ROHC compression context for the IP-only profile. More...

#include "c_generic.h"

Include dependency graph for c_ip.h:

This graph shows which files directly or indirectly include this file:

Functions
int	c_ip_check_context (const struct c_context context, const struct ip_packet ip)
	Check if an IP packet belongs to the context.
rohc_packet_t	c_ip_decide_FO_packet (const struct c_context *context)
	Decide which packet to send when in First Order (FO) state.
rohc_packet_t	c_ip_decide_SO_packet (const struct c_context *context)
	Decide which packet to send when in Second Order (SO) state.
uint32_t	c_ip_get_next_sn (const struct c_context context, const struct ip_packet outer_ip, const struct ip_packet *inner_ip)
	Determine the SN value for the next packet.
int	c_ip_code_ir_remainder (const struct c_context context, unsigned char const dest, int counter)
	Code the remainder header for the IR or IR-DYN packets.

Detailed Description

ROHC compression context for the IP-only profile.

Author:: Didier Barvaux <didier.barvaux@toulouse.viveris.com>; The hackers from ROHC for Linux

Function Documentation

int c_ip_check_context	(	const struct c_context *	context,
		const struct ip_packet *	ip
	)

Check if an IP packet belongs to the context.

Conditions are:

the number of IP headers must be the same as in context
IP version of the two IP headers must be the same as in context
IP packets must not be fragmented
the source and destination addresses of the two IP headers must match the ones in the context
IPv6 only: the Flow Label of the two IP headers must match the ones the context

This function is one of the functions that must exist in one profile for the framework to work.

Parameters:

context	The compression context
ip	The IP packet to check

Returns:: 1 if the IP packet belongs to the context, 0 if it does not belong to the context and -1 if the profile cannot compress it or an error occurs

References ipv4_hdr::daddr, ip_header_info::info, c_generic_context::ip2_flags, ipv6_hdr::ip6_dst, ipv6_hdr::ip6_src, c_generic_context::ip_flags, ip_get_inner_packet(), ip_get_protocol(), ip_get_version(), IPV4, ipv4_get_daddr(), ipv4_get_saddr(), IPV6, IPV6_ADDR_CMP, ipv6_get_daddr(), IPV6_GET_FLOW_LABEL, ipv6_get_flow_label(), ipv6_get_saddr(), c_generic_context::is_ip2_initialized, c_generic_context::next_header_proto, ipv4_header_info::old_ip, ipv6_header_info::old_ip, rohc_debugf, ROHC_IPPROTO_IPIP, ROHC_IPPROTO_IPV6, ipv4_hdr::saddr, c_context::specific, ip_header_info::v4, ip_header_info::v6, version, and ip_header_info::version.

int c_ip_code_ir_remainder	(	const struct c_context *	context,
		unsigned char *const	dest,
		int	counter
	)

Code the remainder header for the IR or IR-DYN packets.


 Remainder of IR/IR-DYN packet (5.7.7.1):

      0   1   2   3   4   5   6   7
    +---+---+---+---+---+---+---+---+
 1  |             SN                |  2 octets if not RTP
    +---+---+---+---+---+---+---+---+

Parameters: