| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /* net/sched/sch_ingress.c - Ingress qdisc |
| 2 | * This program is free software; you can redistribute it and/or |
| 3 | * modify it under the terms of the GNU General Public License |
| 4 | * as published by the Free Software Foundation; either version |
| 5 | * 2 of the License, or (at your option) any later version. |
| 6 | * |
| 7 | * Authors: Jamal Hadi Salim 1999 |
| 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/list.h> |
| 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/rtnetlink.h> |
| 15 | |
| 16 | #include <net/netlink.h> |
| 17 | #include <net/pkt_sched.h> |
| 18 | |
| 19 | static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) |
| 20 | { |
| 21 | return NULL; |
| 22 | } |
| 23 | |
| 24 | static unsigned long ingress_get(struct Qdisc *sch, u32 classid) |
| 25 | { |
| 26 | return TC_H_MIN(classid) + 1; |
| 27 | } |
| 28 | |
| 29 | static unsigned long ingress_bind_filter(struct Qdisc *sch, |
| 30 | unsigned long parent, u32 classid) |
| 31 | { |
| 32 | return ingress_get(sch, classid); |
| 33 | } |
| 34 | |
| 35 | static void ingress_put(struct Qdisc *sch, unsigned long cl) |
| 36 | { |
| 37 | } |
| 38 | |
| 39 | static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
| 40 | { |
| 41 | } |
| 42 | |
| 43 | static struct tcf_proto __rcu **ingress_find_tcf(struct Qdisc *sch, |
| 44 | unsigned long cl) |
| 45 | { |
| 46 | struct net_device *dev = qdisc_dev(sch); |
| 47 | |
| 48 | return &dev->ingress_cl_list; |
| 49 | } |
| 50 | |
| 51 | static int ingress_init(struct Qdisc *sch, struct nlattr *opt) |
| 52 | { |
| 53 | net_inc_ingress_queue(); |
| 54 | sch->flags |= TCQ_F_CPUSTATS; |
| 55 | |
| 56 | return 0; |
| 57 | } |
| 58 | |
| 59 | static void ingress_destroy(struct Qdisc *sch) |
| 60 | { |
| 61 | struct net_device *dev = qdisc_dev(sch); |
| 62 | |
| 63 | tcf_destroy_chain(&dev->ingress_cl_list); |
| 64 | net_dec_ingress_queue(); |
| 65 | } |
| 66 | |
| 67 | static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 68 | { |
| 69 | struct nlattr *nest; |
| 70 | |
| 71 | nest = nla_nest_start(skb, TCA_OPTIONS); |
| 72 | if (nest == NULL) |
| 73 | goto nla_put_failure; |
| 74 | |
| 75 | return nla_nest_end(skb, nest); |
| 76 | |
| 77 | nla_put_failure: |
| 78 | nla_nest_cancel(skb, nest); |
| 79 | return -1; |
| 80 | } |
| 81 | |
| 82 | static const struct Qdisc_class_ops ingress_class_ops = { |
| 83 | .leaf = ingress_leaf, |
| 84 | .get = ingress_get, |
| 85 | .put = ingress_put, |
| 86 | .walk = ingress_walk, |
| 87 | .tcf_chain = ingress_find_tcf, |
| 88 | .bind_tcf = ingress_bind_filter, |
| 89 | .unbind_tcf = ingress_put, |
| 90 | }; |
| 91 | |
| 92 | static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { |
| 93 | .cl_ops = &ingress_class_ops, |
| 94 | .id = "ingress", |
| 95 | .init = ingress_init, |
| 96 | .destroy = ingress_destroy, |
| 97 | .dump = ingress_dump, |
| 98 | .owner = THIS_MODULE, |
| 99 | }; |
| 100 | |
| 101 | static int __init ingress_module_init(void) |
| 102 | { |
| 103 | return register_qdisc(&ingress_qdisc_ops); |
| 104 | } |
| 105 | |
| 106 | static void __exit ingress_module_exit(void) |
| 107 | { |
| 108 | unregister_qdisc(&ingress_qdisc_ops); |
| 109 | } |
| 110 | |
| 111 | module_init(ingress_module_init); |
| 112 | module_exit(ingress_module_exit); |
| 113 | |
| 114 | MODULE_LICENSE("GPL"); |