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-rw-r--r--net/sched/cls_fw.c460
1 files changed, 460 insertions, 0 deletions
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
new file mode 100644
index 000000000..08c41f197
--- /dev/null
+++ b/net/sched/cls_fw.c
@@ -0,0 +1,460 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
+ *
+ * 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
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <net/netlink.h>
+#include <net/act_api.h>
+#include <net/pkt_cls.h>
+#include <net/sch_generic.h>
+
+#define HTSIZE 256
+
+struct fw_head {
+ u32 mask;
+ struct fw_filter __rcu *ht[HTSIZE];
+ struct rcu_head rcu;
+};
+
+struct fw_filter {
+ struct fw_filter __rcu *next;
+ u32 id;
+ struct tcf_result res;
+ int ifindex;
+ struct tcf_exts exts;
+ struct tcf_proto *tp;
+ struct rcu_work rwork;
+};
+
+static u32 fw_hash(u32 handle)
+{
+ handle ^= (handle >> 16);
+ handle ^= (handle >> 8);
+ return handle % HTSIZE;
+}
+
+static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+ struct tcf_result *res)
+{
+ struct fw_head *head = rcu_dereference_bh(tp->root);
+ struct fw_filter *f;
+ int r;
+ u32 id = skb->mark;
+
+ if (head != NULL) {
+ id &= head->mask;
+
+ for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
+ f = rcu_dereference_bh(f->next)) {
+ if (f->id == id) {
+ *res = f->res;
+ if (!tcf_match_indev(skb, f->ifindex))
+ continue;
+ r = tcf_exts_exec(skb, &f->exts, res);
+ if (r < 0)
+ continue;
+
+ return r;
+ }
+ }
+ } else {
+ struct Qdisc *q = tcf_block_q(tp->chain->block);
+
+ /* Old method: classify the packet using its skb mark. */
+ if (id && (TC_H_MAJ(id) == 0 ||
+ !(TC_H_MAJ(id ^ q->handle)))) {
+ res->classid = id;
+ res->class = 0;
+ return 0;
+ }
+ }
+
+ return -1;
+}
+
+static void *fw_get(struct tcf_proto *tp, u32 handle)
+{
+ struct fw_head *head = rtnl_dereference(tp->root);
+ struct fw_filter *f;
+
+ if (head == NULL)
+ return NULL;
+
+ f = rtnl_dereference(head->ht[fw_hash(handle)]);
+ for (; f; f = rtnl_dereference(f->next)) {
+ if (f->id == handle)
+ return f;
+ }
+ return NULL;
+}
+
+static int fw_init(struct tcf_proto *tp)
+{
+ /* We don't allocate fw_head here, because in the old method
+ * we don't need it at all.
+ */
+ return 0;
+}
+
+static void __fw_delete_filter(struct fw_filter *f)
+{
+ tcf_exts_destroy(&f->exts);
+ tcf_exts_put_net(&f->exts);
+ kfree(f);
+}
+
+static void fw_delete_filter_work(struct work_struct *work)
+{
+ struct fw_filter *f = container_of(to_rcu_work(work),
+ struct fw_filter,
+ rwork);
+ rtnl_lock();
+ __fw_delete_filter(f);
+ rtnl_unlock();
+}
+
+static void fw_destroy(struct tcf_proto *tp, bool rtnl_held,
+ struct netlink_ext_ack *extack)
+{
+ struct fw_head *head = rtnl_dereference(tp->root);
+ struct fw_filter *f;
+ int h;
+
+ if (head == NULL)
+ return;
+
+ for (h = 0; h < HTSIZE; h++) {
+ while ((f = rtnl_dereference(head->ht[h])) != NULL) {
+ RCU_INIT_POINTER(head->ht[h],
+ rtnl_dereference(f->next));
+ tcf_unbind_filter(tp, &f->res);
+ if (tcf_exts_get_net(&f->exts))
+ tcf_queue_work(&f->rwork, fw_delete_filter_work);
+ else
+ __fw_delete_filter(f);
+ }
+ }
+ kfree_rcu(head, rcu);
+}
+
+static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
+ bool rtnl_held, struct netlink_ext_ack *extack)
+{
+ struct fw_head *head = rtnl_dereference(tp->root);
+ struct fw_filter *f = arg;
+ struct fw_filter __rcu **fp;
+ struct fw_filter *pfp;
+ int ret = -EINVAL;
+ int h;
+
+ if (head == NULL || f == NULL)
+ goto out;
+
+ fp = &head->ht[fw_hash(f->id)];
+
+ for (pfp = rtnl_dereference(*fp); pfp;
+ fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
+ if (pfp == f) {
+ RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
+ tcf_unbind_filter(tp, &f->res);
+ tcf_exts_get_net(&f->exts);
+ tcf_queue_work(&f->rwork, fw_delete_filter_work);
+ ret = 0;
+ break;
+ }
+ }
+
+ *last = true;
+ for (h = 0; h < HTSIZE; h++) {
+ if (rcu_access_pointer(head->ht[h])) {
+ *last = false;
+ break;
+ }
+ }
+
+out:
+ return ret;
+}
+
+static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
+ [TCA_FW_CLASSID] = { .type = NLA_U32 },
+ [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
+ [TCA_FW_MASK] = { .type = NLA_U32 },
+};
+
+static int fw_set_parms(struct net *net, struct tcf_proto *tp,
+ struct fw_filter *f, struct nlattr **tb,
+ struct nlattr **tca, unsigned long base, bool ovr,
+ struct netlink_ext_ack *extack)
+{
+ struct fw_head *head = rtnl_dereference(tp->root);
+ u32 mask;
+ int err;
+
+ err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
+ true, extack);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_FW_INDEV]) {
+ int ret;
+ ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
+ if (ret < 0)
+ return ret;
+ f->ifindex = ret;
+ }
+
+ err = -EINVAL;
+ if (tb[TCA_FW_MASK]) {
+ mask = nla_get_u32(tb[TCA_FW_MASK]);
+ if (mask != head->mask)
+ return err;
+ } else if (head->mask != 0xFFFFFFFF)
+ return err;
+
+ if (tb[TCA_FW_CLASSID]) {
+ f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
+ tcf_bind_filter(tp, &f->res, base);
+ }
+
+ return 0;
+}
+
+static int fw_change(struct net *net, struct sk_buff *in_skb,
+ struct tcf_proto *tp, unsigned long base,
+ u32 handle, struct nlattr **tca, void **arg,
+ bool ovr, bool rtnl_held,
+ struct netlink_ext_ack *extack)
+{
+ struct fw_head *head = rtnl_dereference(tp->root);
+ struct fw_filter *f = *arg;
+ struct nlattr *opt = tca[TCA_OPTIONS];
+ struct nlattr *tb[TCA_FW_MAX + 1];
+ int err;
+
+ if (!opt)
+ return handle ? -EINVAL : 0; /* Succeed if it is old method. */
+
+ err = nla_parse_nested_deprecated(tb, TCA_FW_MAX, opt, fw_policy,
+ NULL);
+ if (err < 0)
+ return err;
+
+ if (f) {
+ struct fw_filter *pfp, *fnew;
+ struct fw_filter __rcu **fp;
+
+ if (f->id != handle && handle)
+ return -EINVAL;
+
+ fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
+ if (!fnew)
+ return -ENOBUFS;
+
+ fnew->id = f->id;
+ fnew->ifindex = f->ifindex;
+ fnew->tp = f->tp;
+
+ err = tcf_exts_init(&fnew->exts, net, TCA_FW_ACT,
+ TCA_FW_POLICE);
+ if (err < 0) {
+ kfree(fnew);
+ return err;
+ }
+
+ err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
+ if (err < 0) {
+ tcf_exts_destroy(&fnew->exts);
+ kfree(fnew);
+ return err;
+ }
+
+ fp = &head->ht[fw_hash(fnew->id)];
+ for (pfp = rtnl_dereference(*fp); pfp;
+ fp = &pfp->next, pfp = rtnl_dereference(*fp))
+ if (pfp == f)
+ break;
+
+ RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
+ rcu_assign_pointer(*fp, fnew);
+ tcf_unbind_filter(tp, &f->res);
+ tcf_exts_get_net(&f->exts);
+ tcf_queue_work(&f->rwork, fw_delete_filter_work);
+
+ *arg = fnew;
+ return err;
+ }
+
+ if (!handle)
+ return -EINVAL;
+
+ if (!head) {
+ u32 mask = 0xFFFFFFFF;
+ if (tb[TCA_FW_MASK])
+ mask = nla_get_u32(tb[TCA_FW_MASK]);
+
+ head = kzalloc(sizeof(*head), GFP_KERNEL);
+ if (!head)
+ return -ENOBUFS;
+ head->mask = mask;
+
+ rcu_assign_pointer(tp->root, head);
+ }
+
+ f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
+ if (f == NULL)
+ return -ENOBUFS;
+
+ err = tcf_exts_init(&f->exts, net, TCA_FW_ACT, TCA_FW_POLICE);
+ if (err < 0)
+ goto errout;
+ f->id = handle;
+ f->tp = tp;
+
+ err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
+ if (err < 0)
+ goto errout;
+
+ RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
+ rcu_assign_pointer(head->ht[fw_hash(handle)], f);
+
+ *arg = f;
+ return 0;
+
+errout:
+ tcf_exts_destroy(&f->exts);
+ kfree(f);
+ return err;
+}
+
+static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg,
+ bool rtnl_held)
+{
+ struct fw_head *head = rtnl_dereference(tp->root);
+ int h;
+
+ if (head == NULL)
+ arg->stop = 1;
+
+ if (arg->stop)
+ return;
+
+ for (h = 0; h < HTSIZE; h++) {
+ struct fw_filter *f;
+
+ for (f = rtnl_dereference(head->ht[h]); f;
+ f = rtnl_dereference(f->next)) {
+ if (arg->count < arg->skip) {
+ arg->count++;
+ continue;
+ }
+ if (arg->fn(tp, f, arg) < 0) {
+ arg->stop = 1;
+ return;
+ }
+ arg->count++;
+ }
+ }
+}
+
+static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh,
+ struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
+{
+ struct fw_head *head = rtnl_dereference(tp->root);
+ struct fw_filter *f = fh;
+ struct nlattr *nest;
+
+ if (f == NULL)
+ return skb->len;
+
+ t->tcm_handle = f->id;
+
+ if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
+ return skb->len;
+
+ nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ if (f->res.classid &&
+ nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
+ goto nla_put_failure;
+ if (f->ifindex) {
+ struct net_device *dev;
+ dev = __dev_get_by_index(net, f->ifindex);
+ if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
+ goto nla_put_failure;
+ }
+ if (head->mask != 0xFFFFFFFF &&
+ nla_put_u32(skb, TCA_FW_MASK, head->mask))
+ goto nla_put_failure;
+
+ if (tcf_exts_dump(skb, &f->exts) < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+
+ if (tcf_exts_dump_stats(skb, &f->exts) < 0)
+ goto nla_put_failure;
+
+ return skb->len;
+
+nla_put_failure:
+ nla_nest_cancel(skb, nest);
+ return -1;
+}
+
+static void fw_bind_class(void *fh, u32 classid, unsigned long cl, void *q,
+ unsigned long base)
+{
+ struct fw_filter *f = fh;
+
+ if (f && f->res.classid == classid) {
+ if (cl)
+ __tcf_bind_filter(q, &f->res, base);
+ else
+ __tcf_unbind_filter(q, &f->res);
+ }
+}
+
+static struct tcf_proto_ops cls_fw_ops __read_mostly = {
+ .kind = "fw",
+ .classify = fw_classify,
+ .init = fw_init,
+ .destroy = fw_destroy,
+ .get = fw_get,
+ .change = fw_change,
+ .delete = fw_delete,
+ .walk = fw_walk,
+ .dump = fw_dump,
+ .bind_class = fw_bind_class,
+ .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");
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