From 8b13eddfdf04cbfa561725cfc42d6868fe896f56 Mon Sep 17 00:00:00 2001 From: Arturo Borrero Date: Thu, 16 Oct 2014 12:23:29 +0200 Subject: netfilter: refactor NAT redirect IPv4 to use it from nf_tables This patch refactors the IPv4 code so it can be usable both from xt and nf_tables. A similar patch follows-up to handle IPv6. Signed-off-by: Arturo Borrero Gonzalez Signed-off-by: Pablo Neira Ayuso --- net/netfilter/Kconfig | 1 + net/netfilter/xt_REDIRECT.c | 44 ++------------------------------------------ 2 files changed, 3 insertions(+), 42 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index ae5096ab65eb..a0716a3f08b0 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -835,6 +835,7 @@ config NETFILTER_XT_TARGET_RATEEST config NETFILTER_XT_TARGET_REDIRECT tristate "REDIRECT target support" depends on NF_NAT + select NF_NAT_REDIRECT_IPV4 ---help--- REDIRECT is a special case of NAT: all incoming connections are mapped onto the incoming interface's address, causing the packets to diff --git a/net/netfilter/xt_REDIRECT.c b/net/netfilter/xt_REDIRECT.c index 22a10309297c..b4ffac5fe8e9 100644 --- a/net/netfilter/xt_REDIRECT.c +++ b/net/netfilter/xt_REDIRECT.c @@ -26,6 +26,7 @@ #include #include #include +#include static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT; @@ -98,48 +99,7 @@ static int redirect_tg4_check(const struct xt_tgchk_param *par) static unsigned int redirect_tg4(struct sk_buff *skb, const struct xt_action_param *par) { - struct nf_conn *ct; - enum ip_conntrack_info ctinfo; - __be32 newdst; - const struct nf_nat_ipv4_multi_range_compat *mr = par->targinfo; - struct nf_nat_range newrange; - - NF_CT_ASSERT(par->hooknum == NF_INET_PRE_ROUTING || - par->hooknum == NF_INET_LOCAL_OUT); - - ct = nf_ct_get(skb, &ctinfo); - NF_CT_ASSERT(ct && (ctinfo == IP_CT_NEW || ctinfo == IP_CT_RELATED)); - - /* Local packets: make them go to loopback */ - if (par->hooknum == NF_INET_LOCAL_OUT) - newdst = htonl(0x7F000001); - else { - struct in_device *indev; - struct in_ifaddr *ifa; - - newdst = 0; - - rcu_read_lock(); - indev = __in_dev_get_rcu(skb->dev); - if (indev && (ifa = indev->ifa_list)) - newdst = ifa->ifa_local; - rcu_read_unlock(); - - if (!newdst) - return NF_DROP; - } - - /* Transfer from original range. */ - memset(&newrange.min_addr, 0, sizeof(newrange.min_addr)); - memset(&newrange.max_addr, 0, sizeof(newrange.max_addr)); - newrange.flags = mr->range[0].flags | NF_NAT_RANGE_MAP_IPS; - newrange.min_addr.ip = newdst; - newrange.max_addr.ip = newdst; - newrange.min_proto = mr->range[0].min; - newrange.max_proto = mr->range[0].max; - - /* Hand modified range to generic setup. */ - return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); + return nf_nat_redirect_ipv4(skb, par->targinfo, par->hooknum); } static struct xt_target redirect_tg_reg[] __read_mostly = { -- cgit v1.2.3 From 9de920eddb74bf67f1d6af603acc5ed05dcd35e9 Mon Sep 17 00:00:00 2001 From: Arturo Borrero Date: Fri, 17 Oct 2014 12:37:52 +0200 Subject: netfilter: refactor NAT redirect IPv6 code to use it from nf_tables This patch refactors the IPv6 code so it can be usable both from xt and nf_tables. Signed-off-by: Arturo Borrero Gonzalez Signed-off-by: Pablo Neira Ayuso --- net/netfilter/Kconfig | 1 + net/netfilter/xt_REDIRECT.c | 40 ++-------------------------------------- 2 files changed, 3 insertions(+), 38 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index a0716a3f08b0..49deb4edbac6 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -836,6 +836,7 @@ config NETFILTER_XT_TARGET_REDIRECT tristate "REDIRECT target support" depends on NF_NAT select NF_NAT_REDIRECT_IPV4 + select NF_NAT_REDIRECT_IPV6 if IP6_NF_IPTABLES ---help--- REDIRECT is a special case of NAT: all incoming connections are mapped onto the incoming interface's address, causing the packets to diff --git a/net/netfilter/xt_REDIRECT.c b/net/netfilter/xt_REDIRECT.c index b4ffac5fe8e9..b6ec67efd900 100644 --- a/net/netfilter/xt_REDIRECT.c +++ b/net/netfilter/xt_REDIRECT.c @@ -27,48 +27,12 @@ #include #include #include - -static const struct in6_addr loopback_addr = IN6ADDR_LOOPBACK_INIT; +#include static unsigned int redirect_tg6(struct sk_buff *skb, const struct xt_action_param *par) { - const struct nf_nat_range *range = par->targinfo; - struct nf_nat_range newrange; - struct in6_addr newdst; - enum ip_conntrack_info ctinfo; - struct nf_conn *ct; - - ct = nf_ct_get(skb, &ctinfo); - if (par->hooknum == NF_INET_LOCAL_OUT) - newdst = loopback_addr; - else { - struct inet6_dev *idev; - struct inet6_ifaddr *ifa; - bool addr = false; - - rcu_read_lock(); - idev = __in6_dev_get(skb->dev); - if (idev != NULL) { - list_for_each_entry(ifa, &idev->addr_list, if_list) { - newdst = ifa->addr; - addr = true; - break; - } - } - rcu_read_unlock(); - - if (!addr) - return NF_DROP; - } - - newrange.flags = range->flags | NF_NAT_RANGE_MAP_IPS; - newrange.min_addr.in6 = newdst; - newrange.max_addr.in6 = newdst; - newrange.min_proto = range->min_proto; - newrange.max_proto = range->max_proto; - - return nf_nat_setup_info(ct, &newrange, NF_NAT_MANIP_DST); + return nf_nat_redirect_ipv6(skb, par->targinfo, par->hooknum); } static int redirect_tg6_checkentry(const struct xt_tgchk_param *par) -- cgit v1.2.3 From e9105f1bead4ec3f64904564c7c6268185d6b363 Mon Sep 17 00:00:00 2001 From: Arturo Borrero Date: Fri, 17 Oct 2014 12:39:09 +0200 Subject: netfilter: nf_tables: add new expression nft_redir This new expression provides NAT in the redirect flavour, which is to redirect packets to local machine. Signed-off-by: Arturo Borrero Gonzalez Signed-off-by: Pablo Neira Ayuso --- net/netfilter/Kconfig | 9 +++++ net/netfilter/Makefile | 1 + net/netfilter/nft_redir.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 108 insertions(+) create mode 100644 net/netfilter/nft_redir.c (limited to 'net/netfilter') diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 49deb4edbac6..373486ae4159 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -505,6 +505,15 @@ config NFT_MASQ This option adds the "masquerade" expression that you can use to perform NAT in the masquerade flavour. +config NFT_REDIR + depends on NF_TABLES + depends on NF_CONNTRACK + depends on NF_NAT + tristate "Netfilter nf_tables redirect support" + help + This options adds the "redirect" expression that you can use + to perform NAT in the redirect flavour. + config NFT_NAT depends on NF_TABLES depends on NF_CONNTRACK diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile index a9571be3f791..f3eb4680f2ec 100644 --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -88,6 +88,7 @@ obj-$(CONFIG_NFT_HASH) += nft_hash.o obj-$(CONFIG_NFT_COUNTER) += nft_counter.o obj-$(CONFIG_NFT_LOG) += nft_log.o obj-$(CONFIG_NFT_MASQ) += nft_masq.o +obj-$(CONFIG_NFT_REDIR) += nft_redir.o # generic X tables obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o diff --git a/net/netfilter/nft_redir.c b/net/netfilter/nft_redir.c new file mode 100644 index 000000000000..e27b4e35718a --- /dev/null +++ b/net/netfilter/nft_redir.c @@ -0,0 +1,98 @@ +/* + * Copyright (c) 2014 Arturo Borrero Gonzalez + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = { + [NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 }, + [NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 }, + [NFTA_REDIR_FLAGS] = { .type = NLA_U32 }, +}; +EXPORT_SYMBOL_GPL(nft_redir_policy); + +int nft_redir_init(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nlattr * const tb[]) +{ + struct nft_redir *priv = nft_expr_priv(expr); + u32 nla_be32; + int err; + + err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); + if (err < 0) + return err; + + if (tb[NFTA_REDIR_REG_PROTO_MIN]) { + nla_be32 = nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN]); + priv->sreg_proto_min = ntohl(nla_be32); + err = nft_validate_input_register(priv->sreg_proto_min); + if (err < 0) + return err; + + if (tb[NFTA_REDIR_REG_PROTO_MAX]) { + nla_be32 = nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX]); + priv->sreg_proto_max = ntohl(nla_be32); + err = nft_validate_input_register(priv->sreg_proto_max); + if (err < 0) + return err; + } else { + priv->sreg_proto_max = priv->sreg_proto_min; + } + } + + if (tb[NFTA_REDIR_FLAGS]) { + priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS])); + if (priv->flags & ~NF_NAT_RANGE_MASK) + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL_GPL(nft_redir_init); + +int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr) +{ + const struct nft_redir *priv = nft_expr_priv(expr); + + if (priv->sreg_proto_min) { + if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MIN, + htonl(priv->sreg_proto_min))) + goto nla_put_failure; + if (nla_put_be32(skb, NFTA_REDIR_REG_PROTO_MAX, + htonl(priv->sreg_proto_max))) + goto nla_put_failure; + } + + if (priv->flags != 0 && + nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags))) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -1; +} +EXPORT_SYMBOL_GPL(nft_redir_dump); + +int nft_redir_validate(const struct nft_ctx *ctx, const struct nft_expr *expr, + const struct nft_data **data) +{ + return nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); +} +EXPORT_SYMBOL_GPL(nft_redir_validate); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Arturo Borrero Gonzalez "); -- cgit v1.2.3 From d7701089118d23bfed03bad0a6b5cc5115990c9e Mon Sep 17 00:00:00 2001 From: Alex Gartrell Date: Mon, 6 Oct 2014 13:30:08 -0700 Subject: ipvs: remove unnecessary assignment in __ip_vs_get_out_rt It is a precondition of the function that daddr be equal to dest->addr.ip if dest is non-NULL, so this additional assignment is just confusing for stupid engineers like me. Signed-off-by: Alex Gartrell Signed-off-by: Simon Horman --- net/netfilter/ipvs/ip_vs_xmit.c | 1 - 1 file changed, 1 deletion(-) (limited to 'net/netfilter') diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c index 91f17c1eb8a2..5efa59792505 100644 --- a/net/netfilter/ipvs/ip_vs_xmit.c +++ b/net/netfilter/ipvs/ip_vs_xmit.c @@ -293,7 +293,6 @@ __ip_vs_get_out_rt(int skb_af, struct sk_buff *skb, struct ip_vs_dest *dest, &dest->addr.ip, &dest_dst->dst_saddr.ip, atomic_read(&rt->dst.__refcnt)); } - daddr = dest->addr.ip; if (ret_saddr) *ret_saddr = dest_dst->dst_saddr.ip; } else { -- cgit v1.2.3 From 0c26ed1c07f13ca27e2638ffdd1951013ed96c48 Mon Sep 17 00:00:00 2001 From: Marcelo Leitner Date: Wed, 29 Oct 2014 10:04:51 -0200 Subject: netfilter: nf_log: Introduce nft_log_dereference() macro Wrap up a common call pattern in an easier to handle call. Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_log.c | 21 +++++++++------------ 1 file changed, 9 insertions(+), 12 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index d7197649dba6..5eaf047ed37f 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -19,6 +19,9 @@ static struct nf_logger __rcu *loggers[NFPROTO_NUMPROTO][NF_LOG_TYPE_MAX] __read_mostly; static DEFINE_MUTEX(nf_log_mutex); +#define nft_log_dereference(logger) \ + rcu_dereference_protected(logger, lockdep_is_held(&nf_log_mutex)) + static struct nf_logger *__find_logger(int pf, const char *str_logger) { struct nf_logger *log; @@ -28,8 +31,7 @@ static struct nf_logger *__find_logger(int pf, const char *str_logger) if (loggers[pf][i] == NULL) continue; - log = rcu_dereference_protected(loggers[pf][i], - lockdep_is_held(&nf_log_mutex)); + log = nft_log_dereference(loggers[pf][i]); if (!strncasecmp(str_logger, log->name, strlen(log->name))) return log; } @@ -45,8 +47,7 @@ void nf_log_set(struct net *net, u_int8_t pf, const struct nf_logger *logger) return; mutex_lock(&nf_log_mutex); - log = rcu_dereference_protected(net->nf.nf_loggers[pf], - lockdep_is_held(&nf_log_mutex)); + log = nft_log_dereference(net->nf.nf_loggers[pf]); if (log == NULL) rcu_assign_pointer(net->nf.nf_loggers[pf], logger); @@ -61,8 +62,7 @@ void nf_log_unset(struct net *net, const struct nf_logger *logger) mutex_lock(&nf_log_mutex); for (i = 0; i < NFPROTO_NUMPROTO; i++) { - log = rcu_dereference_protected(net->nf.nf_loggers[i], - lockdep_is_held(&nf_log_mutex)); + log = nft_log_dereference(net->nf.nf_loggers[i]); if (log == logger) RCU_INIT_POINTER(net->nf.nf_loggers[i], NULL); } @@ -297,8 +297,7 @@ static int seq_show(struct seq_file *s, void *v) int i, ret; struct net *net = seq_file_net(s); - logger = rcu_dereference_protected(net->nf.nf_loggers[*pos], - lockdep_is_held(&nf_log_mutex)); + logger = nft_log_dereference(net->nf.nf_loggers[*pos]); if (!logger) ret = seq_printf(s, "%2lld NONE (", *pos); @@ -312,8 +311,7 @@ static int seq_show(struct seq_file *s, void *v) if (loggers[*pos][i] == NULL) continue; - logger = rcu_dereference_protected(loggers[*pos][i], - lockdep_is_held(&nf_log_mutex)); + logger = nft_log_dereference(loggers[*pos][i]); ret = seq_printf(s, "%s", logger->name); if (ret < 0) return ret; @@ -385,8 +383,7 @@ static int nf_log_proc_dostring(struct ctl_table *table, int write, mutex_unlock(&nf_log_mutex); } else { mutex_lock(&nf_log_mutex); - logger = rcu_dereference_protected(net->nf.nf_loggers[tindex], - lockdep_is_held(&nf_log_mutex)); + logger = nft_log_dereference(net->nf.nf_loggers[tindex]); if (!logger) table->data = "NONE"; else -- cgit v1.2.3 From 8ac2bde2a4a05c38e2bd733bea94507cb1461e06 Mon Sep 17 00:00:00 2001 From: Marcelo Leitner Date: Wed, 29 Oct 2014 10:51:13 -0200 Subject: netfilter: log: protect nf_log_register against double registering Currently, despite the comment right before the function, nf_log_register allows registering two loggers on with the same type and end up overwriting the previous register. Not a real issue today as current tree doesn't have two loggers for the same type but it's better to get this protected. Also make sure that all of its callers do error checking. Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_log.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index 5eaf047ed37f..9562e393fdf7 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -75,6 +75,7 @@ EXPORT_SYMBOL(nf_log_unset); int nf_log_register(u_int8_t pf, struct nf_logger *logger) { int i; + int ret = 0; if (pf >= ARRAY_SIZE(init_net.nf.nf_loggers)) return -EINVAL; @@ -82,16 +83,25 @@ int nf_log_register(u_int8_t pf, struct nf_logger *logger) mutex_lock(&nf_log_mutex); if (pf == NFPROTO_UNSPEC) { + for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) { + if (rcu_access_pointer(loggers[i][logger->type])) { + ret = -EEXIST; + goto unlock; + } + } for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++) rcu_assign_pointer(loggers[i][logger->type], logger); } else { - /* register at end of list to honor first register win */ + if (rcu_access_pointer(loggers[pf][logger->type])) { + ret = -EEXIST; + goto unlock; + } rcu_assign_pointer(loggers[pf][logger->type], logger); } +unlock: mutex_unlock(&nf_log_mutex); - - return 0; + return ret; } EXPORT_SYMBOL(nf_log_register); -- cgit v1.2.3 From 01cfa0a4ed82132abb6dc7bcb126eaf499cb8af0 Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Wed, 29 Oct 2014 22:57:19 -0700 Subject: netfilter: fix spelling errors Signed-off-by: Stephen Hemminger Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_helper.c | 2 +- net/netfilter/nf_tables_api.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c index 5b3eae7d4c9a..bd9d31537905 100644 --- a/net/netfilter/nf_conntrack_helper.c +++ b/net/netfilter/nf_conntrack_helper.c @@ -250,7 +250,7 @@ out: } EXPORT_SYMBOL_GPL(__nf_ct_try_assign_helper); -/* appropiate ct lock protecting must be taken by caller */ +/* appropriate ct lock protecting must be taken by caller */ static inline int unhelp(struct nf_conntrack_tuple_hash *i, const struct nf_conntrack_helper *me) { diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 65eb2a1160d5..1ffb253c6a77 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -2477,7 +2477,7 @@ static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb, const struct nfgenmsg *nfmsg = nlmsg_data(nlh); int err; - /* Verify existance before starting dump */ + /* Verify existence before starting dump */ err = nft_ctx_init_from_setattr(&ctx, skb, nlh, nla); if (err < 0) return err; -- cgit v1.2.3 From c5a589cc3034d035e8490216a45abd3a3b3cd85e Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Thu, 30 Oct 2014 18:39:12 +0100 Subject: netfilter: nf_log: fix sparse warning in nf_logger_find_get() net/netfilter/nf_log.c:157:16: warning: incorrect type in assignment (different address spaces) net/netfilter/nf_log.c:157:16: expected struct nf_logger *logger net/netfilter/nf_log.c:157:16: got struct nf_logger [noderef] * Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_log.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c index 9562e393fdf7..49a64174f3f1 100644 --- a/net/netfilter/nf_log.c +++ b/net/netfilter/nf_log.c @@ -154,8 +154,7 @@ int nf_logger_find_get(int pf, enum nf_log_type type) struct nf_logger *logger; int ret = -ENOENT; - logger = loggers[pf][type]; - if (logger == NULL) + if (rcu_access_pointer(loggers[pf][type]) == NULL) request_module("nf-logger-%u-%u", pf, type); rcu_read_lock(); -- cgit v1.2.3 From ce674173e9f4ef7fd0dc04ea0773cdedfbf8e366 Mon Sep 17 00:00:00 2001 From: Ana Rey Date: Mon, 3 Nov 2014 18:10:50 +0100 Subject: netfilter: nft_meta: add cgroup support This allows you to filter traffic by process control group (cgroup). Signed-off-by: Ana Rey Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_meta.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'net/netfilter') diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c index 1e7c076ca63a..e99911eda915 100644 --- a/net/netfilter/nft_meta.c +++ b/net/netfilter/nft_meta.c @@ -165,6 +165,12 @@ void nft_meta_get_eval(const struct nft_expr *expr, goto err; dest->data[0] = out->group; break; + case NFT_META_CGROUP: + if (skb->sk == NULL) + break; + + dest->data[0] = skb->sk->sk_classid; + break; default: WARN_ON(1); goto err; @@ -240,6 +246,7 @@ int nft_meta_get_init(const struct nft_ctx *ctx, case NFT_META_CPU: case NFT_META_IIFGROUP: case NFT_META_OIFGROUP: + case NFT_META_CGROUP: break; default: return -EOPNOTSUPP; -- cgit v1.2.3 From f6c6339d5e945975066cb452c78a7cbe89413f37 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Wed, 12 Nov 2014 11:50:16 +0100 Subject: netfilter: fix unmet dependencies in NETFILTER_XT_TARGET_REDIRECT warning: (NETFILTER_XT_TARGET_REDIRECT) selects NF_NAT_REDIRECT_IPV4 which has unmet direct dependencies (NET && INET && NETFILTER && NF_NAT_IPV4) warning: (NETFILTER_XT_TARGET_REDIRECT) selects NF_NAT_REDIRECT_IPV6 which has unmet direct dependencies (NET && INET && IPV6 && NETFILTER && NF_NAT_IPV6) Fixes: 8b13edd ("netfilter: refactor NAT redirect IPv4 to use it from nf_tables") Fixes: 9de920e ("netfilter: refactor NAT redirect IPv6 code to use it from nf_tables") Reported-by: kbuild test robot Signed-off-by: Pablo Neira Ayuso --- net/netfilter/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig index 373486ae4159..57f15a9aa481 100644 --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -844,8 +844,8 @@ config NETFILTER_XT_TARGET_RATEEST config NETFILTER_XT_TARGET_REDIRECT tristate "REDIRECT target support" depends on NF_NAT - select NF_NAT_REDIRECT_IPV4 - select NF_NAT_REDIRECT_IPV6 if IP6_NF_IPTABLES + select NF_NAT_REDIRECT_IPV4 if NF_NAT_IPV4 + select NF_NAT_REDIRECT_IPV6 if NF_NAT_IPV6 ---help--- REDIRECT is a special case of NAT: all incoming connections are mapped onto the incoming interface's address, causing the packets to -- cgit v1.2.3 From baf4750d92cdfb63d6535f7166c6189d07407b65 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Wed, 12 Nov 2014 11:56:47 +0100 Subject: netfilter: nft_redir: fix sparse warnings >> net/netfilter/nft_redir.c:39:26: sparse: incorrect type in assignment (different base types) net/netfilter/nft_redir.c:39:26: expected unsigned int [unsigned] [usertype] nla_be32 net/netfilter/nft_redir.c:39:26: got restricted __be32 >> net/netfilter/nft_redir.c:40:40: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:40:40: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:40:40: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:40:40: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:40:40: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:40:40: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:46:34: sparse: incorrect type in assignment (different base types) net/netfilter/nft_redir.c:46:34: expected unsigned int [unsigned] [usertype] nla_be32 net/netfilter/nft_redir.c:46:34: got restricted __be32 >> net/netfilter/nft_redir.c:47:48: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:47:48: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:47:48: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:47:48: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:47:48: sparse: cast to restricted __be32 >> net/netfilter/nft_redir.c:47:48: sparse: cast to restricted __be32 Fixes: e9105f1 ("netfilter: nf_tables: add new expression nft_redir") Reported-by: kbuild test robot Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nft_redir.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nft_redir.c b/net/netfilter/nft_redir.c index e27b4e35718a..9e8093f28311 100644 --- a/net/netfilter/nft_redir.c +++ b/net/netfilter/nft_redir.c @@ -28,7 +28,6 @@ int nft_redir_init(const struct nft_ctx *ctx, const struct nlattr * const tb[]) { struct nft_redir *priv = nft_expr_priv(expr); - u32 nla_be32; int err; err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT); @@ -36,15 +35,17 @@ int nft_redir_init(const struct nft_ctx *ctx, return err; if (tb[NFTA_REDIR_REG_PROTO_MIN]) { - nla_be32 = nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN]); - priv->sreg_proto_min = ntohl(nla_be32); + priv->sreg_proto_min = + ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN])); + err = nft_validate_input_register(priv->sreg_proto_min); if (err < 0) return err; if (tb[NFTA_REDIR_REG_PROTO_MAX]) { - nla_be32 = nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX]); - priv->sreg_proto_max = ntohl(nla_be32); + priv->sreg_proto_max = + ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX])); + err = nft_validate_input_register(priv->sreg_proto_max); if (err < 0) return err; -- cgit v1.2.3 From 56768644317c7746cb63f61573fcdc2355885707 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Thu, 13 Nov 2014 10:04:16 +0100 Subject: netfilter: fix various sparse warnings net/bridge/br_netfilter.c:870:6: symbol 'br_netfilter_enable' was not declared. Should it be static? no; add include net/ipv4/netfilter/nft_reject_ipv4.c:22:6: symbol 'nft_reject_ipv4_eval' was not declared. Should it be static? yes net/ipv6/netfilter/nf_reject_ipv6.c:16:6: symbol 'nf_send_reset6' was not declared. Should it be static? no; add include net/ipv6/netfilter/nft_reject_ipv6.c:22:6: symbol 'nft_reject_ipv6_eval' was not declared. Should it be static? yes net/netfilter/core.c:33:32: symbol 'nf_ipv6_ops' was not declared. Should it be static? no; add include net/netfilter/xt_DSCP.c:40:57: cast truncates bits from constant value (ffffff03 becomes 3) net/netfilter/xt_DSCP.c:57:59: cast truncates bits from constant value (ffffff03 becomes 3) add __force, 3 is what we want. net/ipv4/netfilter/nf_log_arp.c:77:6: symbol 'nf_log_arp_packet' was not declared. Should it be static? yes net/ipv4/netfilter/nf_reject_ipv4.c:17:6: symbol 'nf_send_reset' was not declared. Should it be static? no; add include Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/core.c | 1 + net/netfilter/xt_DSCP.c | 6 ++++-- 2 files changed, 5 insertions(+), 2 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/core.c b/net/netfilter/core.c index 024a2e25c8a4..fea9ef566427 100644 --- a/net/netfilter/core.c +++ b/net/netfilter/core.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include diff --git a/net/netfilter/xt_DSCP.c b/net/netfilter/xt_DSCP.c index ae8271652efa..3f83d38c4e5b 100644 --- a/net/netfilter/xt_DSCP.c +++ b/net/netfilter/xt_DSCP.c @@ -37,7 +37,8 @@ dscp_tg(struct sk_buff *skb, const struct xt_action_param *par) if (!skb_make_writable(skb, sizeof(struct iphdr))) return NF_DROP; - ipv4_change_dsfield(ip_hdr(skb), (__u8)(~XT_DSCP_MASK), + ipv4_change_dsfield(ip_hdr(skb), + (__force __u8)(~XT_DSCP_MASK), dinfo->dscp << XT_DSCP_SHIFT); } @@ -54,7 +55,8 @@ dscp_tg6(struct sk_buff *skb, const struct xt_action_param *par) if (!skb_make_writable(skb, sizeof(struct ipv6hdr))) return NF_DROP; - ipv6_change_dsfield(ipv6_hdr(skb), (__u8)(~XT_DSCP_MASK), + ipv6_change_dsfield(ipv6_hdr(skb), + (__force __u8)(~XT_DSCP_MASK), dinfo->dscp << XT_DSCP_SHIFT); } return XT_CONTINUE; -- cgit v1.2.3 From 8225161545a67bdb68cf86beafcdce1604720605 Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Thu, 6 Nov 2014 12:32:28 +0100 Subject: netfilter: nfnetlink_log: remove unnecessary error messages In case of OOM, there's nothing userspace can do. If there's no room to put the payload in __build_packet_message(), jump to nla_put_failure which already performs the corresponding error reporting. Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nfnetlink_log.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index b1e3a0579416..51996ece3d2a 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -334,9 +334,6 @@ nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size, skb = nfnetlink_alloc_skb(net, pkt_size, peer_portid, GFP_ATOMIC); - if (!skb) - pr_err("nfnetlink_log: can't even alloc %u bytes\n", - pkt_size); } } @@ -568,10 +565,8 @@ __build_packet_message(struct nfnl_log_net *log, struct nlattr *nla; int size = nla_attr_size(data_len); - if (skb_tailroom(inst->skb) < nla_total_size(data_len)) { - printk(KERN_WARNING "nfnetlink_log: no tailroom!\n"); - return -1; - } + if (skb_tailroom(inst->skb) < nla_total_size(data_len)) + goto nla_put_failure; nla = (struct nlattr *)skb_put(inst->skb, nla_total_size(data_len)); nla->nla_type = NFULA_PAYLOAD; -- cgit v1.2.3 From e59ea3df3fc290b91c52a250c19091c18b4e6d7e Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Fri, 14 Nov 2014 13:21:48 +0100 Subject: netfilter: xt_connlimit: honor conntrack zone if available Currently all the conntrack lookups are done using default zone. In case the skb has a ct attached (e.g. template) we should use this zone for lookups instead. This makes connlimit work with connections assigned to other zones. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/xt_connlimit.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/xt_connlimit.c b/net/netfilter/xt_connlimit.c index fbc66bb250d5..29ba6218a820 100644 --- a/net/netfilter/xt_connlimit.c +++ b/net/netfilter/xt_connlimit.c @@ -134,6 +134,7 @@ static bool add_hlist(struct hlist_head *head, static unsigned int check_hlist(struct net *net, struct hlist_head *head, const struct nf_conntrack_tuple *tuple, + u16 zone, bool *addit) { const struct nf_conntrack_tuple_hash *found; @@ -147,8 +148,7 @@ static unsigned int check_hlist(struct net *net, /* check the saved connections */ hlist_for_each_entry_safe(conn, n, head, node) { - found = nf_conntrack_find_get(net, NF_CT_DEFAULT_ZONE, - &conn->tuple); + found = nf_conntrack_find_get(net, zone, &conn->tuple); if (found == NULL) { hlist_del(&conn->node); kmem_cache_free(connlimit_conn_cachep, conn); @@ -201,7 +201,7 @@ static unsigned int count_tree(struct net *net, struct rb_root *root, const struct nf_conntrack_tuple *tuple, const union nf_inet_addr *addr, const union nf_inet_addr *mask, - u8 family) + u8 family, u16 zone) { struct xt_connlimit_rb *gc_nodes[CONNLIMIT_GC_MAX_NODES]; struct rb_node **rbnode, *parent; @@ -229,7 +229,7 @@ count_tree(struct net *net, struct rb_root *root, } else { /* same source network -> be counted! */ unsigned int count; - count = check_hlist(net, &rbconn->hhead, tuple, &addit); + count = check_hlist(net, &rbconn->hhead, tuple, zone, &addit); tree_nodes_free(root, gc_nodes, gc_count); if (!addit) @@ -245,7 +245,7 @@ count_tree(struct net *net, struct rb_root *root, continue; /* only used for GC on hhead, retval and 'addit' ignored */ - check_hlist(net, &rbconn->hhead, tuple, &addit); + check_hlist(net, &rbconn->hhead, tuple, zone, &addit); if (hlist_empty(&rbconn->hhead)) gc_nodes[gc_count++] = rbconn; } @@ -290,7 +290,7 @@ static int count_them(struct net *net, const struct nf_conntrack_tuple *tuple, const union nf_inet_addr *addr, const union nf_inet_addr *mask, - u_int8_t family) + u_int8_t family, u16 zone) { struct rb_root *root; int count; @@ -306,7 +306,7 @@ static int count_them(struct net *net, spin_lock_bh(&xt_connlimit_locks[hash % CONNLIMIT_LOCK_SLOTS]); - count = count_tree(net, root, tuple, addr, mask, family); + count = count_tree(net, root, tuple, addr, mask, family, zone); spin_unlock_bh(&xt_connlimit_locks[hash % CONNLIMIT_LOCK_SLOTS]); @@ -324,13 +324,16 @@ connlimit_mt(const struct sk_buff *skb, struct xt_action_param *par) enum ip_conntrack_info ctinfo; const struct nf_conn *ct; unsigned int connections; + u16 zone = NF_CT_DEFAULT_ZONE; ct = nf_ct_get(skb, &ctinfo); - if (ct != NULL) + if (ct != NULL) { tuple_ptr = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple; - else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), - par->family, &tuple)) + zone = nf_ct_zone(ct); + } else if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), + par->family, &tuple)) { goto hotdrop; + } if (par->family == NFPROTO_IPV6) { const struct ipv6hdr *iph = ipv6_hdr(skb); @@ -343,7 +346,7 @@ connlimit_mt(const struct sk_buff *skb, struct xt_action_param *par) } connections = count_them(net, info->data, tuple_ptr, &addr, - &info->mask, par->family); + &info->mask, par->family, zone); if (connections == 0) /* kmalloc failed, drop it entirely */ goto hotdrop; -- cgit v1.2.3 From 2c7b5d5dac0ddaa4e1109fb84dbbe91db3c6c6e5 Mon Sep 17 00:00:00 2001 From: Vasily Averin Date: Thu, 13 Nov 2014 14:31:25 +0300 Subject: netfilter: nf_conntrack_h323: lookup route from proper net namespace Signed-off-by: Vasily Averin Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_h323_main.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c index 3a3a60b126e0..1d69f5b9748f 100644 --- a/net/netfilter/nf_conntrack_h323_main.c +++ b/net/netfilter/nf_conntrack_h323_main.c @@ -728,7 +728,8 @@ static int expect_h245(struct sk_buff *skb, struct nf_conn *ct, /* If the calling party is on the same side of the forward-to party, * we don't need to track the second call */ -static int callforward_do_filter(const union nf_inet_addr *src, +static int callforward_do_filter(struct net *net, + const union nf_inet_addr *src, const union nf_inet_addr *dst, u_int8_t family) { @@ -750,9 +751,9 @@ static int callforward_do_filter(const union nf_inet_addr *src, memset(&fl2, 0, sizeof(fl2)); fl2.daddr = dst->ip; - if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, + if (!afinfo->route(net, (struct dst_entry **)&rt1, flowi4_to_flowi(&fl1), false)) { - if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, + if (!afinfo->route(net, (struct dst_entry **)&rt2, flowi4_to_flowi(&fl2), false)) { if (rt_nexthop(rt1, fl1.daddr) == rt_nexthop(rt2, fl2.daddr) && @@ -774,9 +775,9 @@ static int callforward_do_filter(const union nf_inet_addr *src, memset(&fl2, 0, sizeof(fl2)); fl2.daddr = dst->in6; - if (!afinfo->route(&init_net, (struct dst_entry **)&rt1, + if (!afinfo->route(net, (struct dst_entry **)&rt1, flowi6_to_flowi(&fl1), false)) { - if (!afinfo->route(&init_net, (struct dst_entry **)&rt2, + if (!afinfo->route(net, (struct dst_entry **)&rt2, flowi6_to_flowi(&fl2), false)) { if (ipv6_addr_equal(rt6_nexthop(rt1), rt6_nexthop(rt2)) && @@ -807,6 +808,7 @@ static int expect_callforwarding(struct sk_buff *skb, __be16 port; union nf_inet_addr addr; struct nf_conntrack_expect *exp; + struct net *net = nf_ct_net(ct); typeof(nat_callforwarding_hook) nat_callforwarding; /* Read alternativeAddress */ @@ -816,7 +818,7 @@ static int expect_callforwarding(struct sk_buff *skb, /* If the calling party is on the same side of the forward-to party, * we don't need to track the second call */ if (callforward_filter && - callforward_do_filter(&addr, &ct->tuplehash[!dir].tuple.src.u3, + callforward_do_filter(net, &addr, &ct->tuplehash[!dir].tuple.src.u3, nf_ct_l3num(ct))) { pr_debug("nf_ct_q931: Call Forwarding not tracked\n"); return 0; -- cgit v1.2.3 From 982f405136a44754e884184d24b70d2d4cefcb7a Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Tue, 18 Nov 2014 20:37:05 +0100 Subject: netfilter: Deletion of unnecessary checks before two function calls The functions free_percpu() and module_put() test whether their argument is NULL and then return immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring Acked-by: Julian Anastasov Acked-by: Simon Horman Signed-off-by: Pablo Neira Ayuso --- net/netfilter/ipvs/ip_vs_ctl.c | 3 +-- net/netfilter/ipvs/ip_vs_pe.c | 3 +-- net/netfilter/ipvs/ip_vs_sched.c | 3 +-- net/netfilter/ipvs/ip_vs_sync.c | 3 +-- net/netfilter/nf_tables_api.c | 3 +-- 5 files changed, 5 insertions(+), 10 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c index ac7ba689efe7..b8295a430a56 100644 --- a/net/netfilter/ipvs/ip_vs_ctl.c +++ b/net/netfilter/ipvs/ip_vs_ctl.c @@ -465,8 +465,7 @@ __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc) static void ip_vs_service_free(struct ip_vs_service *svc) { - if (svc->stats.cpustats) - free_percpu(svc->stats.cpustats); + free_percpu(svc->stats.cpustats); kfree(svc); } diff --git a/net/netfilter/ipvs/ip_vs_pe.c b/net/netfilter/ipvs/ip_vs_pe.c index 1a82b29ce8ea..0df17caa8af6 100644 --- a/net/netfilter/ipvs/ip_vs_pe.c +++ b/net/netfilter/ipvs/ip_vs_pe.c @@ -37,8 +37,7 @@ struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name) rcu_read_unlock(); return pe; } - if (pe->module) - module_put(pe->module); + module_put(pe->module); } rcu_read_unlock(); diff --git a/net/netfilter/ipvs/ip_vs_sched.c b/net/netfilter/ipvs/ip_vs_sched.c index 4dbcda6258bc..199760c71f39 100644 --- a/net/netfilter/ipvs/ip_vs_sched.c +++ b/net/netfilter/ipvs/ip_vs_sched.c @@ -104,8 +104,7 @@ static struct ip_vs_scheduler *ip_vs_sched_getbyname(const char *sched_name) mutex_unlock(&ip_vs_sched_mutex); return sched; } - if (sched->module) - module_put(sched->module); + module_put(sched->module); } mutex_unlock(&ip_vs_sched_mutex); diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c index 7162c86fd50d..c47ffd7a0a70 100644 --- a/net/netfilter/ipvs/ip_vs_sync.c +++ b/net/netfilter/ipvs/ip_vs_sync.c @@ -820,8 +820,7 @@ ip_vs_conn_fill_param_sync(struct net *net, int af, union ip_vs_sync_conn *sc, p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC); if (!p->pe_data) { - if (p->pe->module) - module_put(p->pe->module); + module_put(p->pe->module); return -ENOMEM; } p->pe_data_len = pe_data_len; diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 1ffb253c6a77..18a9daef22dd 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3674,8 +3674,7 @@ static int nf_tables_abort(struct sk_buff *skb) break; case NFT_MSG_NEWCHAIN: if (nft_trans_chain_update(trans)) { - if (nft_trans_chain_stats(trans)) - free_percpu(nft_trans_chain_stats(trans)); + free_percpu(nft_trans_chain_stats(trans)); nft_trans_destroy(trans); } else { -- cgit v1.2.3 From beacd3e8ef237e077c8707395440813feef16d3f Mon Sep 17 00:00:00 2001 From: Marcelo Leitner Date: Thu, 6 Nov 2014 12:32:30 +0100 Subject: netfilter: nfnetlink_log: Make use of pr_fmt where applicable Signed-off-by: Marcelo Ricardo Leitner Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nfnetlink_log.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c index 51996ece3d2a..405cf5879320 100644 --- a/net/netfilter/nfnetlink_log.c +++ b/net/netfilter/nfnetlink_log.c @@ -12,6 +12,9 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include #include #include @@ -1063,19 +1066,19 @@ static int __init nfnetlink_log_init(void) netlink_register_notifier(&nfulnl_rtnl_notifier); status = nfnetlink_subsys_register(&nfulnl_subsys); if (status < 0) { - pr_err("log: failed to create netlink socket\n"); + pr_err("failed to create netlink socket\n"); goto cleanup_netlink_notifier; } status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger); if (status < 0) { - pr_err("log: failed to register logger\n"); + pr_err("failed to register logger\n"); goto cleanup_subsys; } status = register_pernet_subsys(&nfnl_log_net_ops); if (status < 0) { - pr_err("log: failed to register pernet ops\n"); + pr_err("failed to register pernet ops\n"); goto cleanup_logger; } return status; -- cgit v1.2.3