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-rw-r--r--include/net/inet_sock.h11
-rw-r--r--net/ipv4/ip_sockglue.c64
2 files changed, 47 insertions, 28 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 360b110..605ca42 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -16,7 +16,7 @@
#ifndef _INET_SOCK_H
#define _INET_SOCK_H
-
+#include <linux/bitops.h>
#include <linux/kmemcheck.h>
#include <linux/string.h>
#include <linux/types.h>
@@ -195,6 +195,15 @@ struct inet_sock {
#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
+/* cmsg flags for inet */
+#define IP_CMSG_PKTINFO BIT(0)
+#define IP_CMSG_TTL BIT(1)
+#define IP_CMSG_TOS BIT(2)
+#define IP_CMSG_RECVOPTS BIT(3)
+#define IP_CMSG_RETOPTS BIT(4)
+#define IP_CMSG_PASSSEC BIT(5)
+#define IP_CMSG_ORIGDSTADDR BIT(6)
+
static inline struct inet_sock *inet_sk(const struct sock *sk)
{
return (struct inet_sock *)sk;
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 8a89c73..80f7856 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -45,14 +45,6 @@
#include <linux/errqueue.h>
#include <asm/uaccess.h>
-#define IP_CMSG_PKTINFO 1
-#define IP_CMSG_TTL 2
-#define IP_CMSG_TOS 4
-#define IP_CMSG_RECVOPTS 8
-#define IP_CMSG_RETOPTS 16
-#define IP_CMSG_PASSSEC 32
-#define IP_CMSG_ORIGDSTADDR 64
-
/*
* SOL_IP control messages.
*/
@@ -150,37 +142,55 @@ void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
unsigned int flags = inet->cmsg_flags;
/* Ordered by supposed usage frequency */
- if (flags & 1)
+ if (flags & IP_CMSG_PKTINFO) {
ip_cmsg_recv_pktinfo(msg, skb);
- if ((flags >>= 1) == 0)
- return;
- if (flags & 1)
+ flags &= ~IP_CMSG_PKTINFO;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_TTL) {
ip_cmsg_recv_ttl(msg, skb);
- if ((flags >>= 1) == 0)
- return;
- if (flags & 1)
+ flags &= ~IP_CMSG_TTL;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_TOS) {
ip_cmsg_recv_tos(msg, skb);
- if ((flags >>= 1) == 0)
- return;
- if (flags & 1)
+ flags &= ~IP_CMSG_TOS;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_RECVOPTS) {
ip_cmsg_recv_opts(msg, skb);
- if ((flags >>= 1) == 0)
- return;
- if (flags & 1)
+ flags &= ~IP_CMSG_RECVOPTS;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_RETOPTS) {
ip_cmsg_recv_retopts(msg, skb);
- if ((flags >>= 1) == 0)
- return;
- if (flags & 1)
+ flags &= ~IP_CMSG_RETOPTS;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_PASSSEC) {
ip_cmsg_recv_security(msg, skb);
- if ((flags >>= 1) == 0)
- return;
- if (flags & 1)
+ flags &= ~IP_CMSG_PASSSEC;
+ if (!flags)
+ return;
+ }
+
+ if (flags & IP_CMSG_ORIGDSTADDR)
ip_cmsg_recv_dstaddr(msg, skb);
}
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