Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *	Spanning tree protocol; interface code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *	Linux ethernet bridge
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *	Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *	Lennert Buytenhek		<buytenh@gnu.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kmod.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/etherdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/switchdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include "br_private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include "br_private_stp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) /* Port id is composed of priority and port number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * NB: some bits of priority are dropped to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  *     make room for more ports.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	return ((u16)priority << BR_PORT_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 		| (port_no & ((1<<BR_PORT_BITS)-1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) void br_init_port(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	p->port_id = br_make_port_id(p->priority, p->port_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	br_become_designated_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	br_set_state(p, BR_STATE_BLOCKING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	p->topology_change_ack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	p->config_pending = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	err = __set_ageing_time(p->dev, p->br->ageing_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		netdev_err(p->dev, "failed to offload ageing time\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) /* NO locks held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) void br_stp_enable_bridge(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	if (br->stp_enabled == BR_KERNEL_STP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		mod_timer(&br->hello_timer, jiffies + br->hello_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	mod_delayed_work(system_long_wq, &br->gc_work, HZ / 10);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	br_config_bpdu_generation(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		if (netif_running(p->dev) && netif_oper_up(p->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 			br_stp_enable_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) /* NO locks held */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) void br_stp_disable_bridge(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 		if (p->state != BR_STATE_DISABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 			br_stp_disable_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	__br_set_topology_change(br, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	br->topology_change_detected = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	del_timer_sync(&br->hello_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	del_timer_sync(&br->topology_change_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	del_timer_sync(&br->tcn_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	cancel_delayed_work_sync(&br->gc_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) void br_stp_enable_port(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	br_init_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	br_port_state_selection(p->br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) void br_stp_disable_port(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	struct net_bridge *br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	int wasroot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	wasroot = br_is_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	br_become_designated_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	br_set_state(p, BR_STATE_DISABLED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	p->topology_change_ack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	p->config_pending = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	del_timer(&p->message_age_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	del_timer(&p->forward_delay_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	del_timer(&p->hold_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	if (!rcu_access_pointer(p->backup_port))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		br_fdb_delete_by_port(br, p, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	br_multicast_disable_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	br_configuration_update(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	br_port_state_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (br_is_root_bridge(br) && !wasroot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		br_become_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static int br_stp_call_user(struct net_bridge *br, char *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	char *argv[] = { BR_STP_PROG, br->dev->name, arg, NULL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	char *envp[] = { NULL };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	/* call userspace STP and report program errors */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	rc = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	if (rc > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 		if (rc & 0xff)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 			br_debug(br, BR_STP_PROG " received signal %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 				 rc & 0x7f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			br_debug(br, BR_STP_PROG " exited with code %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 				 (rc >> 8) & 0xff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) static void br_stp_start(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	int err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	if (net_eq(dev_net(br->dev), &init_net))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 		err = br_stp_call_user(br, "start");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	if (err && err != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		br_err(br, "failed to start userspace STP (%d)\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		__br_set_forward_delay(br, BR_MIN_FORWARD_DELAY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		__br_set_forward_delay(br, BR_MAX_FORWARD_DELAY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		br->stp_enabled = BR_USER_STP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		br_debug(br, "userspace STP started\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		br->stp_enabled = BR_KERNEL_STP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		br_debug(br, "using kernel STP\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		/* To start timers on any ports left in blocking */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		if (br->dev->flags & IFF_UP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 			mod_timer(&br->hello_timer, jiffies + br->hello_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		br_port_state_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static void br_stp_stop(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (br->stp_enabled == BR_USER_STP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		err = br_stp_call_user(br, "stop");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			br_err(br, "failed to stop userspace STP (%d)\n", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		/* To start timers on any ports left in blocking */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		br_port_state_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	br->stp_enabled = BR_NO_STP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		       struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	ASSERT_RTNL();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	if (br_mrp_enabled(br)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		NL_SET_ERR_MSG_MOD(extack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 				   "STP can't be enabled if MRP is already enabled");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	if (val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 		if (br->stp_enabled == BR_NO_STP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 			br_stp_start(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		if (br->stp_enabled != BR_NO_STP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 			br_stp_stop(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	/* should be aligned on 2 bytes for ether_addr_equal() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	unsigned short oldaddr_aligned[ETH_ALEN >> 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	unsigned char *oldaddr = (unsigned char *)oldaddr_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	int wasroot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	wasroot = br_is_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	br_fdb_change_mac_address(br, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	memcpy(br->bridge_id.addr, addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	memcpy(br->dev->dev_addr, addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		if (ether_addr_equal(p->designated_bridge.addr, oldaddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		if (ether_addr_equal(p->designated_root.addr, oldaddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			memcpy(p->designated_root.addr, addr, ETH_ALEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	br_configuration_update(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	br_port_state_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	if (br_is_root_bridge(br) && !wasroot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		br_become_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /* should be aligned on 2 bytes for ether_addr_equal() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) bool br_stp_recalculate_bridge_id(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	const unsigned char *br_mac_zero =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			(const unsigned char *)br_mac_zero_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	const unsigned char *addr = br_mac_zero;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	/* user has chosen a value so keep it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	if (br->dev->addr_assign_type == NET_ADDR_SET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		if (addr == br_mac_zero ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 		    memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 			addr = p->dev->dev_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (ether_addr_equal(br->bridge_id.addr, addr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		return false;	/* no change */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	br_stp_change_bridge_id(br, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) /* Acquires and releases bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	int wasroot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	wasroot = br_is_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 		if (p->state != BR_STATE_DISABLED &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		    br_is_designated_port(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			p->designated_bridge.prio[1] = newprio & 0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	br->bridge_id.prio[1] = newprio & 0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	br_configuration_update(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	br_port_state_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (br_is_root_bridge(br) && !wasroot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 		br_become_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	port_id new_port_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	if (newprio > BR_MAX_PORT_PRIORITY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 		return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 	new_port_id = br_make_port_id(newprio, p->port_no);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	if (br_is_designated_port(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		p->designated_port = new_port_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	p->port_id = new_port_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	p->priority = newprio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	    p->port_id < p->designated_port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 		br_become_designated_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 		br_port_state_selection(p->br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	if (path_cost < BR_MIN_PATH_COST ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	    path_cost > BR_MAX_PATH_COST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	p->flags |= BR_ADMIN_COST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 	p->path_cost = path_cost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	br_configuration_update(p->br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	br_port_state_selection(p->br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	       id->prio[0], id->prio[1],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	       id->addr[0], id->addr[1], id->addr[2],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 	       id->addr[3], id->addr[4], id->addr[5]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }