mirror of
https://github.com/torvalds/linux
synced 2024-07-21 10:41:44 +00:00
7cf245a37e
Fix all files in samples/bpf to include libbpf header files with the bpf/
prefix, to be consistent with external users of the library. Also ensure
that all includes of exported libbpf header files (those that are exported
on 'make install' of the library) use bracketed includes instead of quoted.
To make sure no new files are introduced that doesn't include the bpf/
prefix in its include, remove tools/lib/bpf from the include path entirely,
and use tools/lib instead.
Fixes: 6910d7d386 ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/157952560911.1683545.8795966751309534150.stgit@toke.dk
238 lines
6 KiB
C
238 lines
6 KiB
C
/* Copyright (c) 2016 Facebook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*/
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#define KBUILD_MODNAME "foo"
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#include <uapi/linux/bpf.h>
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#include <uapi/linux/if_ether.h>
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#include <uapi/linux/if_packet.h>
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#include <uapi/linux/ip.h>
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#include <uapi/linux/ipv6.h>
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#include <uapi/linux/in.h>
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#include <uapi/linux/tcp.h>
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#include <uapi/linux/filter.h>
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#include <uapi/linux/pkt_cls.h>
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#include <net/ipv6.h>
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#include <bpf/bpf_helpers.h>
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#define _htonl __builtin_bswap32
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#define PIN_GLOBAL_NS 2
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struct bpf_elf_map {
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__u32 type;
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__u32 size_key;
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__u32 size_value;
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__u32 max_elem;
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__u32 flags;
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__u32 id;
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__u32 pinning;
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};
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/* copy of 'struct ethhdr' without __packed */
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struct eth_hdr {
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unsigned char h_dest[ETH_ALEN];
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unsigned char h_source[ETH_ALEN];
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unsigned short h_proto;
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};
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struct bpf_elf_map SEC("maps") tun_iface = {
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.type = BPF_MAP_TYPE_ARRAY,
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.size_key = sizeof(int),
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.size_value = sizeof(int),
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.pinning = PIN_GLOBAL_NS,
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.max_elem = 1,
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};
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static __always_inline bool is_vip_addr(__be16 eth_proto, __be32 daddr)
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{
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if (eth_proto == htons(ETH_P_IP))
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return (_htonl(0xffffff00) & daddr) == _htonl(0x0a0a0100);
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else if (eth_proto == htons(ETH_P_IPV6))
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return (daddr == _htonl(0x2401face));
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return false;
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}
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SEC("l2_to_iptun_ingress_forward")
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int _l2_to_iptun_ingress_forward(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key tkey = {};
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void *data = (void *)(long)skb->data;
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struct eth_hdr *eth = data;
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void *data_end = (void *)(long)skb->data_end;
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int key = 0, *ifindex;
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int ret;
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if (data + sizeof(*eth) > data_end)
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return TC_ACT_OK;
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ifindex = bpf_map_lookup_elem(&tun_iface, &key);
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if (!ifindex)
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return TC_ACT_OK;
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if (eth->h_proto == htons(ETH_P_IP)) {
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char fmt4[] = "ingress forward to ifindex:%d daddr4:%x\n";
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struct iphdr *iph = data + sizeof(*eth);
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if (data + sizeof(*eth) + sizeof(*iph) > data_end)
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return TC_ACT_OK;
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if (iph->protocol != IPPROTO_IPIP)
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return TC_ACT_OK;
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bpf_trace_printk(fmt4, sizeof(fmt4), *ifindex,
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_htonl(iph->daddr));
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return bpf_redirect(*ifindex, BPF_F_INGRESS);
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} else if (eth->h_proto == htons(ETH_P_IPV6)) {
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char fmt6[] = "ingress forward to ifindex:%d daddr6:%x::%x\n";
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struct ipv6hdr *ip6h = data + sizeof(*eth);
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if (data + sizeof(*eth) + sizeof(*ip6h) > data_end)
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return TC_ACT_OK;
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if (ip6h->nexthdr != IPPROTO_IPIP &&
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ip6h->nexthdr != IPPROTO_IPV6)
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return TC_ACT_OK;
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bpf_trace_printk(fmt6, sizeof(fmt6), *ifindex,
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_htonl(ip6h->daddr.s6_addr32[0]),
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_htonl(ip6h->daddr.s6_addr32[3]));
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return bpf_redirect(*ifindex, BPF_F_INGRESS);
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}
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return TC_ACT_OK;
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}
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SEC("l2_to_iptun_ingress_redirect")
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int _l2_to_iptun_ingress_redirect(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key tkey = {};
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void *data = (void *)(long)skb->data;
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struct eth_hdr *eth = data;
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void *data_end = (void *)(long)skb->data_end;
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int key = 0, *ifindex;
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int ret;
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if (data + sizeof(*eth) > data_end)
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return TC_ACT_OK;
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ifindex = bpf_map_lookup_elem(&tun_iface, &key);
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if (!ifindex)
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return TC_ACT_OK;
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if (eth->h_proto == htons(ETH_P_IP)) {
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char fmt4[] = "e/ingress redirect daddr4:%x to ifindex:%d\n";
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struct iphdr *iph = data + sizeof(*eth);
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__be32 daddr = iph->daddr;
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if (data + sizeof(*eth) + sizeof(*iph) > data_end)
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return TC_ACT_OK;
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if (!is_vip_addr(eth->h_proto, daddr))
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return TC_ACT_OK;
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bpf_trace_printk(fmt4, sizeof(fmt4), _htonl(daddr), *ifindex);
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} else {
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return TC_ACT_OK;
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}
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tkey.tunnel_id = 10000;
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tkey.tunnel_ttl = 64;
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tkey.remote_ipv4 = 0x0a020166; /* 10.2.1.102 */
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bpf_skb_set_tunnel_key(skb, &tkey, sizeof(tkey), 0);
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return bpf_redirect(*ifindex, 0);
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}
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SEC("l2_to_ip6tun_ingress_redirect")
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int _l2_to_ip6tun_ingress_redirect(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key tkey = {};
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void *data = (void *)(long)skb->data;
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struct eth_hdr *eth = data;
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void *data_end = (void *)(long)skb->data_end;
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int key = 0, *ifindex;
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if (data + sizeof(*eth) > data_end)
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return TC_ACT_OK;
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ifindex = bpf_map_lookup_elem(&tun_iface, &key);
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if (!ifindex)
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return TC_ACT_OK;
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if (eth->h_proto == htons(ETH_P_IP)) {
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char fmt4[] = "e/ingress redirect daddr4:%x to ifindex:%d\n";
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struct iphdr *iph = data + sizeof(*eth);
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if (data + sizeof(*eth) + sizeof(*iph) > data_end)
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return TC_ACT_OK;
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if (!is_vip_addr(eth->h_proto, iph->daddr))
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return TC_ACT_OK;
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bpf_trace_printk(fmt4, sizeof(fmt4), _htonl(iph->daddr),
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*ifindex);
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} else if (eth->h_proto == htons(ETH_P_IPV6)) {
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char fmt6[] = "e/ingress redirect daddr6:%x to ifindex:%d\n";
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struct ipv6hdr *ip6h = data + sizeof(*eth);
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if (data + sizeof(*eth) + sizeof(*ip6h) > data_end)
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return TC_ACT_OK;
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if (!is_vip_addr(eth->h_proto, ip6h->daddr.s6_addr32[0]))
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return TC_ACT_OK;
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bpf_trace_printk(fmt6, sizeof(fmt6),
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_htonl(ip6h->daddr.s6_addr32[0]), *ifindex);
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} else {
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return TC_ACT_OK;
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}
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tkey.tunnel_id = 10000;
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tkey.tunnel_ttl = 64;
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/* 2401:db02:0:0:0:0:0:66 */
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tkey.remote_ipv6[0] = _htonl(0x2401db02);
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tkey.remote_ipv6[1] = 0;
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tkey.remote_ipv6[2] = 0;
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tkey.remote_ipv6[3] = _htonl(0x00000066);
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bpf_skb_set_tunnel_key(skb, &tkey, sizeof(tkey), BPF_F_TUNINFO_IPV6);
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return bpf_redirect(*ifindex, 0);
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}
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SEC("drop_non_tun_vip")
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int _drop_non_tun_vip(struct __sk_buff *skb)
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{
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struct bpf_tunnel_key tkey = {};
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void *data = (void *)(long)skb->data;
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struct eth_hdr *eth = data;
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void *data_end = (void *)(long)skb->data_end;
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if (data + sizeof(*eth) > data_end)
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return TC_ACT_OK;
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if (eth->h_proto == htons(ETH_P_IP)) {
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struct iphdr *iph = data + sizeof(*eth);
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if (data + sizeof(*eth) + sizeof(*iph) > data_end)
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return TC_ACT_OK;
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if (is_vip_addr(eth->h_proto, iph->daddr))
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return TC_ACT_SHOT;
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} else if (eth->h_proto == htons(ETH_P_IPV6)) {
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struct ipv6hdr *ip6h = data + sizeof(*eth);
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if (data + sizeof(*eth) + sizeof(*ip6h) > data_end)
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return TC_ACT_OK;
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if (is_vip_addr(eth->h_proto, ip6h->daddr.s6_addr32[0]))
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return TC_ACT_SHOT;
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}
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return TC_ACT_OK;
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}
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char _license[] SEC("license") = "GPL";
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