1 files changed, 642 insertions, 0 deletions

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
new file mode 100644
index 000000000000..56e66c3fe0fa
--- /dev/null
+++ b/net/sched/cls_api.c
@@ -0,0 +1,642 @@
+/*
+ * net/sched/cls_api.c  Packet classifier API.
+ *
+ *              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:
+ *
+ * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
+ *
+ */
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/bitops.h>
+#include <linux/config.h>
+#include <linux/module.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/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/init.h>
+#include <linux/kmod.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+
+#if 0 /* control */
+#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
+#else
+#define DPRINTK(format,args...)
+#endif
+
+/* The list of all installed classifier types */
+
+static struct tcf_proto_ops *tcf_proto_base;
+
+/* Protects list of registered TC modules. It is pure SMP lock. */
+static DEFINE_RWLOCK(cls_mod_lock);
+
+/* Find classifier type by string name */
+
+static struct tcf_proto_ops * tcf_proto_lookup_ops(struct rtattr *kind)
+{
+        struct tcf_proto_ops *t = NULL;
+
+        if (kind) {
+                read_lock(&cls_mod_lock);
+                for (t = tcf_proto_base; t; t = t->next) {
+                        if (rtattr_strcmp(kind, t->kind) == 0) {
+                                if (!try_module_get(t->owner))
+                                        t = NULL;
+                                break;
+                        }
+                }
+                read_unlock(&cls_mod_lock);
+        }
+        return t;
+}
+
+/* Register(unregister) new classifier type */
+
+int register_tcf_proto_ops(struct tcf_proto_ops *ops)
+{
+        struct tcf_proto_ops *t, **tp;
+        int rc = -EEXIST;
+
+        write_lock(&cls_mod_lock);
+        for (tp = &tcf_proto_base; (t = *tp) != NULL; tp = &t->next)
+                if (!strcmp(ops->kind, t->kind))
+                        goto out;
+
+        ops->next = NULL;
+        *tp = ops;
+        rc = 0;
+out:
+        write_unlock(&cls_mod_lock);
+        return rc;
+}
+
+int unregister_tcf_proto_ops(struct tcf_proto_ops *ops)
+{
+        struct tcf_proto_ops *t, **tp;
+        int rc = -ENOENT;
+
+        write_lock(&cls_mod_lock);
+        for (tp = &tcf_proto_base; (t=*tp) != NULL; tp = &t->next)
+                if (t == ops)
+                        break;
+
+        if (!t)
+                goto out;
+        *tp = t->next;
+        rc = 0;
+out:
+        write_unlock(&cls_mod_lock);
+        return rc;
+}
+
+static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
+                          struct tcf_proto *tp, unsigned long fh, int event);
+
+
+/* Select new prio value from the range, managed by kernel. */
+
+static __inline__ u32 tcf_auto_prio(struct tcf_proto *tp)
+{
+        u32 first = TC_H_MAKE(0xC0000000U,0U);
+
+        if (tp)
+                first = tp->prio-1;
+
+        return first;
+}
+
+/* Add/change/delete/get a filter node */
+
+static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n, void *arg)
+{
+        struct rtattr **tca;
+        struct tcmsg *t;
+        u32 protocol;
+        u32 prio;
+        u32 nprio;
+        u32 parent;
+        struct net_device *dev;
+        struct Qdisc  *q;
+        struct tcf_proto **back, **chain;
+        struct tcf_proto *tp;
+        struct tcf_proto_ops *tp_ops;
+        struct Qdisc_class_ops *cops;
+        unsigned long cl;
+        unsigned long fh;
+        int err;
+
+replay:
+        tca = arg;
+        t = NLMSG_DATA(n);
+        protocol = TC_H_MIN(t->tcm_info);
+        prio = TC_H_MAJ(t->tcm_info);
+        nprio = prio;
+        parent = t->tcm_parent;
+        cl = 0;
+
+        if (prio == 0) {
+                /* If no priority is given, user wants we allocated it. */
+                if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
+                        return -ENOENT;
+                prio = TC_H_MAKE(0x80000000U,0U);
+        }
+
+        /* Find head of filter chain. */
+
+        /* Find link */
+        if ((dev = __dev_get_by_index(t->tcm_ifindex)) == NULL)
+                return -ENODEV;
+
+        /* Find qdisc */
+        if (!parent) {
+                q = dev->qdisc_sleeping;
+                parent = q->handle;
+        } else if ((q = qdisc_lookup(dev, TC_H_MAJ(t->tcm_parent))) == NULL)
+                return -EINVAL;
+
+        /* Is it classful? */
+        if ((cops = q->ops->cl_ops) == NULL)
+                return -EINVAL;
+
+        /* Do we search for filter, attached to class? */
+        if (TC_H_MIN(parent)) {
+                cl = cops->get(q, parent);
+                if (cl == 0)
+                        return -ENOENT;
+        }
+
+        /* And the last stroke */
+        chain = cops->tcf_chain(q, cl);
+        err = -EINVAL;
+        if (chain == NULL)
+                goto errout;
+
+        /* Check the chain for existence of proto-tcf with this priority */
+        for (back = chain; (tp=*back) != NULL; back = &tp->next) {
+                if (tp->prio >= prio) {
+                        if (tp->prio == prio) {
+                                if (!nprio || (tp->protocol != protocol && protocol))
+                                        goto errout;
+                        } else
+                                tp = NULL;
+                        break;
+                }
+        }
+
+        if (tp == NULL) {
+                /* Proto-tcf does not exist, create new one */
+
+                if (tca[TCA_KIND-1] == NULL || !protocol)
+                        goto errout;
+
+                err = -ENOENT;
+                if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
+                        goto errout;
+
+
+                /* Create new proto tcf */
+
+                err = -ENOBUFS;
+                if ((tp = kmalloc(sizeof(*tp), GFP_KERNEL)) == NULL)
+                        goto errout;
+                err = -EINVAL;
+                tp_ops = tcf_proto_lookup_ops(tca[TCA_KIND-1]);
+                if (tp_ops == NULL) {
+#ifdef CONFIG_KMOD
+                        struct rtattr *kind = tca[TCA_KIND-1];
+                        char name[IFNAMSIZ];
+
+                        if (kind != NULL &&
+                            rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
+                                rtnl_unlock();
+                                request_module("cls_%s", name);
+                                rtnl_lock();
+                                tp_ops = tcf_proto_lookup_ops(kind);
+                                /* We dropped the RTNL semaphore in order to
+                                 * perform the module load.  So, even if we
+                                 * succeeded in loading the module we have to
+                                 * replay the request.  We indicate this using
+                                 * -EAGAIN.
+                                 */
+                                if (tp_ops != NULL) {
+                                        module_put(tp_ops->owner);
+                                        err = -EAGAIN;
+                                }
+                        }
+#endif
+                        kfree(tp);
+                        goto errout;
+                }
+                memset(tp, 0, sizeof(*tp));
+                tp->ops = tp_ops;
+                tp->protocol = protocol;
+                tp->prio = nprio ? : tcf_auto_prio(*back);
+                tp->q = q;
+                tp->classify = tp_ops->classify;
+                tp->classid = parent;
+                if ((err = tp_ops->init(tp)) != 0) {
+                        module_put(tp_ops->owner);
+                        kfree(tp);
+                        goto errout;
+                }
+
+                qdisc_lock_tree(dev);
+                tp->next = *back;
+                *back = tp;
+                qdisc_unlock_tree(dev);
+
+        } else if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], tp->ops->kind))
+                goto errout;
+
+        fh = tp->ops->get(tp, t->tcm_handle);
+
+        if (fh == 0) {
+                if (n->nlmsg_type == RTM_DELTFILTER && t->tcm_handle == 0) {
+                        qdisc_lock_tree(dev);
+                        *back = tp->next;
+                        qdisc_unlock_tree(dev);
+
+                        tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
+                        tcf_destroy(tp);
+                        err = 0;
+                        goto errout;
+                }
+
+                err = -ENOENT;
+                if (n->nlmsg_type != RTM_NEWTFILTER || !(n->nlmsg_flags&NLM_F_CREATE))
+                        goto errout;
+        } else {
+                switch (n->nlmsg_type) {
+                case RTM_NEWTFILTER:    
+                        err = -EEXIST;
+                        if (n->nlmsg_flags&NLM_F_EXCL)
+                                goto errout;
+                        break;
+                case RTM_DELTFILTER:
+                        err = tp->ops->delete(tp, fh);
+                        if (err == 0)
+                                tfilter_notify(skb, n, tp, fh, RTM_DELTFILTER);
+                        goto errout;
+                case RTM_GETTFILTER:
+                        err = tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
+                        goto errout;
+                default:
+                        err = -EINVAL;
+                        goto errout;
+                }
+        }
+
+        err = tp->ops->change(tp, cl, t->tcm_handle, tca, &fh);
+        if (err == 0)
+                tfilter_notify(skb, n, tp, fh, RTM_NEWTFILTER);
+
+errout:
+        if (cl)
+                cops->put(q, cl);
+        if (err == -EAGAIN)
+                /* Replay the request. */
+                goto replay;
+        return err;
+}
+
+static int
+tcf_fill_node(struct sk_buff *skb, struct tcf_proto *tp, unsigned long fh,
+              u32 pid, u32 seq, unsigned flags, int event)
+{
+        struct tcmsg *tcm;
+        struct nlmsghdr  *nlh;
+        unsigned char    *b = skb->tail;
+
+        nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*tcm));
+        nlh->nlmsg_flags = flags;
+        tcm = NLMSG_DATA(nlh);
+        tcm->tcm_family = AF_UNSPEC;
+        tcm->tcm_ifindex = tp->q->dev->ifindex;
+        tcm->tcm_parent = tp->classid;
+        tcm->tcm_info = TC_H_MAKE(tp->prio, tp->protocol);
+        RTA_PUT(skb, TCA_KIND, IFNAMSIZ, tp->ops->kind);
+        tcm->tcm_handle = fh;
+        if (RTM_DELTFILTER != event) {
+                tcm->tcm_handle = 0;
+                if (tp->ops->dump && tp->ops->dump(tp, fh, skb, tcm) < 0)
+                        goto rtattr_failure;
+        }
+        nlh->nlmsg_len = skb->tail - b;
+        return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+        skb_trim(skb, b - skb->data);
+        return -1;
+}
+
+static int tfilter_notify(struct sk_buff *oskb, struct nlmsghdr *n,
+                          struct tcf_proto *tp, unsigned long fh, int event)
+{
+        struct sk_buff *skb;
+        u32 pid = oskb ? NETLINK_CB(oskb).pid : 0;
+
+        skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+        if (!skb)
+                return -ENOBUFS;
+
+        if (tcf_fill_node(skb, tp, fh, pid, n->nlmsg_seq, 0, event) <= 0) {
+                kfree_skb(skb);
+                return -EINVAL;
+        }
+
+        return rtnetlink_send(skb, pid, RTMGRP_TC, n->nlmsg_flags&NLM_F_ECHO);
+}
+
+struct tcf_dump_args
+{
+        struct tcf_walker w;
+        struct sk_buff *skb;
+        struct netlink_callback *cb;
+};
+
+static int tcf_node_dump(struct tcf_proto *tp, unsigned long n, struct tcf_walker *arg)
+{
+        struct tcf_dump_args *a = (void*)arg;
+
+        return tcf_fill_node(a->skb, tp, n, NETLINK_CB(a->cb->skb).pid,
+                             a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER);
+}
+
+static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
+{
+        int t;
+        int s_t;
+        struct net_device *dev;
+        struct Qdisc *q;
+        struct tcf_proto *tp, **chain;
+        struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh);
+        unsigned long cl = 0;
+        struct Qdisc_class_ops *cops;
+        struct tcf_dump_args arg;
+
+        if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm)))
+                return skb->len;
+        if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL)
+                return skb->len;
+
+        read_lock_bh(&qdisc_tree_lock);
+        if (!tcm->tcm_parent)
+                q = dev->qdisc_sleeping;
+        else
+                q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
+        if (!q)
+                goto out;
+        if ((cops = q->ops->cl_ops) == NULL)
+                goto errout;
+        if (TC_H_MIN(tcm->tcm_parent)) {
+                cl = cops->get(q, tcm->tcm_parent);
+                if (cl == 0)
+                        goto errout;
+        }
+        chain = cops->tcf_chain(q, cl);
+        if (chain == NULL)
+                goto errout;
+
+        s_t = cb->args[0];
+
+        for (tp=*chain, t=0; tp; tp = tp->next, t++) {
+                if (t < s_t) continue;
+                if (TC_H_MAJ(tcm->tcm_info) &&
+                    TC_H_MAJ(tcm->tcm_info) != tp->prio)
+                        continue;
+                if (TC_H_MIN(tcm->tcm_info) &&
+                    TC_H_MIN(tcm->tcm_info) != tp->protocol)
+                        continue;
+                if (t > s_t)
+                        memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
+                if (cb->args[1] == 0) {
+                        if (tcf_fill_node(skb, tp, 0, NETLINK_CB(cb->skb).pid,
+                                          cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTFILTER) <= 0) {
+                                break;
+                        }
+                        cb->args[1] = 1;
+                }
+                if (tp->ops->walk == NULL)
+                        continue;
+                arg.w.fn = tcf_node_dump;
+                arg.skb = skb;
+                arg.cb = cb;
+                arg.w.stop = 0;
+                arg.w.skip = cb->args[1]-1;
+                arg.w.count = 0;
+                tp->ops->walk(tp, &arg.w);
+                cb->args[1] = arg.w.count+1;
+                if (arg.w.stop)
+                        break;
+        }
+
+        cb->args[0] = t;
+
+errout:
+        if (cl)
+                cops->put(q, cl);
+out:
+        read_unlock_bh(&qdisc_tree_lock);
+        dev_put(dev);
+        return skb->len;
+}
+
+void
+tcf_exts_destroy(struct tcf_proto *tp, struct tcf_exts *exts)
+{
+#ifdef CONFIG_NET_CLS_ACT
+        if (exts->action) {
+                tcf_action_destroy(exts->action, TCA_ACT_UNBIND);
+                exts->action = NULL;
+        }
+#elif defined CONFIG_NET_CLS_POLICE
+        if (exts->police) {
+                tcf_police_release(exts->police, TCA_ACT_UNBIND);
+                exts->police = NULL;
+        }
+#endif
+}
+
+
+int
+tcf_exts_validate(struct tcf_proto *tp, struct rtattr **tb,
+                  struct rtattr *rate_tlv, struct tcf_exts *exts,
+                  struct tcf_ext_map *map)
+{
+        memset(exts, 0, sizeof(*exts));
+        
+#ifdef CONFIG_NET_CLS_ACT
+        {
+                int err;
+                struct tc_action *act;
+
+                if (map->police && tb[map->police-1]) {
+                        act = tcf_action_init_1(tb[map->police-1], rate_tlv, "police",
+                                TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err);
+                        if (act == NULL)
+                                return err;
+
+                        act->type = TCA_OLD_COMPAT;
+                        exts->action = act;
+                } else if (map->action && tb[map->action-1]) {
+                        act = tcf_action_init(tb[map->action-1], rate_tlv, NULL,
+                                TCA_ACT_NOREPLACE, TCA_ACT_BIND, &err);
+                        if (act == NULL)
+                                return err;
+
+                        exts->action = act;
+                }
+        }
+#elif defined CONFIG_NET_CLS_POLICE
+        if (map->police && tb[map->police-1]) {
+                struct tcf_police *p;
+                
+                p = tcf_police_locate(tb[map->police-1], rate_tlv);
+                if (p == NULL)
+                        return -EINVAL;
+
+                exts->police = p;
+        } else if (map->action && tb[map->action-1])
+                return -EOPNOTSUPP;
+#else
+        if ((map->action && tb[map->action-1]) ||
+            (map->police && tb[map->police-1]))
+                return -EOPNOTSUPP;
+#endif
+
+        return 0;
+}
+
+void
+tcf_exts_change(struct tcf_proto *tp, struct tcf_exts *dst,
+                struct tcf_exts *src)
+{
+#ifdef CONFIG_NET_CLS_ACT
+        if (src->action) {
+                struct tc_action *act;
+                tcf_tree_lock(tp);
+                act = xchg(&dst->action, src->action);
+                tcf_tree_unlock(tp);
+                if (act)
+                        tcf_action_destroy(act, TCA_ACT_UNBIND);
+        }
+#elif defined CONFIG_NET_CLS_POLICE
+        if (src->police) {
+                struct tcf_police *p;
+                tcf_tree_lock(tp);
+                p = xchg(&dst->police, src->police);
+                tcf_tree_unlock(tp);
+                if (p)
+                        tcf_police_release(p, TCA_ACT_UNBIND);
+        }
+#endif
+}
+
+int
+tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts,
+              struct tcf_ext_map *map)
+{
+#ifdef CONFIG_NET_CLS_ACT
+        if (map->action && exts->action) {
+                /*
+                 * again for backward compatible mode - we want
+                 * to work with both old and new modes of entering
+                 * tc data even if iproute2  was newer - jhs
+                 */
+                struct rtattr * p_rta = (struct rtattr*) skb->tail;
+
+                if (exts->action->type != TCA_OLD_COMPAT) {
+                        RTA_PUT(skb, map->action, 0, NULL);
+                        if (tcf_action_dump(skb, exts->action, 0, 0) < 0)
+                                goto rtattr_failure;
+                        p_rta->rta_len = skb->tail - (u8*)p_rta;
+                } else if (map->police) {
+                        RTA_PUT(skb, map->police, 0, NULL);
+                        if (tcf_action_dump_old(skb, exts->action, 0, 0) < 0)
+                                goto rtattr_failure;
+                        p_rta->rta_len = skb->tail - (u8*)p_rta;
+                }
+        }
+#elif defined CONFIG_NET_CLS_POLICE
+        if (map->police && exts->police) {
+                struct rtattr * p_rta = (struct rtattr*) skb->tail;
+
+                RTA_PUT(skb, map->police, 0, NULL);
+
+                if (tcf_police_dump(skb, exts->police) < 0)
+                        goto rtattr_failure;
+
+                p_rta->rta_len = skb->tail - (u8*)p_rta;
+        }
+#endif
+        return 0;
+rtattr_failure: __attribute__ ((unused))
+        return -1;
+}
+
+int
+tcf_exts_dump_stats(struct sk_buff *skb, struct tcf_exts *exts,
+                    struct tcf_ext_map *map)
+{
+#ifdef CONFIG_NET_CLS_ACT
+        if (exts->action)
+                if (tcf_action_copy_stats(skb, exts->action, 1) < 0)
+                        goto rtattr_failure;
+#elif defined CONFIG_NET_CLS_POLICE
+        if (exts->police)
+                if (tcf_police_dump_stats(skb, exts->police) < 0)
+                        goto rtattr_failure;
+#endif
+        return 0;
+rtattr_failure: __attribute__ ((unused))
+        return -1;
+}
+
+static int __init tc_filter_init(void)
+{
+        struct rtnetlink_link *link_p = rtnetlink_links[PF_UNSPEC];
+
+        /* Setup rtnetlink links. It is made here to avoid
+           exporting large number of public symbols.
+         */
+
+        if (link_p) {
+                link_p[RTM_NEWTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
+                link_p[RTM_DELTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
+                link_p[RTM_GETTFILTER-RTM_BASE].doit = tc_ctl_tfilter;
+                link_p[RTM_GETTFILTER-RTM_BASE].dumpit = tc_dump_tfilter;
+        }
+        return 0;
+}
+
+subsys_initcall(tc_filter_init);
+
+EXPORT_SYMBOL(register_tcf_proto_ops);
+EXPORT_SYMBOL(unregister_tcf_proto_ops);
+EXPORT_SYMBOL(tcf_exts_validate);
+EXPORT_SYMBOL(tcf_exts_destroy);
+EXPORT_SYMBOL(tcf_exts_change);
+EXPORT_SYMBOL(tcf_exts_dump);
+EXPORT_SYMBOL(tcf_exts_dump_stats);