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From 6465867eb48506687872b838b1ddfee61d1a0aeb Mon Sep 17 00:00:00 2001
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From: Daniel Borkmann <dborkman@redhat.com>
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Date: Mon, 23 Dec 2013 18:46:29 +0100
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Subject: iptables: add libxt_cgroup frontend
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This patch adds the user space extension/frontend for process matching
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based on cgroups from the kernel patch entitled "netfilter: xtables:
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lightweight process control group matching".
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Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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diff --git a/extensions/libxt_cgroup.c b/extensions/libxt_cgroup.c
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new file mode 100644
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index 0000000..e304e33
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--- /dev/null
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+++ b/extensions/libxt_cgroup.c
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@@ -0,0 +1,67 @@
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+#include <stdio.h>
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+#include <xtables.h>
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+#include <linux/netfilter/xt_cgroup.h>
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+
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+enum {
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+ O_CGROUP = 0,
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+};
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+
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+static void cgroup_help(void)
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+{
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+ printf(
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+"cgroup match options:\n"
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+"[!] --cgroup fwid Match cgroup fwid\n");
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+}
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+
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+static const struct xt_option_entry cgroup_opts[] = {
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+ {
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+ .name = "cgroup",
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+ .id = O_CGROUP,
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+ .type = XTTYPE_UINT32,
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+ .flags = XTOPT_INVERT | XTOPT_MAND | XTOPT_PUT,
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+ XTOPT_POINTER(struct xt_cgroup_info, id)
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+ },
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+ XTOPT_TABLEEND,
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+};
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+
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+static void cgroup_parse(struct xt_option_call *cb)
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+{
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+ struct xt_cgroup_info *cgroupinfo = cb->data;
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+
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+ xtables_option_parse(cb);
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+ if (cb->invert)
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+ cgroupinfo->invert = true;
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+}
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+
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+static void
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+cgroup_print(const void *ip, const struct xt_entry_match *match, int numeric)
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+{
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+ const struct xt_cgroup_info *info = (void *) match->data;
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+
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+ printf(" cgroup %s%u", info->invert ? "! ":"", info->id);
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+}
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+
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+static void cgroup_save(const void *ip, const struct xt_entry_match *match)
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+{
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+ const struct xt_cgroup_info *info = (void *) match->data;
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+
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+ printf("%s --cgroup %u", info->invert ? " !" : "", info->id);
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+}
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+
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+static struct xtables_match cgroup_match = {
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+ .family = NFPROTO_UNSPEC,
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+ .name = "cgroup",
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+ .version = XTABLES_VERSION,
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+ .size = XT_ALIGN(sizeof(struct xt_cgroup_info)),
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+ .userspacesize = XT_ALIGN(sizeof(struct xt_cgroup_info)),
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+ .help = cgroup_help,
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+ .print = cgroup_print,
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+ .save = cgroup_save,
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+ .x6_parse = cgroup_parse,
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+ .x6_options = cgroup_opts,
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+};
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+
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+void _init(void)
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+{
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+ xtables_register_match(&cgroup_match);
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+}
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diff --git a/extensions/libxt_cgroup.man b/extensions/libxt_cgroup.man
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new file mode 100644
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index 0000000..456a031
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--- /dev/null
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+++ b/extensions/libxt_cgroup.man
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@@ -0,0 +1,15 @@
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+.TP
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+[\fB!\fP] \fB\-\-cgroup\fP \fIfwid\fP
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+Match corresponding cgroup for this packet.
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+
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+Can be used to assign particular firewall policies for aggregated
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+task/jobs on the system. This allows for more fine-grained firewall
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+policies that only match for a subset of the system's processes.
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+fwid is the maker set through the net_cls cgroup's id.
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+.PP
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+Example:
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+.PP
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+iptables \-A OUTPUT \-p tcp \-\-sport 80 \-m cgroup ! \-\-cgroup 1
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+\-j DROP
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+.PP
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+Available since Linux 3.14.
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diff --git a/include/linux/netfilter/xt_cgroup.h b/include/linux/netfilter/xt_cgroup.h
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new file mode 100644
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index 0000000..943d3a0
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--- /dev/null
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+++ b/include/linux/netfilter/xt_cgroup.h
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@@ -0,0 +1,11 @@
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+#ifndef _XT_CGROUP_H
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+#define _XT_CGROUP_H
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+
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+#include <linux/types.h>
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+
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+struct xt_cgroup_info {
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+ __u32 id;
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+ __u32 invert;
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+};
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+
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+#endif /* _XT_CGROUP_H */
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--
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cgit v0.10.2
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