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@@ -0,0 +1,768 @@
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+/*
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+ * (C) 2012-2013 by Pablo Neira Ayuso <pablo@netfilter.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
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+ */
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+
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/netlink.h>
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+#include <linux/netfilter.h>
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+#include <linux/netfilter/nfnetlink.h>
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+#include <linux/netfilter/nf_tables.h>
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+#include <linux/netfilter/nf_tables_compat.h>
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+#include <linux/netfilter/x_tables.h>
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+#include <linux/netfilter_ipv4/ip_tables.h>
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+#include <linux/netfilter_ipv6/ip6_tables.h>
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+#include <asm/uaccess.h> /* for set_fs */
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+#include <net/netfilter/nf_tables.h>
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+
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+union nft_entry {
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+ struct ipt_entry e4;
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+ struct ip6t_entry e6;
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+};
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+
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+static inline void
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+nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info)
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+{
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+ par->target = xt;
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+ par->targinfo = xt_info;
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+ par->hotdrop = false;
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+}
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+
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+static void nft_target_eval(const struct nft_expr *expr,
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+ struct nft_data data[NFT_REG_MAX + 1],
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+ const struct nft_pktinfo *pkt)
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+{
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+ void *info = nft_expr_priv(expr);
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+ struct xt_target *target = expr->ops->data;
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+ struct sk_buff *skb = pkt->skb;
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+ int ret;
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+
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+ nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info);
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+
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+ ret = target->target(skb, &pkt->xt);
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+
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+ if (pkt->xt.hotdrop)
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+ ret = NF_DROP;
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+
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+ switch(ret) {
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+ case XT_CONTINUE:
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+ data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
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+ break;
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+ default:
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+ data[NFT_REG_VERDICT].verdict = ret;
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+ break;
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+ }
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+ return;
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+}
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+
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+static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
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+ [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING },
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+ [NFTA_TARGET_REV] = { .type = NLA_U32 },
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+ [NFTA_TARGET_INFO] = { .type = NLA_BINARY },
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+};
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+
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+static void
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+nft_target_set_tgchk_param(struct xt_tgchk_param *par,
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+ const struct nft_ctx *ctx,
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+ struct xt_target *target, void *info,
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+ union nft_entry *entry, u8 proto, bool inv)
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+{
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+ par->net = &init_net;
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+ par->table = ctx->table->name;
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+ switch (ctx->afi->family) {
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+ case AF_INET:
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+ entry->e4.ip.proto = proto;
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+ entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
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+ break;
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+ case AF_INET6:
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+ entry->e6.ipv6.proto = proto;
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+ entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
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+ break;
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+ }
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+ par->entryinfo = entry;
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+ par->target = target;
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+ par->targinfo = info;
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+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
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+ const struct nft_base_chain *basechain =
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+ nft_base_chain(ctx->chain);
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+ const struct nf_hook_ops *ops = &basechain->ops;
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+
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+ par->hook_mask = 1 << ops->hooknum;
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+ }
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+ par->family = ctx->afi->family;
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+}
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+
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+static void target_compat_from_user(struct xt_target *t, void *in, void *out)
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+{
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+#ifdef CONFIG_COMPAT
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+ if (t->compat_from_user) {
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+ int pad;
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+
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+ t->compat_from_user(out, in);
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+ pad = XT_ALIGN(t->targetsize) - t->targetsize;
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+ if (pad > 0)
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+ memset(out + t->targetsize, 0, pad);
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+ } else
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+#endif
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+ memcpy(out, in, XT_ALIGN(t->targetsize));
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+}
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+
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+static inline int nft_compat_target_offset(struct xt_target *target)
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+{
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+#ifdef CONFIG_COMPAT
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+ return xt_compat_target_offset(target);
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+#else
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+ return 0;
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+#endif
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+}
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+
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+static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = {
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+ [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 },
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+ [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 },
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+};
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+
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+static u8 nft_parse_compat(const struct nlattr *attr, bool *inv)
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+{
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+ struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
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+ u32 flags;
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+ int err;
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+
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+ err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr,
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+ nft_rule_compat_policy);
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+ if (err < 0)
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+ return err;
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+
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+ if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
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+ return -EINVAL;
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+
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+ flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
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+ if (flags & ~NFT_RULE_COMPAT_F_MASK)
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+ return -EINVAL;
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+ if (flags & NFT_RULE_COMPAT_F_INV)
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+ *inv = true;
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+
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+ return ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
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+}
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+
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+static int
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+nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
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+ const struct nlattr * const tb[])
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+{
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+ void *info = nft_expr_priv(expr);
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+ struct xt_target *target = expr->ops->data;
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+ struct xt_tgchk_param par;
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+ size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
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+ u8 proto = 0;
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+ bool inv = false;
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+ union nft_entry e = {};
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+ int ret;
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+
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+ target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
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+
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+ if (ctx->nla[NFTA_RULE_COMPAT])
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+ proto = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &inv);
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+
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+ nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
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+
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+ ret = xt_check_target(&par, size, proto, inv);
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+ if (ret < 0)
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+ goto err;
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+
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+ /* The standard target cannot be used */
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+ if (target->target == NULL) {
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+ ret = -EINVAL;
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+ goto err;
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+ }
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+
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+ return 0;
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+err:
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+ module_put(target->me);
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+ return ret;
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+}
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+
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+static void
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+nft_target_destroy(const struct nft_expr *expr)
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+{
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+ struct xt_target *target = expr->ops->data;
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+
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+ module_put(target->me);
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+}
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+
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+static int
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+target_dump_info(struct sk_buff *skb, const struct xt_target *t, const void *in)
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+{
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+ int ret;
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+
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+#ifdef CONFIG_COMPAT
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+ if (t->compat_to_user) {
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+ mm_segment_t old_fs;
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+ void *out;
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+
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+ out = kmalloc(XT_ALIGN(t->targetsize), GFP_ATOMIC);
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+ if (out == NULL)
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+ return -ENOMEM;
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+
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+ /* We want to reuse existing compat_to_user */
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+ old_fs = get_fs();
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+ set_fs(KERNEL_DS);
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+ t->compat_to_user(out, in);
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+ set_fs(old_fs);
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+ ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), out);
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+ kfree(out);
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+ } else
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+#endif
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+ ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), in);
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+
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+ return ret;
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+}
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+
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+static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr)
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+{
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+ const struct xt_target *target = expr->ops->data;
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+ void *info = nft_expr_priv(expr);
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+
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+ if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
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+ nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
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+ target_dump_info(skb, target, info))
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+ goto nla_put_failure;
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+
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+ return 0;
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+
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+nla_put_failure:
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+ return -1;
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+}
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+
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+static int nft_target_validate(const struct nft_ctx *ctx,
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+ const struct nft_expr *expr,
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+ const struct nft_data **data)
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+{
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+ struct xt_target *target = expr->ops->data;
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+ unsigned int hook_mask = 0;
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+
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+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
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+ const struct nft_base_chain *basechain =
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+ nft_base_chain(ctx->chain);
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+ const struct nf_hook_ops *ops = &basechain->ops;
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+
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+ hook_mask = 1 << ops->hooknum;
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+ if (hook_mask & target->hooks)
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+ return 0;
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+
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+ /* This target is being called from an invalid chain */
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+ return -EINVAL;
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+ }
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+ return 0;
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+}
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+
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+static void nft_match_eval(const struct nft_expr *expr,
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+ struct nft_data data[NFT_REG_MAX + 1],
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+ const struct nft_pktinfo *pkt)
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+{
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+ void *info = nft_expr_priv(expr);
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+ struct xt_match *match = expr->ops->data;
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+ struct sk_buff *skb = pkt->skb;
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+ bool ret;
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+
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+ nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info);
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+
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+ ret = match->match(skb, (struct xt_action_param *)&pkt->xt);
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+
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+ if (pkt->xt.hotdrop) {
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+ data[NFT_REG_VERDICT].verdict = NF_DROP;
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+ return;
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+ }
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+
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+ switch(ret) {
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+ case true:
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+ data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
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+ break;
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+ case false:
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+ data[NFT_REG_VERDICT].verdict = NFT_BREAK;
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+ break;
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+ }
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+}
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+
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+static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
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+ [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
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+ [NFTA_MATCH_REV] = { .type = NLA_U32 },
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+ [NFTA_MATCH_INFO] = { .type = NLA_BINARY },
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+};
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+
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+/* struct xt_mtchk_param and xt_tgchk_param look very similar */
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+static void
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+nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
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+ struct xt_match *match, void *info,
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+ union nft_entry *entry, u8 proto, bool inv)
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+{
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+ par->net = &init_net;
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+ par->table = ctx->table->name;
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+ switch (ctx->afi->family) {
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+ case AF_INET:
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+ entry->e4.ip.proto = proto;
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+ entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
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+ break;
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+ case AF_INET6:
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+ entry->e6.ipv6.proto = proto;
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+ entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
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+ break;
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+ }
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+ par->entryinfo = entry;
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+ par->match = match;
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+ par->matchinfo = info;
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+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
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+ const struct nft_base_chain *basechain =
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+ nft_base_chain(ctx->chain);
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+ const struct nf_hook_ops *ops = &basechain->ops;
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+
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+ par->hook_mask = 1 << ops->hooknum;
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+ }
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+ par->family = ctx->afi->family;
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+}
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+
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+static void match_compat_from_user(struct xt_match *m, void *in, void *out)
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+{
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+#ifdef CONFIG_COMPAT
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+ if (m->compat_from_user) {
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+ int pad;
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+
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+ m->compat_from_user(out, in);
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+ pad = XT_ALIGN(m->matchsize) - m->matchsize;
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+ if (pad > 0)
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+ memset(out + m->matchsize, 0, pad);
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+ } else
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+#endif
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+ memcpy(out, in, XT_ALIGN(m->matchsize));
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+}
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+
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+static int
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+nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
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+ const struct nlattr * const tb[])
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+{
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+ void *info = nft_expr_priv(expr);
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+ struct xt_match *match = expr->ops->data;
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+ struct xt_mtchk_param par;
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+ size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
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+ u8 proto = 0;
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+ bool inv = false;
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+ union nft_entry e = {};
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+ int ret;
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+
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+ match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
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+
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+ if (ctx->nla[NFTA_RULE_COMPAT])
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+ proto = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &inv);
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+
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+ nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
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+
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+ ret = xt_check_match(&par, size, proto, inv);
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+ if (ret < 0)
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+ goto err;
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+
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+ return 0;
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+err:
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+ module_put(match->me);
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+ return ret;
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+}
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+
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+static void
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+nft_match_destroy(const struct nft_expr *expr)
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+{
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+ struct xt_match *match = expr->ops->data;
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+
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+ module_put(match->me);
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+}
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+
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+static int
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+match_dump_info(struct sk_buff *skb, const struct xt_match *m, const void *in)
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+{
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+ int ret;
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+
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+#ifdef CONFIG_COMPAT
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+ if (m->compat_to_user) {
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+ mm_segment_t old_fs;
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+ void *out;
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+
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+ out = kmalloc(XT_ALIGN(m->matchsize), GFP_ATOMIC);
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+ if (out == NULL)
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+ return -ENOMEM;
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+
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+ /* We want to reuse existing compat_to_user */
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+ old_fs = get_fs();
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+ set_fs(KERNEL_DS);
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+ m->compat_to_user(out, in);
|
|
|
+ set_fs(old_fs);
|
|
|
+ ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), out);
|
|
|
+ kfree(out);
|
|
|
+ } else
|
|
|
+#endif
|
|
|
+ ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), in);
|
|
|
+
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static inline int nft_compat_match_offset(struct xt_match *match)
|
|
|
+{
|
|
|
+#ifdef CONFIG_COMPAT
|
|
|
+ return xt_compat_match_offset(match);
|
|
|
+#else
|
|
|
+ return 0;
|
|
|
+#endif
|
|
|
+}
|
|
|
+
|
|
|
+static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
|
|
+{
|
|
|
+ void *info = nft_expr_priv(expr);
|
|
|
+ struct xt_match *match = expr->ops->data;
|
|
|
+
|
|
|
+ if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
|
|
|
+ nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
|
|
|
+ match_dump_info(skb, match, info))
|
|
|
+ goto nla_put_failure;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+
|
|
|
+nla_put_failure:
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+static int nft_match_validate(const struct nft_ctx *ctx,
|
|
|
+ const struct nft_expr *expr,
|
|
|
+ const struct nft_data **data)
|
|
|
+{
|
|
|
+ struct xt_match *match = expr->ops->data;
|
|
|
+ unsigned int hook_mask = 0;
|
|
|
+
|
|
|
+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
|
|
|
+ const struct nft_base_chain *basechain =
|
|
|
+ nft_base_chain(ctx->chain);
|
|
|
+ const struct nf_hook_ops *ops = &basechain->ops;
|
|
|
+
|
|
|
+ hook_mask = 1 << ops->hooknum;
|
|
|
+ if (hook_mask & match->hooks)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ /* This match is being called from an invalid chain */
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
|
|
|
+ int event, u16 family, const char *name,
|
|
|
+ int rev, int target)
|
|
|
+{
|
|
|
+ struct nlmsghdr *nlh;
|
|
|
+ struct nfgenmsg *nfmsg;
|
|
|
+ unsigned int flags = portid ? NLM_F_MULTI : 0;
|
|
|
+
|
|
|
+ event |= NFNL_SUBSYS_NFT_COMPAT << 8;
|
|
|
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
|
|
|
+ if (nlh == NULL)
|
|
|
+ goto nlmsg_failure;
|
|
|
+
|
|
|
+ nfmsg = nlmsg_data(nlh);
|
|
|
+ nfmsg->nfgen_family = family;
|
|
|
+ nfmsg->version = NFNETLINK_V0;
|
|
|
+ nfmsg->res_id = 0;
|
|
|
+
|
|
|
+ if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
|
|
|
+ nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
|
|
|
+ nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
|
|
|
+ goto nla_put_failure;
|
|
|
+
|
|
|
+ nlmsg_end(skb, nlh);
|
|
|
+ return skb->len;
|
|
|
+
|
|
|
+nlmsg_failure:
|
|
|
+nla_put_failure:
|
|
|
+ nlmsg_cancel(skb, nlh);
|
|
|
+ return -1;
|
|
|
+}
|
|
|
+
|
|
|
+static int
|
|
|
+nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb,
|
|
|
+ const struct nlmsghdr *nlh, const struct nlattr * const tb[])
|
|
|
+{
|
|
|
+ int ret = 0, target;
|
|
|
+ struct nfgenmsg *nfmsg;
|
|
|
+ const char *fmt;
|
|
|
+ const char *name;
|
|
|
+ u32 rev;
|
|
|
+ struct sk_buff *skb2;
|
|
|
+
|
|
|
+ if (tb[NFTA_COMPAT_NAME] == NULL ||
|
|
|
+ tb[NFTA_COMPAT_REV] == NULL ||
|
|
|
+ tb[NFTA_COMPAT_TYPE] == NULL)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ name = nla_data(tb[NFTA_COMPAT_NAME]);
|
|
|
+ rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
|
|
|
+ target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
|
|
|
+
|
|
|
+ nfmsg = nlmsg_data(nlh);
|
|
|
+
|
|
|
+ switch(nfmsg->nfgen_family) {
|
|
|
+ case AF_INET:
|
|
|
+ fmt = "ipt_%s";
|
|
|
+ break;
|
|
|
+ case AF_INET6:
|
|
|
+ fmt = "ip6t_%s";
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ pr_err("nft_compat: unsupported protocol %d\n",
|
|
|
+ nfmsg->nfgen_family);
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name,
|
|
|
+ rev, target, &ret),
|
|
|
+ fmt, name);
|
|
|
+
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
|
+ if (skb2 == NULL)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ /* include the best revision for this extension in the message */
|
|
|
+ if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
|
|
|
+ nlh->nlmsg_seq,
|
|
|
+ NFNL_MSG_TYPE(nlh->nlmsg_type),
|
|
|
+ NFNL_MSG_COMPAT_GET,
|
|
|
+ nfmsg->nfgen_family,
|
|
|
+ name, ret, target) <= 0) {
|
|
|
+ kfree_skb(skb2);
|
|
|
+ return -ENOSPC;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
|
|
|
+ MSG_DONTWAIT);
|
|
|
+ if (ret > 0)
|
|
|
+ ret = 0;
|
|
|
+
|
|
|
+ return ret == -EAGAIN ? -ENOBUFS : ret;
|
|
|
+}
|
|
|
+
|
|
|
+static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
|
|
|
+ [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
|
|
|
+ .len = NFT_COMPAT_NAME_MAX-1 },
|
|
|
+ [NFTA_COMPAT_REV] = { .type = NLA_U32 },
|
|
|
+ [NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
|
|
|
+};
|
|
|
+
|
|
|
+static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
|
|
|
+ [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get,
|
|
|
+ .attr_count = NFTA_COMPAT_MAX,
|
|
|
+ .policy = nfnl_compat_policy_get },
|
|
|
+};
|
|
|
+
|
|
|
+static const struct nfnetlink_subsystem nfnl_compat_subsys = {
|
|
|
+ .name = "nft-compat",
|
|
|
+ .subsys_id = NFNL_SUBSYS_NFT_COMPAT,
|
|
|
+ .cb_count = NFNL_MSG_COMPAT_MAX,
|
|
|
+ .cb = nfnl_nft_compat_cb,
|
|
|
+};
|
|
|
+
|
|
|
+static LIST_HEAD(nft_match_list);
|
|
|
+
|
|
|
+struct nft_xt {
|
|
|
+ struct list_head head;
|
|
|
+ struct nft_expr_ops ops;
|
|
|
+};
|
|
|
+
|
|
|
+static struct nft_expr_type nft_match_type;
|
|
|
+
|
|
|
+static const struct nft_expr_ops *
|
|
|
+nft_match_select_ops(const struct nft_ctx *ctx,
|
|
|
+ const struct nlattr * const tb[])
|
|
|
+{
|
|
|
+ struct nft_xt *nft_match;
|
|
|
+ struct xt_match *match;
|
|
|
+ char *mt_name;
|
|
|
+ __u32 rev, family;
|
|
|
+
|
|
|
+ if (tb[NFTA_MATCH_NAME] == NULL ||
|
|
|
+ tb[NFTA_MATCH_REV] == NULL ||
|
|
|
+ tb[NFTA_MATCH_INFO] == NULL)
|
|
|
+ return ERR_PTR(-EINVAL);
|
|
|
+
|
|
|
+ mt_name = nla_data(tb[NFTA_MATCH_NAME]);
|
|
|
+ rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
|
|
|
+ family = ctx->afi->family;
|
|
|
+
|
|
|
+ /* Re-use the existing match if it's already loaded. */
|
|
|
+ list_for_each_entry(nft_match, &nft_match_list, head) {
|
|
|
+ struct xt_match *match = nft_match->ops.data;
|
|
|
+
|
|
|
+ if (strcmp(match->name, mt_name) == 0 &&
|
|
|
+ match->revision == rev && match->family == family)
|
|
|
+ return &nft_match->ops;
|
|
|
+ }
|
|
|
+
|
|
|
+ match = xt_request_find_match(family, mt_name, rev);
|
|
|
+ if (IS_ERR(match))
|
|
|
+ return ERR_PTR(-ENOENT);
|
|
|
+
|
|
|
+ /* This is the first time we use this match, allocate operations */
|
|
|
+ nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
|
|
|
+ if (nft_match == NULL)
|
|
|
+ return ERR_PTR(-ENOMEM);
|
|
|
+
|
|
|
+ nft_match->ops.type = &nft_match_type;
|
|
|
+ nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize) +
|
|
|
+ nft_compat_match_offset(match));
|
|
|
+ nft_match->ops.eval = nft_match_eval;
|
|
|
+ nft_match->ops.init = nft_match_init;
|
|
|
+ nft_match->ops.destroy = nft_match_destroy;
|
|
|
+ nft_match->ops.dump = nft_match_dump;
|
|
|
+ nft_match->ops.validate = nft_match_validate;
|
|
|
+ nft_match->ops.data = match;
|
|
|
+
|
|
|
+ list_add(&nft_match->head, &nft_match_list);
|
|
|
+
|
|
|
+ return &nft_match->ops;
|
|
|
+}
|
|
|
+
|
|
|
+static void nft_match_release(void)
|
|
|
+{
|
|
|
+ struct nft_xt *nft_match;
|
|
|
+
|
|
|
+ list_for_each_entry(nft_match, &nft_match_list, head)
|
|
|
+ kfree(nft_match);
|
|
|
+}
|
|
|
+
|
|
|
+static struct nft_expr_type nft_match_type __read_mostly = {
|
|
|
+ .name = "match",
|
|
|
+ .select_ops = nft_match_select_ops,
|
|
|
+ .policy = nft_match_policy,
|
|
|
+ .maxattr = NFTA_MATCH_MAX,
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+};
|
|
|
+
|
|
|
+static LIST_HEAD(nft_target_list);
|
|
|
+
|
|
|
+static struct nft_expr_type nft_target_type;
|
|
|
+
|
|
|
+static const struct nft_expr_ops *
|
|
|
+nft_target_select_ops(const struct nft_ctx *ctx,
|
|
|
+ const struct nlattr * const tb[])
|
|
|
+{
|
|
|
+ struct nft_xt *nft_target;
|
|
|
+ struct xt_target *target;
|
|
|
+ char *tg_name;
|
|
|
+ __u32 rev, family;
|
|
|
+
|
|
|
+ if (tb[NFTA_TARGET_NAME] == NULL ||
|
|
|
+ tb[NFTA_TARGET_REV] == NULL ||
|
|
|
+ tb[NFTA_TARGET_INFO] == NULL)
|
|
|
+ return ERR_PTR(-EINVAL);
|
|
|
+
|
|
|
+ tg_name = nla_data(tb[NFTA_TARGET_NAME]);
|
|
|
+ rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
|
|
|
+ family = ctx->afi->family;
|
|
|
+
|
|
|
+ /* Re-use the existing target if it's already loaded. */
|
|
|
+ list_for_each_entry(nft_target, &nft_match_list, head) {
|
|
|
+ struct xt_target *target = nft_target->ops.data;
|
|
|
+
|
|
|
+ if (strcmp(target->name, tg_name) == 0 &&
|
|
|
+ target->revision == rev && target->family == family)
|
|
|
+ return &nft_target->ops;
|
|
|
+ }
|
|
|
+
|
|
|
+ target = xt_request_find_target(family, tg_name, rev);
|
|
|
+ if (IS_ERR(target))
|
|
|
+ return ERR_PTR(-ENOENT);
|
|
|
+
|
|
|
+ /* This is the first time we use this target, allocate operations */
|
|
|
+ nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
|
|
|
+ if (nft_target == NULL)
|
|
|
+ return ERR_PTR(-ENOMEM);
|
|
|
+
|
|
|
+ nft_target->ops.type = &nft_target_type;
|
|
|
+ nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize) +
|
|
|
+ nft_compat_target_offset(target));
|
|
|
+ nft_target->ops.eval = nft_target_eval;
|
|
|
+ nft_target->ops.init = nft_target_init;
|
|
|
+ nft_target->ops.destroy = nft_target_destroy;
|
|
|
+ nft_target->ops.dump = nft_target_dump;
|
|
|
+ nft_target->ops.validate = nft_target_validate;
|
|
|
+ nft_target->ops.data = target;
|
|
|
+
|
|
|
+ list_add(&nft_target->head, &nft_target_list);
|
|
|
+
|
|
|
+ return &nft_target->ops;
|
|
|
+}
|
|
|
+
|
|
|
+static void nft_target_release(void)
|
|
|
+{
|
|
|
+ struct nft_xt *nft_target;
|
|
|
+
|
|
|
+ list_for_each_entry(nft_target, &nft_target_list, head)
|
|
|
+ kfree(nft_target);
|
|
|
+}
|
|
|
+
|
|
|
+static struct nft_expr_type nft_target_type __read_mostly = {
|
|
|
+ .name = "target",
|
|
|
+ .select_ops = nft_target_select_ops,
|
|
|
+ .policy = nft_target_policy,
|
|
|
+ .maxattr = NFTA_TARGET_MAX,
|
|
|
+ .owner = THIS_MODULE,
|
|
|
+};
|
|
|
+
|
|
|
+static int __init nft_compat_module_init(void)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ ret = nft_register_expr(&nft_match_type);
|
|
|
+ if (ret < 0)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ ret = nft_register_expr(&nft_target_type);
|
|
|
+ if (ret < 0)
|
|
|
+ goto err_match;
|
|
|
+
|
|
|
+ ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
|
|
|
+ if (ret < 0) {
|
|
|
+ pr_err("nft_compat: cannot register with nfnetlink.\n");
|
|
|
+ goto err_target;
|
|
|
+ }
|
|
|
+
|
|
|
+ pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n");
|
|
|
+
|
|
|
+ return ret;
|
|
|
+
|
|
|
+err_target:
|
|
|
+ nft_unregister_expr(&nft_target_type);
|
|
|
+err_match:
|
|
|
+ nft_unregister_expr(&nft_match_type);
|
|
|
+ return ret;
|
|
|
+}
|
|
|
+
|
|
|
+static void __exit nft_compat_module_exit(void)
|
|
|
+{
|
|
|
+ nfnetlink_subsys_unregister(&nfnl_compat_subsys);
|
|
|
+ nft_unregister_expr(&nft_target_type);
|
|
|
+ nft_unregister_expr(&nft_match_type);
|
|
|
+ nft_match_release();
|
|
|
+ nft_target_release();
|
|
|
+}
|
|
|
+
|
|
|
+MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
|
|
|
+
|
|
|
+module_init(nft_compat_module_init);
|
|
|
+module_exit(nft_compat_module_exit);
|
|
|
+
|
|
|
+MODULE_LICENSE("GPL");
|
|
|
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
|
|
|
+MODULE_ALIAS_NFT_EXPR("match");
|
|
|
+MODULE_ALIAS_NFT_EXPR("target");
|
Pablo Neira Ayuso