From 12ac84c4a9c505e3e30529563b04cc8f6d5ebbf3 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Mon, 20 Mar 2006 22:59:49 -0800 Subject: [PATCH] [BRIDGE]: use LLC to send STP The bridge code can use existing LLC output code when building spanning tree protocol packets. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/bridge/br_stp_bpdu.c | 128 ++++++++++++++++++--------------------- 1 file changed, 59 insertions(+), 69 deletions(-) diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c index ed3a5441a47e..8934a54792be 100644 --- a/net/bridge/br_stp_bpdu.c +++ b/net/bridge/br_stp_bpdu.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include "br_private.h" @@ -24,36 +25,31 @@ #define STP_HZ 256 -static void br_send_bpdu(struct net_bridge_port *p, unsigned char *data, int length) +#define LLC_RESERVE sizeof(struct llc_pdu_un) + +static void br_send_bpdu(struct net_bridge_port *p, + const unsigned char *data, int length) { - struct net_device *dev; struct sk_buff *skb; - int size; if (!p->br->stp_enabled) return; - size = length + 2*ETH_ALEN + 2; - if (size < 60) - size = 60; - - dev = p->dev; - - if ((skb = dev_alloc_skb(size)) == NULL) { - printk(KERN_INFO "br: memory squeeze!\n"); + skb = dev_alloc_skb(length+LLC_RESERVE); + if (!skb) return; - } - skb->dev = dev; + skb->dev = p->dev; skb->protocol = htons(ETH_P_802_2); - skb->mac.raw = skb_put(skb, size); - memcpy(skb->mac.raw, p->br->group_addr, ETH_ALEN); - memcpy(skb->mac.raw+ETH_ALEN, dev->dev_addr, ETH_ALEN); - skb->mac.raw[2*ETH_ALEN] = 0; - skb->mac.raw[2*ETH_ALEN+1] = length; - skb->nh.raw = skb->mac.raw + 2*ETH_ALEN + 2; - memcpy(skb->nh.raw, data, length); - memset(skb->nh.raw + length, 0xa5, size - length - 2*ETH_ALEN - 2); + + skb_reserve(skb, LLC_RESERVE); + memcpy(__skb_put(skb, length), data, length); + + llc_pdu_header_init(skb, LLC_PDU_TYPE_U, LLC_SAP_BSPAN, + LLC_SAP_BSPAN, LLC_PDU_CMD); + llc_pdu_init_as_ui_cmd(skb); + + llc_mac_hdr_init(skb, p->dev->dev_addr, p->br->group_addr); NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, dev_queue_xmit); @@ -76,60 +72,54 @@ static inline int br_get_ticks(const unsigned char *src) /* called under bridge lock */ void br_send_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu) { - unsigned char buf[38]; - - buf[0] = 0x42; - buf[1] = 0x42; - buf[2] = 0x03; - buf[3] = 0; - buf[4] = 0; - buf[5] = 0; - buf[6] = BPDU_TYPE_CONFIG; - buf[7] = (bpdu->topology_change ? 0x01 : 0) | + unsigned char buf[35]; + + buf[0] = 0; + buf[1] = 0; + buf[2] = 0; + buf[3] = BPDU_TYPE_CONFIG; + buf[4] = (bpdu->topology_change ? 0x01 : 0) | (bpdu->topology_change_ack ? 0x80 : 0); - buf[8] = bpdu->root.prio[0]; - buf[9] = bpdu->root.prio[1]; - buf[10] = bpdu->root.addr[0]; - buf[11] = bpdu->root.addr[1]; - buf[12] = bpdu->root.addr[2]; - buf[13] = bpdu->root.addr[3]; - buf[14] = bpdu->root.addr[4]; - buf[15] = bpdu->root.addr[5]; - buf[16] = (bpdu->root_path_cost >> 24) & 0xFF; - buf[17] = (bpdu->root_path_cost >> 16) & 0xFF; - buf[18] = (bpdu->root_path_cost >> 8) & 0xFF; - buf[19] = bpdu->root_path_cost & 0xFF; - buf[20] = bpdu->bridge_id.prio[0]; - buf[21] = bpdu->bridge_id.prio[1]; - buf[22] = bpdu->bridge_id.addr[0]; - buf[23] = bpdu->bridge_id.addr[1]; - buf[24] = bpdu->bridge_id.addr[2]; - buf[25] = bpdu->bridge_id.addr[3]; - buf[26] = bpdu->bridge_id.addr[4]; - buf[27] = bpdu->bridge_id.addr[5]; - buf[28] = (bpdu->port_id >> 8) & 0xFF; - buf[29] = bpdu->port_id & 0xFF; - - br_set_ticks(buf+30, bpdu->message_age); - br_set_ticks(buf+32, bpdu->max_age); - br_set_ticks(buf+34, bpdu->hello_time); - br_set_ticks(buf+36, bpdu->forward_delay); - - br_send_bpdu(p, buf, 38); + buf[5] = bpdu->root.prio[0]; + buf[6] = bpdu->root.prio[1]; + buf[7] = bpdu->root.addr[0]; + buf[8] = bpdu->root.addr[1]; + buf[9] = bpdu->root.addr[2]; + buf[10] = bpdu->root.addr[3]; + buf[11] = bpdu->root.addr[4]; + buf[12] = bpdu->root.addr[5]; + buf[13] = (bpdu->root_path_cost >> 24) & 0xFF; + buf[14] = (bpdu->root_path_cost >> 16) & 0xFF; + buf[15] = (bpdu->root_path_cost >> 8) & 0xFF; + buf[16] = bpdu->root_path_cost & 0xFF; + buf[17] = bpdu->bridge_id.prio[0]; + buf[18] = bpdu->bridge_id.prio[1]; + buf[19] = bpdu->bridge_id.addr[0]; + buf[20] = bpdu->bridge_id.addr[1]; + buf[21] = bpdu->bridge_id.addr[2]; + buf[22] = bpdu->bridge_id.addr[3]; + buf[23] = bpdu->bridge_id.addr[4]; + buf[24] = bpdu->bridge_id.addr[5]; + buf[25] = (bpdu->port_id >> 8) & 0xFF; + buf[26] = bpdu->port_id & 0xFF; + + br_set_ticks(buf+27, bpdu->message_age); + br_set_ticks(buf+29, bpdu->max_age); + br_set_ticks(buf+31, bpdu->hello_time); + br_set_ticks(buf+33, bpdu->forward_delay); + + br_send_bpdu(p, buf, 35); } /* called under bridge lock */ void br_send_tcn_bpdu(struct net_bridge_port *p) { - unsigned char buf[7]; - - buf[0] = 0x42; - buf[1] = 0x42; - buf[2] = 0x03; - buf[3] = 0; - buf[4] = 0; - buf[5] = 0; - buf[6] = BPDU_TYPE_TCN; + unsigned char buf[4]; + + buf[0] = 0; + buf[1] = 0; + buf[2] = 0; + buf[3] = BPDU_TYPE_TCN; br_send_bpdu(p, buf, 7); } -- 2.20.1