^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; generic parts
^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) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <net/switchdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "br_private.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "br_private_stp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /* since time values in bpdu are in jiffies and then scaled (1/256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * before sending, make sure that is at least one STP tick.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define MESSAGE_AGE_INCR ((HZ / 256) + 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static const char *const br_port_state_names[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) [BR_STATE_DISABLED] = "disabled",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) [BR_STATE_LISTENING] = "listening",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) [BR_STATE_LEARNING] = "learning",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) [BR_STATE_FORWARDING] = "forwarding",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) [BR_STATE_BLOCKING] = "blocking",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) void br_set_state(struct net_bridge_port *p, unsigned int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct switchdev_attr attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) .orig_dev = p->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) .id = SWITCHDEV_ATTR_ID_PORT_STP_STATE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) .flags = SWITCHDEV_F_DEFER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) .u.stp_state = state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /* Don't change the state of the ports if they are driven by a different
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * protocol.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (p->flags & BR_MRP_AWARE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) p->state = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) err = switchdev_port_attr_set(p->dev, &attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (err && err != -EOPNOTSUPP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) br_warn(p->br, "error setting offload STP state on port %u(%s)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) (unsigned int) p->port_no, p->dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) br_info(p->br, "port %u(%s) entered %s state\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) (unsigned int) p->port_no, p->dev->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) br_port_state_names[p->state]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (p->br->stp_enabled == BR_KERNEL_STP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) switch (p->state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) case BR_STATE_BLOCKING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) p->stp_xstats.transition_blk++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) case BR_STATE_FORWARDING:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) p->stp_xstats.transition_fwd++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) break;
^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) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) list_for_each_entry_rcu(p, &br->port_list, list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) lockdep_is_held(&br->lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (p->port_no == port_no)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static int br_should_become_root_port(const struct net_bridge_port *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) u16 root_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct net_bridge *br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct net_bridge_port *rp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (p->state == BR_STATE_DISABLED ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) br_is_designated_port(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (!root_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) rp = br_get_port(br, root_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) t = memcmp(&p->designated_root, &rp->designated_root, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (t < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) else if (t > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (p->designated_cost + p->path_cost <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) rp->designated_cost + rp->path_cost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) else if (p->designated_cost + p->path_cost >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) rp->designated_cost + rp->path_cost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (t < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) else if (t > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (p->designated_port < rp->designated_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) else if (p->designated_port > rp->designated_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (p->port_id < rp->port_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static void br_root_port_block(const struct net_bridge *br,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) br_notice(br, "port %u(%s) tried to become root port (blocked)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) (unsigned int) p->port_no, p->dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) br_set_state(p, BR_STATE_LISTENING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) br_ifinfo_notify(RTM_NEWLINK, NULL, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) if (br->forward_delay > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static void br_root_selection(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) u16 root_port = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (!br_should_become_root_port(p, root_port))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (p->flags & BR_ROOT_BLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) br_root_port_block(br, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) root_port = p->port_no;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) br->root_port = root_port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) if (!root_port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) br->designated_root = br->bridge_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) br->root_path_cost = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) p = br_get_port(br, root_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) br->designated_root = p->designated_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) br->root_path_cost = p->designated_cost + p->path_cost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) void br_become_root_bridge(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) br->max_age = br->bridge_max_age;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) br->hello_time = br->bridge_hello_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) br->forward_delay = br->bridge_forward_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) br_topology_change_detection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) del_timer(&br->tcn_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (br->dev->flags & IFF_UP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) br_config_bpdu_generation(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) mod_timer(&br->hello_timer, jiffies + br->hello_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) void br_transmit_config(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct br_config_bpdu bpdu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct net_bridge *br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (timer_pending(&p->hold_timer)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) p->config_pending = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) bpdu.topology_change = br->topology_change;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) bpdu.topology_change_ack = p->topology_change_ack;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) bpdu.root = br->designated_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) bpdu.root_path_cost = br->root_path_cost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) bpdu.bridge_id = br->bridge_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) bpdu.port_id = p->port_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (br_is_root_bridge(br))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) bpdu.message_age = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) struct net_bridge_port *root
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) = br_get_port(br, br->root_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) bpdu.message_age = (jiffies - root->designated_age)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) + MESSAGE_AGE_INCR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) bpdu.max_age = br->max_age;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) bpdu.hello_time = br->hello_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) bpdu.forward_delay = br->forward_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) if (bpdu.message_age < br->max_age) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) br_send_config_bpdu(p, &bpdu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) p->topology_change_ack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) p->config_pending = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (p->br->stp_enabled == BR_KERNEL_STP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) mod_timer(&p->hold_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) round_jiffies(jiffies + BR_HOLD_TIME));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static void br_record_config_information(struct net_bridge_port *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) const struct br_config_bpdu *bpdu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) p->designated_root = bpdu->root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) p->designated_cost = bpdu->root_path_cost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) p->designated_bridge = bpdu->bridge_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) p->designated_port = bpdu->port_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) p->designated_age = jiffies - bpdu->message_age;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) mod_timer(&p->message_age_timer, jiffies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) + (bpdu->max_age - bpdu->message_age));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static void br_record_config_timeout_values(struct net_bridge *br,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) const struct br_config_bpdu *bpdu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) br->max_age = bpdu->max_age;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) br->hello_time = bpdu->hello_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) br->forward_delay = bpdu->forward_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) __br_set_topology_change(br, bpdu->topology_change);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) void br_transmit_tcn(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) p = br_get_port(br, br->root_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) br_send_tcn_bpdu(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) br_notice(br, "root port %u not found for topology notice\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) br->root_port);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static int br_should_become_designated_port(const struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct net_bridge *br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) int t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (br_is_designated_port(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (memcmp(&p->designated_root, &br->designated_root, 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) if (br->root_path_cost < p->designated_cost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) else if (br->root_path_cost > p->designated_cost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) t = memcmp(&br->bridge_id, &p->designated_bridge, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (t < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) else if (t > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (p->port_id < p->designated_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return 0;
^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) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static void br_designated_port_selection(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (p->state != BR_STATE_DISABLED &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) br_should_become_designated_port(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) br_become_designated_port(p);
^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) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static int br_supersedes_port_info(const struct net_bridge_port *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) const struct br_config_bpdu *bpdu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) int t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) t = memcmp(&bpdu->root, &p->designated_root, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (t < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) else if (t > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (bpdu->root_path_cost < p->designated_cost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) else if (bpdu->root_path_cost > p->designated_cost)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) if (t < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) else if (t > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) if (bpdu->port_id <= p->designated_port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) static void br_topology_change_acknowledged(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) br->topology_change_detected = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) del_timer(&br->tcn_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) void br_topology_change_detection(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) int isroot = br_is_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) if (br->stp_enabled != BR_KERNEL_STP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) br_info(br, "topology change detected, %s\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) isroot ? "propagating" : "sending tcn bpdu");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) if (isroot) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) __br_set_topology_change(br, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) mod_timer(&br->topology_change_timer, jiffies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) + br->bridge_forward_delay + br->bridge_max_age);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) } else if (!br->topology_change_detected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) br_transmit_tcn(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) br->topology_change_detected = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) void br_config_bpdu_generation(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (p->state != BR_STATE_DISABLED &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) br_is_designated_port(p))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) br_transmit_config(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) static void br_reply(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) br_transmit_config(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) void br_configuration_update(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) br_root_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) br_designated_port_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) void br_become_designated_port(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct net_bridge *br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) p->designated_root = br->designated_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) p->designated_cost = br->root_path_cost;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) p->designated_bridge = br->bridge_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) p->designated_port = p->port_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) static void br_make_blocking(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) if (p->state != BR_STATE_DISABLED &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) p->state != BR_STATE_BLOCKING) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (p->state == BR_STATE_FORWARDING ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) p->state == BR_STATE_LEARNING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) br_topology_change_detection(p->br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) br_set_state(p, BR_STATE_BLOCKING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) br_ifinfo_notify(RTM_NEWLINK, NULL, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) del_timer(&p->forward_delay_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) static void br_make_forwarding(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) struct net_bridge *br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) if (p->state != BR_STATE_BLOCKING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) if (br->stp_enabled == BR_NO_STP || br->forward_delay == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) br_set_state(p, BR_STATE_FORWARDING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) br_topology_change_detection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) del_timer(&p->forward_delay_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) } else if (br->stp_enabled == BR_KERNEL_STP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) br_set_state(p, BR_STATE_LISTENING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) br_set_state(p, BR_STATE_LEARNING);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) br_ifinfo_notify(RTM_NEWLINK, NULL, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (br->forward_delay != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) void br_port_state_selection(struct net_bridge *br)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) struct net_bridge_port *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) unsigned int liveports = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) list_for_each_entry(p, &br->port_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (p->state == BR_STATE_DISABLED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) /* Don't change port states if userspace is handling STP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (br->stp_enabled != BR_USER_STP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (p->port_no == br->root_port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) p->config_pending = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) p->topology_change_ack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) br_make_forwarding(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) } else if (br_is_designated_port(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) del_timer(&p->message_age_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) br_make_forwarding(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) p->config_pending = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) p->topology_change_ack = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) br_make_blocking(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) if (p->state != BR_STATE_BLOCKING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) br_multicast_enable_port(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) /* Multicast is not disabled for the port when it goes in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) * blocking state because the timers will expire and stop by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) * themselves without sending more queries.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) if (p->state == BR_STATE_FORWARDING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) ++liveports;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) if (liveports == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) netif_carrier_off(br->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) netif_carrier_on(br->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static void br_topology_change_acknowledge(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) p->topology_change_ack = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) br_transmit_config(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) void br_received_config_bpdu(struct net_bridge_port *p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) const struct br_config_bpdu *bpdu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) struct net_bridge *br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) int was_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) p->stp_xstats.rx_bpdu++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) br = p->br;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) was_root = br_is_root_bridge(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (br_supersedes_port_info(p, bpdu)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) br_record_config_information(p, bpdu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) br_configuration_update(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) br_port_state_selection(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (!br_is_root_bridge(br) && was_root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) del_timer(&br->hello_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) if (br->topology_change_detected) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) del_timer(&br->topology_change_timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) br_transmit_tcn(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) mod_timer(&br->tcn_timer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) jiffies + br->bridge_hello_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (p->port_no == br->root_port) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) br_record_config_timeout_values(br, bpdu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) br_config_bpdu_generation(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) if (bpdu->topology_change_ack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) br_topology_change_acknowledged(br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) } else if (br_is_designated_port(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) br_reply(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) void br_received_tcn_bpdu(struct net_bridge_port *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) p->stp_xstats.rx_tcn++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) if (br_is_designated_port(p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) br_info(p->br, "port %u(%s) received tcn bpdu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) (unsigned int) p->port_no, p->dev->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) br_topology_change_detection(p->br);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) br_topology_change_acknowledge(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) /* Change bridge STP parameter */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) int br_set_hello_time(struct net_bridge *br, unsigned long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) unsigned long t = clock_t_to_jiffies(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) if (t < BR_MIN_HELLO_TIME || t > BR_MAX_HELLO_TIME)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) br->bridge_hello_time = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) if (br_is_root_bridge(br))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) br->hello_time = br->bridge_hello_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) int br_set_max_age(struct net_bridge *br, unsigned long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) unsigned long t = clock_t_to_jiffies(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) if (t < BR_MIN_MAX_AGE || t > BR_MAX_MAX_AGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) br->bridge_max_age = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) if (br_is_root_bridge(br))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) br->max_age = br->bridge_max_age;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) int __set_ageing_time(struct net_device *dev, unsigned long t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) struct switchdev_attr attr = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) .orig_dev = dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) .id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) .u.ageing_time = jiffies_to_clock_t(t),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) err = switchdev_port_attr_set(dev, &attr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (err && err != -EOPNOTSUPP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) /* Set time interval that dynamic forwarding entries live
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) * For pure software bridge, allow values outside the 802.1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) * standard specification for special cases:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) * 0 - entry never ages (all permanant)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) * 1 - entry disappears (no persistance)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * Offloaded switch entries maybe more restrictive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) unsigned long t = clock_t_to_jiffies(ageing_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) err = __set_ageing_time(br->dev, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) br->bridge_ageing_time = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) br->ageing_time = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) mod_delayed_work(system_long_wq, &br->gc_work, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) /* called under bridge lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) void __br_set_topology_change(struct net_bridge *br, unsigned char val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) unsigned long t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) if (br->stp_enabled == BR_KERNEL_STP && br->topology_change != val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) /* On topology change, set the bridge ageing time to twice the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) * forward delay. Otherwise, restore its default ageing time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (val) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) t = 2 * br->forward_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) br_debug(br, "decreasing ageing time to %lu\n", t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) t = br->bridge_ageing_time;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) br_debug(br, "restoring ageing time to %lu\n", t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) err = __set_ageing_time(br->dev, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) br_warn(br, "error offloading ageing time\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) br->ageing_time = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) br->topology_change = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) void __br_set_forward_delay(struct net_bridge *br, unsigned long t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) br->bridge_forward_delay = t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) if (br_is_root_bridge(br))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) br->forward_delay = br->bridge_forward_delay;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) int br_set_forward_delay(struct net_bridge *br, unsigned long val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) unsigned long t = clock_t_to_jiffies(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) int err = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) spin_lock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) if (br->stp_enabled != BR_NO_STP &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) (t < BR_MIN_FORWARD_DELAY || t > BR_MAX_FORWARD_DELAY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) goto unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) __br_set_forward_delay(br, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) spin_unlock_bh(&br->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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