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OpenCloudOS-Kernel/net/802/mrp.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* IEEE 802.1Q Multiple Registration Protocol (MRP)
*
* Copyright (c) 2012 Massachusetts Institute of Technology
*
* Adapted from code in net/802/garp.c
* Copyright (c) 2008 Patrick McHardy <kaber@trash.net>
*/
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <net/mrp.h>
#include <asm/unaligned.h>
static unsigned int mrp_join_time __read_mostly = 200;
module_param(mrp_join_time, uint, 0644);
MODULE_PARM_DESC(mrp_join_time, "Join time in ms (default 200ms)");
static unsigned int mrp_periodic_time __read_mostly = 1000;
module_param(mrp_periodic_time, uint, 0644);
MODULE_PARM_DESC(mrp_periodic_time, "Periodic time in ms (default 1s)");
MODULE_LICENSE("GPL");
static const u8
mrp_applicant_state_table[MRP_APPLICANT_MAX + 1][MRP_EVENT_MAX + 1] = {
[MRP_APPLICANT_VO] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_VP,
[MRP_EVENT_LV] = MRP_APPLICANT_VO,
[MRP_EVENT_TX] = MRP_APPLICANT_VO,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_VO,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AO,
[MRP_EVENT_R_IN] = MRP_APPLICANT_VO,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VO,
[MRP_EVENT_R_MT] = MRP_APPLICANT_VO,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_VO,
},
[MRP_APPLICANT_VP] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_VP,
[MRP_EVENT_LV] = MRP_APPLICANT_VO,
[MRP_EVENT_TX] = MRP_APPLICANT_AA,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_VP,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AP,
[MRP_EVENT_R_IN] = MRP_APPLICANT_VP,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VP,
[MRP_EVENT_R_MT] = MRP_APPLICANT_VP,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_VP,
},
[MRP_APPLICANT_VN] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_VN,
[MRP_EVENT_LV] = MRP_APPLICANT_LA,
[MRP_EVENT_TX] = MRP_APPLICANT_AN,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_VN,
[MRP_EVENT_R_IN] = MRP_APPLICANT_VN,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_VN,
[MRP_EVENT_R_MT] = MRP_APPLICANT_VN,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VN,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VN,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VN,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_VN,
},
[MRP_APPLICANT_AN] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_AN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_AN,
[MRP_EVENT_LV] = MRP_APPLICANT_LA,
[MRP_EVENT_TX] = MRP_APPLICANT_QA,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_AN,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_AN,
[MRP_EVENT_R_IN] = MRP_APPLICANT_AN,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AN,
[MRP_EVENT_R_MT] = MRP_APPLICANT_AN,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VN,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VN,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VN,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AN,
},
[MRP_APPLICANT_AA] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_AA,
[MRP_EVENT_LV] = MRP_APPLICANT_LA,
[MRP_EVENT_TX] = MRP_APPLICANT_QA,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_AA,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QA,
[MRP_EVENT_R_IN] = MRP_APPLICANT_AA,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AA,
[MRP_EVENT_R_MT] = MRP_APPLICANT_AA,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AA,
},
[MRP_APPLICANT_QA] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_QA,
[MRP_EVENT_LV] = MRP_APPLICANT_LA,
[MRP_EVENT_TX] = MRP_APPLICANT_QA,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_QA,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QA,
[MRP_EVENT_R_IN] = MRP_APPLICANT_QA,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AA,
[MRP_EVENT_R_MT] = MRP_APPLICANT_AA,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AA,
},
[MRP_APPLICANT_LA] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_AA,
[MRP_EVENT_LV] = MRP_APPLICANT_LA,
[MRP_EVENT_TX] = MRP_APPLICANT_VO,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_LA,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_LA,
[MRP_EVENT_R_IN] = MRP_APPLICANT_LA,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_LA,
[MRP_EVENT_R_MT] = MRP_APPLICANT_LA,
[MRP_EVENT_R_LV] = MRP_APPLICANT_LA,
[MRP_EVENT_R_LA] = MRP_APPLICANT_LA,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_LA,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_LA,
},
[MRP_APPLICANT_AO] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_AP,
[MRP_EVENT_LV] = MRP_APPLICANT_AO,
[MRP_EVENT_TX] = MRP_APPLICANT_AO,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_AO,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QO,
[MRP_EVENT_R_IN] = MRP_APPLICANT_AO,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AO,
[MRP_EVENT_R_MT] = MRP_APPLICANT_AO,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AO,
},
[MRP_APPLICANT_QO] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_QP,
[MRP_EVENT_LV] = MRP_APPLICANT_QO,
[MRP_EVENT_TX] = MRP_APPLICANT_QO,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_QO,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QO,
[MRP_EVENT_R_IN] = MRP_APPLICANT_QO,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AO,
[MRP_EVENT_R_MT] = MRP_APPLICANT_AO,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VO,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VO,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VO,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_QO,
},
[MRP_APPLICANT_AP] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_AP,
[MRP_EVENT_LV] = MRP_APPLICANT_AO,
[MRP_EVENT_TX] = MRP_APPLICANT_QA,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_AP,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QP,
[MRP_EVENT_R_IN] = MRP_APPLICANT_AP,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AP,
[MRP_EVENT_R_MT] = MRP_APPLICANT_AP,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AP,
},
[MRP_APPLICANT_QP] = {
[MRP_EVENT_NEW] = MRP_APPLICANT_VN,
[MRP_EVENT_JOIN] = MRP_APPLICANT_QP,
[MRP_EVENT_LV] = MRP_APPLICANT_QO,
[MRP_EVENT_TX] = MRP_APPLICANT_QP,
[MRP_EVENT_R_NEW] = MRP_APPLICANT_QP,
[MRP_EVENT_R_JOIN_IN] = MRP_APPLICANT_QP,
[MRP_EVENT_R_IN] = MRP_APPLICANT_QP,
[MRP_EVENT_R_JOIN_MT] = MRP_APPLICANT_AP,
[MRP_EVENT_R_MT] = MRP_APPLICANT_AP,
[MRP_EVENT_R_LV] = MRP_APPLICANT_VP,
[MRP_EVENT_R_LA] = MRP_APPLICANT_VP,
[MRP_EVENT_REDECLARE] = MRP_APPLICANT_VP,
[MRP_EVENT_PERIODIC] = MRP_APPLICANT_AP,
},
};
static const u8
mrp_tx_action_table[MRP_APPLICANT_MAX + 1] = {
[MRP_APPLICANT_VO] = MRP_TX_ACTION_S_IN_OPTIONAL,
[MRP_APPLICANT_VP] = MRP_TX_ACTION_S_JOIN_IN,
[MRP_APPLICANT_VN] = MRP_TX_ACTION_S_NEW,
[MRP_APPLICANT_AN] = MRP_TX_ACTION_S_NEW,
[MRP_APPLICANT_AA] = MRP_TX_ACTION_S_JOIN_IN,
[MRP_APPLICANT_QA] = MRP_TX_ACTION_S_JOIN_IN_OPTIONAL,
[MRP_APPLICANT_LA] = MRP_TX_ACTION_S_LV,
[MRP_APPLICANT_AO] = MRP_TX_ACTION_S_IN_OPTIONAL,
[MRP_APPLICANT_QO] = MRP_TX_ACTION_S_IN_OPTIONAL,
[MRP_APPLICANT_AP] = MRP_TX_ACTION_S_JOIN_IN,
[MRP_APPLICANT_QP] = MRP_TX_ACTION_S_IN_OPTIONAL,
};
static void mrp_attrvalue_inc(void *value, u8 len)
{
u8 *v = (u8 *)value;
/* Add 1 to the last byte. If it becomes zero,
* go to the previous byte and repeat.
*/
while (len > 0 && !++v[--len])
;
}
static int mrp_attr_cmp(const struct mrp_attr *attr,
const void *value, u8 len, u8 type)
{
if (attr->type != type)
return attr->type - type;
if (attr->len != len)
return attr->len - len;
return memcmp(attr->value, value, len);
}
static struct mrp_attr *mrp_attr_lookup(const struct mrp_applicant *app,
const void *value, u8 len, u8 type)
{
struct rb_node *parent = app->mad.rb_node;
struct mrp_attr *attr;
int d;
while (parent) {
attr = rb_entry(parent, struct mrp_attr, node);
d = mrp_attr_cmp(attr, value, len, type);
if (d > 0)
parent = parent->rb_left;
else if (d < 0)
parent = parent->rb_right;
else
return attr;
}
return NULL;
}
static struct mrp_attr *mrp_attr_create(struct mrp_applicant *app,
const void *value, u8 len, u8 type)
{
struct rb_node *parent = NULL, **p = &app->mad.rb_node;
struct mrp_attr *attr;
int d;
while (*p) {
parent = *p;
attr = rb_entry(parent, struct mrp_attr, node);
d = mrp_attr_cmp(attr, value, len, type);
if (d > 0)
p = &parent->rb_left;
else if (d < 0)
p = &parent->rb_right;
else {
/* The attribute already exists; re-use it. */
return attr;
}
}
attr = kmalloc(sizeof(*attr) + len, GFP_ATOMIC);
if (!attr)
return attr;
attr->state = MRP_APPLICANT_VO;
attr->type = type;
attr->len = len;
memcpy(attr->value, value, len);
rb_link_node(&attr->node, parent, p);
rb_insert_color(&attr->node, &app->mad);
return attr;
}
static void mrp_attr_destroy(struct mrp_applicant *app, struct mrp_attr *attr)
{
rb_erase(&attr->node, &app->mad);
kfree(attr);
}
static int mrp_pdu_init(struct mrp_applicant *app)
{
struct sk_buff *skb;
struct mrp_pdu_hdr *ph;
skb = alloc_skb(app->dev->mtu + LL_RESERVED_SPACE(app->dev),
GFP_ATOMIC);
if (!skb)
return -ENOMEM;
skb->dev = app->dev;
skb->protocol = app->app->pkttype.type;
skb_reserve(skb, LL_RESERVED_SPACE(app->dev));
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
ph = __skb_put(skb, sizeof(*ph));
ph->version = app->app->version;
app->pdu = skb;
return 0;
}
static int mrp_pdu_append_end_mark(struct mrp_applicant *app)
{
__be16 *endmark;
if (skb_tailroom(app->pdu) < sizeof(*endmark))
return -1;
endmark = __skb_put(app->pdu, sizeof(*endmark));
put_unaligned(MRP_END_MARK, endmark);
return 0;
}
static void mrp_pdu_queue(struct mrp_applicant *app)
{
if (!app->pdu)
return;
if (mrp_cb(app->pdu)->mh)
mrp_pdu_append_end_mark(app);
mrp_pdu_append_end_mark(app);
dev_hard_header(app->pdu, app->dev, ntohs(app->app->pkttype.type),
app->app->group_address, app->dev->dev_addr,
app->pdu->len);
skb_queue_tail(&app->queue, app->pdu);
app->pdu = NULL;
}
static void mrp_queue_xmit(struct mrp_applicant *app)
{
struct sk_buff *skb;
while ((skb = skb_dequeue(&app->queue)))
dev_queue_xmit(skb);
}
static int mrp_pdu_append_msg_hdr(struct mrp_applicant *app,
u8 attrtype, u8 attrlen)
{
struct mrp_msg_hdr *mh;
if (mrp_cb(app->pdu)->mh) {
if (mrp_pdu_append_end_mark(app) < 0)
return -1;
mrp_cb(app->pdu)->mh = NULL;
mrp_cb(app->pdu)->vah = NULL;
}
if (skb_tailroom(app->pdu) < sizeof(*mh))
return -1;
mh = __skb_put(app->pdu, sizeof(*mh));
mh->attrtype = attrtype;
mh->attrlen = attrlen;
mrp_cb(app->pdu)->mh = mh;
return 0;
}
static int mrp_pdu_append_vecattr_hdr(struct mrp_applicant *app,
const void *firstattrvalue, u8 attrlen)
{
struct mrp_vecattr_hdr *vah;
if (skb_tailroom(app->pdu) < sizeof(*vah) + attrlen)
return -1;
vah = __skb_put(app->pdu, sizeof(*vah) + attrlen);
put_unaligned(0, &vah->lenflags);
memcpy(vah->firstattrvalue, firstattrvalue, attrlen);
mrp_cb(app->pdu)->vah = vah;
memcpy(mrp_cb(app->pdu)->attrvalue, firstattrvalue, attrlen);
return 0;
}
static int mrp_pdu_append_vecattr_event(struct mrp_applicant *app,
const struct mrp_attr *attr,
enum mrp_vecattr_event vaevent)
{
u16 len, pos;
u8 *vaevents;
int err;
again:
if (!app->pdu) {
err = mrp_pdu_init(app);
if (err < 0)
return err;
}
/* If there is no Message header in the PDU, or the Message header is
* for a different attribute type, add an EndMark (if necessary) and a
* new Message header to the PDU.
*/
if (!mrp_cb(app->pdu)->mh ||
mrp_cb(app->pdu)->mh->attrtype != attr->type ||
mrp_cb(app->pdu)->mh->attrlen != attr->len) {
if (mrp_pdu_append_msg_hdr(app, attr->type, attr->len) < 0)
goto queue;
}
/* If there is no VectorAttribute header for this Message in the PDU,
* or this attribute's value does not sequentially follow the previous
* attribute's value, add a new VectorAttribute header to the PDU.
*/
if (!mrp_cb(app->pdu)->vah ||
memcmp(mrp_cb(app->pdu)->attrvalue, attr->value, attr->len)) {
if (mrp_pdu_append_vecattr_hdr(app, attr->value, attr->len) < 0)
goto queue;
}
len = be16_to_cpu(get_unaligned(&mrp_cb(app->pdu)->vah->lenflags));
pos = len % 3;
/* Events are packed into Vectors in the PDU, three to a byte. Add a
* byte to the end of the Vector if necessary.
*/
if (!pos) {
if (skb_tailroom(app->pdu) < sizeof(u8))
goto queue;
vaevents = __skb_put(app->pdu, sizeof(u8));
} else {
vaevents = (u8 *)(skb_tail_pointer(app->pdu) - sizeof(u8));
}
switch (pos) {
case 0:
*vaevents = vaevent * (__MRP_VECATTR_EVENT_MAX *
__MRP_VECATTR_EVENT_MAX);
break;
case 1:
*vaevents += vaevent * __MRP_VECATTR_EVENT_MAX;
break;
case 2:
*vaevents += vaevent;
break;
default:
WARN_ON(1);
}
/* Increment the length of the VectorAttribute in the PDU, as well as
* the value of the next attribute that would continue its Vector.
*/
put_unaligned(cpu_to_be16(++len), &mrp_cb(app->pdu)->vah->lenflags);
mrp_attrvalue_inc(mrp_cb(app->pdu)->attrvalue, attr->len);
return 0;
queue:
mrp_pdu_queue(app);
goto again;
}
static void mrp_attr_event(struct mrp_applicant *app,
struct mrp_attr *attr, enum mrp_event event)
{
enum mrp_applicant_state state;
state = mrp_applicant_state_table[attr->state][event];
if (state == MRP_APPLICANT_INVALID) {
WARN_ON(1);
return;
}
if (event == MRP_EVENT_TX) {
/* When appending the attribute fails, don't update its state
* in order to retry at the next TX event.
*/
switch (mrp_tx_action_table[attr->state]) {
case MRP_TX_ACTION_NONE:
case MRP_TX_ACTION_S_JOIN_IN_OPTIONAL:
case MRP_TX_ACTION_S_IN_OPTIONAL:
break;
case MRP_TX_ACTION_S_NEW:
if (mrp_pdu_append_vecattr_event(
app, attr, MRP_VECATTR_EVENT_NEW) < 0)
return;
break;
case MRP_TX_ACTION_S_JOIN_IN:
if (mrp_pdu_append_vecattr_event(
app, attr, MRP_VECATTR_EVENT_JOIN_IN) < 0)
return;
break;
case MRP_TX_ACTION_S_LV:
if (mrp_pdu_append_vecattr_event(
app, attr, MRP_VECATTR_EVENT_LV) < 0)
return;
/* As a pure applicant, sending a leave message
* implies that the attribute was unregistered and
* can be destroyed.
*/
mrp_attr_destroy(app, attr);
return;
default:
WARN_ON(1);
}
}
attr->state = state;
}
int mrp_request_join(const struct net_device *dev,
const struct mrp_application *appl,
const void *value, u8 len, u8 type)
{
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
struct mrp_applicant *app = rtnl_dereference(
port->applicants[appl->type]);
struct mrp_attr *attr;
if (sizeof(struct mrp_skb_cb) + len >
FIELD_SIZEOF(struct sk_buff, cb))
return -ENOMEM;
spin_lock_bh(&app->lock);
attr = mrp_attr_create(app, value, len, type);
if (!attr) {
spin_unlock_bh(&app->lock);
return -ENOMEM;
}
mrp_attr_event(app, attr, MRP_EVENT_JOIN);
spin_unlock_bh(&app->lock);
return 0;
}
EXPORT_SYMBOL_GPL(mrp_request_join);
void mrp_request_leave(const struct net_device *dev,
const struct mrp_application *appl,
const void *value, u8 len, u8 type)
{
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
struct mrp_applicant *app = rtnl_dereference(
port->applicants[appl->type]);
struct mrp_attr *attr;
if (sizeof(struct mrp_skb_cb) + len >
FIELD_SIZEOF(struct sk_buff, cb))
return;
spin_lock_bh(&app->lock);
attr = mrp_attr_lookup(app, value, len, type);
if (!attr) {
spin_unlock_bh(&app->lock);
return;
}
mrp_attr_event(app, attr, MRP_EVENT_LV);
spin_unlock_bh(&app->lock);
}
EXPORT_SYMBOL_GPL(mrp_request_leave);
static void mrp_mad_event(struct mrp_applicant *app, enum mrp_event event)
{
struct rb_node *node, *next;
struct mrp_attr *attr;
for (node = rb_first(&app->mad);
next = node ? rb_next(node) : NULL, node != NULL;
node = next) {
attr = rb_entry(node, struct mrp_attr, node);
mrp_attr_event(app, attr, event);
}
}
static void mrp_join_timer_arm(struct mrp_applicant *app)
{
unsigned long delay;
delay = (u64)msecs_to_jiffies(mrp_join_time) * prandom_u32() >> 32;
mod_timer(&app->join_timer, jiffies + delay);
}
static void mrp_join_timer(struct timer_list *t)
{
struct mrp_applicant *app = from_timer(app, t, join_timer);
spin_lock(&app->lock);
mrp_mad_event(app, MRP_EVENT_TX);
mrp_pdu_queue(app);
spin_unlock(&app->lock);
mrp_queue_xmit(app);
mrp_join_timer_arm(app);
}
static void mrp_periodic_timer_arm(struct mrp_applicant *app)
{
mod_timer(&app->periodic_timer,
jiffies + msecs_to_jiffies(mrp_periodic_time));
}
static void mrp_periodic_timer(struct timer_list *t)
{
struct mrp_applicant *app = from_timer(app, t, periodic_timer);
spin_lock(&app->lock);
mrp_mad_event(app, MRP_EVENT_PERIODIC);
mrp_pdu_queue(app);
spin_unlock(&app->lock);
mrp_periodic_timer_arm(app);
}
static int mrp_pdu_parse_end_mark(struct sk_buff *skb, int *offset)
{
__be16 endmark;
if (skb_copy_bits(skb, *offset, &endmark, sizeof(endmark)) < 0)
return -1;
if (endmark == MRP_END_MARK) {
*offset += sizeof(endmark);
return -1;
}
return 0;
}
static void mrp_pdu_parse_vecattr_event(struct mrp_applicant *app,
struct sk_buff *skb,
enum mrp_vecattr_event vaevent)
{
struct mrp_attr *attr;
enum mrp_event event;
attr = mrp_attr_lookup(app, mrp_cb(skb)->attrvalue,
mrp_cb(skb)->mh->attrlen,
mrp_cb(skb)->mh->attrtype);
if (attr == NULL)
return;
switch (vaevent) {
case MRP_VECATTR_EVENT_NEW:
event = MRP_EVENT_R_NEW;
break;
case MRP_VECATTR_EVENT_JOIN_IN:
event = MRP_EVENT_R_JOIN_IN;
break;
case MRP_VECATTR_EVENT_IN:
event = MRP_EVENT_R_IN;
break;
case MRP_VECATTR_EVENT_JOIN_MT:
event = MRP_EVENT_R_JOIN_MT;
break;
case MRP_VECATTR_EVENT_MT:
event = MRP_EVENT_R_MT;
break;
case MRP_VECATTR_EVENT_LV:
event = MRP_EVENT_R_LV;
break;
default:
return;
}
mrp_attr_event(app, attr, event);
}
static int mrp_pdu_parse_vecattr(struct mrp_applicant *app,
struct sk_buff *skb, int *offset)
{
struct mrp_vecattr_hdr _vah;
u16 valen;
u8 vaevents, vaevent;
mrp_cb(skb)->vah = skb_header_pointer(skb, *offset, sizeof(_vah),
&_vah);
if (!mrp_cb(skb)->vah)
return -1;
*offset += sizeof(_vah);
if (get_unaligned(&mrp_cb(skb)->vah->lenflags) &
MRP_VECATTR_HDR_FLAG_LA)
mrp_mad_event(app, MRP_EVENT_R_LA);
valen = be16_to_cpu(get_unaligned(&mrp_cb(skb)->vah->lenflags) &
MRP_VECATTR_HDR_LEN_MASK);
/* The VectorAttribute structure in a PDU carries event information
* about one or more attributes having consecutive values. Only the
* value for the first attribute is contained in the structure. So
* we make a copy of that value, and then increment it each time we
* advance to the next event in its Vector.
*/
if (sizeof(struct mrp_skb_cb) + mrp_cb(skb)->mh->attrlen >
FIELD_SIZEOF(struct sk_buff, cb))
return -1;
if (skb_copy_bits(skb, *offset, mrp_cb(skb)->attrvalue,
mrp_cb(skb)->mh->attrlen) < 0)
return -1;
*offset += mrp_cb(skb)->mh->attrlen;
/* In a VectorAttribute, the Vector contains events which are packed
* three to a byte. We process one byte of the Vector at a time.
*/
while (valen > 0) {
if (skb_copy_bits(skb, *offset, &vaevents,
sizeof(vaevents)) < 0)
return -1;
*offset += sizeof(vaevents);
/* Extract and process the first event. */
vaevent = vaevents / (__MRP_VECATTR_EVENT_MAX *
__MRP_VECATTR_EVENT_MAX);
if (vaevent >= __MRP_VECATTR_EVENT_MAX) {
/* The byte is malformed; stop processing. */
return -1;
}
mrp_pdu_parse_vecattr_event(app, skb, vaevent);
/* If present, extract and process the second event. */
if (!--valen)
break;
mrp_attrvalue_inc(mrp_cb(skb)->attrvalue,
mrp_cb(skb)->mh->attrlen);
vaevents %= (__MRP_VECATTR_EVENT_MAX *
__MRP_VECATTR_EVENT_MAX);
vaevent = vaevents / __MRP_VECATTR_EVENT_MAX;
mrp_pdu_parse_vecattr_event(app, skb, vaevent);
/* If present, extract and process the third event. */
if (!--valen)
break;
mrp_attrvalue_inc(mrp_cb(skb)->attrvalue,
mrp_cb(skb)->mh->attrlen);
vaevents %= __MRP_VECATTR_EVENT_MAX;
vaevent = vaevents;
mrp_pdu_parse_vecattr_event(app, skb, vaevent);
}
return 0;
}
static int mrp_pdu_parse_msg(struct mrp_applicant *app, struct sk_buff *skb,
int *offset)
{
struct mrp_msg_hdr _mh;
mrp_cb(skb)->mh = skb_header_pointer(skb, *offset, sizeof(_mh), &_mh);
if (!mrp_cb(skb)->mh)
return -1;
*offset += sizeof(_mh);
if (mrp_cb(skb)->mh->attrtype == 0 ||
mrp_cb(skb)->mh->attrtype > app->app->maxattr ||
mrp_cb(skb)->mh->attrlen == 0)
return -1;
while (skb->len > *offset) {
if (mrp_pdu_parse_end_mark(skb, offset) < 0)
break;
if (mrp_pdu_parse_vecattr(app, skb, offset) < 0)
return -1;
}
return 0;
}
static int mrp_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct mrp_application *appl = container_of(pt, struct mrp_application,
pkttype);
struct mrp_port *port;
struct mrp_applicant *app;
struct mrp_pdu_hdr _ph;
const struct mrp_pdu_hdr *ph;
int offset = skb_network_offset(skb);
/* If the interface is in promiscuous mode, drop the packet if
* it was unicast to another host.
*/
if (unlikely(skb->pkt_type == PACKET_OTHERHOST))
goto out;
skb = skb_share_check(skb, GFP_ATOMIC);
if (unlikely(!skb))
goto out;
port = rcu_dereference(dev->mrp_port);
if (unlikely(!port))
goto out;
app = rcu_dereference(port->applicants[appl->type]);
if (unlikely(!app))
goto out;
ph = skb_header_pointer(skb, offset, sizeof(_ph), &_ph);
if (!ph)
goto out;
offset += sizeof(_ph);
if (ph->version != app->app->version)
goto out;
spin_lock(&app->lock);
while (skb->len > offset) {
if (mrp_pdu_parse_end_mark(skb, &offset) < 0)
break;
if (mrp_pdu_parse_msg(app, skb, &offset) < 0)
break;
}
spin_unlock(&app->lock);
out:
kfree_skb(skb);
return 0;
}
static int mrp_init_port(struct net_device *dev)
{
struct mrp_port *port;
port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
rcu_assign_pointer(dev->mrp_port, port);
return 0;
}
static void mrp_release_port(struct net_device *dev)
{
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
unsigned int i;
for (i = 0; i <= MRP_APPLICATION_MAX; i++) {
if (rtnl_dereference(port->applicants[i]))
return;
}
RCU_INIT_POINTER(dev->mrp_port, NULL);
kfree_rcu(port, rcu);
}
int mrp_init_applicant(struct net_device *dev, struct mrp_application *appl)
{
struct mrp_applicant *app;
int err;
ASSERT_RTNL();
if (!rtnl_dereference(dev->mrp_port)) {
err = mrp_init_port(dev);
if (err < 0)
goto err1;
}
err = -ENOMEM;
app = kzalloc(sizeof(*app), GFP_KERNEL);
if (!app)
goto err2;
err = dev_mc_add(dev, appl->group_address);
if (err < 0)
goto err3;
app->dev = dev;
app->app = appl;
app->mad = RB_ROOT;
spin_lock_init(&app->lock);
skb_queue_head_init(&app->queue);
rcu_assign_pointer(dev->mrp_port->applicants[appl->type], app);
timer_setup(&app->join_timer, mrp_join_timer, 0);
mrp_join_timer_arm(app);
timer_setup(&app->periodic_timer, mrp_periodic_timer, 0);
mrp_periodic_timer_arm(app);
return 0;
err3:
kfree(app);
err2:
mrp_release_port(dev);
err1:
return err;
}
EXPORT_SYMBOL_GPL(mrp_init_applicant);
void mrp_uninit_applicant(struct net_device *dev, struct mrp_application *appl)
{
struct mrp_port *port = rtnl_dereference(dev->mrp_port);
struct mrp_applicant *app = rtnl_dereference(
port->applicants[appl->type]);
ASSERT_RTNL();
RCU_INIT_POINTER(port->applicants[appl->type], NULL);
/* Delete timer and generate a final TX event to flush out
* all pending messages before the applicant is gone.
*/
del_timer_sync(&app->join_timer);
del_timer_sync(&app->periodic_timer);
spin_lock_bh(&app->lock);
mrp_mad_event(app, MRP_EVENT_TX);
mrp_pdu_queue(app);
spin_unlock_bh(&app->lock);
mrp_queue_xmit(app);
dev_mc_del(dev, appl->group_address);
kfree_rcu(app, rcu);
mrp_release_port(dev);
}
EXPORT_SYMBOL_GPL(mrp_uninit_applicant);
int mrp_register_application(struct mrp_application *appl)
{
appl->pkttype.func = mrp_rcv;
dev_add_pack(&appl->pkttype);
return 0;
}
EXPORT_SYMBOL_GPL(mrp_register_application);
void mrp_unregister_application(struct mrp_application *appl)
{
dev_remove_pack(&appl->pkttype);
}
EXPORT_SYMBOL_GPL(mrp_unregister_application);
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