Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf

Pablo Neira Ayuso says:

====================
The following patchset contains three Netfilter fixes and update
for the MAINTAINER file for your net tree, they are:

* Fix crash if nf_log_packet is called from conntrack, in that case
  both interfaces are NULL, from Hans Schillstrom. This bug introduced
  with the logging netns support in the previous merge window.

* Fix compilation of nf_log and nf_queue without CONFIG_PROC_FS,
  from myself. This bug was introduced in the previous merge window
  with the new netns support for the netfilter logging infrastructure.

* Fix possible crash in xt_TCPOPTSTRIP due to missing sanity
  checkings to validate that the TCP header is well-formed, from
  myself. I can find this bug in 2.6.25, probably it's been there
  since the beginning. I'll pass this to -stable.

* Update MAINTAINER file to point to new nf trees at git.kernel.org,
  remove Harald and use M: instead of P: (now obsolete tag) to
  keep Jozsef in the list of people.

Please, consider pulling this. Thanks!
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 67 insertions, 39 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 3d7782b9f90d..50955f90ed7e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5509,18 +5509,18 @@ F:	Documentation/networking/s2io.txt
 F:      Documentation/networking/vxge.txt
 F:      drivers/net/ethernet/neterion/
 
-NETFILTER/IPTABLES/IPCHAINS
-P:      Harald Welte
-P:      Jozsef Kadlecsik
+NETFILTER/IPTABLES
 M:      Pablo Neira Ayuso <pablo@netfilter.org>
 M:      Patrick McHardy <kaber@trash.net>
+M:      Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 L:      netfilter-devel@vger.kernel.org
 L:      netfilter@vger.kernel.org
 L:      coreteam@netfilter.org
 W:      http://www.netfilter.org/
 W:      http://www.iptables.org/
-T:      git git://1984.lsi.us.es/nf
-T:      git git://1984.lsi.us.es/nf-next
+Q:      http://patchwork.ozlabs.org/project/netfilter-devel/list/
+T:      git git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf.git
+T:      git git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git
 S:      Supported
 F:      include/linux/netfilter*
 F:      include/linux/netfilter/
diff --git a/include/net/netfilter/nf_log.h b/include/net/netfilter/nf_log.h
index 31f1fb9eb784..99eac12d040b 100644
--- a/include/net/netfilter/nf_log.h
+++ b/include/net/netfilter/nf_log.h
@@ -30,7 +30,8 @@ struct nf_loginfo {
         } u;
 };
 
-typedef void nf_logfn(u_int8_t pf,
+typedef void nf_logfn(struct net *net,
+                      u_int8_t pf,
                       unsigned int hooknum,
                       const struct sk_buff *skb,
                       const struct net_device *in,
diff --git a/include/net/netfilter/nfnetlink_log.h b/include/net/netfilter/nfnetlink_log.h
index e2dec42c2db2..5ca3f14f0998 100644
--- a/include/net/netfilter/nfnetlink_log.h
+++ b/include/net/netfilter/nfnetlink_log.h
@@ -2,7 +2,8 @@
 #define _KER_NFNETLINK_LOG_H
 
 void
-nfulnl_log_packet(u_int8_t pf,
+nfulnl_log_packet(struct net *net,
+                  u_int8_t pf,
                   unsigned int hooknum,
                   const struct sk_buff *skb,
                   const struct net_device *in,
diff --git a/net/bridge/netfilter/ebt_log.c b/net/bridge/netfilter/ebt_log.c
index 9878eb8204c5..19c37a4929bc 100644
--- a/net/bridge/netfilter/ebt_log.c
+++ b/net/bridge/netfilter/ebt_log.c
@@ -72,13 +72,12 @@ print_ports(const struct sk_buff *skb, uint8_t protocol, int offset)
 }
 
 static void
-ebt_log_packet(u_int8_t pf, unsigned int hooknum,
-   const struct sk_buff *skb, const struct net_device *in,
-   const struct net_device *out, const struct nf_loginfo *loginfo,
-   const char *prefix)
+ebt_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum,
+               const struct sk_buff *skb, const struct net_device *in,
+               const struct net_device *out, const struct nf_loginfo *loginfo,
+               const char *prefix)
 {
         unsigned int bitmask;
-        struct net *net = dev_net(in ? in : out);
 
         /* FIXME: Disabled from containers until syslog ns is supported */
         if (!net_eq(net, &init_net))
@@ -191,7 +190,7 @@ ebt_log_tg(struct sk_buff *skb, const struct xt_action_param *par)
                 nf_log_packet(net, NFPROTO_BRIDGE, par->hooknum, skb,
                               par->in, par->out, &li, "%s", info->prefix);
         else
-                ebt_log_packet(NFPROTO_BRIDGE, par->hooknum, skb, par->in,
+                ebt_log_packet(net, NFPROTO_BRIDGE, par->hooknum, skb, par->in,
                                par->out, &li, info->prefix);
         return EBT_CONTINUE;
 }
diff --git a/net/bridge/netfilter/ebt_ulog.c b/net/bridge/netfilter/ebt_ulog.c
index fc1905c51417..df0364aa12d5 100644
--- a/net/bridge/netfilter/ebt_ulog.c
+++ b/net/bridge/netfilter/ebt_ulog.c
@@ -131,14 +131,16 @@ static struct sk_buff *ulog_alloc_skb(unsigned int size)
         return skb;
 }
 
-static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
-   const struct net_device *in, const struct net_device *out,
-   const struct ebt_ulog_info *uloginfo, const char *prefix)
+static void ebt_ulog_packet(struct net *net, unsigned int hooknr,
+                            const struct sk_buff *skb,
+                            const struct net_device *in,
+                            const struct net_device *out,
+                            const struct ebt_ulog_info *uloginfo,
+                            const char *prefix)
 {
         ebt_ulog_packet_msg_t *pm;
         size_t size, copy_len;
         struct nlmsghdr *nlh;
-        struct net *net = dev_net(in ? in : out);
         struct ebt_ulog_net *ebt = ebt_ulog_pernet(net);
         unsigned int group = uloginfo->nlgroup;
         ebt_ulog_buff_t *ub = &ebt->ulog_buffers[group];
@@ -233,7 +235,7 @@ unlock:
 }
 
 /* this function is registered with the netfilter core */
-static void ebt_log_packet(u_int8_t pf, unsigned int hooknum,
+static void ebt_log_packet(struct net *net, u_int8_t pf, unsigned int hooknum,
    const struct sk_buff *skb, const struct net_device *in,
    const struct net_device *out, const struct nf_loginfo *li,
    const char *prefix)
@@ -252,13 +254,15 @@ static void ebt_log_packet(u_int8_t pf, unsigned int hooknum,
                 strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
         }
 
-        ebt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
+        ebt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
 }
 
 static unsigned int
 ebt_ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
-        ebt_ulog_packet(par->hooknum, skb, par->in, par->out,
+        struct net *net = dev_net(par->in ? par->in : par->out);
+
+        ebt_ulog_packet(net, par->hooknum, skb, par->in, par->out,
                         par->targinfo, NULL);
         return EBT_CONTINUE;
 }
diff --git a/net/ipv4/netfilter/ipt_ULOG.c b/net/ipv4/netfilter/ipt_ULOG.c
index f8a222cb6448..cf08218ddbcf 100644
--- a/net/ipv4/netfilter/ipt_ULOG.c
+++ b/net/ipv4/netfilter/ipt_ULOG.c
@@ -162,7 +162,8 @@ static struct sk_buff *ulog_alloc_skb(unsigned int size)
         return skb;
 }
 
-static void ipt_ulog_packet(unsigned int hooknum,
+static void ipt_ulog_packet(struct net *net,
+                            unsigned int hooknum,
                             const struct sk_buff *skb,
                             const struct net_device *in,
                             const struct net_device *out,
@@ -174,7 +175,6 @@ static void ipt_ulog_packet(unsigned int hooknum,
         size_t size, copy_len;
         struct nlmsghdr *nlh;
         struct timeval tv;
-        struct net *net = dev_net(in ? in : out);
         struct ulog_net *ulog = ulog_pernet(net);
 
         /* ffs == find first bit set, necessary because userspace
@@ -291,12 +291,15 @@ alloc_failure:
 static unsigned int
 ulog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
-        ipt_ulog_packet(par->hooknum, skb, par->in, par->out,
+        struct net *net = dev_net(par->in ? par->in : par->out);
+
+        ipt_ulog_packet(net, par->hooknum, skb, par->in, par->out,
                         par->targinfo, NULL);
         return XT_CONTINUE;
 }
 
-static void ipt_logfn(u_int8_t pf,
+static void ipt_logfn(struct net *net,
+                      u_int8_t pf,
                       unsigned int hooknum,
                       const struct sk_buff *skb,
                       const struct net_device *in,
@@ -318,7 +321,7 @@ static void ipt_logfn(u_int8_t pf,
                 strlcpy(loginfo.prefix, prefix, sizeof(loginfo.prefix));
         }
 
-        ipt_ulog_packet(hooknum, skb, in, out, &loginfo, prefix);
+        ipt_ulog_packet(net, hooknum, skb, in, out, &loginfo, prefix);
 }
 
 static int ulog_tg_check(const struct xt_tgchk_param *par)
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 388656d5a9ec..3b18dd1be7d9 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -148,7 +148,7 @@ void nf_log_packet(struct net *net,
                 va_start(args, fmt);
                 vsnprintf(prefix, sizeof(prefix), fmt, args);
                 va_end(args);
-                logger->logfn(pf, hooknum, skb, in, out, loginfo, prefix);
+                logger->logfn(net, pf, hooknum, skb, in, out, loginfo, prefix);
         }
         rcu_read_unlock();
 }
@@ -368,17 +368,20 @@ static int __net_init nf_log_net_init(struct net *net)
         return 0;
 
 out_sysctl:
+#ifdef CONFIG_PROC_FS
         /* For init_net: errors will trigger panic, don't unroll on error. */
         if (!net_eq(net, &init_net))
                 remove_proc_entry("nf_log", net->nf.proc_netfilter);
-
+#endif
         return ret;
 }
 
 static void __net_exit nf_log_net_exit(struct net *net)
 {
         netfilter_log_sysctl_exit(net);
+#ifdef CONFIG_PROC_FS
         remove_proc_entry("nf_log", net->nf.proc_netfilter);
+#endif
 }
 
 static struct pernet_operations nf_log_net_ops = {
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index faf1e9300d8a..962e9792e317 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -602,7 +602,8 @@ static struct nf_loginfo default_loginfo = {
 
 /* log handler for internal netfilter logging api */
 void
-nfulnl_log_packet(u_int8_t pf,
+nfulnl_log_packet(struct net *net,
+                  u_int8_t pf,
                   unsigned int hooknum,
                   const struct sk_buff *skb,
                   const struct net_device *in,
@@ -615,7 +616,6 @@ nfulnl_log_packet(u_int8_t pf,
         const struct nf_loginfo *li;
         unsigned int qthreshold;
         unsigned int plen;
-        struct net *net = dev_net(in ? in : out);
         struct nfnl_log_net *log = nfnl_log_pernet(net);
 
         if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
@@ -1045,7 +1045,9 @@ static int __net_init nfnl_log_net_init(struct net *net)
 
 static void __net_exit nfnl_log_net_exit(struct net *net)
 {
+#ifdef CONFIG_PROC_FS
         remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
+#endif
 }
 
 static struct pernet_operations nfnl_log_net_ops = {
diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index 2e0e835baf72..4e27fa035814 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -1285,7 +1285,9 @@ static int __net_init nfnl_queue_net_init(struct net *net)
 
 static void __net_exit nfnl_queue_net_exit(struct net *net)
 {
+#ifdef CONFIG_PROC_FS
         remove_proc_entry("nfnetlink_queue", net->nf.proc_netfilter);
+#endif
 }
 
 static struct pernet_operations nfnl_queue_net_ops = {
diff --git a/net/netfilter/xt_LOG.c b/net/netfilter/xt_LOG.c
index fe573f6c9e91..491c7d821a0b 100644
--- a/net/netfilter/xt_LOG.c
+++ b/net/netfilter/xt_LOG.c
@@ -466,7 +466,8 @@ log_packet_common(struct sbuff *m,
 
 
 static void
-ipt_log_packet(u_int8_t pf,
+ipt_log_packet(struct net *net,
+               u_int8_t pf,
                unsigned int hooknum,
                const struct sk_buff *skb,
                const struct net_device *in,
@@ -475,7 +476,6 @@ ipt_log_packet(u_int8_t pf,
                const char *prefix)
 {
         struct sbuff *m;
-        struct net *net = dev_net(in ? in : out);
 
         /* FIXME: Disabled from containers until syslog ns is supported */
         if (!net_eq(net, &init_net))
@@ -797,7 +797,8 @@ fallback:
 }
 
 static void
-ip6t_log_packet(u_int8_t pf,
+ip6t_log_packet(struct net *net,
+                u_int8_t pf,
                 unsigned int hooknum,
                 const struct sk_buff *skb,
                 const struct net_device *in,
@@ -806,7 +807,6 @@ ip6t_log_packet(u_int8_t pf,
                 const char *prefix)
 {
         struct sbuff *m;
-        struct net *net = dev_net(in ? in : out);
 
         /* FIXME: Disabled from containers until syslog ns is supported */
         if (!net_eq(net, &init_net))
@@ -833,17 +833,18 @@ log_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
         const struct xt_log_info *loginfo = par->targinfo;
         struct nf_loginfo li;
+        struct net *net = dev_net(par->in ? par->in : par->out);
 
         li.type = NF_LOG_TYPE_LOG;
         li.u.log.level = loginfo->level;
         li.u.log.logflags = loginfo->logflags;
 
         if (par->family == NFPROTO_IPV4)
-                ipt_log_packet(NFPROTO_IPV4, par->hooknum, skb, par->in,
+                ipt_log_packet(net, NFPROTO_IPV4, par->hooknum, skb, par->in,
                                par->out, &li, loginfo->prefix);
 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
         else if (par->family == NFPROTO_IPV6)
-                ip6t_log_packet(NFPROTO_IPV6, par->hooknum, skb, par->in,
+                ip6t_log_packet(net, NFPROTO_IPV6, par->hooknum, skb, par->in,
                                 par->out, &li, loginfo->prefix);
 #endif
         else
diff --git a/net/netfilter/xt_NFLOG.c b/net/netfilter/xt_NFLOG.c
index a17dd0f589b2..fb7497c928a0 100644
--- a/net/netfilter/xt_NFLOG.c
+++ b/net/netfilter/xt_NFLOG.c
@@ -26,13 +26,14 @@ nflog_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
         const struct xt_nflog_info *info = par->targinfo;
         struct nf_loginfo li;
+        struct net *net = dev_net(par->in ? par->in : par->out);
 
         li.type              = NF_LOG_TYPE_ULOG;
         li.u.ulog.copy_len   = info->len;
         li.u.ulog.group      = info->group;
         li.u.ulog.qthreshold = info->threshold;
 
-        nfulnl_log_packet(par->family, par->hooknum, skb, par->in,
+        nfulnl_log_packet(net, par->family, par->hooknum, skb, par->in,
                           par->out, &li, info->prefix);
         return XT_CONTINUE;
 }
diff --git a/net/netfilter/xt_TCPOPTSTRIP.c b/net/netfilter/xt_TCPOPTSTRIP.c
index 25fd1c4e1eec..1eb1a44bfd3d 100644
--- a/net/netfilter/xt_TCPOPTSTRIP.c
+++ b/net/netfilter/xt_TCPOPTSTRIP.c
@@ -30,17 +30,28 @@ static inline unsigned int optlen(const u_int8_t *opt, unsigned int offset)
 
 static unsigned int
 tcpoptstrip_mangle_packet(struct sk_buff *skb,
-                          const struct xt_tcpoptstrip_target_info *info,
+                          const struct xt_action_param *par,
                           unsigned int tcphoff, unsigned int minlen)
 {
+        const struct xt_tcpoptstrip_target_info *info = par->targinfo;
         unsigned int optl, i, j;
         struct tcphdr *tcph;
         u_int16_t n, o;
         u_int8_t *opt;
+        int len;
+
+        /* This is a fragment, no TCP header is available */
+        if (par->fragoff != 0)
+                return XT_CONTINUE;
 
         if (!skb_make_writable(skb, skb->len))
                 return NF_DROP;
 
+        len = skb->len - tcphoff;
+        if (len < (int)sizeof(struct tcphdr) ||
+            tcp_hdr(skb)->doff * 4 > len)
+                return NF_DROP;
+
         tcph = (struct tcphdr *)(skb_network_header(skb) + tcphoff);
         opt  = (u_int8_t *)tcph;
 
@@ -76,7 +87,7 @@ tcpoptstrip_mangle_packet(struct sk_buff *skb,
 static unsigned int
 tcpoptstrip_tg4(struct sk_buff *skb, const struct xt_action_param *par)
 {
-        return tcpoptstrip_mangle_packet(skb, par->targinfo, ip_hdrlen(skb),
+        return tcpoptstrip_mangle_packet(skb, par, ip_hdrlen(skb),
                sizeof(struct iphdr) + sizeof(struct tcphdr));
 }
 
@@ -94,7 +105,7 @@ tcpoptstrip_tg6(struct sk_buff *skb, const struct xt_action_param *par)
         if (tcphoff < 0)
                 return NF_DROP;
 
-        return tcpoptstrip_mangle_packet(skb, par->targinfo, tcphoff,
+        return tcpoptstrip_mangle_packet(skb, par, tcphoff,
                sizeof(*ipv6h) + sizeof(struct tcphdr));
 }
 #endif