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Date: Tue, 03 Mar 2015 09:41:47 -0600
From: ebiederm@...ssion.com (Eric W. Biederman)
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, ralf@...ux-mips.org,
linux-hams@...r.kernel.org
Subject: [PATCH net-next] ax25: Stop using magic neighbour cache operations.
Before the ax25 stack calls dev_queue_xmit it always calls
ax25_type_trans which sets skb->protocol to ETH_P_AX25.
Which means that by looking at the protocol type it is possible to
detect IP packets that have not been munged by the ax25 stack in
ndo_start_xmit and call a function to munge them.
Rename ax25_neigh_xmit to ax25_ip_xmit and tweak the return type and
value to be appropriate for an ndo_start_xmit function.
Update all of the ax25 devices to test the protocol type for ETH_P_IP
and return ax25_ip_xmit as the first thing they do. This preserves
the existing semantics of IP packet processing, but the timing will be
a little different as the IP packets now pass through the qdisc layer
before reaching the ax25 ip packet processing.
Remove the now unnecessary ax25 neighbour table operations.
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
drivers/net/hamradio/6pack.c | 5 ++--
drivers/net/hamradio/baycom_epp.c | 5 ++--
drivers/net/hamradio/bpqether.c | 5 ++--
drivers/net/hamradio/dmascc.c | 5 ++--
drivers/net/hamradio/hdlcdrv.c | 5 ++--
drivers/net/hamradio/mkiss.c | 5 ++--
drivers/net/hamradio/scc.c | 5 ++--
drivers/net/hamradio/yam.c | 5 ++--
include/net/ax25.h | 5 +---
net/ax25/ax25_ip.c | 60 ++++-----------------------------------
10 files changed, 31 insertions(+), 74 deletions(-)
diff --git a/drivers/net/hamradio/6pack.c b/drivers/net/hamradio/6pack.c
index 0b8393ca8c80..7c4a4151ef0f 100644
--- a/drivers/net/hamradio/6pack.c
+++ b/drivers/net/hamradio/6pack.c
@@ -247,6 +247,9 @@ static netdev_tx_t sp_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct sixpack *sp = netdev_priv(dev);
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
spin_lock_bh(&sp->lock);
/* We were not busy, so we are now... :-) */
netif_stop_queue(dev);
@@ -302,7 +305,6 @@ static const struct net_device_ops sp_netdev_ops = {
.ndo_stop = sp_close,
.ndo_start_xmit = sp_xmit,
.ndo_set_mac_address = sp_set_mac_address,
- .ndo_neigh_construct = ax25_neigh_construct,
};
static void sp_setup(struct net_device *dev)
@@ -316,7 +318,6 @@ static void sp_setup(struct net_device *dev)
dev->addr_len = AX25_ADDR_LEN;
dev->type = ARPHRD_AX25;
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->tx_queue_len = 10;
/* Only activated in AX.25 mode */
diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index 3539ab392f7d..83c7cce0d172 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -772,6 +772,9 @@ static int baycom_send_packet(struct sk_buff *skb, struct net_device *dev)
{
struct baycom_state *bc = netdev_priv(dev);
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
if (skb->data[0] != 0) {
do_kiss_params(bc, skb->data, skb->len);
dev_kfree_skb(skb);
@@ -1109,7 +1112,6 @@ static const struct net_device_ops baycom_netdev_ops = {
.ndo_do_ioctl = baycom_ioctl,
.ndo_start_xmit = baycom_send_packet,
.ndo_set_mac_address = baycom_set_mac_address,
- .ndo_neigh_construct = ax25_neigh_construct,
};
/*
@@ -1147,7 +1149,6 @@ static void baycom_probe(struct net_device *dev)
dev->header_ops = &ax25_header_ops;
dev->type = ARPHRD_AX25; /* AF_AX25 device */
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
index bce105b16ed0..63ff08a26da8 100644
--- a/drivers/net/hamradio/bpqether.c
+++ b/drivers/net/hamradio/bpqether.c
@@ -251,6 +251,9 @@ static netdev_tx_t bpq_xmit(struct sk_buff *skb, struct net_device *dev)
struct net_device *orig_dev;
int size;
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
/*
* Just to be *really* sure not to send anything if the interface
* is down, the ethernet device may have gone.
@@ -469,7 +472,6 @@ static const struct net_device_ops bpq_netdev_ops = {
.ndo_start_xmit = bpq_xmit,
.ndo_set_mac_address = bpq_set_mac_address,
.ndo_do_ioctl = bpq_ioctl,
- .ndo_neigh_construct = ax25_neigh_construct,
};
static void bpq_setup(struct net_device *dev)
@@ -487,7 +489,6 @@ static void bpq_setup(struct net_device *dev)
#endif
dev->type = ARPHRD_AX25;
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
dev->mtu = AX25_DEF_PACLEN;
dev->addr_len = AX25_ADDR_LEN;
diff --git a/drivers/net/hamradio/dmascc.c b/drivers/net/hamradio/dmascc.c
index abab7be77406..c3d377770616 100644
--- a/drivers/net/hamradio/dmascc.c
+++ b/drivers/net/hamradio/dmascc.c
@@ -433,7 +433,6 @@ module_exit(dmascc_exit);
static void __init dev_setup(struct net_device *dev)
{
dev->type = ARPHRD_AX25;
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->hard_header_len = AX25_MAX_HEADER_LEN;
dev->mtu = 1500;
dev->addr_len = AX25_ADDR_LEN;
@@ -448,7 +447,6 @@ static const struct net_device_ops scc_netdev_ops = {
.ndo_start_xmit = scc_send_packet,
.ndo_do_ioctl = scc_ioctl,
.ndo_set_mac_address = scc_set_mac_address,
- .ndo_neigh_construct = ax25_neigh_construct,
};
static int __init setup_adapter(int card_base, int type, int n)
@@ -922,6 +920,9 @@ static int scc_send_packet(struct sk_buff *skb, struct net_device *dev)
unsigned long flags;
int i;
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
/* Temporarily stop the scheduler feeding us packets */
netif_stop_queue(dev);
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index 435868a7b69c..49fe59b180a8 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -404,6 +404,9 @@ static netdev_tx_t hdlcdrv_send_packet(struct sk_buff *skb,
{
struct hdlcdrv_state *sm = netdev_priv(dev);
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
if (skb->data[0] != 0) {
do_kiss_params(sm, skb->data, skb->len);
dev_kfree_skb(skb);
@@ -626,7 +629,6 @@ static const struct net_device_ops hdlcdrv_netdev = {
.ndo_start_xmit = hdlcdrv_send_packet,
.ndo_do_ioctl = hdlcdrv_ioctl,
.ndo_set_mac_address = hdlcdrv_set_mac_address,
- .ndo_neigh_construct = ax25_neigh_construct,
};
/*
@@ -677,7 +679,6 @@ static void hdlcdrv_setup(struct net_device *dev)
dev->header_ops = &ax25_header_ops;
dev->type = ARPHRD_AX25; /* AF_AX25 device */
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
dev->mtu = AX25_DEF_PACLEN; /* eth_mtu is the default */
dev->addr_len = AX25_ADDR_LEN; /* sizeof an ax.25 address */
diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index c12ec2c2b594..17058c490b79 100644
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -529,6 +529,9 @@ static netdev_tx_t ax_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mkiss *ax = netdev_priv(dev);
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
if (!netif_running(dev)) {
printk(KERN_ERR "mkiss: %s: xmit call when iface is down\n", dev->name);
return NETDEV_TX_BUSY;
@@ -641,7 +644,6 @@ static const struct net_device_ops ax_netdev_ops = {
.ndo_stop = ax_close,
.ndo_start_xmit = ax_xmit,
.ndo_set_mac_address = ax_set_mac_address,
- .ndo_neigh_construct = ax25_neigh_construct,
};
static void ax_setup(struct net_device *dev)
@@ -651,7 +653,6 @@ static void ax_setup(struct net_device *dev)
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->type = ARPHRD_AX25;
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->tx_queue_len = 10;
dev->header_ops = &ax25_header_ops;
dev->netdev_ops = &ax_netdev_ops;
diff --git a/drivers/net/hamradio/scc.c b/drivers/net/hamradio/scc.c
index b305f51eb420..ce88df33fe17 100644
--- a/drivers/net/hamradio/scc.c
+++ b/drivers/net/hamradio/scc.c
@@ -1550,7 +1550,6 @@ static const struct net_device_ops scc_netdev_ops = {
.ndo_set_mac_address = scc_net_set_mac_address,
.ndo_get_stats = scc_net_get_stats,
.ndo_do_ioctl = scc_net_ioctl,
- .ndo_neigh_construct = ax25_neigh_construct,
};
/* ----> Initialize device <----- */
@@ -1568,7 +1567,6 @@ static void scc_net_setup(struct net_device *dev)
dev->flags = 0;
dev->type = ARPHRD_AX25;
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;
dev->mtu = AX25_DEF_PACLEN;
dev->addr_len = AX25_ADDR_LEN;
@@ -1641,6 +1639,9 @@ static netdev_tx_t scc_net_tx(struct sk_buff *skb, struct net_device *dev)
unsigned long flags;
char kisscmd;
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
if (skb->len > scc->stat.bufsize || skb->len < 2) {
scc->dev_stat.tx_dropped++; /* bogus frame */
dev_kfree_skb(skb);
diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 89d9da7a0c51..1a4729c36aa4 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -597,6 +597,9 @@ static netdev_tx_t yam_send_packet(struct sk_buff *skb,
{
struct yam_port *yp = netdev_priv(dev);
+ if (skb->protocol == htons(ETH_P_IP))
+ return ax25_ip_xmit(skb);
+
skb_queue_tail(&yp->send_queue, skb);
dev->trans_start = jiffies;
return NETDEV_TX_OK;
@@ -1100,7 +1103,6 @@ static const struct net_device_ops yam_netdev_ops = {
.ndo_start_xmit = yam_send_packet,
.ndo_do_ioctl = yam_ioctl,
.ndo_set_mac_address = yam_set_mac_address,
- .ndo_neigh_construct = ax25_neigh_construct,
};
static void yam_setup(struct net_device *dev)
@@ -1129,7 +1131,6 @@ static void yam_setup(struct net_device *dev)
dev->header_ops = &ax25_header_ops;
dev->type = ARPHRD_AX25;
- dev->neigh_priv_len = sizeof(struct ax25_neigh_priv);
dev->hard_header_len = AX25_MAX_HEADER_LEN;
dev->mtu = AX25_MTU;
dev->addr_len = AX25_ADDR_LEN;
diff --git a/include/net/ax25.h b/include/net/ax25.h
index 45feeba7a325..16a923a3a43a 100644
--- a/include/net/ax25.h
+++ b/include/net/ax25.h
@@ -367,11 +367,8 @@ int ax25_kiss_rcv(struct sk_buff *, struct net_device *, struct packet_type *,
struct net_device *);
/* ax25_ip.c */
-int ax25_neigh_construct(struct neighbour *neigh);
+netdev_tx_t ax25_ip_xmit(struct sk_buff *skb);
extern const struct header_ops ax25_header_ops;
-struct ax25_neigh_priv {
- struct neigh_ops ops;
-};
/* ax25_out.c */
ax25_cb *ax25_send_frame(struct sk_buff *, int, ax25_address *, ax25_address *,
diff --git a/net/ax25/ax25_ip.c b/net/ax25/ax25_ip.c
index e030c64ebfb7..8b35af4ef93e 100644
--- a/net/ax25/ax25_ip.c
+++ b/net/ax25/ax25_ip.c
@@ -100,7 +100,7 @@ static int ax25_hard_header(struct sk_buff *skb, struct net_device *dev,
return -AX25_HEADER_LEN; /* Unfinished header */
}
-static int ax25_neigh_xmit(struct sk_buff *skb)
+netdev_tx_t ax25_ip_xmit(struct sk_buff *skb)
{
struct sk_buff *ourskb;
unsigned char *bp = skb->data;
@@ -210,56 +210,7 @@ put:
if (route)
ax25_put_route(route);
- return 1;
-}
-
-static int ax25_neigh_output(struct neighbour *neigh, struct sk_buff *skb)
-{
- /* Except for calling ax25_neigh_xmit instead of
- * dev_queue_xmit this is neigh_resolve_output.
- */
- int rc = 0;
-
- if (!neigh_event_send(neigh, skb)) {
- int err;
- struct net_device *dev = neigh->dev;
- unsigned int seq;
-
- do {
- __skb_pull(skb, skb_network_offset(skb));
- seq = read_seqbegin(&neigh->ha_lock);
- err = dev_hard_header(skb, dev, ntohs(skb->protocol),
- neigh->ha, NULL, skb->len);
- } while (read_seqretry(&neigh->ha_lock, seq));
-
- if (err >= 0) {
- ax25_neigh_xmit(skb);
- } else
- goto out_kfree_skb;
- }
-out:
- return rc;
-
-out_kfree_skb:
- rc = -EINVAL;
- kfree_skb(skb);
- goto out;
-}
-
-int ax25_neigh_construct(struct neighbour *neigh)
-{
- /* This trouble could be saved if ax25 would right a proper
- * dev_queue_xmit function.
- */
- struct ax25_neigh_priv *priv = neighbour_priv(neigh);
-
- if (neigh->tbl->family != AF_INET)
- return -EINVAL;
-
- priv->ops = *neigh->ops;
- priv->ops.output = ax25_neigh_output;
- priv->ops.connected_output = ax25_neigh_output;
- return 0;
+ return NETDEV_TX_OK;
}
#else /* INET */
@@ -271,9 +222,10 @@ static int ax25_hard_header(struct sk_buff *skb, struct net_device *dev,
return -AX25_HEADER_LEN;
}
-int ax25_neigh_construct(struct neighbour *neigh)
+netdev_tx_t ax25_ip_xmit(sturct sk_buff *skb)
{
- return 0;
+ kfree_skb(skb);
+ return NETDEV_TX_OK;
}
#endif
@@ -282,5 +234,5 @@ const struct header_ops ax25_header_ops = {
};
EXPORT_SYMBOL(ax25_header_ops);
-EXPORT_SYMBOL(ax25_neigh_construct);
+EXPORT_SYMBOL(ax25_ip_xmit);
--
2.2.1
--
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