diff options
| -rw-r--r-- | net/batman-adv/main.c | 2 | ||||
| -rw-r--r-- | net/batman-adv/packet.h | 41 | ||||
| -rw-r--r-- | net/batman-adv/routing.c | 8 | ||||
| -rw-r--r-- | net/batman-adv/soft-interface.c | 2 | ||||
| -rw-r--r-- | net/batman-adv/unicast.c | 135 | ||||
| -rw-r--r-- | net/batman-adv/unicast.h | 32 |
6 files changed, 194 insertions, 26 deletions
diff --git a/net/batman-adv/main.c b/net/batman-adv/main.c index f9bcfa17f50..afc07a865be 100644 --- a/net/batman-adv/main.c +++ b/net/batman-adv/main.c @@ -300,6 +300,8 @@ static void batadv_recv_handler_init(void) /* batman icmp packet */ batadv_rx_handler[BATADV_ICMP] = batadv_recv_icmp_packet; + /* unicast with 4 addresses packet */ + batadv_rx_handler[BATADV_UNICAST_4ADDR] = batadv_recv_unicast_packet; /* unicast packet */ batadv_rx_handler[BATADV_UNICAST] = batadv_recv_unicast_packet; /* fragmented unicast packet */ diff --git a/net/batman-adv/packet.h b/net/batman-adv/packet.h index b5f67a2687b..0f8dcf337df 100644 --- a/net/batman-adv/packet.h +++ b/net/batman-adv/packet.h @@ -23,14 +23,23 @@ #define BATADV_ETH_P_BATMAN 0x4305 /* unofficial/not registered Ethertype */ enum batadv_packettype { - BATADV_IV_OGM = 0x01, - BATADV_ICMP = 0x02, - BATADV_UNICAST = 0x03, - BATADV_BCAST = 0x04, - BATADV_VIS = 0x05, - BATADV_UNICAST_FRAG = 0x06, - BATADV_TT_QUERY = 0x07, - BATADV_ROAM_ADV = 0x08, + BATADV_IV_OGM = 0x01, + BATADV_ICMP = 0x02, + BATADV_UNICAST = 0x03, + BATADV_BCAST = 0x04, + BATADV_VIS = 0x05, + BATADV_UNICAST_FRAG = 0x06, + BATADV_TT_QUERY = 0x07, + BATADV_ROAM_ADV = 0x08, + BATADV_UNICAST_4ADDR = 0x09, +}; + +/** + * enum batadv_subtype - packet subtype for unicast4addr + * @BATADV_P_DATA: user payload + */ +enum batadv_subtype { + BATADV_P_DATA = 0x01, }; /* this file is included by batctl which needs these defines */ @@ -167,6 +176,22 @@ struct batadv_unicast_packet { */ }; +/** + * struct batadv_unicast_4addr_packet - extended unicast packet + * @u: common unicast packet header + * @src: address of the source + * @subtype: packet subtype + */ +struct batadv_unicast_4addr_packet { + struct batadv_unicast_packet u; + uint8_t src[ETH_ALEN]; + uint8_t subtype; + uint8_t reserved; + /* "4 bytes boundary + 2 bytes" long to make the payload after the + * following ethernet header again 4 bytes boundary aligned + */ +}; + struct batadv_unicast_frag_packet { struct batadv_header header; uint8_t ttvn; /* destination translation table version number */ diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index 46dd5b47ed2..859679b0828 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -986,14 +986,18 @@ int batadv_recv_unicast_packet(struct sk_buff *skb, struct batadv_unicast_packet *unicast_packet; int hdr_size = sizeof(*unicast_packet); + unicast_packet = (struct batadv_unicast_packet *)skb->data; + + /* the caller function should have already pulled 2 bytes */ + if (unicast_packet->header.packet_type == BATADV_UNICAST_4ADDR) + hdr_size = sizeof(struct batadv_unicast_4addr_packet); + if (batadv_check_unicast_packet(skb, hdr_size) < 0) return NET_RX_DROP; if (!batadv_check_unicast_ttvn(bat_priv, skb)) return NET_RX_DROP; - unicast_packet = (struct batadv_unicast_packet *)skb->data; - /* packet for me */ if (batadv_is_my_mac(unicast_packet->dest)) { batadv_interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size, diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c index 22bc6510237..2f123a1b174 100644 --- a/net/batman-adv/soft-interface.c +++ b/net/batman-adv/soft-interface.c @@ -260,7 +260,7 @@ static int batadv_interface_tx(struct sk_buff *skb, goto dropped; } - ret = batadv_unicast_send_skb(skb, bat_priv); + ret = batadv_unicast_send_skb(bat_priv, skb); if (ret != 0) goto dropped_freed; } diff --git a/net/batman-adv/unicast.c b/net/batman-adv/unicast.c index f39723281ca..c0d318b587e 100644 --- a/net/batman-adv/unicast.c +++ b/net/batman-adv/unicast.c @@ -291,7 +291,111 @@ out: return ret; } -int batadv_unicast_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv) +/** + * batadv_unicast_push_and_fill_skb - extends the buffer and initializes the + * common fields for unicast packets + * @skb: packet + * @hdr_size: amount of bytes to push at the beginning of the skb + * @orig_node: the destination node + * + * Returns false if the buffer extension was not possible or true otherwise + */ +static bool batadv_unicast_push_and_fill_skb(struct sk_buff *skb, int hdr_size, + struct batadv_orig_node *orig_node) +{ + struct batadv_unicast_packet *unicast_packet; + uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); + + if (batadv_skb_head_push(skb, hdr_size) < 0) + return false; + + unicast_packet = (struct batadv_unicast_packet *)skb->data; + unicast_packet->header.version = BATADV_COMPAT_VERSION; + /* batman packet type: unicast */ + unicast_packet->header.packet_type = BATADV_UNICAST; + /* set unicast ttl */ + unicast_packet->header.ttl = BATADV_TTL; + /* copy the destination for faster routing */ + memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); + /* set the destination tt version number */ + unicast_packet->ttvn = ttvn; + + return true; +} + +/** + * batadv_unicast_prepare_skb - encapsulate an skb with a unicast header + * @skb: the skb containing the payload to encapsulate + * @orig_node: the destination node + * + * Returns false if the payload could not be encapsulated or true otherwise + */ +static bool batadv_unicast_prepare_skb(struct sk_buff *skb, + struct batadv_orig_node *orig_node) +{ + size_t uni_size = sizeof(struct batadv_unicast_packet); + return batadv_unicast_push_and_fill_skb(skb, uni_size, orig_node); +} + +/** + * batadv_unicast_4addr_prepare_skb - encapsulate an skb with a unicast4addr + * header + * @bat_priv: the bat priv with all the soft interface information + * @skb: the skb containing the payload to encapsulate + * @orig_node: the destination node + * @packet_subtype: the batman 4addr packet subtype to use + * + * Returns false if the payload could not be encapsulated or true otherwise + */ +static bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv, + struct sk_buff *skb, + struct batadv_orig_node *orig, + int packet_subtype) +{ + struct batadv_hard_iface *primary_if; + struct batadv_unicast_4addr_packet *unicast_4addr_packet; + bool ret = false; + + primary_if = batadv_primary_if_get_selected(bat_priv); + if (!primary_if) + goto out; + + /* pull the header space and fill the unicast_packet substructure. + * We can do that because the first member of the unicast_4addr_packet + * is of type struct unicast_packet + */ + if (!batadv_unicast_push_and_fill_skb(skb, + sizeof(*unicast_4addr_packet), + orig)) + goto out; + + unicast_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; + unicast_4addr_packet->u.header.packet_type = BATADV_UNICAST_4ADDR; + memcpy(unicast_4addr_packet->src, primary_if->net_dev->dev_addr, + ETH_ALEN); + unicast_4addr_packet->subtype = packet_subtype; + unicast_4addr_packet->reserved = 0; + + ret = true; +out: + if (primary_if) + batadv_hardif_free_ref(primary_if); + return ret; +} + +/** + * batadv_unicast_generic_send_skb - send an skb as unicast + * @bat_priv: the bat priv with all the soft interface information + * @skb: payload to send + * @packet_type: the batman unicast packet type to use + * @packet_subtype: the batman packet subtype. It is ignored if packet_type is + * not BATADV_UNICAT_4ADDR + * + * Returns 1 in case of error or 0 otherwise + */ +int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv, + struct sk_buff *skb, int packet_type, + int packet_subtype) { struct ethhdr *ethhdr = (struct ethhdr *)skb->data; struct batadv_unicast_packet *unicast_packet; @@ -324,21 +428,23 @@ find_router: if (!neigh_node) goto out; - if (batadv_skb_head_push(skb, sizeof(*unicast_packet)) < 0) + switch (packet_type) { + case BATADV_UNICAST: + batadv_unicast_prepare_skb(skb, orig_node); + break; + case BATADV_UNICAST_4ADDR: + batadv_unicast_4addr_prepare_skb(bat_priv, skb, orig_node, + packet_subtype); + break; + default: + /* this function supports UNICAST and UNICAST_4ADDR only. It + * should never be invoked with any other packet type + */ goto out; + } unicast_packet = (struct batadv_unicast_packet *)skb->data; - unicast_packet->header.version = BATADV_COMPAT_VERSION; - /* batman packet type: unicast */ - unicast_packet->header.packet_type = BATADV_UNICAST; - /* set unicast ttl */ - unicast_packet->header.ttl = BATADV_TTL; - /* copy the destination for faster routing */ - memcpy(unicast_packet->dest, orig_node->orig, ETH_ALEN); - /* set the destination tt version number */ - unicast_packet->ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); - /* inform the destination node that we are still missing a correct route * for this client. The destination will receive this packet and will * try to reroute it because the ttvn contained in the header is less @@ -348,7 +454,9 @@ find_router: unicast_packet->ttvn = unicast_packet->ttvn - 1; dev_mtu = neigh_node->if_incoming->net_dev->mtu; - if (atomic_read(&bat_priv->fragmentation) && + /* fragmentation mechanism only works for UNICAST (now) */ + if (packet_type == BATADV_UNICAST && + atomic_read(&bat_priv->fragmentation) && data_len + sizeof(*unicast_packet) > dev_mtu) { /* send frag skb decreases ttl */ unicast_packet->header.ttl++; @@ -360,7 +468,6 @@ find_router: batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); ret = 0; - goto out; out: if (neigh_node) diff --git a/net/batman-adv/unicast.h b/net/batman-adv/unicast.h index 1c46e2eb1ef..a88ed2941c6 100644 --- a/net/batman-adv/unicast.h +++ b/net/batman-adv/unicast.h @@ -29,10 +29,40 @@ int batadv_frag_reassemble_skb(struct sk_buff *skb, struct batadv_priv *bat_priv, struct sk_buff **new_skb); void batadv_frag_list_free(struct list_head *head); -int batadv_unicast_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv); int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv, struct batadv_hard_iface *hard_iface, const uint8_t dstaddr[]); +int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv, + struct sk_buff *skb, int packet_type, + int packet_subtype); + + +/** + * batadv_unicast_send_skb - send the skb encapsulated in a unicast packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: the payload to send + */ +static inline int batadv_unicast_send_skb(struct batadv_priv *bat_priv, + struct sk_buff *skb) +{ + return batadv_unicast_generic_send_skb(bat_priv, skb, BATADV_UNICAST, + 0); +} + +/** + * batadv_unicast_send_skb - send the skb encapsulated in a unicast4addr packet + * @bat_priv: the bat priv with all the soft interface information + * @skb: the payload to send + * @packet_subtype: the batman 4addr packet subtype to use + */ +static inline int batadv_unicast_4addr_send_skb(struct batadv_priv *bat_priv, + struct sk_buff *skb, + int packet_subtype) +{ + return batadv_unicast_generic_send_skb(bat_priv, skb, + BATADV_UNICAST_4ADDR, + packet_subtype); +} static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu) { |