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Message-ID: <20170328165732.GA11602@arushi-HP-Pavilion-Notebook>
Date: Tue, 28 Mar 2017 22:27:32 +0530
From: Arushi Singhal <arushisinghal19971997@...il.com>
To: outreachy-kernel@...glegroups.com
Cc: Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>, davem@...emloft.net,
netfilter-devel@...r.kernel.org, coreteam@...filter.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v3] net: netfilter: Add nfnl_msg_type() helper function
To remove complexity of code the function is added in nfnetlink.h
to make code more clear and readable.
This is opencoded in a way that makes it error prone for future
netfilter netlink subsystems.
Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>
---
changes in v3
-make the subject more clear.
include/linux/netfilter/nfnetlink.h | 6 ++++++
net/netfilter/nf_conntrack_netlink.c | 12 +++++++-----
net/netfilter/nfnetlink_acct.c | 2 +-
net/netfilter/nfnetlink_cthelper.c | 2 +-
net/netfilter/nfnetlink_cttimeout.c | 4 ++--
5 files changed, 17 insertions(+), 9 deletions(-)
diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h
index 1b49209dd5c7..9a36a7c3145d 100644
--- a/include/linux/netfilter/nfnetlink.h
+++ b/include/linux/netfilter/nfnetlink.h
@@ -50,6 +50,12 @@ static inline bool lockdep_nfnl_is_held(__u8 subsys_id)
{
return true;
}
+
+static inline u16 nfnl_msg_type(u8 subsys, u8 msg_type)
+{
+ return subsys << 8 | msg_type;
+}
+
#endif /* CONFIG_PROVE_LOCKING */
/*
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index aa344c5868c5..67f6f88a3e92 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -467,7 +467,7 @@ ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
struct nlattr *nest_parms;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
- event = NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_NEW;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
@@ -1983,7 +1983,8 @@ ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
struct nfgenmsg *nfmsg;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
- event = NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS_CPU;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
+ IPCTNL_MSG_CT_GET_STATS_CPU);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
@@ -2066,7 +2067,7 @@ ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
unsigned int nr_conntracks = atomic_read(&net->ct.count);
- event = NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_CT_GET_STATS;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
@@ -2576,7 +2577,7 @@ ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
struct nfgenmsg *nfmsg;
unsigned int flags = portid ? NLM_F_MULTI : 0;
- event |= NFNL_SUBSYS_CTNETLINK_EXP << 8;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
@@ -3223,7 +3224,8 @@ ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
struct nfgenmsg *nfmsg;
unsigned int flags = portid ? NLM_F_MULTI : 0, event;
- event = NFNL_SUBSYS_CTNETLINK << 8 | IPCTNL_MSG_EXP_GET_STATS_CPU;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
+ IPCTNL_MSG_EXP_GET_STATS_CPU);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
diff --git a/net/netfilter/nfnetlink_acct.c b/net/netfilter/nfnetlink_acct.c
index d44d89b56127..ae0aef6cb7ee 100644
--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -138,7 +138,7 @@ nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
u64 pkts, bytes;
u32 old_flags;
- event |= NFNL_SUBSYS_ACCT << 8;
+ event = nfnl_msg_type(NFNL_SUBSYS_ACCT, event);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
diff --git a/net/netfilter/nfnetlink_cthelper.c b/net/netfilter/nfnetlink_cthelper.c
index de8782345c86..e2c443c43cb9 100644
--- a/net/netfilter/nfnetlink_cthelper.c
+++ b/net/netfilter/nfnetlink_cthelper.c
@@ -416,7 +416,7 @@ nfnl_cthelper_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
unsigned int flags = portid ? NLM_F_MULTI : 0;
int status;
- event |= NFNL_SUBSYS_CTHELPER << 8;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTHELPER, event);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
index 139e0867e56e..6d76172117e4 100644
--- a/net/netfilter/nfnetlink_cttimeout.c
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -158,7 +158,7 @@ ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
unsigned int flags = portid ? NLM_F_MULTI : 0;
struct nf_conntrack_l4proto *l4proto = timeout->l4proto;
- event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
@@ -431,7 +431,7 @@ cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
struct nfgenmsg *nfmsg;
unsigned int flags = portid ? NLM_F_MULTI : 0;
- event |= NFNL_SUBSYS_CTNETLINK_TIMEOUT << 8;
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
if (nlh == NULL)
goto nlmsg_failure;
--
2.11.0
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