summaryrefslogtreecommitdiffstats
path: root/net/bridge
diff options
context:
space:
mode:
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_forward.c5
-rw-r--r--net/bridge/br_input.c60
-rw-r--r--net/bridge/br_netfilter.c1
-rw-r--r--net/bridge/br_netlink.c4
-rw-r--r--net/bridge/br_private.h1
-rw-r--r--net/bridge/br_sysfs_if.c2
-rw-r--r--net/bridge/br_vlan.c4
7 files changed, 74 insertions, 3 deletions
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 44cb786b925a..f96933a823e3 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -184,6 +184,11 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
/* Do not flood unicast traffic to ports that turn it off */
if (unicast && !(p->flags & BR_FLOOD))
continue;
+
+ /* Do not flood to ports that enable proxy ARP */
+ if (p->flags & BR_PROXYARP)
+ continue;
+
prev = maybe_deliver(prev, p, skb, __packet_hook);
if (IS_ERR(prev))
goto out;
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 6fd5522df696..1f1de715197c 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -16,6 +16,8 @@
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/netfilter_bridge.h>
+#include <linux/neighbour.h>
+#include <net/arp.h>
#include <linux/export.h>
#include <linux/rculist.h>
#include "br_private.h"
@@ -57,6 +59,60 @@ static int br_pass_frame_up(struct sk_buff *skb)
netif_receive_skb);
}
+static void br_do_proxy_arp(struct sk_buff *skb, struct net_bridge *br,
+ u16 vid)
+{
+ struct net_device *dev = br->dev;
+ struct neighbour *n;
+ struct arphdr *parp;
+ u8 *arpptr, *sha;
+ __be32 sip, tip;
+
+ if (dev->flags & IFF_NOARP)
+ return;
+
+ if (!pskb_may_pull(skb, arp_hdr_len(dev))) {
+ dev->stats.tx_dropped++;
+ return;
+ }
+ parp = arp_hdr(skb);
+
+ if (parp->ar_pro != htons(ETH_P_IP) ||
+ parp->ar_op != htons(ARPOP_REQUEST) ||
+ parp->ar_hln != dev->addr_len ||
+ parp->ar_pln != 4)
+ return;
+
+ arpptr = (u8 *)parp + sizeof(struct arphdr);
+ sha = arpptr;
+ arpptr += dev->addr_len; /* sha */
+ memcpy(&sip, arpptr, sizeof(sip));
+ arpptr += sizeof(sip);
+ arpptr += dev->addr_len; /* tha */
+ memcpy(&tip, arpptr, sizeof(tip));
+
+ if (ipv4_is_loopback(tip) ||
+ ipv4_is_multicast(tip))
+ return;
+
+ n = neigh_lookup(&arp_tbl, &tip, dev);
+ if (n) {
+ struct net_bridge_fdb_entry *f;
+
+ if (!(n->nud_state & NUD_VALID)) {
+ neigh_release(n);
+ return;
+ }
+
+ f = __br_fdb_get(br, n->ha, vid);
+ if (f)
+ arp_send(ARPOP_REPLY, ETH_P_ARP, sip, skb->dev, tip,
+ sha, n->ha, sha);
+
+ neigh_release(n);
+ }
+}
+
/* note: already called with rcu_read_lock */
int br_handle_frame_finish(struct sk_buff *skb)
{
@@ -98,6 +154,10 @@ int br_handle_frame_finish(struct sk_buff *skb)
dst = NULL;
if (is_broadcast_ether_addr(dest)) {
+ if (p->flags & BR_PROXYARP &&
+ skb->protocol == htons(ETH_P_ARP))
+ br_do_proxy_arp(skb, br, vid);
+
skb2 = skb;
unicast = false;
} else if (is_multicast_ether_addr(dest)) {
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c
index 1a4f32c09ad5..c190d22b6b3d 100644
--- a/net/bridge/br_netfilter.c
+++ b/net/bridge/br_netfilter.c
@@ -35,6 +35,7 @@
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/route.h>
+#include <net/netfilter/br_netfilter.h>
#include <asm/uaccess.h>
#include "br_private.h"
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index e5ec470b851f..9f5eb55a4d3a 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -60,7 +60,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
- nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
+ nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
+ nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)))
return -EMSGSIZE;
return 0;
@@ -333,6 +334,7 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
+ br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
if (tb[IFLA_BRPORT_COST]) {
err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 4d783d071305..8f3f08140258 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -172,6 +172,7 @@ struct net_bridge_port
#define BR_FLOOD 0x00000040
#define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
#define BR_PROMISC 0x00000080
+#define BR_PROXYARP 0x00000100
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
struct bridge_mcast_own_query ip4_own_query;
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index e561cd59b8a6..2de5d91199e8 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -170,6 +170,7 @@ BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
BRPORT_ATTR_FLAG(learning, BR_LEARNING);
BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
+BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
@@ -213,6 +214,7 @@ static const struct brport_attribute *brport_attrs[] = {
&brport_attr_multicast_router,
&brport_attr_multicast_fast_leave,
#endif
+ &brport_attr_proxyarp,
NULL
};
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index 150048fb99b0..97b8ddf57363 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -199,8 +199,8 @@ bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
if (skb->vlan_proto != proto) {
/* Protocol-mismatch, empty out vlan_tci for new tag */
skb_push(skb, ETH_HLEN);
- skb = __vlan_put_tag(skb, skb->vlan_proto,
- vlan_tx_tag_get(skb));
+ skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
+ vlan_tx_tag_get(skb));
if (unlikely(!skb))
return false;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 21:51:40 +0000