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sockets.h: minor changes, add comments for ToS options

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fbernon 2008-04-26 10:46:23 +00:00
parent 9ccd31a12e
commit 7be9e292dc
1 changed files with 23 additions and 2 deletions
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25
src/include/lwip/sockets.h
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@ -177,7 +177,22 @@ typedef struct ip_mreq {
} ip_mreq;
#endif /* LWIP_IGMP */
/* Unimplemented for now... */
/*
* The Type of Service provides an indication of the abstract
* parameters of the quality of service desired. These parameters are
* to be used to guide the selection of the actual service parameters
* when transmitting a datagram through a particular network. Several
* networks offer service precedence, which somehow treats high
* precedence traffic as more important than other traffic (generally
* by accepting only traffic above a certain precedence at time of high
* load). The major choice is a three way tradeoff between low-delay,
* high-reliability, and high-throughput.
* The use of the Delay, Throughput, and Reliability indications may
* increase the cost (in some sense) of the service. In many networks
* better performance for one of these parameters is coupled with worse
* performance on another. Except for very unusual cases at most two
* of these three indications should be set.
*/
#define IPTOS_TOS_MASK 0x1E
#define IPTOS_TOS(tos) ((tos) & IPTOS_TOS_MASK)
#define IPTOS_LOWDELAY 0x10
@ -187,7 +202,13 @@ typedef struct ip_mreq {
#define IPTOS_MINCOST IPTOS_LOWCOST
/*
* Definitions for IP precedence (also in ip_tos) (Unimplemented)
* The Network Control precedence designation is intended to be used
* within a network only. The actual use and control of that
* designation is up to each network. The Internetwork Control
* designation is intended for use by gateway control originators only.
* If the actual use of these precedence designations is of concern to
* a particular network, it is the responsibility of that network to
* control the access to, and use of, those precedence designations.
*/
#define IPTOS_PREC_MASK 0xe0
#define IPTOS_PREC(tos) ((tos) & IPTOS_PREC_MASK)