From b560580a13b180bc1e3cad7ffbc93388cc39be5d Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Sat, 7 Jul 2007 22:35:56 -0700 Subject: [NETFILTER]: nf_conntrack_expect: maintain per conntrack expectation list This patch brings back the per-conntrack expectation list that was removed around 2.6.10 to avoid walking all expectations on expectation eviction and conntrack destruction. As these were the last users of the global expectation list, this patch also kills that. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/netfilter/nf_conntrack_core.c | 18 ++++------------ net/netfilter/nf_conntrack_expect.c | 40 ++++++++++++++++++------------------ net/netfilter/nf_conntrack_helper.c | 13 ++++++++++++ net/netfilter/nf_conntrack_netlink.c | 4 ++-- 4 files changed, 39 insertions(+), 36 deletions(-) (limited to 'net') diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index ed44a09ae739..d1fc019760a1 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -502,12 +502,9 @@ init_conntrack(const struct nf_conntrack_tuple *tuple, __set_bit(IPS_EXPECTED_BIT, &conntrack->status); conntrack->master = exp->master; if (exp->helper) { - help = nf_ct_ext_add(conntrack, NF_CT_EXT_HELPER, - GFP_ATOMIC); + help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC); if (help) rcu_assign_pointer(help->helper, exp->helper); - else - DEBUGP("failed to add helper extension area"); } #ifdef CONFIG_NF_CONNTRACK_MARK @@ -523,14 +520,9 @@ init_conntrack(const struct nf_conntrack_tuple *tuple, helper = __nf_ct_helper_find(&repl_tuple); if (helper) { - help = nf_ct_ext_add(conntrack, NF_CT_EXT_HELPER, - GFP_ATOMIC); + help = nf_ct_helper_ext_add(conntrack, GFP_ATOMIC); if (help) - /* not in hash table yet, so not strictly - necessary */ rcu_assign_pointer(help->helper, helper); - else - DEBUGP("failed to add helper extension area"); } NF_CT_STAT_INC(new); } @@ -721,11 +713,9 @@ void nf_conntrack_alter_reply(struct nf_conn *ct, } if (help == NULL) { - help = nf_ct_ext_add(ct, NF_CT_EXT_HELPER, GFP_ATOMIC); - if (help == NULL) { - DEBUGP("failed to add helper extension area"); + help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); + if (help == NULL) goto out; - } } else { memset(&help->help, 0, sizeof(help->help)); } diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c index c5006b0a4e65..5ef0dd439e76 100644 --- a/net/netfilter/nf_conntrack_expect.c +++ b/net/netfilter/nf_conntrack_expect.c @@ -27,9 +27,6 @@ #include #include -LIST_HEAD(nf_ct_expect_list); -EXPORT_SYMBOL_GPL(nf_ct_expect_list); - struct hlist_head *nf_ct_expect_hash __read_mostly; EXPORT_SYMBOL_GPL(nf_ct_expect_hash); @@ -52,13 +49,14 @@ void nf_ct_unlink_expect(struct nf_conntrack_expect *exp) NF_CT_ASSERT(master_help); NF_CT_ASSERT(!timer_pending(&exp->timeout)); - list_del(&exp->list); hlist_del(&exp->hnode); nf_ct_expect_count--; - NF_CT_STAT_INC(expect_delete); + hlist_del(&exp->lnode); master_help->expecting--; nf_ct_expect_put(exp); + + NF_CT_STAT_INC(expect_delete); } EXPORT_SYMBOL_GPL(nf_ct_unlink_expect); @@ -153,17 +151,18 @@ nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple) /* delete all expectations for this conntrack */ void nf_ct_remove_expectations(struct nf_conn *ct) { - struct nf_conntrack_expect *i, *tmp; struct nf_conn_help *help = nfct_help(ct); + struct nf_conntrack_expect *exp; + struct hlist_node *n, *next; /* Optimization: most connection never expect any others. */ if (!help || help->expecting == 0) return; - list_for_each_entry_safe(i, tmp, &nf_ct_expect_list, list) { - if (i->master == ct && del_timer(&i->timeout)) { - nf_ct_unlink_expect(i); - nf_ct_expect_put(i); + hlist_for_each_entry_safe(exp, n, next, &help->expectations, lnode) { + if (del_timer(&exp->timeout)) { + nf_ct_unlink_expect(exp); + nf_ct_expect_put(exp); } } } @@ -289,9 +288,10 @@ static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) unsigned int h = nf_ct_expect_dst_hash(&exp->tuple); atomic_inc(&exp->use); + + hlist_add_head(&exp->lnode, &master_help->expectations); master_help->expecting++; - list_add(&exp->list, &nf_ct_expect_list); hlist_add_head(&exp->hnode, &nf_ct_expect_hash[h]); nf_ct_expect_count++; @@ -308,16 +308,16 @@ static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) /* Race with expectations being used means we could have none to find; OK. */ static void evict_oldest_expect(struct nf_conn *master) { - struct nf_conntrack_expect *i; + struct nf_conn_help *master_help = nfct_help(master); + struct nf_conntrack_expect *exp = NULL; + struct hlist_node *n; - list_for_each_entry_reverse(i, &nf_ct_expect_list, list) { - if (i->master == master) { - if (del_timer(&i->timeout)) { - nf_ct_unlink_expect(i); - nf_ct_expect_put(i); - } - break; - } + hlist_for_each_entry(exp, n, &master_help->expectations, lnode) + ; /* nothing */ + + if (exp && del_timer(&exp->timeout)) { + nf_ct_unlink_expect(exp); + nf_ct_expect_put(exp); } } diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c index cc8ae7404ac4..66c209d7e09d 100644 --- a/net/netfilter/nf_conntrack_helper.c +++ b/net/netfilter/nf_conntrack_helper.c @@ -87,6 +87,19 @@ __nf_conntrack_helper_find_byname(const char *name) } EXPORT_SYMBOL_GPL(__nf_conntrack_helper_find_byname); +struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp) +{ + struct nf_conn_help *help; + + help = nf_ct_ext_add(ct, NF_CT_EXT_HELPER, gfp); + if (help) + INIT_HLIST_HEAD(&help->expectations); + else + pr_debug("failed to add helper extension area"); + return help; +} +EXPORT_SYMBOL_GPL(nf_ct_helper_ext_add); + static inline int unhelp(struct nf_conntrack_tuple_hash *i, const struct nf_conntrack_helper *me) { diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index 60af9b6b9e00..6f89b105a205 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -868,7 +868,7 @@ ctnetlink_change_helper(struct nf_conn *ct, struct nfattr *cda[]) /* need to zero data of old helper */ memset(&help->help, 0, sizeof(help->help)); } else { - help = nf_ct_ext_add(ct, NF_CT_EXT_HELPER, GFP_KERNEL); + help = nf_ct_helper_ext_add(ct, GFP_KERNEL); if (help == NULL) return -ENOMEM; } @@ -989,7 +989,7 @@ ctnetlink_create_conntrack(struct nfattr *cda[], helper = nf_ct_helper_find_get(rtuple); if (helper) { - help = nf_ct_ext_add(ct, NF_CT_EXT_HELPER, GFP_KERNEL); + help = nf_ct_helper_ext_add(ct, GFP_KERNEL); if (help == NULL) { nf_ct_helper_put(helper); err = -ENOMEM; -- cgit v1.2.3