ICMPv6 Type Filtering

• Filtering ICMPv6 messages by the type field

• struct icmp6_filter;

• /* initialization */

• void ICMP6_FILTER_SETPASSALL (struct icmp6_filter *);

• void ICMP6_FILTER_SETBLOCKALL(struct icmp6_filter *);

• /* pass/filter one-by-one */

• void ICMP6_FILTER_SETPASS ( int, struct icmp6_filter *);

• void ICMP6_FILTER_SETBLOCK( int, struct icmp6_filter *);

• /* test if specified message */

• int ICMP6_FILTER_WILLPASS (int, const struct icmp6_filter *);

• int ICMP6_FILTER_WILLBLOCK(int, const struct icmp6_filter *);

• Example

• struct icmp6_filter myfilt;

• fd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);　　

• ICMP6_FILTER_SETBLOCKALL(&myfilt);

• ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &myfilt);

• setsockopt(fd, IPPROTO_ICMPV6, ICMP6_FILTER, &myfilt, sizeof(myfilt));

Notes: