-d913a2273a8988cd810a031bfa08249ca7dd5f7c.tar.xz
linux-dev-d913a2273a8988cd810a031bfa08249ca7dd5f7c.zip
bpf: add msg_pop_data helper to tools
Add the necessary header definitions to tools for new msg_pop_data_helper. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools')
-rw-r--r--tools/include/uapi/linux/bpf.h16
-rw-r--r--tools/testing/selftests/bpf/bpf_helpers.h2
2 files changed, 17 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 23e2031a43d4..597afdbc1ab9 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -2268,6 +2268,19 @@ union bpf_attr {
*
* Return
* 0 on success, or a negative error in case of failure.
+ *
+ * int bpf_msg_pop_data(struct sk_msg_buff *msg, u32 start, u32 pop, u64 flags)
+ * Description
+ * Will remove *pop* bytes from a *msg* starting at byte *start*.
+ * This may result in **ENOMEM** errors under certain situations if
+ * an allocation and copy are required due to a full ring buffer.
+ * However, the helper will try to avoid doing the allocation
+ * if possible. Other errors can occur if input parameters are
+ * invalid either due to *start* byte not being valid part of msg
+ * payload and/or *pop* value being to large.
+ *
+ * Return
+ * 0 on success, or a negative erro in case of failure.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -2360,7 +2373,8 @@ union bpf_attr {
FN(map_push_elem), \
FN(map_pop_elem), \
FN(map_peek_elem), \
- FN(msg_push_data),
+ FN(msg_push_data), \
+ FN(msg_pop_data),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call
diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
index 686e57ce40f4..7b69519a09b1 100644
--- a/tools/testing/selftests/bpf/bpf_helpers.h
+++ b/tools/testing/selftests/bpf/bpf_helpers.h
@@ -113,6 +113,8 @@ static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) =
(void *) BPF_FUNC_msg_pull_data;
static int (*bpf_msg_push_data)(void *ctx, int start, int end, int flags) =
(void *) BPF_FUNC_msg_push_data;
+static int (*bpf_msg_pop_data)(void *ctx, int start, int cut, int flags) =
+ (void *) BPF_FUNC_msg_pop_data;
static int (*bpf_bind)(void *ctx, void *addr, int addr_len) =
(void *) BPF_FUNC_bind;
static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) =