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Fix alignment problems -- the embedded v4 address is guaranteed to

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be only 16-bit aligned, so only do byte operations to compare with it.
This commit is contained in:
Bill Fenner 2003-01-05 14:03:26 +00:00
parent a09de2f7cd
commit 2b0e597682
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=108710
1 changed files with 17 additions and 15 deletions
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32
sys/net/if_stf.c
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@ -255,7 +255,7 @@ stf_encapcheck(m, off, proto, arg)
struct ip ip;
struct in6_ifaddr *ia6;
struct stf_softc *sc;
struct in_addr a, b;
struct in_addr a, b, mask;
sc = (struct stf_softc *)arg;
if (sc == NULL)
@ -297,10 +297,11 @@ stf_encapcheck(m, off, proto, arg)
* fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
*/
bzero(&a, sizeof(a));
a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
bcopy(GET_V4(&ia6->ia_addr.sin6_addr), &a, sizeof(a));
bcopy(GET_V4(&ia6->ia_prefixmask.sin6_addr), &mask, sizeof(mask));
a.s_addr &= mask.s_addr;
b = ip.ip_src;
b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
b.s_addr &= mask.s_addr;
if (a.s_addr != b.s_addr)
return 0;
@ -487,15 +488,17 @@ stf_output(ifp, m, dst, rt)
static int
isrfc1918addr(in)
struct in_addr *in;
struct in_addr *in; /* 16-bit aligned */
{
u_char *a = (u_char *)in;
/*
* returns 1 if private address range:
* 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
*/
if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
(ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
(ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)
if (a[0] == 10 ||
(a[0] == 172 && (a[1] & 0xf0) == 16) ||
(a[1] == 192 && a[1] == 168))
return 1;
return 0;
@ -504,21 +507,20 @@ isrfc1918addr(in)
static int
stf_checkaddr4(sc, in, inifp)
struct stf_softc *sc;
struct in_addr *in;
struct in_addr *in; /* 16-bit aligned */
struct ifnet *inifp; /* incoming interface */
{
struct in_ifaddr *ia4;
u_char *a = (u_char *)in;
/*
* reject packets with the following address:
* 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
*/
if (IN_MULTICAST(ntohl(in->s_addr)))
if ((a[0] & 0xf0) == 0xe0)
return -1;
switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
case 0: case 127: case 255:
if (a[0] == 0 || a[0] == 127 || a[0] == 255)
return -1;
}
/*
* reject packets with private address range.
@ -536,7 +538,7 @@ stf_checkaddr4(sc, in, inifp)
{
if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
continue;
if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
if (bcmp(in, &ia4->ia_broadaddr.sin_addr, sizeof(*in)) == 0)
return -1;
}
@ -550,7 +552,7 @@ stf_checkaddr4(sc, in, inifp)
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(struct sockaddr_in);
sin.sin_addr = *in;
bcopy(in, &sin.sin_addr, sizeof(*in));
rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
if (!rt || rt->rt_ifp != inifp) {
#if 0