int bpf_prog2(struct __sk_buff *skb) { void *data_end = (void *)(long) skb->data_end; void *data = (void *)(long) skb->data; __u32 lport = skb->local_port; __u32 rport = skb->remote_port; __u8 *d = data; __u8 sk, map; if (data + 8 > data_end) return SK_DROP; map = d[0]; sk = d[1]; d[0] = 0xd; d[1] = 0xe; d[2] = 0xa; d[3] = 0xd; d[4] = 0xb; d[5] = 0xe; d[6] = 0xe; d[7] = 0xf; bpf_printk("verdict: data[0] = redir(%u:%u)\n", map, sk); if (!map) return bpf_sk_redirect_map(skb, &sock_map_rx, sk, 0); return bpf_sk_redirect_map(skb, &sock_map_tx, sk, 0); }
int bpf_prog2(struct __sk_buff *skb) { __u32 lport = skb->local_port; __u32 rport = skb->remote_port; int ret = 0; if (lport == 10000) ret = 10; else ret = 1; bpf_printk("sockmap: %d -> %d @ %d\n", lport, bpf_ntohl(rport), ret); return bpf_sk_redirect_map(&sock_map, ret, 0); }