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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/net/switchdev/switchdev.c

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25 KiB
C
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/*
* net/switchdev/switchdev.c - Switch device API
* Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
* Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <net/ip_fib.h>
#include <net/switchdev.h>
/**
* switchdev_port_attr_get - Get port attribute
*
* @dev: port device
* @attr: attribute to get
*/
int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
struct switchdev_attr first = {
.id = SWITCHDEV_ATTR_UNDEFINED
};
int err = -EOPNOTSUPP;
if (ops && ops->switchdev_port_attr_get)
return ops->switchdev_port_attr_get(dev, attr);
if (attr->flags & SWITCHDEV_F_NO_RECURSE)
return err;
/* Switch device port(s) may be stacked under
* bond/team/vlan dev, so recurse down to get attr on
* each port. Return -ENODATA if attr values don't
* compare across ports.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = switchdev_port_attr_get(lower_dev, attr);
if (err)
break;
if (first.id == SWITCHDEV_ATTR_UNDEFINED)
first = *attr;
else if (memcmp(&first, attr, sizeof(*attr)))
return -ENODATA;
}
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
static int __switchdev_port_attr_set(struct net_device *dev,
struct switchdev_attr *attr)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (ops && ops->switchdev_port_attr_set)
return ops->switchdev_port_attr_set(dev, attr);
if (attr->flags & SWITCHDEV_F_NO_RECURSE)
return err;
/* Switch device port(s) may be stacked under
* bond/team/vlan dev, so recurse down to set attr on
* each port.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = __switchdev_port_attr_set(lower_dev, attr);
if (err)
break;
}
return err;
}
struct switchdev_attr_set_work {
struct work_struct work;
struct net_device *dev;
struct switchdev_attr attr;
};
static void switchdev_port_attr_set_work(struct work_struct *work)
{
struct switchdev_attr_set_work *asw =
container_of(work, struct switchdev_attr_set_work, work);
int err;
rtnl_lock();
err = switchdev_port_attr_set(asw->dev, &asw->attr);
if (err && err != -EOPNOTSUPP)
netdev_err(asw->dev, "failed (err=%d) to set attribute (id=%d)\n",
err, asw->attr.id);
rtnl_unlock();
dev_put(asw->dev);
kfree(work);
}
static int switchdev_port_attr_set_defer(struct net_device *dev,
struct switchdev_attr *attr)
{
struct switchdev_attr_set_work *asw;
asw = kmalloc(sizeof(*asw), GFP_ATOMIC);
if (!asw)
return -ENOMEM;
INIT_WORK(&asw->work, switchdev_port_attr_set_work);
dev_hold(dev);
asw->dev = dev;
memcpy(&asw->attr, attr, sizeof(asw->attr));
schedule_work(&asw->work);
return 0;
}
/**
* switchdev_port_attr_set - Set port attribute
*
* @dev: port device
* @attr: attribute to set
*
* Use a 2-phase prepare-commit transaction model to ensure
* system is not left in a partially updated state due to
* failure from driver/device.
*/
int switchdev_port_attr_set(struct net_device *dev, struct switchdev_attr *attr)
{
int err;
if (!rtnl_is_locked()) {
/* Running prepare-commit transaction across stacked
* devices requires nothing moves, so if rtnl_lock is
* not held, schedule a worker thread to hold rtnl_lock
* while setting attr.
*/
return switchdev_port_attr_set_defer(dev, attr);
}
/* Phase I: prepare for attr set. Driver/device should fail
* here if there are going to be issues in the commit phase,
* such as lack of resources or support. The driver/device
* should reserve resources needed for the commit phase here,
* but should not commit the attr.
*/
attr->trans = SWITCHDEV_TRANS_PREPARE;
err = __switchdev_port_attr_set(dev, attr);
if (err) {
/* Prepare phase failed: abort the transaction. Any
* resources reserved in the prepare phase are
* released.
*/
attr->trans = SWITCHDEV_TRANS_ABORT;
__switchdev_port_attr_set(dev, attr);
return err;
}
/* Phase II: commit attr set. This cannot fail as a fault
* of driver/device. If it does, it's a bug in the driver/device
* because the driver said everythings was OK in phase I.
*/
attr->trans = SWITCHDEV_TRANS_COMMIT;
err = __switchdev_port_attr_set(dev, attr);
WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
dev->name, attr->id);
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
static int __switchdev_port_obj_add(struct net_device *dev,
struct switchdev_obj *obj)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (ops && ops->switchdev_port_obj_add)
return ops->switchdev_port_obj_add(dev, obj);
/* Switch device port(s) may be stacked under
* bond/team/vlan dev, so recurse down to add object on
* each port.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = __switchdev_port_obj_add(lower_dev, obj);
if (err)
break;
}
return err;
}
/**
* switchdev_port_obj_add - Add port object
*
* @dev: port device
* @obj: object to add
*
* Use a 2-phase prepare-commit transaction model to ensure
* system is not left in a partially updated state due to
* failure from driver/device.
*
* rtnl_lock must be held.
*/
int switchdev_port_obj_add(struct net_device *dev, struct switchdev_obj *obj)
{
int err;
ASSERT_RTNL();
/* Phase I: prepare for obj add. Driver/device should fail
* here if there are going to be issues in the commit phase,
* such as lack of resources or support. The driver/device
* should reserve resources needed for the commit phase here,
* but should not commit the obj.
*/
obj->trans = SWITCHDEV_TRANS_PREPARE;
err = __switchdev_port_obj_add(dev, obj);
if (err) {
/* Prepare phase failed: abort the transaction. Any
* resources reserved in the prepare phase are
* released.
*/
obj->trans = SWITCHDEV_TRANS_ABORT;
__switchdev_port_obj_add(dev, obj);
return err;
}
/* Phase II: commit obj add. This cannot fail as a fault
* of driver/device. If it does, it's a bug in the driver/device
* because the driver said everythings was OK in phase I.
*/
obj->trans = SWITCHDEV_TRANS_COMMIT;
err = __switchdev_port_obj_add(dev, obj);
WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
/**
* switchdev_port_obj_del - Delete port object
*
* @dev: port device
* @obj: object to delete
*/
int switchdev_port_obj_del(struct net_device *dev, struct switchdev_obj *obj)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (ops && ops->switchdev_port_obj_del)
return ops->switchdev_port_obj_del(dev, obj);
/* Switch device port(s) may be stacked under
* bond/team/vlan dev, so recurse down to delete object on
* each port.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = switchdev_port_obj_del(lower_dev, obj);
if (err)
break;
}
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
/**
* switchdev_port_obj_dump - Dump port objects
*
* @dev: port device
* @obj: object to dump
*/
int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct list_head *iter;
int err = -EOPNOTSUPP;
if (ops && ops->switchdev_port_obj_dump)
return ops->switchdev_port_obj_dump(dev, obj);
/* Switch device port(s) may be stacked under
* bond/team/vlan dev, so recurse down to dump objects on
* first port at bottom of stack.
*/
netdev_for_each_lower_dev(dev, lower_dev, iter) {
err = switchdev_port_obj_dump(lower_dev, obj);
break;
}
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_obj_dump);
static DEFINE_MUTEX(switchdev_mutex);
static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
/**
* register_switchdev_notifier - Register notifier
* @nb: notifier_block
*
* Register switch device notifier. This should be used by code
* which needs to monitor events happening in particular device.
* Return values are same as for atomic_notifier_chain_register().
*/
int register_switchdev_notifier(struct notifier_block *nb)
{
int err;
mutex_lock(&switchdev_mutex);
err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
mutex_unlock(&switchdev_mutex);
return err;
}
EXPORT_SYMBOL_GPL(register_switchdev_notifier);
/**
* unregister_switchdev_notifier - Unregister notifier
* @nb: notifier_block
*
* Unregister switch device notifier.
* Return values are same as for atomic_notifier_chain_unregister().
*/
int unregister_switchdev_notifier(struct notifier_block *nb)
{
int err;
mutex_lock(&switchdev_mutex);
err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
mutex_unlock(&switchdev_mutex);
return err;
}
EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
/**
* call_switchdev_notifiers - Call notifiers
* @val: value passed unmodified to notifier function
* @dev: port device
* @info: notifier information data
*
* Call all network notifier blocks. This should be called by driver
* when it needs to propagate hardware event.
* Return values are same as for atomic_notifier_call_chain().
*/
int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
struct switchdev_notifier_info *info)
{
int err;
info->dev = dev;
mutex_lock(&switchdev_mutex);
err = raw_notifier_call_chain(&switchdev_notif_chain, val, info);
mutex_unlock(&switchdev_mutex);
return err;
}
EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
struct switchdev_vlan_dump {
struct switchdev_obj obj;
struct sk_buff *skb;
u32 filter_mask;
u16 flags;
u16 begin;
u16 end;
};
static int switchdev_port_vlan_dump_put(struct net_device *dev,
struct switchdev_vlan_dump *dump)
{
struct bridge_vlan_info vinfo;
vinfo.flags = dump->flags;
if (dump->begin == 0 && dump->end == 0) {
return 0;
} else if (dump->begin == dump->end) {
vinfo.vid = dump->begin;
if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
sizeof(vinfo), &vinfo))
return -EMSGSIZE;
} else {
vinfo.vid = dump->begin;
vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
sizeof(vinfo), &vinfo))
return -EMSGSIZE;
vinfo.vid = dump->end;
vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_END;
if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
sizeof(vinfo), &vinfo))
return -EMSGSIZE;
}
return 0;
}
static int switchdev_port_vlan_dump_cb(struct net_device *dev,
struct switchdev_obj *obj)
{
struct switchdev_vlan_dump *dump =
container_of(obj, struct switchdev_vlan_dump, obj);
struct switchdev_obj_vlan *vlan = &dump->obj.u.vlan;
int err = 0;
if (vlan->vid_begin > vlan->vid_end)
return -EINVAL;
if (dump->filter_mask & RTEXT_FILTER_BRVLAN) {
dump->flags = vlan->flags;
for (dump->begin = dump->end = vlan->vid_begin;
dump->begin <= vlan->vid_end;
dump->begin++, dump->end++) {
err = switchdev_port_vlan_dump_put(dev, dump);
if (err)
return err;
}
} else if (dump->filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) {
if (dump->begin > vlan->vid_begin &&
dump->begin >= vlan->vid_end) {
if ((dump->begin - 1) == vlan->vid_end &&
dump->flags == vlan->flags) {
/* prepend */
dump->begin = vlan->vid_begin;
} else {
err = switchdev_port_vlan_dump_put(dev, dump);
dump->flags = vlan->flags;
dump->begin = vlan->vid_begin;
dump->end = vlan->vid_end;
}
} else if (dump->end <= vlan->vid_begin &&
dump->end < vlan->vid_end) {
if ((dump->end + 1) == vlan->vid_begin &&
dump->flags == vlan->flags) {
/* append */
dump->end = vlan->vid_end;
} else {
err = switchdev_port_vlan_dump_put(dev, dump);
dump->flags = vlan->flags;
dump->begin = vlan->vid_begin;
dump->end = vlan->vid_end;
}
} else {
err = -EINVAL;
}
}
return err;
}
static int switchdev_port_vlan_fill(struct sk_buff *skb, struct net_device *dev,
u32 filter_mask)
{
struct switchdev_vlan_dump dump = {
.obj = {
.id = SWITCHDEV_OBJ_PORT_VLAN,
.cb = switchdev_port_vlan_dump_cb,
},
.skb = skb,
.filter_mask = filter_mask,
};
int err = 0;
if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
err = switchdev_port_obj_dump(dev, &dump.obj);
if (err)
goto err_out;
if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
/* last one */
err = switchdev_port_vlan_dump_put(dev, &dump);
}
err_out:
return err == -EOPNOTSUPP ? 0 : err;
}
/**
* switchdev_port_bridge_getlink - Get bridge port attributes
*
* @dev: port device
*
* Called for SELF on rtnl_bridge_getlink to get bridge port
* attributes.
*/
int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
struct net_device *dev, u32 filter_mask,
int nlflags)
{
struct switchdev_attr attr = {
.id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
};
u16 mode = BRIDGE_MODE_UNDEF;
u32 mask = BR_LEARNING | BR_LEARNING_SYNC;
int err;
err = switchdev_port_attr_get(dev, &attr);
if (err && err != -EOPNOTSUPP)
return err;
return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
attr.u.brport_flags, mask, nlflags,
filter_mask, switchdev_port_vlan_fill);
}
EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
static int switchdev_port_br_setflag(struct net_device *dev,
struct nlattr *nlattr,
unsigned long brport_flag)
{
struct switchdev_attr attr = {
.id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
};
u8 flag = nla_get_u8(nlattr);
int err;
err = switchdev_port_attr_get(dev, &attr);
if (err)
return err;
if (flag)
attr.u.brport_flags |= brport_flag;
else
attr.u.brport_flags &= ~brport_flag;
return switchdev_port_attr_set(dev, &attr);
}
static const struct nla_policy
switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
[IFLA_BRPORT_STATE] = { .type = NLA_U8 },
[IFLA_BRPORT_COST] = { .type = NLA_U32 },
[IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
[IFLA_BRPORT_MODE] = { .type = NLA_U8 },
[IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
[IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
[IFLA_BRPORT_FAST_LEAVE] = { .type = NLA_U8 },
[IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
[IFLA_BRPORT_LEARNING_SYNC] = { .type = NLA_U8 },
[IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
};
static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
struct nlattr *protinfo)
{
struct nlattr *attr;
int rem;
int err;
err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
switchdev_port_bridge_policy);
if (err)
return err;
nla_for_each_nested(attr, protinfo, rem) {
switch (nla_type(attr)) {
case IFLA_BRPORT_LEARNING:
err = switchdev_port_br_setflag(dev, attr,
BR_LEARNING);
break;
case IFLA_BRPORT_LEARNING_SYNC:
err = switchdev_port_br_setflag(dev, attr,
BR_LEARNING_SYNC);
break;
default:
err = -EOPNOTSUPP;
break;
}
if (err)
return err;
}
return 0;
}
static int switchdev_port_br_afspec(struct net_device *dev,
struct nlattr *afspec,
int (*f)(struct net_device *dev,
struct switchdev_obj *obj))
{
struct nlattr *attr;
struct bridge_vlan_info *vinfo;
struct switchdev_obj obj = {
.id = SWITCHDEV_OBJ_PORT_VLAN,
};
struct switchdev_obj_vlan *vlan = &obj.u.vlan;
int rem;
int err;
nla_for_each_nested(attr, afspec, rem) {
if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
continue;
if (nla_len(attr) != sizeof(struct bridge_vlan_info))
return -EINVAL;
vinfo = nla_data(attr);
vlan->flags = vinfo->flags;
if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
if (vlan->vid_begin)
return -EINVAL;
vlan->vid_begin = vinfo->vid;
} else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
if (!vlan->vid_begin)
return -EINVAL;
vlan->vid_end = vinfo->vid;
if (vlan->vid_end <= vlan->vid_begin)
return -EINVAL;
err = f(dev, &obj);
if (err)
return err;
memset(vlan, 0, sizeof(*vlan));
} else {
if (vlan->vid_begin)
return -EINVAL;
vlan->vid_begin = vinfo->vid;
vlan->vid_end = vinfo->vid;
err = f(dev, &obj);
if (err)
return err;
memset(vlan, 0, sizeof(*vlan));
}
}
return 0;
}
/**
* switchdev_port_bridge_setlink - Set bridge port attributes
*
* @dev: port device
* @nlh: netlink header
* @flags: netlink flags
*
* Called for SELF on rtnl_bridge_setlink to set bridge port
* attributes.
*/
int switchdev_port_bridge_setlink(struct net_device *dev,
struct nlmsghdr *nlh, u16 flags)
{
struct nlattr *protinfo;
struct nlattr *afspec;
int err = 0;
protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
IFLA_PROTINFO);
if (protinfo) {
err = switchdev_port_br_setlink_protinfo(dev, protinfo);
if (err)
return err;
}
afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
IFLA_AF_SPEC);
if (afspec)
err = switchdev_port_br_afspec(dev, afspec,
switchdev_port_obj_add);
return err;
}
EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);
/**
* switchdev_port_bridge_dellink - Set bridge port attributes
*
* @dev: port device
* @nlh: netlink header
* @flags: netlink flags
*
* Called for SELF on rtnl_bridge_dellink to set bridge port
* attributes.
*/
int switchdev_port_bridge_dellink(struct net_device *dev,
struct nlmsghdr *nlh, u16 flags)
{
struct nlattr *afspec;
afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
IFLA_AF_SPEC);
if (afspec)
return switchdev_port_br_afspec(dev, afspec,
switchdev_port_obj_del);
return 0;
}
EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
/**
* switchdev_port_fdb_add - Add FDB (MAC/VLAN) entry to port
*
* @ndmsg: netlink hdr
* @nlattr: netlink attributes
* @dev: port device
* @addr: MAC address to add
* @vid: VLAN to add
*
* Add FDB entry to switch device.
*/
int switchdev_port_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
struct net_device *dev, const unsigned char *addr,
u16 vid, u16 nlm_flags)
{
struct switchdev_obj obj = {
.id = SWITCHDEV_OBJ_PORT_FDB,
.u.fdb = {
.addr = addr,
.vid = vid,
},
};
return switchdev_port_obj_add(dev, &obj);
}
EXPORT_SYMBOL_GPL(switchdev_port_fdb_add);
/**
* switchdev_port_fdb_del - Delete FDB (MAC/VLAN) entry from port
*
* @ndmsg: netlink hdr
* @nlattr: netlink attributes
* @dev: port device
* @addr: MAC address to delete
* @vid: VLAN to delete
*
* Delete FDB entry from switch device.
*/
int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
struct net_device *dev, const unsigned char *addr,
u16 vid)
{
struct switchdev_obj obj = {
.id = SWITCHDEV_OBJ_PORT_FDB,
.u.fdb = {
.addr = addr,
.vid = vid,
},
};
return switchdev_port_obj_del(dev, &obj);
}
EXPORT_SYMBOL_GPL(switchdev_port_fdb_del);
struct switchdev_fdb_dump {
struct switchdev_obj obj;
struct sk_buff *skb;
struct netlink_callback *cb;
int idx;
};
static int switchdev_port_fdb_dump_cb(struct net_device *dev,
struct switchdev_obj *obj)
{
struct switchdev_fdb_dump *dump =
container_of(obj, struct switchdev_fdb_dump, obj);
u32 portid = NETLINK_CB(dump->cb->skb).portid;
u32 seq = dump->cb->nlh->nlmsg_seq;
struct nlmsghdr *nlh;
struct ndmsg *ndm;
if (dump->idx < dump->cb->args[0])
goto skip;
nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
sizeof(*ndm), NLM_F_MULTI);
if (!nlh)
return -EMSGSIZE;
ndm = nlmsg_data(nlh);
ndm->ndm_family = AF_BRIDGE;
ndm->ndm_pad1 = 0;
ndm->ndm_pad2 = 0;
ndm->ndm_flags = NTF_SELF;
ndm->ndm_type = 0;
ndm->ndm_ifindex = dev->ifindex;
ndm->ndm_state = NUD_REACHABLE;
if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, obj->u.fdb.addr))
goto nla_put_failure;
if (obj->u.fdb.vid && nla_put_u16(dump->skb, NDA_VLAN, obj->u.fdb.vid))
goto nla_put_failure;
nlmsg_end(dump->skb, nlh);
skip:
dump->idx++;
return 0;
nla_put_failure:
nlmsg_cancel(dump->skb, nlh);
return -EMSGSIZE;
}
/**
* switchdev_port_fdb_dump - Dump port FDB (MAC/VLAN) entries
*
* @skb: netlink skb
* @cb: netlink callback
* @dev: port device
* @filter_dev: filter device
* @idx:
*
* Delete FDB entry from switch device.
*/
int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
struct net_device *dev,
struct net_device *filter_dev, int idx)
{
struct switchdev_fdb_dump dump = {
.obj = {
.id = SWITCHDEV_OBJ_PORT_FDB,
.cb = switchdev_port_fdb_dump_cb,
},
.skb = skb,
.cb = cb,
.idx = idx,
};
int err;
err = switchdev_port_obj_dump(dev, &dump.obj);
if (err)
return err;
return dump.idx;
}
EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);
static struct net_device *switchdev_get_lowest_dev(struct net_device *dev)
{
const struct switchdev_ops *ops = dev->switchdev_ops;
struct net_device *lower_dev;
struct net_device *port_dev;
struct list_head *iter;
/* Recusively search down until we find a sw port dev.
* (A sw port dev supports switchdev_port_attr_get).
*/
if (ops && ops->switchdev_port_attr_get)
return dev;
netdev_for_each_lower_dev(dev, lower_dev, iter) {
port_dev = switchdev_get_lowest_dev(lower_dev);
if (port_dev)
return port_dev;
}
return NULL;
}
static struct net_device *switchdev_get_dev_by_nhs(struct fib_info *fi)
{
struct switchdev_attr attr = {
.id = SWITCHDEV_ATTR_PORT_PARENT_ID,
};
struct switchdev_attr prev_attr;
struct net_device *dev = NULL;
int nhsel;
/* For this route, all nexthop devs must be on the same switch. */
for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
const struct fib_nh *nh = &fi->fib_nh[nhsel];
if (!nh->nh_dev)
return NULL;
dev = switchdev_get_lowest_dev(nh->nh_dev);
if (!dev)
return NULL;
if (switchdev_port_attr_get(dev, &attr))
return NULL;
if (nhsel > 0) {
if (prev_attr.u.ppid.id_len != attr.u.ppid.id_len)
return NULL;
if (memcmp(prev_attr.u.ppid.id, attr.u.ppid.id,
attr.u.ppid.id_len))
return NULL;
}
prev_attr = attr;
}
return dev;
}
/**
* switchdev_fib_ipv4_add - Add/modify switch IPv4 route entry
*
* @dst: route's IPv4 destination address
* @dst_len: destination address length (prefix length)
* @fi: route FIB info structure
* @tos: route TOS
* @type: route type
* @nlflags: netlink flags passed in (NLM_F_*)
* @tb_id: route table ID
*
* Add/modify switch IPv4 route entry.
*/
int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
u8 tos, u8 type, u32 nlflags, u32 tb_id)
{
struct switchdev_obj fib_obj = {
.id = SWITCHDEV_OBJ_IPV4_FIB,
.u.ipv4_fib = {
.dst = dst,
.dst_len = dst_len,
.fi = fi,
.tos = tos,
.type = type,
.nlflags = nlflags,
.tb_id = tb_id,
},
};
struct net_device *dev;
int err = 0;
/* Don't offload route if using custom ip rules or if
* IPv4 FIB offloading has been disabled completely.
*/
#ifdef CONFIG_IP_MULTIPLE_TABLES
if (fi->fib_net->ipv4.fib_has_custom_rules)
return 0;
#endif
if (fi->fib_net->ipv4.fib_offload_disabled)
return 0;
dev = switchdev_get_dev_by_nhs(fi);
if (!dev)
return 0;
err = switchdev_port_obj_add(dev, &fib_obj);
if (!err)
fi->fib_flags |= RTNH_F_OFFLOAD;
return err == -EOPNOTSUPP ? 0 : err;
}
EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);
/**
* switchdev_fib_ipv4_del - Delete IPv4 route entry from switch
*
* @dst: route's IPv4 destination address
* @dst_len: destination address length (prefix length)
* @fi: route FIB info structure
* @tos: route TOS
* @type: route type
* @tb_id: route table ID
*
* Delete IPv4 route entry from switch device.
*/
int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
u8 tos, u8 type, u32 tb_id)
{
struct switchdev_obj fib_obj = {
.id = SWITCHDEV_OBJ_IPV4_FIB,
.u.ipv4_fib = {
.dst = dst,
.dst_len = dst_len,
.fi = fi,
.tos = tos,
.type = type,
.nlflags = 0,
.tb_id = tb_id,
},
};
struct net_device *dev;
int err = 0;
if (!(fi->fib_flags & RTNH_F_OFFLOAD))
return 0;
dev = switchdev_get_dev_by_nhs(fi);
if (!dev)
return 0;
err = switchdev_port_obj_del(dev, &fib_obj);
if (!err)
fi->fib_flags &= ~RTNH_F_OFFLOAD;
return err == -EOPNOTSUPP ? 0 : err;
}
EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);
/**
* switchdev_fib_ipv4_abort - Abort an IPv4 FIB operation
*
* @fi: route FIB info structure
*/
void switchdev_fib_ipv4_abort(struct fib_info *fi)
{
/* There was a problem installing this route to the offload
* device. For now, until we come up with more refined
* policy handling, abruptly end IPv4 fib offloading for
* for entire net by flushing offload device(s) of all
* IPv4 routes, and mark IPv4 fib offloading broken from
* this point forward.
*/
fib_flush_external(fi->fib_net);
fi->fib_net->ipv4.fib_offload_disabled = true;
}
EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_abort);
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