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Diffstat (limited to 'samples/bpf/xdp_rxq_info_kern.c')
-rw-r--r--samples/bpf/xdp_rxq_info_kern.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/samples/bpf/xdp_rxq_info_kern.c b/samples/bpf/xdp_rxq_info_kern.c
index 3fd209291653..61af6210df2f 100644
--- a/samples/bpf/xdp_rxq_info_kern.c
+++ b/samples/bpf/xdp_rxq_info_kern.c
@@ -4,6 +4,8 @@
* Example howto extract XDP RX-queue info
*/
#include <uapi/linux/bpf.h>
+#include <uapi/linux/if_ether.h>
+#include <uapi/linux/in.h>
#include "bpf_helpers.h"
/* Config setup from with userspace
@@ -14,6 +16,11 @@
struct config {
__u32 action;
int ifindex;
+ __u32 options;
+};
+enum cfg_options_flags {
+ NO_TOUCH = 0x0U,
+ READ_MEM = 0x1U,
};
struct bpf_map_def SEC("maps") config_map = {
.type = BPF_MAP_TYPE_ARRAY,
@@ -90,6 +97,18 @@ int xdp_prognum0(struct xdp_md *ctx)
if (key == MAX_RXQs)
rxq_rec->issue++;
+ /* Default: Don't touch packet data, only count packets */
+ if (unlikely(config->options & READ_MEM)) {
+ struct ethhdr *eth = data;
+
+ if (eth + 1 > data_end)
+ return XDP_ABORTED;
+
+ /* Avoid compiler removing this: Drop non 802.3 Ethertypes */
+ if (ntohs(eth->h_proto) < ETH_P_802_3_MIN)
+ return XDP_ABORTED;
+ }
+
return config->action;
}