• yuan linyu's avatar
    net: introduce __skb_put_[zero, data, u8] · de77b966
    yuan linyu authored
    follow Johannes Berg, semantic patch file as below,
    @@
    identifier p, p2;
    expression len;
    expression skb;
    type t, t2;
    @@
    (
    -p = __skb_put(skb, len);
    +p = __skb_put_zero(skb, len);
    |
    -p = (t)__skb_put(skb, len);
    +p = __skb_put_zero(skb, len);
    )
    ... when != p
    (
    p2 = (t2)p;
    -memset(p2, 0, len);
    |
    -memset(p, 0, len);
    )
    
    @@
    identifier p;
    expression len;
    expression skb;
    type t;
    @@
    (
    -t p = __skb_put(skb, len);
    +t p = __skb_put_zero(skb, len);
    )
    ... when != p
    (
    -memset(p, 0, len);
    )
    
    @@
    type t, t2;
    identifier p, p2;
    expression skb;
    @@
    t *p;
    ...
    (
    -p = __skb_put(skb, sizeof(t));
    +p = __skb_put_zero(skb, sizeof(t));
    |
    -p = (t *)__skb_put(skb, sizeof(t));
    +p = __skb_put_zero(skb, sizeof(t));
    )
    ... when != p
    (
    p2 = (t2)p;
    -memset(p2, 0, sizeof(*p));
    |
    -memset(p, 0, sizeof(*p));
    )
    
    @@
    expression skb, len;
    @@
    -memset(__skb_put(skb, len), 0, len);
    +__skb_put_zero(skb, len);
    
    @@
    expression skb, len, data;
    @@
    -memcpy(__skb_put(skb, len), data, len);
    +__skb_put_data(skb, data, len);
    
    @@
    expression SKB, C, S;
    typedef u8;
    identifier fn = {__skb_put};
    fresh identifier fn2 = fn ## "_u8";
    @@
    - *(u8 *)fn(SKB, S) = C;
    + fn2(SKB, C);
    Signed-off-by: default avataryuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    de77b966
test_bpf.c 139 KB