Merge branch 'bpf-helper-improvements'

Daniel Borkmann says:

====================
BPF helper improvements

This set adds various BPF helper improvements, that is, cleaning
up and adding BPF_F_CURRENT_CPU flag for tracing helper, allowing
for preemption checks on bpf_get_smp_processor_id() helper, and
adding two new helpers bpf_skb_change_{proto, type} for tc related
programs. For further details please see individual patches.

Note, this set requires -net to be merged into -net-next tree first.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 1 deletions

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 406459b935a2..be6ac1291680 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -313,6 +313,29 @@ enum bpf_func_id {
          */
         BPF_FUNC_skb_get_tunnel_opt,
         BPF_FUNC_skb_set_tunnel_opt,
+
+        /**
+         * bpf_skb_change_proto(skb, proto, flags)
+         * Change protocol of the skb. Currently supported is
+         * v4 -> v6, v6 -> v4 transitions. The helper will also
+         * resize the skb. eBPF program is expected to fill the
+         * new headers via skb_store_bytes and lX_csum_replace.
+         * @skb: pointer to skb
+         * @proto: new skb->protocol type
+         * @flags: reserved
+         * Return: 0 on success or negative error
+         */
+        BPF_FUNC_skb_change_proto,
+
+        /**
+         * bpf_skb_change_type(skb, type)
+         * Change packet type of skb.
+         * @skb: pointer to skb
+         * @type: new skb->pkt_type type
+         * Return: 0 on success or negative error
+         */
+        BPF_FUNC_skb_change_type,
+
         __BPF_FUNC_MAX_ID,
 };
 
@@ -347,7 +370,7 @@ enum bpf_func_id {
 #define BPF_F_ZERO_CSUM_TX              (1ULL << 1)
 #define BPF_F_DONT_FRAGMENT             (1ULL << 2)
 
-/* BPF_FUNC_perf_event_output flags. */
+/* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */
 #define BPF_F_INDEX_MASK                0xffffffffULL
 #define BPF_F_CURRENT_CPU               BPF_F_INDEX_MASK