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net, ipv4, ipv6: Correct assignment of skb->network_header to skb->tail

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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 however skb->network_header is now
an offset.

This patch corrects the problem by adding a wrapper to return skb tail as
an offset regardless of the value of NET_SKBUFF_DATA_USES_OFFSET. It seems
that skb->tail that this offset may be more than 64k and some care has been
taken to treat such cases as an error.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Horman 2013-05-28 20:34:29 +00:00 committed by David S. Miller
parent 158874cac6
commit 7cc4619005
4 changed files with 38 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/skbuff.h
View File

@ -1391,6 +1391,11 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
skb_reset_tail_pointer(skb);
skb->tail += offset;
}
static inline unsigned long skb_tail_offset(const struct sk_buff *skb)
{
return skb->tail;
}
#else /* NET_SKBUFF_DATA_USES_OFFSET */
static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
{
@ -1407,6 +1412,10 @@ static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
skb->tail = skb->data + offset;
}
static inline unsigned long skb_tail_offset(const struct sk_buff *skb)
{
return skb->tail - skb->head;
}
#endif /* NET_SKBUFF_DATA_USES_OFFSET */
/*

9
net/core/netpoll.c
View File

@ -676,6 +676,8 @@ static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo
spin_lock_irqsave(&npinfo->rx_lock, flags);
list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
unsigned long tail_offset;
if (!ipv6_addr_equal(daddr, &np->local_ip.in6))
continue;
@ -700,7 +702,12 @@ static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo
hdr->saddr = *saddr;
hdr->daddr = *daddr;
send_skb->transport_header = send_skb->tail;
tail_offset = skb_tail_offset(skb);
if (tail_offset > 0xffff) {
kfree_skb(send_skb);
continue;
}
skb_set_network_header(send_skb, tail_offset);
skb_put(send_skb, size);
icmp6h = (struct icmp6hdr *)skb_transport_header(skb);

16
net/core/pktgen.c
View File

@ -2642,6 +2642,7 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
__be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */
__be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
u16 queue_map;
unsigned long tail_offset;
if (pkt_dev->nr_labels)
protocol = htons(ETH_P_MPLS_UC);
@ -2708,7 +2709,12 @@ static struct sk_buff *fill_packet_ipv4(struct net_device *odev,
*vlan_encapsulated_proto = htons(ETH_P_IP);
}
skb->network_header = skb->tail;
tail_offset = skb_tail_offset(skb);
if (tail_offset > 0xffff) {
kfree_skb(skb);
return NULL;
}
skb_set_network_header(skb, tail_offset);
skb->transport_header = skb->network_header + sizeof(struct iphdr);
skb_put(skb, sizeof(struct iphdr) + sizeof(struct udphdr));
skb_set_queue_mapping(skb, queue_map);
@ -2775,6 +2781,7 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
__be16 *svlan_tci = NULL; /* Encapsulates priority and SVLAN ID */
__be16 *svlan_encapsulated_proto = NULL; /* packet type ID field (or len) for SVLAN tag */
u16 queue_map;
unsigned long tail_offset;
if (pkt_dev->nr_labels)
protocol = htons(ETH_P_MPLS_UC);
@ -2822,7 +2829,12 @@ static struct sk_buff *fill_packet_ipv6(struct net_device *odev,
*vlan_encapsulated_proto = htons(ETH_P_IPV6);
}
skb->network_header = skb->tail;
tail_offset = skb_tail_offset(skb);
if (tail_offset > 0xffff) {
kfree_skb(skb);
return NULL;
}
skb_set_network_header(skb, tail_offset);
skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);
skb_put(skb, sizeof(struct ipv6hdr) + sizeof(struct udphdr));
skb_set_queue_mapping(skb, queue_map);

8
net/ipv4/ipmr.c
View File

@ -945,6 +945,7 @@ static int ipmr_cache_report(struct mr_table *mrt,
struct igmpmsg *msg;
struct sock *mroute_sk;
int ret;
unsigned long tail_offset;
#ifdef CONFIG_IP_PIMSM
if (assert == IGMPMSG_WHOLEPKT)
@ -980,7 +981,12 @@ static int ipmr_cache_report(struct mr_table *mrt,
/* Copy the IP header */
skb->network_header = skb->tail;
tail_offset = skb_tail_offset(skb);
if (tail_offset > 0xffff) {
kfree_skb(skb);
return -EINVAL;
}
skb_set_network_header(skb, tail_offset);
skb_put(skb, ihl);
skb_copy_to_linear_data(skb, pkt->data, ihl);
ip_hdr(skb)->protocol = 0; /* Flag to the kernel this is a route add */