diff options
Diffstat (limited to 'pcap-linux.c')
| -rw-r--r-- | pcap-linux.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/pcap-linux.c b/pcap-linux.c index 4df339c2..a2ace7b7 100644 --- a/pcap-linux.c +++ b/pcap-linux.c @@ -2943,7 +2943,24 @@ static void map_arphrd_to_dlt(pcap_t *handle, int sock_fd, int arptype, #define ARPHRD_CAN 280 #endif case ARPHRD_CAN: - handle->linktype = DLT_CAN_SOCKETCAN; + /* + * DLT_CAN_SOCKETCAN_BIGENDIAN is defined to have the + * can_id field of the pseudo-header in big-endian + * (network) byte order. + * + * The packets delivered to sockets have that field + * in host byte order. + * + * The code that implements it in packet-can-linux.c + * passes that field to htonl() to put it into network + * byte order. + * + * The code that reads from a PF_PACKET socket doesn't + * change the byte order of that field, so we define + * a new DLT_CAN_SOCKETCAN_HOSTENDIAN, where the can_id + * is in host byte order. + */ + handle->linktype = DLT_CAN_SOCKETCAN_HOSTENDIAN; break; #ifndef ARPHRD_IEEE802_TR |