diff options
-rw-r--r-- | lib/in46_addr.c | 17 | ||||
-rw-r--r-- | lib/in46_addr.h | 1 |
2 files changed, 18 insertions, 0 deletions
diff --git a/lib/in46_addr.c b/lib/in46_addr.c index 844e318..a220583 100644 --- a/lib/in46_addr.c +++ b/lib/in46_addr.c @@ -74,6 +74,23 @@ int in46a_equal(const struct in46_addr *a, const struct in46_addr *b) return 0; } +/*! Determine if two in46_addr prefix are equal or not + * The prefix length is determined by the shortest of the prefixes of a and b + * \returns 1 in case the common prefix are equal; 0 otherwise */ +int in46a_prefix_equal(const struct in46_addr *a, const struct in46_addr *b) +{ + unsigned int len; + if (a->len > b->len) + len = b->len; + else + len = a->len; + + if (!memcmp(&a->v6, &b->v6, len)) + return 1; + else + return 0; +} + /*! Match if IPv6 addr1 + addr2 are within same \a mask */ static int ipv6_within_mask(const struct in6_addr *addr1, const struct in6_addr *addr2, const struct in6_addr *mask) diff --git a/lib/in46_addr.h b/lib/in46_addr.h index a0ad6e1..0afd2b4 100644 --- a/lib/in46_addr.h +++ b/lib/in46_addr.h @@ -18,6 +18,7 @@ extern int in46a_to_af(const struct in46_addr *in); extern int in46a_to_sas(struct sockaddr_storage *out, const struct in46_addr *in); extern const char *in46a_ntop(const struct in46_addr *in, char *dst, socklen_t dst_size); extern int in46a_equal(const struct in46_addr *a, const struct in46_addr *b); +extern int in46a_prefix_equal(const struct in46_addr *a, const struct in46_addr *b); extern int in46a_within_mask(const struct in46_addr *addr, const struct in46_addr *net, size_t prefixlen); int in46a_to_eua(const struct in46_addr *src, struct ul66_t *eua); |