![Thomas Gleixner](/assets/img/avatar_default.png)
Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <net/ip.h>
|
|
#include <net/tcp.h>
|
|
|
|
#include <net/netfilter/nf_tables.h>
|
|
#include <linux/netfilter/nfnetlink_osf.h>
|
|
|
|
struct nft_osf {
|
|
enum nft_registers dreg:8;
|
|
u8 ttl;
|
|
u32 flags;
|
|
};
|
|
|
|
static const struct nla_policy nft_osf_policy[NFTA_OSF_MAX + 1] = {
|
|
[NFTA_OSF_DREG] = { .type = NLA_U32 },
|
|
[NFTA_OSF_TTL] = { .type = NLA_U8 },
|
|
[NFTA_OSF_FLAGS] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static void nft_osf_eval(const struct nft_expr *expr, struct nft_regs *regs,
|
|
const struct nft_pktinfo *pkt)
|
|
{
|
|
struct nft_osf *priv = nft_expr_priv(expr);
|
|
u32 *dest = ®s->data[priv->dreg];
|
|
struct sk_buff *skb = pkt->skb;
|
|
char os_match[NFT_OSF_MAXGENRELEN + 1];
|
|
const struct tcphdr *tcp;
|
|
struct nf_osf_data data;
|
|
struct tcphdr _tcph;
|
|
|
|
tcp = skb_header_pointer(skb, ip_hdrlen(skb),
|
|
sizeof(struct tcphdr), &_tcph);
|
|
if (!tcp) {
|
|
regs->verdict.code = NFT_BREAK;
|
|
return;
|
|
}
|
|
if (!tcp->syn) {
|
|
regs->verdict.code = NFT_BREAK;
|
|
return;
|
|
}
|
|
|
|
if (!nf_osf_find(skb, nf_osf_fingers, priv->ttl, &data)) {
|
|
strncpy((char *)dest, "unknown", NFT_OSF_MAXGENRELEN);
|
|
} else {
|
|
if (priv->flags & NFT_OSF_F_VERSION)
|
|
snprintf(os_match, NFT_OSF_MAXGENRELEN, "%s:%s",
|
|
data.genre, data.version);
|
|
else
|
|
strlcpy(os_match, data.genre, NFT_OSF_MAXGENRELEN);
|
|
|
|
strncpy((char *)dest, os_match, NFT_OSF_MAXGENRELEN);
|
|
}
|
|
}
|
|
|
|
static int nft_osf_init(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nlattr * const tb[])
|
|
{
|
|
struct nft_osf *priv = nft_expr_priv(expr);
|
|
u32 flags;
|
|
int err;
|
|
u8 ttl;
|
|
|
|
if (tb[NFTA_OSF_TTL]) {
|
|
ttl = nla_get_u8(tb[NFTA_OSF_TTL]);
|
|
if (ttl > 2)
|
|
return -EINVAL;
|
|
priv->ttl = ttl;
|
|
}
|
|
|
|
if (tb[NFTA_OSF_FLAGS]) {
|
|
flags = ntohl(nla_get_be32(tb[NFTA_OSF_FLAGS]));
|
|
if (flags != NFT_OSF_F_VERSION)
|
|
return -EINVAL;
|
|
priv->flags = flags;
|
|
}
|
|
|
|
priv->dreg = nft_parse_register(tb[NFTA_OSF_DREG]);
|
|
err = nft_validate_register_store(ctx, priv->dreg, NULL,
|
|
NFT_DATA_VALUE, NFT_OSF_MAXGENRELEN);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nft_osf_dump(struct sk_buff *skb, const struct nft_expr *expr)
|
|
{
|
|
const struct nft_osf *priv = nft_expr_priv(expr);
|
|
|
|
if (nla_put_u8(skb, NFTA_OSF_TTL, priv->ttl))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_be32(skb, NFTA_OSF_FLAGS, ntohl(priv->flags)))
|
|
goto nla_put_failure;
|
|
|
|
if (nft_dump_register(skb, NFTA_OSF_DREG, priv->dreg))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
static int nft_osf_validate(const struct nft_ctx *ctx,
|
|
const struct nft_expr *expr,
|
|
const struct nft_data **data)
|
|
{
|
|
return nft_chain_validate_hooks(ctx->chain, (1 << NF_INET_LOCAL_IN) |
|
|
(1 << NF_INET_PRE_ROUTING) |
|
|
(1 << NF_INET_FORWARD));
|
|
}
|
|
|
|
static struct nft_expr_type nft_osf_type;
|
|
static const struct nft_expr_ops nft_osf_op = {
|
|
.eval = nft_osf_eval,
|
|
.size = NFT_EXPR_SIZE(sizeof(struct nft_osf)),
|
|
.init = nft_osf_init,
|
|
.dump = nft_osf_dump,
|
|
.type = &nft_osf_type,
|
|
.validate = nft_osf_validate,
|
|
};
|
|
|
|
static struct nft_expr_type nft_osf_type __read_mostly = {
|
|
.ops = &nft_osf_op,
|
|
.name = "osf",
|
|
.owner = THIS_MODULE,
|
|
.policy = nft_osf_policy,
|
|
.maxattr = NFTA_OSF_MAX,
|
|
};
|
|
|
|
static int __init nft_osf_module_init(void)
|
|
{
|
|
return nft_register_expr(&nft_osf_type);
|
|
}
|
|
|
|
static void __exit nft_osf_module_exit(void)
|
|
{
|
|
return nft_unregister_expr(&nft_osf_type);
|
|
}
|
|
|
|
module_init(nft_osf_module_init);
|
|
module_exit(nft_osf_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Fernando Fernandez <ffmancera@riseup.net>");
|
|
MODULE_ALIAS_NFT_EXPR("osf");
|