diff mbox series

[net-next,2/2] inet: udp{4|6}_lib_lookup_skb() skb argument is const

Message ID 20201109231349.20946-3-eric.dumazet@gmail.com
State New
Headers show
Series inet: prevent skb changes in udp{4|6}_lib_lookup_skb() | expand

Commit Message

Eric Dumazet Nov. 9, 2020, 11:13 p.m. UTC 
From: Eric Dumazet <edumazet@google.com>

The skb is needed only to fetch the keys for the lookup.

Both functions are used from GRO stack, we do not want
accidental modification of the skb.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexander Lobakin <alobakin@pm.me>
---
 include/net/udp.h | 6 +++---
 net/ipv4/udp.c    | 2 +-
 net/ipv6/udp.c    | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/include/net/udp.h b/include/net/udp.h
index 295d52a73598277dc5071536f777d1a87e7df1d1..877832bed4713a011a514a2f6f522728c8c89e20 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -164,7 +164,7 @@  static inline void udp_csum_pull_header(struct sk_buff *skb)
 	UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
 }
 
-typedef struct sock *(*udp_lookup_t)(struct sk_buff *skb, __be16 sport,
+typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, __be16 sport,
 				     __be16 dport);
 
 INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
@@ -313,7 +313,7 @@  struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
 struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
 			       __be32 daddr, __be16 dport, int dif, int sdif,
 			       struct udp_table *tbl, struct sk_buff *skb);
-struct sock *udp4_lib_lookup_skb(struct sk_buff *skb,
+struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
 				 __be16 sport, __be16 dport);
 struct sock *udp6_lib_lookup(struct net *net,
 			     const struct in6_addr *saddr, __be16 sport,
@@ -324,7 +324,7 @@  struct sock *__udp6_lib_lookup(struct net *net,
 			       const struct in6_addr *daddr, __be16 dport,
 			       int dif, int sdif, struct udp_table *tbl,
 			       struct sk_buff *skb);
-struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
+struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
 				 __be16 sport, __be16 dport);
 
 /* UDP uses skb->dev_scratch to cache as much information as possible and avoid
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ca04a8a35e52dbcff50b03da2710726dc6ee98bd..8c9f08343e171ba9b78ebe7bfe22e6508ab15c42 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -541,7 +541,7 @@  static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
 				 inet_sdif(skb), udptable, skb);
 }
 
-struct sock *udp4_lib_lookup_skb(struct sk_buff *skb,
+struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
 				 __be16 sport, __be16 dport)
 {
 	const struct iphdr *iph = ip_hdr(skb);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index cde9b8874d4bce4cdbee557d89a0be0ddf3f87df..c32f50d2a0694580426ea71e52a1cee23ed07045 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -276,7 +276,7 @@  static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
 				 inet6_sdif(skb), udptable, skb);
 }
 
-struct sock *udp6_lib_lookup_skb(struct sk_buff *skb,
+struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
 				 __be16 sport, __be16 dport)
 {
 	const struct ipv6hdr *iph = ipv6_hdr(skb);