Replace aux mbufs with packet tags:

o instead of a list of mbufs use a list of m_tag structures a la openbsd
o for netgraph et. al. extend the stock openbsd m_tag to include a 32-bit
  ABI/module number cookie
o for openbsd compatibility define a well-known cookie MTAG_ABI_COMPAT and
  use this in defining openbsd-compatible m_tag_find and m_tag_get routines
o rewrite KAME use of aux mbufs in terms of packet tags
o eliminate the most heavily used aux mbufs by adding an additional struct
  inpcb parameter to ip_output and ip6_output to allow the IPsec code to
  locate the security policy to apply to outbound packets
o bump __FreeBSD_version so code can be conditionalized
o fixup ipfilter's call to ip_output based on __FreeBSD_version

Reviewed by:	julian, luigi (silent), -arch, -net, darren
Approved by:	julian, silence from everyone else
Obtained from:	openbsd (mostly)
MFC after:	1 month

4 files changed, 4 insertions, 5 deletions

diff --git a/sys/net/bridge.c b/sys/net/bridge.c
index e41d8c7..1a59cee 100644
--- a/sys/net/bridge.c
+++ b/sys/net/bridge.c
@@ -816,7 +816,7 @@ bdg_forward(struct mbuf *m0, struct ether_header *const eh, struct ifnet *dst)
     args.rule = NULL;		/* did we match a firewall rule ? */
     /* Fetch state from dummynet tag, ignore others */
     for (;m0->m_type == MT_TAG; m0 = m0->m_next)
-	if (m0->m_tag_id == PACKET_TAG_DUMMYNET) {
+	if (m0->_m_tag_id == PACKET_TAG_DUMMYNET) {
 	    args.rule = ((struct dn_pkt *)m0)->rule;
 	    shared = 0;		/* For sure this is our own mbuf. */
 	}
diff --git a/sys/net/if_gre.c b/sys/net/if_gre.c
index dfa9ddb..a8231c0 100644
--- a/sys/net/if_gre.c
+++ b/sys/net/if_gre.c
@@ -384,7 +384,7 @@ gre_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 	ifp->if_opackets++;
 	ifp->if_obytes += m->m_pkthdr.len;
 	/* send it off */
-	error = ip_output(m, NULL, &sc->route, 0, NULL);
+	error = ip_output(m, NULL, &sc->route, 0, NULL, NULL);
   end:
 	sc->called = 0;
 	if (error)
diff --git a/sys/net/if_loop.c b/sys/net/if_loop.c
index 1184e9c..57571a8 100644
--- a/sys/net/if_loop.c
+++ b/sys/net/if_loop.c
@@ -224,8 +224,7 @@ looutput(ifp, m, dst, rt)
 		m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
 		n->m_pkthdr = m->m_pkthdr;
 		n->m_len = m->m_pkthdr.len;
-		n->m_pkthdr.aux = m->m_pkthdr.aux;
-		m->m_pkthdr.aux = (struct mbuf *)NULL;
+		SLIST_INIT(&m->m_pkthdr.tags);
 		m_freem(m);
 		m = n;
 	}
diff --git a/sys/net/if_stf.c b/sys/net/if_stf.c
index dcbd14c..1acc0a6 100644
--- a/sys/net/if_stf.c
+++ b/sys/net/if_stf.c
@@ -471,7 +471,7 @@ stf_output(ifp, m, dst, rt)
 	}
 
 	ifp->if_opackets++;
-	return ip_output(m, NULL, &sc->sc_ro, 0, NULL);
+	return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
 }
 
 static int