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iproute2/bridge/fdb.c
Serhey Popovych 7a14358b16 iplink: Use ll_name_to_index() instead of if_nametoindex() 
While benefit from using ll_name_to_index() with populated
cache can potentially be exploited only in few places
(e.g. bridge fdb/mdb/vlan show routines) there is another
advantage of ll_name_to_index() over plain if_nametoindex():

  in case of if_nametoindex() failure ll_name_to_index()
  will attempt to get index from common name in form "if%d"
  that may be returned from ll_index_to_name().

This makes output from ip(8) coherent with it's input.

Note that most of the code already switched from plain
if_nametoindex() to ll_name_to_index() to cached variant.

Signed-off-by: Serhey Popovych <serhe.popovych@gmail.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
2018-01-23 14:50:59 -08:00

579 lines
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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Get/set/delete fdb table with netlink
*
* TODO: merge/replace this with ip neighbour
*
* Authors: Stephen Hemminger <shemminger@vyatta.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <time.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <net/if.h>
#include <netinet/in.h>
#include <linux/if_bridge.h>
#include <linux/if_ether.h>
#include <linux/neighbour.h>
#include <string.h>
#include <limits.h>
#include <json_writer.h>
#include <stdbool.h>
#include "libnetlink.h"
#include "br_common.h"
#include "rt_names.h"
#include "utils.h"
static unsigned int filter_index, filter_vlan, filter_state;
json_writer_t *jw_global;
static void usage(void)
{
fprintf(stderr,
"Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"
" [ self ] [ master ] [ use ] [ router ]\n"
" [ local | static | dynamic ] [ dst IPADDR ] [ vlan VID ]\n"
" [ port PORT] [ vni VNI ] [ via DEV ]\n"
" bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ] [ state STATE ] ]\n");
exit(-1);
}
static const char *state_n2a(unsigned int s)
{
static char buf[32];
if (s & NUD_PERMANENT)
return "permanent";
if (s & NUD_NOARP)
return "static";
if (s & NUD_STALE)
return "stale";
if (s & NUD_REACHABLE)
return "";
sprintf(buf, "state=%#x", s);
return buf;
}
static int state_a2n(unsigned int *s, const char *arg)
{
if (matches(arg, "permanent") == 0)
*s = NUD_PERMANENT;
else if (matches(arg, "static") == 0 || matches(arg, "temp") == 0)
*s = NUD_NOARP;
else if (matches(arg, "stale") == 0)
*s = NUD_STALE;
else if (matches(arg, "reachable") == 0 || matches(arg, "dynamic") == 0)
*s = NUD_REACHABLE;
else if (strcmp(arg, "all") == 0)
*s = ~0;
else if (get_unsigned(s, arg, 0))
return -1;
return 0;
}
static void start_json_fdb_flags_array(bool *fdb_flags)
{
if (*fdb_flags)
return;
jsonw_name(jw_global, "flags");
jsonw_start_array(jw_global);
*fdb_flags = true;
}
int print_fdb(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
{
FILE *fp = arg;
struct ndmsg *r = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[NDA_MAX+1];
__u16 vid = 0;
bool fdb_flags = false;
const char *state_s;
if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return 0;
}
len -= NLMSG_LENGTH(sizeof(*r));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (r->ndm_family != AF_BRIDGE)
return 0;
if (filter_index && filter_index != r->ndm_ifindex)
return 0;
if (filter_state && !(r->ndm_state & filter_state))
return 0;
parse_rtattr(tb, NDA_MAX, NDA_RTA(r),
n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
if (tb[NDA_VLAN])
vid = rta_getattr_u16(tb[NDA_VLAN]);
if (filter_vlan && filter_vlan != vid)
return 0;
if (jw_global) {
jsonw_pretty(jw_global, 1);
jsonw_start_object(jw_global);
}
if (n->nlmsg_type == RTM_DELNEIGH) {
if (jw_global)
jsonw_string_field(jw_global, "opCode", "deleted");
else
fprintf(fp, "Deleted ");
}
if (tb[NDA_LLADDR]) {
SPRINT_BUF(b1);
ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
RTA_PAYLOAD(tb[NDA_LLADDR]),
ll_index_to_type(r->ndm_ifindex),
b1, sizeof(b1));
if (jw_global)
jsonw_string_field(jw_global, "mac", b1);
else
fprintf(fp, "%s ", b1);
}
if (!filter_index && r->ndm_ifindex) {
if (jw_global)
jsonw_string_field(jw_global, "dev",
ll_index_to_name(r->ndm_ifindex));
else
fprintf(fp, "dev %s ",
ll_index_to_name(r->ndm_ifindex));
}
if (tb[NDA_DST]) {
int family = AF_INET;
const char *abuf_s;
if (RTA_PAYLOAD(tb[NDA_DST]) == sizeof(struct in6_addr))
family = AF_INET6;
abuf_s = format_host(family,
RTA_PAYLOAD(tb[NDA_DST]),
RTA_DATA(tb[NDA_DST]));
if (jw_global)
jsonw_string_field(jw_global, "dst", abuf_s);
else
fprintf(fp, "dst %s ", abuf_s);
}
if (vid) {
if (jw_global)
jsonw_uint_field(jw_global, "vlan", vid);
else
fprintf(fp, "vlan %hu ", vid);
}
if (tb[NDA_PORT]) {
if (jw_global)
jsonw_uint_field(jw_global, "port",
rta_getattr_be16(tb[NDA_PORT]));
else
fprintf(fp, "port %d ",
rta_getattr_be16(tb[NDA_PORT]));
}
if (tb[NDA_VNI]) {
if (jw_global)
jsonw_uint_field(jw_global, "vni",
rta_getattr_u32(tb[NDA_VNI]));
else
fprintf(fp, "vni %d ",
rta_getattr_u32(tb[NDA_VNI]));
}
if (tb[NDA_SRC_VNI]) {
if (jw_global)
jsonw_uint_field(jw_global, "src_vni",
rta_getattr_u32(tb[NDA_SRC_VNI]));
else
fprintf(fp, "src_vni %d ",
rta_getattr_u32(tb[NDA_SRC_VNI]));
}
if (tb[NDA_IFINDEX]) {
unsigned int ifindex = rta_getattr_u32(tb[NDA_IFINDEX]);
if (ifindex) {
if (!tb[NDA_LINK_NETNSID]) {
const char *ifname = ll_index_to_name(ifindex);
if (jw_global)
jsonw_string_field(jw_global, "viaIf",
ifname);
else
fprintf(fp, "via %s ", ifname);
} else {
if (jw_global)
jsonw_uint_field(jw_global, "viaIfIndex",
ifindex);
else
fprintf(fp, "via ifindex %u ", ifindex);
}
}
}
if (tb[NDA_LINK_NETNSID]) {
if (jw_global)
jsonw_uint_field(jw_global, "linkNetNsId",
rta_getattr_u32(tb[NDA_LINK_NETNSID]));
else
fprintf(fp, "link-netnsid %d ",
rta_getattr_u32(tb[NDA_LINK_NETNSID]));
}
if (show_stats && tb[NDA_CACHEINFO]) {
struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
int hz = get_user_hz();
if (jw_global) {
jsonw_uint_field(jw_global, "used",
ci->ndm_used/hz);
jsonw_uint_field(jw_global, "updated",
ci->ndm_updated/hz);
} else {
fprintf(fp, "used %d/%d ", ci->ndm_used/hz,
ci->ndm_updated/hz);
}
}
if (jw_global) {
if (r->ndm_flags & NTF_SELF) {
start_json_fdb_flags_array(&fdb_flags);
jsonw_string(jw_global, "self");
}
if (r->ndm_flags & NTF_ROUTER) {
start_json_fdb_flags_array(&fdb_flags);
jsonw_string(jw_global, "router");
}
if (r->ndm_flags & NTF_EXT_LEARNED) {
start_json_fdb_flags_array(&fdb_flags);
jsonw_string(jw_global, "extern_learn");
}
if (r->ndm_flags & NTF_OFFLOADED) {
start_json_fdb_flags_array(&fdb_flags);
jsonw_string(jw_global, "offload");
}
if (r->ndm_flags & NTF_MASTER)
jsonw_string(jw_global, "master");
if (fdb_flags)
jsonw_end_array(jw_global);
if (tb[NDA_MASTER])
jsonw_string_field(jw_global,
"master",
ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));
} else {
if (r->ndm_flags & NTF_SELF)
fprintf(fp, "self ");
if (r->ndm_flags & NTF_ROUTER)
fprintf(fp, "router ");
if (r->ndm_flags & NTF_EXT_LEARNED)
fprintf(fp, "extern_learn ");
if (r->ndm_flags & NTF_OFFLOADED)
fprintf(fp, "offload ");
if (tb[NDA_MASTER]) {
fprintf(fp, "master %s ",
ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));
} else if (r->ndm_flags & NTF_MASTER) {
fprintf(fp, "master ");
}
}
state_s = state_n2a(r->ndm_state);
if (jw_global) {
if (state_s[0])
jsonw_string_field(jw_global, "state", state_s);
jsonw_end_object(jw_global);
} else {
fprintf(fp, "%s\n", state_s);
fflush(fp);
}
return 0;
}
static int fdb_show(int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct ifinfomsg ifm;
char buf[256];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
.ifm.ifi_family = PF_BRIDGE,
};
char *filter_dev = NULL;
char *br = NULL;
int msg_size = sizeof(struct ifinfomsg);
while (argc > 0) {
if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {
NEXT_ARG();
filter_dev = *argv;
} else if (strcmp(*argv, "br") == 0) {
NEXT_ARG();
br = *argv;
} else if (strcmp(*argv, "vlan") == 0) {
NEXT_ARG();
if (filter_vlan)
duparg("vlan", *argv);
filter_vlan = atoi(*argv);
} else if (strcmp(*argv, "state") == 0) {
unsigned int state;
NEXT_ARG();
if (state_a2n(&state, *argv))
invarg("invalid state", *argv);
filter_state |= state;
} else {
if (matches(*argv, "help") == 0)
usage();
}
argc--; argv++;
}
if (br) {
int br_ifindex = ll_name_to_index(br);
if (br_ifindex == 0) {
fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);
return -1;
}
addattr32(&req.n, sizeof(req), IFLA_MASTER, br_ifindex);
msg_size += RTA_LENGTH(4);
}
/*we'll keep around filter_dev for older kernels */
if (filter_dev) {
filter_index = ll_name_to_index(filter_dev);
if (filter_index == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n",
filter_dev);
return -1;
}
req.ifm.ifi_index = filter_index;
}
if (rtnl_dump_request(&rth, RTM_GETNEIGH, &req.ifm, msg_size) < 0) {
perror("Cannot send dump request");
exit(1);
}
if (json_output) {
jw_global = jsonw_new(stdout);
if (!jw_global) {
fprintf(stderr, "Error allocation json object\n");
exit(1);
}
jsonw_start_array(jw_global);
}
if (rtnl_dump_filter(&rth, print_fdb, stdout) < 0) {
fprintf(stderr, "Dump terminated\n");
exit(1);
}
if (jw_global) {
jsonw_end_array(jw_global);
jsonw_destroy(&jw_global);
}
return 0;
}
static int fdb_modify(int cmd, int flags, int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
.n.nlmsg_flags = NLM_F_REQUEST | flags,
.n.nlmsg_type = cmd,
.ndm.ndm_family = PF_BRIDGE,
.ndm.ndm_state = NUD_NOARP,
};
char *addr = NULL;
char *d = NULL;
char abuf[ETH_ALEN];
int dst_ok = 0;
inet_prefix dst;
unsigned long port = 0;
unsigned long vni = ~0;
unsigned int via = 0;
char *endptr;
short vid = -1;
while (argc > 0) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
d = *argv;
} else if (strcmp(*argv, "dst") == 0) {
NEXT_ARG();
if (dst_ok)
duparg2("dst", *argv);
get_addr(&dst, *argv, preferred_family);
dst_ok = 1;
} else if (strcmp(*argv, "port") == 0) {
NEXT_ARG();
port = strtoul(*argv, &endptr, 0);
if (endptr && *endptr) {
struct servent *pse;
pse = getservbyname(*argv, "udp");
if (!pse)
invarg("invalid port\n", *argv);
port = ntohs(pse->s_port);
} else if (port > 0xffff)
invarg("invalid port\n", *argv);
} else if (strcmp(*argv, "vni") == 0) {
NEXT_ARG();
vni = strtoul(*argv, &endptr, 0);
if ((endptr && *endptr) ||
(vni >> 24) || vni == ULONG_MAX)
invarg("invalid VNI\n", *argv);
} else if (strcmp(*argv, "via") == 0) {
NEXT_ARG();
via = ll_name_to_index(*argv);
if (via == 0)
invarg("invalid device\n", *argv);
} else if (strcmp(*argv, "self") == 0) {
req.ndm.ndm_flags |= NTF_SELF;
} else if (matches(*argv, "master") == 0) {
req.ndm.ndm_flags |= NTF_MASTER;
} else if (matches(*argv, "router") == 0) {
req.ndm.ndm_flags |= NTF_ROUTER;
} else if (matches(*argv, "local") == 0 ||
matches(*argv, "permanent") == 0) {
req.ndm.ndm_state |= NUD_PERMANENT;
} else if (matches(*argv, "temp") == 0 ||
matches(*argv, "static") == 0) {
req.ndm.ndm_state |= NUD_REACHABLE;
} else if (matches(*argv, "dynamic") == 0) {
req.ndm.ndm_state |= NUD_REACHABLE;
req.ndm.ndm_state &= ~NUD_NOARP;
} else if (matches(*argv, "vlan") == 0) {
if (vid >= 0)
duparg2("vlan", *argv);
NEXT_ARG();
vid = atoi(*argv);
} else if (matches(*argv, "use") == 0) {
req.ndm.ndm_flags |= NTF_USE;
} else {
if (strcmp(*argv, "to") == 0)
NEXT_ARG();
if (matches(*argv, "help") == 0)
usage();
if (addr)
duparg2("to", *argv);
addr = *argv;
}
argc--; argv++;
}
if (d == NULL || addr == NULL) {
fprintf(stderr, "Device and address are required arguments.\n");
return -1;
}
/* Assume self */
if (!(req.ndm.ndm_flags&(NTF_SELF|NTF_MASTER)))
req.ndm.ndm_flags |= NTF_SELF;
/* Assume permanent */
if (!(req.ndm.ndm_state&(NUD_PERMANENT|NUD_REACHABLE)))
req.ndm.ndm_state |= NUD_PERMANENT;
if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
abuf, abuf+1, abuf+2,
abuf+3, abuf+4, abuf+5) != 6) {
fprintf(stderr, "Invalid mac address %s\n", addr);
return -1;
}
addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);
if (dst_ok)
addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen);
if (vid >= 0)
addattr16(&req.n, sizeof(req), NDA_VLAN, vid);
if (port) {
unsigned short dport;
dport = htons((unsigned short)port);
addattr16(&req.n, sizeof(req), NDA_PORT, dport);
}
if (vni != ~0)
addattr32(&req.n, sizeof(req), NDA_VNI, vni);
if (via)
addattr32(&req.n, sizeof(req), NDA_IFINDEX, via);
req.ndm.ndm_ifindex = ll_name_to_index(d);
if (req.ndm.ndm_ifindex == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", d);
return -1;
}
if (rtnl_talk(&rth, &req.n, NULL) < 0)
return -1;
return 0;
}
int do_fdb(int argc, char **argv)
{
ll_init_map(&rth);
if (argc > 0) {
if (matches(*argv, "add") == 0)
return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
if (matches(*argv, "append") == 0)
return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_APPEND, argc-1, argv+1);
if (matches(*argv, "replace") == 0)
return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return fdb_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
if (matches(*argv, "show") == 0 ||
matches(*argv, "lst") == 0 ||
matches(*argv, "list") == 0)
return fdb_show(argc-1, argv+1);
if (matches(*argv, "help") == 0)
usage();
} else
return fdb_show(0, NULL);
fprintf(stderr, "Command \"%s\" is unknown, try \"bridge fdb help\".\n", *argv);
exit(-1);
}
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