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/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/atmdev.h>
#include <linux/atmclip.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/file.h> /* for fput */
#include <net/pkt_sched.h>
#include <net/sock.h>
extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
#define sockfd_put(sock) fput((sock)->file) /* @@@ copied because it's
__inline__ in socket.c */
#if 0 /* control */
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif
#if 0 /* data */
#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define D2PRINTK(format,args...)
#endif
/*
* The ATM queuing discipline provides a framework for invoking classifiers
* (aka "filters"), which in turn select classes of this queuing discipline.
* Each class maps the flow(s) it is handling to a given VC. Multiple classes
* may share the same VC.
*
* When creating a class, VCs are specified by passing the number of the open
* socket descriptor by which the calling process references the VC. The kernel
* keeps the VC open at least until all classes using it are removed.
*
* In this file, most functions are named atm_tc_* to avoid confusion with all
* the atm_* in net/atm. This naming convention differs from what's used in the
* rest of net/sched.
*
* Known bugs:
* - sometimes messes up the IP stack
* - any manipulations besides the few operations described in the README, are
* untested and likely to crash the system
* - should lock the flow while there is data in the queue (?)
*/
#define PRIV(sch) ((struct atm_qdisc_data *) (sch)->data)
#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
struct atm_flow_data {
struct Qdisc *q; /* FIFO, TBF, etc. */
struct tcf_proto *filter_list;
struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* chaining */
struct atm_qdisc_data *parent; /* parent qdisc */
struct socket *sock; /* for closing */
u32 classid; /* x:y type ID */
int ref; /* reference count */
struct tc_stats stats;
struct atm_flow_data *next;
struct atm_flow_data *excess; /* flow for excess traffic;
NULL to set CLP instead */
int hdr_len;
unsigned char hdr[0]; /* header data; MUST BE LAST */
};
struct atm_qdisc_data {
struct atm_flow_data link; /* unclassified skbs go here */
struct atm_flow_data *flows; /* NB: "link" is also on this
list */
struct tasklet_struct task; /* requeue tasklet */
};
/* ------------------------- Class/flow operations ------------------------- */
static int find_flow(struct atm_qdisc_data *qdisc,struct atm_flow_data *flow)
{
struct atm_flow_data *walk;
DPRINTK("find_flow(qdisc %p,flow %p)\n",qdisc,flow);
for (walk = qdisc->flows; walk; walk = walk->next)
if (walk == flow) return 1;
DPRINTK("find_flow: not found\n");
return 0;
}
static __inline__ struct atm_flow_data *lookup_flow(struct Qdisc *sch,
u32 classid)
{
struct atm_flow_data *flow;
for (flow = PRIV(sch)->flows; flow; flow = flow->next)
if (flow->classid == classid) break;
return flow;
}
static int atm_tc_graft(struct Qdisc *sch,unsigned long arg,
struct Qdisc *new,struct Qdisc **old)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow = (struct atm_flow_data *) arg;
DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",sch,
p,flow,new,old);
if (!find_flow(p,flow)) return -EINVAL;
if (!new) new = &noop_qdisc;
*old = xchg(&flow->q,new);
if (*old) qdisc_reset(*old);
return 0;
}
static struct Qdisc *atm_tc_leaf(struct Qdisc *sch,unsigned long cl)
{
struct atm_flow_data *flow = (struct atm_flow_data *) cl;
DPRINTK("atm_tc_leaf(sch %p,flow %p)\n",sch,flow);
return flow ? flow->q : NULL;
}
static unsigned long atm_tc_get(struct Qdisc *sch,u32 classid)
{
struct atm_qdisc_data *p __attribute__((unused)) = PRIV(sch);
struct atm_flow_data *flow;
DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
flow = lookup_flow(sch,classid);
if (flow) flow->ref++;
DPRINTK("atm_tc_get: flow %p\n",flow);
return (unsigned long) flow;
}
static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
unsigned long parent, u32 classid)
{
return atm_tc_get(sch,classid);
}
static void destroy_filters(struct atm_flow_data *flow)
{
struct tcf_proto *filter;
while ((filter = flow->filter_list)) {
DPRINTK("destroy_filters: destroying filter %p\n",filter);
flow->filter_list = filter->next;
filter->ops->destroy(filter);
}
}
/*
* atm_tc_put handles all destructions, including the ones that are explicitly
* requested (atm_tc_destroy, etc.). The assumption here is that we never drop
* anything that still seems to be in use.
*/
static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow = (struct atm_flow_data *) cl;
struct atm_flow_data **prev;
DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
if (--flow->ref) return;
DPRINTK("atm_tc_put: destroying\n");
for (prev = &p->flows; *prev; prev = &(*prev)->next)
if (*prev == flow) break;
if (!*prev) {
printk(KERN_CRIT "atm_tc_put: class %p not found\n",flow);
return;
}
*prev = flow->next;
DPRINTK("atm_tc_put: qdisc %p\n",flow->q);
qdisc_destroy(flow->q);
destroy_filters(flow);
if (flow->sock) {
DPRINTK("atm_tc_put: f_count %d\n",
file_count(flow->sock->file));
flow->vcc->pop = flow->old_pop;
sockfd_put(flow->sock);
}
if (flow->excess) atm_tc_put(sch,(unsigned long) flow->excess);
if (flow != &p->link) kfree(flow);
/*
* If flow == &p->link, the qdisc no longer works at this point and
* needs to be removed. (By the caller of atm_tc_put.)
*/
}
static void sch_atm_pop(struct atm_vcc *vcc,struct sk_buff *skb)
{
struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n",vcc,skb,p);
VCC2FLOW(vcc)->old_pop(vcc,skb);
tasklet_schedule(&p->task);
}
static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
struct rtattr **tca, unsigned long *arg)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow = (struct atm_flow_data *) *arg;
struct atm_flow_data *excess = NULL;
struct rtattr *opt = tca[TCA_OPTIONS-1];
struct rtattr *tb[TCA_ATM_MAX];
struct socket *sock;
int fd,error,hdr_len;
void *hdr;
DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
"flow %p,opt %p)\n",sch,p,classid,parent,flow,opt);
/*
* The concept of parents doesn't apply for this qdisc.
*/
if (parent && parent != TC_H_ROOT && parent != sch->handle)
return -EINVAL;
/*
* ATM classes cannot be changed. In order to change properties of the
* ATM connection, that socket needs to be modified directly (via the
* native ATM API. In order to send a flow to a different VC, the old
* class needs to be removed and a new one added. (This may be changed
* later.)
*/
if (flow) return -EBUSY;
if (opt == NULL || rtattr_parse(tb,TCA_ATM_MAX,RTA_DATA(opt),
RTA_PAYLOAD(opt))) return -EINVAL;
if (!tb[TCA_ATM_FD-1] || RTA_PAYLOAD(tb[TCA_ATM_FD-1]) < sizeof(fd))
return -EINVAL;
fd = *(int *) RTA_DATA(tb[TCA_ATM_FD-1]);
DPRINTK("atm_tc_change: fd %d\n",fd);
if (tb[TCA_ATM_HDR-1]) {
hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR-1]);
hdr = RTA_DATA(tb[TCA_ATM_HDR-1]);
}
else {
hdr_len = RFC1483LLC_LEN;
hdr = NULL; /* default LLC/SNAP for IP */
}
if (!tb[TCA_ATM_EXCESS-1]) excess = NULL;
else {
if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS-1]) != sizeof(u32))
return -EINVAL;
excess = (struct atm_flow_data *) atm_tc_get(sch,
*(u32 *) RTA_DATA(tb[TCA_ATM_EXCESS-1]));
if (!excess) return -ENOENT;
}
DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
opt->rta_type,RTA_PAYLOAD(opt),hdr_len);
if (!(sock = sockfd_lookup(fd,&error))) return error; /* f_count++ */
DPRINTK("atm_tc_change: f_count %d\n",file_count(sock->file));
if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
error = -EPROTOTYPE;
goto err_out;
}
/* @@@ should check if the socket is really operational or we'll crash
on vcc->send */
if (classid) {
if (TC_H_MAJ(classid ^ sch->handle)) {
DPRINTK("atm_tc_change: classid mismatch\n");
error = -EINVAL;
goto err_out;
}
if (find_flow(p,flow)) {
error = -EEXIST;
goto err_out;
}
}
else {
int i;
unsigned long cl;
for (i = 1; i < 0x8000; i++) {
classid = TC_H_MAKE(sch->handle,0x8000 | i);
if (!(cl = atm_tc_get(sch,classid))) break;
atm_tc_put(sch,cl);
}
}
DPRINTK("atm_tc_change: new id %x\n",classid);
flow = kmalloc(sizeof(struct atm_flow_data)+hdr_len,GFP_KERNEL);
DPRINTK("atm_tc_change: flow %p\n",flow);
if (!flow) {
error = -ENOBUFS;
goto err_out;
}
memset(flow,0,sizeof(*flow));
flow->filter_list = NULL;
if (!(flow->q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops)))
flow->q = &noop_qdisc;
DPRINTK("atm_tc_change: qdisc %p\n",flow->q);
flow->sock = sock;
flow->vcc = ATM_SD(sock); /* speedup */
flow->vcc->user_back = flow;
DPRINTK("atm_tc_change: vcc %p\n",flow->vcc);
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) memcpy(flow->hdr,hdr,hdr_len);
else {
memcpy(flow->hdr,llc_oui,sizeof(llc_oui));
((u16 *) flow->hdr)[3] = htons(ETH_P_IP);
}
*arg = (unsigned long) flow;
return 0;
err_out:
if (excess) atm_tc_put(sch,(unsigned long) excess);
sockfd_put(sock);
return error;
}
static int atm_tc_delete(struct Qdisc *sch,unsigned long arg)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow = (struct atm_flow_data *) arg;
DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
if (!find_flow(PRIV(sch),flow)) return -EINVAL;
if (flow->filter_list || flow == &p->link) return -EBUSY;
/*
* 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) {
printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n",flow->ref);
return -EINVAL;
}
if (flow->ref > 2) return -EBUSY; /* catch references via excess, etc.*/
atm_tc_put(sch,arg);
return 0;
}
static void atm_tc_walk(struct Qdisc *sch,struct qdisc_walker *walker)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow;
DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
if (walker->stop) return;
for (flow = p->flows; flow; flow = flow->next) {
if (walker->count >= walker->skip)
if (walker->fn(sch,(unsigned long) flow,walker) < 0) {
walker->stop = 1;
break;
}
walker->count++;
}
}
static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch,unsigned long cl)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow = (struct atm_flow_data *) cl;
DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
return flow ? &flow->filter_list : &p->link.filter_list;
}
/* --------------------------- Qdisc operations ---------------------------- */
static int atm_tc_enqueue(struct sk_buff *skb,struct Qdisc *sch)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow = NULL ; /* @@@ */
struct tcf_result res;
int result;
int ret = NET_XMIT_POLICED;
D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
result = TC_POLICE_OK; /* be nice to gcc */
if (TC_H_MAJ(skb->priority) != sch->handle ||
!(flow = (struct atm_flow_data *) atm_tc_get(sch,skb->priority)))
for (flow = p->flows; flow; flow = flow->next)
if (flow->filter_list) {
result = tc_classify(skb,flow->filter_list,
&res);
if (result < 0) continue;
flow = (struct atm_flow_data *) res.class;
if (!flow) flow = lookup_flow(sch,res.classid);
break;
}
if (!flow) flow = &p->link;
else {
if (flow->vcc)
ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
/*@@@ looks good ... but it's not supposed to work :-)*/
#ifdef CONFIG_NET_CLS_POLICE
switch (result) {
case TC_POLICE_SHOT:
kfree_skb(skb);
break;
case TC_POLICE_RECLASSIFY:
if (flow->excess) flow = flow->excess;
else {
ATM_SKB(skb)->atm_options |=
ATM_ATMOPT_CLP;
break;
}
/* fall through */
case TC_POLICE_OK:
/* fall through */
default:
break;
}
#endif
}
if (
#ifdef CONFIG_NET_CLS_POLICE
result == TC_POLICE_SHOT ||
#endif
(ret = flow->q->enqueue(skb,flow->q)) != 0) {
sch->stats.drops++;
if (flow) flow->stats.drops++;
return ret;
}
sch->stats.bytes += skb->len;
sch->stats.packets++;
flow->stats.bytes += skb->len;
flow->stats.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)
{
struct Qdisc *sch = (struct Qdisc *) data;
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow;
struct sk_buff *skb;
D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n",sch,p);
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))) {
if (!atm_may_send(flow->vcc,skb->truesize)) {
(void) flow->q->ops->requeue(skb,flow->q);
break;
}
D2PRINTK("atm_tc_deqeueue: sending on class %p\n",flow);
/* remove any LL header somebody else has attached */
skb_pull(skb,(char *) skb->nh.iph-(char *) skb->data);
if (skb_headroom(skb) < flow->hdr_len) {
struct sk_buff *new;
new = skb_realloc_headroom(skb,flow->hdr_len);
dev_kfree_skb(skb);
if (!new) continue;
skb = new;
}
D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
skb->nh.iph,skb->data);
ATM_SKB(skb)->vcc = flow->vcc;
memcpy(skb_push(skb,flow->hdr_len),flow->hdr,
flow->hdr_len);
atomic_add(skb->truesize,&flow->vcc->tx_inuse);
ATM_SKB(skb)->iovcnt = 0;
/* atm.atm_options are already set by atm_tc_enqueue */
(void) flow->vcc->send(flow->vcc,skb);
}
}
static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
{
struct atm_qdisc_data *p = PRIV(sch);
struct sk_buff *skb;
D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n",sch,p);
tasklet_schedule(&p->task);
skb = p->link.q->dequeue(p->link.q);
if (skb) sch->q.qlen--;
return skb;
}
static int atm_tc_requeue(struct sk_buff *skb,struct Qdisc *sch)
{
struct atm_qdisc_data *p = PRIV(sch);
int ret;
D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
ret = p->link.q->ops->requeue(skb,p->link.q);
if (!ret) sch->q.qlen++;
else {
sch->stats.drops++;
p->link.stats.drops++;
}
return ret;
}
static int atm_tc_drop(struct Qdisc *sch)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow;
DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n",sch,p);
for (flow = p->flows; flow; flow = flow->next)
if (flow->q->ops->drop && flow->q->ops->drop(flow->q))
return 1;
return 0;
}
static int atm_tc_init(struct Qdisc *sch,struct rtattr *opt)
{
struct atm_qdisc_data *p = PRIV(sch);
DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
memset(p,0,sizeof(*p));
p->flows = &p->link;
if(!(p->link.q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops)))
p->link.q = &noop_qdisc;
DPRINTK("atm_tc_init: link (%p) qdisc %p\n",&p->link,p->link.q);
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;
tasklet_init(&p->task,sch_atm_dequeue,(unsigned long) sch);
MOD_INC_USE_COUNT;
return 0;
}
static void atm_tc_reset(struct Qdisc *sch)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow;
DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n",sch,p);
for (flow = p->flows; flow; flow = flow->next) qdisc_reset(flow->q);
sch->q.qlen = 0;
}
static void atm_tc_destroy(struct Qdisc *sch)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow;
DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n",sch,p);
/* races ? */
while ((flow = p->flows)) {
destroy_filters(flow);
if (flow->ref > 1)
printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
flow->ref);
atm_tc_put(sch,(unsigned long) flow);
if (p->flows == flow) {
printk(KERN_ERR "atm_destroy: putting flow %p didn't "
"kill it\n",flow);
p->flows = flow->next; /* brute force */
break;
}
}
tasklet_kill(&p->task);
MOD_DEC_USE_COUNT;
}
static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
struct atm_qdisc_data *p = PRIV(sch);
struct atm_flow_data *flow = (struct atm_flow_data *) cl;
unsigned char *b = skb->tail;
struct rtattr *rta;
DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
sch,p,flow,skb,tcm);
if (!find_flow(p,flow)) return -EINVAL;
tcm->tcm_handle = flow->classid;
rta = (struct rtattr *) b;
RTA_PUT(skb,TCA_OPTIONS,0,NULL);
RTA_PUT(skb,TCA_ATM_HDR,flow->hdr_len,flow->hdr);
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;
RTA_PUT(skb,TCA_ATM_ADDR,sizeof(pvc),&pvc);
state = ATM_VF2VS(flow->vcc->flags);
RTA_PUT(skb,TCA_ATM_STATE,sizeof(state),&state);
}
if (flow->excess)
RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(u32),&flow->classid);
else {
static u32 zero = 0;
RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero);
}
rta->rta_len = skb->tail-b;
return skb->len;
rtattr_failure:
skb_trim(skb,b-skb->data);
return -1;
}
static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
{
return 0;
}
static struct Qdisc_class_ops atm_class_ops =
{
atm_tc_graft, /* graft */
atm_tc_leaf, /* leaf */
atm_tc_get, /* get */
atm_tc_put, /* put */
atm_tc_change, /* change */
atm_tc_delete, /* delete */
atm_tc_walk, /* walk */
atm_tc_find_tcf, /* tcf_chain */
atm_tc_bind_filter, /* bind_tcf */
atm_tc_put, /* unbind_tcf */
atm_tc_dump_class, /* dump */
};
struct Qdisc_ops atm_qdisc_ops =
{
NULL, /* next */
&atm_class_ops, /* cl_ops */
"atm",
sizeof(struct atm_qdisc_data),
atm_tc_enqueue, /* enqueue */
atm_tc_dequeue, /* dequeue */
atm_tc_requeue, /* requeue */
atm_tc_drop, /* drop */
atm_tc_init, /* init */
atm_tc_reset, /* reset */
atm_tc_destroy, /* destroy */
NULL, /* change */
atm_tc_dump /* dump */
};
#ifdef MODULE
int init_module(void)
{
return register_qdisc(&atm_qdisc_ops);
}
void cleanup_module(void)
{
unregister_qdisc(&atm_qdisc_ops);
}
#endif
|