/* net/sched/sch_ingress.c - Ingress qdisc * 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: Jamal Hadi Salim 1999 */ #include <linux/module.h> #include <linux/types.h> #include <linux/list.h> #include <linux/skbuff.h> #include <linux/rtnetlink.h> #include <net/netlink.h> #include <net/pkt_sched.h> struct ingress_qdisc_data { struct tcf_proto *filter_list; }; /* ------------------------- Class/flow operations ------------------------- */ static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg) { return NULL; } static unsigned long ingress_get(struct Qdisc *sch, u32 classid) { return TC_H_MIN(classid) + 1; } static unsigned long ingress_bind_filter(struct Qdisc *sch, unsigned long parent, u32 classid) { return ingress_get(sch, classid); } static void ingress_put(struct Qdisc *sch, unsigned long cl) { } static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker) { } static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl) { struct ingress_qdisc_data *p = qdisc_priv(sch); return &p->filter_list; } /* --------------------------- Qdisc operations ---------------------------- */ static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch) { struct ingress_qdisc_data *p = qdisc_priv(sch); struct tcf_result res; int result; result = tc_classify(skb, p->filter_list, &res); qdisc_bstats_update(sch, skb); switch (result) { case TC_ACT_SHOT: result = TC_ACT_SHOT; sch->qstats.drops++; break; case TC_ACT_STOLEN: case TC_ACT_QUEUED: result = TC_ACT_STOLEN; break; case TC_ACT_RECLASSIFY: case TC_ACT_OK: skb->tc_index = TC_H_MIN(res.classid); default: result = TC_ACT_OK; break; } return result; } /* ------------------------------------------------------------- */ static void ingress_destroy(struct Qdisc *sch) { struct ingress_qdisc_data *p = qdisc_priv(sch); tcf_destroy_chain(&p->filter_list); } static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb) { struct nlattr *nest; nest = nla_nest_start(skb, TCA_OPTIONS); if (nest == NULL) goto nla_put_failure; nla_nest_end(skb, nest); return skb->len; nla_put_failure: nla_nest_cancel(skb, nest); return -1; } static const struct Qdisc_class_ops ingress_class_ops = { .leaf = ingress_leaf, .get = ingress_get, .put = ingress_put, .walk = ingress_walk, .tcf_chain = ingress_find_tcf, .bind_tcf = ingress_bind_filter, .unbind_tcf = ingress_put, }; static struct Qdisc_ops ingress_qdisc_ops __read_mostly = { .cl_ops = &ingress_class_ops, .id = "ingress", .priv_size = sizeof(struct ingress_qdisc_data), .enqueue = ingress_enqueue, .destroy = ingress_destroy, .dump = ingress_dump, .owner = THIS_MODULE, }; static int __init ingress_module_init(void) { return register_qdisc(&ingress_qdisc_ops); } static void __exit ingress_module_exit(void) { unregister_qdisc(&ingress_qdisc_ops); } module_init(ingress_module_init) module_exit(ingress_module_exit) MODULE_LICENSE("GPL");