проверить, соответствует ли фильтр пакету  (check whether a filter matches a packet)
  
Имя (Name)
pcap_offline_filter - check whether a filter matches a packet
Синопсис (Synopsis)
#include <pcap/pcap.h>
       int pcap_offline_filter(const struct bpf_program *fp,
               const struct pcap_pkthdr *h, const u_char *pkt)
Описание (Description)
pcap_offline_filter() checks whether a filter matches a packet.
       fp is a pointer to a bpf_program struct, usually the result of a
       call to pcap_compile(3PCAP).  h points to the pcap_pkthdr
       structure for the packet, and pkt points to the data in the
       packet.
Возвращаемое значение (Return value)
pcap_offline_filter() returns the return value of the filter
       program.  This will be zero if the packet doesn't match the
       filter and non-zero if the packet matches the filter.
Смотри также (See also)
pcap(3PCAP)