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Fix handling of scoped IPv6 addresses in IPSec code.

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* in ipsec_encap() embed scope zone ids into link-local addresses
  in the new IPv6 header, this helps ip6_output() disambiguate the
  scope;
* teach key_ismyaddr6() use in6_localip(). in6_localip() is less
  strict than key_sockaddrcmp(). It doesn't compare all fileds of
  struct sockaddr_in6, but it is faster and it should be safe,
  because all SA's data was checked for correctness. Also, since
  IPv6 link-local addresses in the &V_in6_ifaddrhead are stored in
  kernel-internal form, we need to embed scope zone id from SA into
  the address before calling in6_localip.
* in ipsec_common_input() take scope zone id embedded in the address
  and use it to initialize sin6_scope_id, then use this sockaddr
  structure to lookup SA, because we keep addresses in the SADB without
  embedded scope zone id.

Differential Revision:	https://reviews.freebsd.org/D2304
Reviewed by:	gnn
Sponsored by:	Yandex LLC
This commit is contained in:
Andrey V. Elsukov 2015-04-18 16:46:31 +00:00
parent 61f376155d
commit 1ae800e7a6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=281693
3 changed files with 21 additions and 36 deletions
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7
sys/netipsec/ipsec_input.c
View File

@ -195,6 +195,13 @@ ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto)
m_copydata(m, offsetof(struct ip6_hdr, ip6_dst),
sizeof(struct in6_addr),
(caddr_t) &dst_address.sin6.sin6_addr);
/* We keep addresses in SADB without embedded scope id */
if (IN6_IS_SCOPE_LINKLOCAL(&dst_address.sin6.sin6_addr)) {
/* XXX: sa6_recoverscope() */
dst_address.sin6.sin6_scope_id =
ntohs(dst_address.sin6.sin6_addr.s6_addr16[1]);
dst_address.sin6.sin6_addr.s6_addr16[1] = 0;
}
break;
#endif /* INET6 */
default:

7
sys/netipsec/ipsec_output.c
View File

@ -503,7 +503,14 @@ ipsec_encap(struct mbuf **mp, struct secasindex *saidx)
ip6->ip6_hlim = V_ip6_defhlim;
ip6->ip6_nxt = proto;
ip6->ip6_dst = saidx->dst.sin6.sin6_addr;
/* For link-local address embed scope zone id */
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
ip6->ip6_dst.s6_addr16[1] =
htons(saidx->dst.sin6.sin6_scope_id & 0xffff);
ip6->ip6_src = saidx->src.sin6.sin6_addr;
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1] =
htons(saidx->src.sin6.sin6_scope_id & 0xffff);
ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6));
ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos);
ip6->ip6_flow |= htonl((uint32_t)proto << 20);

43
sys/netipsec/key.c
View File

@ -3856,48 +3856,19 @@ key_ismyaddr(struct sockaddr *sa)
* compare my own address for IPv6.
* 1: ours
* 0: other
* NOTE: derived ip6_input() in KAME. This is necessary to modify more.
*/
#include <netinet6/in6_var.h>
static int
key_ismyaddr6(struct sockaddr_in6 *sin6)
{
struct in6_ifaddr *ia;
#if 0
struct in6_multi *in6m;
#endif
struct in6_addr in6;
IN6_IFADDR_RLOCK();
TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
if (key_sockaddrcmp((struct sockaddr *)sin6,
(struct sockaddr *)&ia->ia_addr, 0) == 0) {
IN6_IFADDR_RUNLOCK();
return 1;
}
if (!IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
return (in6_localip(&sin6->sin6_addr));
#if 0
/*
* XXX Multicast
* XXX why do we care about multlicast here while we don't care
* about IPv4 multicast??
* XXX scope
*/
in6m = NULL;
IN6_LOOKUP_MULTI(sin6->sin6_addr, ia->ia_ifp, in6m);
if (in6m) {
IN6_IFADDR_RUNLOCK();
return 1;
}
#endif
}
IN6_IFADDR_RUNLOCK();
/* loopback, just for safety */
if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
return 1;
return 0;
/* Convert address into kernel-internal form */
in6 = sin6->sin6_addr;
in6.s6_addr16[1] = htons(sin6->sin6_scope_id & 0xffff);
return (in6_localip(&in6));
}
#endif /*INET6*/