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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
commit | 2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 (patch) | |
tree | c05dc0f8e6aa3accc84e3e5cffc933ed94941383 /ldpd/util.c | |
parent | Initial commit. (diff) | |
download | frr-upstream.tar.xz frr-upstream.zip |
Adding upstream version 8.4.4.upstream/8.4.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | ldpd/util.c | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/ldpd/util.c b/ldpd/util.c new file mode 100644 index 0000000..019d846 --- /dev/null +++ b/ldpd/util.c @@ -0,0 +1,382 @@ +/* $OpenBSD$ */ + +/* + * Copyright (c) 2015 Renato Westphal <renato@openbsd.org> + * Copyright (c) 2012 Alexander Bluhm <bluhm@openbsd.org> + * Copyright (c) 2004 Esben Norby <norby@openbsd.org> + * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> + * + * Permission to use, copy, modify, and distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include <zebra.h> + +#include "ldpd.h" +#include "log.h" + +uint8_t +mask2prefixlen(in_addr_t ina) +{ + if (ina == 0) + return (0); + else + return (33 - ffs(ntohl(ina))); +} + +uint8_t +mask2prefixlen6(struct sockaddr_in6 *sa_in6) +{ + uint8_t l = 0, *ap, *ep; + + /* + * sin6_len is the size of the sockaddr so substract the offset of + * the possibly truncated sin6_addr struct. + */ + ap = (uint8_t *)&sa_in6->sin6_addr; + ep = (uint8_t *)sa_in6 + sockaddr_len((struct sockaddr *)sa_in6); + for (; ap < ep; ap++) { + /* this "beauty" is adopted from sbin/route/show.c ... */ + switch (*ap) { + case 0xff: + l += 8; + break; + case 0xfe: + l += 7; + return (l); + case 0xfc: + l += 6; + return (l); + case 0xf8: + l += 5; + return (l); + case 0xf0: + l += 4; + return (l); + case 0xe0: + l += 3; + return (l); + case 0xc0: + l += 2; + return (l); + case 0x80: + l += 1; + return (l); + case 0x00: + return (l); + default: + fatalx("non contiguous inet6 netmask"); + } + } + + return (l); +} + +in_addr_t +prefixlen2mask(uint8_t prefixlen) +{ + if (prefixlen == 0) + return (0); + + return (htonl(0xffffffff << (32 - prefixlen))); +} + +struct in6_addr * +prefixlen2mask6(uint8_t prefixlen) +{ + static struct in6_addr mask; + int i; + + memset(&mask, 0, sizeof(mask)); + for (i = 0; i < prefixlen / 8; i++) + mask.s6_addr[i] = 0xff; + i = prefixlen % 8; + if (i) + mask.s6_addr[prefixlen / 8] = 0xff00 >> i; + + return (&mask); +} + +void +ldp_applymask(int af, union ldpd_addr *dest, const union ldpd_addr *src, + int prefixlen) +{ + struct in6_addr mask; + int i; + + switch (af) { + case AF_INET: + dest->v4.s_addr = src->v4.s_addr & prefixlen2mask(prefixlen); + break; + case AF_INET6: + memset(&mask, 0, sizeof(mask)); + for (i = 0; i < prefixlen / 8; i++) + mask.s6_addr[i] = 0xff; + i = prefixlen % 8; + if (i) + mask.s6_addr[prefixlen / 8] = 0xff00 >> i; + + for (i = 0; i < 16; i++) + dest->v6.s6_addr[i] = src->v6.s6_addr[i] & + mask.s6_addr[i]; + break; + default: + fatalx("ldp_applymask: unknown af"); + } +} + +int +ldp_addrcmp(int af, const union ldpd_addr *a, const union ldpd_addr *b) +{ + switch (af) { + case AF_INET: + if (a->v4.s_addr == b->v4.s_addr) + return (0); + return ((ntohl(a->v4.s_addr) > ntohl(b->v4.s_addr)) ? 1 : -1); + case AF_INET6: + return (memcmp(&a->v6, &b->v6, sizeof(struct in6_addr))); + default: + fatalx("ldp_addrcmp: unknown af"); + } +} + +int +ldp_addrisset(int af, const union ldpd_addr *addr) +{ + switch (af) { + case AF_UNSPEC: + return (0); + case AF_INET: + if (addr->v4.s_addr != INADDR_ANY) + return (1); + break; + case AF_INET6: + if (!IN6_IS_ADDR_UNSPECIFIED(&addr->v6)) + return (1); + break; + default: + fatalx("ldp_addrisset: unknown af"); + } + + return (0); +} + +int +ldp_prefixcmp(int af, const union ldpd_addr *a, const union ldpd_addr *b, + uint8_t prefixlen) +{ + in_addr_t mask, aa, ba; + int i; + uint8_t m; + + switch (af) { + case AF_INET: + if (prefixlen == 0) + return (0); + if (prefixlen > IPV4_MAX_BITLEN) + fatalx("ldp_prefixcmp: bad IPv4 prefixlen"); + mask = htonl(prefixlen2mask(prefixlen)); + aa = htonl(a->v4.s_addr) & mask; + ba = htonl(b->v4.s_addr) & mask; + return (aa - ba); + case AF_INET6: + if (prefixlen == 0) + return (0); + if (prefixlen > IPV6_MAX_BITLEN) + fatalx("ldp_prefixcmp: bad IPv6 prefixlen"); + for (i = 0; i < prefixlen / 8; i++) + if (a->v6.s6_addr[i] != b->v6.s6_addr[i]) + return (a->v6.s6_addr[i] - b->v6.s6_addr[i]); + i = prefixlen % 8; + if (i) { + m = 0xff00 >> i; + if ((a->v6.s6_addr[prefixlen / 8] & m) != + (b->v6.s6_addr[prefixlen / 8] & m)) + return ((a->v6.s6_addr[prefixlen / 8] & m) - + (b->v6.s6_addr[prefixlen / 8] & m)); + } + return (0); + default: + fatalx("ldp_prefixcmp: unknown af"); + } + return (-1); +} + +int +bad_addr_v4(struct in_addr addr) +{ + uint32_t a = ntohl(addr.s_addr); + + if (((a >> IN_CLASSA_NSHIFT) == 0) || + ((a >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) || + IN_MULTICAST(a) || IN_BADCLASS(a)) + return (1); + + return (0); +} + +int +bad_addr_v6(struct in6_addr *addr) +{ + if (IN6_IS_ADDR_UNSPECIFIED(addr) || + IN6_IS_ADDR_LOOPBACK(addr) || + IN6_IS_ADDR_MULTICAST(addr) || + IN6_IS_ADDR_SITELOCAL(addr) || + IN6_IS_ADDR_V4MAPPED(addr) || + IN6_IS_ADDR_V4COMPAT(addr)) + return (1); + + return (0); +} + +int +bad_addr(int af, union ldpd_addr *addr) +{ + switch (af) { + case AF_INET: + return (bad_addr_v4(addr->v4)); + case AF_INET6: + return (bad_addr_v6(&addr->v6)); + default: + fatalx("bad_addr: unknown af"); + } +} + +void +embedscope(struct sockaddr_in6 *sin6) +{ + uint16_t tmp16; + + if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) { + memcpy(&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof(tmp16)); + if (tmp16 != 0) { + log_warnx("%s: address %s already has embedded scope %u", + __func__, log_sockaddr(sin6), ntohs(tmp16)); + } + tmp16 = htons(sin6->sin6_scope_id); + memcpy(&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof(tmp16)); + sin6->sin6_scope_id = 0; + } +} + +void +recoverscope(struct sockaddr_in6 *sin6) +{ + uint16_t tmp16; + + if (sin6->sin6_scope_id != 0) + log_warnx("%s: address %s already has scope id %u", + __func__, log_sockaddr(sin6), sin6->sin6_scope_id); + + if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) { + memcpy(&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof(tmp16)); + sin6->sin6_scope_id = ntohs(tmp16); + sin6->sin6_addr.s6_addr[2] = 0; + sin6->sin6_addr.s6_addr[3] = 0; + } +} + +void +addscope(struct sockaddr_in6 *sin6, uint32_t id) +{ + if (sin6->sin6_scope_id != 0) + log_warnx("%s: address %s already has scope id %u", __func__, + log_sockaddr(sin6), sin6->sin6_scope_id); + + if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) + sin6->sin6_scope_id = id; +} + +void +clearscope(struct in6_addr *in6) +{ + if (IN6_IS_SCOPE_EMBED(in6)) { + in6->s6_addr[2] = 0; + in6->s6_addr[3] = 0; + } +} + +void +addr2sa(int af, const union ldpd_addr *addr, uint16_t port, union sockunion *su) +{ + struct sockaddr_in *sa_in = &su->sin; + struct sockaddr_in6 *sa_in6 = &su->sin6; + + memset(su, 0, sizeof(*su)); + switch (af) { + case AF_INET: + sa_in->sin_family = AF_INET; +#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN + sa_in->sin_len = sizeof(struct sockaddr_in); +#endif + sa_in->sin_addr = addr->v4; + sa_in->sin_port = htons(port); + break; + case AF_INET6: + sa_in6->sin6_family = AF_INET6; +#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN + sa_in6->sin6_len = sizeof(struct sockaddr_in6); +#endif + sa_in6->sin6_addr = addr->v6; + sa_in6->sin6_port = htons(port); + break; + default: + fatalx("addr2sa: unknown af"); + } +} + +void +sa2addr(struct sockaddr *sa, int *af, union ldpd_addr *addr, in_port_t *port) +{ + struct sockaddr_in *sa_in = (struct sockaddr_in *)sa; + struct sockaddr_in6 *sa_in6 = (struct sockaddr_in6 *)sa; + + if (addr) + memset(addr, 0, sizeof(*addr)); + switch (sa->sa_family) { + case AF_INET: + if (af) + *af = AF_INET; + if (addr) + addr->v4 = sa_in->sin_addr; + if (port) + *port = sa_in->sin_port; + break; + case AF_INET6: + if (af) + *af = AF_INET6; + if (addr) + addr->v6 = sa_in6->sin6_addr; + if (port) + *port = sa_in6->sin6_port; + break; + default: + fatalx("sa2addr: unknown af"); + } +} + +socklen_t +sockaddr_len(struct sockaddr *sa) +{ +#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN + return (sa->sa_len); +#else + switch (sa->sa_family) { + case AF_INET: + return (sizeof(struct sockaddr_in)); + case AF_INET6: + return (sizeof(struct sockaddr_in6)); + default: + fatalx("sockaddr_len: unknown af"); + } +#endif +} |