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Date: Fri, 18 Nov 2011 20:20:04 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: David Miller <davem@...emloft.net>, eric.dumazet@...il.com,
evonlanthen@...il.com, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, timo.teras@....fi
Subject: [PATCH 3/6] net: Remove all uses of LL_ALLOCATED_SPACE
net: Remove all uses of LL_ALLOCATED_SPACE
The macro LL_ALLOCATED_SPACE was ill-conceived. It applies the
alignment to the sum of needed_headroom and needed_tailroom. As
the amount that is then reserved for head room is needed_headroom
with alignment, this means that the tail room left may be too small.
This patch replaces all uses of LL_ALLOCATED_SPACE with the macro
LL_RESERVED_SPACE and direct reference to needed_tailroom.
This also fixes the problem with needed_headroom changing between
allocating the skb and reserving the head room.
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---
net/core/netpoll.c | 6 ++++--
net/econet/af_econet.c | 7 +++++--
net/ieee802154/dgram.c | 7 +++++--
net/ieee802154/raw.c | 7 +++++--
net/packet/af_packet.c | 18 +++++++++++-------
5 files changed, 30 insertions(+), 15 deletions(-)
diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index cf64c1f..1a7d8e2 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -422,6 +422,7 @@ static void arp_reply(struct sk_buff *skb)
struct sk_buff *send_skb;
struct netpoll *np, *tmp;
unsigned long flags;
+ int hlen, tlen;
int hits = 0;
if (list_empty(&npinfo->rx_np))
@@ -479,8 +480,9 @@ static void arp_reply(struct sk_buff *skb)
if (tip != np->local_ip)
continue;
- send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev),
- LL_RESERVED_SPACE(np->dev));
+ hlen = LL_RESERVED_SPACE(np->dev);
+ tlen = np->dev->needed_tailroom;
+ send_skb = find_skb(np, size + hlen + tlen, hlen);
if (!send_skb)
continue;
diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c
index 1c1f26c..7e717cb 100644
--- a/net/econet/af_econet.c
+++ b/net/econet/af_econet.c
@@ -322,6 +322,7 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
/* Real hardware Econet. We're not worthy etc. */
#ifdef CONFIG_ECONET_NATIVE
unsigned short proto = 0;
+ int hlen, tlen;
int res;
if (len + 15 > dev->mtu) {
@@ -331,12 +332,14 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
dev_hold(dev);
- skb = sock_alloc_send_skb(sk, len + LL_ALLOCATED_SPACE(dev),
+ hlen = LL_RESERVED_SPACE(dev);
+ tlen = dev->needed_tailroom;
+ skb = sock_alloc_send_skb(sk, len + hlen + tlen,
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
goto out_unlock;
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
+ skb_reserve(skb, hlen);
skb_reset_network_header(skb);
eb = (struct ec_cb *)&skb->cb;
diff --git a/net/ieee802154/dgram.c b/net/ieee802154/dgram.c
index faecf64..1b09eaa 100644
--- a/net/ieee802154/dgram.c
+++ b/net/ieee802154/dgram.c
@@ -209,6 +209,7 @@ static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
unsigned mtu;
struct sk_buff *skb;
struct dgram_sock *ro = dgram_sk(sk);
+ int hlen, tlen;
int err;
if (msg->msg_flags & MSG_OOB) {
@@ -229,13 +230,15 @@ static int dgram_sendmsg(struct kiocb *iocb, struct sock *sk,
mtu = dev->mtu;
pr_debug("name = %s, mtu = %u\n", dev->name, mtu);
- skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
+ hlen = LL_RESERVED_SPACE(dev);
+ tlen = dev->needed_tailroom;
+ skb = sock_alloc_send_skb(sk, hlen + tlen + size,
msg->msg_flags & MSG_DONTWAIT,
&err);
if (!skb)
goto out_dev;
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
+ skb_reserve(skb, hlen);
skb_reset_network_header(skb);
diff --git a/net/ieee802154/raw.c b/net/ieee802154/raw.c
index 10970ca..f96bae8 100644
--- a/net/ieee802154/raw.c
+++ b/net/ieee802154/raw.c
@@ -108,6 +108,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
struct net_device *dev;
unsigned mtu;
struct sk_buff *skb;
+ int hlen, tlen;
int err;
if (msg->msg_flags & MSG_OOB) {
@@ -137,12 +138,14 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
goto out_dev;
}
- skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + size,
+ hlen = LL_RESERVED_SPACE(dev);
+ tlen = dev->needed_tailroom;
+ skb = sock_alloc_send_skb(sk, hlen + tlen + size,
msg->msg_flags & MSG_DONTWAIT, &err);
if (!skb)
goto out_dev;
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
+ skb_reserve(skb, hlen);
skb_reset_mac_header(skb);
skb_reset_network_header(skb);
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 82a6f34..71c1a75 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1944,7 +1944,7 @@ static void tpacket_destruct_skb(struct sk_buff *skb)
static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
void *frame, struct net_device *dev, int size_max,
- __be16 proto, unsigned char *addr)
+ __be16 proto, unsigned char *addr, int hlen)
{
union {
struct tpacket_hdr *h1;
@@ -1978,7 +1978,7 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
return -EMSGSIZE;
}
- skb_reserve(skb, LL_RESERVED_SPACE(dev));
+ skb_reserve(skb, hlen);
skb_reset_network_header(skb);
data = ph.raw + po->tp_hdrlen - sizeof(struct sockaddr_ll);
@@ -2053,6 +2053,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
unsigned char *addr;
int len_sum = 0;
int status = 0;
+ int hlen, tlen;
mutex_lock(&po->pg_vec_lock);
@@ -2101,16 +2102,17 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg)
}
status = TP_STATUS_SEND_REQUEST;
+ hlen = LL_RESERVED_SPACE(dev);
+ tlen = dev->needed_tailroom;
skb = sock_alloc_send_skb(&po->sk,
- LL_ALLOCATED_SPACE(dev)
- + sizeof(struct sockaddr_ll),
+ hlen + tlen + sizeof(struct sockaddr_ll),
0, &err);
if (unlikely(skb == NULL))
goto out_status;
tp_len = tpacket_fill_skb(po, skb, ph, dev, size_max, proto,
- addr);
+ addr, hlen);
if (unlikely(tp_len < 0)) {
if (po->tp_loss) {
@@ -2207,6 +2209,7 @@ static int packet_snd(struct socket *sock,
int vnet_hdr_len;
struct packet_sock *po = pkt_sk(sk);
unsigned short gso_type = 0;
+ int hlen, tlen;
/*
* Get and verify the address.
@@ -2291,8 +2294,9 @@ static int packet_snd(struct socket *sock,
goto out_unlock;
err = -ENOBUFS;
- skb = packet_alloc_skb(sk, LL_ALLOCATED_SPACE(dev),
- LL_RESERVED_SPACE(dev), len, vnet_hdr.hdr_len,
+ hlen = LL_RESERVED_SPACE(dev);
+ tlen = dev->needed_tailroom;
+ skb = packet_alloc_skb(sk, hlen + tlen, hlen, len, vnet_hdr.hdr_len,
msg->msg_flags & MSG_DONTWAIT, &err);
if (skb == NULL)
goto out_unlock;
--
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