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-rw-r--r--net/sched/cls_api.c642
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 00000000000..56e66c3fe0f
--- /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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-19 18:25:53 +0000