Date: Sun, 5 Nov 2023 19:36:43 GMT From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 35af22ac986c - main - if_tuntap: trigger the bpf hook on transmitting for the tap interface Message-ID: <202311051936.3A5Jahbi039287@gitrepo.freebsd.org>
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The branch main has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=35af22ac986c4f3e8160c943a478492e748b6f23 commit 35af22ac986c4f3e8160c943a478492e748b6f23 Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2023-11-05 19:32:46 +0000 Commit: Michael Tuexen <tuexen@FreeBSD.org> CommitDate: 2023-11-05 19:32:46 +0000 if_tuntap: trigger the bpf hook on transmitting for the tap interface The tun interface triggers the bpf hook when a packet is transmitted, the tap interface triggers it when the packet is read from the character device. This is inconsistent. So fix the tap device such that it behaves like the tun device. This is needed for adding support for the tap device to packetdrill. Reviewed by: kevans, rscheff MFC after: 1 week Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D42467 --- sys/net/if_tuntap.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/sys/net/if_tuntap.c b/sys/net/if_tuntap.c index 3eeaadb83a20..a865c23cb372 100644 --- a/sys/net/if_tuntap.c +++ b/sys/net/if_tuntap.c @@ -933,6 +933,16 @@ tunstart_l2(struct ifnet *ifp) TUN_UNLOCK(tp); } /* tunstart_l2 */ +static int +tap_transmit(struct ifnet *ifp, struct mbuf *m) +{ + int error; + + BPF_MTAP(ifp, m); + IFQ_HANDOFF(ifp, m, error); + return (error); +} + /* XXX: should return an error code so it can fail. */ static void tuncreate(struct cdev *dev) @@ -972,6 +982,8 @@ tuncreate(struct cdev *dev) if ((tp->tun_flags & TUN_L2) != 0) { ifp->if_init = tunifinit; ifp->if_start = tunstart_l2; + ifp->if_transmit = tap_transmit; + ifp->if_qflush = if_qflush; ether_gen_addr(ifp, &eaddr); ether_ifattach(ifp, eaddr.octet); @@ -1713,9 +1725,6 @@ tunread(struct cdev *dev, struct uio *uio, int flag) } TUN_UNLOCK(tp); - if ((tp->tun_flags & TUN_L2) != 0) - BPF_MTAP(ifp, m); - len = min(tp->tun_vhdrlen, uio->uio_resid); if (len > 0) { struct virtio_net_hdr_mrg_rxbuf vhdr;
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