From owner-svn-src-all@freebsd.org Tue Nov 20 10:43:19 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 71F86110D43A; Tue, 20 Nov 2018 10:43:19 +0000 (UTC) (envelope-from eugen@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 16CC685B92; Tue, 20 Nov 2018 10:43:19 +0000 (UTC) (envelope-from eugen@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id EC64A10438; Tue, 20 Nov 2018 10:43:18 +0000 (UTC) (envelope-from eugen@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wAKAhIih005135; Tue, 20 Nov 2018 10:43:18 GMT (envelope-from eugen@FreeBSD.org) Received: (from eugen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wAKAhI6B005134; Tue, 20 Nov 2018 10:43:18 GMT (envelope-from eugen@FreeBSD.org) Message-Id: <201811201043.wAKAhI6B005134@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: eugen set sender to eugen@FreeBSD.org using -f From: Eugene Grosbein Date: Tue, 20 Nov 2018 10:43:18 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r340669 - stable/12/sys/netinet X-SVN-Group: stable-12 X-SVN-Commit-Author: eugen X-SVN-Commit-Paths: stable/12/sys/netinet X-SVN-Commit-Revision: 340669 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 16CC685B92 X-Spamd-Result: default: False [0.61 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-0.01)[-0.012,0]; NEURAL_SPAM_SHORT(0.62)[0.617,0]; NEURAL_SPAM_LONG(0.01)[0.007,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Nov 2018 10:43:19 -0000 Author: eugen Date: Tue Nov 20 10:43:18 2018 New Revision: 340669 URL: https://svnweb.freebsd.org/changeset/base/340669 Log: MFC r339558: New sysctl: net.inet.icmp.error_keeptags Currently, icmp_error() function copies FIB number from original packet into generated ICMP response but not mbuf_tags(9) chain. This prevents us from easily matching ICMP responses corresponding to tagged original packets by means of packet filter such as ipfw(8). For example, ICMP "time-exceeded in-transit" packets usually generated in response to traceroute probes lose tags attached to original packets. This change adds new sysctl net.inet.icmp.error_keeptags that defaults to 0 to avoid extra overhead when this feature not needed. Set net.inet.icmp.error_keeptags=1 to make icmp_error() copy mbuf_tags from original packet to generated ICMP response. PR: 215874 Modified: stable/12/sys/netinet/ip_icmp.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet/ip_icmp.c ============================================================================== --- stable/12/sys/netinet/ip_icmp.c Tue Nov 20 10:01:56 2018 (r340668) +++ stable/12/sys/netinet/ip_icmp.c Tue Nov 20 10:43:18 2018 (r340669) @@ -158,6 +158,12 @@ SYSCTL_INT(_net_inet_icmp, OID_AUTO, tstamprepl, CTLFL &VNET_NAME(icmptstamprepl), 0, "Respond to ICMP Timestamp packets"); +VNET_DEFINE_STATIC(int, error_keeptags) = 0; +#define V_error_keeptags VNET(error_keeptags) +SYSCTL_INT(_net_inet_icmp, OID_AUTO, error_keeptags, CTLFLAG_VNET | CTLFLAG_RW, + &VNET_NAME(error_keeptags), 0, + "ICMP error response keeps copy of mbuf_tags of original packet"); + #ifdef ICMPPRINTFS int icmpprintfs = 0; #endif @@ -370,6 +376,10 @@ stdreply: icmpelen = max(8, min(V_icmp_quotelen, ntohs nip->ip_p = IPPROTO_ICMP; nip->ip_tos = 0; nip->ip_off = 0; + + if (V_error_keeptags) + m_tag_copy_chain(m, n, M_NOWAIT); + icmp_reflect(m); freeit: