1 // SPDX-License-Identifier: GPL-2.0-or-later
44 	skb->dev = p->dev;  in br_send_bpdu()
45 	skb->protocol = htons(ETH_P_802_2);  in br_send_bpdu()
46 	skb->priority = TC_PRIO_CONTROL;  in br_send_bpdu()
55 	llc_mac_hdr_init(skb, p->dev->dev_addr, p->br->group_addr);  in br_send_bpdu()
60 		dev_net(p->dev), NULL, skb, NULL, skb->dev,  in br_send_bpdu()
83 	if (p->br->stp_enabled != BR_KERNEL_STP)  in br_send_config_bpdu()
87 	buf[1] = 0;  in br_send_config_bpdu()
90 	buf[4] = (bpdu->topology_change ? 0x01 : 0) |  in br_send_config_bpdu()
91 		(bpdu->topology_change_ack ? 0x80 : 0);  in br_send_config_bpdu()
92 	buf[5] = bpdu->root.prio[0];  in br_send_config_bpdu()
93 	buf[6] = bpdu->root.prio[1];  in br_send_config_bpdu()
94 	buf[7] = bpdu->root.addr[0];  in br_send_config_bpdu()
95 	buf[8] = bpdu->root.addr[1];  in br_send_config_bpdu()
96 	buf[9] = bpdu->root.addr[2];  in br_send_config_bpdu()
97 	buf[10] = bpdu->root.addr[3];  in br_send_config_bpdu()
98 	buf[11] = bpdu->root.addr[4];  in br_send_config_bpdu()
99 	buf[12] = bpdu->root.addr[5];  in br_send_config_bpdu()
100 	buf[13] = (bpdu->root_path_cost >> 24) & 0xFF;  in br_send_config_bpdu()
101 	buf[14] = (bpdu->root_path_cost >> 16) & 0xFF;  in br_send_config_bpdu()
102 	buf[15] = (bpdu->root_path_cost >> 8) & 0xFF;  in br_send_config_bpdu()
103 	buf[16] = bpdu->root_path_cost & 0xFF;  in br_send_config_bpdu()
104 	buf[17] = bpdu->bridge_id.prio[0];  in br_send_config_bpdu()
105 	buf[18] = bpdu->bridge_id.prio[1];  in br_send_config_bpdu()
106 	buf[19] = bpdu->bridge_id.addr[0];  in br_send_config_bpdu()
107 	buf[20] = bpdu->bridge_id.addr[1];  in br_send_config_bpdu()
108 	buf[21] = bpdu->bridge_id.addr[2];  in br_send_config_bpdu()
109 	buf[22] = bpdu->bridge_id.addr[3];  in br_send_config_bpdu()
110 	buf[23] = bpdu->bridge_id.addr[4];  in br_send_config_bpdu()
111 	buf[24] = bpdu->bridge_id.addr[5];  in br_send_config_bpdu()
112 	buf[25] = (bpdu->port_id >> 8) & 0xFF;  in br_send_config_bpdu()
113 	buf[26] = bpdu->port_id & 0xFF;  in br_send_config_bpdu()
115 	br_set_ticks(buf+27, bpdu->message_age);  in br_send_config_bpdu()
116 	br_set_ticks(buf+29, bpdu->max_age);  in br_send_config_bpdu()
117 	br_set_ticks(buf+31, bpdu->hello_time);  in br_send_config_bpdu()
118 	br_set_ticks(buf+33, bpdu->forward_delay);  in br_send_config_bpdu()
122 	p->stp_xstats.tx_bpdu++;  in br_send_config_bpdu()
130 	if (p->br->stp_enabled != BR_KERNEL_STP)  in br_send_tcn_bpdu()
134 	buf[1] = 0;  in br_send_tcn_bpdu()
139 	p->stp_xstats.tx_tcn++;  in br_send_tcn_bpdu()
151 	struct net_bridge *br;  in br_stp_rcv()  local
158 	buf = skb->data;  in br_stp_rcv()
159 	if (buf[0] != 0 || buf[1] != 0 || buf[2] != 0)  in br_stp_rcv()
166 	br = p->br;  in br_stp_rcv()
167 	spin_lock(&br->lock);  in br_stp_rcv()
169 	if (br->stp_enabled != BR_KERNEL_STP)  in br_stp_rcv()
172 	if (!(br->dev->flags & IFF_UP))  in br_stp_rcv()
175 	if (p->state == BR_STATE_DISABLED)  in br_stp_rcv()
178 	if (!ether_addr_equal(eth_hdr(skb)->h_dest, br->group_addr))  in br_stp_rcv()
181 	if (p->flags & BR_BPDU_GUARD) {  in br_stp_rcv()
182 		br_notice(br, "BPDU received on blocked port %u(%s)\n",  in br_stp_rcv()
183 			  (unsigned int) p->port_no, p->dev->name);  in br_stp_rcv()
196 		buf = skb->data;  in br_stp_rcv()
197 		bpdu.topology_change = (buf[1] & 0x01) ? 1 : 0;  in br_stp_rcv()
198 		bpdu.topology_change_ack = (buf[1] & 0x80) ? 1 : 0;  in br_stp_rcv()
201 		bpdu.root.prio[1] = buf[3];  in br_stp_rcv()
203 		bpdu.root.addr[1] = buf[5];  in br_stp_rcv()
209 			(buf[10] << 24) |  in br_stp_rcv()
214 		bpdu.bridge_id.prio[1] = buf[15];  in br_stp_rcv()
216 		bpdu.bridge_id.addr[1] = buf[17];  in br_stp_rcv()
230 				br_notice(p->br,  in br_stp_rcv()
233 					  p->port_no,  in br_stp_rcv()
234 					  eth_hdr(skb)->h_source,  in br_stp_rcv()
244 	spin_unlock(&br->lock);  in br_stp_rcv()