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

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  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License version 2 as
  4  * published by the Free Software Foundation.
  5  *
  6  * Generic part shared by ipv4 and ipv6 backends.
  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_tables_core.h>
 16 #include <net/netfilter/nf_tables.h>
 17 #include <net/netfilter/nft_fib.h>
 18 
 19 const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
 20         [NFTA_FIB_DREG]         = { .type = NLA_U32 },
 21         [NFTA_FIB_RESULT]       = { .type = NLA_U32 },
 22         [NFTA_FIB_FLAGS]        = { .type = NLA_U32 },
 23 };
 24 EXPORT_SYMBOL(nft_fib_policy);
 25 
 26 #define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
 27                         NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF | \
 28                         NFTA_FIB_F_PRESENT)
 29 
 30 int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
 31                      const struct nft_data **data)
 32 {
 33         const struct nft_fib *priv = nft_expr_priv(expr);
 34         unsigned int hooks;
 35 
 36         switch (priv->result) {
 37         case NFT_FIB_RESULT_OIF: /* fallthrough */
 38         case NFT_FIB_RESULT_OIFNAME:
 39                 hooks = (1 << NF_INET_PRE_ROUTING);
 40                 break;
 41         case NFT_FIB_RESULT_ADDRTYPE:
 42                 if (priv->flags & NFTA_FIB_F_IIF)
 43                         hooks = (1 << NF_INET_PRE_ROUTING) |
 44                                 (1 << NF_INET_LOCAL_IN) |
 45                                 (1 << NF_INET_FORWARD);
 46                 else if (priv->flags & NFTA_FIB_F_OIF)
 47                         hooks = (1 << NF_INET_LOCAL_OUT) |
 48                                 (1 << NF_INET_POST_ROUTING) |
 49                                 (1 << NF_INET_FORWARD);
 50                 else
 51                         hooks = (1 << NF_INET_LOCAL_IN) |
 52                                 (1 << NF_INET_LOCAL_OUT) |
 53                                 (1 << NF_INET_FORWARD) |
 54                                 (1 << NF_INET_PRE_ROUTING) |
 55                                 (1 << NF_INET_POST_ROUTING);
 56 
 57                 break;
 58         default:
 59                 return -EINVAL;
 60         }
 61 
 62         return nft_chain_validate_hooks(ctx->chain, hooks);
 63 }
 64 EXPORT_SYMBOL_GPL(nft_fib_validate);
 65 
 66 int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 67                  const struct nlattr * const tb[])
 68 {
 69         struct nft_fib *priv = nft_expr_priv(expr);
 70         unsigned int len;
 71         int err;
 72 
 73         if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
 74                 return -EINVAL;
 75 
 76         priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
 77 
 78         if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
 79                 return -EINVAL;
 80 
 81         if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
 82                            (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
 83                 return -EINVAL;
 84         if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
 85                            (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
 86                 return -EINVAL;
 87         if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
 88                 return -EINVAL;
 89 
 90         priv->result = ntohl(nla_get_be32(tb[NFTA_FIB_RESULT]));
 91         priv->dreg = nft_parse_register(tb[NFTA_FIB_DREG]);
 92 
 93         switch (priv->result) {
 94         case NFT_FIB_RESULT_OIF:
 95                 if (priv->flags & NFTA_FIB_F_OIF)
 96                         return -EINVAL;
 97                 len = sizeof(int);
 98                 break;
 99         case NFT_FIB_RESULT_OIFNAME:
100                 if (priv->flags & NFTA_FIB_F_OIF)
101                         return -EINVAL;
102                 len = IFNAMSIZ;
103                 break;
104         case NFT_FIB_RESULT_ADDRTYPE:
105                 len = sizeof(u32);
106                 break;
107         default:
108                 return -EINVAL;
109         }
110 
111         err = nft_validate_register_store(ctx, priv->dreg, NULL,
112                                           NFT_DATA_VALUE, len);
113         if (err < 0)
114                 return err;
115 
116         return 0;
117 }
118 EXPORT_SYMBOL_GPL(nft_fib_init);
119 
120 int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr)
121 {
122         const struct nft_fib *priv = nft_expr_priv(expr);
123 
124         if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
125                 return -1;
126 
127         if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
128                 return -1;
129 
130         if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
131                 return -1;
132 
133         return 0;
134 }
135 EXPORT_SYMBOL_GPL(nft_fib_dump);
136 
137 void nft_fib_store_result(void *reg, const struct nft_fib *priv,
138                           const struct nft_pktinfo *pkt, int index)
139 {
140         struct net_device *dev;
141         u32 *dreg = reg;
142 
143         switch (priv->result) {
144         case NFT_FIB_RESULT_OIF:
145                 *dreg = (priv->flags & NFTA_FIB_F_PRESENT) ? !!index : index;
146                 break;
147         case NFT_FIB_RESULT_OIFNAME:
148                 dev = dev_get_by_index_rcu(nft_net(pkt), index);
149                 if (priv->flags & NFTA_FIB_F_PRESENT)
150                         *dreg = !!dev;
151                 else
152                         strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
153                 break;
154         default:
155                 WARN_ON_ONCE(1);
156                 *dreg = 0;
157                 break;
158         }
159 }
160 EXPORT_SYMBOL_GPL(nft_fib_store_result);
161 
162 MODULE_LICENSE("GPL");
163 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
164 

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