diff options
Diffstat (limited to 'net/hsr/hsr_forward.c')
-rw-r--r-- | net/hsr/hsr_forward.c | 437 |
1 files changed, 349 insertions, 88 deletions
diff --git a/net/hsr/hsr_forward.c b/net/hsr/hsr_forward.c index ddd9605bad04..a50429a62f74 100644 --- a/net/hsr/hsr_forward.c +++ b/net/hsr/hsr_forward.c @@ -3,6 +3,8 @@ * * Author(s): * 2011-2014 Arvid Brodin, arvid.brodin@alten.se + * + * Frame router for HSR and PRP. */ #include "hsr_forward.h" @@ -15,18 +17,6 @@ struct hsr_node; -struct hsr_frame_info { - struct sk_buff *skb_std; - struct sk_buff *skb_hsr; - struct hsr_port *port_rcv; - struct hsr_node *node_src; - u16 sequence_nr; - bool is_supervision; - bool is_vlan; - bool is_local_dest; - bool is_local_exclusive; -}; - /* The uses I can see for these HSR supervision frames are: * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type = * 22") to reset any sequence_nr counters belonging to that node. Useful if @@ -47,6 +37,8 @@ static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb) struct ethhdr *eth_hdr; struct hsr_sup_tag *hsr_sup_tag; struct hsrv1_ethhdr_sp *hsr_V1_hdr; + struct hsr_sup_tlv *hsr_sup_tlv; + u16 total_length = 0; WARN_ON_ONCE(!skb_mac_header_was_set(skb)); eth_hdr = (struct ethhdr *)skb_mac_header(skb); @@ -63,28 +55,70 @@ static bool is_supervision_frame(struct hsr_priv *hsr, struct sk_buff *skb) /* Get the supervision header from correct location. */ if (eth_hdr->h_proto == htons(ETH_P_HSR)) { /* Okay HSRv1. */ + total_length = sizeof(struct hsrv1_ethhdr_sp); + if (!pskb_may_pull(skb, total_length)) + return false; + hsr_V1_hdr = (struct hsrv1_ethhdr_sp *)skb_mac_header(skb); if (hsr_V1_hdr->hsr.encap_proto != htons(ETH_P_PRP)) return false; hsr_sup_tag = &hsr_V1_hdr->hsr_sup; } else { + total_length = sizeof(struct hsrv0_ethhdr_sp); + if (!pskb_may_pull(skb, total_length)) + return false; + hsr_sup_tag = &((struct hsrv0_ethhdr_sp *)skb_mac_header(skb))->hsr_sup; } - if (hsr_sup_tag->HSR_TLV_type != HSR_TLV_ANNOUNCE && - hsr_sup_tag->HSR_TLV_type != HSR_TLV_LIFE_CHECK) + if (hsr_sup_tag->tlv.HSR_TLV_type != HSR_TLV_ANNOUNCE && + hsr_sup_tag->tlv.HSR_TLV_type != HSR_TLV_LIFE_CHECK && + hsr_sup_tag->tlv.HSR_TLV_type != PRP_TLV_LIFE_CHECK_DD && + hsr_sup_tag->tlv.HSR_TLV_type != PRP_TLV_LIFE_CHECK_DA) + return false; + if (hsr_sup_tag->tlv.HSR_TLV_length != 12 && + hsr_sup_tag->tlv.HSR_TLV_length != sizeof(struct hsr_sup_payload)) return false; - if (hsr_sup_tag->HSR_TLV_length != 12 && - hsr_sup_tag->HSR_TLV_length != sizeof(struct hsr_sup_payload)) + + /* Get next tlv */ + total_length += sizeof(struct hsr_sup_tlv) + hsr_sup_tag->tlv.HSR_TLV_length; + if (!pskb_may_pull(skb, total_length)) + return false; + skb_pull(skb, total_length); + hsr_sup_tlv = (struct hsr_sup_tlv *)skb->data; + skb_push(skb, total_length); + + /* if this is a redbox supervision frame we need to verify + * that more data is available + */ + if (hsr_sup_tlv->HSR_TLV_type == PRP_TLV_REDBOX_MAC) { + /* tlv length must be a length of a mac address */ + if (hsr_sup_tlv->HSR_TLV_length != sizeof(struct hsr_sup_payload)) + return false; + + /* make sure another tlv follows */ + total_length += sizeof(struct hsr_sup_tlv) + hsr_sup_tlv->HSR_TLV_length; + if (!pskb_may_pull(skb, total_length)) + return false; + + /* get next tlv */ + skb_pull(skb, total_length); + hsr_sup_tlv = (struct hsr_sup_tlv *)skb->data; + skb_push(skb, total_length); + } + + /* end of tlvs must follow at the end */ + if (hsr_sup_tlv->HSR_TLV_type == HSR_TLV_EOT && + hsr_sup_tlv->HSR_TLV_length != 0) return false; return true; } -static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in, - struct hsr_frame_info *frame) +static struct sk_buff *create_stripped_skb_hsr(struct sk_buff *skb_in, + struct hsr_frame_info *frame) { struct sk_buff *skb; int copylen; @@ -112,50 +146,158 @@ static struct sk_buff *create_stripped_skb(struct sk_buff *skb_in, return skb; } -static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame, - struct hsr_port *port) +struct sk_buff *hsr_get_untagged_frame(struct hsr_frame_info *frame, + struct hsr_port *port) +{ + if (!frame->skb_std) { + if (frame->skb_hsr) + frame->skb_std = + create_stripped_skb_hsr(frame->skb_hsr, frame); + else + netdev_warn_once(port->dev, + "Unexpected frame received in hsr_get_untagged_frame()\n"); + + if (!frame->skb_std) + return NULL; + } + + return skb_clone(frame->skb_std, GFP_ATOMIC); +} + +struct sk_buff *prp_get_untagged_frame(struct hsr_frame_info *frame, + struct hsr_port *port) { - if (!frame->skb_std) - frame->skb_std = create_stripped_skb(frame->skb_hsr, frame); + if (!frame->skb_std) { + if (frame->skb_prp) { + /* trim the skb by len - HSR_HLEN to exclude RCT */ + skb_trim(frame->skb_prp, + frame->skb_prp->len - HSR_HLEN); + frame->skb_std = + __pskb_copy(frame->skb_prp, + skb_headroom(frame->skb_prp), + GFP_ATOMIC); + } else { + /* Unexpected */ + WARN_ONCE(1, "%s:%d: Unexpected frame received (port_src %s)\n", + __FILE__, __LINE__, port->dev->name); + return NULL; + } + } + return skb_clone(frame->skb_std, GFP_ATOMIC); } -static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame, - struct hsr_port *port, u8 proto_version) +static void prp_set_lan_id(struct prp_rct *trailer, + struct hsr_port *port) { - struct hsr_ethhdr *hsr_ethhdr; int lane_id; - int lsdu_size; if (port->type == HSR_PT_SLAVE_A) lane_id = 0; else lane_id = 1; + /* Add net_id in the upper 3 bits of lane_id */ + lane_id |= port->hsr->net_id; + set_prp_lan_id(trailer, lane_id); +} + +/* Tailroom for PRP rct should have been created before calling this */ +static struct sk_buff *prp_fill_rct(struct sk_buff *skb, + struct hsr_frame_info *frame, + struct hsr_port *port) +{ + struct prp_rct *trailer; + int min_size = ETH_ZLEN; + int lsdu_size; + + if (!skb) + return skb; + + if (frame->is_vlan) + min_size = VLAN_ETH_ZLEN; + + if (skb_put_padto(skb, min_size)) + return NULL; + + trailer = (struct prp_rct *)skb_put(skb, HSR_HLEN); + lsdu_size = skb->len - 14; + if (frame->is_vlan) + lsdu_size -= 4; + prp_set_lan_id(trailer, port); + set_prp_LSDU_size(trailer, lsdu_size); + trailer->sequence_nr = htons(frame->sequence_nr); + trailer->PRP_suffix = htons(ETH_P_PRP); + skb->protocol = eth_hdr(skb)->h_proto; + + return skb; +} + +static void hsr_set_path_id(struct hsr_ethhdr *hsr_ethhdr, + struct hsr_port *port) +{ + int path_id; + + if (port->type == HSR_PT_SLAVE_A) + path_id = 0; + else + path_id = 1; + + set_hsr_tag_path(&hsr_ethhdr->hsr_tag, path_id); +} + +static struct sk_buff *hsr_fill_tag(struct sk_buff *skb, + struct hsr_frame_info *frame, + struct hsr_port *port, u8 proto_version) +{ + struct hsr_ethhdr *hsr_ethhdr; + int lsdu_size; + + /* pad to minimum packet size which is 60 + 6 (HSR tag) */ + if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN)) + return NULL; + lsdu_size = skb->len - 14; if (frame->is_vlan) lsdu_size -= 4; hsr_ethhdr = (struct hsr_ethhdr *)skb_mac_header(skb); - set_hsr_tag_path(&hsr_ethhdr->hsr_tag, lane_id); + hsr_set_path_id(hsr_ethhdr, port); set_hsr_tag_LSDU_size(&hsr_ethhdr->hsr_tag, lsdu_size); hsr_ethhdr->hsr_tag.sequence_nr = htons(frame->sequence_nr); hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto; hsr_ethhdr->ethhdr.h_proto = htons(proto_version ? ETH_P_HSR : ETH_P_PRP); + skb->protocol = hsr_ethhdr->ethhdr.h_proto; + + return skb; } -static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o, - struct hsr_frame_info *frame, - struct hsr_port *port) +/* If the original frame was an HSR tagged frame, just clone it to be sent + * unchanged. Otherwise, create a private frame especially tagged for 'port'. + */ +struct sk_buff *hsr_create_tagged_frame(struct hsr_frame_info *frame, + struct hsr_port *port) { - int movelen; unsigned char *dst, *src; struct sk_buff *skb; + int movelen; + + if (frame->skb_hsr) { + struct hsr_ethhdr *hsr_ethhdr = + (struct hsr_ethhdr *)skb_mac_header(frame->skb_hsr); + + /* set the lane id properly */ + hsr_set_path_id(hsr_ethhdr, port); + return skb_clone(frame->skb_hsr, GFP_ATOMIC); + } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) { + return skb_clone(frame->skb_std, GFP_ATOMIC); + } /* Create the new skb with enough headroom to fit the HSR tag */ - skb = __pskb_copy(skb_o, skb_headroom(skb_o) + HSR_HLEN, GFP_ATOMIC); + skb = __pskb_copy(frame->skb_std, + skb_headroom(frame->skb_std) + HSR_HLEN, GFP_ATOMIC); if (!skb) return NULL; skb_reset_mac_header(skb); @@ -172,26 +314,37 @@ static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o, memmove(dst, src, movelen); skb_reset_mac_header(skb); - hsr_fill_tag(skb, frame, port, port->hsr->prot_version); - - return skb; + /* skb_put_padto free skb on error and hsr_fill_tag returns NULL in + * that case + */ + return hsr_fill_tag(skb, frame, port, port->hsr->prot_version); } -/* If the original frame was an HSR tagged frame, just clone it to be sent - * unchanged. Otherwise, create a private frame especially tagged for 'port'. - */ -static struct sk_buff *frame_get_tagged_skb(struct hsr_frame_info *frame, - struct hsr_port *port) +struct sk_buff *prp_create_tagged_frame(struct hsr_frame_info *frame, + struct hsr_port *port) { - if (frame->skb_hsr) - return skb_clone(frame->skb_hsr, GFP_ATOMIC); + struct sk_buff *skb; - if (port->type != HSR_PT_SLAVE_A && port->type != HSR_PT_SLAVE_B) { - WARN_ONCE(1, "HSR: Bug: trying to create a tagged frame for a non-ring port"); - return NULL; + if (frame->skb_prp) { + struct prp_rct *trailer = skb_get_PRP_rct(frame->skb_prp); + + if (trailer) { + prp_set_lan_id(trailer, port); + } else { + WARN_ONCE(!trailer, "errored PRP skb"); + return NULL; + } + return skb_clone(frame->skb_prp, GFP_ATOMIC); + } else if (port->dev->features & NETIF_F_HW_HSR_TAG_INS) { + return skb_clone(frame->skb_std, GFP_ATOMIC); } - return create_tagged_skb(frame->skb_std, frame, port); + skb = skb_copy_expand(frame->skb_std, 0, + skb_tailroom(frame->skb_std) + HSR_HLEN, + GFP_ATOMIC); + prp_fill_rct(skb, frame, port); + + return skb; } static void hsr_deliver_master(struct sk_buff *skb, struct net_device *dev, @@ -228,9 +381,26 @@ static int hsr_xmit(struct sk_buff *skb, struct hsr_port *port, return dev_queue_xmit(skb); } +bool prp_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port) +{ + return ((frame->port_rcv->type == HSR_PT_SLAVE_A && + port->type == HSR_PT_SLAVE_B) || + (frame->port_rcv->type == HSR_PT_SLAVE_B && + port->type == HSR_PT_SLAVE_A)); +} + +bool hsr_drop_frame(struct hsr_frame_info *frame, struct hsr_port *port) +{ + if (port->dev->features & NETIF_F_HW_HSR_FWD) + return prp_drop_frame(frame, port); + + return false; +} + /* Forward the frame through all devices except: * - Back through the receiving device * - If it's a HSR frame: through a device where it has passed before + * - if it's a PRP frame: through another PRP slave device (no bridge) * - To the local HSR master only if the frame is directly addressed to it, or * a non-supervision multicast or broadcast frame. * @@ -243,8 +413,10 @@ static void hsr_forward_do(struct hsr_frame_info *frame) { struct hsr_port *port; struct sk_buff *skb; + bool sent = false; hsr_for_each_port(frame->port_rcv->hsr, port) { + struct hsr_priv *hsr = port->hsr; /* Don't send frame back the way it came */ if (port == frame->port_rcv) continue; @@ -257,32 +429,49 @@ static void hsr_forward_do(struct hsr_frame_info *frame) if (port->type != HSR_PT_MASTER && frame->is_local_exclusive) continue; - /* Don't send frame over port where it has been sent before */ - if (hsr_register_frame_out(port, frame->node_src, + /* If hardware duplicate generation is enabled, only send out + * one port. + */ + if ((port->dev->features & NETIF_F_HW_HSR_DUP) && sent) + continue; + + /* Don't send frame over port where it has been sent before. + * Also fro SAN, this shouldn't be done. + */ + if (!frame->is_from_san && + hsr_register_frame_out(port, frame->node_src, frame->sequence_nr)) continue; if (frame->is_supervision && port->type == HSR_PT_MASTER) { - hsr_handle_sup_frame(frame->skb_hsr, - frame->node_src, - frame->port_rcv); + hsr_handle_sup_frame(frame); continue; } + /* Check if frame is to be dropped. Eg. for PRP no forward + * between ports. + */ + if (hsr->proto_ops->drop_frame && + hsr->proto_ops->drop_frame(frame, port)) + continue; + if (port->type != HSR_PT_MASTER) - skb = frame_get_tagged_skb(frame, port); + skb = hsr->proto_ops->create_tagged_frame(frame, port); else - skb = frame_get_stripped_skb(frame, port); + skb = hsr->proto_ops->get_untagged_frame(frame, port); + if (!skb) { - /* FIXME: Record the dropped frame? */ + frame->port_rcv->dev->stats.rx_dropped++; continue; } skb->dev = port->dev; - if (port->type == HSR_PT_MASTER) + if (port->type == HSR_PT_MASTER) { hsr_deliver_master(skb, port->dev, frame->node_src); - else - hsr_xmit(skb, port, frame); + } else { + if (!hsr_xmit(skb, port, frame)) + sent = true; + } } } @@ -305,40 +494,118 @@ static void check_local_dest(struct hsr_priv *hsr, struct sk_buff *skb, } } -static int hsr_fill_frame_info(struct hsr_frame_info *frame, - struct sk_buff *skb, struct hsr_port *port) +static void handle_std_frame(struct sk_buff *skb, + struct hsr_frame_info *frame) { - struct ethhdr *ethhdr; + struct hsr_port *port = frame->port_rcv; + struct hsr_priv *hsr = port->hsr; unsigned long irqflags; + frame->skb_hsr = NULL; + frame->skb_prp = NULL; + frame->skb_std = skb; + + if (port->type != HSR_PT_MASTER) { + frame->is_from_san = true; + } else { + /* Sequence nr for the master node */ + spin_lock_irqsave(&hsr->seqnr_lock, irqflags); + frame->sequence_nr = hsr->sequence_nr; + hsr->sequence_nr++; + spin_unlock_irqrestore(&hsr->seqnr_lock, irqflags); + } +} + +int hsr_fill_frame_info(__be16 proto, struct sk_buff *skb, + struct hsr_frame_info *frame) +{ + struct hsr_port *port = frame->port_rcv; + struct hsr_priv *hsr = port->hsr; + + /* HSRv0 supervisory frames double as a tag so treat them as tagged. */ + if ((!hsr->prot_version && proto == htons(ETH_P_PRP)) || + proto == htons(ETH_P_HSR)) { + /* Check if skb contains hsr_ethhdr */ + if (skb->mac_len < sizeof(struct hsr_ethhdr)) + return -EINVAL; + + /* HSR tagged frame :- Data or Supervision */ + frame->skb_std = NULL; + frame->skb_prp = NULL; + frame->skb_hsr = skb; + frame->sequence_nr = hsr_get_skb_sequence_nr(skb); + return 0; + } + + /* Standard frame or PRP from master port */ + handle_std_frame(skb, frame); + + return 0; +} + +int prp_fill_frame_info(__be16 proto, struct sk_buff *skb, + struct hsr_frame_info *frame) +{ + /* Supervision frame */ + struct prp_rct *rct = skb_get_PRP_rct(skb); + + if (rct && + prp_check_lsdu_size(skb, rct, frame->is_supervision)) { + frame->skb_hsr = NULL; + frame->skb_std = NULL; + frame->skb_prp = skb; + frame->sequence_nr = prp_get_skb_sequence_nr(rct); + return 0; + } + handle_std_frame(skb, frame); + + return 0; +} + +static int fill_frame_info(struct hsr_frame_info *frame, + struct sk_buff *skb, struct hsr_port *port) +{ + struct hsr_priv *hsr = port->hsr; + struct hsr_vlan_ethhdr *vlan_hdr; + struct ethhdr *ethhdr; + __be16 proto; + int ret; + u32 hash; + + /* Check if skb contains ethhdr */ + if (skb->mac_len < sizeof(struct ethhdr)) + return -EINVAL; + + memset(frame, 0, sizeof(*frame)); + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + hash = hsr_mac_hash(port->hsr, ethhdr->h_source); frame->is_supervision = is_supervision_frame(port->hsr, skb); - frame->node_src = hsr_get_node(port, skb, frame->is_supervision); + frame->node_src = hsr_get_node(port, &hsr->node_db[hash], 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; - if (ethhdr->h_proto == htons(ETH_P_8021Q)) { + 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: */ - WARN_ONCE(1, "HSR: VLAN not yet supported"); - } - if (ethhdr->h_proto == htons(ETH_P_PRP) || - ethhdr->h_proto == htons(ETH_P_HSR)) { - frame->skb_std = NULL; - frame->skb_hsr = skb; - frame->sequence_nr = hsr_get_skb_sequence_nr(skb); - } else { - frame->skb_std = skb; - frame->skb_hsr = NULL; - /* Sequence nr for the master node */ - spin_lock_irqsave(&port->hsr->seqnr_lock, irqflags); - frame->sequence_nr = port->hsr->sequence_nr; - port->hsr->sequence_nr++; - spin_unlock_irqrestore(&port->hsr->seqnr_lock, irqflags); + 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; @@ -349,14 +616,9 @@ void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port) { struct hsr_frame_info frame; - if (skb_mac_header(skb) != skb->data) { - WARN_ONCE(1, "%s:%d: Malformed frame (port_src %s)\n", - __FILE__, __LINE__, port->dev->name); + if (fill_frame_info(&frame, skb, port) < 0) goto out_drop; - } - if (hsr_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. @@ -367,10 +629,9 @@ void hsr_forward_skb(struct sk_buff *skb, struct hsr_port *port) port->dev->stats.tx_bytes += skb->len; } - if (frame.skb_hsr) - kfree_skb(frame.skb_hsr); - if (frame.skb_std) - kfree_skb(frame.skb_std); + kfree_skb(frame.skb_hsr); + kfree_skb(frame.skb_prp); + kfree_skb(frame.skb_std); return; out_drop: |