Apply by doing:
        cd /usr/src
        patch -p0 < 002_getsockopt.patch

And then rebuild your kernel.

Index: sys/netinet/ip_output.c
===================================================================
RCS file: /cvs/src/sys/netinet/ip_output.c,v
retrieving revision 1.169
retrieving revision 1.169.2.1
diff -u -p -r1.169 -r1.169.2.1
--- sys/netinet/ip_output.c	4 Jan 2005 19:42:38 -0000	1.169
+++ sys/netinet/ip_output.c	14 Jun 2005 02:10:03 -0000	1.169.2.1
@@ -1489,7 +1489,25 @@ ip_ctloutput(op, so, level, optname, mp)
 			if (ipr == NULL)
 				*mtod(m, u_int16_t *) = opt16val;
 			else {
-				m->m_len += ipr->ref_len;
+				size_t len;
+
+				len = m->m_len + ipr->ref_len;
+				if (len > MCLBYTES) {
+					 m_free(m);
+					 error = EINVAL;
+					 break;
+				}
+				/* allocate mbuf cluster for larger option */
+				if (len > MLEN) {
+					 MCLGET(m, M_WAITOK);
+					 if ((m->m_flags & M_EXT) == 0) {
+						 m_free(m);
+						 error = ENOBUFS;
+						 break;
+					 }
+						 
+				}
+				m->m_len = len;
 				*mtod(m, u_int16_t *) = ipr->ref_type;
 				m_copyback(m, sizeof(u_int16_t), ipr->ref_len,
 				    ipr + 1);