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you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include <stddef.h> #include <string.h> #include <arpa/inet.h> #include <linux/bpf.h> #include <linux/if_ether.h> #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; __u8 length:5; __u8 r3:1; __u8 r2:1; __u8 r1:1; __u8 opt_data[8]; /* hard-coded to 8 byte */ }; struct vxlanhdr { __be32 vx_flags; __be32 vx_vni; } __attribute__((packed)); struct vxlan_metadata { __u32 gbp; }; struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(max_entries, 1); __type(key, __u32); __type(value, __u32); } local_ip_map SEC(".maps"); SEC("tc") int gre_set_tunnel(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; __builtin_memset(&key, 0x0, sizeof(key)); key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ key.tunnel_id = 2; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX | BPF_F_SEQ_NUMBER); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int gre_get_tunnel(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } bpf_printk("key %d remote ip 0x%x\n", key.tunnel_id, key.remote_ipv4); return TC_ACT_OK; } SEC("tc") int ip6gretap_set_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; int ret; __builtin_memset(&key, 0x0, sizeof(key)); key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */ key.tunnel_id = 2; key.tunnel_tos = 0; key.tunnel_ttl = 64; key.tunnel_label = 0xabcde; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | BPF_F_SEQ_NUMBER); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ip6gretap_get_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; int ret; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } bpf_printk("key %d remote ip6 ::%x label %x\n", key.tunnel_id, key.remote_ipv6[3], key.tunnel_label); return TC_ACT_OK; } SEC("tc") int erspan_set_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; struct erspan_metadata md; int ret; __builtin_memset(&key, 0x0, sizeof(key)); key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ key.tunnel_id = 2; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } __builtin_memset(&md, 0, sizeof(md)); #ifdef ERSPAN_V1 md.version = 1; md.u.index = bpf_htonl(123); #else __u8 direction = 1; __u8 hwid = 7; md.version = 2; md.u.md2.dir = direction; md.u.md2.hwid = hwid & 0xf; md.u.md2.hwid_upper = (hwid >> 4) & 0x3; #endif ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int erspan_get_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; struct erspan_metadata md; __u32 index; int ret; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } bpf_printk("key %d remote ip 0x%x erspan version %d\n", key.tunnel_id, key.remote_ipv4, md.version); #ifdef ERSPAN_V1 index = bpf_ntohl(md.u.index); bpf_printk("\tindex %x\n", index); #else bpf_printk("\tdirection %d hwid %x timestamp %u\n", md.u.md2.dir, (md.u.md2.hwid_upper << 4) + md.u.md2.hwid, bpf_ntohl(md.u.md2.timestamp)); #endif return TC_ACT_OK; } SEC("tc") int ip4ip6erspan_set_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; struct erspan_metadata md; int ret; __builtin_memset(&key, 0x0, sizeof(key)); key.remote_ipv6[3] = bpf_htonl(0x11); key.tunnel_id = 2; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } __builtin_memset(&md, 0, sizeof(md)); #ifdef ERSPAN_V1 md.u.index = bpf_htonl(123); md.version = 1; #else __u8 direction = 0; __u8 hwid = 17; md.version = 2; md.u.md2.dir = direction; md.u.md2.hwid = hwid & 0xf; md.u.md2.hwid_upper = (hwid >> 4) & 0x3; #endif ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ip4ip6erspan_get_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; struct erspan_metadata md; __u32 index; int ret; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } bpf_printk("ip6erspan get key %d remote ip6 ::%x erspan version %d\n", key.tunnel_id, key.remote_ipv4, md.version); #ifdef ERSPAN_V1 index = bpf_ntohl(md.u.index); bpf_printk("\tindex %x\n", index); #else bpf_printk("\tdirection %d hwid %x timestamp %u\n", md.u.md2.dir, (md.u.md2.hwid_upper << 4) + md.u.md2.hwid, bpf_ntohl(md.u.md2.timestamp)); #endif return TC_ACT_OK; } SEC("tc") int vxlan_set_tunnel_dst(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; struct vxlan_metadata md; __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; } __builtin_memset(&key, 0x0, sizeof(key)); key.local_ipv4 = 0xac100164; /* 172.16.1.100 */ key.remote_ipv4 = *local_ip; key.tunnel_id = 2; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } md.gbp = 0x800FF; /* Set VXLAN Group Policy extension */ ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int vxlan_set_tunnel_src(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; struct vxlan_metadata md; __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; } __builtin_memset(&key, 0x0, sizeof(key)); key.local_ipv4 = *local_ip; key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ key.tunnel_id = 2; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } md.gbp = 0x800FF; /* Set VXLAN Group Policy extension */ ret = bpf_skb_set_tunnel_opt(skb, &md, sizeof(md)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") 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; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } ret = bpf_skb_get_tunnel_opt(skb, &md, sizeof(md)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } 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); log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } 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; int ret; __u32 index = 0; __u32 *local_ip; local_ip = bpf_map_lookup_elem(&local_ip_map, &index); if (!local_ip) { log_err(ret); return TC_ACT_SHOT; } __builtin_memset(&key, 0x0, sizeof(key)); key.local_ipv6[3] = bpf_htonl(0x11); /* ::11 */ key.remote_ipv6[3] = bpf_htonl(*local_ip); key.tunnel_id = 22; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ip6vxlan_set_tunnel_src(struct __sk_buff *skb) { struct bpf_tunnel_key key; int ret; __u32 index = 0; __u32 *local_ip; local_ip = bpf_map_lookup_elem(&local_ip_map, &index); if (!local_ip) { log_err(ret); return TC_ACT_SHOT; } __builtin_memset(&key, 0x0, sizeof(key)); key.local_ipv6[3] = bpf_htonl(*local_ip); key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */ key.tunnel_id = 22; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ip6vxlan_get_tunnel_src(struct __sk_buff *skb) { struct bpf_tunnel_key key; int ret; __u32 index = 0; __u32 *local_ip; 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), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } if (bpf_ntohl(key.local_ipv6[3]) != *local_ip) { bpf_printk("ip6vxlan key %d local ip6 ::%x remote ip6 ::%x label 0x%x\n", key.tunnel_id, bpf_ntohl(key.local_ipv6[3]), bpf_ntohl(key.remote_ipv6[3]), key.tunnel_label); bpf_printk("local_ip 0x%x\n", *local_ip); log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int geneve_set_tunnel(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; struct geneve_opt gopt; __builtin_memset(&key, 0x0, sizeof(key)); key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ key.tunnel_id = 2; key.tunnel_tos = 0; key.tunnel_ttl = 64; __builtin_memset(&gopt, 0x0, sizeof(gopt)); gopt.opt_class = bpf_htons(0x102); /* Open Virtual Networking (OVN) */ gopt.type = 0x08; gopt.r1 = 0; gopt.r2 = 0; gopt.r3 = 0; gopt.length = 2; /* 4-byte multiple */ *(int *) &gopt.opt_data = bpf_htonl(0xdeadbeef); ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_ZERO_CSUM_TX); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } ret = bpf_skb_set_tunnel_opt(skb, &gopt, sizeof(gopt)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int geneve_get_tunnel(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; struct geneve_opt gopt; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt)); if (ret < 0) gopt.opt_class = 0; bpf_printk("key %d remote ip 0x%x geneve class 0x%x\n", key.tunnel_id, key.remote_ipv4, gopt.opt_class); return TC_ACT_OK; } SEC("tc") int ip6geneve_set_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; struct geneve_opt gopt; int ret; __builtin_memset(&key, 0x0, sizeof(key)); key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */ key.tunnel_id = 22; key.tunnel_tos = 0; key.tunnel_ttl = 64; ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } __builtin_memset(&gopt, 0x0, sizeof(gopt)); gopt.opt_class = bpf_htons(0x102); /* Open Virtual Networking (OVN) */ gopt.type = 0x08; gopt.r1 = 0; gopt.r2 = 0; gopt.r3 = 0; gopt.length = 2; /* 4-byte multiple */ *(int *) &gopt.opt_data = bpf_htonl(0xfeedbeef); ret = bpf_skb_set_tunnel_opt(skb, &gopt, sizeof(gopt)); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ip6geneve_get_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key; struct geneve_opt gopt; int ret; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } ret = bpf_skb_get_tunnel_opt(skb, &gopt, sizeof(gopt)); if (ret < 0) gopt.opt_class = 0; bpf_printk("key %d remote ip 0x%x geneve class 0x%x\n", key.tunnel_id, key.remote_ipv4, gopt.opt_class); return TC_ACT_OK; } SEC("tc") int ipip_set_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key = {}; void *data = (void *)(long)skb->data; struct iphdr *iph = data; void *data_end = (void *)(long)skb->data_end; int ret; /* single length check */ if (data + sizeof(*iph) > data_end) { log_err(1); return TC_ACT_SHOT; } key.tunnel_ttl = 64; if (iph->protocol == IPPROTO_ICMP) { key.remote_ipv4 = 0xac100164; /* 172.16.1.100 */ } ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), 0); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ipip_get_tunnel(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), 0); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } bpf_printk("remote ip 0x%x\n", key.remote_ipv4); return TC_ACT_OK; } SEC("tc") int ipip6_set_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key = {}; void *data = (void *)(long)skb->data; struct iphdr *iph = data; void *data_end = (void *)(long)skb->data_end; int ret; /* single length check */ if (data + sizeof(*iph) > data_end) { log_err(1); return TC_ACT_SHOT; } __builtin_memset(&key, 0x0, sizeof(key)); key.tunnel_ttl = 64; if (iph->protocol == IPPROTO_ICMP) { key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */ } ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ipip6_get_tunnel(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } bpf_printk("remote ip6 %x::%x\n", bpf_htonl(key.remote_ipv6[0]), bpf_htonl(key.remote_ipv6[3])); return TC_ACT_OK; } SEC("tc") int ip6ip6_set_tunnel(struct __sk_buff *skb) { struct bpf_tunnel_key key = {}; void *data = (void *)(long)skb->data; struct ipv6hdr *iph = data; void *data_end = (void *)(long)skb->data_end; int ret; /* single length check */ if (data + sizeof(*iph) > data_end) { log_err(1); return TC_ACT_SHOT; } key.tunnel_ttl = 64; if (iph->nexthdr == 58 /* NEXTHDR_ICMP */) { key.remote_ipv6[3] = bpf_htonl(0x11); /* ::11 */ } ret = bpf_skb_set_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } return TC_ACT_OK; } SEC("tc") int ip6ip6_get_tunnel(struct __sk_buff *skb) { int ret; struct bpf_tunnel_key key; ret = bpf_skb_get_tunnel_key(skb, &key, sizeof(key), BPF_F_TUNINFO_IPV6); if (ret < 0) { log_err(ret); return TC_ACT_SHOT; } bpf_printk("remote ip6 %x::%x\n", bpf_htonl(key.remote_ipv6[0]), bpf_htonl(key.remote_ipv6[3])); return TC_ACT_OK; } SEC("tc") int xfrm_get_state(struct __sk_buff *skb) { struct bpf_xfrm_state x; int ret; ret = bpf_skb_get_xfrm_state(skb, 0, &x, sizeof(x), 0); if (ret < 0) return TC_ACT_OK; bpf_printk("reqid %d spi 0x%x remote ip 0x%x\n", x.reqid, bpf_ntohl(x.spi), bpf_ntohl(x.remote_ipv4)); return TC_ACT_OK; } char _license[] SEC("license") = "GPL"; |