Collect statistics from other network namespace

This patch implements how to collect statistics for other netns
by using `setns` to switch to another netns to read /proc files,
and then use shared memory for parent-child IPC.

Combined with actual needs and performance considerations, this
patch only collects other netns's physical network devices stats.
Virtual devices are ignored except the 'lo'.

Signed-off-by: Fei Li <[email protected]>

Makefile

@@ -21,6 +21,7 @@ PMPATH2  = /usr/lib64/pm-utils/sleep.d
 PMPATHD  = /usr/lib/systemd/system-sleep
 
 CFLAGS  += -O2 -I. -Wall -Wno-stringop-truncation -Wmissing-prototypes -Wmissing-declarations # -DNOPERFEVENT   # -DHTTPSTATS
+LDFLAGS  = -lpthread
 OBJMOD0  = version.o
 OBJMOD1  = various.o  deviate.o   procdbase.o
 OBJMOD2  = acctproc.o photoproc.o photosyst.o  rawlog.o ifprop.o parseable.o

ifprop.c

@@ -55,7 +55,6 @@ typedef __u8	u8;
 #include "photosyst.h"
 
 static int		calcbucket(char *);
-static int		getphysprop(struct ifprop *);
 
 /*
 ** hash table for linked lists with *all* interfaces
@@ -304,7 +303,7 @@ calcbucket(char *p)
 **
 ** return value reflects true (success) or false (unknown interface type)
 */
-static int
+int
 getphysprop(struct ifprop *p)
 {
 	int sockfd;
@@ -440,3 +439,26 @@ getphysprop(struct ifprop *p)
 
 	return 1;
 }
+
+int getbusinfo(struct ifprop *p) {
+	int			sockfd, ret = 0;
+	struct ifreq		ifreq;
+	struct ethtool_drvinfo	drv;
+
+	if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) == -1 )
+		return 0;
+
+	memset(&ifreq, 0, sizeof ifreq);
+	strncpy((void *)&ifreq.ifr_ifrn.ifrn_name, p->name,
+			sizeof ifreq.ifr_ifrn.ifrn_name - 1);
+
+	drv.cmd = ETHTOOL_GDRVINFO;
+	ifreq.ifr_ifru.ifru_data = (void *)&drv;
+	if ( ioctl(sockfd, SIOCETHTOOL, &ifreq) == 0 )
+		if ( strlen(drv.bus_info) > 0 )
+			ret = 1;
+
+	close(sockfd);
+
+	return ret;
+}

ifprop.h

@@ -39,3 +39,5 @@ struct ifprop	{
 
 int 	getifprop(struct ifprop *);
 void 	initifprop(void);
+int	getphysprop(struct ifprop *);
+int 	getbusinfo(struct ifprop *);