From 5961de9f199bef6ff437d7d85fe69b6a1964739b Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Mon, 5 Jan 2015 13:56:16 -0800 Subject: [PATCH] ip: Add offset parameter to ip_cmsg_recv Add ip_cmsg_recv_offset function which takes an offset argument that indicates the starting offset in skb where data is being received from. This will be useful in the case of UDP and provided checksum to user space. ip_cmsg_recv is an inline call to ip_cmsg_recv_offset with offset of zero. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- include/net/ip.h | 7 ++++++- net/ipv4/ip_sockglue.c | 5 +++-- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/include/net/ip.h b/include/net/ip.h index 0bb620702929..0e5a0bae187f 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -537,7 +537,7 @@ int ip_options_rcv_srr(struct sk_buff *skb); */ void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); -void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); +void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset); int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, bool allow_ipv6); int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, @@ -557,6 +557,11 @@ void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, u32 info); +static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) +{ + ip_cmsg_recv_offset(msg, skb, 0); +} + bool icmp_global_allow(void); extern int sysctl_icmp_msgs_per_sec; extern int sysctl_icmp_msgs_burst; diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index 80f78565b41b..513d506ffebb 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -136,7 +136,8 @@ static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb) put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin); } -void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) +void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, + int offset) { struct inet_sock *inet = inet_sk(skb->sk); unsigned int flags = inet->cmsg_flags; @@ -194,7 +195,7 @@ void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) ip_cmsg_recv_dstaddr(msg, skb); } -EXPORT_SYMBOL(ip_cmsg_recv); +EXPORT_SYMBOL(ip_cmsg_recv_offset); int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc, bool allow_ipv6) -- GitLab