99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <vmlinux.h>
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#include "xdp_metadata.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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struct {
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__uint(type, BPF_MAP_TYPE_XSKMAP);
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__uint(max_entries, 4);
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__type(key, __u32);
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__type(value, __u32);
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} xsk SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u32);
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} prog_arr SEC(".maps");
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extern int bpf_xdp_metadata_rx_timestamp(const struct xdp_md *ctx,
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__u64 *timestamp) __ksym;
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extern int bpf_xdp_metadata_rx_hash(const struct xdp_md *ctx, __u32 *hash,
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enum xdp_rss_hash_type *rss_type) __ksym;
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extern int bpf_xdp_metadata_rx_vlan_tag(const struct xdp_md *ctx,
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__be16 *vlan_proto,
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__u16 *vlan_tci) __ksym;
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SEC("xdp")
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int rx(struct xdp_md *ctx)
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{
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void *data, *data_meta, *data_end;
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struct ipv6hdr *ip6h = NULL;
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struct ethhdr *eth = NULL;
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struct udphdr *udp = NULL;
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struct iphdr *iph = NULL;
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struct xdp_meta *meta;
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u64 timestamp = -1;
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int ret;
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data = (void *)(long)ctx->data;
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data_end = (void *)(long)ctx->data_end;
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eth = data;
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if (eth + 1 < data_end) {
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if (eth->h_proto == bpf_htons(ETH_P_IP)) {
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iph = (void *)(eth + 1);
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if (iph + 1 < data_end && iph->protocol == IPPROTO_UDP)
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udp = (void *)(iph + 1);
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}
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if (eth->h_proto == bpf_htons(ETH_P_IPV6)) {
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ip6h = (void *)(eth + 1);
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if (ip6h + 1 < data_end && ip6h->nexthdr == IPPROTO_UDP)
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udp = (void *)(ip6h + 1);
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}
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if (udp && udp + 1 > data_end)
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udp = NULL;
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}
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if (!udp)
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return XDP_PASS;
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/* Forwarding UDP:8080 to AF_XDP */
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if (udp->dest != bpf_htons(8080))
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return XDP_PASS;
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/* Reserve enough for all custom metadata. */
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ret = bpf_xdp_adjust_meta(ctx, -(int)sizeof(struct xdp_meta));
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if (ret != 0)
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return XDP_DROP;
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data = (void *)(long)ctx->data;
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data_meta = (void *)(long)ctx->data_meta;
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if (data_meta + sizeof(struct xdp_meta) > data)
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return XDP_DROP;
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meta = data_meta;
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/* Export metadata. */
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/* We expect veth bpf_xdp_metadata_rx_timestamp to return 0 HW
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* timestamp, so put some non-zero value into AF_XDP frame for
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* the userspace.
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*/
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bpf_xdp_metadata_rx_timestamp(ctx, ×tamp);
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if (timestamp == 0)
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meta->rx_timestamp = 1;
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bpf_xdp_metadata_rx_hash(ctx, &meta->rx_hash, &meta->rx_hash_type);
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bpf_xdp_metadata_rx_vlan_tag(ctx, &meta->rx_vlan_proto,
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&meta->rx_vlan_tci);
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return bpf_redirect_map(&xsk, ctx->rx_queue_index, XDP_PASS);
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}
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char _license[] SEC("license") = "GPL";
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