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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /net/netfilter/xt_connlabel.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/netfilter/xt_connlabel.c')
-rw-r--r-- | net/netfilter/xt_connlabel.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/net/netfilter/xt_connlabel.c b/net/netfilter/xt_connlabel.c new file mode 100644 index 0000000000..87505cdad5 --- /dev/null +++ b/net/netfilter/xt_connlabel.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * (C) 2013 Astaro GmbH & Co KG + */ + +#include <linux/module.h> +#include <linux/skbuff.h> +#include <net/netfilter/nf_conntrack.h> +#include <net/netfilter/nf_conntrack_ecache.h> +#include <net/netfilter/nf_conntrack_labels.h> +#include <linux/netfilter/x_tables.h> + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Florian Westphal <fw@strlen.de>"); +MODULE_DESCRIPTION("Xtables: add/match connection tracking labels"); +MODULE_ALIAS("ipt_connlabel"); +MODULE_ALIAS("ip6t_connlabel"); + +static bool +connlabel_mt(const struct sk_buff *skb, struct xt_action_param *par) +{ + const struct xt_connlabel_mtinfo *info = par->matchinfo; + enum ip_conntrack_info ctinfo; + struct nf_conn_labels *labels; + struct nf_conn *ct; + bool invert = info->options & XT_CONNLABEL_OP_INVERT; + + ct = nf_ct_get(skb, &ctinfo); + if (ct == NULL) + return invert; + + labels = nf_ct_labels_find(ct); + if (!labels) + return invert; + + if (test_bit(info->bit, labels->bits)) + return !invert; + + if (info->options & XT_CONNLABEL_OP_SET) { + if (!test_and_set_bit(info->bit, labels->bits)) + nf_conntrack_event_cache(IPCT_LABEL, ct); + + return !invert; + } + + return invert; +} + +static int connlabel_mt_check(const struct xt_mtchk_param *par) +{ + const int options = XT_CONNLABEL_OP_INVERT | + XT_CONNLABEL_OP_SET; + struct xt_connlabel_mtinfo *info = par->matchinfo; + int ret; + + if (info->options & ~options) { + pr_info_ratelimited("Unknown options in mask %x\n", + info->options); + return -EINVAL; + } + + ret = nf_ct_netns_get(par->net, par->family); + if (ret < 0) { + pr_info_ratelimited("cannot load conntrack support for proto=%u\n", + par->family); + return ret; + } + + ret = nf_connlabels_get(par->net, info->bit); + if (ret < 0) + nf_ct_netns_put(par->net, par->family); + return ret; +} + +static void connlabel_mt_destroy(const struct xt_mtdtor_param *par) +{ + nf_connlabels_put(par->net); + nf_ct_netns_put(par->net, par->family); +} + +static struct xt_match connlabels_mt_reg __read_mostly = { + .name = "connlabel", + .family = NFPROTO_UNSPEC, + .checkentry = connlabel_mt_check, + .match = connlabel_mt, + .matchsize = sizeof(struct xt_connlabel_mtinfo), + .destroy = connlabel_mt_destroy, + .me = THIS_MODULE, +}; + +static int __init connlabel_mt_init(void) +{ + return xt_register_match(&connlabels_mt_reg); +} + +static void __exit connlabel_mt_exit(void) +{ + xt_unregister_match(&connlabels_mt_reg); +} + +module_init(connlabel_mt_init); +module_exit(connlabel_mt_exit); |