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domenico
2025-06-24 14:35:53 +02:00
commit c06fb25d1f
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25
package/network/services/ppp/patches/207-lcp_mtu_max.patch Normal file
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@@ -0,0 +1,25 @@
pppd: Cap MTU to the user configured value
This patchs caps the calculated MTU value in lcp.c to the user specified "mru"
option value. Without this patch pppd would advertise a different MTU value
compared to what is set on the local interface in some cases.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
--- a/pppd/lcp.c
+++ b/pppd/lcp.c
@@ -1888,12 +1888,12 @@ lcp_up(fsm *f)
* the interface MTU is set to the lowest of that, the
* MTU we want to use, and our link MRU.
*/
- mtu = ho->neg_mru? ho->mru: PPP_MRU;
+ mtu = MIN(ho->neg_mru? ho->mru: PPP_MRU, ao->mru);
mru = go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU;
#ifdef PPP_WITH_MULTILINK
if (!(multilink && go->neg_mrru && ho->neg_mrru))
#endif /* PPP_WITH_MULTILINK */
- ppp_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
+ ppp_set_mtu(f->unit, MIN(mtu, mru));
ppp_send_config(f->unit, mtu,
(ho->neg_asyncmap? ho->asyncmap: 0xffffffff),
ho->neg_pcompression, ho->neg_accompression);