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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 | /* * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Development of this code funded by Astaro AG (http://www.astaro.com/) */ #include <linux/kernel.h> #include <linux/init.h> #include <linux/module.h> #include <linux/netlink.h> #include <linux/netfilter.h> #include <linux/netfilter/nf_tables.h> #include <net/netfilter/nf_tables_core.h> #include <net/netfilter/nf_tables.h> struct nft_byteorder { enum nft_registers sreg:8; enum nft_registers dreg:8; enum nft_byteorder_ops op:8; u8 len; u8 size; }; static void nft_byteorder_eval(const struct nft_expr *expr, struct nft_data data[NFT_REG_MAX + 1], const struct nft_pktinfo *pkt) { const struct nft_byteorder *priv = nft_expr_priv(expr); struct nft_data *src = &data[priv->sreg], *dst = &data[priv->dreg]; union { u32 u32; u16 u16; } *s, *d; unsigned int i; s = (void *)src->data; d = (void *)dst->data; switch (priv->size) { case 4: switch (priv->op) { case NFT_BYTEORDER_NTOH: for (i = 0; i < priv->len / 4; i++) d[i].u32 = ntohl((__force __be32)s[i].u32); break; case NFT_BYTEORDER_HTON: for (i = 0; i < priv->len / 4; i++) d[i].u32 = (__force __u32)htonl(s[i].u32); break; } break; case 2: switch (priv->op) { case NFT_BYTEORDER_NTOH: for (i = 0; i < priv->len / 2; i++) d[i].u16 = ntohs((__force __be16)s[i].u16); break; case NFT_BYTEORDER_HTON: for (i = 0; i < priv->len / 2; i++) d[i].u16 = (__force __u16)htons(s[i].u16); break; } break; } } static const struct nla_policy nft_byteorder_policy[NFTA_BYTEORDER_MAX + 1] = { [NFTA_BYTEORDER_SREG] = { .type = NLA_U32 }, [NFTA_BYTEORDER_DREG] = { .type = NLA_U32 }, [NFTA_BYTEORDER_OP] = { .type = NLA_U32 }, [NFTA_BYTEORDER_LEN] = { .type = NLA_U32 }, [NFTA_BYTEORDER_SIZE] = { .type = NLA_U32 }, }; static int nft_byteorder_init(const struct nft_ctx *ctx, const struct nft_expr *expr, const struct nlattr * const tb[]) { struct nft_byteorder *priv = nft_expr_priv(expr); int err; if (tb[NFTA_BYTEORDER_SREG] == NULL || tb[NFTA_BYTEORDER_DREG] == NULL || tb[NFTA_BYTEORDER_LEN] == NULL || tb[NFTA_BYTEORDER_SIZE] == NULL || tb[NFTA_BYTEORDER_OP] == NULL) return -EINVAL; priv->sreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SREG])); err = nft_validate_input_register(priv->sreg); if (err < 0) return err; priv->dreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_DREG])); err = nft_validate_output_register(priv->dreg); if (err < 0) return err; err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE); if (err < 0) return err; priv->op = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_OP])); switch (priv->op) { case NFT_BYTEORDER_NTOH: case NFT_BYTEORDER_HTON: break; default: return -EINVAL; } priv->len = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN])); if (priv->len == 0 || priv->len > FIELD_SIZEOF(struct nft_data, data)) return -EINVAL; priv->size = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SIZE])); switch (priv->size) { case 2: case 4: break; default: return -EINVAL; } return 0; } static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr) { const struct nft_byteorder *priv = nft_expr_priv(expr); if (nla_put_be32(skb, NFTA_BYTEORDER_SREG, htonl(priv->sreg))) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BYTEORDER_DREG, htonl(priv->dreg))) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BYTEORDER_OP, htonl(priv->op))) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BYTEORDER_LEN, htonl(priv->len))) goto nla_put_failure; if (nla_put_be32(skb, NFTA_BYTEORDER_SIZE, htonl(priv->size))) goto nla_put_failure; return 0; nla_put_failure: return -1; } static struct nft_expr_type nft_byteorder_type; static const struct nft_expr_ops nft_byteorder_ops = { .type = &nft_byteorder_type, .size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)), .eval = nft_byteorder_eval, .init = nft_byteorder_init, .dump = nft_byteorder_dump, }; static struct nft_expr_type nft_byteorder_type __read_mostly = { .name = "byteorder", .ops = &nft_byteorder_ops, .policy = nft_byteorder_policy, .maxattr = NFTA_BYTEORDER_MAX, .owner = THIS_MODULE, }; int __init nft_byteorder_module_init(void) { return nft_register_expr(&nft_byteorder_type); } void nft_byteorder_module_exit(void) { nft_unregister_expr(&nft_byteorder_type); } |