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Fix bug #47641: lwIP would accept IPv6 source addresses from the network that are mapped IPv4 adresses

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This commit is contained in:
Dirk Ziegelmeier 2016-04-27 21:35:34 +02:00
parent 30e6f908ee
commit 2e05856f90
2 changed files with 10 additions and 0 deletions
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8
src/core/ipv6/ip6.c
View File

@ -444,6 +444,14 @@ ip6_input(struct pbuf *p, struct netif *inp)
ip_addr_copy_from_ip6(ip_data.current_iphdr_dest, ip6hdr->dest);
ip_addr_copy_from_ip6(ip_data.current_iphdr_src, ip6hdr->src);
/* Don't accept virtual IPv6 mapped IPv4 addresses */
if(ip6_addr_isipv6mappedipv4(ip_2_ip6(&ip_data.current_iphdr_dest)) ||
ip6_addr_isipv6mappedipv4(ip_2_ip6(&ip_data.current_iphdr_src)) ) {
IP6_STATS_INC(ip6.err);
IP6_STATS_INC(ip6.drop);
return ERR_OK;
}
/* current header pointer. */
ip_data.current_ip6_header = ip6hdr;

2
src/include/lwip/ip6_addr.h
View File

@ -179,6 +179,8 @@ Little-endian version, stored in network order (no htonl). */
#define ip6_addr_isuniquelocal(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xfe000000UL)) == PP_HTONL(0xfc000000UL))
#define ip6_addr_isipv6mappedipv4(ip6addr) (((ip6addr)->addr[0] == 0) && ((ip6addr)->addr[1] == 0) && (((ip6addr)->addr[2]) == PP_HTONL(0x0000FFFFUL)))
#define ip6_addr_ismulticast(ip6addr) (((ip6addr)->addr[0] & PP_HTONL(0xff000000UL)) == PP_HTONL(0xff000000UL))
#define ip6_addr_multicast_transient_flag(ip6addr) ((ip6addr)->addr[0] & PP_HTONL(0x00100000UL))
#define ip6_addr_multicast_prefix_flag(ip6addr) ((ip6addr)->addr[0] & PP_HTONL(0x00200000UL))