From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Neira Ayuso Subject: [PATCH 7/10][CTNETLINK] send conntrack events on ctnetlink actions Date: Fri, 07 Jul 2006 04:15:50 +0200 Message-ID: <44ADC3D6.2010806@netfilter.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------010207080108070808030007" Cc: Patrick McHardy Return-path: To: Netfilter Development Mailinglist List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: netfilter-devel-bounces@lists.netfilter.org Errors-To: netfilter-devel-bounces@lists.netfilter.org List-Id: netfilter-devel.vger.kernel.org This is a multi-part message in MIME format. --------------010207080108070808030007 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Currently only conntrack events generated by the conntrack core are delivered to userspace via ctnetlink. This patch force the generation of event notifications on ctnetlink actions. Example scenario: you have two process listening to ctnetlink and one of them creates/changes/destroy a conntrack upon certain events Signed-off-by: Pablo Neira Ayuso -- The dawn of the fourth age of Linux firewalling is coming; a time of great struggle and heroic deeds -- J.Kadlecsik got inspired by J.Morris --------------010207080108070808030007 Content-Type: text/plain; name="07events.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="07events.patch" [CTNETLINK] send conntrack events on ctnetlink actions Currently only conntrack events generated by the conntrack core are delivered to userspace via ctnetlink. This patch force the generation of event notifications on ctnetlink actions. Signed-off-by: Pablo Neira Ayuso Index: net-2.6/net/ipv4/netfilter/ip_conntrack_netlink.c =================================================================== --- net-2.6.orig/net/ipv4/netfilter/ip_conntrack_netlink.c 2006-07-07 02:11:42.000000000 +0200 +++ net-2.6/net/ipv4/netfilter/ip_conntrack_netlink.c 2006-07-07 02:11:43.000000000 +0200 @@ -986,7 +986,9 @@ ctnetlink_change_protoinfo(struct ip_con } static int -ctnetlink_change_conntrack(struct ip_conntrack *ct, struct nfattr *cda[]) +ctnetlink_change_conntrack(struct ip_conntrack *ct, + struct nfattr *cda[], + unsigned int *changeset) { int err; @@ -996,29 +998,35 @@ ctnetlink_change_conntrack(struct ip_con err = ctnetlink_change_helper(ct, cda); if (err < 0) return err; + *changeset |= IPCT_HELPER; } if (cda[CTA_TIMEOUT-1]) { err = ctnetlink_change_timeout(ct, cda); if (err < 0) return err; + *changeset |= IPCT_REFRESH; } if (cda[CTA_STATUS-1]) { err = ctnetlink_change_status(ct, cda); if (err < 0) return err; + *changeset |= IPCT_STATUS; } if (cda[CTA_PROTOINFO-1]) { err = ctnetlink_change_protoinfo(ct, cda); if (err < 0) return err; + *changeset |= IPCT_PROTOINFO; } #if defined(CONFIG_IP_NF_CONNTRACK_MARK) - if (cda[CTA_MARK-1]) + if (cda[CTA_MARK-1]) { ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); + *changeset |= IPCT_MARK; + } #endif DEBUGP("all done\n"); @@ -1032,6 +1040,7 @@ ctnetlink_create_conntrack(struct nfattr { struct ip_conntrack *ct; int err = -EINVAL; + unsigned int changeset = IPCT_NEW|IPCT_REFRESH|IPCT_STATUS; DEBUGP("entered %s\n", __FUNCTION__); @@ -1054,12 +1063,17 @@ ctnetlink_create_conntrack(struct nfattr err = ctnetlink_change_protoinfo(ct, cda); if (err < 0) return err; + changeset |= IPCT_PROTOINFO; } #if defined(CONFIG_IP_NF_CONNTRACK_MARK) - if (cda[CTA_MARK-1]) + if (cda[CTA_MARK-1]) { ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); + changeset |= IPCT_MARK; + } #endif + /* increase refcount to 2 for event notification */ + atomic_inc(&ct->ct_general.use); /* we do no want any races on hash insertion */ write_lock_bh(&ip_conntrack_lock); @@ -1068,6 +1082,10 @@ ctnetlink_create_conntrack(struct nfattr add_timer(&ct->timeout); write_unlock_bh(&ip_conntrack_lock); + /* now, notify the creation of this conntrack */ + ip_conntrack_event(changeset, ct); + ip_conntrack_put(ct); + DEBUGP("conntrack with id %u inserted\n", ct->id); return 0; @@ -1083,6 +1101,7 @@ ctnetlink_new_conntrack(struct sock *ctn struct ip_conntrack_tuple otuple, rtuple; struct ip_conntrack_tuple_hash *h = NULL; int err = 0; + unsigned int changeset = 0; DEBUGP("entered %s\n", __FUNCTION__); @@ -1108,30 +1127,36 @@ ctnetlink_new_conntrack(struct sock *ctn h = __ip_conntrack_find(&rtuple, NULL); if (h == NULL) { + /* create new conntrack */ write_unlock_bh(&ip_conntrack_lock); DEBUGP("no such conntrack, create new\n"); err = -ENOENT; if (nlh->nlmsg_flags & NLM_F_CREATE) err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); - return err; - } - /* implicit 'else' */ + } else { + /* update existing conntrack */ + struct ip_conntrack *ct = tuplehash_to_ctrack(h); - /* we only allow nat config for new conntracks */ - if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { - err = -EINVAL; - goto out_unlock; - } + /* we only allow nat config for new conntracks */ + if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { + write_unlock_bh(&ip_conntrack_lock); + return -EINVAL; + } - /* We manipulate the conntrack inside the global conntrack table lock, - * so there's no need to increase the refcount */ - DEBUGP("conntrack found\n"); - err = -EEXIST; - if (!(nlh->nlmsg_flags & NLM_F_EXCL)) - err = ctnetlink_change_conntrack(tuplehash_to_ctrack(h), cda); + DEBUGP("conntrack found\n"); + err = -EEXIST; + if (!(nlh->nlmsg_flags & NLM_F_EXCL)) + err = ctnetlink_change_conntrack(ct, cda, &changeset); -out_unlock: - write_unlock_bh(&ip_conntrack_lock); + atomic_inc(&ct->ct_general.use); + write_unlock_bh(&ip_conntrack_lock); + + /* report update event if no error happened */ + if (err >= 0) + ip_conntrack_event(changeset, ct); + + ip_conntrack_put(ct); + } return err; } @@ -1523,6 +1548,7 @@ ctnetlink_create_expect(struct nfattr *c memcpy(&exp->mask, &mask, sizeof(struct ip_conntrack_tuple)); err = ip_conntrack_expect_related(exp); + ip_conntrack_expect_event(IPEXP_NEW, exp); ip_conntrack_expect_put(exp); out: Index: net-2.6/net/ipv4/netfilter/ip_conntrack_core.c =================================================================== --- net-2.6.orig/net/ipv4/netfilter/ip_conntrack_core.c 2006-07-07 02:10:13.000000000 +0200 +++ net-2.6/net/ipv4/netfilter/ip_conntrack_core.c 2006-07-07 02:11:43.000000000 +0200 @@ -1324,6 +1324,7 @@ static struct nf_sockopt_ops so_getorigd static int kill_all(struct ip_conntrack *i, void *data) { + ip_conntrack_event(IPCT_DESTROY, i); return 1; } Index: net-2.6/net/netfilter/nf_conntrack_netlink.c =================================================================== --- net-2.6.orig/net/netfilter/nf_conntrack_netlink.c 2006-07-07 02:11:42.000000000 +0200 +++ net-2.6/net/netfilter/nf_conntrack_netlink.c 2006-07-07 02:12:16.000000000 +0200 @@ -1006,7 +1006,9 @@ ctnetlink_change_protoinfo(struct nf_con } static int -ctnetlink_change_conntrack(struct nf_conn *ct, struct nfattr *cda[]) +ctnetlink_change_conntrack(struct nf_conn *ct, + struct nfattr *cda[], + unsigned int *changeset) { int err; @@ -1016,29 +1018,35 @@ ctnetlink_change_conntrack(struct nf_con err = ctnetlink_change_helper(ct, cda); if (err < 0) return err; + *changeset |= IPCT_HELPER; } if (cda[CTA_TIMEOUT-1]) { err = ctnetlink_change_timeout(ct, cda); if (err < 0) return err; + *changeset |= IPCT_REFRESH; } if (cda[CTA_STATUS-1]) { err = ctnetlink_change_status(ct, cda); if (err < 0) return err; + *changeset |= IPCT_STATUS; } if (cda[CTA_PROTOINFO-1]) { err = ctnetlink_change_protoinfo(ct, cda); if (err < 0) return err; + *changeset |= IPCT_PROTOINFO; } #if defined(CONFIG_NF_CONNTRACK_MARK) - if (cda[CTA_MARK-1]) + if (cda[CTA_MARK-1]) { ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); + *changeset |= IPCT_MARK; + } #endif DEBUGP("all done\n"); @@ -1052,6 +1060,7 @@ ctnetlink_create_conntrack(struct nfattr { struct nf_conn *ct; int err = -EINVAL; + unsigned int changeset = IPCT_NEW|IPCT_REFRESH|IPCT_STATUS; DEBUGP("entered %s\n", __FUNCTION__); @@ -1074,20 +1083,28 @@ ctnetlink_create_conntrack(struct nfattr err = ctnetlink_change_protoinfo(ct, cda); if (err < 0) return err; + changeset |= IPCT_PROTOINFO; } #if defined(CONFIG_NF_CONNTRACK_MARK) - if (cda[CTA_MARK-1]) + if (cda[CTA_MARK-1]) { ct->mark = ntohl(*(u_int32_t *)NFA_DATA(cda[CTA_MARK-1])); + changeset |= IPCT_MARK; + } #endif + /* increase refcount to 2 for event notification */ + atomic_inc(&ct->ct_general.use); /* we do no want any races on hash insertion */ write_lock_bh(&nf_conntrack_lock); - ct->helper = nf_conntrack_helper_find(rtuple); nf_conntrack_hash_insert(ct); add_timer(&ct->timeout); write_unlock_bh(&nf_conntrack_lock); + /* now, notify the creation of this conntrack */ + nf_conntrack_event(changeset, ct); + nf_ct_put(ct); + DEBUGP("conntrack with id %u inserted\n", ct->id); return 0; @@ -1105,6 +1122,7 @@ ctnetlink_new_conntrack(struct sock *ctn struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); u_int8_t u3 = nfmsg->nfgen_family; int err = 0; + unsigned int changeset = 0; DEBUGP("entered %s\n", __FUNCTION__); @@ -1130,30 +1148,36 @@ ctnetlink_new_conntrack(struct sock *ctn h = __nf_conntrack_find(&rtuple, NULL); if (h == NULL) { + /* create new conntrack */ write_unlock_bh(&nf_conntrack_lock); DEBUGP("no such conntrack, create new\n"); err = -ENOENT; if (nlh->nlmsg_flags & NLM_F_CREATE) err = ctnetlink_create_conntrack(cda, &otuple, &rtuple); - return err; - } - /* implicit 'else' */ + } else { + /* update existing conntrack */ + struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); - /* we only allow nat config for new conntracks */ - if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { - err = -EINVAL; - goto out_unlock; - } + /* we only allow nat config for new conntracks */ + if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) { + write_unlock_bh(&nf_conntrack_lock); + return -EINVAL; + } - /* We manipulate the conntrack inside the global conntrack table lock, - * so there's no need to increase the refcount */ - DEBUGP("conntrack found\n"); - err = -EEXIST; - if (!(nlh->nlmsg_flags & NLM_F_EXCL)) - err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda); + DEBUGP("conntrack found\n"); + err = -EEXIST; + if (!(nlh->nlmsg_flags & NLM_F_EXCL)) + err = ctnetlink_change_conntrack(ct, cda, &changeset); -out_unlock: - write_unlock_bh(&nf_conntrack_lock); + atomic_inc(&ct->ct_general.use); + write_unlock_bh(&nf_conntrack_lock); + + /* report update event if no error happened */ + if (err >= 0) + nf_conntrack_event(changeset, ct); + + nf_ct_put(ct); + } return err; } @@ -1556,6 +1580,7 @@ ctnetlink_create_expect(struct nfattr *c memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple)); err = nf_conntrack_expect_related(exp); + nf_conntrack_expect_event(IPEXP_NEW, exp); nf_conntrack_expect_put(exp); out: Index: net-2.6/net/netfilter/nf_conntrack_core.c =================================================================== --- net-2.6.orig/net/netfilter/nf_conntrack_core.c 2006-07-07 02:10:28.000000000 +0200 +++ net-2.6/net/netfilter/nf_conntrack_core.c 2006-07-07 02:11:43.000000000 +0200 @@ -1525,6 +1525,7 @@ nf_ct_iterate_cleanup(int (*iter)(struct static int kill_all(struct nf_conn *i, void *data) { + nf_conntrack_event(IPCT_DESTROY, i); return 1; } --------------010207080108070808030007--