Modifying IPv4 headers


 
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Special Forums IP Networking Modifying IPv4 headers
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Old 12-25-2009
Question Modifying IPv4 headers

Hi,

My query is:
I need to set the IPv4 header fields(like TOS, TTL, Precedence and Flags) in the linux kernel using the system calls.
I tried setting the fields using the setsockopt() call using sockets but it is not reflecting the actual IPv4 header fields. Is it possible to modify these fields? Please let me know the way of setting IPv4 header fields using the system calls.

Also, I can set the TTL field using /proc interface - /proc/sys/net/ipv4/ip_default_ttl. Anyone knows how to set for other header fields?

I tried googling but I couldn't find it. Please help me.

Thanks in advance,
Kiran.
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sctp_getladdrs(3SOCKET) 				     Sockets Library Functions					   sctp_getladdrs(3SOCKET)

NAME
sctp_getladdrs, sctp_freeladdrs - returns all locally bound addresses on an SCTP socket SYNOPSIS
cc [ flag... ] file... -lsocket -lnsl -lsctp [ library... ] #include <sys/types.h> #include <sys/socket.h> #include <netinet/sctp.h> int sctp_getladdrs(int sock, sctp_assoc_t id, void **addrs, void sctp_freeladdrs(void *addrs); DESCRIPTION
The sctp_getladdrs() function queries addresses to which an SCTP socket is bound. The sctp_freeladdrs() function releases resources that are allocated to hold the addresses. The sctp_getladdrs() function returns all the locally bound addresses on the SCTP socket sock. On completion addrs points to a dynamically allocated array of sockaddr_in structures for an Internet Protocol (IPv4) socket or an array of sockaddr_in6 structures for an Internet Protocol Version 6 (IPv6) socket. The addrs parameter must not be NULL. For an IPv4 SCTP socket, the addresses returned in the sockaddr_in structures are IPv4 addresses. For an IPv6 SCTP socket, the addresses in the sockaddr_in6 structures can be IPv6 addresses or IPv4-mapped IPv6 addresses. If sock is a one-to-many style SCTP socket, id specifies the association of interest. A value of 0 to id returns locally-bound addresses regardless of a particular association. If sock is a one-to-one style SCTP socket, id is ignored. The sctp_freeladdrs() function frees the resources allocated by sctp_getladdrs(). The addrs parameter is the array of addresses allocated by sctp_getladdrs(). RETURN VALUES
Upon successful completion, the sctp_getladdrs() function returns the number of addresses in the addrs array. Otherwise, the function returns -1 and sets errno to indicate the error. ERRORS
The sctp_getladdrs() call fails under the following conditions. EBADF The sock argument is an invalid file descriptor. ENOTSOCK The sock argument is not a socket. EINVAL The addrs argument is NULL. EINVAL The id argument is an invalid socket. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Evolving | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
bind(3SOCKET), in.h(3HEAD), libsctp(3LIB), sctp_freepaddrs(3SOCKET), sctp_getpaddrs(3SOCKET), socket(3SOCKET), inet(7P), inet6(7P), ip(7P), ip6(7P), sctp(7P) SunOS 5.10 05 Mar 2004 sctp_getladdrs(3SOCKET)