From: Antonio Quartulli antonio@open-mesh.com

the icmp and the icmp_rr packets share the same initial fields since they use the same code to be processed and forwarded.

Extract the common fields and put them into a separate struct so that future ICMP packets can be easily added without bloating the packet definition.

Signed-off-by: Antonio Quartulli antonio@open-mesh.com ---

This patches are based on top of "batman-adv: use __constant_htons when possible"

Cheers,

icmp_socket.c | 22 +++++++++++----------- main.c | 4 ++-- packet.h | 34 +++++++++++++++++++++++++--------- routing.c | 38 +++++++++++++++++++------------------- 4 files changed, 57 insertions(+), 41 deletions(-)

diff --git a/icmp_socket.c b/icmp_socket.c index b27508b..f0f018a 100644 --- a/icmp_socket.c +++ b/icmp_socket.c @@ -191,25 +191,25 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, goto free_skb; }

- if (icmp_packet->header.packet_type != BATADV_ICMP) { + if (icmp_packet->ih.header.packet_type != BATADV_ICMP) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n"); len = -EINVAL; goto free_skb; }

- if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { + if (icmp_packet->ih.msg_type != BATADV_ECHO_REQUEST) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n"); len = -EINVAL; goto free_skb; }

- icmp_packet->uid = socket_client->index; + icmp_packet->ih.uid = socket_client->index;

- if (icmp_packet->header.version != BATADV_COMPAT_VERSION) { - icmp_packet->msg_type = BATADV_PARAMETER_PROBLEM; - icmp_packet->header.version = BATADV_COMPAT_VERSION; + if (icmp_packet->ih.header.version != BATADV_COMPAT_VERSION) { + icmp_packet->ih.msg_type = BATADV_PARAMETER_PROBLEM; + icmp_packet->ih.header.version = BATADV_COMPAT_VERSION; batadv_socket_add_packet(socket_client, icmp_packet, packet_len); goto free_skb; @@ -218,7 +218,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) goto dst_unreach;

- orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); + orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->ih.dst); if (!orig_node) goto dst_unreach;

@@ -232,7 +232,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE) goto dst_unreach;

- memcpy(icmp_packet->orig, + memcpy(icmp_packet->ih.orig, primary_if->net_dev->dev_addr, ETH_ALEN);

if (packet_len == sizeof(struct batadv_icmp_packet_rr)) @@ -243,7 +243,7 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff, goto out;

dst_unreach: - icmp_packet->msg_type = BATADV_DESTINATION_UNREACHABLE; + icmp_packet->ih.msg_type = BATADV_DESTINATION_UNREACHABLE; batadv_socket_add_packet(socket_client, icmp_packet, packet_len); free_skb: kfree_skb(skb); @@ -317,7 +317,7 @@ static void batadv_socket_add_packet(struct batadv_socket_client *socket_client, /* while waiting for the lock the socket_client could have been * deleted */ - if (!batadv_socket_client_hash[icmp_packet->uid]) { + if (!batadv_socket_client_hash[icmp_packet->ih.uid]) { spin_unlock_bh(&socket_client->lock); kfree(socket_packet); return; @@ -346,7 +346,7 @@ void batadv_socket_receive_packet(struct batadv_icmp_packet_rr *icmp_packet, { struct batadv_socket_client *hash;

- hash = batadv_socket_client_hash[icmp_packet->uid]; + hash = batadv_socket_client_hash[icmp_packet->ih.uid]; if (hash) batadv_socket_add_packet(hash, icmp_packet, icmp_len); } diff --git a/main.c b/main.c index af89c09..81d496a 100644 --- a/main.c +++ b/main.c @@ -344,8 +344,8 @@ static void batadv_recv_handler_init(void) BUILD_BUG_ON(offsetof(struct batadv_unicast_packet, dest) != 4); BUILD_BUG_ON(offsetof(struct batadv_unicast_frag_packet, dest) != 4); BUILD_BUG_ON(offsetof(struct batadv_unicast_tvlv_packet, dst) != 4); - BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, dst) != 4); - BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, dst) != 4); + BUILD_BUG_ON(offsetof(struct batadv_icmp_packet, ih.dst) != 4); + BUILD_BUG_ON(offsetof(struct batadv_icmp_packet_rr, ih.dst) != 4);

/* broadcast packet */ batadv_rx_handler[BATADV_BCAST] = batadv_recv_bcast_packet; diff --git a/packet.h b/packet.h index 7d45890..6f98d02 100644 --- a/packet.h +++ b/packet.h @@ -192,28 +192,44 @@ struct batadv_ogm_packet {

#define BATADV_OGM_HLEN sizeof(struct batadv_ogm_packet)

-struct batadv_icmp_packet { +/** + * batadc_icmp_header - common ICMP header + * @header: common batman header + * @msg_type: ICMP packet type + * @dst: address of the destination node + * @orig: address of the source node + * @seqno: ICMP sequence number + * @uid: local ICMP socket identifier + */ +struct batadv_icmp_header { struct batadv_header header; uint8_t msg_type; /* see ICMP message types above */ uint8_t dst[ETH_ALEN]; uint8_t orig[ETH_ALEN]; __be16 seqno; uint8_t uid; +}; + +/** + * batadv_icmp_packet - ICMP packet + * @ih: common ICMP header + * @reserved: not used - useful for alignment + */ +struct batadv_icmp_packet { + struct batadv_icmp_header ih; uint8_t reserved; };

#define BATADV_RR_LEN 16

-/* icmp_packet_rr must start with all fields from imcp_packet - * as this is assumed by code that handles ICMP packets +/** + * batadv_icmp_packet_rr - ICMP RouteRecord packet + * @ih: common ICMP header + * @rr_cur: number of entries the rr array + * @rr: route record array */ struct batadv_icmp_packet_rr { - struct batadv_header header; - uint8_t msg_type; /* see ICMP message types above */ - uint8_t dst[ETH_ALEN]; - uint8_t orig[ETH_ALEN]; - __be16 seqno; - uint8_t uid; + struct batadv_icmp_header ih; uint8_t rr_cur; uint8_t rr[BATADV_RR_LEN][ETH_ALEN]; }; diff --git a/routing.c b/routing.c index 7c372f1..b448442 100644 --- a/routing.c +++ b/routing.c @@ -258,7 +258,7 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;

/* add data to device queue */ - if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { + if (icmp_packet->ih.msg_type != BATADV_ECHO_REQUEST) { batadv_socket_receive_packet(icmp_packet, icmp_len); goto out; } @@ -269,7 +269,7 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,

/* answer echo request (ping) */ /* get routing information */ - orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); + orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->ih.orig); if (!orig_node) goto out;

@@ -279,10 +279,10 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,

icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;

- memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); - memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); - icmp_packet->msg_type = BATADV_ECHO_REPLY; - icmp_packet->header.ttl = BATADV_TTL; + memcpy(icmp_packet->ih.dst, icmp_packet->ih.orig, ETH_ALEN); + memcpy(icmp_packet->ih.orig, primary_if->net_dev->dev_addr, ETH_ALEN); + icmp_packet->ih.msg_type = BATADV_ECHO_REPLY; + icmp_packet->ih.header.ttl = BATADV_TTL;

if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) ret = NET_RX_SUCCESS; @@ -306,9 +306,9 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, icmp_packet = (struct batadv_icmp_packet *)skb->data;

/* send TTL exceeded if packet is an echo request (traceroute) */ - if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) { + if (icmp_packet->ih.msg_type != BATADV_ECHO_REQUEST) { pr_debug("Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", - icmp_packet->orig, icmp_packet->dst); + icmp_packet->ih.orig, icmp_packet->ih.dst); goto out; }

@@ -317,7 +317,7 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, goto out;

/* get routing information */ - orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->orig); + orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->ih.orig); if (!orig_node) goto out;

@@ -327,10 +327,10 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,

icmp_packet = (struct batadv_icmp_packet *)skb->data;

- memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); - memcpy(icmp_packet->orig, primary_if->net_dev->dev_addr, ETH_ALEN); - icmp_packet->msg_type = BATADV_TTL_EXCEEDED; - icmp_packet->header.ttl = BATADV_TTL; + memcpy(icmp_packet->ih.dst, icmp_packet->ih.orig, ETH_ALEN); + memcpy(icmp_packet->ih.orig, primary_if->net_dev->dev_addr, ETH_ALEN); + icmp_packet->ih.msg_type = BATADV_TTL_EXCEEDED; + icmp_packet->ih.header.ttl = BATADV_TTL;

if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) ret = NET_RX_SUCCESS; @@ -379,8 +379,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;

/* add record route information if not full */ - if ((icmp_packet->msg_type == BATADV_ECHO_REPLY || - icmp_packet->msg_type == BATADV_ECHO_REQUEST) && + if ((icmp_packet->ih.msg_type == BATADV_ECHO_REPLY || + icmp_packet->ih.msg_type == BATADV_ECHO_REQUEST) && (hdr_size == sizeof(struct batadv_icmp_packet_rr)) && (icmp_packet->rr_cur < BATADV_RR_LEN)) { memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), @@ -389,15 +389,15 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, }

/* packet for me */ - if (batadv_is_my_mac(bat_priv, icmp_packet->dst)) + if (batadv_is_my_mac(bat_priv, icmp_packet->ih.dst)) return batadv_recv_my_icmp_packet(bat_priv, skb, hdr_size);

/* TTL exceeded */ - if (icmp_packet->header.ttl < 2) + if (icmp_packet->ih.header.ttl < 2) return batadv_recv_icmp_ttl_exceeded(bat_priv, skb);

/* get routing information */ - orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->dst); + orig_node = batadv_orig_hash_find(bat_priv, icmp_packet->ih.dst); if (!orig_node) goto out;

@@ -408,7 +408,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb, icmp_packet = (struct batadv_icmp_packet_rr *)skb->data;

/* decrement ttl */ - icmp_packet->header.ttl--; + icmp_packet->ih.header.ttl--;

/* route it */ if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)