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Subject[PATCH RFC tip/core/rcu 04/23] net: Make accesses to ->br_port safe for sparse RCU
Date
The new versions of the rcu_dereference() APIs requires that any pointers
passed to one of these APIs be fully defined. The ->br_port field
in struct net_device points to a struct net_bridge_port, which is an
incomplete type. This commit therefore changes ->br_port to be a void*,
and introduces a br_port() helper function to convert the type to struct
net_bridge_port, and applies this new helper function where required.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: David Miller <davem@davemloft.net>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
---
include/linux/if_bridge.h | 3 +++
net/bridge/br_fdb.c | 2 +-
net/bridge/br_private.h | 8 ++++++++
net/bridge/netfilter/ebt_redirect.c | 2 +-
net/bridge/netfilter/ebt_ulog.c | 4 ++--
net/bridge/netfilter/ebtables.c | 4 ++--
net/netfilter/nfnetlink_log.c | 4 ++--
net/netfilter/nfnetlink_queue.c | 4 ++--
8 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/include/linux/if_bridge.h b/include/linux/if_bridge.h
index 938b7e8..d001d78 100644
--- a/include/linux/if_bridge.h
+++ b/include/linux/if_bridge.h
@@ -101,6 +101,9 @@ struct __fdb_entry {

#include <linux/netdevice.h>

+/* br_handle_frame_hook() needs the following forward declaration. */
+struct net_bridge_port;
+
extern void brioctl_set(int (*ioctl_hook)(struct net *, unsigned int, void __user *));
extern struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
struct sk_buff *skb);
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 9101a4e..3f66cd1 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -246,7 +246,7 @@ int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
return 0;

rcu_read_lock();
- fdb = __br_fdb_get(dev->br_port->br, addr);
+ fdb = __br_fdb_get(br_port(dev)->br, addr);
ret = fdb && fdb->dst->dev != dev &&
fdb->dst->state == BR_STATE_FORWARDING;
rcu_read_unlock();
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 846d7d1..4fedb60 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -229,6 +229,14 @@ static inline int br_is_root_bridge(const struct net_bridge *br)
return !memcmp(&br->bridge_id, &br->designated_root, 8);
}

+static inline struct net_bridge_port *br_port(const struct net_device *dev)
+{
+ if (!dev)
+ return NULL;
+
+ return rcu_dereference(dev->br_port);
+}
+
/* br_device.c */
extern void br_dev_setup(struct net_device *dev);
extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
diff --git a/net/bridge/netfilter/ebt_redirect.c b/net/bridge/netfilter/ebt_redirect.c
index 9be8fbc..4fa8377 100644
--- a/net/bridge/netfilter/ebt_redirect.c
+++ b/net/bridge/netfilter/ebt_redirect.c
@@ -25,7 +25,7 @@ ebt_redirect_tg(struct sk_buff *skb, const struct xt_target_param *par)

if (par->hooknum != NF_BR_BROUTING)
memcpy(eth_hdr(skb)->h_dest,
- par->in->br_port->br->dev->dev_addr, ETH_ALEN);
+ br_port(par->in)->br->dev->dev_addr, ETH_ALEN);
else
memcpy(eth_hdr(skb)->h_dest, par->in->dev_addr, ETH_ALEN);
skb->pkt_type = PACKET_HOST;
diff --git a/net/bridge/netfilter/ebt_ulog.c b/net/bridge/netfilter/ebt_ulog.c
index f9560f3..32ca502 100644
--- a/net/bridge/netfilter/ebt_ulog.c
+++ b/net/bridge/netfilter/ebt_ulog.c
@@ -183,7 +183,7 @@ static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
strcpy(pm->physindev, in->name);
/* If in isn't a bridge, then physindev==indev */
if (in->br_port)
- strcpy(pm->indev, in->br_port->br->dev->name);
+ strcpy(pm->indev, br_port(in)->br->dev->name);
else
strcpy(pm->indev, in->name);
} else
@@ -192,7 +192,7 @@ static void ebt_ulog_packet(unsigned int hooknr, const struct sk_buff *skb,
if (out) {
/* If out exists, then out is a bridge port */
strcpy(pm->physoutdev, out->name);
- strcpy(pm->outdev, out->br_port->br->dev->name);
+ strcpy(pm->outdev, br_port(out)->br->dev->name);
} else
pm->outdev[0] = pm->physoutdev[0] = '\0';

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index f0865fd..ac1361b 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -141,10 +141,10 @@ ebt_basic_match(const struct ebt_entry *e, const struct ethhdr *h,
if (FWINV2(ebt_dev_check(e->out, out), EBT_IOUT))
return 1;
if ((!in || !in->br_port) ? 0 : FWINV2(ebt_dev_check(
- e->logical_in, in->br_port->br->dev), EBT_ILOGICALIN))
+ e->logical_in, br_port(in)->br->dev), EBT_ILOGICALIN))
return 1;
if ((!out || !out->br_port) ? 0 : FWINV2(ebt_dev_check(
- e->logical_out, out->br_port->br->dev), EBT_ILOGICALOUT))
+ e->logical_out, br_port(out)->br->dev), EBT_ILOGICALOUT))
return 1;

if (e->bitmask & EBT_SOURCEMAC) {
diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index 203643f..d89c1be 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -404,7 +404,7 @@ __build_packet_message(struct nfulnl_instance *inst,
htonl(indev->ifindex));
/* this is the bridge group "brX" */
NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV,
- htonl(indev->br_port->br->dev->ifindex));
+ htonl(br_port(indev)->br->dev->ifindex));
} else {
/* Case 2: indev is bridge group, we need to look for
* physical device (when called from ipv4) */
@@ -431,7 +431,7 @@ __build_packet_message(struct nfulnl_instance *inst,
htonl(outdev->ifindex));
/* this is the bridge group "brX" */
NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV,
- htonl(outdev->br_port->br->dev->ifindex));
+ htonl(br_port(outdev)->br->dev->ifindex));
} else {
/* Case 2: indev is a bridge group, we need to look
* for physical device (when called from ipv4) */
diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index e70a6ef..0be9156 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -298,7 +298,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
htonl(indev->ifindex));
/* this is the bridge group "brX" */
NLA_PUT_BE32(skb, NFQA_IFINDEX_INDEV,
- htonl(indev->br_port->br->dev->ifindex));
+ htonl(br_port(indev)->br->dev->ifindex));
} else {
/* Case 2: indev is bridge group, we need to look for
* physical device (when called from ipv4) */
@@ -323,7 +323,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
htonl(outdev->ifindex));
/* this is the bridge group "brX" */
NLA_PUT_BE32(skb, NFQA_IFINDEX_OUTDEV,
- htonl(outdev->br_port->br->dev->ifindex));
+ htonl(br_port(outdev)->br->dev->ifindex));
} else {
/* Case 2: outdev is bridge group, we need to look for
* physical output device (when called from ipv4) */
--
1.7.0.6


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