netpoll: fix netpoll_send_udp() bugs

Bogdan Hamciuc diagnosed and fixed following bug in netpoll_send_udp() :

"skb->len += len;" instead of "skb_put(skb, len);"

Meaning that _if_ a network driver needs to call skb_realloc_headroom(),
only packet headers would be copied, leaving garbage in the payload.

However the skb_realloc_headroom() must be avoided as much as possible
since it requires memory and netpoll tries hard to work even if memory
is exhausted (using a pool of preallocated skbs)

It appears netpoll_send_udp() reserved 16 bytes for the ethernet header,
which happens to work for typicall drivers but not all.

Right thing is to use LL_RESERVED_SPACE(dev)
(And also add dev->needed_tailroom of tailroom)

This patch combines both fixes.

Many thanks to Bogdan for raising this issue.

Reported-by: Bogdan Hamciuc <bogdan.hamciuc@freescale.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Tested-by: Bogdan Hamciuc <bogdan.hamciuc@freescale.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Neil Horman <nhorman@tuxdriver.com>
Reviewed-by: Neil Horman <nhorman@tuxdriver.com>
Reviewed-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 3d84fb9d88739629b32c77f1a1d77c7f55ad7630..f9f40b932e4b855fc1a4dc3b3c74620efdc4f970 100644 (file)
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -362,22 +362,23 @@ EXPORT_SYMBOL(netpoll_send_skb_on_dev);
 
 void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 {
-       int total_len, eth_len, ip_len, udp_len;
+       int total_len, ip_len, udp_len;
        struct sk_buff *skb;
        struct udphdr *udph;
        struct iphdr *iph;
        struct ethhdr *eth;
 
        udp_len = len + sizeof(*udph);
-       ip_len = eth_len = udp_len + sizeof(*iph);
-       total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
+       ip_len = udp_len + sizeof(*iph);
+       total_len = ip_len + LL_RESERVED_SPACE(np->dev);
 
-       skb = find_skb(np, total_len, total_len - len);
+       skb = find_skb(np, total_len + np->dev->needed_tailroom,
+                      total_len - len);
        if (!skb)
                return;
 
        skb_copy_to_linear_data(skb, msg, len);
-       skb->len += len;
+       skb_put(skb, len);
 
        skb_push(skb, sizeof(*udph));
        skb_reset_transport_header(skb);