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

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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_data data[NFT_REG_MAX + 1],
 29                          const struct nft_pktinfo *pkt)
 30 {
 31         const struct nft_cmp_expr *priv = nft_expr_priv(expr);
 32         int d;
 33 
 34         d = nft_data_cmp(&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         data[NFT_REG_VERDICT].verdict = 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         priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
 79         priv->op = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
 80 
 81         err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_CMP_DATA]);
 82         BUG_ON(err < 0);
 83 
 84         priv->len = desc.len;
 85         return 0;
 86 }
 87 
 88 static int nft_cmp_dump(struct sk_buff *skb, const struct nft_expr *expr)
 89 {
 90         const struct nft_cmp_expr *priv = nft_expr_priv(expr);
 91 
 92         if (nla_put_be32(skb, NFTA_CMP_SREG, htonl(priv->sreg)))
 93                 goto nla_put_failure;
 94         if (nla_put_be32(skb, NFTA_CMP_OP, htonl(priv->op)))
 95                 goto nla_put_failure;
 96 
 97         if (nft_data_dump(skb, NFTA_CMP_DATA, &priv->data,
 98                           NFT_DATA_VALUE, priv->len) < 0)
 99                 goto nla_put_failure;
100         return 0;
101 
102 nla_put_failure:
103         return -1;
104 }
105 
106 static struct nft_expr_type nft_cmp_type;
107 static const struct nft_expr_ops nft_cmp_ops = {
108         .type           = &nft_cmp_type,
109         .size           = NFT_EXPR_SIZE(sizeof(struct nft_cmp_expr)),
110         .eval           = nft_cmp_eval,
111         .init           = nft_cmp_init,
112         .dump           = nft_cmp_dump,
113 };
114 
115 static int nft_cmp_fast_init(const struct nft_ctx *ctx,
116                              const struct nft_expr *expr,
117                              const struct nlattr * const tb[])
118 {
119         struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
120         struct nft_data_desc desc;
121         struct nft_data data;
122         u32 mask;
123         int err;
124 
125         priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
126 
127         err = nft_data_init(NULL, &data, &desc, tb[NFTA_CMP_DATA]);
128         BUG_ON(err < 0);
129         desc.len *= BITS_PER_BYTE;
130 
131         mask = nft_cmp_fast_mask(desc.len);
132         priv->data = data.data[0] & mask;
133         priv->len  = desc.len;
134         return 0;
135 }
136 
137 static int nft_cmp_fast_dump(struct sk_buff *skb, const struct nft_expr *expr)
138 {
139         const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
140         struct nft_data data;
141 
142         if (nla_put_be32(skb, NFTA_CMP_SREG, htonl(priv->sreg)))
143                 goto nla_put_failure;
144         if (nla_put_be32(skb, NFTA_CMP_OP, htonl(NFT_CMP_EQ)))
145                 goto nla_put_failure;
146 
147         data.data[0] = priv->data;
148         if (nft_data_dump(skb, NFTA_CMP_DATA, &data,
149                           NFT_DATA_VALUE, priv->len / BITS_PER_BYTE) < 0)
150                 goto nla_put_failure;
151         return 0;
152 
153 nla_put_failure:
154         return -1;
155 }
156 
157 const struct nft_expr_ops nft_cmp_fast_ops = {
158         .type           = &nft_cmp_type,
159         .size           = NFT_EXPR_SIZE(sizeof(struct nft_cmp_fast_expr)),
160         .eval           = NULL, /* inlined */
161         .init           = nft_cmp_fast_init,
162         .dump           = nft_cmp_fast_dump,
163 };
164 
165 static const struct nft_expr_ops *
166 nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
167 {
168         struct nft_data_desc desc;
169         struct nft_data data;
170         enum nft_registers sreg;
171         enum nft_cmp_ops op;
172         int err;
173 
174         if (tb[NFTA_CMP_SREG] == NULL ||
175             tb[NFTA_CMP_OP] == NULL ||
176             tb[NFTA_CMP_DATA] == NULL)
177                 return ERR_PTR(-EINVAL);
178 
179         sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
180         err = nft_validate_input_register(sreg);
181         if (err < 0)
182                 return ERR_PTR(err);
183 
184         op = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
185         switch (op) {
186         case NFT_CMP_EQ:
187         case NFT_CMP_NEQ:
188         case NFT_CMP_LT:
189         case NFT_CMP_LTE:
190         case NFT_CMP_GT:
191         case NFT_CMP_GTE:
192                 break;
193         default:
194                 return ERR_PTR(-EINVAL);
195         }
196 
197         err = nft_data_init(NULL, &data, &desc, tb[NFTA_CMP_DATA]);
198         if (err < 0)
199                 return ERR_PTR(err);
200 
201         if (desc.len <= sizeof(u32) && op == NFT_CMP_EQ)
202                 return &nft_cmp_fast_ops;
203         else
204                 return &nft_cmp_ops;
205 }
206 
207 static struct nft_expr_type nft_cmp_type __read_mostly = {
208         .name           = "cmp",
209         .select_ops     = nft_cmp_select_ops,
210         .policy         = nft_cmp_policy,
211         .maxattr        = NFTA_CMP_MAX,
212         .owner          = THIS_MODULE,
213 };
214 
215 int __init nft_cmp_module_init(void)
216 {
217         return nft_register_expr(&nft_cmp_type);
218 }
219 
220 void nft_cmp_module_exit(void)
221 {
222         nft_unregister_expr(&nft_cmp_type);
223 }
224 

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