1 // SPDX-License-Identifier: GPL-2.0
3 #include <bpf/bpf_helpers.h>
4 #include <bpf/bpf_endian.h>
8 #include <linux/if_ether.h>
9 #include <linux/pkt_cls.h>
16 #define CUR_NS BPF_F_CURRENT_NETNS
18 static void socket_lookup(void *ctx, void *data_end, void *data)
20 struct ethhdr *eth = data;
21 struct bpf_sock_tuple *tp;
26 if (eth + 1 > data_end)
29 if (eth->h_proto != bpf_htons(ETH_P_IP))
32 iph = (struct iphdr *)(eth + 1);
33 if (iph + 1 > data_end)
36 tp = (struct bpf_sock_tuple *)&iph->saddr;
37 tplen = sizeof(tp->ipv4);
38 if ((void *)tp + tplen > data_end)
41 switch (iph->protocol) {
44 sk = bpf_skc_lookup_tcp(ctx, tp, tplen, CUR_NS, 0);
46 sk = bpf_sk_lookup_tcp(ctx, tp, tplen, CUR_NS, 0);
49 sk = bpf_sk_lookup_udp(ctx, tp, tplen, CUR_NS, 0);
64 int tc_socket_lookup(struct __sk_buff *skb)
66 void *data_end = (void *)(long)skb->data_end;
67 void *data = (void *)(long)skb->data;
72 socket_lookup(skb, data_end, data);
77 int xdp_socket_lookup(struct xdp_md *xdp)
79 void *data_end = (void *)(long)xdp->data_end;
80 void *data = (void *)(long)xdp->data;
85 socket_lookup(xdp, data_end, data);
89 char _license[] SEC("license") = "GPL";