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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 <jow@openwrt.org>
--- a/pppd/lcp.c
+++ b/pppd/lcp.c
@@ -1917,12 +1917,12 @@ lcp_up(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 HAVE_MULTILINK
if (!(multilink && go->neg_mrru && ho->neg_mrru))
#endif /* HAVE_MULTILINK */
- netif_set_mtu(f->unit, MIN(MIN(mtu, mru), ao->mru));
+ netif_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);
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