bpf/progs/xdp_metadata.c

1 // SPDX-License-Identifier: GPL-2.0
30 SEC("xdp")
31 int rx(struct xdp_md *ctx)  in rx()  function
39 	u64 timestamp = -1;  in rx()
42 	data = (void *)(long)ctx->data;  in rx()
43 	data_end = (void *)(long)ctx->data_end;  in rx()
46 		if (eth->h_proto == bpf_htons(ETH_P_IP)) {  in rx()
48 			if (iph + 1 < data_end && iph->protocol == IPPROTO_UDP)  in rx()
51 		if (eth->h_proto == bpf_htons(ETH_P_IPV6)) {  in rx()
53 			if (ip6h + 1 < data_end && ip6h->nexthdr == IPPROTO_UDP)  in rx()
64 	if (udp->dest != bpf_htons(8080))  in rx()
67 	/* Reserve enough for all custom metadata. */  in rx()
69 	ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta));  in rx()
73 	data = (void *)(long)ctx->data;  in rx()
74 	data_meta = (void *)(long)ctx->data_meta;  in rx()
81 	/* Export metadata. */  in rx()
84 	 * timestamp, so put some non-zero value into AF_XDP frame for  in rx()
89 		meta->rx_timestamp = 1;  in rx()
91 	bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);  in rx()
92 	bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_proto,  in rx()
93 				     &meta->rx_vlan_tci);  in rx()
95 	return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);  in rx()