mirror of
https://github.com/torvalds/linux
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82a470f111
This removes the tcf_proto argument from the ematch code paths that only need it to reference the net namespace. This allows simplifying qdisc code paths especially when we need to tear down the ematch from an RCU callback. In this case we can not guarentee that the tcf_proto structure is still valid. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Acked-by: Cong Wang <cwang@twopensource.com> Signed-off-by: David S. Miller <davem@davemloft.net>
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* net/sched/em_nbyte.c N-Byte ematch
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*/
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#include <linux/gfp.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <linux/tc_ematch/tc_em_nbyte.h>
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#include <net/pkt_cls.h>
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struct nbyte_data {
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struct tcf_em_nbyte hdr;
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char pattern[0];
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};
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static int em_nbyte_change(struct net *net, void *data, int data_len,
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struct tcf_ematch *em)
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{
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struct tcf_em_nbyte *nbyte = data;
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if (data_len < sizeof(*nbyte) ||
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data_len < (sizeof(*nbyte) + nbyte->len))
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return -EINVAL;
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em->datalen = sizeof(*nbyte) + nbyte->len;
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em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
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if (em->data == 0UL)
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return -ENOBUFS;
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return 0;
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}
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static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
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struct tcf_pkt_info *info)
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{
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struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
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unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);
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ptr += nbyte->hdr.off;
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if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
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return 0;
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return !memcmp(ptr + nbyte->hdr.off, nbyte->pattern, nbyte->hdr.len);
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}
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static struct tcf_ematch_ops em_nbyte_ops = {
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.kind = TCF_EM_NBYTE,
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.change = em_nbyte_change,
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.match = em_nbyte_match,
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.owner = THIS_MODULE,
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.link = LIST_HEAD_INIT(em_nbyte_ops.link)
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};
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static int __init init_em_nbyte(void)
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{
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return tcf_em_register(&em_nbyte_ops);
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}
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static void __exit exit_em_nbyte(void)
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{
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tcf_em_unregister(&em_nbyte_ops);
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}
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MODULE_LICENSE("GPL");
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module_init(init_em_nbyte);
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module_exit(exit_em_nbyte);
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MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);
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