1 // SPDX-License-Identifier: GPL-2.0 2 #define KBUILD_MODNAME "foo" 3 #include <string.h> 4 #include <linux/in.h> 5 #include <linux/if_ether.h> 6 #include <linux/if_packet.h> 7 #include <linux/ip.h> 8 #include <linux/ipv6.h> 9 10 #include <linux/bpf.h> 11 #include <bpf/bpf_helpers.h> 12 #include <bpf/bpf_endian.h> 13 14 /* One map use devmap, another one use devmap_hash for testing */ 15 struct { 16 __uint(type, BPF_MAP_TYPE_DEVMAP); 17 __uint(key_size, sizeof(int)); 18 __uint(value_size, sizeof(int)); 19 __uint(max_entries, 1024); 20 } map_all SEC(".maps"); 21 22 struct { 23 __uint(type, BPF_MAP_TYPE_DEVMAP_HASH); 24 __uint(key_size, sizeof(int)); 25 __uint(value_size, sizeof(struct bpf_devmap_val)); 26 __uint(max_entries, 128); 27 } map_egress SEC(".maps"); 28 29 /* map to store egress interfaces mac addresses */ 30 struct { 31 __uint(type, BPF_MAP_TYPE_HASH); 32 __type(key, __u32); 33 __type(value, __be64); 34 __uint(max_entries, 128); 35 } mac_map SEC(".maps"); 36 37 SEC("xdp") 38 int xdp_redirect_map_multi_prog(struct xdp_md *ctx) 39 { 40 void *data_end = (void *)(long)ctx->data_end; 41 void *data = (void *)(long)ctx->data; 42 int if_index = ctx->ingress_ifindex; 43 struct ethhdr *eth = data; 44 __u16 h_proto; 45 __u64 nh_off; 46 47 nh_off = sizeof(*eth); 48 if (data + nh_off > data_end) 49 return XDP_DROP; 50 51 h_proto = eth->h_proto; 52 53 /* Using IPv4 for (BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS) testing */ 54 if (h_proto == bpf_htons(ETH_P_IP)) 55 return bpf_redirect_map(&map_all, 0, 56 BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS); 57 /* Using IPv6 for none flag testing */ 58 else if (h_proto == bpf_htons(ETH_P_IPV6)) 59 return bpf_redirect_map(&map_all, if_index, 0); 60 /* All others for BPF_F_BROADCAST testing */ 61 else 62 return bpf_redirect_map(&map_all, 0, BPF_F_BROADCAST); 63 } 64 65 /* The following 2 progs are for 2nd devmap prog testing */ 66 SEC("xdp") 67 int xdp_redirect_map_all_prog(struct xdp_md *ctx) 68 { 69 return bpf_redirect_map(&map_egress, 0, 70 BPF_F_BROADCAST | BPF_F_EXCLUDE_INGRESS); 71 } 72 73 SEC("xdp/devmap") 74 int xdp_devmap_prog(struct xdp_md *ctx) 75 { 76 void *data_end = (void *)(long)ctx->data_end; 77 void *data = (void *)(long)ctx->data; 78 __u32 key = ctx->egress_ifindex; 79 struct ethhdr *eth = data; 80 __u64 nh_off; 81 __be64 *mac; 82 83 nh_off = sizeof(*eth); 84 if (data + nh_off > data_end) 85 return XDP_DROP; 86 87 mac = bpf_map_lookup_elem(&mac_map, &key); 88 if (mac) 89 __builtin_memcpy(eth->h_source, mac, ETH_ALEN); 90 91 return XDP_PASS; 92 } 93 94 char _license[] SEC("license") = "GPL"; 95