2005-04-16 18:20:36 -04:00
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/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
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/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
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#include <linux/module.h>
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#include <linux/init.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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2007-07-15 03:01:25 -04:00
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#include <linux/file.h> /* for fput */
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2007-03-26 02:06:12 -04:00
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#include <net/netlink.h>
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2005-04-16 18:20:36 -04:00
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#include <net/pkt_sched.h>
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2007-07-15 03:01:25 -04:00
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extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
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2005-04-16 18:20:36 -04:00
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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 *q; /* FIFO, TBF, etc. */
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2005-04-16 18:20:36 -04:00
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struct tcf_proto *filter_list;
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2007-07-15 03:01:25 -04:00
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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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2008-01-21 05:25:29 -05:00
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struct sk_buff *skb); /* chaining */
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2005-04-16 18:20:36 -04:00
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struct atm_qdisc_data *parent; /* parent qdisc */
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struct socket *sock; /* for closing */
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u32 classid; /* x:y type ID */
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int ref; /* reference count */
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struct gnet_stats_basic bstats;
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struct gnet_stats_queue qstats;
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struct atm_flow_data *next;
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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[0]; /* 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 atm_flow_data *flows; /* NB: "link" is also on this
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list */
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struct tasklet_struct task; /* requeue tasklet */
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};
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/* ------------------------- Class/flow operations ------------------------- */
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2007-07-15 03:01:25 -04:00
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static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
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2005-04-16 18:20:36 -04:00
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{
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struct atm_flow_data *walk;
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2008-01-21 05:25:29 -05:00
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pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
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2005-04-16 18:20:36 -04:00
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for (walk = qdisc->flows; walk; walk = walk->next)
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2007-07-15 03:01:25 -04:00
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if (walk == flow)
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return 1;
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2008-01-21 05:25:29 -05:00
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pr_debug("find_flow: not found\n");
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2005-04-16 18:20:36 -04:00
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return 0;
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}
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2007-07-15 03:01:25 -04:00
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static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
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2005-04-16 18:20:36 -04:00
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{
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struct atm_qdisc_data *p = qdisc_priv(sch);
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2005-04-16 18:20:36 -04:00
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struct atm_flow_data *flow;
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2007-02-09 09:25:16 -05:00
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for (flow = p->flows; flow; flow = flow->next)
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2007-07-15 03:01:25 -04:00
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if (flow->classid == classid)
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break;
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2005-04-16 18:20:36 -04:00
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return flow;
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}
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2007-07-15 03:01:25 -04:00
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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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2005-04-16 18:20:36 -04:00
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{
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2008-01-21 05:25:29 -05:00
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struct atm_qdisc_data *p = qdisc_priv(sch);
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2007-07-15 03:01:25 -04:00
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struct atm_flow_data *flow = (struct atm_flow_data *)arg;
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
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2007-07-15 03:01:25 -04:00
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sch, p, flow, new, old);
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if (!find_flow(p, flow))
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return -EINVAL;
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if (!new)
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new = &noop_qdisc;
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*old = xchg(&flow->q, new);
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if (*old)
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qdisc_reset(*old);
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2007-02-09 09:25:16 -05:00
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return 0;
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2005-04-16 18:20:36 -04:00
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}
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2007-07-15 03:01:25 -04:00
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static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
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2005-04-16 18:20:36 -04:00
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{
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struct atm_flow_data *flow = (struct atm_flow_data *)cl;
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2005-04-16 18:20:36 -04:00
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
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2005-04-16 18:20:36 -04:00
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return flow ? flow->q : NULL;
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}
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2007-07-15 03:01:25 -04:00
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static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
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2005-04-16 18:20:36 -04:00
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{
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2008-01-21 05:25:29 -05:00
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struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
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2005-04-16 18:20:36 -04:00
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struct atm_flow_data *flow;
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
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2007-07-15 03:01:25 -04:00
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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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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_get: flow %p\n", flow);
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2007-07-15 03:01:25 -04:00
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return (unsigned long)flow;
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2005-04-16 18:20:36 -04:00
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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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return atm_tc_get(sch, classid);
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2005-04-16 18:20:36 -04:00
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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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2007-07-15 03:01:25 -04:00
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struct atm_flow_data *flow = (struct atm_flow_data *)cl;
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2005-04-16 18:20:36 -04:00
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struct atm_flow_data **prev;
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
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2007-07-15 03:01:25 -04:00
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if (--flow->ref)
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return;
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_put: destroying\n");
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2005-04-16 18:20:36 -04:00
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for (prev = &p->flows; *prev; prev = &(*prev)->next)
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2007-07-15 03:01:25 -04:00
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if (*prev == flow)
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break;
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if (!*prev) {
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2007-07-15 03:01:25 -04:00
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printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
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2005-04-16 18:20:36 -04:00
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return;
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}
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*prev = flow->next;
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_put: qdisc %p\n", flow->q);
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2005-04-16 18:20:36 -04:00
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qdisc_destroy(flow->q);
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2008-07-01 22:52:38 -04:00
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tcf_destroy_chain(&flow->filter_list);
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2005-04-16 18:20:36 -04:00
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if (flow->sock) {
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2008-07-26 00:39:17 -04:00
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pr_debug("atm_tc_put: f_count %ld\n",
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2007-07-15 03:01:25 -04:00
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file_count(flow->sock->file));
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2005-04-16 18:20:36 -04:00
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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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2007-07-15 03:01:25 -04:00
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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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2005-04-16 18:20:36 -04:00
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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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2007-07-15 03:01:25 -04:00
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static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
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2005-04-16 18:20:36 -04:00
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{
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struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
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2008-01-21 05:25:29 -05:00
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pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
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2007-07-15 03:01:25 -04:00
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VCC2FLOW(vcc)->old_pop(vcc, skb);
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2005-04-16 18:20:36 -04:00
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tasklet_schedule(&p->task);
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}
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static const u8 llc_oui_ip[] = {
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2007-07-15 03:01:25 -04:00
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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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2005-04-16 18:20:36 -04:00
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0x00, 0x00,
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2007-07-15 03:01:25 -04:00
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0x08, 0x00
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}; /* Ethertype IP (0800) */
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2005-04-16 18:20:36 -04:00
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2008-01-23 23:35:39 -05:00
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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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2005-04-16 18:20:36 -04:00
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static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
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2008-01-23 01:11:17 -05:00
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struct nlattr **tca, unsigned long *arg)
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2005-04-16 18:20:36 -04:00
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{
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2008-01-21 05:25:29 -05:00
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struct atm_qdisc_data *p = qdisc_priv(sch);
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2007-07-15 03:01:25 -04:00
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struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
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2005-04-16 18:20:36 -04:00
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struct atm_flow_data *excess = NULL;
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2008-01-23 01:11:17 -05:00
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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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2005-04-16 18:20:36 -04:00
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struct socket *sock;
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2007-07-15 03:01:25 -04:00
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int fd, error, hdr_len;
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2005-04-16 18:20:36 -04:00
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void *hdr;
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
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2007-07-15 03:01:25 -04:00
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"flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
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2005-04-16 18:20:36 -04:00
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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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2007-07-15 03:01:25 -04:00
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if (flow)
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return -EBUSY;
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2008-01-23 23:33:32 -05:00
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if (opt == NULL)
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2005-04-16 18:20:36 -04:00
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return -EINVAL;
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2008-01-23 23:35:39 -05:00
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error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
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2008-01-23 23:33:32 -05:00
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if (error < 0)
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return error;
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2008-01-23 23:35:39 -05:00
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if (!tb[TCA_ATM_FD])
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2005-04-16 18:20:36 -04:00
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return -EINVAL;
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2008-01-23 23:35:03 -05:00
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fd = nla_get_u32(tb[TCA_ATM_FD]);
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2008-01-21 05:25:29 -05:00
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pr_debug("atm_tc_change: fd %d\n", fd);
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2008-01-23 01:11:17 -05:00
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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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2007-07-15 03:01:25 -04:00
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} else {
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2005-04-16 18:20:36 -04:00
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hdr_len = RFC1483LLC_LEN;
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2007-07-15 03:01:25 -04:00
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hdr = NULL; /* default LLC/SNAP for IP */
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2005-04-16 18:20:36 -04:00
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}
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2008-01-23 01:11:17 -05:00
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if (!tb[TCA_ATM_EXCESS])
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2007-07-15 03:01:25 -04:00
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excess = NULL;
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2005-04-16 18:20:36 -04:00
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else {
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2007-07-15 03:01:25 -04:00
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excess = (struct atm_flow_data *)
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2008-01-23 23:35:03 -05:00
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atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
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2007-07-15 03:01:25 -04:00
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if (!excess)
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return -ENOENT;
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2005-04-16 18:20:36 -04:00
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}
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2008-01-23 23:32:06 -05:00
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pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
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2008-01-23 01:11:17 -05:00
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opt->nla_type, nla_len(opt), hdr_len);
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2008-01-21 05:25:29 -05:00
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sock = sockfd_lookup(fd, &error);
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if (!sock)
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2007-07-15 03:01:25 -04:00
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return error; /* f_count++ */
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2008-07-26 00:39:17 -04:00
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|
|
pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
|
2007-02-09 09:25:16 -05:00
|
|
|
if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
|
2005-04-16 18:20:36 -04:00
|
|
|
error = -EPROTOTYPE;
|
2007-02-09 09:25:16 -05:00
|
|
|
goto err_out;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
/* @@@ should check if the socket is really operational or we'll crash
|
|
|
|
on vcc->send */
|
|
|
|
if (classid) {
|
|
|
|
if (TC_H_MAJ(classid ^ sch->handle)) {
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_change: classid mismatch\n");
|
2005-04-16 18:20:36 -04:00
|
|
|
error = -EINVAL;
|
|
|
|
goto err_out;
|
|
|
|
}
|
2007-07-15 03:01:25 -04:00
|
|
|
if (find_flow(p, flow)) {
|
2005-04-16 18:20:36 -04:00
|
|
|
error = -EEXIST;
|
|
|
|
goto err_out;
|
|
|
|
}
|
2007-07-15 03:01:25 -04:00
|
|
|
} else {
|
2005-04-16 18:20:36 -04:00
|
|
|
int i;
|
|
|
|
unsigned long cl;
|
|
|
|
|
|
|
|
for (i = 1; i < 0x8000; i++) {
|
2007-07-15 03:01:25 -04:00
|
|
|
classid = TC_H_MAKE(sch->handle, 0x8000 | i);
|
2008-01-21 05:25:29 -05:00
|
|
|
cl = atm_tc_get(sch, classid);
|
|
|
|
if (!cl)
|
2007-07-15 03:01:25 -04:00
|
|
|
break;
|
|
|
|
atm_tc_put(sch, cl);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
}
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_change: new id %x\n", classid);
|
2007-07-16 21:30:36 -04:00
|
|
|
flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_change: flow %p\n", flow);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (!flow) {
|
|
|
|
error = -ENOBUFS;
|
|
|
|
goto err_out;
|
|
|
|
}
|
|
|
|
flow->filter_list = NULL;
|
2008-07-08 20:06:30 -04:00
|
|
|
flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
|
2008-07-08 19:55:56 -04:00
|
|
|
&pfifo_qdisc_ops, classid);
|
2008-01-21 05:25:29 -05:00
|
|
|
if (!flow->q)
|
2005-04-16 18:20:36 -04:00
|
|
|
flow->q = &noop_qdisc;
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_change: qdisc %p\n", flow->q);
|
2005-04-16 18:20:36 -04:00
|
|
|
flow->sock = sock;
|
2007-07-15 03:01:25 -04:00
|
|
|
flow->vcc = ATM_SD(sock); /* speedup */
|
2005-04-16 18:20:36 -04:00
|
|
|
flow->vcc->user_back = flow;
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
|
2005-04-16 18:20:36 -04:00
|
|
|
flow->old_pop = flow->vcc->pop;
|
|
|
|
flow->parent = p;
|
|
|
|
flow->vcc->pop = sch_atm_pop;
|
|
|
|
flow->classid = classid;
|
|
|
|
flow->ref = 1;
|
|
|
|
flow->excess = excess;
|
|
|
|
flow->next = p->link.next;
|
|
|
|
p->link.next = flow;
|
|
|
|
flow->hdr_len = hdr_len;
|
|
|
|
if (hdr)
|
2007-07-15 03:01:25 -04:00
|
|
|
memcpy(flow->hdr, hdr, hdr_len);
|
2005-04-16 18:20:36 -04:00
|
|
|
else
|
2007-07-15 03:01:25 -04:00
|
|
|
memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
|
|
|
|
*arg = (unsigned long)flow;
|
2005-04-16 18:20:36 -04:00
|
|
|
return 0;
|
|
|
|
err_out:
|
2007-07-15 03:01:25 -04:00
|
|
|
if (excess)
|
|
|
|
atm_tc_put(sch, (unsigned long)excess);
|
2005-04-16 18:20:36 -04:00
|
|
|
sockfd_put(sock);
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
2007-07-15 03:01:25 -04:00
|
|
|
static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2007-07-15 03:01:25 -04:00
|
|
|
struct atm_flow_data *flow = (struct atm_flow_data *)arg;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
|
|
|
|
if (!find_flow(qdisc_priv(sch), flow))
|
2007-07-15 03:01:25 -04:00
|
|
|
return -EINVAL;
|
|
|
|
if (flow->filter_list || flow == &p->link)
|
|
|
|
return -EBUSY;
|
2005-04-16 18:20:36 -04:00
|
|
|
/*
|
|
|
|
* Reference count must be 2: one for "keepalive" (set at class
|
|
|
|
* creation), and one for the reference held when calling delete.
|
|
|
|
*/
|
|
|
|
if (flow->ref < 2) {
|
2007-07-15 03:01:25 -04:00
|
|
|
printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
|
2005-04-16 18:20:36 -04:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
2007-07-15 03:01:25 -04:00
|
|
|
if (flow->ref > 2)
|
|
|
|
return -EBUSY; /* catch references via excess, etc. */
|
|
|
|
atm_tc_put(sch, arg);
|
2005-04-16 18:20:36 -04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-07-15 03:01:25 -04:00
|
|
|
static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct atm_flow_data *flow;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
|
2007-07-15 03:01:25 -04:00
|
|
|
if (walker->stop)
|
|
|
|
return;
|
2005-04-16 18:20:36 -04:00
|
|
|
for (flow = p->flows; flow; flow = flow->next) {
|
|
|
|
if (walker->count >= walker->skip)
|
2007-07-15 03:01:25 -04:00
|
|
|
if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
|
2005-04-16 18:20:36 -04:00
|
|
|
walker->stop = 1;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
walker->count++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-07-15 03:01:25 -04:00
|
|
|
static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2007-07-15 03:01:25 -04:00
|
|
|
struct atm_flow_data *flow = (struct atm_flow_data *)cl;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
|
2007-02-09 09:25:16 -05:00
|
|
|
return flow ? &flow->filter_list : &p->link.filter_list;
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
|
|
|
/* --------------------------- Qdisc operations ---------------------------- */
|
|
|
|
|
2007-07-15 03:01:25 -04:00
|
|
|
static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2007-07-15 03:01:25 -04:00
|
|
|
struct atm_flow_data *flow = NULL; /* @@@ */
|
2005-04-16 18:20:36 -04:00
|
|
|
struct tcf_result res;
|
|
|
|
int result;
|
|
|
|
int ret = NET_XMIT_POLICED;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
|
2007-07-15 03:01:25 -04:00
|
|
|
result = TC_POLICE_OK; /* be nice to gcc */
|
2005-04-16 18:20:36 -04:00
|
|
|
if (TC_H_MAJ(skb->priority) != sch->handle ||
|
2007-07-15 03:01:25 -04:00
|
|
|
!(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
|
2005-04-16 18:20:36 -04:00
|
|
|
for (flow = p->flows; flow; flow = flow->next)
|
|
|
|
if (flow->filter_list) {
|
2007-07-15 03:02:31 -04:00
|
|
|
result = tc_classify_compat(skb,
|
|
|
|
flow->filter_list,
|
|
|
|
&res);
|
2007-07-15 03:01:25 -04:00
|
|
|
if (result < 0)
|
|
|
|
continue;
|
|
|
|
flow = (struct atm_flow_data *)res.class;
|
|
|
|
if (!flow)
|
|
|
|
flow = lookup_flow(sch, res.classid);
|
2005-04-16 18:20:36 -04:00
|
|
|
break;
|
|
|
|
}
|
2007-07-15 03:01:25 -04:00
|
|
|
if (!flow)
|
|
|
|
flow = &p->link;
|
2005-04-16 18:20:36 -04:00
|
|
|
else {
|
|
|
|
if (flow->vcc)
|
|
|
|
ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
|
2007-07-15 03:01:25 -04:00
|
|
|
/*@@@ looks good ... but it's not supposed to work :-) */
|
2007-07-15 03:01:49 -04:00
|
|
|
#ifdef CONFIG_NET_CLS_ACT
|
|
|
|
switch (result) {
|
|
|
|
case TC_ACT_QUEUED:
|
|
|
|
case TC_ACT_STOLEN:
|
|
|
|
kfree_skb(skb);
|
|
|
|
return NET_XMIT_SUCCESS;
|
|
|
|
case TC_ACT_SHOT:
|
|
|
|
kfree_skb(skb);
|
|
|
|
goto drop;
|
2007-07-15 03:02:31 -04:00
|
|
|
case TC_POLICE_RECLASSIFY:
|
|
|
|
if (flow->excess)
|
|
|
|
flow = flow->excess;
|
|
|
|
else
|
|
|
|
ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
|
|
|
|
break;
|
2007-07-15 03:01:49 -04:00
|
|
|
}
|
2005-04-16 18:20:36 -04:00
|
|
|
#endif
|
|
|
|
}
|
2007-07-15 03:03:05 -04:00
|
|
|
|
2008-07-20 03:08:04 -04:00
|
|
|
ret = qdisc_enqueue(skb, flow->q);
|
2008-01-21 05:25:29 -05:00
|
|
|
if (ret != 0) {
|
2007-07-15 03:01:49 -04:00
|
|
|
drop: __maybe_unused
|
2005-04-16 18:20:36 -04:00
|
|
|
sch->qstats.drops++;
|
2007-07-15 03:01:25 -04:00
|
|
|
if (flow)
|
|
|
|
flow->qstats.drops++;
|
2005-04-16 18:20:36 -04:00
|
|
|
return ret;
|
|
|
|
}
|
2008-07-20 03:08:27 -04:00
|
|
|
sch->bstats.bytes += qdisc_pkt_len(skb);
|
2005-04-16 18:20:36 -04:00
|
|
|
sch->bstats.packets++;
|
2008-07-20 03:08:27 -04:00
|
|
|
flow->bstats.bytes += qdisc_pkt_len(skb);
|
2005-04-16 18:20:36 -04:00
|
|
|
flow->bstats.packets++;
|
|
|
|
/*
|
|
|
|
* Okay, this may seem weird. We pretend we've dropped the packet if
|
|
|
|
* it goes via ATM. The reason for this is that the outer qdisc
|
|
|
|
* expects to be able to q->dequeue the packet later on if we return
|
|
|
|
* success at this place. Also, sch->q.qdisc needs to reflect whether
|
|
|
|
* there is a packet egligible for dequeuing or not. Note that the
|
|
|
|
* statistics of the outer qdisc are necessarily wrong because of all
|
|
|
|
* this. There's currently no correct solution for this.
|
|
|
|
*/
|
|
|
|
if (flow == &p->link) {
|
|
|
|
sch->q.qlen++;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
tasklet_schedule(&p->task);
|
|
|
|
return NET_XMIT_BYPASS;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Dequeue packets and send them over ATM. Note that we quite deliberately
|
|
|
|
* avoid checking net_device's flow control here, simply because sch_atm
|
|
|
|
* uses its own channels, which have nothing to do with any CLIP/LANE/or
|
|
|
|
* non-ATM interfaces.
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void sch_atm_dequeue(unsigned long data)
|
|
|
|
{
|
2007-07-15 03:01:25 -04:00
|
|
|
struct Qdisc *sch = (struct Qdisc *)data;
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct atm_flow_data *flow;
|
|
|
|
struct sk_buff *skb;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
|
2005-04-16 18:20:36 -04:00
|
|
|
for (flow = p->link.next; flow; flow = flow->next)
|
|
|
|
/*
|
|
|
|
* If traffic is properly shaped, this won't generate nasty
|
|
|
|
* little bursts. Otherwise, it may ... (but that's okay)
|
|
|
|
*/
|
|
|
|
while ((skb = flow->q->dequeue(flow->q))) {
|
2007-07-15 03:01:25 -04:00
|
|
|
if (!atm_may_send(flow->vcc, skb->truesize)) {
|
|
|
|
(void)flow->q->ops->requeue(skb, flow->q);
|
2005-04-16 18:20:36 -04:00
|
|
|
break;
|
|
|
|
}
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
|
2005-04-16 18:20:36 -04:00
|
|
|
/* remove any LL header somebody else has attached */
|
2007-04-21 01:47:35 -04:00
|
|
|
skb_pull(skb, skb_network_offset(skb));
|
2005-04-16 18:20:36 -04:00
|
|
|
if (skb_headroom(skb) < flow->hdr_len) {
|
|
|
|
struct sk_buff *new;
|
|
|
|
|
2007-07-15 03:01:25 -04:00
|
|
|
new = skb_realloc_headroom(skb, flow->hdr_len);
|
2005-04-16 18:20:36 -04:00
|
|
|
dev_kfree_skb(skb);
|
2007-07-15 03:01:25 -04:00
|
|
|
if (!new)
|
|
|
|
continue;
|
2005-04-16 18:20:36 -04:00
|
|
|
skb = new;
|
|
|
|
}
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("sch_atm_dequeue: ip %p, data %p\n",
|
2007-04-21 01:47:35 -04:00
|
|
|
skb_network_header(skb), skb->data);
|
2005-04-16 18:20:36 -04:00
|
|
|
ATM_SKB(skb)->vcc = flow->vcc;
|
2007-07-15 03:01:25 -04:00
|
|
|
memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
|
|
|
|
flow->hdr_len);
|
2005-04-16 18:20:36 -04:00
|
|
|
atomic_add(skb->truesize,
|
|
|
|
&sk_atm(flow->vcc)->sk_wmem_alloc);
|
|
|
|
/* atm.atm_options are already set by atm_tc_enqueue */
|
2007-07-15 03:01:25 -04:00
|
|
|
flow->vcc->send(flow->vcc, skb);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
|
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct sk_buff *skb;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
|
2005-04-16 18:20:36 -04:00
|
|
|
tasklet_schedule(&p->task);
|
|
|
|
skb = p->link.q->dequeue(p->link.q);
|
2007-07-15 03:01:25 -04:00
|
|
|
if (skb)
|
|
|
|
sch->q.qlen--;
|
2005-04-16 18:20:36 -04:00
|
|
|
return skb;
|
|
|
|
}
|
|
|
|
|
2007-07-15 03:01:25 -04:00
|
|
|
static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
int ret;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
|
2007-07-15 03:01:25 -04:00
|
|
|
ret = p->link.q->ops->requeue(skb, p->link.q);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (!ret) {
|
2007-07-15 03:01:25 -04:00
|
|
|
sch->q.qlen++;
|
|
|
|
sch->qstats.requeues++;
|
|
|
|
} else {
|
2005-04-16 18:20:36 -04:00
|
|
|
sch->qstats.drops++;
|
|
|
|
p->link.qstats.drops++;
|
|
|
|
}
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int atm_tc_drop(struct Qdisc *sch)
|
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct atm_flow_data *flow;
|
|
|
|
unsigned int len;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
|
2005-04-16 18:20:36 -04:00
|
|
|
for (flow = p->flows; flow; flow = flow->next)
|
|
|
|
if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
|
|
|
|
return len;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-01-23 01:11:17 -05:00
|
|
|
static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
|
2005-04-16 18:20:36 -04:00
|
|
|
p->flows = &p->link;
|
2008-07-08 20:06:30 -04:00
|
|
|
p->link.q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
|
2008-07-08 19:55:56 -04:00
|
|
|
&pfifo_qdisc_ops, sch->handle);
|
2008-01-21 05:25:29 -05:00
|
|
|
if (!p->link.q)
|
2005-04-16 18:20:36 -04:00
|
|
|
p->link.q = &noop_qdisc;
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
|
2005-04-16 18:20:36 -04:00
|
|
|
p->link.filter_list = NULL;
|
|
|
|
p->link.vcc = NULL;
|
|
|
|
p->link.sock = NULL;
|
|
|
|
p->link.classid = sch->handle;
|
|
|
|
p->link.ref = 1;
|
|
|
|
p->link.next = NULL;
|
2007-07-15 03:01:25 -04:00
|
|
|
tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void atm_tc_reset(struct Qdisc *sch)
|
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct atm_flow_data *flow;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
|
2007-07-15 03:01:25 -04:00
|
|
|
for (flow = p->flows; flow; flow = flow->next)
|
|
|
|
qdisc_reset(flow->q);
|
2005-04-16 18:20:36 -04:00
|
|
|
sch->q.qlen = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void atm_tc_destroy(struct Qdisc *sch)
|
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2005-04-16 18:20:36 -04:00
|
|
|
struct atm_flow_data *flow;
|
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
|
2008-07-01 22:53:09 -04:00
|
|
|
for (flow = p->flows; flow; flow = flow->next)
|
|
|
|
tcf_destroy_chain(&flow->filter_list);
|
|
|
|
|
2005-04-16 18:20:36 -04:00
|
|
|
/* races ? */
|
|
|
|
while ((flow = p->flows)) {
|
|
|
|
if (flow->ref > 1)
|
2007-07-15 03:01:25 -04:00
|
|
|
printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
|
|
|
|
flow->ref);
|
|
|
|
atm_tc_put(sch, (unsigned long)flow);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (p->flows == flow) {
|
|
|
|
printk(KERN_ERR "atm_destroy: putting flow %p didn't "
|
2007-07-15 03:01:25 -04:00
|
|
|
"kill it\n", flow);
|
|
|
|
p->flows = flow->next; /* brute force */
|
2005-04-16 18:20:36 -04:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
tasklet_kill(&p->task);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
|
2007-07-15 03:01:25 -04:00
|
|
|
struct sk_buff *skb, struct tcmsg *tcm)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2008-01-21 05:25:29 -05:00
|
|
|
struct atm_qdisc_data *p = qdisc_priv(sch);
|
2007-07-15 03:01:25 -04:00
|
|
|
struct atm_flow_data *flow = (struct atm_flow_data *)cl;
|
2008-01-23 23:34:11 -05:00
|
|
|
struct nlattr *nest;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
2008-01-21 05:25:29 -05:00
|
|
|
pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
|
2007-07-15 03:01:25 -04:00
|
|
|
sch, p, flow, skb, tcm);
|
|
|
|
if (!find_flow(p, flow))
|
|
|
|
return -EINVAL;
|
2005-04-16 18:20:36 -04:00
|
|
|
tcm->tcm_handle = flow->classid;
|
2006-03-20 22:01:06 -05:00
|
|
|
tcm->tcm_info = flow->q->handle;
|
2008-01-23 23:34:11 -05:00
|
|
|
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
|
|
if (nest == NULL)
|
|
|
|
goto nla_put_failure;
|
|
|
|
|
2008-01-23 01:11:17 -05:00
|
|
|
NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (flow->vcc) {
|
|
|
|
struct sockaddr_atmpvc pvc;
|
|
|
|
int state;
|
|
|
|
|
|
|
|
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;
|
2008-01-23 01:11:17 -05:00
|
|
|
NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
|
2005-04-16 18:20:36 -04:00
|
|
|
state = ATM_VF2VS(flow->vcc->flags);
|
2008-01-23 23:34:48 -05:00
|
|
|
NLA_PUT_U32(skb, TCA_ATM_STATE, state);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
if (flow->excess)
|
2008-01-23 23:34:48 -05:00
|
|
|
NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
|
2005-04-16 18:20:36 -04:00
|
|
|
else {
|
2008-01-23 23:34:48 -05:00
|
|
|
NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
2008-01-23 23:34:11 -05:00
|
|
|
|
|
|
|
nla_nest_end(skb, nest);
|
2005-04-16 18:20:36 -04:00
|
|
|
return skb->len;
|
|
|
|
|
2008-01-23 01:11:17 -05:00
|
|
|
nla_put_failure:
|
2008-01-23 23:34:11 -05:00
|
|
|
nla_nest_cancel(skb, nest);
|
2005-04-16 18:20:36 -04:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
static int
|
|
|
|
atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
|
2007-07-15 03:01:25 -04:00
|
|
|
struct gnet_dump *d)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
2007-07-15 03:01:25 -04:00
|
|
|
struct atm_flow_data *flow = (struct atm_flow_data *)arg;
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
flow->qstats.qlen = flow->q->q.qlen;
|
|
|
|
|
|
|
|
if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
|
|
|
|
gnet_stats_copy_queue(d, &flow->qstats) < 0)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-11-14 04:44:41 -05:00
|
|
|
static const struct Qdisc_class_ops atm_class_ops = {
|
2007-07-15 03:01:25 -04:00
|
|
|
.graft = atm_tc_graft,
|
|
|
|
.leaf = atm_tc_leaf,
|
|
|
|
.get = atm_tc_get,
|
|
|
|
.put = atm_tc_put,
|
|
|
|
.change = atm_tc_change,
|
|
|
|
.delete = atm_tc_delete,
|
|
|
|
.walk = atm_tc_walk,
|
|
|
|
.tcf_chain = atm_tc_find_tcf,
|
|
|
|
.bind_tcf = atm_tc_bind_filter,
|
|
|
|
.unbind_tcf = atm_tc_put,
|
|
|
|
.dump = atm_tc_dump_class,
|
|
|
|
.dump_stats = atm_tc_dump_class_stats,
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|
|
|
|
|
2007-11-14 04:44:41 -05:00
|
|
|
static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
|
2007-07-15 03:01:25 -04:00
|
|
|
.cl_ops = &atm_class_ops,
|
|
|
|
.id = "atm",
|
|
|
|
.priv_size = sizeof(struct atm_qdisc_data),
|
|
|
|
.enqueue = atm_tc_enqueue,
|
|
|
|
.dequeue = atm_tc_dequeue,
|
|
|
|
.requeue = atm_tc_requeue,
|
|
|
|
.drop = atm_tc_drop,
|
|
|
|
.init = atm_tc_init,
|
|
|
|
.reset = atm_tc_reset,
|
|
|
|
.destroy = atm_tc_destroy,
|
|
|
|
.dump = atm_tc_dump,
|
|
|
|
.owner = THIS_MODULE,
|
2005-04-16 18:20:36 -04:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init atm_init(void)
|
|
|
|
{
|
|
|
|
return register_qdisc(&atm_qdisc_ops);
|
|
|
|
}
|
|
|
|
|
2007-02-09 09:25:16 -05:00
|
|
|
static void __exit atm_exit(void)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
unregister_qdisc(&atm_qdisc_ops);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(atm_init)
|
|
|
|
module_exit(atm_exit)
|
|
|
|
MODULE_LICENSE("GPL");
|