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monitor: Print RTNL LINK messages

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Print RTM_NEWLINK, RTM_DELLINK, RTM_SETLINK and RTM_GETLINK
messages header, flags and its attributes.
This commit is contained in:
Ravi kumar Veeramally 2015-02-04 13:06:28 +02:00 committed by Denis Kenzior
parent 33b06a1241
commit 30573d71c5
1 changed files with 238 additions and 1 deletions
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239
monitor/nlmon.c
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@ -32,13 +32,14 @@
#include <sys/socket.h> #include <sys/socket.h>
#include <arpa/inet.h> #include <arpa/inet.h>
#include <linux/if.h> #include <linux/if.h>
#include <linux/if_arp.h>
#include <linux/if_packet.h> #include <linux/if_packet.h>
#include <linux/if_ether.h> #include <linux/if_ether.h>
#include <linux/netlink.h> #include <linux/netlink.h>
#include <linux/genetlink.h> #include <linux/genetlink.h>
#include <linux/rtnetlink.h> #include <linux/rtnetlink.h>
#include <linux/filter.h> #include <linux/filter.h>
#include <net/ethernet.h>
#include <netinet/ether.h>
#include <ell/ell.h> #include <ell/ell.h>
#ifndef ARPHRD_NETLINK #ifndef ARPHRD_NETLINK
@ -131,6 +132,11 @@ struct attr_entry {
}; };
}; };
struct flag_names {
uint16_t flag;
const char *name;
};
static void nlmon_req_free(void *data) static void nlmon_req_free(void *data)
{ {
struct nlmon_req *req = data; struct nlmon_req *req = data;
@ -2124,6 +2130,228 @@ static void genl_ctrl(struct nlmon *nlmon, const void *data, uint32_t len)
nlmon->id = id; nlmon->id = id;
} }
static void print_ifi_addr(unsigned int indent, const char *str,
const void *buf, uint16_t size)
{
struct ether_addr eth;
if (size != ETH_ALEN) {
printf("malformed packet\n");
return;
}
memcpy(&eth, buf, ETH_ALEN);
print_attr(indent, "%s: %s", str, ether_ntoa(&eth));
}
static struct attr_entry info_entry[] = {
{ IFLA_ADDRESS, "Interface Address", ATTR_CUSTOM,
{ .function = print_ifi_addr } },
{ IFLA_BROADCAST, "Broadcast Address", ATTR_CUSTOM,
{ .function = print_ifi_addr } },
{ IFLA_IFNAME, "IfName", ATTR_STRING },
{ IFLA_MASTER, "Master", ATTR_U32 },
{ IFLA_MTU, "MTU", ATTR_U32 },
{ IFLA_TXQLEN, "Txqlen", ATTR_U32 },
{ IFLA_OPERSTATE, "Openstate", ATTR_U8 },
{ IFLA_LINKMODE, "LinkMode", ATTR_U8 },
{ IFLA_LINK, "Link", ATTR_S32 },
{ IFLA_QDISC, "Qdisc", ATTR_STRING },
{ IFLA_STATS, "Stats", ATTR_BINARY },
{ IFLA_MAP, "Map", ATTR_BINARY },
{ IFLA_WIRELESS, "Wireless", ATTR_BINARY },
{ IFLA_COST, "Cost", ATTR_BINARY },
{ IFLA_PRIORITY, "Priority", ATTR_BINARY },
{ IFLA_PROTINFO, "ProtInfo", ATTR_BINARY },
{ IFLA_WEIGHT, "Weight", ATTR_BINARY },
{ IFLA_NET_NS_PID, "NetNSPid", ATTR_BINARY },
{ IFLA_IFALIAS, "IFAlias", ATTR_BINARY },
{ },
};
static void print_rtnl_attributes(int indent, const struct attr_entry *table,
struct rtattr *rt_attr, int len)
{
struct rtattr *attr;
const char *str;
int i;
if (!table || !rt_attr)
return;
for (attr = rt_attr; RTA_OK(attr, len); attr = RTA_NEXT(attr, len)) {
uint16_t rta_type = attr->rta_type;
enum attr_type type = ATTR_UNSPEC;
attr_func_t function;
uint64_t val64;
uint32_t val32;
uint16_t val16;
uint8_t val8;
int32_t val_s32;
int64_t val_s64;
str = "Reserved";
for (i = 0; table[i].str; i++) {
if (rta_type == table[i].attr) {
str = table[i].str;
type = table[i].type;
function = table[i].function;
break;
}
}
switch (type) {
case ATTR_CUSTOM:
if (function)
function(indent, str, RTA_DATA(attr),
RTA_PAYLOAD(attr));
else
printf("missing function\n");
break;
case ATTR_STRING:
print_attr(indent, "%s: %s", str,
(char *) RTA_DATA(attr));
break;
case ATTR_U8:
val8 = *((uint8_t *) RTA_DATA(attr));
print_attr(indent, "%s: %"PRIu8" (0x%02"PRIx8")", str,
val8, val8);
if (RTA_PAYLOAD(attr) != 1)
printf("malformed packet\n");
break;
case ATTR_U16:
val16 = *((uint16_t *) RTA_DATA(attr));
print_attr(indent, "%s: %"PRIu16" (0x%04"PRIx16")", str,
val16, val16);
if (RTA_PAYLOAD(attr) != 2)
printf("malformed packet\n");
break;
case ATTR_U32:
val32 = *((uint32_t *) RTA_DATA(attr));
print_attr(indent, "%s: %"PRIu32" (0x%08"PRIx32")", str,
val32, val32);
if (RTA_PAYLOAD(attr) != 4)
printf("malformed packet\n");
break;
case ATTR_U64:
val64 = *((uint64_t *) RTA_DATA(attr));
print_attr(indent, "%s: %"PRIu64" (0x%016"PRIx64")",
str, val64, val64);
if (RTA_PAYLOAD(attr) != 8)
printf("malformed packet\n");
break;
case ATTR_S32:
val_s32 = *((int32_t *) RTA_DATA(attr));
print_attr(indent, "%s: %"PRId32, str, val_s32);
if (RTA_PAYLOAD(attr) != 4)
printf("malformed packet\n");
break;
case ATTR_S64:
val_s64 = *((int64_t *) RTA_DATA(attr));
print_attr(indent, "%s: %"PRId64, str, val_s64);
if (RTA_PAYLOAD(attr) != 8)
printf("malformed packet\n");
break;
case ATTR_FLAG:
print_attr(indent, "%s: true", str);
if (RTA_PAYLOAD(attr) != 0)
printf("malformed packet\n");
break;
case ATTR_FLAG_OR_U16:
if (RTA_PAYLOAD(attr) == 0)
print_attr(indent, "%s: true", str);
else if (RTA_PAYLOAD(attr) == 2) {
val16 = *((uint16_t *) RTA_DATA(attr));
print_attr(indent,
"%s: %"PRIu16" (0x%04"PRIx16")",
str, val16, val16);
} else
printf("malformed packet\n");
break;
case ATTR_BINARY:
print_attr(indent, "%s: len %lu", str,
RTA_PAYLOAD(attr));
print_hexdump(indent + 1,
RTA_DATA(attr), RTA_PAYLOAD(attr));
break;
case ATTR_ADDRESS:
case ATTR_NESTED:
case ATTR_ARRAY:
case ATTR_UNSPEC:
print_attr(indent, "%s: len %lu", str,
RTA_PAYLOAD(attr));
break;
}
}
}
static struct flag_names rtnl_flags[] = {
{ IFF_UP, "up" },
{ IFF_BROADCAST, "broadcast" },
{ IFF_DEBUG, "debug" },
{ IFF_LOOPBACK, "loopback" },
{ IFF_POINTOPOINT, "pointopoint"},
{ IFF_NOTRAILERS, "notrailers" },
{ IFF_RUNNING, "running" },
{ IFF_NOARP, "noarp" },
{ IFF_PROMISC, "promisc" },
{ IFF_ALLMULTI, "allmulti" },
{ IFF_MASTER, "master" },
{ IFF_SLAVE, "slave" },
{ IFF_MULTICAST, "multicast" },
{ IFF_PORTSEL, "portsel" },
{ IFF_AUTOMEDIA, "automedia" },
{ IFF_DYNAMIC, "dynamic" },
{ },
};
static void ififlags_str(char *str, size_t size, uint16_t flags)
{
int pos, i;
if (!str || !flags)
return;
pos = sprintf(str, "(0x%02x)", flags);
pos += sprintf(str + pos, " [");
for (i = 0; rtnl_flags[i].name; i++) {
if (flags & rtnl_flags[i].flag) {
flags &= ~rtnl_flags[i].flag;
pos += sprintf(str + pos, "%s%c", rtnl_flags[i].name,
flags ? ',' : ']');
}
}
if (flags)
pos += sprintf(str + pos, "0x%x]", flags);
}
static void print_ifinfomsg(const struct ifinfomsg *info)
{
char str[64];
if (!info)
return;
print_field("IFLA Family: %u", info->ifi_family);
print_field("IFLA Type: %u", info->ifi_type);
print_field("IFLA Index: %d", info->ifi_index);
print_field("IFLA ChangeMask: %u", info->ifi_change);
ififlags_str(str, sizeof(str), info->ifi_flags);
print_field("IFLA Flags: %s", str);
}
static void print_rtm_link(uint16_t type, const struct ifinfomsg *info, int len)
{
if (!info || len <= 0)
return;
print_ifinfomsg(info);
print_rtnl_attributes(1, info_entry, IFLA_RTA(info), len);
}
static const char *nlmsg_type_to_str(uint32_t msg_type) static const char *nlmsg_type_to_str(uint32_t msg_type)
{ {
const char *str = NULL; const char *str = NULL;
@ -2232,11 +2460,20 @@ static void print_nlmsg(const struct timeval *tv, const struct nlmsghdr *nlmsg)
static void print_rtnl_msg(const struct timeval *tv, static void print_rtnl_msg(const struct timeval *tv,
const struct nlmsghdr *nlmsg) const struct nlmsghdr *nlmsg)
{ {
struct ifinfomsg *info;
int len;
switch (nlmsg->nlmsg_type) { switch (nlmsg->nlmsg_type) {
case RTM_NEWLINK: case RTM_NEWLINK:
case RTM_DELLINK: case RTM_DELLINK:
case RTM_SETLINK: case RTM_SETLINK:
case RTM_GETLINK: case RTM_GETLINK:
info = (struct ifinfomsg *) NLMSG_DATA(nlmsg);
len = IFLA_PAYLOAD(nlmsg);
print_nlmsghdr(tv, nlmsg);
print_rtm_link(nlmsg->nlmsg_type, info, len);
break;
case RTM_NEWADDR: case RTM_NEWADDR:
case RTM_DELADDR: case RTM_DELADDR:
case RTM_GETADDR: case RTM_GETADDR: