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223 lines
4.8 KiB
223 lines
4.8 KiB
#include <uapi/linux/bpf.h> |
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#include <uapi/linux/in.h> |
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#include <uapi/linux/if.h> |
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#include <uapi/linux/if_ether.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/if_tunnel.h> |
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#include <bpf/bpf_helpers.h> |
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#include "bpf_legacy.h" |
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#define IP_MF 0x2000 |
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#define IP_OFFSET 0x1FFF |
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struct vlan_hdr { |
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__be16 h_vlan_TCI; |
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__be16 h_vlan_encapsulated_proto; |
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}; |
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struct flow_key_record { |
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__be32 src; |
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__be32 dst; |
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union { |
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__be32 ports; |
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__be16 port16[2]; |
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}; |
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__u16 thoff; |
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__u8 ip_proto; |
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}; |
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static inline int proto_ports_offset(__u64 proto) |
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{ |
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switch (proto) { |
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case IPPROTO_TCP: |
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case IPPROTO_UDP: |
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case IPPROTO_DCCP: |
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case IPPROTO_ESP: |
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case IPPROTO_SCTP: |
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case IPPROTO_UDPLITE: |
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return 0; |
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case IPPROTO_AH: |
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return 4; |
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default: |
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return 0; |
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} |
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} |
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static inline int ip_is_fragment(struct __sk_buff *ctx, __u64 nhoff) |
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{ |
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return load_half(ctx, nhoff + offsetof(struct iphdr, frag_off)) |
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& (IP_MF | IP_OFFSET); |
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} |
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static inline __u32 ipv6_addr_hash(struct __sk_buff *ctx, __u64 off) |
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{ |
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__u64 w0 = load_word(ctx, off); |
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__u64 w1 = load_word(ctx, off + 4); |
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__u64 w2 = load_word(ctx, off + 8); |
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__u64 w3 = load_word(ctx, off + 12); |
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return (__u32)(w0 ^ w1 ^ w2 ^ w3); |
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} |
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static inline __u64 parse_ip(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto, |
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struct flow_key_record *flow) |
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{ |
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__u64 verlen; |
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if (unlikely(ip_is_fragment(skb, nhoff))) |
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*ip_proto = 0; |
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else |
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*ip_proto = load_byte(skb, nhoff + offsetof(struct iphdr, protocol)); |
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if (*ip_proto != IPPROTO_GRE) { |
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flow->src = load_word(skb, nhoff + offsetof(struct iphdr, saddr)); |
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flow->dst = load_word(skb, nhoff + offsetof(struct iphdr, daddr)); |
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} |
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verlen = load_byte(skb, nhoff + 0/*offsetof(struct iphdr, ihl)*/); |
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if (likely(verlen == 0x45)) |
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nhoff += 20; |
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else |
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nhoff += (verlen & 0xF) << 2; |
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return nhoff; |
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} |
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static inline __u64 parse_ipv6(struct __sk_buff *skb, __u64 nhoff, __u64 *ip_proto, |
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struct flow_key_record *flow) |
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{ |
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*ip_proto = load_byte(skb, |
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nhoff + offsetof(struct ipv6hdr, nexthdr)); |
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flow->src = ipv6_addr_hash(skb, |
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nhoff + offsetof(struct ipv6hdr, saddr)); |
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flow->dst = ipv6_addr_hash(skb, |
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nhoff + offsetof(struct ipv6hdr, daddr)); |
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nhoff += sizeof(struct ipv6hdr); |
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return nhoff; |
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} |
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static inline bool flow_dissector(struct __sk_buff *skb, |
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struct flow_key_record *flow) |
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{ |
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__u64 nhoff = ETH_HLEN; |
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__u64 ip_proto; |
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__u64 proto = load_half(skb, 12); |
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int poff; |
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if (proto == ETH_P_8021AD) { |
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proto = load_half(skb, nhoff + offsetof(struct vlan_hdr, |
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h_vlan_encapsulated_proto)); |
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nhoff += sizeof(struct vlan_hdr); |
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} |
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if (proto == ETH_P_8021Q) { |
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proto = load_half(skb, nhoff + offsetof(struct vlan_hdr, |
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h_vlan_encapsulated_proto)); |
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nhoff += sizeof(struct vlan_hdr); |
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} |
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if (likely(proto == ETH_P_IP)) |
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nhoff = parse_ip(skb, nhoff, &ip_proto, flow); |
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else if (proto == ETH_P_IPV6) |
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nhoff = parse_ipv6(skb, nhoff, &ip_proto, flow); |
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else |
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return false; |
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switch (ip_proto) { |
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case IPPROTO_GRE: { |
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struct gre_hdr { |
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__be16 flags; |
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__be16 proto; |
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}; |
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__u64 gre_flags = load_half(skb, |
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nhoff + offsetof(struct gre_hdr, flags)); |
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__u64 gre_proto = load_half(skb, |
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nhoff + offsetof(struct gre_hdr, proto)); |
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if (gre_flags & (GRE_VERSION|GRE_ROUTING)) |
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break; |
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proto = gre_proto; |
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nhoff += 4; |
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if (gre_flags & GRE_CSUM) |
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nhoff += 4; |
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if (gre_flags & GRE_KEY) |
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nhoff += 4; |
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if (gre_flags & GRE_SEQ) |
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nhoff += 4; |
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if (proto == ETH_P_8021Q) { |
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proto = load_half(skb, |
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nhoff + offsetof(struct vlan_hdr, |
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h_vlan_encapsulated_proto)); |
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nhoff += sizeof(struct vlan_hdr); |
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} |
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if (proto == ETH_P_IP) |
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nhoff = parse_ip(skb, nhoff, &ip_proto, flow); |
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else if (proto == ETH_P_IPV6) |
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nhoff = parse_ipv6(skb, nhoff, &ip_proto, flow); |
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else |
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return false; |
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break; |
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} |
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case IPPROTO_IPIP: |
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nhoff = parse_ip(skb, nhoff, &ip_proto, flow); |
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break; |
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case IPPROTO_IPV6: |
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nhoff = parse_ipv6(skb, nhoff, &ip_proto, flow); |
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break; |
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default: |
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break; |
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} |
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flow->ip_proto = ip_proto; |
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poff = proto_ports_offset(ip_proto); |
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if (poff >= 0) { |
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nhoff += poff; |
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flow->ports = load_word(skb, nhoff); |
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} |
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flow->thoff = (__u16) nhoff; |
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return true; |
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} |
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struct pair { |
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long packets; |
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long bytes; |
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}; |
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struct { |
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__uint(type, BPF_MAP_TYPE_HASH); |
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__type(key, __be32); |
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__type(value, struct pair); |
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__uint(max_entries, 1024); |
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} hash_map SEC(".maps"); |
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SEC("socket2") |
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int bpf_prog2(struct __sk_buff *skb) |
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{ |
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struct flow_key_record flow = {}; |
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struct pair *value; |
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u32 key; |
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if (!flow_dissector(skb, &flow)) |
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return 0; |
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key = flow.dst; |
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value = bpf_map_lookup_elem(&hash_map, &key); |
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if (value) { |
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__sync_fetch_and_add(&value->packets, 1); |
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__sync_fetch_and_add(&value->bytes, skb->len); |
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} else { |
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struct pair val = {1, skb->len}; |
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bpf_map_update_elem(&hash_map, &key, &val, BPF_ANY); |
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} |
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return 0; |
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} |
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char _license[] SEC("license") = "GPL";
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