254 lines
5.6 KiB
C
254 lines
5.6 KiB
C
/* net/sched/sch_ingress.c - Ingress qdisc
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Jamal Hadi Salim 1999
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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/* Thanks to Doron Oz for this hack */
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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static int nf_registered;
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#endif
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#endif
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struct ingress_qdisc_data {
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struct tcf_proto *filter_list;
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};
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/* ------------------------- Class/flow operations ------------------------- */
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static int ingress_graft(struct Qdisc *sch, unsigned long arg,
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struct Qdisc *new, struct Qdisc **old)
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{
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return -EOPNOTSUPP;
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}
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static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
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{
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return NULL;
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}
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static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
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{
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return TC_H_MIN(classid) + 1;
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}
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static unsigned long ingress_bind_filter(struct Qdisc *sch,
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unsigned long parent, u32 classid)
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{
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return ingress_get(sch, classid);
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}
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static void ingress_put(struct Qdisc *sch, unsigned long cl)
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{
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}
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static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
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struct rtattr **tca, unsigned long *arg)
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{
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return 0;
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}
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static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
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{
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return;
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}
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static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
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{
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struct ingress_qdisc_data *p = qdisc_priv(sch);
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return &p->filter_list;
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}
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/* --------------------------- Qdisc operations ---------------------------- */
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static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
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{
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struct ingress_qdisc_data *p = qdisc_priv(sch);
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struct tcf_result res;
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int result;
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result = tc_classify(skb, p->filter_list, &res);
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/*
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* Unlike normal "enqueue" functions, ingress_enqueue returns a
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* firewall FW_* code.
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*/
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#ifdef CONFIG_NET_CLS_ACT
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sch->bstats.packets++;
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sch->bstats.bytes += skb->len;
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switch (result) {
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case TC_ACT_SHOT:
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result = TC_ACT_SHOT;
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sch->qstats.drops++;
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break;
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case TC_ACT_STOLEN:
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case TC_ACT_QUEUED:
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result = TC_ACT_STOLEN;
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break;
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case TC_ACT_RECLASSIFY:
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case TC_ACT_OK:
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skb->tc_index = TC_H_MIN(res.classid);
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default:
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result = TC_ACT_OK;
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break;
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}
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#else
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result = NF_ACCEPT;
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sch->bstats.packets++;
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sch->bstats.bytes += skb->len;
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#endif
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return result;
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}
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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static unsigned int ing_hook(unsigned int hook, struct sk_buff *skb,
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const struct net_device *indev,
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const struct net_device *outdev,
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int (*okfn)(struct sk_buff *))
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{
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struct Qdisc *q;
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struct net_device *dev = skb->dev;
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int fwres = NF_ACCEPT;
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if (dev->qdisc_ingress) {
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spin_lock(&dev->ingress_lock);
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if ((q = dev->qdisc_ingress) != NULL)
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fwres = q->enqueue(skb, q);
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spin_unlock(&dev->ingress_lock);
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}
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return fwres;
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}
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/* after ipt_filter */
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static struct nf_hook_ops ing_ops[] __read_mostly = {
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{
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.hook = ing_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_INET_PRE_ROUTING,
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.priority = NF_IP_PRI_FILTER + 1,
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},
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{
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.hook = ing_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET6,
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.hooknum = NF_INET_PRE_ROUTING,
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.priority = NF_IP6_PRI_FILTER + 1,
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},
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};
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#endif
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#endif
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static int ingress_init(struct Qdisc *sch, struct rtattr *opt)
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{
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
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if (!nf_registered) {
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if (nf_register_hooks(ing_ops, ARRAY_SIZE(ing_ops)) < 0) {
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printk("ingress qdisc registration error \n");
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return -EINVAL;
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}
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nf_registered++;
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}
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#endif
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#endif
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return 0;
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}
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/* ------------------------------------------------------------- */
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static void ingress_destroy(struct Qdisc *sch)
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{
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struct ingress_qdisc_data *p = qdisc_priv(sch);
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tcf_destroy_chain(p->filter_list);
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}
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static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct rtattr *rta;
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rta = (struct rtattr *)b;
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RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
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rta->rta_len = skb_tail_pointer(skb) - b;
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return skb->len;
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rtattr_failure:
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nlmsg_trim(skb, b);
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return -1;
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}
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static const struct Qdisc_class_ops ingress_class_ops = {
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.graft = ingress_graft,
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.leaf = ingress_leaf,
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.get = ingress_get,
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.put = ingress_put,
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.change = ingress_change,
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.walk = ingress_walk,
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.tcf_chain = ingress_find_tcf,
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.bind_tcf = ingress_bind_filter,
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.unbind_tcf = ingress_put,
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};
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static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
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.cl_ops = &ingress_class_ops,
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.id = "ingress",
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.priv_size = sizeof(struct ingress_qdisc_data),
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.enqueue = ingress_enqueue,
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.init = ingress_init,
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.destroy = ingress_destroy,
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.dump = ingress_dump,
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.owner = THIS_MODULE,
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};
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static int __init ingress_module_init(void)
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{
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int ret = 0;
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if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) {
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printk("Unable to register Ingress qdisc\n");
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return ret;
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}
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return ret;
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}
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static void __exit ingress_module_exit(void)
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{
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unregister_qdisc(&ingress_qdisc_ops);
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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if (nf_registered)
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nf_unregister_hooks(ing_ops, ARRAY_SIZE(ing_ops));
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#endif
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#endif
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}
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module_init(ingress_module_init)
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module_exit(ingress_module_exit)
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MODULE_LICENSE("GPL");
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