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Define semantic of M_SKIP_FIREWALL more precisely, i.e. also pass associated
icmp_error() packets. While here retire PACKET_TAG_PF_GENERATED (which served the same purpose) and use M_SKIP_FIREWALL in pf as well. This should speed up things a bit as we get rid of the tag allocations. Discussed with: juli
This commit is contained in:
Max Laier
parent
b3ea6ecd42
commit
c550f2206d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=132280
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@ -1379,7 +1379,9 @@ pf_send_tcp(const struct pf_rule *r, sa_family_t af,
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u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl)
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{
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struct mbuf *m;
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#ifdef ALTQ
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struct m_tag *mtag;
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#endif
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int len = 0, tlen; /* make the compiler happy */
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#ifdef INET
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struct ip *h = NULL; /* make the compiler happy */
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@ -1412,6 +1414,12 @@ pf_send_tcp(const struct pf_rule *r, sa_family_t af,
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}
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/* create outgoing mbuf */
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#ifdef __FreeBSD__
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m = m_gethdr(M_DONTWAIT, MT_HEADER);
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if (m == NULL)
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return;
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m->m_flags |= M_SKIP_FIREWALL;
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#else
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mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
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if (mtag == NULL)
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return;
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@ -1421,6 +1429,7 @@ pf_send_tcp(const struct pf_rule *r, sa_family_t af,
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return;
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}
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m_tag_prepend(m, mtag);
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#endif
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#ifdef ALTQ
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if (r != NULL && r->qid) {
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struct altq_tag *atag;
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@ -1542,25 +1551,30 @@ void
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pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
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struct pf_rule *r)
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{
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#ifdef ALTQ
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struct m_tag *mtag;
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#endif
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struct mbuf *m0;
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#ifdef __FreeBSD__
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struct ip *ip;
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#endif
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#ifdef __FreeBSD__
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m0 = m_copypacket(m, M_DONTWAIT);
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if (m0 == NULL)
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return;
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m0->m_flags |= M_SKIP_FIREWALL;
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#else
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mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
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if (mtag == NULL)
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return;
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#ifdef __FreeBSD__
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m0 = m_copypacket(m, M_DONTWAIT);
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#else
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m0 = m_copy(m, 0, M_COPYALL);
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#endif
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if (m0 == NULL) {
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m_tag_free(mtag);
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return;
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}
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m_tag_prepend(m0, mtag);
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#endif
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#ifdef ALTQ
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if (r->qid) {
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@ -5436,15 +5450,16 @@ pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
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/* Cheat. */
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if (r->rt == PF_FASTROUTE) {
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mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
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if (mtag == NULL)
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goto bad;
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m_tag_prepend(m0, mtag);
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#ifdef __FreeBSD__
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m0->m_flags |= M_SKIP_FIREWALL;
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PF_UNLOCK();
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ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
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PF_LOCK();
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#else
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mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
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if (mtag == NULL)
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goto bad;
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m_tag_prepend(m0, mtag);
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ip6_output(m0, NULL, NULL, 0, NULL, NULL);
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#endif
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return;
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@ -5788,9 +5803,11 @@ pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
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PF_LOCK();
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#endif
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if (!pf_status.running ||
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(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
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#ifdef __FreeBSD__
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(m->m_flags & M_SKIP_FIREWALL)) {
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PF_UNLOCK();
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#else
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(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
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#endif
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return (PF_PASS);
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}
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@ -6113,9 +6130,11 @@ pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
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#endif
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if (!pf_status.running ||
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(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
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#ifdef __FreeBSD__
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(m->m_flags & M_SKIP_FIREWALL)) {
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PF_UNLOCK();
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#else
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(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
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#endif
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return (PF_PASS);
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}
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@ -144,7 +144,6 @@ icmp_error(n, type, code, dest, destifp)
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register unsigned oiplen = oip->ip_hl << 2;
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register struct icmp *icp;
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register struct mbuf *m;
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register struct m_tag *mtag;
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unsigned icmplen;
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#ifdef ICMPPRINTFS
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@ -224,6 +223,11 @@ icmp_error(n, type, code, dest, destifp)
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*/
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if (m->m_data - sizeof(struct ip) < m->m_pktdat)
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panic("icmp len");
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/*
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* If the original mbuf was meant to bypass the firewall, the error
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* reply should bypass as well.
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*/
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m->m_flags |= n->m_flags & M_SKIP_FIREWALL;
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m->m_data -= sizeof(struct ip);
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m->m_len += sizeof(struct ip);
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m->m_pkthdr.len = m->m_len;
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@ -235,16 +239,6 @@ icmp_error(n, type, code, dest, destifp)
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nip->ip_hl = 5;
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nip->ip_p = IPPROTO_ICMP;
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nip->ip_tos = 0;
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/*
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* XXX: Move PF_GENERATED m_tag to new packet, if it exists.
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* This should be replaced by unified flags/tags for
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* pf/ipfw/ipf and future pfil_hook applications.
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*/
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mtag = m_tag_find(n, PACKET_TAG_PF_GENERATED, NULL);
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if (mtag != NULL) {
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m_tag_unlink(n, mtag);
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m_tag_prepend(m, mtag);
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}
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icmp_reflect(m);
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freeit:
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@ -626,7 +626,6 @@ struct mbuf *m_uiotombuf(struct uio *, int, int);
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#define PACKET_TAG_DIVERT 17 /* divert info */
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#define PACKET_TAG_IPFORWARD 18 /* ipforward info */
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#define PACKET_TAG_MACLABEL (19 | MTAG_PERSISTENT) /* MAC label */
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#define PACKET_TAG_PF_GENERATED (20 | MTAG_PERSISTENT) /* PF, pass always */
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#define PACKET_TAG_PF_ROUTED 21 /* PF routed, avoid loops */
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#define PACKET_TAG_PF_FRAGCACHE 22 /* PF fragment cached */
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#define PACKET_TAG_PF_QID 23 /* PF ALTQ queue id */
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