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authorBen Hutchings <bhutchings@solarflare.com>2012-01-17 07:57:56 +0000
committerDavid S. Miller <davem@davemloft.net>2012-01-17 15:49:03 -0500
commit36c92474498ad6cc3afb24b91a67a444d79978fe (patch)
tree6e847f5256b6ef429ca1a8ea85ede022d0c53cbe /net
parent4144cb2ade46d97b9c41682fd2e9064a59f23a98 (diff)
net: WARN if skb_checksum_help() is called on skb requiring segmentation
skb_checksum_help() has never done anything useful with skbs that require segmentation. Setting skb->ip_summed = CHECKSUM_NONE makes them invalid and provokes a later WARNing in skb_gso_segment(). Passing such an skb to skb_checksum_help() indicates a bug, so we should warn about it immediately. Move the warning from skb_gso_segment() into a shared function, and add gso_type and gso_size to it. Signed-off-by: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dev.c31
1 files changed, 19 insertions, 12 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 7e6b7dcaacde..17db2f2e5236 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1887,6 +1887,22 @@ void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
EXPORT_SYMBOL(skb_set_dev);
#endif /* CONFIG_NET_NS */
+static void skb_warn_bad_offload(const struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+ const char *driver = "";
+
+ if (dev && dev->dev.parent)
+ driver = dev_driver_string(dev->dev.parent);
+
+ WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
+ "gso_type=%d ip_summed=%d\n",
+ driver, dev ? &dev->features : NULL,
+ skb->sk ? &skb->sk->sk_route_caps : NULL,
+ skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
+ skb_shinfo(skb)->gso_type, skb->ip_summed);
+}
+
/*
* Invalidate hardware checksum when packet is to be mangled, and
* complete checksum manually on outgoing path.
@@ -1900,8 +1916,8 @@ int skb_checksum_help(struct sk_buff *skb)
goto out_set_summed;
if (unlikely(skb_shinfo(skb)->gso_size)) {
- /* Let GSO fix up the checksum. */
- goto out_set_summed;
+ skb_warn_bad_offload(skb);
+ return -EINVAL;
}
offset = skb_checksum_start_offset(skb);
@@ -1961,16 +1977,7 @@ struct sk_buff *skb_gso_segment(struct sk_buff *skb,
__skb_pull(skb, skb->mac_len);
if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
- struct net_device *dev = skb->dev;
- const char *driver = "";
-
- if (dev && dev->dev.parent)
- driver = dev_driver_string(dev->dev.parent);
-
- WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d ip_summed=%d\n",
- driver, dev ? &dev->features : NULL,
- skb->sk ? &skb->sk->sk_route_caps : NULL,
- skb->len, skb->data_len, skb->ip_summed);
+ skb_warn_bad_offload(skb);
if (skb_header_cloned(skb) &&
(err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))