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