[Bridge] STP Explanation (2)
shenry82
shenry82 at voila.fr
Thu Jun 30 03:51:59 PDT 2005
I saw some big mistakes, here's the correct version :
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void br_send_config_bpdu(struct net_bridge_port *p, struct bpdu *bpdu)
{
unsigned char buf[42];
buf[0] = bpdu->bpdu_header.protocol[0]; //0x00
buf[1] = bpdu->bpdu_header.protocol[1]; //0x00
buf[2] = bpdu->bpdu_header.version; //0x02
buf[3] = BPDU_TYPE_CONFIG;
buf[4] = bpdu->bpdu_body.flags.topo_change;
buf[5] = bpdu->bpdu_body.flags.proposal;
buf[6] = bpdu->bpdu_body.flags.port_role[0];
buf[7] = bpdu->bpdu_body.flags.port_role[1];
buf[8] = bpdu->bpdu_body.flags.learning;
buf[9] = bpdu->bpdu_body.flags.forwarding;
buf[10] = bpdu->bpdu_body.flags.agreement;
buf[11] = bpdu->bpdu_body.flags.topo_change_ack;
buf[12] = bpdu->bpdu_body.root_id.prio[0];
buf[13] = bpdu->bpdu_body.root_id.prio[1];
buf[14] = bpdu->bpdu_body.root_id.addr[0];
buf[15] = bpdu->bpdu_body.root_id.addr[1];
buf[16] = bpdu->bpdu_body.root_id.addr[2];
buf[17] = bpdu->bpdu_body.root_id.addr[3];
buf[18] = bpdu->bpdu_body.root_id.addr[4];
buf[19] = bpdu->bpdu_body.root_id.addr[5];
buf[20] = (bpdu->bpdu_body.root_path_cost >> 24) & 0xFF;
buf[21] = (bpdu->bpdu_body.root_path_cost >> 16) & 0xFF;
buf[22] = (bpdu->bpdu_body.root_path_cost >> 8) & 0xFF;
buf[23] = bpdu->bpdu_body.root_path_cost & 0xFF;
buf[24] = bpdu->bpdu_body.bridge_id.prio[0];
buf[25] = bpdu->bpdu_body.bridge_id.prio[1];
buf[26] = bpdu->bpdu_body.bridge_id.addr[0];
buf[27] = bpdu->bpdu_body.bridge_id.addr[1];
buf[28] = bpdu->bpdu_body.bridge_id.addr[2];
buf[29] = bpdu->bpdu_body.bridge_id.addr[3];
buf[30] = bpdu->bpdu_body.bridge_id.addr[4];
buf[31] = bpdu->bpdu_body.bridge_id.addr[5];
buf[32] = (bpdu->bpdu_body.port_id >> 8) & 0xFF;
buf[33] = bpdu->bpdu_body.port_id & 0xFF;
br_set_ticks(buf+34, bpdu->bpdu_body.message_age);
br_set_ticks(buf+36, bpdu->bpdu_body.max_age);
br_set_ticks(buf+38, bpdu->bpdu_body.hello_time);
br_set_ticks(buf+40, bpdu->bpdu_body.forward_delay);
br_send_bpdu(p, buf, 42);
}
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I also modified the following function like this :
------------------------------------------------------------------------------
/* called under bridge lock */
void br_send_tcn_bpdu(struct net_bridge_port *p)
{
unsigned char buf[4];
buf[0] = bpdu->bpdu_header.protocol[0]; //0x00
buf[1] = bpdu->bpdu_header.protocol[1]; //0x00
buf[2] = bpdu->bpdu_header.version; //0x02
buf[3] = BPDU_TYPE_TCN;
br_send_bpdu(p, buf, 4);
}
static unsigned char header[3] = {0x00, 0x00, 0x02};
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please tell me what do you think of because if i'm getting the wrong way, i prefer to know it quickly. ^^
regards,
Simon Henry
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