PCAP-LINKTYPE(7) Miscellaneous Information Manual PCAP-LINKTYPE(7)NAME
pcap-linktype - link-layer header types supported by libpcap
For a live capture or ``savefile'', libpcap supplies, as the return value of the pcap_datalink(3PCAP) routine, a value that indicates the
type of link-layer header at the beginning of the packets it provides. This is not necessarily the type of link-layer header that the
packets being captured have on the network from which they're being captured; for example, packets from an IEEE 802.11 network might be
provided by libpcap with Ethernet headers that the network adapter or the network adapter driver generates from the 802.11 headers. The
names for those values begin with DLT_, so they are sometimes called "DLT_ values".
The values stored in the link-layer header type field in the savefile header are, in most but not all cases, the same as the values
returned by pcap_datalink(). The names for those values begin with LINKTYPE_.
The link-layer header types supported by libpcap are described at http://www.tcpdump.org/linktypes.html.
SEE ALSO pcap_datalink(3PCAP)
23 October 2008 PCAP-LINKTYPE(7)
Check Out this Related Man Page
PCAP_DATALINK(3) Library Functions Manual PCAP_DATALINK(3)NAME
pcap_datalink - get the link-layer header type
int pcap_datalink(pcap_t *p);
pcap_datalink() returns the link-layer header type for the live capture or ``savefile'' specified by p.
It must not be called on a pcap descriptor created by pcap_create() that has not yet been activated by pcap_activate().
http://www.tcpdump.org/linktypes.html lists the values pcap_datalink() can return and describes the packet formats that correspond to those
Do NOT assume that the packets for a given capture or ``savefile`` will have any given link-layer header type, such as DLT_EN10MB for Eth-
ernet. For example, the "any" device on Linux will have a link-layer header type of DLT_LINUX_SLL even if all devices on the system at the
time the "any" device is opened have some other data link type, such as DLT_EN10MB for Ethernet.
pcap_datalink() returns the link-layer header type on success and PCAP_ERROR_NOT_ACTIVATED if called on a capture handle that has been cre-
ated but not activated.
SEE ALSO pcap(3), pcap-linktype(7)
13 October 2013 PCAP_DATALINK(3)
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