1 files changed, 378 insertions, 0 deletions

diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
new file mode 100644
index 000000000000..fdfc83af3d1f
--- /dev/null
+++ b/net/sched/cls_fw.c
@@ -0,0 +1,378 @@
+/*
+ * net/sched/cls_fw.c   Classifier mapping ipchains' fwmark to traffic class.
+ *
+ *              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.
+ *
+ * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * Changes:
+ * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
+ * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
+ * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
+ *
+ * JHS: We should remove the CONFIG_NET_CLS_IND from here
+ * eventually when the meta match extension is made available
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/if_ether.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/notifier.h>
+#include <linux/netfilter.h>
+#include <net/ip.h>
+#include <net/route.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/act_api.h>
+#include <net/pkt_cls.h>
+
+struct fw_head
+{
+        struct fw_filter *ht[256];
+};
+
+struct fw_filter
+{
+        struct fw_filter        *next;
+        u32                     id;
+        struct tcf_result       res;
+#ifdef CONFIG_NET_CLS_IND
+        char                    indev[IFNAMSIZ];
+#endif /* CONFIG_NET_CLS_IND */
+        struct tcf_exts         exts;
+};
+
+static struct tcf_ext_map fw_ext_map = {
+        .action = TCA_FW_ACT,
+        .police = TCA_FW_POLICE
+};
+
+static __inline__ int fw_hash(u32 handle)
+{
+        return handle&0xFF;
+}
+
+static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp,
+                          struct tcf_result *res)
+{
+        struct fw_head *head = (struct fw_head*)tp->root;
+        struct fw_filter *f;
+        int r;
+#ifdef CONFIG_NETFILTER
+        u32 id = skb->nfmark;
+#else
+        u32 id = 0;
+#endif
+
+        if (head != NULL) {
+                for (f=head->ht[fw_hash(id)]; f; f=f->next) {
+                        if (f->id == id) {
+                                *res = f->res;
+#ifdef CONFIG_NET_CLS_IND
+                                if (!tcf_match_indev(skb, f->indev))
+                                        continue;
+#endif /* CONFIG_NET_CLS_IND */
+                                r = tcf_exts_exec(skb, &f->exts, res);
+                                if (r < 0)
+                                        continue;
+
+                                return r;
+                        }
+                }
+        } else {
+                /* old method */
+                if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) {
+                        res->classid = id;
+                        res->class = 0;
+                        return 0;
+                }
+        }
+
+        return -1;
+}
+
+static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
+{
+        struct fw_head *head = (struct fw_head*)tp->root;
+        struct fw_filter *f;
+
+        if (head == NULL)
+                return 0;
+
+        for (f=head->ht[fw_hash(handle)]; f; f=f->next) {
+                if (f->id == handle)
+                        return (unsigned long)f;
+        }
+        return 0;
+}
+
+static void fw_put(struct tcf_proto *tp, unsigned long f)
+{
+}
+
+static int fw_init(struct tcf_proto *tp)
+{
+        return 0;
+}
+
+static inline void
+fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
+{
+        tcf_unbind_filter(tp, &f->res);
+        tcf_exts_destroy(tp, &f->exts);
+        kfree(f);
+}
+
+static void fw_destroy(struct tcf_proto *tp)
+{
+        struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL);
+        struct fw_filter *f;
+        int h;
+
+        if (head == NULL)
+                return;
+
+        for (h=0; h<256; h++) {
+                while ((f=head->ht[h]) != NULL) {
+                        head->ht[h] = f->next;
+                        fw_delete_filter(tp, f);
+                }
+        }
+        kfree(head);
+}
+
+static int fw_delete(struct tcf_proto *tp, unsigned long arg)
+{
+        struct fw_head *head = (struct fw_head*)tp->root;
+        struct fw_filter *f = (struct fw_filter*)arg;
+        struct fw_filter **fp;
+
+        if (head == NULL || f == NULL)
+                goto out;
+
+        for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
+                if (*fp == f) {
+                        tcf_tree_lock(tp);
+                        *fp = f->next;
+                        tcf_tree_unlock(tp);
+                        fw_delete_filter(tp, f);
+                        return 0;
+                }
+        }
+out:
+        return -EINVAL;
+}
+
+static int
+fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
+        struct rtattr **tb, struct rtattr **tca, unsigned long base)
+{
+        struct tcf_exts e;
+        int err;
+
+        err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map);
+        if (err < 0)
+                return err;
+
+        err = -EINVAL;
+        if (tb[TCA_FW_CLASSID-1]) {
+                if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32))
+                        goto errout;
+                f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]);
+                tcf_bind_filter(tp, &f->res, base);
+        }
+
+#ifdef CONFIG_NET_CLS_IND
+        if (tb[TCA_FW_INDEV-1]) {
+                err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]);
+                if (err < 0)
+                        goto errout;
+        }
+#endif /* CONFIG_NET_CLS_IND */
+
+        tcf_exts_change(tp, &f->exts, &e);
+
+        return 0;
+errout:
+        tcf_exts_destroy(tp, &e);
+        return err;
+}
+
+static int fw_change(struct tcf_proto *tp, unsigned long base,
+                     u32 handle,
+                     struct rtattr **tca,
+                     unsigned long *arg)
+{
+        struct fw_head *head = (struct fw_head*)tp->root;
+        struct fw_filter *f = (struct fw_filter *) *arg;
+        struct rtattr *opt = tca[TCA_OPTIONS-1];
+        struct rtattr *tb[TCA_FW_MAX];
+        int err;
+
+        if (!opt)
+                return handle ? -EINVAL : 0;
+
+        if (rtattr_parse_nested(tb, TCA_FW_MAX, opt) < 0)
+                return -EINVAL;
+
+        if (f != NULL) {
+                if (f->id != handle && handle)
+                        return -EINVAL;
+                return fw_change_attrs(tp, f, tb, tca, base);
+        }
+
+        if (!handle)
+                return -EINVAL;
+
+        if (head == NULL) {
+                head = kmalloc(sizeof(struct fw_head), GFP_KERNEL);
+                if (head == NULL)
+                        return -ENOBUFS;
+                memset(head, 0, sizeof(*head));
+
+                tcf_tree_lock(tp);
+                tp->root = head;
+                tcf_tree_unlock(tp);
+        }
+
+        f = kmalloc(sizeof(struct fw_filter), GFP_KERNEL);
+        if (f == NULL)
+                return -ENOBUFS;
+        memset(f, 0, sizeof(*f));
+
+        f->id = handle;
+
+        err = fw_change_attrs(tp, f, tb, tca, base);
+        if (err < 0)
+                goto errout;
+
+        f->next = head->ht[fw_hash(handle)];
+        tcf_tree_lock(tp);
+        head->ht[fw_hash(handle)] = f;
+        tcf_tree_unlock(tp);
+
+        *arg = (unsigned long)f;
+        return 0;
+
+errout:
+        if (f)
+                kfree(f);
+        return err;
+}
+
+static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+        struct fw_head *head = (struct fw_head*)tp->root;
+        int h;
+
+        if (head == NULL)
+                arg->stop = 1;
+
+        if (arg->stop)
+                return;
+
+        for (h = 0; h < 256; h++) {
+                struct fw_filter *f;
+
+                for (f = head->ht[h]; f; f = f->next) {
+                        if (arg->count < arg->skip) {
+                                arg->count++;
+                                continue;
+                        }
+                        if (arg->fn(tp, (unsigned long)f, arg) < 0) {
+                                arg->stop = 1;
+                                return;
+                        }
+                        arg->count++;
+                }
+        }
+}
+
+static int fw_dump(struct tcf_proto *tp, unsigned long fh,
+                   struct sk_buff *skb, struct tcmsg *t)
+{
+        struct fw_filter *f = (struct fw_filter*)fh;
+        unsigned char    *b = skb->tail;
+        struct rtattr *rta;
+
+        if (f == NULL)
+                return skb->len;
+
+        t->tcm_handle = f->id;
+
+        if (!f->res.classid && !tcf_exts_is_available(&f->exts))
+                return skb->len;
+
+        rta = (struct rtattr*)b;
+        RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
+
+        if (f->res.classid)
+                RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid);
+#ifdef CONFIG_NET_CLS_IND
+        if (strlen(f->indev))
+                RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev);
+#endif /* CONFIG_NET_CLS_IND */
+
+        if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
+                goto rtattr_failure;
+
+        rta->rta_len = skb->tail - b;
+
+        if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
+                goto rtattr_failure;
+
+        return skb->len;
+
+rtattr_failure:
+        skb_trim(skb, b - skb->data);
+        return -1;
+}
+
+static struct tcf_proto_ops cls_fw_ops = {
+        .next           =       NULL,
+        .kind           =       "fw",
+        .classify       =       fw_classify,
+        .init           =       fw_init,
+        .destroy        =       fw_destroy,
+        .get            =       fw_get,
+        .put            =       fw_put,
+        .change         =       fw_change,
+        .delete         =       fw_delete,
+        .walk           =       fw_walk,
+        .dump           =       fw_dump,
+        .owner          =       THIS_MODULE,
+};
+
+static int __init init_fw(void)
+{
+        return register_tcf_proto_ops(&cls_fw_ops);
+}
+
+static void __exit exit_fw(void) 
+{
+        unregister_tcf_proto_ops(&cls_fw_ops);
+}
+
+module_init(init_fw)
+module_exit(exit_fw)
+MODULE_LICENSE("GPL");