ipv6: mld: fix add_grhead skb_over_panic for devs with large MTUs

[pandora-kernel.git] / net / ipv4 / igmp.c

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 82af462..03e9486 100644 (file)
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -294,9 +294,7 @@ igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
        return scount;
 }
 
-#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
-
-static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
+static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
 {
        struct sk_buff *skb;
        struct rtable *rt;
@@ -306,6 +304,7 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
        struct flowi4 fl4;
        int hlen = LL_RESERVED_SPACE(dev);
        int tlen = dev->needed_tailroom;
+       unsigned int size = mtu;
 
        while (1) {
                skb = alloc_skb(size + hlen + tlen,
@@ -316,7 +315,6 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
                if (size < 256)
                        return NULL;
        }
-       igmp_skb_size(skb) = size;
 
        rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
                                   0, 0,
@@ -329,6 +327,8 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
        skb_dst_set(skb, &rt->dst);
        skb->dev = dev;
 
+       skb->reserved_tailroom = skb_end_offset(skb) -
+                                min(mtu, skb_end_offset(skb));
        skb_reserve(skb, hlen);
 
        skb_reset_network_header(skb);
@@ -398,8 +398,7 @@ static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
        return skb;
 }
 
-#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
-       skb_tailroom(skb)) : 0)
+#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
 
 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
        int type, int gdeleted, int sdeleted)