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

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  1 /*
  2  * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
  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 
  9 #include <linux/kernel.h>
 10 #include <linux/init.h>
 11 #include <linux/module.h>
 12 #include <linux/netlink.h>
 13 #include <linux/netfilter.h>
 14 #include <linux/netfilter/nf_tables.h>
 15 #include <net/netfilter/nf_nat.h>
 16 #include <net/netfilter/nf_tables.h>
 17 #include <net/netfilter/nft_redir.h>
 18 
 19 const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = {
 20         [NFTA_REDIR_REG_PROTO_MIN]      = { .type = NLA_U32 },
 21         [NFTA_REDIR_REG_PROTO_MAX]      = { .type = NLA_U32 },
 22         [NFTA_REDIR_FLAGS]              = { .type = NLA_U32 },
 23 };
 24 EXPORT_SYMBOL_GPL(nft_redir_policy);
 25 
 26 int nft_redir_validate(const struct nft_ctx *ctx,
 27                        const struct nft_expr *expr,
 28                        const struct nft_data **data)
 29 {
 30         int err;
 31 
 32         err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
 33         if (err < 0)
 34                 return err;
 35 
 36         return nft_chain_validate_hooks(ctx->chain,
 37                                         (1 << NF_INET_PRE_ROUTING) |
 38                                         (1 << NF_INET_LOCAL_OUT));
 39 }
 40 EXPORT_SYMBOL_GPL(nft_redir_validate);
 41 
 42 int nft_redir_init(const struct nft_ctx *ctx,
 43                    const struct nft_expr *expr,
 44                    const struct nlattr * const tb[])
 45 {
 46         struct nft_redir *priv = nft_expr_priv(expr);
 47         unsigned int plen;
 48         int err;
 49 
 50         err = nft_redir_validate(ctx, expr, NULL);
 51         if (err < 0)
 52                 return err;
 53 
 54         plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
 55         if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
 56                 priv->sreg_proto_min =
 57                         nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]);
 58 
 59                 err = nft_validate_register_load(priv->sreg_proto_min, plen);
 60                 if (err < 0)
 61                         return err;
 62 
 63                 if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
 64                         priv->sreg_proto_max =
 65                                 nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]);
 66 
 67                         err = nft_validate_register_load(priv->sreg_proto_max,
 68                                                          plen);
 69                         if (err < 0)
 70                                 return err;
 71                 } else {
 72                         priv->sreg_proto_max = priv->sreg_proto_min;
 73                 }
 74         }
 75 
 76         if (tb[NFTA_REDIR_FLAGS]) {
 77                 priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS]));
 78                 if (priv->flags & ~NF_NAT_RANGE_MASK)
 79                         return -EINVAL;
 80         }
 81 
 82         return 0;
 83 }
 84 EXPORT_SYMBOL_GPL(nft_redir_init);
 85 
 86 int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr)
 87 {
 88         const struct nft_redir *priv = nft_expr_priv(expr);
 89 
 90         if (priv->sreg_proto_min) {
 91                 if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
 92                                       priv->sreg_proto_min))
 93                         goto nla_put_failure;
 94                 if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
 95                                       priv->sreg_proto_max))
 96                         goto nla_put_failure;
 97         }
 98 
 99         if (priv->flags != 0 &&
100             nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags)))
101                         goto nla_put_failure;
102 
103         return 0;
104 
105 nla_put_failure:
106         return -1;
107 }
108 EXPORT_SYMBOL_GPL(nft_redir_dump);
109 
110 MODULE_LICENSE("GPL");
111 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
112 

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