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TOMOYO Linux Cross Reference
Linux/net/netfilter/nft_lookup.c

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  1 /*
  2  * Copyright (c) 2009 Patrick McHardy <kaber@trash.net>
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  *
  8  * Development of this code funded by Astaro AG (http://www.astaro.com/)
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/init.h>
 13 #include <linux/list.h>
 14 #include <linux/rbtree.h>
 15 #include <linux/netlink.h>
 16 #include <linux/netfilter.h>
 17 #include <linux/netfilter/nf_tables.h>
 18 #include <net/netfilter/nf_tables.h>
 19 #include <net/netfilter/nf_tables_core.h>
 20 
 21 struct nft_lookup {
 22         struct nft_set                  *set;
 23         enum nft_registers              sreg:8;
 24         enum nft_registers              dreg:8;
 25         bool                            invert;
 26         struct nft_set_binding          binding;
 27 };
 28 
 29 static void nft_lookup_eval(const struct nft_expr *expr,
 30                             struct nft_regs *regs,
 31                             const struct nft_pktinfo *pkt)
 32 {
 33         const struct nft_lookup *priv = nft_expr_priv(expr);
 34         const struct nft_set *set = priv->set;
 35         const struct nft_set_ext *ext;
 36         bool found;
 37 
 38         found = set->ops->lookup(nft_net(pkt), set, &regs->data[priv->sreg],
 39                                  &ext) ^ priv->invert;
 40         if (!found) {
 41                 regs->verdict.code = NFT_BREAK;
 42                 return;
 43         }
 44 
 45         if (set->flags & NFT_SET_MAP)
 46                 nft_data_copy(&regs->data[priv->dreg],
 47                               nft_set_ext_data(ext), set->dlen);
 48 
 49 }
 50 
 51 static const struct nla_policy nft_lookup_policy[NFTA_LOOKUP_MAX + 1] = {
 52         [NFTA_LOOKUP_SET]       = { .type = NLA_STRING,
 53                                     .len = NFT_SET_MAXNAMELEN - 1 },
 54         [NFTA_LOOKUP_SET_ID]    = { .type = NLA_U32 },
 55         [NFTA_LOOKUP_SREG]      = { .type = NLA_U32 },
 56         [NFTA_LOOKUP_DREG]      = { .type = NLA_U32 },
 57         [NFTA_LOOKUP_FLAGS]     = { .type = NLA_U32 },
 58 };
 59 
 60 static int nft_lookup_init(const struct nft_ctx *ctx,
 61                            const struct nft_expr *expr,
 62                            const struct nlattr * const tb[])
 63 {
 64         struct nft_lookup *priv = nft_expr_priv(expr);
 65         u8 genmask = nft_genmask_next(ctx->net);
 66         struct nft_set *set;
 67         u32 flags;
 68         int err;
 69 
 70         if (tb[NFTA_LOOKUP_SET] == NULL ||
 71             tb[NFTA_LOOKUP_SREG] == NULL)
 72                 return -EINVAL;
 73 
 74         set = nft_set_lookup(ctx->net, ctx->table, tb[NFTA_LOOKUP_SET],
 75                              tb[NFTA_LOOKUP_SET_ID], genmask);
 76         if (IS_ERR(set))
 77                 return PTR_ERR(set);
 78 
 79         if (set->flags & NFT_SET_EVAL)
 80                 return -EOPNOTSUPP;
 81 
 82         priv->sreg = nft_parse_register(tb[NFTA_LOOKUP_SREG]);
 83         err = nft_validate_register_load(priv->sreg, set->klen);
 84         if (err < 0)
 85                 return err;
 86 
 87         if (tb[NFTA_LOOKUP_FLAGS]) {
 88                 flags = ntohl(nla_get_be32(tb[NFTA_LOOKUP_FLAGS]));
 89 
 90                 if (flags & ~NFT_LOOKUP_F_INV)
 91                         return -EINVAL;
 92 
 93                 if (flags & NFT_LOOKUP_F_INV) {
 94                         if (set->flags & NFT_SET_MAP)
 95                                 return -EINVAL;
 96                         priv->invert = true;
 97                 }
 98         }
 99 
100         if (tb[NFTA_LOOKUP_DREG] != NULL) {
101                 if (priv->invert)
102                         return -EINVAL;
103                 if (!(set->flags & NFT_SET_MAP))
104                         return -EINVAL;
105 
106                 priv->dreg = nft_parse_register(tb[NFTA_LOOKUP_DREG]);
107                 err = nft_validate_register_store(ctx, priv->dreg, NULL,
108                                                   set->dtype, set->dlen);
109                 if (err < 0)
110                         return err;
111         } else if (set->flags & NFT_SET_MAP)
112                 return -EINVAL;
113 
114         priv->binding.flags = set->flags & NFT_SET_MAP;
115 
116         err = nf_tables_bind_set(ctx, set, &priv->binding);
117         if (err < 0)
118                 return err;
119 
120         priv->set = set;
121         return 0;
122 }
123 
124 static void nft_lookup_destroy(const struct nft_ctx *ctx,
125                                const struct nft_expr *expr)
126 {
127         struct nft_lookup *priv = nft_expr_priv(expr);
128 
129         nf_tables_unbind_set(ctx, priv->set, &priv->binding);
130 }
131 
132 static int nft_lookup_dump(struct sk_buff *skb, const struct nft_expr *expr)
133 {
134         const struct nft_lookup *priv = nft_expr_priv(expr);
135         u32 flags = priv->invert ? NFT_LOOKUP_F_INV : 0;
136 
137         if (nla_put_string(skb, NFTA_LOOKUP_SET, priv->set->name))
138                 goto nla_put_failure;
139         if (nft_dump_register(skb, NFTA_LOOKUP_SREG, priv->sreg))
140                 goto nla_put_failure;
141         if (priv->set->flags & NFT_SET_MAP)
142                 if (nft_dump_register(skb, NFTA_LOOKUP_DREG, priv->dreg))
143                         goto nla_put_failure;
144         if (nla_put_be32(skb, NFTA_LOOKUP_FLAGS, htonl(flags)))
145                 goto nla_put_failure;
146         return 0;
147 
148 nla_put_failure:
149         return -1;
150 }
151 
152 static const struct nft_expr_ops nft_lookup_ops = {
153         .type           = &nft_lookup_type,
154         .size           = NFT_EXPR_SIZE(sizeof(struct nft_lookup)),
155         .eval           = nft_lookup_eval,
156         .init           = nft_lookup_init,
157         .destroy        = nft_lookup_destroy,
158         .dump           = nft_lookup_dump,
159 };
160 
161 struct nft_expr_type nft_lookup_type __read_mostly = {
162         .name           = "lookup",
163         .ops            = &nft_lookup_ops,
164         .policy         = nft_lookup_policy,
165         .maxattr        = NFTA_LOOKUP_MAX,
166         .owner          = THIS_MODULE,
167 };
168 

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