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fix bug in RA MTU validation

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Also fix that RA could change IPv4 MTU.
See bug #53696

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>
This commit is contained in:
Simon Goldschmidt
2018-06-14 12:55:18 +02:00
parent 39faa8f61d
commit 944f286d87
4 changed files with 28 additions and 6 deletions
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9
src/include/lwip/netif.h
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@@ -333,6 +333,10 @@ struct netif {
#endif /* LWIP_CHECKSUM_CTRL_PER_NETIF*/
/** maximum transfer unit (in bytes) */
u16_t mtu;
#if LWIP_IPV6 && LWIP_ND6_ALLOW_RA_UPDATES
/** maximum transfer unit (in bytes), updated by RA */
u16_t mtu6;
#endif /* LWIP_IPV6 && LWIP_ND6_ALLOW_RA_UPDATES */
/** link level hardware address of this interface */
u8_t hwaddr[NETIF_MAX_HWADDR_LEN];
/** number of bytes used in hwaddr */
@@ -529,6 +533,11 @@ err_t netif_add_ip6_address(struct netif *netif, const ip6_addr_t *ip6addr, s8_t
#else /* !LWIP_IPV6_ADDRESS_LIFETIMES */
#define netif_ip6_addr_isstatic(netif, i) (1) /* all addresses are static */
#endif /* !LWIP_IPV6_ADDRESS_LIFETIMES */
#if LWIP_ND6_ALLOW_RA_UPDATES
#define netif_mtu6(netif) ((netif)->mtu6)
#else /* LWIP_ND6_ALLOW_RA_UPDATES */
#define netif_mtu6(netif) ((netif)->mtu)
#endif /* LWIP_ND6_ALLOW_RA_UPDATES */
#endif /* LWIP_IPV6 */
#if LWIP_NETIF_USE_HINTS