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

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  1 /*
  2  * Copyright (c) 2008-2009 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/module.h>
 14 #include <linux/netlink.h>
 15 #include <linux/netfilter.h>
 16 #include <linux/netfilter/nf_tables.h>
 17 #include <net/netfilter/nf_tables_core.h>
 18 #include <net/netfilter/nf_tables.h>
 19 
 20 struct nft_cmp_expr {
 21         struct nft_data         data;
 22         enum nft_registers      sreg:8;
 23         u8                      len;
 24         enum nft_cmp_ops        op:8;
 25 };
 26 
 27 static void nft_cmp_eval(const struct nft_expr *expr,
 28                          struct nft_regs *regs,
 29                          const struct nft_pktinfo *pkt)
 30 {
 31         const struct nft_cmp_expr *priv = nft_expr_priv(expr);
 32         int d;
 33 
 34         d = memcmp(&regs->data[priv->sreg], &priv->data, priv->len);
 35         switch (priv->op) {
 36         case NFT_CMP_EQ:
 37                 if (d != 0)
 38                         goto mismatch;
 39                 break;
 40         case NFT_CMP_NEQ:
 41                 if (d == 0)
 42                         goto mismatch;
 43                 break;
 44         case NFT_CMP_LT:
 45                 if (d == 0)
 46                         goto mismatch;
 47         case NFT_CMP_LTE:
 48                 if (d > 0)
 49                         goto mismatch;
 50                 break;
 51         case NFT_CMP_GT:
 52                 if (d == 0)
 53                         goto mismatch;
 54         case NFT_CMP_GTE:
 55                 if (d < 0)
 56                         goto mismatch;
 57                 break;
 58         }
 59         return;
 60 
 61 mismatch:
 62         regs->verdict.code = NFT_BREAK;
 63 }
 64 
 65 static const struct nla_policy nft_cmp_policy[NFTA_CMP_MAX + 1] = {
 66         [NFTA_CMP_SREG]         = { .type = NLA_U32 },
 67         [NFTA_CMP_OP]           = { .type = NLA_U32 },
 68         [NFTA_CMP_DATA]         = { .type = NLA_NESTED },
 69 };
 70 
 71 static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 72                         const struct nlattr * const tb[])
 73 {
 74         struct nft_cmp_expr *priv = nft_expr_priv(expr);
 75         struct nft_data_desc desc;
 76         int err;
 77 
 78         err = nft_data_init(NULL, &priv->data, sizeof(priv->data), &desc,
 79                             tb[NFTA_CMP_DATA]);
 80         BUG_ON(err < 0);
 81 
 82         priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
 83         err = nft_validate_register_load(priv->sreg, desc.len);
 84         if (err < 0)
 85                 return err;
 86 
 87         priv->op  = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
 88         priv->len = desc.len;
 89         return 0;
 90 }
 91 
 92 static int nft_cmp_dump(struct sk_buff *skb, const struct nft_expr *expr)
 93 {
 94         const struct nft_cmp_expr *priv = nft_expr_priv(expr);
 95 
 96         if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
 97                 goto nla_put_failure;
 98         if (nla_put_be32(skb, NFTA_CMP_OP, htonl(priv->op)))
 99                 goto nla_put_failure;
100 
101         if (nft_data_dump(skb, NFTA_CMP_DATA, &priv->data,
102                           NFT_DATA_VALUE, priv->len) < 0)
103                 goto nla_put_failure;
104         return 0;
105 
106 nla_put_failure:
107         return -1;
108 }
109 
110 static struct nft_expr_type nft_cmp_type;
111 static const struct nft_expr_ops nft_cmp_ops = {
112         .type           = &nft_cmp_type,
113         .size           = NFT_EXPR_SIZE(sizeof(struct nft_cmp_expr)),
114         .eval           = nft_cmp_eval,
115         .init           = nft_cmp_init,
116         .dump           = nft_cmp_dump,
117 };
118 
119 static int nft_cmp_fast_init(const struct nft_ctx *ctx,
120                              const struct nft_expr *expr,
121                              const struct nlattr * const tb[])
122 {
123         struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
124         struct nft_data_desc desc;
125         struct nft_data data;
126         u32 mask;
127         int err;
128 
129         err = nft_data_init(NULL, &data, sizeof(data), &desc,
130                             tb[NFTA_CMP_DATA]);
131         BUG_ON(err < 0);
132 
133         priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
134         err = nft_validate_register_load(priv->sreg, desc.len);
135         if (err < 0)
136                 return err;
137 
138         desc.len *= BITS_PER_BYTE;
139         mask = nft_cmp_fast_mask(desc.len);
140 
141         priv->data = data.data[0] & mask;
142         priv->len  = desc.len;
143         return 0;
144 }
145 
146 static int nft_cmp_fast_dump(struct sk_buff *skb, const struct nft_expr *expr)
147 {
148         const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
149         struct nft_data data;
150 
151         if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
152                 goto nla_put_failure;
153         if (nla_put_be32(skb, NFTA_CMP_OP, htonl(NFT_CMP_EQ)))
154                 goto nla_put_failure;
155 
156         data.data[0] = priv->data;
157         if (nft_data_dump(skb, NFTA_CMP_DATA, &data,
158                           NFT_DATA_VALUE, priv->len / BITS_PER_BYTE) < 0)
159                 goto nla_put_failure;
160         return 0;
161 
162 nla_put_failure:
163         return -1;
164 }
165 
166 const struct nft_expr_ops nft_cmp_fast_ops = {
167         .type           = &nft_cmp_type,
168         .size           = NFT_EXPR_SIZE(sizeof(struct nft_cmp_fast_expr)),
169         .eval           = NULL, /* inlined */
170         .init           = nft_cmp_fast_init,
171         .dump           = nft_cmp_fast_dump,
172 };
173 
174 static const struct nft_expr_ops *
175 nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
176 {
177         struct nft_data_desc desc;
178         struct nft_data data;
179         enum nft_cmp_ops op;
180         int err;
181 
182         if (tb[NFTA_CMP_SREG] == NULL ||
183             tb[NFTA_CMP_OP] == NULL ||
184             tb[NFTA_CMP_DATA] == NULL)
185                 return ERR_PTR(-EINVAL);
186 
187         op = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
188         switch (op) {
189         case NFT_CMP_EQ:
190         case NFT_CMP_NEQ:
191         case NFT_CMP_LT:
192         case NFT_CMP_LTE:
193         case NFT_CMP_GT:
194         case NFT_CMP_GTE:
195                 break;
196         default:
197                 return ERR_PTR(-EINVAL);
198         }
199 
200         err = nft_data_init(NULL, &data, sizeof(data), &desc,
201                             tb[NFTA_CMP_DATA]);
202         if (err < 0)
203                 return ERR_PTR(err);
204 
205         if (desc.len <= sizeof(u32) && op == NFT_CMP_EQ)
206                 return &nft_cmp_fast_ops;
207         else
208                 return &nft_cmp_ops;
209 }
210 
211 static struct nft_expr_type nft_cmp_type __read_mostly = {
212         .name           = "cmp",
213         .select_ops     = nft_cmp_select_ops,
214         .policy         = nft_cmp_policy,
215         .maxattr        = NFTA_CMP_MAX,
216         .owner          = THIS_MODULE,
217 };
218 
219 int __init nft_cmp_module_init(void)
220 {
221         return nft_register_expr(&nft_cmp_type);
222 }
223 
224 void nft_cmp_module_exit(void)
225 {
226         nft_unregister_expr(&nft_cmp_type);
227 }
228 

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