IP_HDRINCL2const
Include a user-supplied ip header
Usage
#include <netinet/in.h> /* Definition of IP* constants */ #include <sys/socket.h>
int setsockopt(int sockfd, IPPROTO_IP, IP_HDRINCL, const int *enable, sizeof(int));
Library
Standard C library (libc, -lc)
Overview
If enabled, the user supplies an IP header in front of the user data.
Valid only for SOCK_RAW sockets; see raw(7) for more information.
When this flag is enabled, the values set by IP_OPTIONS(2const), IP_TTL(2const), and IP_TOS(2const) are ignored.
Errors
See IPPROTO_IP(2const). See setsockopt(2). See ip(7).