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authorBenjamin Brahmer <info@b-brahmer.de>2021-02-02 16:59:45 +0100
committerBenjamin Brahmer <info@b-brahmer.de>2021-02-02 17:39:21 +0100
commitac4a42cb2a0c57fe4086ef78292ce63118dcee7f (patch)
treef8444804a6c40e9c19268b6c4c31f7d0209851fe /l10n/es_UY.js
parent66b4005b5ee832410742ee8ca3f07031dee38189 (diff)
Release 15.2.015.2.0
Changed You can now delete unread items via occ: occ news:updater:after-update --purge-unread [<purge-count>] Fixed - Item purger does not work with PostgreSQL (#1094) - Export starred/unread correctly (#1010) Co-authored-by: anoy. <anoymouserver@users.noreply.github.com> Signed-off-by: Benjamin Brahmer <info@b-brahmer.de>
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generated by cgit v1.2.3 (git 2.25.1) at 2024-09-06 23:49:39 +0000
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/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 *
 * The HSR spec says never to forward the same frame twice on the same
 * interface. A frame is identified by its source MAC address and its HSR
 * sequence number. This code keeps track of senders and their sequence numbers
 * to allow filtering of duplicate frames, and to detect HSR ring errors.
 */

#include <linux/if_ether.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/rculist.h>
#include "hsr_main.h"
#include "hsr_framereg.h"
#include "hsr_netlink.h"


struct hsr_node {
	struct list_head	mac_list;
	unsigned char		MacAddressA[ETH_ALEN];
	unsigned char		MacAddressB[ETH_ALEN];
	/* Local slave through which AddrB frames are received from this node */
	enum hsr_port_type	AddrB_port;
	unsigned long		time_in[HSR_PT_PORTS];
	bool			time_in_stale[HSR_PT_PORTS];
	u16			seq_out[HSR_PT_PORTS];
	struct rcu_head		rcu_head;
};


/*	TODO: use hash lists for mac addresses (linux/jhash.h)?    */


/* seq_nr_after(a, b) - return true if a is after (higher in sequence than) b,
 * false otherwise.
 */
static bool seq_nr_after(u16 a, u16 b)
{
	/* Remove inconsistency where
	 * seq_nr_after(a, b) == seq_nr_before(a, b)
	 */
	if ((int) b - a == 32768)
		return false;

	return (((s16) (b - a)) < 0);
}
#define seq_nr_before(a, b)		seq_nr_after((b), (a))
#define seq_nr_after_or_eq(a, b)	(!seq_nr_before((a), (b)))
#define seq_nr_before_or_eq(a, b)	(!seq_nr_after((a), (b)))


bool hsr_addr_is_self(struct hsr_priv *hsr, unsigned char *addr)
{
	struct hsr_node *node;

	node = list_first_or_null_rcu(&hsr->self_node_db, struct hsr_node,
				      mac_list);
	if (!node) {
		WARN_ONCE(1, "HSR: No self node\n");
		return false;
	}

	if (ether_addr_equal(addr, node->MacAddressA))
		return true;
	if (ether_addr_equal(addr, node->MacAddressB))
		return true;

	return false;
}

/* Search for mac entry. Caller must hold rcu read lock.
 */
static struct hsr_node *find_node_by_AddrA(struct list_head *node_db,
					   const unsigned char addr[ETH_ALEN])
{
	struct hsr_node *node;

	list_for_each_entry_rcu(node, node_db, mac_list) {
		if (ether_addr_equal(node->MacAddressA, addr))
			return node;
	}

	return NULL;
}


/* Helper for device init; the self_node_db is used in hsr_rcv() to recognize
 * frames from self that's been looped over the HSR ring.
 */
int hsr_create_self_node(struct list_head *self_node_db,
			 unsigned char addr_a[ETH_ALEN],
			 unsigned char addr_b[ETH_ALEN])
{
	struct hsr_node *node, *oldnode;

	node = kmalloc(sizeof(*node), GFP_KERNEL);
	if (!node)
		return -ENOMEM;

	ether_addr_copy(node->MacAddressA, addr_a);
	ether_addr_copy(node->MacAddressB, addr_b);

	rcu_read_lock();
	oldnode = list_first_or_null_rcu(self_node_db,
						struct hsr_node, mac_list);
	if (oldnode) {
		list_replace_rcu(&oldnode->mac_list, &node->mac_list);
		rcu_read_unlock();
		synchronize_rcu();
		kfree(oldnode);
	} else {
		rcu_read_unlock();
		list_add_tail_rcu(&node->mac_list, self_node_db);
	}

	return 0;
}


/* Allocate an hsr_node and add it to node_db. 'addr' is the node's AddressA;
 * seq_out is used to initialize filtering of outgoing duplicate frames
 * originating from the newly added node.
 */
struct hsr_node *hsr_add_node(struct list_head *node_db, unsigned char addr[],
			      u16 seq_out)
{
	struct hsr_node *node;
	unsigned long now;
	int i;

	node = kzalloc(sizeof(*node), GFP_ATOMIC);
	if (!node)
		return NULL;

	ether_addr_copy(node->MacAddressA, addr);

	/* We are only interested in time diffs here, so use current jiffies
	 * as initialization. (0 could trigger an spurious ring error warning).
	 */
	now = jiffies;
	for (i = 0; i < HSR_PT_PORTS; i++)
		node->time_in[i] = now;
	for (i = 0; i < HSR_PT_PORTS; i++)
		node->seq_out[i] = seq_out;

	list_add_tail_rcu(&node->mac_list, node_db);

	return node;
}

/* Get the hsr_node from which 'skb' was sent.
 */
struct hsr_node *hsr_get_node(struct list_head *node_db, struct sk_buff *skb,
			      bool is_sup)
{
	struct hsr_node *node;
	struct ethhdr *ethhdr;
	u16 seq_out;

	if (!skb_mac_header_was_set(skb))
		return NULL;

	ethhdr = (struct ethhdr *) skb_mac_header(skb);

	list_for_each_entry_rcu(node, node_db, mac_list) {
		if (ether_addr_equal(node->MacAddressA, ethhdr->h_source))
			return node;
		if (ether_addr_equal(node->MacAddressB, ethhdr->h_source))
			return node;
	}

	if (!is_sup)
		return NULL; /* Only supervision frame may create node entry */

	if (ethhdr->h_proto == htons(ETH_P_PRP)) {
		/* Use the existing sequence_nr from the tag as starting point
		 * for filtering duplicate frames.
		 */
		seq_out = hsr_get_skb_sequence_nr(skb) - 1;
	} else {
		WARN_ONCE(1, "%s: Non-HSR frame\n", __func__);
		seq_out = 0;
	}

	return hsr_add_node(node_db, ethhdr->h_source, seq_out);
}

/* Use the Supervision frame's info about an eventual MacAddressB for merging
 * nodes that has previously had their MacAddressB registered as a separate
 * node.
 */
void hsr_handle_sup_frame(struct sk_buff *skb, struct hsr_node *node_curr,
			  struct hsr_port *port_rcv)
{
	struct hsr_node *node_real;
	struct hsr_sup_payload *hsr_sp;
	struct list_head *node_db;
	int i;

	skb_pull(skb, sizeof(struct hsr_ethhdr_sp));
	hsr_sp = (struct hsr_sup_payload *) skb->data;

	if (ether_addr_equal(eth_hdr(skb)->h_source, hsr_sp->MacAddressA))
		/* Not sent from MacAddressB of a PICS_SUBS capable node */
		goto done;

	/* Merge node_curr (registered on MacAddressB) into node_real */
	node_db = &port_rcv->hsr->node_db;
	node_real = find_node_by_AddrA(node_db, hsr_sp->MacAddressA);
	if (!node_real)
		/* No frame received from AddrA of this node yet */
		node_real = hsr_add_node(node_db, hsr_sp->MacAddressA,
					 HSR_SEQNR_START - 1);
	if (!node_real)
		goto done; /* No mem */
	if (node_real == node_curr)
		/* Node has already been merged */
		goto done;

	ether_addr_copy(node_real->MacAddressB, eth_hdr(skb)->h_source);
	for (i = 0; i < HSR_PT_PORTS; i++) {
		if (!node_curr->time_in_stale[i] &&
		    time_after(node_curr->time_in[i], node_real->time_in[i])) {
			node_real->time_in[i] = node_curr->time_in[i];
			node_real->time_in_stale[i] = node_curr->time_in_stale[i];
		}
		if (seq_nr_after(node_curr->seq_out[i], node_real->seq_out[i]))
			node_real->seq_out[i] = node_curr->seq_out[i];
	}
	node_real->AddrB_port = port_rcv->type;

	list_del_rcu(&node_curr->mac_list);
	kfree_rcu(node_curr, rcu_head);

done:
	skb_push(skb, sizeof(struct hsr_ethhdr_sp));
}


/* 'skb' is a frame meant for this host, that is to be passed to upper layers.
 *
 * If the frame was sent by a node's B interface, replace the source
 * address with that node's "official" address (MacAddressA) so that upper
 * layers recognize where it came from.
 */
void hsr_addr_subst_source(struct hsr_node *node, struct sk_buff *skb)
{
	if (!skb_mac_header_was_set(skb)) {
		WARN_ONCE(1, "%s: Mac header not set\n", __func__);
		return;
	}

	memcpy(&eth_hdr(skb)->h_source, node->MacAddressA, ETH_ALEN);
}

/* 'skb' is a frame meant for another host.
 * 'port' is the outgoing interface