bpf(9) - NetBSD Manual Pages

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BPF(9)                 NetBSD Kernel Developer's Manual                 BPF(9)


NAME
bpf -- Berkeley Packet Filter kernel interface
SYNOPSIS
#include <sys/mbuf.h> #include <net/bpf.h>
DESCRIPTION
bpf is called via an operations vector described by the following struct: struct bpf_ops { void (*bpf_attach)(struct ifnet *, u_int, u_int, struct bpf_if **); void (*bpf_detach)(struct ifnet *); void (*bpf_change_type)(struct ifnet *, u_int, u_int); void (*bpf_mtap)(struct bpf_if *, struct mbuf *); void (*bpf_mtap2)(struct bpf_if *, void *, u_int, struct mbuf *); void (*bpf_mtap_af)(struct bpf_if *, uint32_t, struct mbuf *); void (*bpf_mtap_et)(struct bpf_if *, uint16_t, struct mbuf *); void (*bpf_mtap_sl_in)(struct bpf_if *, u_char *, struct mbuf **); void (*bpf_mtap_sl_out)(struct bpf_if *, u_char *, struct mbuf *); }; This vector is found from struct bpf_ops * bpf_ops. It is either a ``stub'' implementation or a real implementation, depending on whether bpf is absent or present in the kernel, respectively.
CODE REFERENCES
The bpf implementation is located in sys/net/bpf.c, the stub implementa- tion is in sys/net/bpf_stub.c, and sys/net/bpf.h describes the interface. NetBSD 9.99 June 25, 2018 NetBSD 9.99
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