239 lines
6.0 KiB
C
239 lines
6.0 KiB
C
/*
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* Copyright (c) 2012-2016 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 it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#define nft_objref_priv(expr) *((struct nft_object **)nft_expr_priv(expr))
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static void nft_objref_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_object *obj = nft_objref_priv(expr);
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obj->ops->eval(obj, regs, pkt);
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}
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static int nft_objref_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_object *obj = nft_objref_priv(expr);
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u8 genmask = nft_genmask_next(ctx->net);
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u32 objtype;
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if (!tb[NFTA_OBJREF_IMM_NAME] ||
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!tb[NFTA_OBJREF_IMM_TYPE])
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return -EINVAL;
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objtype = ntohl(nla_get_be32(tb[NFTA_OBJREF_IMM_TYPE]));
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obj = nft_obj_lookup(ctx->table, tb[NFTA_OBJREF_IMM_NAME], objtype,
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genmask);
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if (IS_ERR(obj))
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return -ENOENT;
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nft_objref_priv(expr) = obj;
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obj->use++;
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return 0;
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}
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static int nft_objref_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_object *obj = nft_objref_priv(expr);
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if (nla_put_string(skb, NFTA_OBJREF_IMM_NAME, obj->name) ||
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nla_put_be32(skb, NFTA_OBJREF_IMM_TYPE,
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htonl(obj->ops->type->type)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static void nft_objref_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_object *obj = nft_objref_priv(expr);
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obj->use--;
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}
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static struct nft_expr_type nft_objref_type;
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static const struct nft_expr_ops nft_objref_ops = {
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.type = &nft_objref_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_object *)),
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.eval = nft_objref_eval,
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.init = nft_objref_init,
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.destroy = nft_objref_destroy,
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.dump = nft_objref_dump,
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};
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struct nft_objref_map {
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struct nft_set *set;
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enum nft_registers sreg:8;
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struct nft_set_binding binding;
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};
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static void nft_objref_map_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_objref_map *priv = nft_expr_priv(expr);
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const struct nft_set *set = priv->set;
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const struct nft_set_ext *ext;
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struct nft_object *obj;
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bool found;
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found = set->ops->lookup(nft_net(pkt), set, ®s->data[priv->sreg],
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&ext);
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if (!found) {
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regs->verdict.code = NFT_BREAK;
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return;
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}
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obj = *nft_set_ext_obj(ext);
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obj->ops->eval(obj, regs, pkt);
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}
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static int nft_objref_map_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_objref_map *priv = nft_expr_priv(expr);
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u8 genmask = nft_genmask_next(ctx->net);
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struct nft_set *set;
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int err;
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set = nft_set_lookup_global(ctx->net, ctx->table,
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tb[NFTA_OBJREF_SET_NAME],
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tb[NFTA_OBJREF_SET_ID], genmask);
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if (IS_ERR(set))
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return PTR_ERR(set);
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if (!(set->flags & NFT_SET_OBJECT))
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return -EINVAL;
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priv->sreg = nft_parse_register(tb[NFTA_OBJREF_SET_SREG]);
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err = nft_validate_register_load(priv->sreg, set->klen);
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if (err < 0)
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return err;
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priv->binding.flags = set->flags & NFT_SET_OBJECT;
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err = nf_tables_bind_set(ctx, set, &priv->binding);
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if (err < 0)
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return err;
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priv->set = set;
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return 0;
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}
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static int nft_objref_map_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_objref_map *priv = nft_expr_priv(expr);
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if (nft_dump_register(skb, NFTA_OBJREF_SET_SREG, priv->sreg) ||
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nla_put_string(skb, NFTA_OBJREF_SET_NAME, priv->set->name))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static void nft_objref_map_deactivate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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enum nft_trans_phase phase)
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{
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struct nft_objref_map *priv = nft_expr_priv(expr);
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if (phase == NFT_TRANS_PREPARE)
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return;
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nf_tables_unbind_set(ctx, priv->set, &priv->binding,
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phase == NFT_TRANS_COMMIT);
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}
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static void nft_objref_map_destroy(const struct nft_ctx *ctx,
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const struct nft_expr *expr)
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{
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struct nft_objref_map *priv = nft_expr_priv(expr);
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nf_tables_destroy_set(ctx, priv->set);
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}
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static struct nft_expr_type nft_objref_type;
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static const struct nft_expr_ops nft_objref_map_ops = {
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.type = &nft_objref_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_objref_map)),
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.eval = nft_objref_map_eval,
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.init = nft_objref_map_init,
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.deactivate = nft_objref_map_deactivate,
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.destroy = nft_objref_map_destroy,
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.dump = nft_objref_map_dump,
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};
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static const struct nft_expr_ops *
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nft_objref_select_ops(const struct nft_ctx *ctx,
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const struct nlattr * const tb[])
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{
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if (tb[NFTA_OBJREF_SET_SREG] &&
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(tb[NFTA_OBJREF_SET_NAME] ||
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tb[NFTA_OBJREF_SET_ID]))
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return &nft_objref_map_ops;
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else if (tb[NFTA_OBJREF_IMM_NAME] &&
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tb[NFTA_OBJREF_IMM_TYPE])
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return &nft_objref_ops;
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return ERR_PTR(-EOPNOTSUPP);
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}
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static const struct nla_policy nft_objref_policy[NFTA_OBJREF_MAX + 1] = {
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[NFTA_OBJREF_IMM_NAME] = { .type = NLA_STRING,
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.len = NFT_OBJ_MAXNAMELEN - 1 },
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[NFTA_OBJREF_IMM_TYPE] = { .type = NLA_U32 },
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[NFTA_OBJREF_SET_SREG] = { .type = NLA_U32 },
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[NFTA_OBJREF_SET_NAME] = { .type = NLA_STRING,
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.len = NFT_SET_MAXNAMELEN - 1 },
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[NFTA_OBJREF_SET_ID] = { .type = NLA_U32 },
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};
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static struct nft_expr_type nft_objref_type __read_mostly = {
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.name = "objref",
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.select_ops = nft_objref_select_ops,
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.policy = nft_objref_policy,
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.maxattr = NFTA_OBJREF_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_objref_module_init(void)
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{
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return nft_register_expr(&nft_objref_type);
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}
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static void __exit nft_objref_module_exit(void)
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{
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nft_unregister_expr(&nft_objref_type);
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}
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module_init(nft_objref_module_init);
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module_exit(nft_objref_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NFT_EXPR("objref");
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