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lib: prefix2sockunion, prefix_common_bits helper functions
prefix2sockunion converts a struct prefix* to a union sockunion *; prefix_common_bits counts the number of common bits in the prefix's address part.
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54
lib/prefix.c
54
lib/prefix.c
@ -181,6 +181,46 @@ prefix_cmp (const struct prefix *p1, const struct prefix *p2)
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return 0;
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}
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/*
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* Count the number of common bits in 2 prefixes. The prefix length is
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* ignored for this function; the whole prefix is compared. If the prefix
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* address families don't match, return -1; otherwise the return value is
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* in range 0 ... maximum prefix length for the address family.
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*/
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int
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prefix_common_bits (const struct prefix *p1, const struct prefix *p2)
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{
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int pos, bit;
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int length = 0;
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u_char xor;
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/* Set both prefix's head pointer. */
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const u_char *pp1 = (const u_char *)&p1->u.prefix;
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const u_char *pp2 = (const u_char *)&p2->u.prefix;
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if (p1->family == AF_INET)
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length = IPV4_MAX_BYTELEN;
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#ifdef HAVE_IPV6
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if (p1->family == AF_INET6)
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length = IPV6_MAX_BYTELEN;
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#endif
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if (p1->family != p2->family || !length)
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return -1;
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for (pos = 0; pos < length; pos++)
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if (pp1[pos] != pp2[pos])
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break;
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if (pos == length)
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return pos * 8;
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xor = pp1[pos] ^ pp2[pos];
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for (bit = 0; bit < 8; bit++)
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if (xor & (1 << (7 - bit)))
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break;
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return pos * 8 + bit;
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}
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/* Return prefix family type string. */
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const char *
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prefix_family_str (const struct prefix *p)
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@ -570,6 +610,20 @@ sockunion2hostprefix (const union sockunion *su)
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return NULL;
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}
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void
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prefix2sockunion (const struct prefix *p, union sockunion *su)
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{
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memset (su, 0, sizeof (*su));
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su->sa.sa_family = p->family;
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if (p->family == AF_INET)
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su->sin.sin_addr = p->u.prefix4;
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#ifdef HAVE_IPV6
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if (p->family == AF_INET6)
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memcpy (&su->sin6.sin6_addr, &p->u.prefix6, sizeof (struct in6_addr));
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#endif /* HAVE_IPV6 */
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}
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int
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prefix_blen (const struct prefix *p)
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{
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@ -157,12 +157,14 @@ extern int prefix2str (const struct prefix *, char *, int);
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extern int prefix_match (const struct prefix *, const struct prefix *);
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extern int prefix_same (const struct prefix *, const struct prefix *);
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extern int prefix_cmp (const struct prefix *, const struct prefix *);
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extern int prefix_common_bits (const struct prefix *, const struct prefix *);
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extern void prefix_copy (struct prefix *dest, const struct prefix *src);
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extern void apply_mask (struct prefix *);
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extern struct prefix *sockunion2prefix (const union sockunion *dest,
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const union sockunion *mask);
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extern struct prefix *sockunion2hostprefix (const union sockunion *);
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extern void prefix2sockunion (const struct prefix *, union sockunion *);
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extern struct prefix_ipv4 *prefix_ipv4_new (void);
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extern void prefix_ipv4_free (struct prefix_ipv4 *);
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