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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
153 lines
3.4 KiB
C
153 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/em_text.c Textsearch ematch
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*/
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#include <linux/slab.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/textsearch.h>
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#include <linux/tc_ematch/tc_em_text.h>
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#include <net/pkt_cls.h>
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struct text_match {
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u16 from_offset;
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u16 to_offset;
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u8 from_layer;
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u8 to_layer;
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struct ts_config *config;
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};
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#define EM_TEXT_PRIV(m) ((struct text_match *) (m)->data)
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static int em_text_match(struct sk_buff *skb, struct tcf_ematch *m,
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struct tcf_pkt_info *info)
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{
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struct text_match *tm = EM_TEXT_PRIV(m);
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int from, to;
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from = tcf_get_base_ptr(skb, tm->from_layer) - skb->data;
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from += tm->from_offset;
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to = tcf_get_base_ptr(skb, tm->to_layer) - skb->data;
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to += tm->to_offset;
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return skb_find_text(skb, from, to, tm->config) != UINT_MAX;
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}
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static int em_text_change(struct net *net, void *data, int len,
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struct tcf_ematch *m)
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{
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struct text_match *tm;
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struct tcf_em_text *conf = data;
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struct ts_config *ts_conf;
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int flags = 0;
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if (len < sizeof(*conf) || len < (sizeof(*conf) + conf->pattern_len))
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return -EINVAL;
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if (conf->from_layer > conf->to_layer)
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return -EINVAL;
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if (conf->from_layer == conf->to_layer &&
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conf->from_offset > conf->to_offset)
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return -EINVAL;
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retry:
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ts_conf = textsearch_prepare(conf->algo, (u8 *) conf + sizeof(*conf),
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conf->pattern_len, GFP_KERNEL, flags);
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if (flags & TS_AUTOLOAD)
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rtnl_lock();
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if (IS_ERR(ts_conf)) {
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if (PTR_ERR(ts_conf) == -ENOENT && !(flags & TS_AUTOLOAD)) {
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rtnl_unlock();
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flags |= TS_AUTOLOAD;
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goto retry;
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} else
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return PTR_ERR(ts_conf);
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} else if (flags & TS_AUTOLOAD) {
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textsearch_destroy(ts_conf);
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return -EAGAIN;
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}
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tm = kmalloc(sizeof(*tm), GFP_KERNEL);
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if (tm == NULL) {
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textsearch_destroy(ts_conf);
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return -ENOBUFS;
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}
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tm->from_offset = conf->from_offset;
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tm->to_offset = conf->to_offset;
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tm->from_layer = conf->from_layer;
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tm->to_layer = conf->to_layer;
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tm->config = ts_conf;
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m->datalen = sizeof(*tm);
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m->data = (unsigned long) tm;
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return 0;
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}
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static void em_text_destroy(struct tcf_ematch *m)
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{
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if (EM_TEXT_PRIV(m) && EM_TEXT_PRIV(m)->config)
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textsearch_destroy(EM_TEXT_PRIV(m)->config);
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}
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static int em_text_dump(struct sk_buff *skb, struct tcf_ematch *m)
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{
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struct text_match *tm = EM_TEXT_PRIV(m);
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struct tcf_em_text conf;
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strncpy(conf.algo, tm->config->ops->name, sizeof(conf.algo) - 1);
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conf.from_offset = tm->from_offset;
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conf.to_offset = tm->to_offset;
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conf.from_layer = tm->from_layer;
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conf.to_layer = tm->to_layer;
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conf.pattern_len = textsearch_get_pattern_len(tm->config);
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conf.pad = 0;
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if (nla_put_nohdr(skb, sizeof(conf), &conf) < 0)
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goto nla_put_failure;
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if (nla_append(skb, conf.pattern_len,
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textsearch_get_pattern(tm->config)) < 0)
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static struct tcf_ematch_ops em_text_ops = {
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.kind = TCF_EM_TEXT,
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.change = em_text_change,
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.match = em_text_match,
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.destroy = em_text_destroy,
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.dump = em_text_dump,
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.owner = THIS_MODULE,
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.link = LIST_HEAD_INIT(em_text_ops.link)
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};
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static int __init init_em_text(void)
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{
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return tcf_em_register(&em_text_ops);
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}
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static void __exit exit_em_text(void)
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{
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tcf_em_unregister(&em_text_ops);
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}
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MODULE_LICENSE("GPL");
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module_init(init_em_text);
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module_exit(exit_em_text);
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MODULE_ALIAS_TCF_EMATCH(TCF_EM_TEXT);
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