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kernel: fix and enable layer7 filter

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Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>
This commit is contained in:
Arne Fitzenreiter
2017-03-06 13:36:53 +01:00
parent 8dd1564e6d
commit ddc7b38cc0
8 changed files with 129 additions and 83 deletions
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198
src/patches/linux/linux-4.9.8-layer7-filter.patch → src/patches/linux/linux-4.9.13-layer7.patch
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@@ -1,6 +1,8 @@
diff -Naur linux-4.9.8.org/include/linux/netfilter/xt_layer7.h linux-4.9.8/include/linux/netfilter/xt_layer7.h
--- linux-4.9.8.org/include/linux/netfilter/xt_layer7.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-4.9.8/include/linux/netfilter/xt_layer7.h 2017-02-10 20:55:36.894611414 +0100
diff --git a/include/linux/netfilter/xt_layer7.h b/include/linux/netfilter/xt_layer7.h
new file mode 100644
index 0000000..147cd64
--- /dev/null
+++ b/include/linux/netfilter/xt_layer7.h
@@ -0,0 +1,13 @@
+#ifndef _XT_LAYER7_H
+#define _XT_LAYER7_H
@@ -15,10 +17,11 @@ diff -Naur linux-4.9.8.org/include/linux/netfilter/xt_layer7.h linux-4.9.8/inclu
+};
+
+#endif /* _XT_LAYER7_H */
diff -Naur linux-4.9.8.org/include/net/netfilter/nf_conntrack.h linux-4.9.8/include/net/netfilter/nf_conntrack.h
--- linux-4.9.8.org/include/net/netfilter/nf_conntrack.h 2017-02-04 09:47:29.000000000 +0100
+++ linux-4.9.8/include/net/netfilter/nf_conntrack.h 2017-02-10 16:10:27.000000000 +0100
@@ -120,6 +120,22 @@
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
index d9d52c0..09389b6 100644
--- a/include/net/netfilter/nf_conntrack.h
+++ b/include/net/netfilter/nf_conntrack.h
@@ -120,6 +120,22 @@ struct nf_conn {
/* Extensions */
struct nf_ct_ext *ext;
@@ -41,10 +44,11 @@ diff -Naur linux-4.9.8.org/include/net/netfilter/nf_conntrack.h linux-4.9.8/incl
/* Storage reserved for other modules, must be the last member */
union nf_conntrack_proto proto;
};
diff -Naur linux-4.9.8.org/net/netfilter/Kconfig linux-4.9.8/net/netfilter/Kconfig
--- linux-4.9.8.org/net/netfilter/Kconfig 2017-02-04 09:47:29.000000000 +0100
+++ linux-4.9.8/net/netfilter/Kconfig 2017-02-10 16:10:30.000000000 +0100
@@ -1238,6 +1238,26 @@
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index e8d56d9..ab4ae1d 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -1238,6 +1238,26 @@ config NETFILTER_XT_MATCH_L2TP
To compile it as a module, choose M here. If unsure, say N.
@@ -71,10 +75,11 @@ diff -Naur linux-4.9.8.org/net/netfilter/Kconfig linux-4.9.8/net/netfilter/Kconf
config NETFILTER_XT_MATCH_LENGTH
tristate '"length" match support'
depends on NETFILTER_ADVANCED
diff -Naur linux-4.9.8.org/net/netfilter/Makefile linux-4.9.8/net/netfilter/Makefile
--- linux-4.9.8.org/net/netfilter/Makefile 2017-02-04 09:47:29.000000000 +0100
+++ linux-4.9.8/net/netfilter/Makefile 2017-02-10 16:10:30.000000000 +0100
@@ -174,6 +174,7 @@
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index c23c3c8..916b9d5 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -174,6 +174,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_RECENT) += xt_recent.o
obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o
obj-$(CONFIG_NETFILTER_XT_MATCH_SOCKET) += xt_socket.o
obj-$(CONFIG_NETFILTER_XT_MATCH_STATE) += xt_state.o
@@ -82,27 +87,27 @@ diff -Naur linux-4.9.8.org/net/netfilter/Makefile linux-4.9.8/net/netfilter/Make
obj-$(CONFIG_NETFILTER_XT_MATCH_STATISTIC) += xt_statistic.o
obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o
obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o
diff -Naur linux-4.9.8.org/net/netfilter/nf_conntrack_core.c linux-4.9.8/net/netfilter/nf_conntrack_core.c
--- linux-4.9.8.org/net/netfilter/nf_conntrack_core.c 2017-02-04 09:47:29.000000000 +0100
+++ linux-4.9.8/net/netfilter/nf_conntrack_core.c 2017-02-10 16:10:30.000000000 +0100
@@ -341,6 +341,13 @@
{
struct ct_pcpu *pcpu;
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index 0f87e5d..1f355a0 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -406,6 +406,11 @@ destroy_conntrack(struct nf_conntrack *nfct)
*/
nf_ct_remove_expectations(ct);
+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
+ if(ct->layer7.app_proto)
+ kfree(ct->layer7.app_proto);
+ if(ct->layer7.app_data)
+ kfree(ct->layer7.app_data);
+#endif
+
/* We overload first tuple to link into unconfirmed or dying list.*/
pcpu = per_cpu_ptr(nf_ct_net(ct)->ct.pcpu_lists, ct->cpu);
nf_ct_del_from_dying_or_unconfirmed_list(ct);
diff -Naur linux-4.9.8.org/net/netfilter/nf_conntrack_standalone.c linux-4.9.8/net/netfilter/nf_conntrack_standalone.c
--- linux-4.9.8.org/net/netfilter/nf_conntrack_standalone.c 2017-02-04 09:47:29.000000000 +0100
+++ linux-4.9.8/net/netfilter/nf_conntrack_standalone.c 2017-02-10 16:10:30.000000000 +0100
@@ -274,6 +274,11 @@
local_bh_enable();
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 5f446cd..92f29f9 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -274,6 +274,11 @@ static int ct_seq_show(struct seq_file *s, void *v)
ct_show_zone(s, ct, NF_CT_DEFAULT_ZONE_DIR);
ct_show_delta_time(s, ct);
@@ -114,9 +119,11 @@ diff -Naur linux-4.9.8.org/net/netfilter/nf_conntrack_standalone.c linux-4.9.8/n
seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use));
if (seq_has_overflowed(s))
diff -Naur linux-4.9.8.org/net/netfilter/regexp/regexp.c linux-4.9.8/net/netfilter/regexp/regexp.c
--- linux-4.9.8.org/net/netfilter/regexp/regexp.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-4.9.8/net/netfilter/regexp/regexp.c 2017-02-10 20:55:36.898611415 +0100
diff --git a/net/netfilter/regexp/regexp.c b/net/netfilter/regexp/regexp.c
new file mode 100644
index 0000000..9006988
--- /dev/null
+++ b/net/netfilter/regexp/regexp.c
@@ -0,0 +1,1197 @@
+/*
+ * regcomp and regexec -- regsub and regerror are elsewhere
@@ -1315,9 +1322,11 @@ diff -Naur linux-4.9.8.org/net/netfilter/regexp/regexp.c linux-4.9.8/net/netfilt
+#endif
+
+
diff -Naur linux-4.9.8.org/net/netfilter/regexp/regexp.h linux-4.9.8/net/netfilter/regexp/regexp.h
--- linux-4.9.8.org/net/netfilter/regexp/regexp.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-4.9.8/net/netfilter/regexp/regexp.h 2017-02-10 20:55:36.898611415 +0100
diff --git a/net/netfilter/regexp/regexp.h b/net/netfilter/regexp/regexp.h
new file mode 100644
index 0000000..a72eba7
--- /dev/null
+++ b/net/netfilter/regexp/regexp.h
@@ -0,0 +1,41 @@
+/*
+ * Definitions etc. for regexp(3) routines.
@@ -1360,18 +1369,22 @@ diff -Naur linux-4.9.8.org/net/netfilter/regexp/regexp.h linux-4.9.8/net/netfilt
+void regerror(char *s);
+
+#endif
diff -Naur linux-4.9.8.org/net/netfilter/regexp/regmagic.h linux-4.9.8/net/netfilter/regexp/regmagic.h
--- linux-4.9.8.org/net/netfilter/regexp/regmagic.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-4.9.8/net/netfilter/regexp/regmagic.h 2017-02-10 20:55:36.898611415 +0100
diff --git a/net/netfilter/regexp/regmagic.h b/net/netfilter/regexp/regmagic.h
new file mode 100644
index 0000000..5acf447
--- /dev/null
+++ b/net/netfilter/regexp/regmagic.h
@@ -0,0 +1,5 @@
+/*
+ * The first byte of the regexp internal "program" is actually this magic
+ * number; the start node begins in the second byte.
+ */
+#define MAGIC 0234
diff -Naur linux-4.9.8.org/net/netfilter/regexp/regsub.c linux-4.9.8/net/netfilter/regexp/regsub.c
--- linux-4.9.8.org/net/netfilter/regexp/regsub.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-4.9.8/net/netfilter/regexp/regsub.c 2017-02-10 20:55:36.898611415 +0100
diff --git a/net/netfilter/regexp/regsub.c b/net/netfilter/regexp/regsub.c
new file mode 100644
index 0000000..339631f
--- /dev/null
+++ b/net/netfilter/regexp/regsub.c
@@ -0,0 +1,95 @@
+/*
+ * regsub
@@ -1468,10 +1481,12 @@ diff -Naur linux-4.9.8.org/net/netfilter/regexp/regsub.c linux-4.9.8/net/netfilt
+ }
+ *dst++ = '\0';
+}
diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/xt_layer7.c
--- linux-4.9.8.org/net/netfilter/xt_layer7.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-4.9.8/net/netfilter/xt_layer7.c 2017-02-10 22:42:57.750923134 +0100
@@ -0,0 +1,658 @@
diff --git a/net/netfilter/xt_layer7.c b/net/netfilter/xt_layer7.c
new file mode 100644
index 0000000..ddf7fec
--- /dev/null
+++ b/net/netfilter/xt_layer7.c
@@ -0,0 +1,683 @@
+/*
+ Kernel module to match application layer (OSI layer 7) data in connections.
+
@@ -1511,10 +1526,10 @@ diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/x
+#include "regexp/regexp.c"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>");
+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>, Arne Fitzenreiter <arne_f@ipfire.org>");
+MODULE_DESCRIPTION("iptables application layer match module");
+MODULE_ALIAS("ipt_layer7");
+MODULE_VERSION("2.23");
+MODULE_VERSION("2.30");
+
+static int maxdatalen = 2048; // this is the default
+module_param(maxdatalen, int, 0444);
@@ -1535,6 +1550,11 @@ diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/x
+ struct pattern_cache * next;
+} * first_pattern_cache = NULL;
+
+static struct proto_cache {
+ char * proto_string;
+ struct proto_cache * next;
+} * first_proto_cache = NULL;
+
+DEFINE_SPINLOCK(l7_lock);
+
+static int total_acct_packets(struct nf_conn *ct)
@@ -1684,6 +1704,55 @@ diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/x
+ return node->pattern;
+}
+
+static char * get_protostr_ptr(const char * protocol)
+{
+ struct proto_cache * node = first_proto_cache;
+ struct proto_cache * last_proto_cache = first_proto_cache;
+ struct proto_cache * tmp;
+
+ while (node != NULL) {
+ if (!strcmp(node->proto_string, protocol))
+ return node->proto_string;
+
+ last_proto_cache = node;/* points at the last non-NULL node */
+ node = node->next;
+ }
+
+ /* If we reach the end of the list, then we have not yet cached protocol
+ Be paranoid about running out of memory to avoid list corruption. */
+ tmp = kmalloc(sizeof(struct proto_cache), GFP_ATOMIC);
+
+ if(!tmp) {
+ if (net_ratelimit())
+ printk(KERN_ERR "layer7: out of memory in "
+ "proto_cache add, bailing.\n");
+ return NULL;
+ }
+
+ tmp->proto_string = kmalloc(strlen(protocol) + 1 , GFP_ATOMIC);
+ tmp->next = NULL;
+
+ if(!tmp->proto_string) {
+ if (net_ratelimit())
+ printk(KERN_ERR "layer7: out of memory in "
+ "proto_cache add, bailing.\n");
+ kfree(tmp->proto_string);
+ kfree(tmp);
+ return NULL;
+ }
+
+ /* Ok. The new node is all ready now. */
+ node = tmp;
+
+ if(first_proto_cache == NULL) /* list is empty */
+ first_proto_cache = node; /* make node the beginning */
+ else
+ last_proto_cache->next = node; /* attach node to the end */
+
+ strcpy(node->proto_string, protocol);
+ return node->proto_string;
+}
+
+static int can_handle(const struct sk_buff *skb)
+{
+ if(!ip_hdr(skb)) /* not IP */
@@ -1754,18 +1823,7 @@ diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/x
+ if(master_conntrack->layer7.app_proto){
+ /* Here child connections set their .app_proto (for /proc) */
+ if(!conntrack->layer7.app_proto) {
+ conntrack->layer7.app_proto =
+ kmalloc(strlen(master_conntrack->layer7.app_proto)+1,
+ GFP_ATOMIC);
+ if(!conntrack->layer7.app_proto){
+ if (net_ratelimit())
+ printk(KERN_ERR "layer7: out of memory "
+ "in match_no_append, "
+ "bailing.\n");
+ return 1;
+ }
+ strcpy(conntrack->layer7.app_proto,
+ master_conntrack->layer7.app_proto);
+ conntrack->layer7.app_proto = master_conntrack->layer7.app_proto;
+ }
+
+ return (!strcmp(master_conntrack->layer7.app_proto,
@@ -1774,15 +1832,7 @@ diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/x
+ else {
+ /* If not classified, set to "unknown" to distinguish from
+ connections that are still being tested. */
+ master_conntrack->layer7.app_proto =
+ kmalloc(strlen("unknown")+1, GFP_ATOMIC);
+ if(!master_conntrack->layer7.app_proto){
+ if (net_ratelimit())
+ printk(KERN_ERR "layer7: out of memory in "
+ "match_no_append, bailing.\n");
+ return 1;
+ }
+ strcpy(master_conntrack->layer7.app_proto, "unknown");
+ master_conntrack->layer7.app_proto = get_protostr_ptr("unknown");
+ return 0;
+ }
+}
@@ -1982,7 +2032,6 @@ diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/x
+ if(!skb->cb[0]){
+ int newbytes;
+ newbytes = add_data(master_conntrack, app_data, appdatalen);
+
+ if(newbytes == 0) { /* didn't add any data */
+ skb->cb[0] = 1;
+ /* Didn't match before, not going to match now */
@@ -2010,16 +2059,7 @@ diff -Naur linux-4.9.8.org/net/netfilter/xt_layer7.c linux-4.9.8/net/netfilter/x
+ } else pattern_result = 0;
+
+ if(pattern_result == 1) {
+ master_conntrack->layer7.app_proto =
+ kmalloc(strlen(info->protocol)+1, GFP_ATOMIC);
+ if(!master_conntrack->layer7.app_proto){
+ if (net_ratelimit())
+ printk(KERN_ERR "layer7: out of memory in "
+ "match, bailing.\n");
+ spin_unlock_bh(&l7_lock);
+ return (pattern_result ^ info->invert);
+ }
+ strcpy(master_conntrack->layer7.app_proto, info->protocol);
+ master_conntrack->layer7.app_proto=get_protostr_ptr(info->protocol);
+ } else if(pattern_result > 1) { /* cleanup from "unset" */
+ pattern_result = 1;
+ }