forked from Minki/linux
369 lines
9.8 KiB
C
369 lines
9.8 KiB
C
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/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*/
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#include "hsr_forward.h"
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/etherdevice.h>
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#include <linux/if_vlan.h>
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#include "hsr_main.h"
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#include "hsr_framereg.h"
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struct hsr_node;
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struct hsr_frame_info {
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struct sk_buff *skb_std;
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struct sk_buff *skb_hsr;
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struct hsr_port *port_rcv;
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struct hsr_node *node_src;
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u16 sequence_nr;
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bool is_supervision;
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bool is_vlan;
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bool is_local_dest;
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bool is_local_exclusive;
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};
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/* The uses I can see for these HSR supervision frames are:
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* 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
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* 22") to reset any sequence_nr counters belonging to that node. Useful if
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* the other node's counter has been reset for some reason.
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* --
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* Or not - resetting the counter and bridging the frame would create a
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* loop, unfortunately.
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*
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* 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
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* frame is received from a particular node, we know something is wrong.
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* We just register these (as with normal frames) and throw them away.
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*
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* 3) Allow different MAC addresses for the two slave interfaces, using the
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* MacAddressA field.
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*/
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static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb)
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{
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struct hsr_ethhdr_sp *hdr;
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WARN_ON_ONCE(!skb_mac_header_was_set(skb));
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hdr = (struct hsr_ethhdr_sp *) skb_mac_header(skb);
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if (!ether_addr_equal(hdr->ethhdr.h_dest,
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hsr->sup_multicast_addr))
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return false;
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if (get_hsr_stag_path(&hdr->hsr_sup) != 0x0f)
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return false;
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if ((hdr->hsr_sup.HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
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(hdr->hsr_sup.HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
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return false;
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if (hdr->hsr_sup.HSR_TLV_Length != 12)
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return false;
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return true;
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}
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static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in,
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struct hsr_frame_info *frame)
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{
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struct sk_buff *skb;
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int copylen;
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unsigned char *dst, *src;
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skb_pull(skb_in, HSR_HLEN);
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skb = __pskb_copy(skb_in, skb_headroom(skb_in) - HSR_HLEN, GFP_ATOMIC);
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skb_push(skb_in, HSR_HLEN);
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if (skb == NULL)
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return NULL;
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skb_reset_mac_header(skb);
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if (skb->ip_summed == CHECKSUM_PARTIAL)
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skb->csum_start -= HSR_HLEN;
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copylen = 2*ETH_ALEN;
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if (frame->is_vlan)
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copylen += VLAN_HLEN;
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src = skb_mac_header(skb_in);
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dst = skb_mac_header(skb);
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memcpy(dst, src, copylen);
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skb->protocol = eth_hdr(skb)->h_proto;
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return skb;
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}
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static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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if (!frame->skb_std)
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frame->skb_std = create_stripped_skb(frame->skb_hsr, frame);
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return skb_clone(frame->skb_std, GFP_ATOMIC);
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}
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static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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struct hsr_ethhdr *hsr_ethhdr;
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int lane_id;
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int lsdu_size;
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if (port->type == HSR_PT_SLAVE_A)
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lane_id = 0;
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else
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lane_id = 1;
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lsdu_size = skb->len - 14;
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if (frame->is_vlan)
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lsdu_size -= 4;
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hsr_ethhdr = (struct hsr_ethhdr *) skb_mac_header(skb);
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set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id);
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set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size);
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hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr);
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hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
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hsr_ethhdr->ethhdr.h_proto = htons(ETH_P_PRP);
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}
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static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
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struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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int movelen;
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unsigned char *dst, *src;
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struct sk_buff *skb;
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/* Create the new skb with enough headroom to fit the HSR tag */
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skb = __pskb_copy(skb_o, skb_headroom(skb_o) + HSR_HLEN, GFP_ATOMIC);
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if (skb == NULL)
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return NULL;
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skb_reset_mac_header(skb);
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if (skb->ip_summed == CHECKSUM_PARTIAL)
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skb->csum_start += HSR_HLEN;
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movelen = ETH_HLEN;
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if (frame->is_vlan)
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movelen += VLAN_HLEN;
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src = skb_mac_header(skb);
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dst = skb_push(skb, HSR_HLEN);
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memmove(dst, src, movelen);
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skb_reset_mac_header(skb);
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hsr_fill_tag(skb, frame, port);
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return skb;
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}
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/* If the original frame was an HSR tagged frame, just clone it to be sent
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* unchanged. Otherwise, create a private frame especially tagged for 'port'.
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*/
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static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame,
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struct hsr_port *port)
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{
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if (frame->skb_hsr)
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return skb_clone(frame->skb_hsr, GFP_ATOMIC);
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if ((port->type != HSR_PT_SLAVE_A) && (port->type != HSR_PT_SLAVE_B)) {
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WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port");
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return NULL;
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}
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return create_tagged_skb(frame->skb_std, frame, port);
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}
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static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev,
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struct hsr_node *node_src)
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{
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bool was_multicast_frame;
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int res;
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was_multicast_frame = (skb->pkt_type == PACKET_MULTICAST);
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hsr_addr_subst_source(node_src, skb);
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skb_pull(skb, ETH_HLEN);
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res = netif_rx(skb);
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if (res == NET_RX_DROP) {
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dev->stats.rx_dropped++;
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} else {
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += skb->len;
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if (was_multicast_frame)
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dev->stats.multicast++;
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}
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}
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static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port,
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struct hsr_frame_info *frame)
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{
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if (frame->port_rcv->type == HSR_PT_MASTER) {
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hsr_addr_subst_dest(frame->node_src, skb, port);
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/* Address substitution (IEC62439-3 pp 26, 50): replace mac
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* address of outgoing frame with that of the outgoing slave's.
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*/
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ether_addr_copy(eth_hdr(skb)->h_source, port->dev->dev_addr);
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}
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return dev_queue_xmit(skb);
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}
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/* Forward the frame through all devices except:
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* - Back through the receiving device
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* - If it's a HSR frame: through a device where it has passed before
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* - To the local HSR master only if the frame is directly addressed to it, or
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* a non-supervision multicast or broadcast frame.
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*
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* HSR slave devices should insert a HSR tag into the frame, or forward the
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* frame unchanged if it's already tagged. Interlink devices should strip HSR
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* tags if they're of the non-HSR type (but only after duplicate discard). The
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* master device always strips HSR tags.
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*/
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static void hsr_forward_do(struct hsr_frame_info *frame)
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{
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struct hsr_port *port;
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struct sk_buff *skb;
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hsr_for_each_port(frame->port_rcv->hsr, port) {
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/* Don't send frame back the way it came */
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if (port == frame->port_rcv)
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continue;
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/* Don't deliver locally unless we should */
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if ((port->type == HSR_PT_MASTER) && !frame->is_local_dest)
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continue;
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/* Deliver frames directly addressed to us to master only */
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if ((port->type != HSR_PT_MASTER) && frame->is_local_exclusive)
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continue;
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/* Don't send frame over port where it has been sent before */
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if (hsr_register_frame_out(port, frame->node_src,
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frame->sequence_nr))
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continue;
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if (frame->is_supervision && (port->type == HSR_PT_MASTER)) {
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hsr_handle_sup_frame(frame->skb_hsr,
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frame->node_src,
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frame->port_rcv);
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continue;
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}
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if (port->type != HSR_PT_MASTER)
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skb = frame_get_tagged_skb(frame, port);
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else
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skb = frame_get_stripped_skb(frame, port);
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if (skb == NULL) {
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/* FIXME: Record the dropped frame? */
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continue;
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}
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skb->dev = port->dev;
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if (port->type == HSR_PT_MASTER)
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hsr_deliver_master(skb, port->dev, frame->node_src);
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else
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hsr_xmit(skb, port, frame);
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}
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}
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static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb,
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struct hsr_frame_info *frame)
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{
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struct net_device *master_dev;
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master_dev = hsr_port_get_hsr(hsr, HSR_PT_MASTER)->dev;
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if (hsr_addr_is_self(hsr, eth_hdr(skb)->h_dest)) {
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frame->is_local_exclusive = true;
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skb->pkt_type = PACKET_HOST;
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} else {
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frame->is_local_exclusive = false;
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}
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if ((skb->pkt_type == PACKET_HOST) ||
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(skb->pkt_type == PACKET_MULTICAST) ||
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(skb->pkt_type == PACKET_BROADCAST)) {
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frame->is_local_dest = true;
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} else {
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frame->is_local_dest = false;
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}
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}
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static int hsr_fill_frame_info(struct hsr_frame_info *frame,
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struct sk_buff *skb, struct hsr_port *port)
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{
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struct ethhdr *ethhdr;
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unsigned long irqflags;
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frame->is_supervision = is_supervision_frame(port->hsr, skb);
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frame->node_src = hsr_get_node(&port->hsr->node_db, skb,
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frame->is_supervision);
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if (frame->node_src == NULL)
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return -1; /* Unknown node and !is_supervision, or no mem */
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ethhdr = (struct ethhdr *) skb_mac_header(skb);
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frame->is_vlan = false;
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if (ethhdr->h_proto == htons(ETH_P_8021Q)) {
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frame->is_vlan = true;
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/* FIXME: */
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WARN_ONCE(1, "HSR: VLAN not yet supported");
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}
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if (ethhdr->h_proto == htons(ETH_P_PRP)) {
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frame->skb_std = NULL;
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frame->skb_hsr = skb;
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frame->sequence_nr = hsr_get_skb_sequence_nr(skb);
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} else {
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frame->skb_std = skb;
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frame->skb_hsr = NULL;
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/* Sequence nr for the master node */
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spin_lock_irqsave(&port->hsr->seqnr_lock, irqflags);
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frame->sequence_nr = port->hsr->sequence_nr;
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port->hsr->sequence_nr++;
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spin_unlock_irqrestore(&port->hsr->seqnr_lock, irqflags);
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}
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frame->port_rcv = port;
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check_local_dest(port->hsr, skb, frame);
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return 0;
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}
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/* Must be called holding rcu read lock (because of the port parameter) */
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void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port)
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{
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struct hsr_frame_info frame;
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if (skb_mac_header(skb) != skb->data) {
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WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n",
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__FILE__, __LINE__, port->dev->name);
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goto out_drop;
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}
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if (hsr_fill_frame_info(&frame, skb, port) < 0)
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goto out_drop;
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hsr_register_frame_in(frame.node_src, port, frame.sequence_nr);
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hsr_forward_do(&frame);
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if (frame.skb_hsr != NULL)
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kfree_skb(frame.skb_hsr);
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if (frame.skb_std != NULL)
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kfree_skb(frame.skb_std);
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return;
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out_drop:
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port->dev->stats.tx_dropped++;
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kfree_skb(skb);
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}
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