diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_tunnel_kern.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_tunnel_kern.c | 80 |
1 files changed, 71 insertions, 9 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c index 17f2f325b3f3..df0673c4ecbe 100644 --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c @@ -14,15 +14,24 @@ #include <linux/if_packet.h> #include <linux/ip.h> #include <linux/ipv6.h> +#include <linux/icmp.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/pkt_cls.h> #include <linux/erspan.h> +#include <linux/udp.h> #include <bpf/bpf_helpers.h> #include <bpf/bpf_endian.h> #define log_err(__ret) bpf_printk("ERROR line:%d ret:%d\n", __LINE__, __ret) +#define VXLAN_UDP_PORT 4789 + +/* Only IPv4 address assigned to veth1. + * 172.16.1.200 + */ +#define ASSIGNED_ADDR_VETH1 0xac1001c8 + struct geneve_opt { __be16 opt_class; __u8 type; @@ -33,6 +42,11 @@ struct geneve_opt { __u8 opt_data[8]; /* hard-coded to 8 byte */ }; +struct vxlanhdr { + __be32 vx_flags; + __be32 vx_vni; +} __attribute__((packed)); + struct vxlan_metadata { __u32 gbp; }; @@ -369,14 +383,8 @@ int vxlan_get_tunnel_src(struct __sk_buff *skb) int ret; struct bpf_tunnel_key key; struct vxlan_metadata md; + __u32 orig_daddr; __u32 index = 0; - __u32 *local_ip = NULL; - - local_ip = bpf_map_lookup_elem(&local_ip_map, &index); - if (!local_ip) { - log_err(ret); - return TC_ACT_SHOT; - } ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); if (ret < 0) { @@ -390,11 +398,10 @@ int vxlan_get_tunnel_src(struct __sk_buff *skb) return TC_ACT_SHOT; } - if (key.local_ipv4 != *local_ip || md.gbp != 0x800FF) { + if (key.local_ipv4 != ASSIGNED_ADDR_VETH1 || md.gbp != 0x800FF) { bpf_printk("vxlan key %d local ip 0x%x remote ip 0x%x gbp 0x%x\n", key.tunnel_id, key.local_ipv4, key.remote_ipv4, md.gbp); - bpf_printk("local_ip 0x%x\n", *local_ip); log_err(ret); return TC_ACT_SHOT; } @@ -403,6 +410,61 @@ int vxlan_get_tunnel_src(struct __sk_buff *skb) } SEC("tc") +int veth_set_outer_dst(struct __sk_buff *skb) +{ + struct ethhdr *eth = (struct ethhdr *)(long)skb->data; + __u32 assigned_ip = bpf_htonl(ASSIGNED_ADDR_VETH1); + void *data_end = (void *)(long)skb->data_end; + struct udphdr *udph; + struct iphdr *iph; + __u32 index = 0; + int ret = 0; + int shrink; + __s64 csum; + + if ((void *)eth + sizeof(*eth) > data_end) { + log_err(ret); + return TC_ACT_SHOT; + } + + if (eth->h_proto != bpf_htons(ETH_P_IP)) + return TC_ACT_OK; + + iph = (struct iphdr *)(eth + 1); + if ((void *)iph + sizeof(*iph) > data_end) { + log_err(ret); + return TC_ACT_SHOT; + } + if (iph->protocol != IPPROTO_UDP) + return TC_ACT_OK; + + udph = (struct udphdr *)(iph + 1); + if ((void *)udph + sizeof(*udph) > data_end) { + log_err(ret); + return TC_ACT_SHOT; + } + if (udph->dest != bpf_htons(VXLAN_UDP_PORT)) + return TC_ACT_OK; + + if (iph->daddr != assigned_ip) { + csum = bpf_csum_diff(&iph->daddr, sizeof(__u32), &assigned_ip, + sizeof(__u32), 0); + if (bpf_skb_store_bytes(skb, ETH_HLEN + offsetof(struct iphdr, daddr), + &assigned_ip, sizeof(__u32), 0) < 0) { + log_err(ret); + return TC_ACT_SHOT; + } + if (bpf_l3_csum_replace(skb, ETH_HLEN + offsetof(struct iphdr, check), + 0, csum, 0) < 0) { + log_err(ret); + return TC_ACT_SHOT; + } + bpf_skb_change_type(skb, PACKET_HOST); + } + return TC_ACT_OK; +} + +SEC("tc") int ip6vxlan_set_tunnel_dst(struct __sk_buff *skb) { struct bpf_tunnel_key key; |