SK_UNATTACHED_FILTER(9) Linux Networking SK_UNATTACHED_FILTER(9)NAME
sk_unattached_filter_create - create an unattached filter
int sk_unattached_filter_create(struct sk_filter ** pfp, struct sock_fprog * fprog);
the unattached filter that is created
the filter program
Create a filter independent of any socket. We first run some sanity checks on it to make sure it does not explode on us later. If an error
occurs or there is insufficient memory for the filter a negative errno code is returned. On success the return is zero.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SK_UNATTACHED_FILTER(9)
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pcap_compile - compile a filter expression
int pcap_compile(pcap_t *p, struct bpf_program *fp,
const char *str, int optimize, bpf_u_int32 netmask);
pcap_compile() is used to compile the string str into a filter program. See pcap-filter(7) for the syntax of that string. program is a
pointer to a bpf_program struct and is filled in by pcap_compile(). optimize controls whether optimization on the resulting code is per-
formed. netmask specifies the IPv4 netmask of the network on which packets are being captured; it is used only when checking for IPv4
broadcast addresses in the filter program. If the netmask of the network on which packets are being captured isn't known to the program,
or if packets are being captured on the Linux "any" pseudo-interface that can capture on more than one network, a value of PCAP_NET-
MASK_UNKNOWN can be supplied; tests for IPv4 broadcast addresses will fail to compile, but all other tests in the filter program will be
pcap_compile() returns 0 on success and -1 on failure. If -1 is returned, pcap_geterr() or pcap_perror() may be called with p as an argu-
ment to fetch or display the error text.
SEE ALSO pcap(3PCAP), pcap_setfilter(3PCAP), pcap_freecode(3PCAP), pcap_geterr(3PCAP), pcap-filter(7)
7 April 2014 PCAP_COMPILE(3PCAP)
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