2 * swlib.c: Switch configuration API (user space part)
4 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * version 2.1 as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <linux/switch.h>
27 #include <netlink/netlink.h>
28 #include <netlink/genl/genl.h>
29 #include <netlink/genl/family.h>
33 #define DPRINTF(fmt, ...) fprintf(stderr, "%s(%d): " fmt, __func__, __LINE__, ##__VA_ARGS__)
35 #define DPRINTF(fmt, ...) do {} while (0)
38 static struct nl_sock
*handle
;
39 static struct nl_cache
*cache
;
40 static struct genl_family
*family
;
41 static struct nlattr
*tb
[SWITCH_ATTR_MAX
+ 1];
42 static int refcount
= 0;
44 static struct nla_policy port_policy
[SWITCH_ATTR_MAX
] = {
45 [SWITCH_PORT_ID
] = { .type
= NLA_U32
},
46 [SWITCH_PORT_FLAG_TAGGED
] = { .type
= NLA_FLAG
},
49 static struct nla_policy portmap_policy
[SWITCH_PORTMAP_MAX
] = {
50 [SWITCH_PORTMAP_SEGMENT
] = { .type
= NLA_STRING
},
51 [SWITCH_PORTMAP_VIRT
] = { .type
= NLA_U32
},
55 swlib_alloc(size_t size
)
69 wait_handler(struct nl_msg
*msg
, void *arg
)
77 /* helper function for performing netlink requests */
79 swlib_call(int cmd
, int (*call
)(struct nl_msg
*, void *),
80 int (*data
)(struct nl_msg
*, void *), void *arg
)
83 struct nl_cb
*cb
= NULL
;
90 fprintf(stderr
, "Out of memory!\n");
97 genlmsg_put(msg
, NL_AUTO_PID
, NL_AUTO_SEQ
, genl_family_get_id(family
), 0, flags
, cmd
, 0);
99 if (data(msg
, arg
) < 0)
100 goto nla_put_failure
;
103 cb
= nl_cb_alloc(NL_CB_CUSTOM
);
105 fprintf(stderr
, "nl_cb_alloc failed.\n");
109 err
= nl_send_auto_complete(handle
, msg
);
111 fprintf(stderr
, "nl_send_auto_complete failed: %d\n", err
);
118 nl_cb_set(cb
, NL_CB_VALID
, NL_CB_CUSTOM
, call
, arg
);
121 nl_cb_set(cb
, NL_CB_ACK
, NL_CB_CUSTOM
, wait_handler
, &finished
);
123 nl_cb_set(cb
, NL_CB_FINISH
, NL_CB_CUSTOM
, wait_handler
, &finished
);
125 err
= nl_recvmsgs(handle
, cb
);
131 err
= nl_wait_for_ack(handle
);
142 send_attr(struct nl_msg
*msg
, void *arg
)
144 struct switch_val
*val
= arg
;
145 struct switch_attr
*attr
= val
->attr
;
147 NLA_PUT_U32(msg
, SWITCH_ATTR_ID
, attr
->dev
->id
);
148 NLA_PUT_U32(msg
, SWITCH_ATTR_OP_ID
, attr
->id
);
149 switch(attr
->atype
) {
150 case SWLIB_ATTR_GROUP_PORT
:
151 NLA_PUT_U32(msg
, SWITCH_ATTR_OP_PORT
, val
->port_vlan
);
153 case SWLIB_ATTR_GROUP_VLAN
:
154 NLA_PUT_U32(msg
, SWITCH_ATTR_OP_VLAN
, val
->port_vlan
);
167 store_port_val(struct nl_msg
*msg
, struct nlattr
*nla
, struct switch_val
*val
)
170 int ports
= val
->attr
->dev
->ports
;
174 if (!val
->value
.ports
)
175 val
->value
.ports
= malloc(sizeof(struct switch_port
) * ports
);
177 nla_for_each_nested(p
, nla
, remaining
) {
178 struct nlattr
*tb
[SWITCH_PORT_ATTR_MAX
+1];
179 struct switch_port
*port
;
181 if (val
->len
>= ports
)
184 err
= nla_parse_nested(tb
, SWITCH_PORT_ATTR_MAX
, p
, port_policy
);
188 if (!tb
[SWITCH_PORT_ID
])
191 port
= &val
->value
.ports
[val
->len
];
192 port
->id
= nla_get_u32(tb
[SWITCH_PORT_ID
]);
194 if (tb
[SWITCH_PORT_FLAG_TAGGED
])
195 port
->flags
|= SWLIB_PORT_FLAG_TAGGED
;
205 store_val(struct nl_msg
*msg
, void *arg
)
207 struct genlmsghdr
*gnlh
= nlmsg_data(nlmsg_hdr(msg
));
208 struct switch_val
*val
= arg
;
213 if (nla_parse(tb
, SWITCH_ATTR_MAX
- 1, genlmsg_attrdata(gnlh
, 0),
214 genlmsg_attrlen(gnlh
, 0), NULL
) < 0) {
218 if (tb
[SWITCH_ATTR_OP_VALUE_INT
])
219 val
->value
.i
= nla_get_u32(tb
[SWITCH_ATTR_OP_VALUE_INT
]);
220 else if (tb
[SWITCH_ATTR_OP_VALUE_STR
])
221 val
->value
.s
= strdup(nla_get_string(tb
[SWITCH_ATTR_OP_VALUE_STR
]));
222 else if (tb
[SWITCH_ATTR_OP_VALUE_PORTS
])
223 val
->err
= store_port_val(msg
, tb
[SWITCH_ATTR_OP_VALUE_PORTS
], val
);
233 swlib_get_attr(struct switch_dev
*dev
, struct switch_attr
*attr
, struct switch_val
*val
)
238 switch(attr
->atype
) {
239 case SWLIB_ATTR_GROUP_GLOBAL
:
240 cmd
= SWITCH_CMD_GET_GLOBAL
;
242 case SWLIB_ATTR_GROUP_PORT
:
243 cmd
= SWITCH_CMD_GET_PORT
;
245 case SWLIB_ATTR_GROUP_VLAN
:
246 cmd
= SWITCH_CMD_GET_VLAN
;
252 memset(&val
->value
, 0, sizeof(val
->value
));
256 err
= swlib_call(cmd
, store_val
, send_attr
, val
);
264 send_attr_ports(struct nl_msg
*msg
, struct switch_val
*val
)
269 /* TODO implement multipart? */
272 n
= nla_nest_start(msg
, SWITCH_ATTR_OP_VALUE_PORTS
);
274 goto nla_put_failure
;
275 for (i
= 0; i
< val
->len
; i
++) {
276 struct switch_port
*port
= &val
->value
.ports
[i
];
279 np
= nla_nest_start(msg
, SWITCH_ATTR_PORT
);
281 goto nla_put_failure
;
283 NLA_PUT_U32(msg
, SWITCH_PORT_ID
, port
->id
);
284 if (port
->flags
& SWLIB_PORT_FLAG_TAGGED
)
285 NLA_PUT_FLAG(msg
, SWITCH_PORT_FLAG_TAGGED
);
287 nla_nest_end(msg
, np
);
289 nla_nest_end(msg
, n
);
298 send_attr_val(struct nl_msg
*msg
, void *arg
)
300 struct switch_val
*val
= arg
;
301 struct switch_attr
*attr
= val
->attr
;
303 if (send_attr(msg
, arg
))
304 goto nla_put_failure
;
307 case SWITCH_TYPE_NOVAL
:
309 case SWITCH_TYPE_INT
:
310 NLA_PUT_U32(msg
, SWITCH_ATTR_OP_VALUE_INT
, val
->value
.i
);
312 case SWITCH_TYPE_STRING
:
314 goto nla_put_failure
;
315 NLA_PUT_STRING(msg
, SWITCH_ATTR_OP_VALUE_STR
, val
->value
.s
);
317 case SWITCH_TYPE_PORTS
:
318 if (send_attr_ports(msg
, val
) < 0)
319 goto nla_put_failure
;
322 goto nla_put_failure
;
331 swlib_set_attr(struct switch_dev
*dev
, struct switch_attr
*attr
, struct switch_val
*val
)
335 switch(attr
->atype
) {
336 case SWLIB_ATTR_GROUP_GLOBAL
:
337 cmd
= SWITCH_CMD_SET_GLOBAL
;
339 case SWLIB_ATTR_GROUP_PORT
:
340 cmd
= SWITCH_CMD_SET_PORT
;
342 case SWLIB_ATTR_GROUP_VLAN
:
343 cmd
= SWITCH_CMD_SET_VLAN
;
350 return swlib_call(cmd
, NULL
, send_attr_val
, val
);
353 int swlib_set_attr_string(struct switch_dev
*dev
, struct switch_attr
*a
, int port_vlan
, const char *str
)
355 struct switch_port
*ports
;
356 struct switch_val val
;
359 memset(&val
, 0, sizeof(val
));
360 val
.port_vlan
= port_vlan
;
362 case SWITCH_TYPE_INT
:
363 val
.value
.i
= atoi(str
);
365 case SWITCH_TYPE_STRING
:
366 val
.value
.s
= (char *)str
;
368 case SWITCH_TYPE_PORTS
:
369 ports
= alloca(sizeof(struct switch_port
) * dev
->ports
);
370 memset(ports
, 0, sizeof(struct switch_port
) * dev
->ports
);
375 while(*ptr
&& isspace(*ptr
))
384 if (val
.len
>= dev
->ports
)
387 ports
[val
.len
].flags
= 0;
388 ports
[val
.len
].id
= strtoul(ptr
, &ptr
, 10);
389 while(*ptr
&& !isspace(*ptr
)) {
391 ports
[val
.len
].flags
|= SWLIB_PORT_FLAG_TAGGED
;
401 val
.value
.ports
= ports
;
403 case SWITCH_TYPE_NOVAL
:
404 if (str
&& !strcmp(str
, "0"))
411 return swlib_set_attr(dev
, a
, &val
);
415 struct attrlist_arg
{
418 struct switch_dev
*dev
;
419 struct switch_attr
*prev
;
420 struct switch_attr
**head
;
424 add_id(struct nl_msg
*msg
, void *arg
)
426 struct attrlist_arg
*l
= arg
;
428 NLA_PUT_U32(msg
, SWITCH_ATTR_ID
, l
->id
);
436 add_attr(struct nl_msg
*msg
, void *ptr
)
438 struct genlmsghdr
*gnlh
= nlmsg_data(nlmsg_hdr(msg
));
439 struct attrlist_arg
*arg
= ptr
;
440 struct switch_attr
*new;
442 if (nla_parse(tb
, SWITCH_ATTR_MAX
- 1, genlmsg_attrdata(gnlh
, 0),
443 genlmsg_attrlen(gnlh
, 0), NULL
) < 0)
446 new = swlib_alloc(sizeof(struct switch_attr
));
451 new->atype
= arg
->atype
;
453 arg
->prev
->next
= new;
455 arg
->prev
= *arg
->head
;
458 arg
->head
= &new->next
;
460 if (tb
[SWITCH_ATTR_OP_ID
])
461 new->id
= nla_get_u32(tb
[SWITCH_ATTR_OP_ID
]);
462 if (tb
[SWITCH_ATTR_OP_TYPE
])
463 new->type
= nla_get_u32(tb
[SWITCH_ATTR_OP_TYPE
]);
464 if (tb
[SWITCH_ATTR_OP_NAME
])
465 new->name
= strdup(nla_get_string(tb
[SWITCH_ATTR_OP_NAME
]));
466 if (tb
[SWITCH_ATTR_OP_DESCRIPTION
])
467 new->description
= strdup(nla_get_string(tb
[SWITCH_ATTR_OP_DESCRIPTION
]));
474 swlib_scan(struct switch_dev
*dev
)
476 struct attrlist_arg arg
;
478 if (dev
->ops
|| dev
->port_ops
|| dev
->vlan_ops
)
481 arg
.atype
= SWLIB_ATTR_GROUP_GLOBAL
;
485 arg
.head
= &dev
->ops
;
486 swlib_call(SWITCH_CMD_LIST_GLOBAL
, add_attr
, add_id
, &arg
);
488 arg
.atype
= SWLIB_ATTR_GROUP_PORT
;
490 arg
.head
= &dev
->port_ops
;
491 swlib_call(SWITCH_CMD_LIST_PORT
, add_attr
, add_id
, &arg
);
493 arg
.atype
= SWLIB_ATTR_GROUP_VLAN
;
495 arg
.head
= &dev
->vlan_ops
;
496 swlib_call(SWITCH_CMD_LIST_VLAN
, add_attr
, add_id
, &arg
);
501 struct switch_attr
*swlib_lookup_attr(struct switch_dev
*dev
,
502 enum swlib_attr_group atype
, const char *name
)
504 struct switch_attr
*head
;
510 case SWLIB_ATTR_GROUP_GLOBAL
:
513 case SWLIB_ATTR_GROUP_PORT
:
514 head
= dev
->port_ops
;
516 case SWLIB_ATTR_GROUP_VLAN
:
517 head
= dev
->vlan_ops
;
521 if (!strcmp(name
, head
->name
))
530 swlib_priv_free(void)
533 nl_object_put((struct nl_object
*)family
);
535 nl_cache_free(cache
);
537 nl_socket_free(handle
);
544 swlib_priv_init(void)
548 handle
= nl_socket_alloc();
550 DPRINTF("Failed to create handle\n");
554 if (genl_connect(handle
)) {
555 DPRINTF("Failed to connect to generic netlink\n");
559 ret
= genl_ctrl_alloc_cache(handle
, &cache
);
561 DPRINTF("Failed to allocate netlink cache\n");
565 family
= genl_ctrl_search_by_name(cache
, "switch");
567 DPRINTF("Switch API not present\n");
577 struct swlib_scan_arg
{
579 struct switch_dev
*head
;
580 struct switch_dev
*ptr
;
584 add_port_map(struct switch_dev
*dev
, struct nlattr
*nla
)
587 int err
= 0, idx
= 0;
590 dev
->maps
= malloc(sizeof(struct switch_portmap
) * dev
->ports
);
593 memset(dev
->maps
, 0, sizeof(struct switch_portmap
) * dev
->ports
);
595 nla_for_each_nested(p
, nla
, remaining
) {
596 struct nlattr
*tb
[SWITCH_PORTMAP_MAX
+1];
598 if (idx
>= dev
->ports
)
601 err
= nla_parse_nested(tb
, SWITCH_PORTMAP_MAX
, p
, portmap_policy
);
606 if (tb
[SWITCH_PORTMAP_SEGMENT
] && tb
[SWITCH_PORTMAP_VIRT
]) {
607 dev
->maps
[idx
].segment
= strdup(nla_get_string(tb
[SWITCH_PORTMAP_SEGMENT
]));
608 dev
->maps
[idx
].virt
= nla_get_u32(tb
[SWITCH_PORTMAP_VIRT
]);
619 add_switch(struct nl_msg
*msg
, void *arg
)
621 struct swlib_scan_arg
*sa
= arg
;
622 struct genlmsghdr
*gnlh
= nlmsg_data(nlmsg_hdr(msg
));
623 struct switch_dev
*dev
;
627 if (nla_parse(tb
, SWITCH_ATTR_MAX
, genlmsg_attrdata(gnlh
, 0), genlmsg_attrlen(gnlh
, 0), NULL
) < 0)
630 if (!tb
[SWITCH_ATTR_DEV_NAME
])
633 name
= nla_get_string(tb
[SWITCH_ATTR_DEV_NAME
]);
634 alias
= nla_get_string(tb
[SWITCH_ATTR_ALIAS
]);
636 if (sa
->name
&& (strcmp(name
, sa
->name
) != 0) && (strcmp(alias
, sa
->name
) != 0))
639 dev
= swlib_alloc(sizeof(struct switch_dev
));
643 strncpy(dev
->dev_name
, name
, IFNAMSIZ
- 1);
644 dev
->alias
= strdup(alias
);
645 if (tb
[SWITCH_ATTR_ID
])
646 dev
->id
= nla_get_u32(tb
[SWITCH_ATTR_ID
]);
647 if (tb
[SWITCH_ATTR_NAME
])
648 dev
->name
= strdup(nla_get_string(tb
[SWITCH_ATTR_NAME
]));
649 if (tb
[SWITCH_ATTR_PORTS
])
650 dev
->ports
= nla_get_u32(tb
[SWITCH_ATTR_PORTS
]);
651 if (tb
[SWITCH_ATTR_VLANS
])
652 dev
->vlans
= nla_get_u32(tb
[SWITCH_ATTR_VLANS
]);
653 if (tb
[SWITCH_ATTR_CPU_PORT
])
654 dev
->cpu_port
= nla_get_u32(tb
[SWITCH_ATTR_CPU_PORT
]);
655 if (tb
[SWITCH_ATTR_PORTMAP
])
656 add_port_map(dev
, tb
[SWITCH_ATTR_PORTMAP
]);
672 list_switch(struct nl_msg
*msg
, void *arg
)
674 struct genlmsghdr
*gnlh
= nlmsg_data(nlmsg_hdr(msg
));
676 if (nla_parse(tb
, SWITCH_ATTR_MAX
, genlmsg_attrdata(gnlh
, 0), genlmsg_attrlen(gnlh
, 0), NULL
) < 0)
679 if (!tb
[SWITCH_ATTR_DEV_NAME
] || !tb
[SWITCH_ATTR_NAME
])
682 printf("Found: %s - %s\n", nla_get_string(tb
[SWITCH_ATTR_DEV_NAME
]),
683 nla_get_string(tb
[SWITCH_ATTR_ALIAS
]));
692 if (swlib_priv_init() < 0)
694 swlib_call(SWITCH_CMD_GET_SWITCH
, list_switch
, NULL
, NULL
);
699 swlib_print_portmap(struct switch_dev
*dev
, char *segment
)
704 if (!strcmp(segment
, "cpu")) {
705 printf("%d ", dev
->cpu_port
);
706 } else if (!strcmp(segment
, "disabled")) {
707 for (i
= 0; i
< dev
->ports
; i
++)
708 if (!dev
->maps
[i
].segment
)
710 } else for (i
= 0; i
< dev
->ports
; i
++) {
711 if (dev
->maps
[i
].segment
&& !strcmp(dev
->maps
[i
].segment
, segment
))
715 printf("%s - %s\n", dev
->dev_name
, dev
->name
);
716 for (i
= 0; i
< dev
->ports
; i
++)
717 if (i
== dev
->cpu_port
)
718 printf("port%d:\tcpu\n", i
);
719 else if (dev
->maps
[i
].segment
)
720 printf("port%d:\t%s.%d\n", i
, dev
->maps
[i
].segment
, dev
->maps
[i
].virt
);
722 printf("port%d:\tdisabled\n", i
);
727 swlib_connect(const char *name
)
729 struct swlib_scan_arg arg
;
732 if (swlib_priv_init() < 0)
739 swlib_call(SWITCH_CMD_GET_SWITCH
, add_switch
, NULL
, &arg
);
748 swlib_free_attributes(struct switch_attr
**head
)
750 struct switch_attr
*a
= *head
;
751 struct switch_attr
*next
;
756 free(a
->description
);
764 swlib_free_port_map(struct switch_dev
*dev
)
768 if (!dev
|| !dev
->maps
)
771 for (i
= 0; i
< dev
->ports
; i
++)
772 free(dev
->maps
[i
].segment
);
777 swlib_free(struct switch_dev
*dev
)
779 swlib_free_attributes(&dev
->ops
);
780 swlib_free_attributes(&dev
->port_ops
);
781 swlib_free_attributes(&dev
->vlan_ops
);
782 swlib_free_port_map(dev
);
792 swlib_free_all(struct switch_dev
*dev
)
794 struct switch_dev
*p
;