From eb9672f4a14bb7058c44efcc31c89737a7724d2c Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Thu, 1 May 2014 18:34:20 +0200 Subject: [PATCH] net: filter: misc/various cleanups This contains only some minor misc cleanpus. We can spare us the extra variable declaration in __skb_get_pay_offset(), the cast in __get_random_u32() is rather unnecessary and in __sk_migrate_realloc() we can remove the memcpy() and do a direct assignment of the structs. Latter was suggested by Fengguang Wu found with coccinelle. Also, remaining pointer casts of long should be unsigned long instead. Suggested-by: Fengguang Wu Signed-off-by: Daniel Borkmann Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- net/core/filter.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/net/core/filter.c b/net/core/filter.c index c93ca8d..eb020a7 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -78,9 +78,9 @@ void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, int k, uns ptr = skb_network_header(skb) + k - SKF_NET_OFF; else if (k >= SKF_LL_OFF) ptr = skb_mac_header(skb) + k - SKF_LL_OFF; - if (ptr >= skb->head && ptr + size <= skb_tail_pointer(skb)) return ptr; + return NULL; } @@ -89,6 +89,7 @@ static inline void *load_pointer(const struct sk_buff *skb, int k, { if (k >= 0) return skb_header_pointer(skb, k, size, buffer); + return bpf_internal_load_pointer_neg_helper(skb, k, size); } @@ -598,14 +599,12 @@ static unsigned int pkt_type_offset(void) static u64 __skb_get_pay_offset(u64 ctx, u64 a, u64 x, u64 r4, u64 r5) { - struct sk_buff *skb = (struct sk_buff *)(long) ctx; - - return __skb_get_poff(skb); + return __skb_get_poff((struct sk_buff *)(unsigned long) ctx); } static u64 __skb_get_nlattr(u64 ctx, u64 a, u64 x, u64 r4, u64 r5) { - struct sk_buff *skb = (struct sk_buff *)(long) ctx; + struct sk_buff *skb = (struct sk_buff *)(unsigned long) ctx; struct nlattr *nla; if (skb_is_nonlinear(skb)) @@ -626,7 +625,7 @@ static u64 __skb_get_nlattr(u64 ctx, u64 a, u64 x, u64 r4, u64 r5) static u64 __skb_get_nlattr_nest(u64 ctx, u64 a, u64 x, u64 r4, u64 r5) { - struct sk_buff *skb = (struct sk_buff *)(long) ctx; + struct sk_buff *skb = (struct sk_buff *)(unsigned long) ctx; struct nlattr *nla; if (skb_is_nonlinear(skb)) @@ -657,7 +656,7 @@ static u64 __get_raw_cpu_id(u64 ctx, u64 a, u64 x, u64 r4, u64 r5) /* note that this only generates 32-bit random numbers */ static u64 __get_random_u32(u64 ctx, u64 a, u64 x, u64 r4, u64 r5) { - return (u64)prandom_u32(); + return prandom_u32(); } static bool convert_bpf_extensions(struct sock_filter *fp, @@ -1475,7 +1474,7 @@ static struct sk_filter *__sk_migrate_realloc(struct sk_filter *fp, fp_new = sock_kmalloc(sk, len, GFP_KERNEL); if (fp_new) { - memcpy(fp_new, fp, sizeof(struct sk_filter)); + *fp_new = *fp; /* As we're kepping orig_prog in fp_new along, * we need to make sure we're not evicting it * from the old fp. -- 2.7.4