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

Version: ~ [ linux-5.13-rc5 ] ~ [ linux-5.12.9 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.42 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.124 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.193 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.235 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.271 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.271 ] ~ [ 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_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                 /* fall through */
 48         case NFT_CMP_LTE:
 49                 if (d > 0)
 50                         goto mismatch;
 51                 break;
 52         case NFT_CMP_GT:
 53                 if (d == 0)
 54                         goto mismatch;
 55                 /* fall through */
 56         case NFT_CMP_GTE:
 57                 if (d < 0)
 58                         goto mismatch;
 59                 break;
 60         }
 61         return;
 62 
 63 mismatch:
 64         regs->verdict.code = NFT_BREAK;
 65 }
 66 
 67 static const struct nla_policy nft_cmp_policy[NFTA_CMP_MAX + 1] = {
 68         [NFTA_CMP_SREG]         = { .type = NLA_U32 },
 69         [NFTA_CMP_OP]           = { .type = NLA_U32 },
 70         [NFTA_CMP_DATA]         = { .type = NLA_NESTED },
 71 };
 72 
 73 static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
 74                         const struct nlattr * const tb[])
 75 {
 76         struct nft_cmp_expr *priv = nft_expr_priv(expr);
 77         struct nft_data_desc desc;
 78         int err;
 79 
 80         err = nft_data_init(NULL, &priv->data, sizeof(priv->data), &desc,
 81                             tb[NFTA_CMP_DATA]);
 82         BUG_ON(err < 0);
 83 
 84         priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
 85         err = nft_validate_register_load(priv->sreg, desc.len);
 86         if (err < 0)
 87                 return err;
 88 
 89         priv->op  = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
 90         priv->len = desc.len;
 91         return 0;
 92 }
 93 
 94 static int nft_cmp_dump(struct sk_buff *skb, const struct nft_expr *expr)
 95 {
 96         const struct nft_cmp_expr *priv = nft_expr_priv(expr);
 97 
 98         if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
 99                 goto nla_put_failure;
100         if (nla_put_be32(skb, NFTA_CMP_OP, htonl(priv->op)))
101                 goto nla_put_failure;
102 
103         if (nft_data_dump(skb, NFTA_CMP_DATA, &priv->data,
104                           NFT_DATA_VALUE, priv->len) < 0)
105                 goto nla_put_failure;
106         return 0;
107 
108 nla_put_failure:
109         return -1;
110 }
111 
112 static const struct nft_expr_ops nft_cmp_ops = {
113         .type           = &nft_cmp_type,
114         .size           = NFT_EXPR_SIZE(sizeof(struct nft_cmp_expr)),
115         .eval           = nft_cmp_eval,
116         .init           = nft_cmp_init,
117         .dump           = nft_cmp_dump,
118 };
119 
120 static int nft_cmp_fast_init(const struct nft_ctx *ctx,
121                              const struct nft_expr *expr,
122                              const struct nlattr * const tb[])
123 {
124         struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
125         struct nft_data_desc desc;
126         struct nft_data data;
127         u32 mask;
128         int err;
129 
130         err = nft_data_init(NULL, &data, sizeof(data), &desc,
131                             tb[NFTA_CMP_DATA]);
132         BUG_ON(err < 0);
133 
134         priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
135         err = nft_validate_register_load(priv->sreg, desc.len);
136         if (err < 0)
137                 return err;
138 
139         desc.len *= BITS_PER_BYTE;
140         mask = nft_cmp_fast_mask(desc.len);
141 
142         priv->data = data.data[0] & mask;
143         priv->len  = desc.len;
144         return 0;
145 }
146 
147 static int nft_cmp_fast_dump(struct sk_buff *skb, const struct nft_expr *expr)
148 {
149         const struct nft_cmp_fast_expr *priv = nft_expr_priv(expr);
150         struct nft_data data;
151 
152         if (nft_dump_register(skb, NFTA_CMP_SREG, priv->sreg))
153                 goto nla_put_failure;
154         if (nla_put_be32(skb, NFTA_CMP_OP, htonl(NFT_CMP_EQ)))
155                 goto nla_put_failure;
156 
157         data.data[0] = priv->data;
158         if (nft_data_dump(skb, NFTA_CMP_DATA, &data,
159                           NFT_DATA_VALUE, priv->len / BITS_PER_BYTE) < 0)
160                 goto nla_put_failure;
161         return 0;
162 
163 nla_put_failure:
164         return -1;
165 }
166 
167 const struct nft_expr_ops nft_cmp_fast_ops = {
168         .type           = &nft_cmp_type,
169         .size           = NFT_EXPR_SIZE(sizeof(struct nft_cmp_fast_expr)),
170         .eval           = NULL, /* inlined */
171         .init           = nft_cmp_fast_init,
172         .dump           = nft_cmp_fast_dump,
173 };
174 
175 static const struct nft_expr_ops *
176 nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
177 {
178         struct nft_data_desc desc;
179         struct nft_data data;
180         enum nft_cmp_ops op;
181         int err;
182 
183         if (tb[NFTA_CMP_SREG] == NULL ||
184             tb[NFTA_CMP_OP] == NULL ||
185             tb[NFTA_CMP_DATA] == NULL)
186                 return ERR_PTR(-EINVAL);
187 
188         op = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
189         switch (op) {
190         case NFT_CMP_EQ:
191         case NFT_CMP_NEQ:
192         case NFT_CMP_LT:
193         case NFT_CMP_LTE:
194         case NFT_CMP_GT:
195         case NFT_CMP_GTE:
196                 break;
197         default:
198                 return ERR_PTR(-EINVAL);
199         }
200 
201         err = nft_data_init(NULL, &data, sizeof(data), &desc,
202                             tb[NFTA_CMP_DATA]);
203         if (err < 0)
204                 return ERR_PTR(err);
205 
206         if (desc.type != NFT_DATA_VALUE) {
207                 err = -EINVAL;
208                 goto err1;
209         }
210 
211         if (desc.len <= sizeof(u32) && op == NFT_CMP_EQ)
212                 return &nft_cmp_fast_ops;
213 
214         return &nft_cmp_ops;
215 err1:
216         nft_data_release(&data, desc.type);
217         return ERR_PTR(-EINVAL);
218 }
219 
220 struct nft_expr_type nft_cmp_type __read_mostly = {
221         .name           = "cmp",
222         .select_ops     = nft_cmp_select_ops,
223         .policy         = nft_cmp_policy,
224         .maxattr        = NFTA_CMP_MAX,
225         .owner          = THIS_MODULE,
226 };
227 

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