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Take source and destination address into account when determining

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the scope.
This fixes a problem when a client with a global address
connects to a server with a private address.
Thanks to Irene Ruengeler in helping me to find the issue.

MFC after: 3 days
This commit is contained in:
Michael Tuexen 2015-05-28 19:28:08 +00:00
parent d60568d78a
commit 0818979a3c
1 changed files with 18 additions and 14 deletions
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32
sys/netinet/sctp_output.c
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@ -5612,7 +5612,8 @@ sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
stc.laddr_type = SCTP_IPV4_ADDRESS;
/* scope_id is only for v6 */
stc.scope_id = 0;
if (IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) {
if ((IN4_ISPRIVATE_ADDRESS(&src4->sin_addr)) ||
(IN4_ISPRIVATE_ADDRESS(&dst4->sin_addr))) {
stc.ipv4_scope = 1;
}
/* Must use the address in this case */
@ -5636,16 +5637,18 @@ sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
stc.local_scope = 0;
stc.site_scope = 1;
stc.ipv4_scope = 1;
} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr)) {
} else if (IN6_IS_ADDR_LINKLOCAL(&src6->sin6_addr) ||
IN6_IS_ADDR_LINKLOCAL(&dst6->sin6_addr)) {
/*
* If the new destination is a
* LINK_LOCAL we must have common
* both site and local scope. Don't
* set local scope though since we
* must depend on the source to be
* added implicitly. We cannot
* assure just because we share one
* link that all links are common.
* If the new destination or source
* is a LINK_LOCAL we must have
* common both site and local scope.
* Don't set local scope though
* since we must depend on the
* source to be added implicitly. We
* cannot assure just because we
* share one link that all links are
* common.
*/
stc.local_scope = 0;
stc.site_scope = 1;
@ -5661,11 +5664,12 @@ sctp_send_initiate_ack(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
* pull out the scope_id from
* incoming pkt
*/
} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr)) {
} else if (IN6_IS_ADDR_SITELOCAL(&src6->sin6_addr) ||
IN6_IS_ADDR_SITELOCAL(&dst6->sin6_addr)) {
/*
* If the new destination is
* SITE_LOCAL then we must have site
* scope in common.
* If the new destination or source
* is SITE_LOCAL then we must have
* site scope in common.
*/
stc.site_scope = 1;
}