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PPP: allow negotiating MRU with PPP_MRU config option
PPP_MRU is now free to be used for what it should have been. Now using it at PPP init stage to set the wanted MRU value, triggering a MRU negotiation at the LCP phase. I doubt anyone needs it anyway, but, well, at least it is fixed and the MRU/MTU config mess is cleaned. And while we are at it, better document PPP MRU config values.
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@ -495,21 +495,33 @@
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*/
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*/
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/**
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/**
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* PPP_MRU: Default MRU
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* PPP_MRU: MRU value we want to negotiate (peer MTU)
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*
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* It only affects PPPoS because PPPoE value is derived from the
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* Ethernet interface MTU and PPPoL2TP have a separate setting.
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*/
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*/
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#ifndef PPP_MRU
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#ifndef PPP_MRU
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#define PPP_MRU 1500
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#define PPP_MRU 1500
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#endif
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#endif
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/**
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/**
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* PPP_MAXMRU: Normally limit MRU to this (pppd default = 16384)
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* PPP_MAXMRU: Normally limit peer MRU to this
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*
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* This is the upper limit value to which we set our interface MTU.
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* If the peer sends a larger number, we will just ignore it as we
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* are not required to maximize the use of the peer capacity.
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*
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* It only affects PPPoS because PPPoE value is derived from the
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* Ethernet interface MTU and PPPoL2TP have a separate setting.
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*/
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*/
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#ifndef PPP_MAXMRU
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#ifndef PPP_MAXMRU
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#define PPP_MAXMRU 1500
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#define PPP_MAXMRU 1500
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#endif
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#endif
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/**
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/**
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* PPP_MINMRU: No MRUs below this
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* PPP_MINMRU: No peer MRUs below this
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*
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* Peer must be able to receive at least our minimum MTU.
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*/
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*/
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#ifndef PPP_MINMRU
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#ifndef PPP_MINMRU
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#define PPP_MINMRU 128
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#define PPP_MINMRU 128
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@ -373,7 +373,7 @@ static void lcp_init(ppp_pcb *pcb) {
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BZERO(wo, sizeof(*wo));
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BZERO(wo, sizeof(*wo));
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wo->neg_mru = 1;
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wo->neg_mru = 1;
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wo->mru = PPP_DEFMRU;
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wo->mru = PPP_MRU;
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wo->neg_asyncmap = 1;
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wo->neg_asyncmap = 1;
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wo->neg_magicnumber = 1;
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wo->neg_magicnumber = 1;
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wo->neg_pcompression = 1;
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wo->neg_pcompression = 1;
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