1 files changed, 639 insertions, 0 deletions

diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
new file mode 100644
index 000000000000..02996ac05c75
--- /dev/null
+++ b/net/sched/cls_route.c
@@ -0,0 +1,639 @@
+/*
+ * net/sched/cls_route.c        ROUTE4 classifier.
+ *
+ *              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>
+ */
+
+#include <linux/module.h>
+#include <linux/config.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 <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>
+
+/*
+   1. For now we assume that route tags < 256.
+      It allows to use direct table lookups, instead of hash tables.
+   2. For now we assume that "from TAG" and "fromdev DEV" statements
+      are mutually  exclusive.
+   3. "to TAG from ANY" has higher priority, than "to ANY from XXX"
+ */
+
+struct route4_fastmap
+{
+        struct route4_filter    *filter;
+        u32                     id;
+        int                     iif;
+};
+
+struct route4_head
+{
+        struct route4_fastmap   fastmap[16];
+        struct route4_bucket    *table[256+1];
+};
+
+struct route4_bucket
+{
+        /* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */
+        struct route4_filter    *ht[16+16+1];
+};
+
+struct route4_filter
+{
+        struct route4_filter    *next;
+        u32                     id;
+        int                     iif;
+
+        struct tcf_result       res;
+        struct tcf_exts         exts;
+        u32                     handle;
+        struct route4_bucket    *bkt;
+};
+
+#define ROUTE4_FAILURE ((struct route4_filter*)(-1L))
+
+static struct tcf_ext_map route_ext_map = {
+        .police = TCA_ROUTE4_POLICE,
+        .action = TCA_ROUTE4_ACT
+};
+
+static __inline__ int route4_fastmap_hash(u32 id, int iif)
+{
+        return id&0xF;
+}
+
+static inline
+void route4_reset_fastmap(struct net_device *dev, struct route4_head *head, u32 id)
+{
+        spin_lock_bh(&dev->queue_lock);
+        memset(head->fastmap, 0, sizeof(head->fastmap));
+        spin_unlock_bh(&dev->queue_lock);
+}
+
+static void __inline__
+route4_set_fastmap(struct route4_head *head, u32 id, int iif,
+                   struct route4_filter *f)
+{
+        int h = route4_fastmap_hash(id, iif);
+        head->fastmap[h].id = id;
+        head->fastmap[h].iif = iif;
+        head->fastmap[h].filter = f;
+}
+
+static __inline__ int route4_hash_to(u32 id)
+{
+        return id&0xFF;
+}
+
+static __inline__ int route4_hash_from(u32 id)
+{
+        return (id>>16)&0xF;
+}
+
+static __inline__ int route4_hash_iif(int iif)
+{
+        return 16 + ((iif>>16)&0xF);
+}
+
+static __inline__ int route4_hash_wild(void)
+{
+        return 32;
+}
+
+#define ROUTE4_APPLY_RESULT()                                   \
+{                                                               \
+        *res = f->res;                                          \
+        if (tcf_exts_is_available(&f->exts)) {                  \
+                int r = tcf_exts_exec(skb, &f->exts, res);      \
+                if (r < 0) {                                    \
+                        dont_cache = 1;                         \
+                        continue;                               \
+                }                                               \
+                return r;                                       \
+        } else if (!dont_cache)                                 \
+                route4_set_fastmap(head, id, iif, f);           \
+        return 0;                                               \
+}
+
+static int route4_classify(struct sk_buff *skb, struct tcf_proto *tp,
+                           struct tcf_result *res)
+{
+        struct route4_head *head = (struct route4_head*)tp->root;
+        struct dst_entry *dst;
+        struct route4_bucket *b;
+        struct route4_filter *f;
+        u32 id, h;
+        int iif, dont_cache = 0;
+
+        if ((dst = skb->dst) == NULL)
+                goto failure;
+
+        id = dst->tclassid;
+        if (head == NULL)
+                goto old_method;
+
+        iif = ((struct rtable*)dst)->fl.iif;
+
+        h = route4_fastmap_hash(id, iif);
+        if (id == head->fastmap[h].id &&
+            iif == head->fastmap[h].iif &&
+            (f = head->fastmap[h].filter) != NULL) {
+                if (f == ROUTE4_FAILURE)
+                        goto failure;
+
+                *res = f->res;
+                return 0;
+        }
+
+        h = route4_hash_to(id);
+
+restart:
+        if ((b = head->table[h]) != NULL) {
+                for (f = b->ht[route4_hash_from(id)]; f; f = f->next)
+                        if (f->id == id)
+                                ROUTE4_APPLY_RESULT();
+
+                for (f = b->ht[route4_hash_iif(iif)]; f; f = f->next)
+                        if (f->iif == iif)
+                                ROUTE4_APPLY_RESULT();
+
+                for (f = b->ht[route4_hash_wild()]; f; f = f->next)
+                        ROUTE4_APPLY_RESULT();
+
+        }
+        if (h < 256) {
+                h = 256;
+                id &= ~0xFFFF;
+                goto restart;
+        }
+
+        if (!dont_cache)
+                route4_set_fastmap(head, id, iif, ROUTE4_FAILURE);
+failure:
+        return -1;
+
+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 inline u32 to_hash(u32 id)
+{
+        u32 h = id&0xFF;
+        if (id&0x8000)
+                h += 256;
+        return h;
+}
+
+static inline u32 from_hash(u32 id)
+{
+        id &= 0xFFFF;
+        if (id == 0xFFFF)
+                return 32;
+        if (!(id & 0x8000)) {
+                if (id > 255)
+                        return 256;
+                return id&0xF;
+        }
+        return 16 + (id&0xF);
+}
+
+static unsigned long route4_get(struct tcf_proto *tp, u32 handle)
+{
+        struct route4_head *head = (struct route4_head*)tp->root;
+        struct route4_bucket *b;
+        struct route4_filter *f;
+        unsigned h1, h2;
+
+        if (!head)
+                return 0;
+
+        h1 = to_hash(handle);
+        if (h1 > 256)
+                return 0;
+
+        h2 = from_hash(handle>>16);
+        if (h2 > 32)
+                return 0;
+
+        if ((b = head->table[h1]) != NULL) {
+                for (f = b->ht[h2]; f; f = f->next)
+                        if (f->handle == handle)
+                                return (unsigned long)f;
+        }
+        return 0;
+}
+
+static void route4_put(struct tcf_proto *tp, unsigned long f)
+{
+}
+
+static int route4_init(struct tcf_proto *tp)
+{
+        return 0;
+}
+
+static inline void
+route4_delete_filter(struct tcf_proto *tp, struct route4_filter *f)
+{
+        tcf_unbind_filter(tp, &f->res);
+        tcf_exts_destroy(tp, &f->exts);
+        kfree(f);
+}
+
+static void route4_destroy(struct tcf_proto *tp)
+{
+        struct route4_head *head = xchg(&tp->root, NULL);
+        int h1, h2;
+
+        if (head == NULL)
+                return;
+
+        for (h1=0; h1<=256; h1++) {
+                struct route4_bucket *b;
+
+                if ((b = head->table[h1]) != NULL) {
+                        for (h2=0; h2<=32; h2++) {
+                                struct route4_filter *f;
+
+                                while ((f = b->ht[h2]) != NULL) {
+                                        b->ht[h2] = f->next;
+                                        route4_delete_filter(tp, f);
+                                }
+                        }
+                        kfree(b);
+                }
+        }
+        kfree(head);
+}
+
+static int route4_delete(struct tcf_proto *tp, unsigned long arg)
+{
+        struct route4_head *head = (struct route4_head*)tp->root;
+        struct route4_filter **fp, *f = (struct route4_filter*)arg;
+        unsigned h = 0;
+        struct route4_bucket *b;
+        int i;
+
+        if (!head || !f)
+                return -EINVAL;
+
+        h = f->handle;
+        b = f->bkt;
+
+        for (fp = &b->ht[from_hash(h>>16)]; *fp; fp = &(*fp)->next) {
+                if (*fp == f) {
+                        tcf_tree_lock(tp);
+                        *fp = f->next;
+                        tcf_tree_unlock(tp);
+
+                        route4_reset_fastmap(tp->q->dev, head, f->id);
+                        route4_delete_filter(tp, f);
+
+                        /* Strip tree */
+
+                        for (i=0; i<=32; i++)
+                                if (b->ht[i])
+                                        return 0;
+
+                        /* OK, session has no flows */
+                        tcf_tree_lock(tp);
+                        head->table[to_hash(h)] = NULL;
+                        tcf_tree_unlock(tp);
+
+                        kfree(b);
+                        return 0;
+                }
+        }
+        return 0;
+}
+
+static int route4_set_parms(struct tcf_proto *tp, unsigned long base,
+        struct route4_filter *f, u32 handle, struct route4_head *head,
+        struct rtattr **tb, struct rtattr *est, int new)
+{
+        int err;
+        u32 id = 0, to = 0, nhandle = 0x8000;
+        struct route4_filter *fp;
+        unsigned int h1;
+        struct route4_bucket *b;
+        struct tcf_exts e;
+
+        err = tcf_exts_validate(tp, tb, est, &e, &route_ext_map);
+        if (err < 0)
+                return err;
+
+        err = -EINVAL;
+        if (tb[TCA_ROUTE4_CLASSID-1])
+                if (RTA_PAYLOAD(tb[TCA_ROUTE4_CLASSID-1]) < sizeof(u32))
+                        goto errout;
+
+        if (tb[TCA_ROUTE4_TO-1]) {
+                if (new && handle & 0x8000)
+                        goto errout;
+                if (RTA_PAYLOAD(tb[TCA_ROUTE4_TO-1]) < sizeof(u32))
+                        goto errout;
+                to = *(u32*)RTA_DATA(tb[TCA_ROUTE4_TO-1]);
+                if (to > 0xFF)
+                        goto errout;
+                nhandle = to;
+        }
+
+        if (tb[TCA_ROUTE4_FROM-1]) {
+                if (tb[TCA_ROUTE4_IIF-1])
+                        goto errout;
+                if (RTA_PAYLOAD(tb[TCA_ROUTE4_FROM-1]) < sizeof(u32))
+                        goto errout;
+                id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_FROM-1]);
+                if (id > 0xFF)
+                        goto errout;
+                nhandle |= id << 16;
+        } else if (tb[TCA_ROUTE4_IIF-1]) {
+                if (RTA_PAYLOAD(tb[TCA_ROUTE4_IIF-1]) < sizeof(u32))
+                        goto errout;
+                id = *(u32*)RTA_DATA(tb[TCA_ROUTE4_IIF-1]);
+                if (id > 0x7FFF)
+                        goto errout;
+                nhandle |= (id | 0x8000) << 16;
+        } else
+                nhandle |= 0xFFFF << 16;
+
+        if (handle && new) {
+                nhandle |= handle & 0x7F00;
+                if (nhandle != handle)
+                        goto errout;
+        }
+
+        h1 = to_hash(nhandle);
+        if ((b = head->table[h1]) == NULL) {
+                err = -ENOBUFS;
+                b = kmalloc(sizeof(struct route4_bucket), GFP_KERNEL);
+                if (b == NULL)
+                        goto errout;
+                memset(b, 0, sizeof(*b));
+
+                tcf_tree_lock(tp);
+                head->table[h1] = b;
+                tcf_tree_unlock(tp);
+        } else {
+                unsigned int h2 = from_hash(nhandle >> 16);
+                err = -EEXIST;
+                for (fp = b->ht[h2]; fp; fp = fp->next)
+                        if (fp->handle == f->handle)
+                                goto errout;
+        }
+
+        tcf_tree_lock(tp);
+        if (tb[TCA_ROUTE4_TO-1])
+                f->id = to;
+
+        if (tb[TCA_ROUTE4_FROM-1])
+                f->id = to | id<<16;
+        else if (tb[TCA_ROUTE4_IIF-1])
+                f->iif = id;
+
+        f->handle = nhandle;
+        f->bkt = b;
+        tcf_tree_unlock(tp);
+
+        if (tb[TCA_ROUTE4_CLASSID-1]) {
+                f->res.classid = *(u32*)RTA_DATA(tb[TCA_ROUTE4_CLASSID-1]);
+                tcf_bind_filter(tp, &f->res, base);
+        }
+
+        tcf_exts_change(tp, &f->exts, &e);
+
+        return 0;
+errout:
+        tcf_exts_destroy(tp, &e);
+        return err;
+}
+
+static int route4_change(struct tcf_proto *tp, unsigned long base,
+                       u32 handle,
+                       struct rtattr **tca,
+                       unsigned long *arg)
+{
+        struct route4_head *head = tp->root;
+        struct route4_filter *f, *f1, **fp;
+        struct route4_bucket *b;
+        struct rtattr *opt = tca[TCA_OPTIONS-1];
+        struct rtattr *tb[TCA_ROUTE4_MAX];
+        unsigned int h, th;
+        u32 old_handle = 0;
+        int err;
+
+        if (opt == NULL)
+                return handle ? -EINVAL : 0;
+
+        if (rtattr_parse_nested(tb, TCA_ROUTE4_MAX, opt) < 0)
+                return -EINVAL;
+
+        if ((f = (struct route4_filter*)*arg) != NULL) {
+                if (f->handle != handle && handle)
+                        return -EINVAL;
+
+                if (f->bkt)
+                        old_handle = f->handle;
+
+                err = route4_set_parms(tp, base, f, handle, head, tb,
+                        tca[TCA_RATE-1], 0);
+                if (err < 0)
+                        return err;
+
+                goto reinsert;
+        }
+
+        err = -ENOBUFS;
+        if (head == NULL) {
+                head = kmalloc(sizeof(struct route4_head), GFP_KERNEL);
+                if (head == NULL)
+                        goto errout;
+                memset(head, 0, sizeof(struct route4_head));
+
+                tcf_tree_lock(tp);
+                tp->root = head;
+                tcf_tree_unlock(tp);
+        }
+
+        f = kmalloc(sizeof(struct route4_filter), GFP_KERNEL);
+        if (f == NULL)
+                goto errout;
+        memset(f, 0, sizeof(*f));
+
+        err = route4_set_parms(tp, base, f, handle, head, tb,
+                tca[TCA_RATE-1], 1);
+        if (err < 0)
+                goto errout;
+
+reinsert:
+        h = from_hash(f->handle >> 16);
+        for (fp = &f->bkt->ht[h]; (f1=*fp) != NULL; fp = &f1->next)
+                if (f->handle < f1->handle)
+                        break;
+
+        f->next = f1;
+        tcf_tree_lock(tp);
+        *fp = f;
+
+        if (old_handle && f->handle != old_handle) {
+                th = to_hash(old_handle);
+                h = from_hash(old_handle >> 16);
+                if ((b = head->table[th]) != NULL) {
+                        for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) {
+                                if (*fp == f) {
+                                        *fp = f->next;
+                                        break;
+                                }
+                        }
+                }
+        }
+        tcf_tree_unlock(tp);
+
+        route4_reset_fastmap(tp->q->dev, head, f->id);
+        *arg = (unsigned long)f;
+        return 0;
+
+errout:
+        if (f)
+                kfree(f);
+        return err;
+}
+
+static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+        struct route4_head *head = tp->root;
+        unsigned h, h1;
+
+        if (head == NULL)
+                arg->stop = 1;
+
+        if (arg->stop)
+                return;
+
+        for (h = 0; h <= 256; h++) {
+                struct route4_bucket *b = head->table[h];
+
+                if (b) {
+                        for (h1 = 0; h1 <= 32; h1++) {
+                                struct route4_filter *f;
+
+                                for (f = b->ht[h1]; 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 route4_dump(struct tcf_proto *tp, unsigned long fh,
+                       struct sk_buff *skb, struct tcmsg *t)
+{
+        struct route4_filter *f = (struct route4_filter*)fh;
+        unsigned char    *b = skb->tail;
+        struct rtattr *rta;
+        u32 id;
+
+        if (f == NULL)
+                return skb->len;
+
+        t->tcm_handle = f->handle;
+
+        rta = (struct rtattr*)b;
+        RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
+
+        if (!(f->handle&0x8000)) {
+                id = f->id&0xFF;
+                RTA_PUT(skb, TCA_ROUTE4_TO, sizeof(id), &id);
+        }
+        if (f->handle&0x80000000) {
+                if ((f->handle>>16) != 0xFFFF)
+                        RTA_PUT(skb, TCA_ROUTE4_IIF, sizeof(f->iif), &f->iif);
+        } else {
+                id = f->id>>16;
+                RTA_PUT(skb, TCA_ROUTE4_FROM, sizeof(id), &id);
+        }
+        if (f->res.classid)
+                RTA_PUT(skb, TCA_ROUTE4_CLASSID, 4, &f->res.classid);
+
+        if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0)
+                goto rtattr_failure;
+
+        rta->rta_len = skb->tail - b;
+
+        if (tcf_exts_dump_stats(skb, &f->exts, &route_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_route4_ops = {
+        .next           =       NULL,
+        .kind           =       "route",
+        .classify       =       route4_classify,
+        .init           =       route4_init,
+        .destroy        =       route4_destroy,
+        .get            =       route4_get,
+        .put            =       route4_put,
+        .change         =       route4_change,
+        .delete         =       route4_delete,
+        .walk           =       route4_walk,
+        .dump           =       route4_dump,
+        .owner          =       THIS_MODULE,
+};
+
+static int __init init_route4(void)
+{
+        return register_tcf_proto_ops(&cls_route4_ops);
+}
+
+static void __exit exit_route4(void)
+{
+        unregister_tcf_proto_ops(&cls_route4_ops);
+}
+
+module_init(init_route4)
+module_exit(exit_route4)
+MODULE_LICENSE("GPL");