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@@ -0,0 +1,157 @@
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+/*
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+ * net/sched/em_text.c Textsearch 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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+
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+#include <linux/config.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/sched.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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+
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+struct text_match
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+{
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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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+
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+#define EM_TEXT_PRIV(m) ((struct text_match *) (m)->data)
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+
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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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+ struct ts_state state;
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+
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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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+
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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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+
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+ return skb_find_text(skb, from, to, tm->config, &state) != UINT_MAX;
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+}
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+
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+static int em_text_change(struct tcf_proto *tp, 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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+
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+ printk("Configuring text: %s from %d:%d to %d:%d len %d\n", conf->algo, conf->from_offset,
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+ conf->from_layer, conf->to_offset, conf->to_layer, conf->pattern_len);
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+
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+ if (len < sizeof(*conf) || len < (sizeof(*conf) + conf->pattern_len))
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+ return -EINVAL;
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+
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+ if (conf->from_layer > conf->to_layer)
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+ return -EINVAL;
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+
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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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+
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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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+
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+ if (flags & TS_AUTOLOAD)
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+ rtnl_lock();
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+
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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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+
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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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+
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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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+
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+ m->datalen = sizeof(*tm);
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+ m->data = (unsigned long) tm;
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+
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+ return 0;
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+}
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+
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+static void em_text_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
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+{
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+ textsearch_destroy(EM_TEXT_PRIV(m)->config);
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+}
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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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+
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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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+
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+ RTA_PUT_NOHDR(skb, sizeof(conf), &conf);
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+ RTA_APPEND(skb, conf.pattern_len, textsearch_get_pattern(tm->config));
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+ return 0;
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+
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+rtattr_failure:
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+ return -1;
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+}
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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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+
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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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+
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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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+
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+MODULE_LICENSE("GPL");
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+
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+module_init(init_em_text);
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+module_exit(exit_em_text);
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