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Fix bug #56136: The netif->mtu6 was updated by Router Advertisement abnomally
Using patch from Gao Quingahui plus improvement
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@ -697,7 +697,7 @@ nd6_input(struct pbuf *p, struct netif *inp)
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#if LWIP_ND6_ALLOW_RA_UPDATES
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if (inp->mtu) {
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/* don't set the mtu for IPv6 higher than the netif driver supports */
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inp->mtu6 = LWIP_MIN(inp->mtu, (u16_t)mtu32);
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inp->mtu6 = LWIP_MIN(LWIP_MIN(inp->mtu, inp->mtu6), (u16_t)mtu32);
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} else {
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inp->mtu6 = (u16_t)mtu32;
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}
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@ -1031,6 +1031,10 @@ netif_set_link_down(struct netif *netif)
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if (netif->flags & NETIF_FLAG_LINK_UP) {
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netif_clear_flags(netif, NETIF_FLAG_LINK_UP);
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#if LWIP_IPV6 && LWIP_ND6_ALLOW_RA_UPDATES
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netif->mtu6 = netif->mtu;
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#endif
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NETIF_LINK_CALLBACK(netif);
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#if LWIP_NETIF_EXT_STATUS_CALLBACK
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{
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