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When multiple interfaces exist in the system, with each interface having

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an IPv6 address assigned to it, and if an incoming packet received on
one interface has a packet destination address that belongs to another
interface, the routing table is consulted to determine how to reach this
packet destination. Since the packet destination is an interface address,
the route table will return a host route with the loopback interface as
rt_ifp. The input code must recognize this fact, instead of using the
loopback interface, the input code performs a search to find the right
interface that owns the given IPv6 address.

Reviewed by:	bz, gnn, kmacy
MFC after:	immediately
This commit is contained in:
qingli 2009-08-26 21:32:50 +00:00
parent a3275cab81
commit 487e2c0d00
1 changed files with 25 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
sys/netinet6/ip6_input.c
View File

@ -628,8 +628,27 @@ ip6_input(struct mbuf *m)
&rt6_key(rin6.ro_rt)->sin6_addr)
#endif
rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) {
struct in6_ifaddr *ia6 =
(struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
int free_ia6 = 0;
struct in6_ifaddr *ia6;
/*
* found the loopback route to the interface address
*/
if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) {
struct sockaddr_in6 dest6;
bzero(&dest6, sizeof(dest6));
dest6.sin6_family = AF_INET6;
dest6.sin6_len = sizeof(dest6);
dest6.sin6_addr = ip6->ip6_dst;
ia6 = (struct in6_ifaddr *)
ifa_ifwithaddr((struct sockaddr *)&dest6);
if (ia6 == NULL)
goto bad;
free_ia6 = 1;
}
else
ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa;
/*
* record address information into m_tag.
@ -647,6 +666,8 @@ ip6_input(struct mbuf *m)
/* Count the packet in the ip address stats */
ia6->ia_ifa.if_ipackets++;
ia6->ia_ifa.if_ibytes += m->m_pkthdr.len;
if (ia6 != NULL && free_ia6 != 0)
ifa_free(&ia6->ia_ifa);
goto hbhcheck;
} else {
char ip6bufs[INET6_ADDRSTRLEN];
@ -657,6 +678,8 @@ ip6_input(struct mbuf *m)
ip6_sprintf(ip6bufs, &ip6->ip6_src),
ip6_sprintf(ip6bufd, &ip6->ip6_dst)));
if (ia6 != NULL && free_ia6 != 0)
ifa_free(&ia6->ia_ifa);
goto bad;
}
}