From 0c458752ceee14818034df7bfcdfb04129dceeda Mon Sep 17 00:00:00 2001 From: Yannis Planus Date: Thu, 28 Jan 2021 14:59:07 +0100 Subject: pf: duplicate frames only once when using dup-to pf rule MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When using DUP-TO rule, frames are duplicated 3 times on both output interfaces and duplication interface. Add a flag to not duplicate a duplicated frame. Inspired by a patch from Miłosz Kaniewski milosz.kaniewski at gmail.com https://lists.freebsd.org/pipermail/freebsd-pf/2015-November/007886.html Reviewed by: kp@ Differential Revision: https://reviews.freebsd.org/D27018 --- sys/netpfil/pf/pf.c | 50 ++++++++++++++++++++++++++++++++++++++++++------ sys/netpfil/pf/pf_mtag.h | 1 + 2 files changed, 45 insertions(+), 6 deletions(-) diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c index 4cccb0101650..86354e69d11f 100644 --- a/sys/netpfil/pf/pf.c +++ b/sys/netpfil/pf/pf.c @@ -5488,10 +5488,29 @@ pf_route(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp, } if (r->rt == PF_DUPTO) { - if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { - if (s) + if ((pd->pf_mtag->flags & PF_DUPLICATED)) { + if (s == NULL) { + ifp = r->rpool.cur->kif ? + r->rpool.cur->kif->pfik_ifp : NULL; + } else { + ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; PF_STATE_UNLOCK(s); - return; + } + if (ifp == oifp) { + /* When the 2nd interface is not skipped */ + return; + } else { + m0 = *m; + *m = NULL; + goto bad; + } + } else { + pd->pf_mtag->flags |= PF_DUPLICATED; + if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { + if (s) + PF_STATE_UNLOCK(s); + return; + } } } else { if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { @@ -5649,10 +5668,29 @@ pf_route6(struct mbuf **m, struct pf_krule *r, int dir, struct ifnet *oifp, } if (r->rt == PF_DUPTO) { - if ((m0 = m_dup(*m, M_NOWAIT)) == NULL) { - if (s) + if ((pd->pf_mtag->flags & PF_DUPLICATED)) { + if (s == NULL) { + ifp = r->rpool.cur->kif ? + r->rpool.cur->kif->pfik_ifp : NULL; + } else { + ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL; PF_STATE_UNLOCK(s); - return; + } + if (ifp == oifp) { + /* When the 2nd interface is not skipped */ + return; + } else { + m0 = *m; + *m = NULL; + goto bad; + } + } else { + pd->pf_mtag->flags |= PF_DUPLICATED; + if (((m0 = m_dup(*m, M_NOWAIT)) == NULL)) { + if (s) + PF_STATE_UNLOCK(s); + return; + } } } else { if ((r->rt == PF_REPLYTO) == (r->direction == dir)) { diff --git a/sys/netpfil/pf/pf_mtag.h b/sys/netpfil/pf/pf_mtag.h index 67c79350e8eb..ad28ab7a7c30 100644 --- a/sys/netpfil/pf/pf_mtag.h +++ b/sys/netpfil/pf/pf_mtag.h @@ -42,6 +42,7 @@ #define PF_PACKET_LOOPED 0x08 #define PF_FASTFWD_OURS_PRESENT 0x10 #define PF_REASSEMBLED 0x20 +#define PF_DUPLICATED 0x40 struct pf_mtag { void *hdr; /* saved hdr pos in mbuf, for ECN */ -- cgit v1.2.3