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595 lines
16 KiB
595 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright 2011-2014 Autronica Fire and Security AS |
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* |
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* Author(s): |
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* 2011-2014 Arvid Brodin, [email protected] |
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* |
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* Frame router for HSR and PRP. |
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*/ |
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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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/* 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 ethhdr *eth_hdr; |
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struct hsr_sup_tag *hsr_sup_tag; |
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struct hsrv1_ethhdr_sp *hsr_V1_hdr; |
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WARN_ON_ONCE(!skb_mac_header_was_set(skb)); |
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eth_hdr = (struct ethhdr *)skb_mac_header(skb); |
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/* Correct addr? */ |
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if (!ether_addr_equal(eth_hdr->h_dest, |
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hsr->sup_multicast_addr)) |
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return false; |
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/* Correct ether type?. */ |
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if (!(eth_hdr->h_proto == htons(ETH_P_PRP) || |
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eth_hdr->h_proto == htons(ETH_P_HSR))) |
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return false; |
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/* Get the supervision header from correct location. */ |
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if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */ |
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hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb); |
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if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP)) |
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return false; |
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hsr_sup_tag = &hsr_V1_hdr->hsr_sup; |
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} else { |
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hsr_sup_tag = |
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&((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup; |
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} |
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if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE && |
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hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK && |
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hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DD && |
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hsr_sup_tag->HSR_TLV_type != PRP_TLV_LIFE_CHECK_DA) |
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return false; |
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if (hsr_sup_tag->HSR_TLV_length != 12 && |
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hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload)) |
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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_hsr(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) |
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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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struct sk_buff *hsr_get_untagged_frame(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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if (frame->skb_hsr) { |
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frame->skb_std = |
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create_stripped_skb_hsr(frame->skb_hsr, frame); |
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} else { |
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/* Unexpected */ |
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WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n", |
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__FILE__, __LINE__, port->dev->name); |
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return NULL; |
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} |
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} |
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return skb_clone(frame->skb_std, GFP_ATOMIC); |
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} |
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struct sk_buff *prp_get_untagged_frame(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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if (frame->skb_prp) { |
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/* trim the skb by len - HSR_HLEN to exclude RCT */ |
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skb_trim(frame->skb_prp, |
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frame->skb_prp->len - HSR_HLEN); |
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frame->skb_std = |
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__pskb_copy(frame->skb_prp, |
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skb_headroom(frame->skb_prp), |
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GFP_ATOMIC); |
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} else { |
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/* Unexpected */ |
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WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n", |
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__FILE__, __LINE__, port->dev->name); |
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return NULL; |
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} |
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} |
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return skb_clone(frame->skb_std, GFP_ATOMIC); |
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} |
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static void prp_set_lan_id(struct prp_rct *trailer, |
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struct hsr_port *port) |
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{ |
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int lane_id; |
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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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/* Add net_id in the upper 3 bits of lane_id */ |
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lane_id |= port->hsr->net_id; |
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set_prp_lan_id(trailer, lane_id); |
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} |
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/* Tailroom for PRP rct should have been created before calling this */ |
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static struct sk_buff *prp_fill_rct(struct sk_buff *skb, |
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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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struct prp_rct *trailer; |
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int min_size = ETH_ZLEN; |
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int lsdu_size; |
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if (!skb) |
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return skb; |
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if (frame->is_vlan) |
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min_size = VLAN_ETH_ZLEN; |
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if (skb_put_padto(skb, min_size)) |
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return NULL; |
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trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN); |
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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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prp_set_lan_id(trailer, port); |
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set_prp_LSDU_size(trailer, lsdu_size); |
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trailer->sequence_nr = htons(frame->sequence_nr); |
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trailer->PRP_suffix = htons(ETH_P_PRP); |
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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 void hsr_set_path_id(struct hsr_ethhdr *hsr_ethhdr, |
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struct hsr_port *port) |
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{ |
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int path_id; |
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if (port->type == HSR_PT_SLAVE_A) |
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path_id = 0; |
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else |
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path_id = 1; |
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set_hsr_tag_path(&hsr_ethhdr->hsr_tag, path_id); |
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} |
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static struct sk_buff *hsr_fill_tag(struct sk_buff *skb, |
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struct hsr_frame_info *frame, |
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struct hsr_port *port, u8 proto_version) |
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{ |
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struct hsr_ethhdr *hsr_ethhdr; |
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int lsdu_size; |
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/* pad to minimum packet size which is 60 + 6 (HSR tag) */ |
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if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN)) |
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return NULL; |
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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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hsr_set_path_id(hsr_ethhdr, port); |
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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(proto_version ? |
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ETH_P_HSR : ETH_P_PRP); |
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skb->protocol = hsr_ethhdr->ethhdr.h_proto; |
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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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struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame, |
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struct hsr_port *port) |
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{ |
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unsigned char *dst, *src; |
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struct sk_buff *skb; |
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int movelen; |
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if (frame->skb_hsr) { |
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struct hsr_ethhdr *hsr_ethhdr = |
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(struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr); |
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/* set the lane id properly */ |
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hsr_set_path_id(hsr_ethhdr, port); |
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return skb_clone(frame->skb_hsr, GFP_ATOMIC); |
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} else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) { |
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return skb_clone(frame->skb_std, GFP_ATOMIC); |
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} |
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/* Create the new skb with enough headroom to fit the HSR tag */ |
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skb = __pskb_copy(frame->skb_std, |
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skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC); |
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if (!skb) |
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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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/* skb_put_padto free skb on error and hsr_fill_tag returns NULL in |
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* that case |
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*/ |
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return hsr_fill_tag(skb, frame, port, port->hsr->prot_version); |
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} |
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struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame, |
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struct hsr_port *port) |
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{ |
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struct sk_buff *skb; |
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if (frame->skb_prp) { |
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struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp); |
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if (trailer) { |
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prp_set_lan_id(trailer, port); |
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} else { |
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WARN_ONCE(!trailer, "errored PRP skb"); |
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return NULL; |
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} |
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return skb_clone(frame->skb_prp, GFP_ATOMIC); |
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} else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) { |
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return skb_clone(frame->skb_std, GFP_ATOMIC); |
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} |
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skb = skb_copy_expand(frame->skb_std, 0, |
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skb_tailroom(frame->skb_std) + HSR_HLEN, |
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GFP_ATOMIC); |
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prp_fill_rct(skb, frame, port); |
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return skb; |
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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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bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port) |
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{ |
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return ((frame->port_rcv->type == HSR_PT_SLAVE_A && |
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port->type == HSR_PT_SLAVE_B) || |
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(frame->port_rcv->type == HSR_PT_SLAVE_B && |
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port->type == HSR_PT_SLAVE_A)); |
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} |
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bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port) |
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{ |
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if (port->dev->features & NETIF_F_HW_HSR_FWD) |
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return prp_drop_frame(frame, port); |
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return false; |
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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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* - if it's a PRP frame: through another PRP slave device (no bridge) |
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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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bool sent = false; |
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hsr_for_each_port(frame->port_rcv->hsr, port) { |
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struct hsr_priv *hsr = port->hsr; |
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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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/* If hardware duplicate generation is enabled, only send out |
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* one port. |
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*/ |
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if ((port->dev->features & NETIF_F_HW_HSR_DUP) && sent) |
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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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* Also fro SAN, this shouldn't be done. |
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*/ |
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if (!frame->is_from_san && |
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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); |
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continue; |
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} |
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/* Check if frame is to be dropped. Eg. for PRP no forward |
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* between ports. |
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*/ |
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if (hsr->proto_ops->drop_frame && |
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hsr->proto_ops->drop_frame(frame, port)) |
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continue; |
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if (port->type != HSR_PT_MASTER) |
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skb = hsr->proto_ops->create_tagged_frame(frame, port); |
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else |
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skb = hsr->proto_ops->get_untagged_frame(frame, port); |
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if (!skb) { |
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frame->port_rcv->dev->stats.rx_dropped++; |
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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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if (!hsr_xmit(skb, port, frame)) |
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sent = true; |
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} |
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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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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 void handle_std_frame(struct sk_buff *skb, |
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struct hsr_frame_info *frame) |
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{ |
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struct hsr_port *port = frame->port_rcv; |
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struct hsr_priv *hsr = port->hsr; |
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unsigned long irqflags; |
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frame->skb_hsr = NULL; |
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frame->skb_prp = NULL; |
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frame->skb_std = skb; |
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if (port->type != HSR_PT_MASTER) { |
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frame->is_from_san = true; |
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} else { |
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/* Sequence nr for the master node */ |
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spin_lock_irqsave(&hsr->seqnr_lock, irqflags); |
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frame->sequence_nr = hsr->sequence_nr; |
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hsr->sequence_nr++; |
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spin_unlock_irqrestore(&hsr->seqnr_lock, irqflags); |
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} |
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} |
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int hsr_fill_frame_info(__be16 proto, struct sk_buff *skb, |
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struct hsr_frame_info *frame) |
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{ |
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struct hsr_port *port = frame->port_rcv; |
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struct hsr_priv *hsr = port->hsr; |
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/* HSRv0 supervisory frames double as a tag so treat them as tagged. */ |
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if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) || |
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proto == htons(ETH_P_HSR)) { |
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/* Check if skb contains hsr_ethhdr */ |
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if (skb->mac_len < sizeof(struct hsr_ethhdr)) |
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return -EINVAL; |
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/* HSR tagged frame :- Data or Supervision */ |
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frame->skb_std = NULL; |
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frame->skb_prp = 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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return 0; |
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} |
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/* Standard frame or PRP from master port */ |
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handle_std_frame(skb, frame); |
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return 0; |
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} |
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|
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int prp_fill_frame_info(__be16 proto, struct sk_buff *skb, |
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struct hsr_frame_info *frame) |
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{ |
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/* Supervision frame */ |
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struct prp_rct *rct = skb_get_PRP_rct(skb); |
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if (rct && |
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prp_check_lsdu_size(skb, rct, frame->is_supervision)) { |
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frame->skb_hsr = NULL; |
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frame->skb_std = NULL; |
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frame->skb_prp = skb; |
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frame->sequence_nr = prp_get_skb_sequence_nr(rct); |
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return 0; |
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} |
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handle_std_frame(skb, frame); |
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return 0; |
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} |
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static int 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 hsr_priv *hsr = port->hsr; |
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struct hsr_vlan_ethhdr *vlan_hdr; |
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struct ethhdr *ethhdr; |
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__be16 proto; |
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int ret; |
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|
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/* Check if skb contains ethhdr */ |
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if (skb->mac_len < sizeof(struct ethhdr)) |
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return -EINVAL; |
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|
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memset(frame, 0, sizeof(*frame)); |
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frame->is_supervision = is_supervision_frame(port->hsr, skb); |
|
frame->node_src = hsr_get_node(port, &hsr->node_db, skb, |
|
frame->is_supervision, |
|
port->type); |
|
if (!frame->node_src) |
|
return -1; /* Unknown node and !is_supervision, or no mem */ |
|
|
|
ethhdr = (struct ethhdr *)skb_mac_header(skb); |
|
frame->is_vlan = false; |
|
proto = ethhdr->h_proto; |
|
|
|
if (proto == htons(ETH_P_8021Q)) |
|
frame->is_vlan = true; |
|
|
|
if (frame->is_vlan) { |
|
vlan_hdr = (struct hsr_vlan_ethhdr *)ethhdr; |
|
proto = vlan_hdr->vlanhdr.h_vlan_encapsulated_proto; |
|
/* FIXME: */ |
|
netdev_warn_once(skb->dev, "VLAN not yet supported"); |
|
} |
|
|
|
frame->is_from_san = false; |
|
frame->port_rcv = port; |
|
ret = hsr->proto_ops->fill_frame_info(proto, skb, frame); |
|
if (ret) |
|
return ret; |
|
|
|
check_local_dest(port->hsr, skb, frame); |
|
|
|
return 0; |
|
} |
|
|
|
/* Must be called holding rcu read lock (because of the port parameter) */ |
|
void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port) |
|
{ |
|
struct hsr_frame_info frame; |
|
|
|
if (fill_frame_info(&frame, skb, port) < 0) |
|
goto out_drop; |
|
|
|
hsr_register_frame_in(frame.node_src, port, frame.sequence_nr); |
|
hsr_forward_do(&frame); |
|
/* Gets called for ingress frames as well as egress from master port. |
|
* So check and increment stats for master port only here. |
|
*/ |
|
if (port->type == HSR_PT_MASTER) { |
|
port->dev->stats.tx_packets++; |
|
port->dev->stats.tx_bytes += skb->len; |
|
} |
|
|
|
kfree_skb(frame.skb_hsr); |
|
kfree_skb(frame.skb_prp); |
|
kfree_skb(frame.skb_std); |
|
return; |
|
|
|
out_drop: |
|
port->dev->stats.tx_dropped++; |
|
kfree_skb(skb); |
|
}
|
|
|