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authorLinus Lüssing <linus.luessing@c0d3.blue>2023-09-07 04:09:08 +0300
committerSimon Wunderlich <sw@simonwunderlich.de>2023-11-14 10:16:34 +0300
commit07afe1ba288c04280622fa002ed385f1ac0b6fe6 (patch)
tree038c9adbac0b7a1e55851fc7665d2fb3d8991628 /net/batman-adv
parente4679a1b8a73584c5774af0fe19bcece94245487 (diff)
downloadlinux-07afe1ba288c04280622fa002ed385f1ac0b6fe6.tar.xz
batman-adv: mcast: implement multicast packet reception and forwarding
Implement functionality to receive and forward a new TVLV capable multicast packet type. The new batman-adv multicast packet type allows to contain several originator destination addresses within a TVLV. Routers on the way will potentially split the batman-adv multicast packet and adjust its tracker TVLV contents. Routing decisions are still based on the selected BATMAN IV or BATMAN V routing algorithm. So this new batman-adv multicast packet type retains the same loop-free properties. Also a new OGM multicast TVLV flag is introduced to signal to other nodes that we are capable of handling a batman-adv multicast packet and multicast tracker TVLV. And that all of our hard interfaces have an MTU of at least 1280 bytes (IPv6 minimum MTU), as a simple solution for now to avoid MTU issues while forwarding. Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/Makefile1
-rw-r--r--net/batman-adv/fragmentation.c8
-rw-r--r--net/batman-adv/main.c2
-rw-r--r--net/batman-adv/multicast.c48
-rw-r--r--net/batman-adv/multicast.h5
-rw-r--r--net/batman-adv/multicast_forw.c239
-rw-r--r--net/batman-adv/originator.c28
-rw-r--r--net/batman-adv/originator.h3
-rw-r--r--net/batman-adv/routing.c70
-rw-r--r--net/batman-adv/routing.h11
-rw-r--r--net/batman-adv/soft-interface.c12
-rw-r--r--net/batman-adv/types.h64
12 files changed, 479 insertions, 12 deletions
diff --git a/net/batman-adv/Makefile b/net/batman-adv/Makefile
index 3bd0760c76a2..b51d8b071b56 100644
--- a/net/batman-adv/Makefile
+++ b/net/batman-adv/Makefile
@@ -20,6 +20,7 @@ batman-adv-y += hash.o
batman-adv-$(CONFIG_BATMAN_ADV_DEBUG) += log.o
batman-adv-y += main.o
batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o
+batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast_forw.o
batman-adv-y += netlink.o
batman-adv-$(CONFIG_BATMAN_ADV_NC) += network-coding.o
batman-adv-y += originator.o
diff --git a/net/batman-adv/fragmentation.c b/net/batman-adv/fragmentation.c
index c120c7c6d25f..757c084ac2d1 100644
--- a/net/batman-adv/fragmentation.c
+++ b/net/batman-adv/fragmentation.c
@@ -25,7 +25,6 @@
#include "hard-interface.h"
#include "originator.h"
-#include "routing.h"
#include "send.h"
/**
@@ -351,18 +350,14 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
struct batadv_orig_node *orig_node_src)
{
struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
- struct batadv_orig_node *orig_node_dst;
struct batadv_neigh_node *neigh_node = NULL;
struct batadv_frag_packet *packet;
u16 total_size;
bool ret = false;
packet = (struct batadv_frag_packet *)skb->data;
- orig_node_dst = batadv_orig_hash_find(bat_priv, packet->dest);
- if (!orig_node_dst)
- goto out;
- neigh_node = batadv_find_router(bat_priv, orig_node_dst, recv_if);
+ neigh_node = batadv_orig_to_router(bat_priv, packet->dest, recv_if);
if (!neigh_node)
goto out;
@@ -381,7 +376,6 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
}
out:
- batadv_orig_node_put(orig_node_dst);
batadv_neigh_node_put(neigh_node);
return ret;
}
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c
index e8a449915566..50b2bf2b748c 100644
--- a/net/batman-adv/main.c
+++ b/net/batman-adv/main.c
@@ -532,6 +532,8 @@ static void batadv_recv_handler_init(void)
/* broadcast packet */
batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet;
+ /* multicast packet */
+ batadv_rx_handler[BATADV_MCAST] = batadv_recv_mcast_packet;
/* unicast packets ... */
/* unicast with 4 addresses packet */
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 315394f12c55..dfc2c645b13f 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -236,6 +236,37 @@ static u8 batadv_mcast_mla_rtr_flags_get(struct batadv_priv *bat_priv,
}
/**
+ * batadv_mcast_mla_forw_flags_get() - get multicast forwarding flags
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Checks if all active hard interfaces have an MTU larger or equal to 1280
+ * bytes (IPv6 minimum MTU).
+ *
+ * Return: BATADV_MCAST_HAVE_MC_PTYPE_CAPA if yes, BATADV_NO_FLAGS otherwise.
+ */
+static u8 batadv_mcast_mla_forw_flags_get(struct batadv_priv *bat_priv)
+{
+ const struct batadv_hard_iface *hard_iface;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+ if (hard_iface->if_status != BATADV_IF_ACTIVE)
+ continue;
+
+ if (hard_iface->soft_iface != bat_priv->soft_iface)
+ continue;
+
+ if (hard_iface->net_dev->mtu < IPV6_MIN_MTU) {
+ rcu_read_unlock();
+ return BATADV_NO_FLAGS;
+ }
+ }
+ rcu_read_unlock();
+
+ return BATADV_MCAST_HAVE_MC_PTYPE_CAPA;
+}
+
+/**
* batadv_mcast_mla_flags_get() - get the new multicast flags
* @bat_priv: the bat priv with all the soft interface information
*
@@ -256,6 +287,7 @@ batadv_mcast_mla_flags_get(struct batadv_priv *bat_priv)
mla_flags.enabled = 1;
mla_flags.tvlv_flags |= batadv_mcast_mla_rtr_flags_get(bat_priv,
bridge);
+ mla_flags.tvlv_flags |= batadv_mcast_mla_forw_flags_get(bat_priv);
if (!bridge)
return mla_flags;
@@ -806,23 +838,25 @@ static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
{
bool old_enabled = bat_priv->mcast.mla_flags.enabled;
u8 old_flags = bat_priv->mcast.mla_flags.tvlv_flags;
- char str_old_flags[] = "[.... . ]";
+ char str_old_flags[] = "[.... . .]";
- sprintf(str_old_flags, "[%c%c%c%s%s]",
+ sprintf(str_old_flags, "[%c%c%c%s%s%c]",
(old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
(old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
(old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
!(old_flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
- !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
+ !(old_flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ",
+ !(old_flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA) ? 'P' : '.');
batadv_dbg(BATADV_DBG_MCAST, bat_priv,
- "Changing multicast flags from '%s' to '[%c%c%c%s%s]'\n",
+ "Changing multicast flags from '%s' to '[%c%c%c%s%s%c]'\n",
old_enabled ? str_old_flags : "<undefined>",
(flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
(flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.',
!(flags & BATADV_MCAST_WANT_NO_RTR4) ? "R4" : ". ",
- !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ");
+ !(flags & BATADV_MCAST_WANT_NO_RTR6) ? "R6" : ". ",
+ !(flags & BATADV_MCAST_HAVE_MC_PTYPE_CAPA) ? 'P' : '.');
}
/**
@@ -1820,6 +1854,10 @@ void batadv_mcast_init(struct batadv_priv *bat_priv)
batadv_tvlv_handler_register(bat_priv, batadv_mcast_tvlv_ogm_handler,
NULL, NULL, BATADV_TVLV_MCAST, 2,
BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
+ batadv_tvlv_handler_register(bat_priv, NULL, NULL,
+ batadv_mcast_forw_tracker_tvlv_handler,
+ BATADV_TVLV_MCAST_TRACKER, 1,
+ BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
INIT_DELAYED_WORK(&bat_priv->mcast.work, batadv_mcast_mla_update);
batadv_mcast_start_timer(bat_priv);
diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h
index a9770d8d6d36..a5c0f384bb9a 100644
--- a/net/batman-adv/multicast.h
+++ b/net/batman-adv/multicast.h
@@ -52,6 +52,11 @@ void batadv_mcast_free(struct batadv_priv *bat_priv);
void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
+/* multicast_forw.c */
+
+int batadv_mcast_forw_tracker_tvlv_handler(struct batadv_priv *bat_priv,
+ struct sk_buff *skb);
+
#else
static inline enum batadv_forw_mode
diff --git a/net/batman-adv/multicast_forw.c b/net/batman-adv/multicast_forw.c
new file mode 100644
index 000000000000..d17341dfb832
--- /dev/null
+++ b/net/batman-adv/multicast_forw.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) B.A.T.M.A.N. contributors:
+ *
+ * Linus Lüssing
+ */
+
+#include "multicast.h"
+#include "main.h"
+
+#include <linux/byteorder/generic.h>
+#include <linux/errno.h>
+#include <linux/etherdevice.h>
+#include <linux/gfp.h>
+#include <linux/if_ether.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <uapi/linux/batadv_packet.h>
+
+#include "originator.h"
+#include "send.h"
+
+#define batadv_mcast_forw_tracker_for_each_dest(dest, num_dests) \
+ for (; num_dests; num_dests--, (dest) += ETH_ALEN)
+
+#define batadv_mcast_forw_tracker_for_each_dest2(dest1, dest2, num_dests) \
+ for (; num_dests; num_dests--, (dest1) += ETH_ALEN, (dest2) += ETH_ALEN)
+
+/**
+ * batadv_mcast_forw_scrub_dests() - scrub destinations in a tracker TVLV
+ * @bat_priv: the bat priv with all the soft interface information
+ * @comp_neigh: next hop neighbor to scrub+collect destinations for
+ * @dest: start MAC entry in original skb's tracker TVLV
+ * @next_dest: start MAC entry in to be sent skb's tracker TVLV
+ * @num_dests: number of remaining destination MAC entries to iterate over
+ *
+ * This sorts destination entries into either the original batman-adv
+ * multicast packet or the skb (copy) that is going to be sent to comp_neigh
+ * next.
+ *
+ * In preparation for the next, to be (unicast) transmitted batman-adv multicast
+ * packet skb to be sent to the given neighbor node, tries to collect all
+ * originator MAC addresses that have the given neighbor node as their next hop
+ * in the to be transmitted skb (copy), which next_dest points into. That is we
+ * zero all destination entries in next_dest which do not have comp_neigh as
+ * their next hop. And zero all destination entries in the original skb that
+ * would have comp_neigh as their next hop (to avoid redundant transmissions and
+ * duplicated payload later).
+ */
+static void
+batadv_mcast_forw_scrub_dests(struct batadv_priv *bat_priv,
+ struct batadv_neigh_node *comp_neigh, u8 *dest,
+ u8 *next_dest, u16 num_dests)
+{
+ struct batadv_neigh_node *next_neigh;
+
+ /* skip first entry, this is what we are comparing with */
+ eth_zero_addr(dest);
+ dest += ETH_ALEN;
+ next_dest += ETH_ALEN;
+ num_dests--;
+
+ batadv_mcast_forw_tracker_for_each_dest2(dest, next_dest, num_dests) {
+ if (is_zero_ether_addr(next_dest))
+ continue;
+
+ /* sanity check, we expect unicast destinations */
+ if (is_multicast_ether_addr(next_dest)) {
+ eth_zero_addr(dest);
+ eth_zero_addr(next_dest);
+ continue;
+ }
+
+ next_neigh = batadv_orig_to_router(bat_priv, next_dest, NULL);
+ if (!next_neigh) {
+ eth_zero_addr(next_dest);
+ continue;
+ }
+
+ if (!batadv_compare_eth(next_neigh->addr, comp_neigh->addr)) {
+ eth_zero_addr(next_dest);
+ batadv_neigh_node_put(next_neigh);
+ continue;
+ }
+
+ /* found an entry for our next packet to transmit, so remove it
+ * from the original packet
+ */
+ eth_zero_addr(dest);
+ batadv_neigh_node_put(next_neigh);
+ }
+}
+
+/**
+ * batadv_mcast_forw_packet() - forward a batman-adv multicast packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the received or locally generated batman-adv multicast packet
+ * @local_xmit: indicates that the packet was locally generated and not received
+ *
+ * Parses the tracker TVLV of a batman-adv multicast packet and forwards the
+ * packet as indicated in this TVLV.
+ *
+ * Caller needs to set the skb network header to the start of the multicast
+ * tracker TVLV (excluding the generic TVLV header) and the skb transport header
+ * to the next byte after this multicast tracker TVLV.
+ *
+ * Caller needs to free the skb.
+ *
+ * Return: NET_RX_SUCCESS or NET_RX_DROP on success or a negative error
+ * code on failure. NET_RX_SUCCESS if the received packet is supposed to be
+ * decapsulated and forwarded to the own soft interface, NET_RX_DROP otherwise.
+ */
+static int batadv_mcast_forw_packet(struct batadv_priv *bat_priv,
+ struct sk_buff *skb, bool local_xmit)
+{
+ struct batadv_tvlv_mcast_tracker *mcast_tracker;
+ struct batadv_neigh_node *neigh_node;
+ unsigned long offset, num_dests_off;
+ struct sk_buff *nexthop_skb;
+ unsigned char *skb_net_hdr;
+ bool local_recv = false;
+ unsigned int tvlv_len;
+ bool xmitted = false;
+ u8 *dest, *next_dest;
+ u16 num_dests;
+ int ret;
+
+ /* (at least) TVLV part needs to be linearized */
+ SKB_LINEAR_ASSERT(skb);
+
+ /* check if num_dests is within skb length */
+ num_dests_off = offsetof(struct batadv_tvlv_mcast_tracker, num_dests);
+ if (num_dests_off > skb_network_header_len(skb))
+ return -EINVAL;
+
+ skb_net_hdr = skb_network_header(skb);
+ mcast_tracker = (struct batadv_tvlv_mcast_tracker *)skb_net_hdr;
+ num_dests = ntohs(mcast_tracker->num_dests);
+
+ dest = (u8 *)mcast_tracker + sizeof(*mcast_tracker);
+
+ /* check if full tracker tvlv is within skb length */
+ tvlv_len = sizeof(*mcast_tracker) + ETH_ALEN * num_dests;
+ if (tvlv_len > skb_network_header_len(skb))
+ return -EINVAL;
+
+ /* invalidate checksum: */
+ skb->ip_summed = CHECKSUM_NONE;
+
+ batadv_mcast_forw_tracker_for_each_dest(dest, num_dests) {
+ if (is_zero_ether_addr(dest))
+ continue;
+
+ /* only unicast originator addresses supported */
+ if (is_multicast_ether_addr(dest)) {
+ eth_zero_addr(dest);
+ continue;
+ }
+
+ if (batadv_is_my_mac(bat_priv, dest)) {
+ eth_zero_addr(dest);
+ local_recv = true;
+ continue;
+ }
+
+ neigh_node = batadv_orig_to_router(bat_priv, dest, NULL);
+ if (!neigh_node) {
+ eth_zero_addr(dest);
+ continue;
+ }
+
+ nexthop_skb = skb_copy(skb, GFP_ATOMIC);
+ if (!nexthop_skb) {
+ batadv_neigh_node_put(neigh_node);
+ return -ENOMEM;
+ }
+
+ offset = dest - skb->data;
+ next_dest = nexthop_skb->data + offset;
+
+ batadv_mcast_forw_scrub_dests(bat_priv, neigh_node, dest,
+ next_dest, num_dests);
+
+ batadv_inc_counter(bat_priv, BATADV_CNT_MCAST_TX);
+ batadv_add_counter(bat_priv, BATADV_CNT_MCAST_TX_BYTES,
+ nexthop_skb->len + ETH_HLEN);
+ xmitted = true;
+ ret = batadv_send_unicast_skb(nexthop_skb, neigh_node);
+
+ batadv_neigh_node_put(neigh_node);
+
+ if (ret < 0)
+ return ret;
+ }
+
+ if (xmitted) {
+ if (local_xmit) {
+ batadv_inc_counter(bat_priv, BATADV_CNT_MCAST_TX_LOCAL);
+ batadv_add_counter(bat_priv,
+ BATADV_CNT_MCAST_TX_LOCAL_BYTES,
+ skb->len -
+ skb_transport_offset(skb));
+ } else {
+ batadv_inc_counter(bat_priv, BATADV_CNT_MCAST_FWD);
+ batadv_add_counter(bat_priv, BATADV_CNT_MCAST_FWD_BYTES,
+ skb->len + ETH_HLEN);
+ }
+ }
+
+ if (local_recv)
+ return NET_RX_SUCCESS;
+ else
+ return NET_RX_DROP;
+}
+
+/**
+ * batadv_mcast_forw_tracker_tvlv_handler() - handle an mcast tracker tvlv
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the received batman-adv multicast packet
+ *
+ * Parses the tracker TVLV of an incoming batman-adv multicast packet and
+ * forwards the packet as indicated in this TVLV.
+ *
+ * Caller needs to set the skb network header to the start of the multicast
+ * tracker TVLV (excluding the generic TVLV header) and the skb transport header
+ * to the next byte after this multicast tracker TVLV.
+ *
+ * Caller needs to free the skb.
+ *
+ * Return: NET_RX_SUCCESS or NET_RX_DROP on success or a negative error
+ * code on failure. NET_RX_SUCCESS if the received packet is supposed to be
+ * decapsulated and forwarded to the own soft interface, NET_RX_DROP otherwise.
+ */
+int batadv_mcast_forw_tracker_tvlv_handler(struct batadv_priv *bat_priv,
+ struct sk_buff *skb)
+{
+ return batadv_mcast_forw_packet(bat_priv, skb, false);
+}
diff --git a/net/batman-adv/originator.c b/net/batman-adv/originator.c
index 34903df4fe93..71c143d4b6d0 100644
--- a/net/batman-adv/originator.c
+++ b/net/batman-adv/originator.c
@@ -312,6 +312,33 @@ batadv_orig_router_get(struct batadv_orig_node *orig_node,
}
/**
+ * batadv_orig_to_router() - get next hop neighbor to an orig address
+ * @bat_priv: the bat priv with all the soft interface information
+ * @orig_addr: the originator MAC address to search the best next hop router for
+ * @if_outgoing: the interface where the payload packet has been received or
+ * the OGM should be sent to
+ *
+ * Return: A neighbor node which is the best router towards the given originator
+ * address.
+ */
+struct batadv_neigh_node *
+batadv_orig_to_router(struct batadv_priv *bat_priv, u8 *orig_addr,
+ struct batadv_hard_iface *if_outgoing)
+{
+ struct batadv_neigh_node *neigh_node;
+ struct batadv_orig_node *orig_node;
+
+ orig_node = batadv_orig_hash_find(bat_priv, orig_addr);
+ if (!orig_node)
+ return NULL;
+
+ neigh_node = batadv_find_router(bat_priv, orig_node, if_outgoing);
+ batadv_orig_node_put(orig_node);
+
+ return neigh_node;
+}
+
+/**
* batadv_orig_ifinfo_get() - find the ifinfo from an orig_node
* @orig_node: the orig node to be queried
* @if_outgoing: the interface for which the ifinfo should be acquired
@@ -942,6 +969,7 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
#ifdef CONFIG_BATMAN_ADV_MCAST
orig_node->mcast_flags = BATADV_MCAST_WANT_NO_RTR4;
orig_node->mcast_flags |= BATADV_MCAST_WANT_NO_RTR6;
+ orig_node->mcast_flags |= BATADV_MCAST_HAVE_MC_PTYPE_CAPA;
INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node);
INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node);
INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node);
diff --git a/net/batman-adv/originator.h b/net/batman-adv/originator.h
index ea3d69e4e670..db0c55128170 100644
--- a/net/batman-adv/originator.h
+++ b/net/batman-adv/originator.h
@@ -36,6 +36,9 @@ void batadv_neigh_node_release(struct kref *ref);
struct batadv_neigh_node *
batadv_orig_router_get(struct batadv_orig_node *orig_node,
const struct batadv_hard_iface *if_outgoing);
+struct batadv_neigh_node *
+batadv_orig_to_router(struct batadv_priv *bat_priv, u8 *orig_addr,
+ struct batadv_hard_iface *if_outgoing);
struct batadv_neigh_ifinfo *
batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh,
struct batadv_hard_iface *if_outgoing);
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c
index 163cd43c4821..f1061985149f 100644
--- a/net/batman-adv/routing.c
+++ b/net/batman-adv/routing.c
@@ -1270,3 +1270,73 @@ out:
batadv_orig_node_put(orig_node);
return ret;
}
+
+#ifdef CONFIG_BATMAN_ADV_MCAST
+/**
+ * batadv_recv_mcast_packet() - process received batman-adv multicast packet
+ * @skb: the received batman-adv multicast packet
+ * @recv_if: interface that the skb is received on
+ *
+ * Parses the given, received batman-adv multicast packet. Depending on the
+ * contents of its TVLV forwards it and/or decapsulates it to hand it to the
+ * soft interface.
+ *
+ * Return: NET_RX_DROP if the skb is not consumed, NET_RX_SUCCESS otherwise.
+ */
+int batadv_recv_mcast_packet(struct sk_buff *skb,
+ struct batadv_hard_iface *recv_if)
+{
+ struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface);
+ struct batadv_mcast_packet *mcast_packet;
+ int hdr_size = sizeof(*mcast_packet);
+ unsigned char *tvlv_buff;
+ int ret = NET_RX_DROP;
+ u16 tvlv_buff_len;
+
+ if (batadv_check_unicast_packet(bat_priv, skb, hdr_size) < 0)
+ goto free_skb;
+
+ /* create a copy of the skb, if needed, to modify it. */
+ if (skb_cow(skb, ETH_HLEN) < 0)
+ goto free_skb;
+
+ /* packet needs to be linearized to access the tvlv content */
+ if (skb_linearize(skb) < 0)
+ goto free_skb;
+
+ mcast_packet = (struct batadv_mcast_packet *)skb->data;
+ if (mcast_packet->ttl-- < 2)
+ goto free_skb;
+
+ tvlv_buff = (unsigned char *)(skb->data + hdr_size);
+ tvlv_buff_len = ntohs(mcast_packet->tvlv_len);
+
+ if (tvlv_buff_len > skb->len - hdr_size)
+ goto free_skb;
+
+ ret = batadv_tvlv_containers_process(bat_priv, BATADV_MCAST, NULL, skb,
+ tvlv_buff, tvlv_buff_len);
+ if (ret >= 0) {
+ batadv_inc_counter(bat_priv, BATADV_CNT_MCAST_RX);
+ batadv_add_counter(bat_priv, BATADV_CNT_MCAST_RX_BYTES,
+ skb->len + ETH_HLEN);
+ }
+
+ hdr_size += tvlv_buff_len;
+
+ if (ret == NET_RX_SUCCESS && (skb->len - hdr_size >= ETH_HLEN)) {
+ batadv_inc_counter(bat_priv, BATADV_CNT_MCAST_RX_LOCAL);
+ batadv_add_counter(bat_priv, BATADV_CNT_MCAST_RX_LOCAL_BYTES,
+ skb->len - hdr_size);
+
+ batadv_interface_rx(bat_priv->soft_iface, skb, hdr_size, NULL);
+ /* skb was consumed */
+ skb = NULL;
+ }
+
+free_skb:
+ kfree_skb(skb);
+
+ return ret;
+}
+#endif /* CONFIG_BATMAN_ADV_MCAST */
diff --git a/net/batman-adv/routing.h b/net/batman-adv/routing.h
index afd15b3879f1..e9849f032a24 100644
--- a/net/batman-adv/routing.h
+++ b/net/batman-adv/routing.h
@@ -27,6 +27,17 @@ int batadv_recv_frag_packet(struct sk_buff *skb,
struct batadv_hard_iface *iface);
int batadv_recv_bcast_packet(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+int batadv_recv_mcast_packet(struct sk_buff *skb,
+ struct batadv_hard_iface *recv_if);
+#else
+static inline int batadv_recv_mcast_packet(struct sk_buff *skb,
+ struct batadv_hard_iface *recv_if)
+{
+ kfree_skb(skb);
+ return NET_RX_DROP;
+}
+#endif
int batadv_recv_unicast_tvlv(struct sk_buff *skb,
struct batadv_hard_iface *recv_if);
int batadv_recv_unhandled_unicast_packet(struct sk_buff *skb,
diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
index 1bf1232a4f75..1b0e2c59aef2 100644
--- a/net/batman-adv/soft-interface.c
+++ b/net/batman-adv/soft-interface.c
@@ -925,6 +925,18 @@ static const struct {
{ "tt_response_rx" },
{ "tt_roam_adv_tx" },
{ "tt_roam_adv_rx" },
+#ifdef CONFIG_BATMAN_ADV_MCAST
+ { "mcast_tx" },
+ { "mcast_tx_bytes" },
+ { "mcast_tx_local" },
+ { "mcast_tx_local_bytes" },
+ { "mcast_rx" },
+ { "mcast_rx_bytes" },
+ { "mcast_rx_local" },
+ { "mcast_rx_local_bytes" },
+ { "mcast_fwd" },
+ { "mcast_fwd_bytes" },
+#endif
#ifdef CONFIG_BATMAN_ADV_DAT
{ "dat_get_tx" },
{ "dat_get_rx" },
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index 17d5ea1d8e84..850b184e5b04 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -862,6 +862,70 @@ enum batadv_counters {
*/
BATADV_CNT_TT_ROAM_ADV_RX,
+#ifdef CONFIG_BATMAN_ADV_MCAST
+ /**
+ * @BATADV_CNT_MCAST_TX: transmitted batman-adv multicast packets
+ * counter
+ */
+ BATADV_CNT_MCAST_TX,
+
+ /**
+ * @BATADV_CNT_MCAST_TX_BYTES: transmitted batman-adv multicast packets
+ * bytes counter
+ */
+ BATADV_CNT_MCAST_TX_BYTES,
+
+ /**
+ * @BATADV_CNT_MCAST_TX_LOCAL: counter for multicast packets which
+ * were locally encapsulated and transmitted as batman-adv multicast
+ * packets
+ */
+ BATADV_CNT_MCAST_TX_LOCAL,
+
+ /**
+ * @BATADV_CNT_MCAST_TX_LOCAL_BYTES: bytes counter for multicast packets
+ * which were locally encapsulated and transmitted as batman-adv
+ * multicast packets
+ */
+ BATADV_CNT_MCAST_TX_LOCAL_BYTES,
+
+ /**
+ * @BATADV_CNT_MCAST_RX: received batman-adv multicast packet counter
+ */
+ BATADV_CNT_MCAST_RX,
+
+ /**
+ * @BATADV_CNT_MCAST_RX_BYTES: received batman-adv multicast packet
+ * bytes counter
+ */
+ BATADV_CNT_MCAST_RX_BYTES,
+
+ /**
+ * @BATADV_CNT_MCAST_RX_LOCAL: counter for received batman-adv multicast
+ * packets which were forwarded to the local soft interface
+ */
+ BATADV_CNT_MCAST_RX_LOCAL,
+
+ /**
+ * @BATADV_CNT_MCAST_RX_LOCAL_BYTES: bytes counter for received
+ * batman-adv multicast packets which were forwarded to the local soft
+ * interface
+ */
+ BATADV_CNT_MCAST_RX_LOCAL_BYTES,
+
+ /**
+ * @BATADV_CNT_MCAST_FWD: counter for received batman-adv multicast
+ * packets which were forwarded to other, neighboring nodes
+ */
+ BATADV_CNT_MCAST_FWD,
+
+ /**
+ * @BATADV_CNT_MCAST_FWD_BYTES: bytes counter for received batman-adv
+ * multicast packets which were forwarded to other, neighboring nodes
+ */
+ BATADV_CNT_MCAST_FWD_BYTES,
+#endif
+
#ifdef CONFIG_BATMAN_ADV_DAT
/**
* @BATADV_CNT_DAT_GET_TX: transmitted dht GET traffic packet counter