zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/net/sched/cls_route.c b/ap/os/linux/linux-3.4.x/net/sched/cls_route.c
new file mode 100755
index 0000000..7b41c5b
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/sched/cls_route.c
@@ -0,0 +1,627 @@
+/*
+ * 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/slab.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <net/dst.h>
+#include <net/route.h>
+#include <net/netlink.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 const 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 void
+route4_reset_fastmap(struct Qdisc *q, struct route4_head *head, u32 id)
+{
+ spinlock_t *root_lock = qdisc_root_sleeping_lock(q);
+
+ spin_lock_bh(root_lock);
+ memset(head->fastmap, 0, sizeof(head->fastmap));
+ spin_unlock_bh(root_lock);
+}
+
+static void
+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, const 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;
+
+ dst = skb_dst(skb);
+ if (!dst)
+ goto failure;
+
+ id = dst->tclassid;
+ if (head == NULL)
+ goto old_method;
+
+ iif = ((struct rtable *)dst)->rt_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:
+ b = head->table[h];
+ if (b) {
+ 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 int 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;
+
+ b = head->table[h1];
+ if (b) {
+ 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 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 = tp->root;
+ int h1, h2;
+
+ if (head == NULL)
+ return;
+
+ for (h1 = 0; h1 <= 256; h1++) {
+ struct route4_bucket *b;
+
+ b = head->table[h1];
+ if (b) {
+ 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 int 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, 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 const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = {
+ [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 },
+ [TCA_ROUTE4_TO] = { .type = NLA_U32 },
+ [TCA_ROUTE4_FROM] = { .type = NLA_U32 },
+ [TCA_ROUTE4_IIF] = { .type = NLA_U32 },
+};
+
+static int route4_set_parms(struct tcf_proto *tp, unsigned long base,
+ struct route4_filter *f, u32 handle, struct route4_head *head,
+ struct nlattr **tb, struct nlattr *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_TO]) {
+ if (new && handle & 0x8000)
+ goto errout;
+ to = nla_get_u32(tb[TCA_ROUTE4_TO]);
+ if (to > 0xFF)
+ goto errout;
+ nhandle = to;
+ }
+
+ if (tb[TCA_ROUTE4_FROM]) {
+ if (tb[TCA_ROUTE4_IIF])
+ goto errout;
+ id = nla_get_u32(tb[TCA_ROUTE4_FROM]);
+ if (id > 0xFF)
+ goto errout;
+ nhandle |= id << 16;
+ } else if (tb[TCA_ROUTE4_IIF]) {
+ id = nla_get_u32(tb[TCA_ROUTE4_IIF]);
+ 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);
+ b = head->table[h1];
+ if (!b) {
+ err = -ENOBUFS;
+ b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL);
+ if (b == NULL)
+ goto errout;
+
+ 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])
+ f->id = to;
+
+ if (tb[TCA_ROUTE4_FROM])
+ f->id = to | id<<16;
+ else if (tb[TCA_ROUTE4_IIF])
+ f->iif = id;
+
+ f->handle = nhandle;
+ f->bkt = b;
+ tcf_tree_unlock(tp);
+
+ if (tb[TCA_ROUTE4_CLASSID]) {
+ f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]);
+ 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 nlattr **tca,
+ unsigned long *arg)
+{
+ struct route4_head *head = tp->root;
+ struct route4_filter *f, *f1, **fp;
+ struct route4_bucket *b;
+ struct nlattr *opt = tca[TCA_OPTIONS];
+ struct nlattr *tb[TCA_ROUTE4_MAX + 1];
+ unsigned int h, th;
+ u32 old_handle = 0;
+ int err;
+
+ if (opt == NULL)
+ return handle ? -EINVAL : 0;
+
+ err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy);
+ if (err < 0)
+ return err;
+
+ f = (struct route4_filter *)*arg;
+ if (f) {
+ 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], 0);
+ if (err < 0)
+ return err;
+
+ goto reinsert;
+ }
+
+ err = -ENOBUFS;
+ if (head == NULL) {
+ head = kzalloc(sizeof(struct route4_head), GFP_KERNEL);
+ if (head == NULL)
+ goto errout;
+
+ tcf_tree_lock(tp);
+ tp->root = head;
+ tcf_tree_unlock(tp);
+ }
+
+ f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL);
+ if (f == NULL)
+ goto errout;
+
+ err = route4_set_parms(tp, base, f, handle, head, tb,
+ tca[TCA_RATE], 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);
+ b = head->table[th];
+ if (b) {
+ for (fp = &b->ht[h]; *fp; fp = &(*fp)->next) {
+ if (*fp == f) {
+ rcu_assign_pointer(*fp, f->next); //CVE-2021-3715
+ break;
+ }
+ }
+ }
+ }
+ tcf_tree_unlock(tp);
+
+ route4_reset_fastmap(tp->q, head, f->id);
+ *arg = (unsigned long)f;
+ return 0;
+
+errout:
+ kfree(f);
+ return err;
+}
+
+static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+ struct route4_head *head = tp->root;
+ unsigned int 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_pointer(skb);
+ struct nlattr *nest;
+ u32 id;
+
+ if (f == NULL)
+ return skb->len;
+
+ t->tcm_handle = f->handle;
+
+ nest = nla_nest_start(skb, TCA_OPTIONS);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ if (!(f->handle & 0x8000)) {
+ id = f->id & 0xFF;
+ NLA_PUT_U32(skb, TCA_ROUTE4_TO, id);
+ }
+ if (f->handle & 0x80000000) {
+ if ((f->handle >> 16) != 0xFFFF)
+ NLA_PUT_U32(skb, TCA_ROUTE4_IIF, f->iif);
+ } else {
+ id = f->id >> 16;
+ NLA_PUT_U32(skb, TCA_ROUTE4_FROM, id);
+ }
+ if (f->res.classid)
+ NLA_PUT_U32(skb, TCA_ROUTE4_CLASSID, f->res.classid);
+
+ if (tcf_exts_dump(skb, &f->exts, &route_ext_map) < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+
+ if (tcf_exts_dump_stats(skb, &f->exts, &route_ext_map) < 0)
+ goto nla_put_failure;
+
+ return skb->len;
+
+nla_put_failure:
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static struct tcf_proto_ops cls_route4_ops __read_mostly = {
+ .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");