25 lines
988 B
Diff
25 lines
988 B
Diff
pppd: Cap MTU to the user configured value
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This patchs caps the calculated MTU value in lcp.c to the user specified "mru"
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option value. Without this patch pppd would advertise a different MTU value
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compared to what is set on the local interface in some cases.
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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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--- a/pppd/lcp.c
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+++ b/pppd/lcp.c
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@@ -1917,12 +1917,12 @@ lcp_up(f)
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* the interface MTU is set to the lowest of that, the
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* MTU we want to use, and our link MRU.
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*/
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- mtu = ho->neg_mru? ho->mru: PPP_MRU;
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+ mtu = MIN(ho->neg_mru? ho->mru: PPP_MRU, ao->mru);
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mru = go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU;
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#ifdef HAVE_MULTILINK
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if (!(multilink && go->neg_mrru && ho->neg_mrru))
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#endif /* HAVE_MULTILINK */
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- netif_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
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+ netif_set_mtu(f->unit, MIN(mtu, mru));
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ppp_send_config(f->unit, mtu,
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(ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
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ho->neg_pcompression, ho->neg_accompression);
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