1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
5 * Development of this code funded by Astaro AG (http://www.astaro.com/)
8 #include <asm/unaligned.h>
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>
18 struct nft_byteorder {
19 enum nft_registers sreg:8;
20 enum nft_registers dreg:8;
21 enum nft_byteorder_ops op:8;
26 void nft_byteorder_eval(const struct nft_expr *expr,
27 struct nft_regs *regs,
28 const struct nft_pktinfo *pkt)
30 const struct nft_byteorder *priv = nft_expr_priv(expr);
31 u32 *src = ®s->data[priv->sreg];
32 u32 *dst = ®s->data[priv->dreg];
33 union { u32 u32; u16 u16; } *s, *d;
44 case NFT_BYTEORDER_NTOH:
45 for (i = 0; i < priv->len / 8; i++) {
46 src64 = get_unaligned((u64 *)&src[i]);
47 put_unaligned_be64(src64, &dst[i]);
50 case NFT_BYTEORDER_HTON:
51 for (i = 0; i < priv->len / 8; i++) {
52 src64 = get_unaligned_be64(&src[i]);
53 put_unaligned(src64, (u64 *)&dst[i]);
61 case NFT_BYTEORDER_NTOH:
62 for (i = 0; i < priv->len / 4; i++)
63 d[i].u32 = ntohl((__force __be32)s[i].u32);
65 case NFT_BYTEORDER_HTON:
66 for (i = 0; i < priv->len / 4; i++)
67 d[i].u32 = (__force __u32)htonl(s[i].u32);
73 case NFT_BYTEORDER_NTOH:
74 for (i = 0; i < priv->len / 2; i++)
75 d[i].u16 = ntohs((__force __be16)s[i].u16);
77 case NFT_BYTEORDER_HTON:
78 for (i = 0; i < priv->len / 2; i++)
79 d[i].u16 = (__force __u16)htons(s[i].u16);
86 static const struct nla_policy nft_byteorder_policy[NFTA_BYTEORDER_MAX + 1] = {
87 [NFTA_BYTEORDER_SREG] = { .type = NLA_U32 },
88 [NFTA_BYTEORDER_DREG] = { .type = NLA_U32 },
89 [NFTA_BYTEORDER_OP] = { .type = NLA_U32 },
90 [NFTA_BYTEORDER_LEN] = { .type = NLA_U32 },
91 [NFTA_BYTEORDER_SIZE] = { .type = NLA_U32 },
94 static int nft_byteorder_init(const struct nft_ctx *ctx,
95 const struct nft_expr *expr,
96 const struct nlattr * const tb[])
98 struct nft_byteorder *priv = nft_expr_priv(expr);
102 if (tb[NFTA_BYTEORDER_SREG] == NULL ||
103 tb[NFTA_BYTEORDER_DREG] == NULL ||
104 tb[NFTA_BYTEORDER_LEN] == NULL ||
105 tb[NFTA_BYTEORDER_SIZE] == NULL ||
106 tb[NFTA_BYTEORDER_OP] == NULL)
109 priv->op = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_OP]));
111 case NFT_BYTEORDER_NTOH:
112 case NFT_BYTEORDER_HTON:
118 err = nft_parse_u32_check(tb[NFTA_BYTEORDER_SIZE], U8_MAX, &size);
124 switch (priv->size) {
133 priv->sreg = nft_parse_register(tb[NFTA_BYTEORDER_SREG]);
134 err = nft_parse_u32_check(tb[NFTA_BYTEORDER_LEN], U8_MAX, &len);
140 err = nft_validate_register_load(priv->sreg, priv->len);
144 priv->dreg = nft_parse_register(tb[NFTA_BYTEORDER_DREG]);
145 return nft_validate_register_store(ctx, priv->dreg, NULL,
146 NFT_DATA_VALUE, priv->len);
149 static int nft_byteorder_dump(struct sk_buff *skb, const struct nft_expr *expr)
151 const struct nft_byteorder *priv = nft_expr_priv(expr);
153 if (nft_dump_register(skb, NFTA_BYTEORDER_SREG, priv->sreg))
154 goto nla_put_failure;
155 if (nft_dump_register(skb, NFTA_BYTEORDER_DREG, priv->dreg))
156 goto nla_put_failure;
157 if (nla_put_be32(skb, NFTA_BYTEORDER_OP, htonl(priv->op)))
158 goto nla_put_failure;
159 if (nla_put_be32(skb, NFTA_BYTEORDER_LEN, htonl(priv->len)))
160 goto nla_put_failure;
161 if (nla_put_be32(skb, NFTA_BYTEORDER_SIZE, htonl(priv->size)))
162 goto nla_put_failure;
169 static const struct nft_expr_ops nft_byteorder_ops = {
170 .type = &nft_byteorder_type,
171 .size = NFT_EXPR_SIZE(sizeof(struct nft_byteorder)),
172 .eval = nft_byteorder_eval,
173 .init = nft_byteorder_init,
174 .dump = nft_byteorder_dump,
177 struct nft_expr_type nft_byteorder_type __read_mostly = {
179 .ops = &nft_byteorder_ops,
180 .policy = nft_byteorder_policy,
181 .maxattr = NFTA_BYTEORDER_MAX,
182 .owner = THIS_MODULE,