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Date: Wed, 29 May 2013 15:34:26 +0900
From: Simon Horman <horms@...ge.net.au>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Simon Horman <horms@...ge.net.au>
Subject: [PATCH net-next v2 4/7] ipv6: Correct comparisons and calculations using skb->tail and skb-transport_header
This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer whereas skb->transport_header
will be an offset from head. This is corrected by using wrappers that
ensure that comparisons and calculations are always made using pointers.
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
net/ipv6/exthdrs_core.c | 2 +-
net/ipv6/icmp.c | 2 +-
net/ipv6/mcast.c | 5 +++--
net/ipv6/mip6.c | 6 ++++--
net/ipv6/ndisc.c | 9 +++++----
net/ipv6/output_core.c | 3 ++-
net/ipv6/raw.c | 3 ++-
net/ipv6/route.c | 2 +-
8 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/net/ipv6/exthdrs_core.c b/net/ipv6/exthdrs_core.c
index c5e83fa..140748d 100644
--- a/net/ipv6/exthdrs_core.c
+++ b/net/ipv6/exthdrs_core.c
@@ -115,7 +115,7 @@ EXPORT_SYMBOL(ipv6_skip_exthdr);
int ipv6_find_tlv(struct sk_buff *skb, int offset, int type)
{
const unsigned char *nh = skb_network_header(skb);
- int packet_len = skb->tail - skb->network_header;
+ int packet_len = skb_tail_pointer(skb) - skb_network_header(skb);
struct ipv6_opt_hdr *hdr;
int len;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 1d2902e..4b4890b 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -399,7 +399,7 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
int err = 0;
if ((u8 *)hdr < skb->head ||
- (skb->network_header + sizeof(*hdr)) > skb->tail)
+ (skb_network_header(skb) + sizeof(*hdr)) > skb_tail_pointer(skb))
return;
/*
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index bfa6cc3..72c8bfe 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1409,8 +1409,9 @@ static void mld_sendpack(struct sk_buff *skb)
idev = __in6_dev_get(skb->dev);
IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
- payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
- mldlen = skb->tail - skb->transport_header;
+ payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
+ sizeof(*pip6);
+ mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
pip6->payload_len = htons(payload_len);
pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index 0f9bdc5..9ac01dc 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -268,7 +268,8 @@ static int mip6_destopt_offset(struct xfrm_state *x, struct sk_buff *skb,
struct ipv6_opt_hdr *exthdr =
(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
const unsigned char *nh = skb_network_header(skb);
- unsigned int packet_len = skb->tail - skb->network_header;
+ unsigned int packet_len = skb_tail_pointer(skb) -
+ skb_network_header(skb);
int found_rhdr = 0;
*nexthdr = &ipv6_hdr(skb)->nexthdr;
@@ -404,7 +405,8 @@ static int mip6_rthdr_offset(struct xfrm_state *x, struct sk_buff *skb,
struct ipv6_opt_hdr *exthdr =
(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
const unsigned char *nh = skb_network_header(skb);
- unsigned int packet_len = skb->tail - skb->network_header;
+ unsigned int packet_len = skb_tail_pointer(skb) -
+ skb_network_header(skb);
int found_rhdr = 0;
*nexthdr = &ipv6_hdr(skb)->nexthdr;
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index a096269..781dd3c 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -693,7 +693,7 @@ static void ndisc_recv_ns(struct sk_buff *skb)
const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
u8 *lladdr = NULL;
- u32 ndoptlen = skb->tail - (skb->transport_header +
+ u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
offsetof(struct nd_msg, opt));
struct ndisc_options ndopts;
struct net_device *dev = skb->dev;
@@ -853,7 +853,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
u8 *lladdr = NULL;
- u32 ndoptlen = skb->tail - (skb->transport_header +
+ u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
offsetof(struct nd_msg, opt));
struct ndisc_options ndopts;
struct net_device *dev = skb->dev;
@@ -1069,7 +1069,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
__u8 * opt = (__u8 *)(ra_msg + 1);
- optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
+ optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -
+ sizeof(struct ra_msg);
if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK(2, warn, "RA: source address is not link-local\n");
@@ -1346,7 +1347,7 @@ static void ndisc_redirect_rcv(struct sk_buff *skb)
u8 *hdr;
struct ndisc_options ndopts;
struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb);
- u32 ndoptlen = skb->tail - (skb->transport_header +
+ u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
offsetof(struct rd_msg, opt));
#ifdef CONFIG_IPV6_NDISC_NODETYPE
diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index c2e73e6..ab92a36 100644
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -40,7 +40,8 @@ int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
u16 offset = sizeof(struct ipv6hdr);
struct ipv6_opt_hdr *exthdr =
(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
- unsigned int packet_len = skb->tail - skb->network_header;
+ unsigned int packet_len = skb_tail_pointer(skb) -
+ skb_network_header(skb);
int found_rhdr = 0;
*nexthdr = &ipv6_hdr(skb)->nexthdr;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index eedff8c..4f8886a 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1132,7 +1132,8 @@ static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
spin_lock_bh(&sk->sk_receive_queue.lock);
skb = skb_peek(&sk->sk_receive_queue);
if (skb != NULL)
- amount = skb->tail - skb->transport_header;
+ amount = skb_tail_pointer(skb) -
+ skb_transport_header(skb);
spin_unlock_bh(&sk->sk_receive_queue.lock);
return put_user(amount, (int __user *)arg);
}
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 194c3cd..2b87418 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1649,7 +1649,7 @@ static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_bu
int optlen, on_link;
u8 *lladdr;
- optlen = skb->tail - skb->transport_header;
+ optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
optlen -= sizeof(*msg);
if (optlen < 0) {
--
1.7.10.4
--
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