diff options
| author | Simon Horman <horms@verge.net.au> | 2013-05-28 22:34:29 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-05-29 08:49:07 +0200 |
| commit | 7cc461900549fc480eb133948649a1edb7eaaa6f (patch) | |
| tree | 32782f0156c0eb27b2b188d7882e9c2e77d7c8c5 /net/core | |
| parent | sctp: Correct access to skb->{network, transport}_header (diff) | |
| download | linux-7cc461900549fc480eb133948649a1edb7eaaa6f.tar.xz linux-7cc461900549fc480eb133948649a1edb7eaaa6f.zip | |
net, ipv4, ipv6: Correct assignment of skb->network_header to skb->tail
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>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/netpoll.c | 9 | ||||
| -rw-r--r-- | net/core/pktgen.c | 16 |
2 files changed, 22 insertions, 3 deletions
diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 37deedd48bcc..688517c7ff17 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -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); diff --git a/net/core/pktgen.c b/net/core/pktgen.c index 795498fd4587..d2ede89662be 100644 --- a/net/core/pktgen.c +++ b/net/core/pktgen.c @@ -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); |