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708 lines
20 KiB
708 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */ |
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|
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/* Written 1998-2000 by Werner Almesberger, EPFL ICA */ |
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|
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/string.h> |
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#include <linux/errno.h> |
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#include <linux/skbuff.h> |
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#include <linux/atmdev.h> |
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#include <linux/atmclip.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/file.h> /* for fput */ |
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#include <net/netlink.h> |
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#include <net/pkt_sched.h> |
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#include <net/pkt_cls.h> |
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|
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/* |
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* The ATM queuing discipline provides a framework for invoking classifiers |
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* (aka "filters"), which in turn select classes of this queuing discipline. |
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* Each class maps the flow(s) it is handling to a given VC. Multiple classes |
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* may share the same VC. |
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* |
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* When creating a class, VCs are specified by passing the number of the open |
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* socket descriptor by which the calling process references the VC. The kernel |
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* keeps the VC open at least until all classes using it are removed. |
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* |
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* In this file, most functions are named atm_tc_* to avoid confusion with all |
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* the atm_* in net/atm. This naming convention differs from what's used in the |
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* rest of net/sched. |
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* |
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* Known bugs: |
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* - sometimes messes up the IP stack |
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* - any manipulations besides the few operations described in the README, are |
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* untested and likely to crash the system |
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* - should lock the flow while there is data in the queue (?) |
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*/ |
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#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back)) |
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struct atm_flow_data { |
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struct Qdisc_class_common common; |
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struct Qdisc *q; /* FIFO, TBF, etc. */ |
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struct tcf_proto __rcu *filter_list; |
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struct tcf_block *block; |
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struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */ |
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void (*old_pop)(struct atm_vcc *vcc, |
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struct sk_buff *skb); /* chaining */ |
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struct atm_qdisc_data *parent; /* parent qdisc */ |
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struct socket *sock; /* for closing */ |
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int ref; /* reference count */ |
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struct gnet_stats_basic_packed bstats; |
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struct gnet_stats_queue qstats; |
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struct list_head list; |
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struct atm_flow_data *excess; /* flow for excess traffic; |
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NULL to set CLP instead */ |
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int hdr_len; |
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unsigned char hdr[]; /* header data; MUST BE LAST */ |
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}; |
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struct atm_qdisc_data { |
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struct atm_flow_data link; /* unclassified skbs go here */ |
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struct list_head flows; /* NB: "link" is also on this |
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list */ |
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struct tasklet_struct task; /* dequeue tasklet */ |
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}; |
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|
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/* ------------------------- Class/flow operations ------------------------- */ |
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|
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static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow; |
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|
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list_for_each_entry(flow, &p->flows, list) { |
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if (flow->common.classid == classid) |
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return flow; |
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} |
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return NULL; |
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} |
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static int atm_tc_graft(struct Qdisc *sch, unsigned long arg, |
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struct Qdisc *new, struct Qdisc **old, |
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struct netlink_ext_ack *extack) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
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|
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pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n", |
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sch, p, flow, new, old); |
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if (list_empty(&flow->list)) |
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return -EINVAL; |
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if (!new) |
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new = &noop_qdisc; |
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*old = flow->q; |
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flow->q = new; |
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if (*old) |
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qdisc_reset(*old); |
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return 0; |
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} |
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static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl) |
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{ |
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struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
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|
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pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow); |
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return flow ? flow->q : NULL; |
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} |
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static unsigned long atm_tc_find(struct Qdisc *sch, u32 classid) |
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{ |
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struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch); |
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struct atm_flow_data *flow; |
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|
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pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid); |
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flow = lookup_flow(sch, classid); |
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pr_debug("%s: flow %p\n", __func__, flow); |
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return (unsigned long)flow; |
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} |
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static unsigned long atm_tc_bind_filter(struct Qdisc *sch, |
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unsigned long parent, u32 classid) |
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{ |
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struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch); |
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struct atm_flow_data *flow; |
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|
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pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid); |
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flow = lookup_flow(sch, classid); |
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if (flow) |
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flow->ref++; |
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pr_debug("%s: flow %p\n", __func__, flow); |
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return (unsigned long)flow; |
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} |
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|
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/* |
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* atm_tc_put handles all destructions, including the ones that are explicitly |
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* requested (atm_tc_destroy, etc.). The assumption here is that we never drop |
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* anything that still seems to be in use. |
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*/ |
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static void atm_tc_put(struct Qdisc *sch, unsigned long cl) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
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|
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pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
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if (--flow->ref) |
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return; |
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pr_debug("atm_tc_put: destroying\n"); |
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list_del_init(&flow->list); |
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pr_debug("atm_tc_put: qdisc %p\n", flow->q); |
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qdisc_put(flow->q); |
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tcf_block_put(flow->block); |
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if (flow->sock) { |
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pr_debug("atm_tc_put: f_count %ld\n", |
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file_count(flow->sock->file)); |
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flow->vcc->pop = flow->old_pop; |
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sockfd_put(flow->sock); |
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} |
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if (flow->excess) |
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atm_tc_put(sch, (unsigned long)flow->excess); |
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if (flow != &p->link) |
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kfree(flow); |
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/* |
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* If flow == &p->link, the qdisc no longer works at this point and |
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* needs to be removed. (By the caller of atm_tc_put.) |
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*/ |
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} |
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static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
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{ |
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struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent; |
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pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p); |
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VCC2FLOW(vcc)->old_pop(vcc, skb); |
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tasklet_schedule(&p->task); |
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} |
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|
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static const u8 llc_oui_ip[] = { |
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0xaa, /* DSAP: non-ISO */ |
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0xaa, /* SSAP: non-ISO */ |
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0x03, /* Ctrl: Unnumbered Information Command PDU */ |
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0x00, /* OUI: EtherType */ |
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0x00, 0x00, |
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0x08, 0x00 |
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}; /* Ethertype IP (0800) */ |
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static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = { |
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[TCA_ATM_FD] = { .type = NLA_U32 }, |
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[TCA_ATM_EXCESS] = { .type = NLA_U32 }, |
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}; |
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static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent, |
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struct nlattr **tca, unsigned long *arg, |
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struct netlink_ext_ack *extack) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow = (struct atm_flow_data *)*arg; |
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struct atm_flow_data *excess = NULL; |
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struct nlattr *opt = tca[TCA_OPTIONS]; |
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struct nlattr *tb[TCA_ATM_MAX + 1]; |
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struct socket *sock; |
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int fd, error, hdr_len; |
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void *hdr; |
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pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x," |
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"flow %p,opt %p)\n", sch, p, classid, parent, flow, opt); |
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/* |
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* The concept of parents doesn't apply for this qdisc. |
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*/ |
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if (parent && parent != TC_H_ROOT && parent != sch->handle) |
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return -EINVAL; |
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/* |
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* ATM classes cannot be changed. In order to change properties of the |
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* ATM connection, that socket needs to be modified directly (via the |
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* native ATM API. In order to send a flow to a different VC, the old |
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* class needs to be removed and a new one added. (This may be changed |
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* later.) |
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*/ |
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if (flow) |
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return -EBUSY; |
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if (opt == NULL) |
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return -EINVAL; |
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error = nla_parse_nested_deprecated(tb, TCA_ATM_MAX, opt, atm_policy, |
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NULL); |
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if (error < 0) |
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return error; |
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if (!tb[TCA_ATM_FD]) |
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return -EINVAL; |
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fd = nla_get_u32(tb[TCA_ATM_FD]); |
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pr_debug("atm_tc_change: fd %d\n", fd); |
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if (tb[TCA_ATM_HDR]) { |
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hdr_len = nla_len(tb[TCA_ATM_HDR]); |
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hdr = nla_data(tb[TCA_ATM_HDR]); |
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} else { |
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hdr_len = RFC1483LLC_LEN; |
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hdr = NULL; /* default LLC/SNAP for IP */ |
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} |
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if (!tb[TCA_ATM_EXCESS]) |
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excess = NULL; |
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else { |
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excess = (struct atm_flow_data *) |
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atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS])); |
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if (!excess) |
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return -ENOENT; |
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} |
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pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n", |
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opt->nla_type, nla_len(opt), hdr_len); |
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sock = sockfd_lookup(fd, &error); |
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if (!sock) |
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return error; /* f_count++ */ |
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pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file)); |
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if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) { |
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error = -EPROTOTYPE; |
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goto err_out; |
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} |
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/* @@@ should check if the socket is really operational or we'll crash |
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on vcc->send */ |
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if (classid) { |
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if (TC_H_MAJ(classid ^ sch->handle)) { |
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pr_debug("atm_tc_change: classid mismatch\n"); |
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error = -EINVAL; |
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goto err_out; |
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} |
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} else { |
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int i; |
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unsigned long cl; |
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for (i = 1; i < 0x8000; i++) { |
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classid = TC_H_MAKE(sch->handle, 0x8000 | i); |
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cl = atm_tc_find(sch, classid); |
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if (!cl) |
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break; |
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} |
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} |
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pr_debug("atm_tc_change: new id %x\n", classid); |
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flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL); |
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pr_debug("atm_tc_change: flow %p\n", flow); |
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if (!flow) { |
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error = -ENOBUFS; |
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goto err_out; |
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} |
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error = tcf_block_get(&flow->block, &flow->filter_list, sch, |
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extack); |
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if (error) { |
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kfree(flow); |
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goto err_out; |
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} |
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flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid, |
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extack); |
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if (!flow->q) |
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flow->q = &noop_qdisc; |
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pr_debug("atm_tc_change: qdisc %p\n", flow->q); |
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flow->sock = sock; |
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flow->vcc = ATM_SD(sock); /* speedup */ |
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flow->vcc->user_back = flow; |
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pr_debug("atm_tc_change: vcc %p\n", flow->vcc); |
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flow->old_pop = flow->vcc->pop; |
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flow->parent = p; |
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flow->vcc->pop = sch_atm_pop; |
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flow->common.classid = classid; |
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flow->ref = 1; |
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flow->excess = excess; |
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list_add(&flow->list, &p->link.list); |
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flow->hdr_len = hdr_len; |
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if (hdr) |
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memcpy(flow->hdr, hdr, hdr_len); |
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else |
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memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip)); |
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*arg = (unsigned long)flow; |
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return 0; |
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err_out: |
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sockfd_put(sock); |
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return error; |
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} |
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static int atm_tc_delete(struct Qdisc *sch, unsigned long arg, |
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struct netlink_ext_ack *extack) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
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pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
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if (list_empty(&flow->list)) |
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return -EINVAL; |
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if (rcu_access_pointer(flow->filter_list) || flow == &p->link) |
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return -EBUSY; |
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/* |
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* Reference count must be 2: one for "keepalive" (set at class |
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* creation), and one for the reference held when calling delete. |
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*/ |
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if (flow->ref < 2) { |
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pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref); |
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return -EINVAL; |
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} |
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if (flow->ref > 2) |
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return -EBUSY; /* catch references via excess, etc. */ |
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atm_tc_put(sch, arg); |
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return 0; |
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} |
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|
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static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow; |
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|
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pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker); |
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if (walker->stop) |
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return; |
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list_for_each_entry(flow, &p->flows, list) { |
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if (walker->count >= walker->skip && |
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walker->fn(sch, (unsigned long)flow, walker) < 0) { |
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walker->stop = 1; |
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break; |
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} |
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walker->count++; |
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} |
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} |
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|
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static struct tcf_block *atm_tc_tcf_block(struct Qdisc *sch, unsigned long cl, |
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struct netlink_ext_ack *extack) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
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pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow); |
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return flow ? flow->block : p->link.block; |
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} |
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|
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/* --------------------------- Qdisc operations ---------------------------- */ |
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|
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static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch, |
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struct sk_buff **to_free) |
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{ |
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struct atm_qdisc_data *p = qdisc_priv(sch); |
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struct atm_flow_data *flow; |
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struct tcf_result res; |
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int result; |
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int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
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pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); |
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result = TC_ACT_OK; /* be nice to gcc */ |
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flow = NULL; |
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if (TC_H_MAJ(skb->priority) != sch->handle || |
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!(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) { |
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struct tcf_proto *fl; |
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|
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list_for_each_entry(flow, &p->flows, list) { |
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fl = rcu_dereference_bh(flow->filter_list); |
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if (fl) { |
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result = tcf_classify(skb, fl, &res, true); |
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if (result < 0) |
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continue; |
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flow = (struct atm_flow_data *)res.class; |
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if (!flow) |
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flow = lookup_flow(sch, res.classid); |
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goto done; |
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} |
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} |
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flow = NULL; |
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done: |
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; |
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} |
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if (!flow) { |
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flow = &p->link; |
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} else { |
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if (flow->vcc) |
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ATM_SKB(skb)->atm_options = flow->vcc->atm_options; |
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/*@@@ looks good ... but it's not supposed to work :-) */ |
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#ifdef CONFIG_NET_CLS_ACT |
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switch (result) { |
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case TC_ACT_QUEUED: |
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case TC_ACT_STOLEN: |
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case TC_ACT_TRAP: |
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__qdisc_drop(skb, to_free); |
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return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN; |
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case TC_ACT_SHOT: |
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__qdisc_drop(skb, to_free); |
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goto drop; |
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case TC_ACT_RECLASSIFY: |
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if (flow->excess) |
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flow = flow->excess; |
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else |
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ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP; |
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break; |
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} |
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#endif |
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} |
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|
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ret = qdisc_enqueue(skb, flow->q, to_free); |
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if (ret != NET_XMIT_SUCCESS) { |
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drop: __maybe_unused |
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if (net_xmit_drop_count(ret)) { |
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qdisc_qstats_drop(sch); |
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if (flow) |
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flow->qstats.drops++; |
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} |
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return ret; |
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} |
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/* |
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* Okay, this may seem weird. We pretend we've dropped the packet if |
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* it goes via ATM. The reason for this is that the outer qdisc |
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* expects to be able to q->dequeue the packet later on if we return |
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* success at this place. Also, sch->q.qdisc needs to reflect whether |
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* there is a packet egligible for dequeuing or not. Note that the |
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* statistics of the outer qdisc are necessarily wrong because of all |
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* this. There's currently no correct solution for this. |
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*/ |
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if (flow == &p->link) { |
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sch->q.qlen++; |
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return NET_XMIT_SUCCESS; |
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} |
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tasklet_schedule(&p->task); |
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return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
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} |
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|
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/* |
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* Dequeue packets and send them over ATM. Note that we quite deliberately |
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* avoid checking net_device's flow control here, simply because sch_atm |
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* uses its own channels, which have nothing to do with any CLIP/LANE/or |
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* non-ATM interfaces. |
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*/ |
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|
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static void sch_atm_dequeue(struct tasklet_struct *t) |
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{ |
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struct atm_qdisc_data *p = from_tasklet(p, t, task); |
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struct Qdisc *sch = qdisc_from_priv(p); |
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struct atm_flow_data *flow; |
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struct sk_buff *skb; |
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|
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pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p); |
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list_for_each_entry(flow, &p->flows, list) { |
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if (flow == &p->link) |
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continue; |
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/* |
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* If traffic is properly shaped, this won't generate nasty |
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* little bursts. Otherwise, it may ... (but that's okay) |
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*/ |
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while ((skb = flow->q->ops->peek(flow->q))) { |
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if (!atm_may_send(flow->vcc, skb->truesize)) |
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break; |
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|
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skb = qdisc_dequeue_peeked(flow->q); |
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if (unlikely(!skb)) |
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break; |
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|
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qdisc_bstats_update(sch, skb); |
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bstats_update(&flow->bstats, skb); |
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pr_debug("atm_tc_dequeue: sending on class %p\n", flow); |
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/* remove any LL header somebody else has attached */ |
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skb_pull(skb, skb_network_offset(skb)); |
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if (skb_headroom(skb) < flow->hdr_len) { |
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struct sk_buff *new; |
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|
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new = skb_realloc_headroom(skb, flow->hdr_len); |
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dev_kfree_skb(skb); |
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if (!new) |
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continue; |
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skb = new; |
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} |
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pr_debug("sch_atm_dequeue: ip %p, data %p\n", |
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skb_network_header(skb), skb->data); |
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ATM_SKB(skb)->vcc = flow->vcc; |
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memcpy(skb_push(skb, flow->hdr_len), flow->hdr, |
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flow->hdr_len); |
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refcount_add(skb->truesize, |
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&sk_atm(flow->vcc)->sk_wmem_alloc); |
|
/* atm.atm_options are already set by atm_tc_enqueue */ |
|
flow->vcc->send(flow->vcc, skb); |
|
} |
|
} |
|
} |
|
|
|
static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch) |
|
{ |
|
struct atm_qdisc_data *p = qdisc_priv(sch); |
|
struct sk_buff *skb; |
|
|
|
pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p); |
|
tasklet_schedule(&p->task); |
|
skb = qdisc_dequeue_peeked(p->link.q); |
|
if (skb) |
|
sch->q.qlen--; |
|
return skb; |
|
} |
|
|
|
static struct sk_buff *atm_tc_peek(struct Qdisc *sch) |
|
{ |
|
struct atm_qdisc_data *p = qdisc_priv(sch); |
|
|
|
pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p); |
|
|
|
return p->link.q->ops->peek(p->link.q); |
|
} |
|
|
|
static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct atm_qdisc_data *p = qdisc_priv(sch); |
|
int err; |
|
|
|
pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); |
|
INIT_LIST_HEAD(&p->flows); |
|
INIT_LIST_HEAD(&p->link.list); |
|
list_add(&p->link.list, &p->flows); |
|
p->link.q = qdisc_create_dflt(sch->dev_queue, |
|
&pfifo_qdisc_ops, sch->handle, extack); |
|
if (!p->link.q) |
|
p->link.q = &noop_qdisc; |
|
pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q); |
|
p->link.vcc = NULL; |
|
p->link.sock = NULL; |
|
p->link.common.classid = sch->handle; |
|
p->link.ref = 1; |
|
|
|
err = tcf_block_get(&p->link.block, &p->link.filter_list, sch, |
|
extack); |
|
if (err) |
|
return err; |
|
|
|
tasklet_setup(&p->task, sch_atm_dequeue); |
|
return 0; |
|
} |
|
|
|
static void atm_tc_reset(struct Qdisc *sch) |
|
{ |
|
struct atm_qdisc_data *p = qdisc_priv(sch); |
|
struct atm_flow_data *flow; |
|
|
|
pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p); |
|
list_for_each_entry(flow, &p->flows, list) |
|
qdisc_reset(flow->q); |
|
sch->q.qlen = 0; |
|
} |
|
|
|
static void atm_tc_destroy(struct Qdisc *sch) |
|
{ |
|
struct atm_qdisc_data *p = qdisc_priv(sch); |
|
struct atm_flow_data *flow, *tmp; |
|
|
|
pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p); |
|
list_for_each_entry(flow, &p->flows, list) { |
|
tcf_block_put(flow->block); |
|
flow->block = NULL; |
|
} |
|
|
|
list_for_each_entry_safe(flow, tmp, &p->flows, list) { |
|
if (flow->ref > 1) |
|
pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref); |
|
atm_tc_put(sch, (unsigned long)flow); |
|
} |
|
tasklet_kill(&p->task); |
|
} |
|
|
|
static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl, |
|
struct sk_buff *skb, struct tcmsg *tcm) |
|
{ |
|
struct atm_qdisc_data *p = qdisc_priv(sch); |
|
struct atm_flow_data *flow = (struct atm_flow_data *)cl; |
|
struct nlattr *nest; |
|
|
|
pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n", |
|
sch, p, flow, skb, tcm); |
|
if (list_empty(&flow->list)) |
|
return -EINVAL; |
|
tcm->tcm_handle = flow->common.classid; |
|
tcm->tcm_info = flow->q->handle; |
|
|
|
nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
|
if (nest == NULL) |
|
goto nla_put_failure; |
|
|
|
if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr)) |
|
goto nla_put_failure; |
|
if (flow->vcc) { |
|
struct sockaddr_atmpvc pvc; |
|
int state; |
|
|
|
memset(&pvc, 0, sizeof(pvc)); |
|
pvc.sap_family = AF_ATMPVC; |
|
pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1; |
|
pvc.sap_addr.vpi = flow->vcc->vpi; |
|
pvc.sap_addr.vci = flow->vcc->vci; |
|
if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc)) |
|
goto nla_put_failure; |
|
state = ATM_VF2VS(flow->vcc->flags); |
|
if (nla_put_u32(skb, TCA_ATM_STATE, state)) |
|
goto nla_put_failure; |
|
} |
|
if (flow->excess) { |
|
if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->common.classid)) |
|
goto nla_put_failure; |
|
} else { |
|
if (nla_put_u32(skb, TCA_ATM_EXCESS, 0)) |
|
goto nla_put_failure; |
|
} |
|
return nla_nest_end(skb, nest); |
|
|
|
nla_put_failure: |
|
nla_nest_cancel(skb, nest); |
|
return -1; |
|
} |
|
static int |
|
atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg, |
|
struct gnet_dump *d) |
|
{ |
|
struct atm_flow_data *flow = (struct atm_flow_data *)arg; |
|
|
|
if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch), |
|
d, NULL, &flow->bstats) < 0 || |
|
gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0) |
|
return -1; |
|
|
|
return 0; |
|
} |
|
|
|
static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb) |
|
{ |
|
return 0; |
|
} |
|
|
|
static const struct Qdisc_class_ops atm_class_ops = { |
|
.graft = atm_tc_graft, |
|
.leaf = atm_tc_leaf, |
|
.find = atm_tc_find, |
|
.change = atm_tc_change, |
|
.delete = atm_tc_delete, |
|
.walk = atm_tc_walk, |
|
.tcf_block = atm_tc_tcf_block, |
|
.bind_tcf = atm_tc_bind_filter, |
|
.unbind_tcf = atm_tc_put, |
|
.dump = atm_tc_dump_class, |
|
.dump_stats = atm_tc_dump_class_stats, |
|
}; |
|
|
|
static struct Qdisc_ops atm_qdisc_ops __read_mostly = { |
|
.cl_ops = &atm_class_ops, |
|
.id = "atm", |
|
.priv_size = sizeof(struct atm_qdisc_data), |
|
.enqueue = atm_tc_enqueue, |
|
.dequeue = atm_tc_dequeue, |
|
.peek = atm_tc_peek, |
|
.init = atm_tc_init, |
|
.reset = atm_tc_reset, |
|
.destroy = atm_tc_destroy, |
|
.dump = atm_tc_dump, |
|
.owner = THIS_MODULE, |
|
}; |
|
|
|
static int __init atm_init(void) |
|
{ |
|
return register_qdisc(&atm_qdisc_ops); |
|
} |
|
|
|
static void __exit atm_exit(void) |
|
{ |
|
unregister_qdisc(&atm_qdisc_ops); |
|
} |
|
|
|
module_init(atm_init) |
|
module_exit(atm_exit) |
|
MODULE_LICENSE("GPL");
|
|
|