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authorDaniel Borkmann <daniel@iogearbox.net>2017-06-11 00:50:47 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-10 19:05:47 -0400
commitded092cd73c2c56a394b936f86897f29b2e131c0 (patch)
treed8fc58484a521feb4eeb19bbb332e00148efe51e /tools
parent966789fb8636a35c3263076fea382263c5e56802 (diff)
bpf: add bpf_set_hash helper for tc progs
Allow for tc BPF programs to set a skb->hash, apart from clearing and triggering a recalc that we have right now. It allows for BPF to implement a custom hashing routine for skb_get_hash(). Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools')
-rw-r--r--tools/include/uapi/linux/bpf.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
index 9b2c10b45733..f94b48b168dc 100644
--- a/tools/include/uapi/linux/bpf.h
+++ b/tools/include/uapi/linux/bpf.h
@@ -513,6 +513,11 @@ union bpf_attr {
* Get the owner uid of the socket stored inside sk_buff.
* @skb: pointer to skb
* Return: uid of the socket owner on success or overflowuid if failed.
+ *
+ * u32 bpf_set_hash(skb, hash)
+ * Set full skb->hash.
+ * @skb: pointer to skb
+ * @hash: hash to set
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@@ -562,7 +567,8 @@ union bpf_attr {
FN(xdp_adjust_head), \
FN(probe_read_str), \
FN(get_socket_cookie), \
- FN(get_socket_uid),
+ FN(get_socket_uid), \
+ FN(set_hash),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call