B.A.T.M.A.N March 2018

b.a.t.m.a.n@lists.open-mesh.org

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[B.A.T.M.A.N.] [PATCH RFC] batman-adv: always assume 2-byte packet alignment
by Matthias Schiffer 05 Mar '18

05 Mar '18

NIC drivers generally try to ensure that the "network header" is aligned to a 4-byte boundary. This is not always possible: When Ethernet frames are encapsulated in other packets with 4-byte aligned headers, the inner Ethernet header will have 4-byte alignment, and in consequence, the inner network header is aligned to 2, but not to 4 bytes. Most parts of batman-adv only care about 2-byte alignment; in particular, no unaligned accesses occur in performance-critical paths that handle actual payload data. This is not true for OGM handling: the seqno and crc fields are accessed as 32-bit values. To avoid these unaligned accesses, this patch reduces the expected packet alignment to 2 bytes for all of batadv's packet types. As no unaligned accesses existed on the performance-critical paths anyways, this chance does have any (positive or negative) effect on performance, but it still makes sense to avoid these accesses to prevent log noise when examining other unaligned accesses in the kernel while batman-adv is active. Signed-off-by: Matthias Schiffer <mschiffer(a)universe-factory.net> --- include/uapi/linux/batadv_packet.h | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/include/uapi/linux/batadv_packet.h b/include/uapi/linux/batadv_packet.h index daefd728..894d8d2f 100644 --- a/include/uapi/linux/batadv_packet.h +++ b/include/uapi/linux/batadv_packet.h @@ -196,8 +196,6 @@ struct batadv_bla_claim_dst { __be16 group; /* group id */ }; -#pragma pack() - /** * struct batadv_ogm_packet - ogm (routing protocol) packet * @packet_type: batman-adv packet type, part of the general header @@ -222,9 +220,6 @@ struct batadv_ogm_packet { __u8 reserved; __u8 tq; __be16 tvlv_len; - /* __packed is not needed as the struct size is divisible by 4, - * and the largest data type in this struct has a size of 4. - */ }; #define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet) @@ -249,9 +244,6 @@ struct batadv_ogm2_packet { __u8 orig[ETH_ALEN]; __be16 tvlv_len; __be32 throughput; - /* __packed is not needed as the struct size is divisible by 4, - * and the largest data type in this struct has a size of 4. - */ }; #define BATADV_OGM2_HLEN sizeof(struct batadv_ogm2_packet) @@ -405,7 +397,6 @@ struct batadv_icmp_packet_rr { * misalignment of the payload after the ethernet header. It may also lead to * leakage of information when the padding it not initialized before sending. */ -#pragma pack(2) /** * struct batadv_unicast_packet - unicast packet for network payload @@ -533,8 +524,6 @@ struct batadv_coded_packet { __be16 coded_len; }; -#pragma pack() - /** * struct batadv_unicast_tvlv_packet - generic unicast packet with tvlv payload * @packet_type: batman-adv packet type, part of the general header @@ -641,4 +630,6 @@ struct batadv_tvlv_mcast_data { __u8 reserved[3]; }; +#pragma pack() + #endif /* _UAPI_LINUX_BATADV_PACKET_H_ */ -- 2.16.1

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[B.A.T.M.A.N.] [PATCH 0/5] pull request for net-next: batman-adv 2018-03-02
by Simon Wunderlich 04 Mar '18

04 Mar '18

Hi David, here is a little cleanup pull request of batman-adv to go into net-next. Please pull or let me know of any problem! Thank you, Simon The following changes since commit 7928b2cbe55b2a410a0f5c1f154610059c57b1b2: Linux 4.16-rc1 (2018-02-11 15:04:29 -0800) are available in the git repository at: git://git.open-mesh.org/linux-merge.git tags/batadv-next-for-davem-20180302 for you to fetch changes up to a163dc22d515d17844435c8217ff66193d35b3fa: batman-adv: always assume 2-byte packet alignment (2018-02-27 13:02:54 +0100) ---------------------------------------------------------------- This cleanup patchset includes the following patches: - bump version strings, by Simon Wunderlich - bump copyright years, by Sven Eckelmann - fix macro indendation for checkpatch, by Sven Eckelmann - fix comparison operator for bool returning functions, by Sven Eckelmann - assume 2-byte packet alignments for all packet types, by Matthias Schiffer ---------------------------------------------------------------- Matthias Schiffer (1): batman-adv: always assume 2-byte packet alignment Simon Wunderlich (1): batman-adv: Start new development cycle Sven Eckelmann (3): batman-adv: Update copyright years for 2018 batman-adv: Fix indentation of batadv_seq_before batman-adv: Avoid relation operator comparison with bool include/uapi/linux/batadv_packet.h | 15 +++------------ include/uapi/linux/batman_adv.h | 2 +- net/batman-adv/Kconfig | 2 +- net/batman-adv/Makefile | 2 +- net/batman-adv/bat_algo.c | 2 +- net/batman-adv/bat_algo.h | 2 +- net/batman-adv/bat_iv_ogm.c | 2 +- net/batman-adv/bat_iv_ogm.h | 2 +- net/batman-adv/bat_v.c | 2 +- net/batman-adv/bat_v.h | 2 +- net/batman-adv/bat_v_elp.c | 2 +- net/batman-adv/bat_v_elp.h | 2 +- net/batman-adv/bat_v_ogm.c | 2 +- net/batman-adv/bat_v_ogm.h | 2 +- net/batman-adv/bitarray.c | 2 +- net/batman-adv/bitarray.h | 2 +- net/batman-adv/bridge_loop_avoidance.c | 2 +- net/batman-adv/bridge_loop_avoidance.h | 2 +- net/batman-adv/debugfs.c | 2 +- net/batman-adv/debugfs.h | 2 +- net/batman-adv/distributed-arp-table.c | 4 ++-- net/batman-adv/distributed-arp-table.h | 2 +- net/batman-adv/fragmentation.c | 2 +- net/batman-adv/fragmentation.h | 2 +- net/batman-adv/gateway_client.c | 2 +- net/batman-adv/gateway_client.h | 2 +- net/batman-adv/gateway_common.c | 2 +- net/batman-adv/gateway_common.h | 2 +- net/batman-adv/hard-interface.c | 2 +- net/batman-adv/hard-interface.h | 2 +- net/batman-adv/hash.c | 2 +- net/batman-adv/hash.h | 2 +- net/batman-adv/icmp_socket.c | 2 +- net/batman-adv/icmp_socket.h | 2 +- net/batman-adv/log.c | 2 +- net/batman-adv/log.h | 2 +- net/batman-adv/main.c | 2 +- net/batman-adv/main.h | 16 +++++++++------- net/batman-adv/multicast.c | 2 +- net/batman-adv/multicast.h | 2 +- net/batman-adv/netlink.c | 2 +- net/batman-adv/netlink.h | 2 +- net/batman-adv/network-coding.c | 2 +- net/batman-adv/network-coding.h | 2 +- net/batman-adv/originator.c | 2 +- net/batman-adv/originator.h | 2 +- net/batman-adv/routing.c | 2 +- net/batman-adv/routing.h | 2 +- net/batman-adv/send.c | 2 +- net/batman-adv/send.h | 2 +- net/batman-adv/soft-interface.c | 2 +- net/batman-adv/soft-interface.h | 2 +- net/batman-adv/sysfs.c | 2 +- net/batman-adv/sysfs.h | 2 +- net/batman-adv/tp_meter.c | 2 +- net/batman-adv/tp_meter.h | 2 +- net/batman-adv/translation-table.c | 2 +- net/batman-adv/translation-table.h | 2 +- net/batman-adv/tvlv.c | 2 +- net/batman-adv/tvlv.h | 2 +- net/batman-adv/types.h | 2 +- 61 files changed, 72 insertions(+), 79 deletions(-)

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[B.A.T.M.A.N.] [PATCH v3] batman-adv: Avoid redundant multicast TT entries
by Linus Lüssing 04 Mar '18

04 Mar '18

If a node signals that it wants all traffic for a specific protocol family then there is no need to announce individual multicast addresses via TT. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- v3: - use "static const u8 prefix[] =" instead of "const unsigned char prefix[] =" in function body v2: - for consistency use "const u8 *addr" instead of "unsigned char *addr" in function header - for consistency remove some spaces in arrays - use more explicit "memcmp(...) == 0" instead of "!memcmp(...)" --- net/batman-adv/multicast.c | 56 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 52 insertions(+), 4 deletions(-) diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 6eaffe50..c7a1305c 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -102,7 +102,36 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) } /** + * batadv_mcast_addr_is_ipv4() - check if multicast MAC is IPv4 + * @addr: the MAC address to check + * + * Return: True, if MAC address is one reserved for IPv4 multicast, false + * otherwise. + */ +static bool batadv_mcast_addr_is_ipv4(const u8 *addr) +{ + static const u8 prefix[] = {0x01, 0x00, 0x5E}; + + return memcmp(prefix, addr, sizeof(prefix)) == 0; +} + +/** + * batadv_mcast_addr_is_ipv6() - check if multicast MAC is IPv6 + * @addr: the MAC address to check + * + * Return: True, if MAC address is one reserved for IPv6 multicast, false + * otherwise. + */ +static bool batadv_mcast_addr_is_ipv6(const u8 *addr) +{ + static const u8 prefix[] = {0x33, 0x33}; + + return memcmp(prefix, addr, sizeof(prefix)) == 0; +} + +/** * batadv_mcast_mla_softif_get() - get softif multicast listeners + * @bat_priv: the bat priv with all the soft interface information * @dev: the device to collect multicast addresses from * @mcast_list: a list to put found addresses into * @@ -119,9 +148,12 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) * Return: -ENOMEM on memory allocation error or the number of * items added to the mcast_list otherwise. */ -static int batadv_mcast_mla_softif_get(struct net_device *dev, +static int batadv_mcast_mla_softif_get(struct batadv_priv *bat_priv, + struct net_device *dev, struct hlist_head *mcast_list) { + bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; + bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; struct net_device *bridge = batadv_mcast_get_bridge(dev); struct netdev_hw_addr *mc_list_entry; struct batadv_hw_addr *new; @@ -129,6 +161,12 @@ static int batadv_mcast_mla_softif_get(struct net_device *dev, netif_addr_lock_bh(bridge ? bridge : dev); netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { + if (all_ipv4 && batadv_mcast_addr_is_ipv4(mc_list_entry->addr)) + continue; + + if (all_ipv6 && batadv_mcast_addr_is_ipv6(mc_list_entry->addr)) + continue; + new = kmalloc(sizeof(*new), GFP_ATOMIC); if (!new) { ret = -ENOMEM; @@ -193,6 +231,7 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) /** * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners + * @bat_priv: the bat priv with all the soft interface information * @dev: a bridge slave whose bridge to collect multicast addresses from * @mcast_list: a list to put found addresses into * @@ -204,10 +243,13 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) * Return: -ENOMEM on memory allocation error or the number of * items added to the mcast_list otherwise. */ -static int batadv_mcast_mla_bridge_get(struct net_device *dev, +static int batadv_mcast_mla_bridge_get(struct batadv_priv *bat_priv, + struct net_device *dev, struct hlist_head *mcast_list) { struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); + bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; + bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; struct br_ip_list *br_ip_entry, *tmp; struct batadv_hw_addr *new; u8 mcast_addr[ETH_ALEN]; @@ -221,6 +263,12 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev, goto out; list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { + if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP)) + continue; + + if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6)) + continue; + batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) continue; @@ -568,11 +616,11 @@ static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) if (!batadv_mcast_mla_tvlv_update(bat_priv)) goto update; - ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); + ret = batadv_mcast_mla_softif_get(bat_priv, soft_iface, &mcast_list); if (ret < 0) goto out; - ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list); + ret = batadv_mcast_mla_bridge_get(bat_priv, soft_iface, &mcast_list); if (ret < 0) goto out; -- 2.11.0

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[B.A.T.M.A.N.] [PATCH 1/2] batman-adv: add DAT cache netlink support
by Linus Lüssing 04 Mar '18

04 Mar '18

Dump the list of DAT cache entries via the netlink socket. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- include/uapi/linux/batman_adv.h | 20 +++++ net/batman-adv/distributed-arp-table.c | 151 +++++++++++++++++++++++++++++++++ net/batman-adv/distributed-arp-table.h | 7 ++ net/batman-adv/netlink.c | 10 +++ 4 files changed, 188 insertions(+) diff --git a/include/uapi/linux/batman_adv.h b/include/uapi/linux/batman_adv.h index 56ae2893..85c9fe8a 100644 --- a/include/uapi/linux/batman_adv.h +++ b/include/uapi/linux/batman_adv.h @@ -272,6 +272,21 @@ enum batadv_nl_attrs { */ BATADV_ATTR_BLA_CRC, + /** + * @BATADV_ATTR_DC_ADDRESS: Client IPv4 address + */ + BATADV_ATTR_DC_ADDRESS, + + /** + * @BATADV_ATTR_DC_HWADDRESS: Client MAC address + */ + BATADV_ATTR_DC_HWADDRESS, + + /** + * @BATADV_ATTR_DC_VID: VLAN ID + */ + BATADV_ATTR_DC_VID, + /* add attributes above here, update the policy in netlink.c */ /** @@ -361,6 +376,11 @@ enum batadv_nl_commands { */ BATADV_CMD_GET_BLA_BACKBONE, + /** + * @BATADV_CMD_GET_DAT_CACHE: Query list of DAT cache entries + */ + BATADV_CMD_GET_DAT_CACHE, + /* add new commands above here */ /** diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c index 19b15de4..aca34e95 100644 --- a/net/batman-adv/distributed-arp-table.c +++ b/net/batman-adv/distributed-arp-table.c @@ -43,13 +43,18 @@ #include <linux/string.h> #include <linux/workqueue.h> #include <net/arp.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <net/sock.h> #include "bridge_loop_avoidance.h" #include "hard-interface.h" #include "hash.h" #include "log.h" +#include "netlink.h" #include "originator.h" #include "send.h" +#include "soft-interface.h" #include "translation-table.h" #include "tvlv.h" @@ -852,6 +857,152 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) #endif /** + * batadv_dat_cache_dump_entry() - dump one entry of the DAT cache table to a + * netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @seq: Sequence number of netlink message + * @dat_entry: entry to dump + * + * Return: 0 or error code. + */ +static int +batadv_dat_cache_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_dat_entry *dat_entry) +{ + int msecs; + void *hdr; + u32 ip; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, + NLM_F_MULTI, BATADV_CMD_GET_DAT_CACHE); + if (!hdr) + return -ENOBUFS; + + msecs = jiffies_to_msecs(jiffies - dat_entry->last_update); + ip = ntohl(dat_entry->ip); + + if (nla_put_u32(msg, BATADV_ATTR_DC_ADDRESS, ip) || + nla_put(msg, BATADV_ATTR_DC_HWADDRESS, ETH_ALEN, + dat_entry->mac_addr) || + nla_put_u16(msg, BATADV_ATTR_DC_VID, dat_entry->vid) || + nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS, msecs)) { + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; + } + + genlmsg_end(msg, hdr); + return 0; +} + +/** + * batadv_dat_cache_dump_bucket() - dump one bucket of the DAT cache table to + * a netlink socket + * @msg: buffer for the message + * @portid: netlink port + * @seq: Sequence number of netlink message + * @head: bucket to dump + * @idx_skip: How many entries to skip + * + * Return: 0 or error code. + */ +static int +batadv_dat_cache_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq, + struct hlist_head *head, int *idx_skip) +{ + struct batadv_dat_entry *dat_entry; + int idx = 0; + + rcu_read_lock(); + hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { + if (idx < *idx_skip) + goto skip; + + if (batadv_dat_cache_dump_entry(msg, portid, seq, + dat_entry)) { + rcu_read_unlock(); + *idx_skip = idx; + + return -EMSGSIZE; + } + +skip: + idx++; + } + rcu_read_unlock(); + + return 0; +} + +/** + * batadv_dat_cache_dump() - dump DAT cache table to a netlink socket + * @msg: buffer for the message + * @cb: callback structure containing arguments + * + * Return: message length. + */ +int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + struct batadv_hard_iface *primary_if = NULL; + int portid = NETLINK_CB(cb->skb).portid; + struct net *net = sock_net(cb->skb->sk); + struct net_device *soft_iface; + struct batadv_hashtable *hash; + struct batadv_priv *bat_priv; + int bucket = cb->args[0]; + struct hlist_head *head; + int idx = cb->args[1]; + int ifindex; + int ret = 0; + + ifindex = batadv_netlink_get_ifindex(cb->nlh, + BATADV_ATTR_MESH_IFINDEX); + if (!ifindex) + return -EINVAL; + + soft_iface = dev_get_by_index(net, ifindex); + if (!soft_iface || !batadv_softif_is_valid(soft_iface)) { + ret = -ENODEV; + goto out; + } + + bat_priv = netdev_priv(soft_iface); + hash = bat_priv->dat.hash; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { + ret = -ENOENT; + goto out; + } + + while (bucket < hash->size) { + head = &hash->table[bucket]; + + if (batadv_dat_cache_dump_bucket(msg, portid, + cb->nlh->nlmsg_seq, head, + &idx)) + break; + + bucket++; + idx = 0; + } + + cb->args[0] = bucket; + cb->args[1] = idx; + + ret = msg->len; + +out: + if (primary_if) + batadv_hardif_put(primary_if); + + if (soft_iface) + dev_put(soft_iface); + + return ret; +} + +/** * batadv_arp_get_type() - parse an ARP packet and gets the type * @bat_priv: the bat priv with all the soft interface information * @skb: packet to analyse diff --git a/net/batman-adv/distributed-arp-table.h b/net/batman-adv/distributed-arp-table.h index e24aa960..23d11494 100644 --- a/net/batman-adv/distributed-arp-table.h +++ b/net/batman-adv/distributed-arp-table.h @@ -81,6 +81,7 @@ batadv_dat_init_own_addr(struct batadv_priv *bat_priv, int batadv_dat_init(struct batadv_priv *bat_priv); void batadv_dat_free(struct batadv_priv *bat_priv); int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset); +int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb); /** * batadv_dat_inc_counter() - increment the correct DAT packet counter @@ -169,6 +170,12 @@ static inline void batadv_dat_free(struct batadv_priv *bat_priv) { } +static inline int +batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + return -EOPNOTSUPP; +} + static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv, u8 subtype) { diff --git a/net/batman-adv/netlink.c b/net/batman-adv/netlink.c index 129af56b..7812b531 100644 --- a/net/batman-adv/netlink.c +++ b/net/batman-adv/netlink.c @@ -45,6 +45,7 @@ #include "bat_algo.h" #include "bridge_loop_avoidance.h" +#include "distributed-arp-table.h" #include "gateway_client.h" #include "hard-interface.h" #include "originator.h" @@ -97,6 +98,9 @@ static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = { [BATADV_ATTR_BLA_VID] = { .type = NLA_U16 }, [BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN }, [BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 }, + [BATADV_ATTR_DC_ADDRESS] = { .type = NLA_U32 }, + [BATADV_ATTR_DC_HWADDRESS] = { .len = ETH_ALEN }, + [BATADV_ATTR_DC_VID] = { .type = NLA_U16 }, }; /** @@ -604,6 +608,12 @@ static const struct genl_ops batadv_netlink_ops[] = { .policy = batadv_netlink_policy, .dumpit = batadv_bla_backbone_dump, }, + { + .cmd = BATADV_CMD_GET_DAT_CACHE, + .flags = GENL_ADMIN_PERM, + .policy = batadv_netlink_policy, + .dumpit = batadv_dat_cache_dump, + }, }; -- 2.11.0

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[B.A.T.M.A.N.] [PATCH v2] batman-adv: Avoid redundant multicast TT entries
by Linus Lüssing 04 Mar '18

04 Mar '18

If a node signals that it wants all traffic for a specific protocol family then there is no need to announce individual multicast addresses via TT. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- v2: - for consistency use "const u8 *addr" instead of "unsigned char *addr" in function header - for consistency remove some spaces in arrays - use more explicit "memcmp(...) == 0" instead of "!memcmp(...)" --- net/batman-adv/multicast.c | 56 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 52 insertions(+), 4 deletions(-) diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 6eaffe50..7253fae2 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -102,7 +102,36 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) } /** + * batadv_mcast_addr_is_ipv4() - check if multicast MAC is IPv4 + * @addr: the MAC address to check + * + * Return: True, if MAC address is one reserved for IPv4 multicast, false + * otherwise. + */ +static bool batadv_mcast_addr_is_ipv4(const u8 *addr) +{ + const unsigned char prefix[] = {0x01, 0x00, 0x5E}; + + return memcmp(prefix, addr, sizeof(prefix)) == 0; +} + +/** + * batadv_mcast_addr_is_ipv6() - check if multicast MAC is IPv6 + * @addr: the MAC address to check + * + * Return: True, if MAC address is one reserved for IPv6 multicast, false + * otherwise. + */ +static bool batadv_mcast_addr_is_ipv6(const u8 *addr) +{ + const unsigned char prefix[] = {0x33, 0x33}; + + return memcmp(prefix, addr, sizeof(prefix)) == 0; +} + +/** * batadv_mcast_mla_softif_get() - get softif multicast listeners + * @bat_priv: the bat priv with all the soft interface information * @dev: the device to collect multicast addresses from * @mcast_list: a list to put found addresses into * @@ -119,9 +148,12 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) * Return: -ENOMEM on memory allocation error or the number of * items added to the mcast_list otherwise. */ -static int batadv_mcast_mla_softif_get(struct net_device *dev, +static int batadv_mcast_mla_softif_get(struct batadv_priv *bat_priv, + struct net_device *dev, struct hlist_head *mcast_list) { + bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; + bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; struct net_device *bridge = batadv_mcast_get_bridge(dev); struct netdev_hw_addr *mc_list_entry; struct batadv_hw_addr *new; @@ -129,6 +161,12 @@ static int batadv_mcast_mla_softif_get(struct net_device *dev, netif_addr_lock_bh(bridge ? bridge : dev); netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { + if (all_ipv4 && batadv_mcast_addr_is_ipv4(mc_list_entry->addr)) + continue; + + if (all_ipv6 && batadv_mcast_addr_is_ipv6(mc_list_entry->addr)) + continue; + new = kmalloc(sizeof(*new), GFP_ATOMIC); if (!new) { ret = -ENOMEM; @@ -193,6 +231,7 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) /** * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners + * @bat_priv: the bat priv with all the soft interface information * @dev: a bridge slave whose bridge to collect multicast addresses from * @mcast_list: a list to put found addresses into * @@ -204,10 +243,13 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) * Return: -ENOMEM on memory allocation error or the number of * items added to the mcast_list otherwise. */ -static int batadv_mcast_mla_bridge_get(struct net_device *dev, +static int batadv_mcast_mla_bridge_get(struct batadv_priv *bat_priv, + struct net_device *dev, struct hlist_head *mcast_list) { struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); + bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; + bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; struct br_ip_list *br_ip_entry, *tmp; struct batadv_hw_addr *new; u8 mcast_addr[ETH_ALEN]; @@ -221,6 +263,12 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev, goto out; list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { + if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP)) + continue; + + if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6)) + continue; + batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) continue; @@ -568,11 +616,11 @@ static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) if (!batadv_mcast_mla_tvlv_update(bat_priv)) goto update; - ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); + ret = batadv_mcast_mla_softif_get(bat_priv, soft_iface, &mcast_list); if (ret < 0) goto out; - ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list); + ret = batadv_mcast_mla_bridge_get(bat_priv, soft_iface, &mcast_list); if (ret < 0) goto out; -- 2.11.0

2 1

[B.A.T.M.A.N.] [PATCH 1/4] batctl: add DAT cache netlink support
by Linus Lüssing 04 Mar '18

04 Mar '18

Dump the list of DAT cache entries via the netlink socket. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- batman_adv.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/batman_adv.h b/batman_adv.h index 56ae289..85c9fe8 100644 --- a/batman_adv.h +++ b/batman_adv.h @@ -272,6 +272,21 @@ enum batadv_nl_attrs { */ BATADV_ATTR_BLA_CRC, + /** + * @BATADV_ATTR_DC_ADDRESS: Client IPv4 address + */ + BATADV_ATTR_DC_ADDRESS, + + /** + * @BATADV_ATTR_DC_HWADDRESS: Client MAC address + */ + BATADV_ATTR_DC_HWADDRESS, + + /** + * @BATADV_ATTR_DC_VID: VLAN ID + */ + BATADV_ATTR_DC_VID, + /* add attributes above here, update the policy in netlink.c */ /** @@ -361,6 +376,11 @@ enum batadv_nl_commands { */ BATADV_CMD_GET_BLA_BACKBONE, + /** + * @BATADV_CMD_GET_DAT_CACHE: Query list of DAT cache entries + */ + BATADV_CMD_GET_DAT_CACHE, + /* add new commands above here */ /** -- 2.11.0

2 4

[B.A.T.M.A.N.] [PATCH] batman-adv: Avoid redundant multicast TT entries
by Linus Lüssing 04 Mar '18

04 Mar '18

If a node signals that it wants all traffic for a specific protocol family then there is no need to announce individual multicast addresses via TT. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- net/batman-adv/multicast.c | 56 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 52 insertions(+), 4 deletions(-) diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 6eaffe50..15a0d331 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -102,7 +102,36 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) } /** + * batadv_mcast_addr_is_ipv4() - check if multicast MAC is IPv4 + * @addr: the MAC address to check + * + * Return: True, if MAC address is one reserved for IPv4 multicast, false + * otherwise. + */ +static bool batadv_mcast_addr_is_ipv4(unsigned char *addr) +{ + const unsigned char prefix[] = { 0x01, 0x00, 0x5E }; + + return !memcmp(prefix, addr, sizeof(prefix)); +} + +/** + * batadv_mcast_addr_is_ipv6() - check if multicast MAC is IPv6 + * @addr: the MAC address to check + * + * Return: True, if MAC address is one reserved for IPv6 multicast, false + * otherwise. + */ +static bool batadv_mcast_addr_is_ipv6(unsigned char *addr) +{ + const unsigned char prefix[] = { 0x33, 0x33 }; + + return !memcmp(prefix, addr, sizeof(prefix)); +} + +/** * batadv_mcast_mla_softif_get() - get softif multicast listeners + * @bat_priv: the bat priv with all the soft interface information * @dev: the device to collect multicast addresses from * @mcast_list: a list to put found addresses into * @@ -119,9 +148,12 @@ static struct net_device *batadv_mcast_get_bridge(struct net_device *soft_iface) * Return: -ENOMEM on memory allocation error or the number of * items added to the mcast_list otherwise. */ -static int batadv_mcast_mla_softif_get(struct net_device *dev, +static int batadv_mcast_mla_softif_get(struct batadv_priv *bat_priv, + struct net_device *dev, struct hlist_head *mcast_list) { + bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; + bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; struct net_device *bridge = batadv_mcast_get_bridge(dev); struct netdev_hw_addr *mc_list_entry; struct batadv_hw_addr *new; @@ -129,6 +161,12 @@ static int batadv_mcast_mla_softif_get(struct net_device *dev, netif_addr_lock_bh(bridge ? bridge : dev); netdev_for_each_mc_addr(mc_list_entry, bridge ? bridge : dev) { + if (all_ipv4 && batadv_mcast_addr_is_ipv4(mc_list_entry->addr)) + continue; + + if (all_ipv6 && batadv_mcast_addr_is_ipv6(mc_list_entry->addr)) + continue; + new = kmalloc(sizeof(*new), GFP_ATOMIC); if (!new) { ret = -ENOMEM; @@ -193,6 +231,7 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) /** * batadv_mcast_mla_bridge_get() - get bridged-in multicast listeners + * @bat_priv: the bat priv with all the soft interface information * @dev: a bridge slave whose bridge to collect multicast addresses from * @mcast_list: a list to put found addresses into * @@ -204,10 +243,13 @@ static void batadv_mcast_mla_br_addr_cpy(char *dst, const struct br_ip *src) * Return: -ENOMEM on memory allocation error or the number of * items added to the mcast_list otherwise. */ -static int batadv_mcast_mla_bridge_get(struct net_device *dev, +static int batadv_mcast_mla_bridge_get(struct batadv_priv *bat_priv, + struct net_device *dev, struct hlist_head *mcast_list) { struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list); + bool all_ipv4 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV4; + bool all_ipv6 = bat_priv->mcast.flags & BATADV_MCAST_WANT_ALL_IPV6; struct br_ip_list *br_ip_entry, *tmp; struct batadv_hw_addr *new; u8 mcast_addr[ETH_ALEN]; @@ -221,6 +263,12 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev, goto out; list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) { + if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP)) + continue; + + if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6)) + continue; + batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr); if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list)) continue; @@ -568,11 +616,11 @@ static void __batadv_mcast_mla_update(struct batadv_priv *bat_priv) if (!batadv_mcast_mla_tvlv_update(bat_priv)) goto update; - ret = batadv_mcast_mla_softif_get(soft_iface, &mcast_list); + ret = batadv_mcast_mla_softif_get(bat_priv, soft_iface, &mcast_list); if (ret < 0) goto out; - ret = batadv_mcast_mla_bridge_get(soft_iface, &mcast_list); + ret = batadv_mcast_mla_bridge_get(bat_priv, soft_iface, &mcast_list); if (ret < 0) goto out; -- 2.11.0

2 1

[B.A.T.M.A.N.] [PATCH maint v3] batman-adv: Fix multicast packet loss with a single WANT_ALL_IPV4/6 flag
by Linus Lüssing 04 Mar '18

04 Mar '18

As the kernel doc describes too the code is supposed to skip adding multicast TT entries if both the WANT_ALL_IPV4 and WANT_ALL_IPV6 flags are present. Unfortunately, the current code even skips adding multicast TT entries if only either the WANT_ALL_IPV4 or WANT_ALL_IPV6 is present. This could lead to IPv6 multicast packet loss if only an IGMP but not an MLD querier is present for instance or vice versa. Fixes: 391b59cdb111 ("batman-adv: Add multicast optimization support for bridged setups") Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- v3: Added "Fixes:" line v2: Fixed typo in last sentence: "non" -> "not" net/batman-adv/multicast.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 6eaffe50..15a7b314 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -543,8 +543,8 @@ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) bat_priv->mcast.enabled = true; } - return !(mcast_data.flags & - (BATADV_MCAST_WANT_ALL_IPV4 | BATADV_MCAST_WANT_ALL_IPV6)); + return !(mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV4 && + mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV6); } /** -- 2.11.0

2 1

[B.A.T.M.A.N.] [PATCH maint v2] batman-adv: Fix multicast packet loss with a single WANT_ALL_IPV4/6 flag
by Linus Lüssing 04 Mar '18

04 Mar '18

As the kernel doc describes too the code is supposed to skip adding multicast TT entries if both the WANT_ALL_IPV4 and WANT_ALL_IPV6 flags are present. Unfortunately, the current code even skips adding multicast TT entries if only either the WANT_ALL_IPV4 or WANT_ALL_IPV6 is present. This could lead to IPv6 multicast packet loss if only an IGMP but not an MLD querier is present for instance or vice versa. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- v2: Fixed typo in last sentence: "non" -> "not" net/batman-adv/multicast.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 6eaffe50..15a7b314 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -543,8 +543,8 @@ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) bat_priv->mcast.enabled = true; } - return !(mcast_data.flags & - (BATADV_MCAST_WANT_ALL_IPV4 | BATADV_MCAST_WANT_ALL_IPV6)); + return !(mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV4 && + mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV6); } /** -- 2.11.0

1 0

[B.A.T.M.A.N.] [PATCH maint] batman-adv: Fix multicast packet loss with a single WANT_ALL_IPV4/6 flag
by Linus Lüssing 04 Mar '18

04 Mar '18

As the kernel doc describes too the code is supposed to skip adding multicast TT entries if both the WANT_ALL_IPV4 and WANT_ALL_IPV6 flags are present. Unfortunately, the current code even skips adding multicast TT entries if only either the WANT_ALL_IPV4 or WANT_ALL_IPV6 is present. This could lead to IPv6 multicast packet loss if only an IGMP but non an MLD querier is present for instance or vice versa. Signed-off-by: Linus Lüssing <linus.luessing(a)c0d3.blue> --- net/batman-adv/multicast.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index 6eaffe50..15a7b314 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -543,8 +543,8 @@ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv) bat_priv->mcast.enabled = true; } - return !(mcast_data.flags & - (BATADV_MCAST_WANT_ALL_IPV4 | BATADV_MCAST_WANT_ALL_IPV6)); + return !(mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV4 && + mcast_data.flags & BATADV_MCAST_WANT_ALL_IPV6); } /** -- 2.11.0

1 0

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B.A.T.M.A.N March 2018