linux/net/sched/em_nbyte.c
Breno Leitao a46c31bf27 net: fill in MODULE_DESCRIPTION()s for net/sched
W=1 builds now warn if module is built without a MODULE_DESCRIPTION().
Add descriptions to the network schedulers.

Suggested-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Link: https://lore.kernel.org/r/20240208164244.3818498-8-leitao@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-02-09 14:12:02 -08:00

78 lines
1.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* net/sched/em_nbyte.c N-Byte ematch
*
* Authors: Thomas Graf <tgraf@suug.ch>
*/
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/tc_ematch/tc_em_nbyte.h>
#include <net/pkt_cls.h>
struct nbyte_data {
struct tcf_em_nbyte hdr;
char pattern[];
};
static int em_nbyte_change(struct net *net, void *data, int data_len,
struct tcf_ematch *em)
{
struct tcf_em_nbyte *nbyte = data;
if (data_len < sizeof(*nbyte) ||
data_len < (sizeof(*nbyte) + nbyte->len))
return -EINVAL;
em->datalen = sizeof(*nbyte) + nbyte->len;
em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
if (em->data == 0UL)
return -ENOMEM;
return 0;
}
static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
struct tcf_pkt_info *info)
{
struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);
ptr += nbyte->hdr.off;
if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
return 0;
return !memcmp(ptr, nbyte->pattern, nbyte->hdr.len);
}
static struct tcf_ematch_ops em_nbyte_ops = {
.kind = TCF_EM_NBYTE,
.change = em_nbyte_change,
.match = em_nbyte_match,
.owner = THIS_MODULE,
.link = LIST_HEAD_INIT(em_nbyte_ops.link)
};
static int __init init_em_nbyte(void)
{
return tcf_em_register(&em_nbyte_ops);
}
static void __exit exit_em_nbyte(void)
{
tcf_em_unregister(&em_nbyte_ops);
}
MODULE_DESCRIPTION("ematch classifier for arbitrary skb multi-bytes");
MODULE_LICENSE("GPL");
module_init(init_em_nbyte);
module_exit(exit_em_nbyte);
MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);