From: Sven Eckelmann sven@narfation.org
Sending functions in Linux consume the supplied skbuff. Doing the same in batadv_send_skb_to_orig avoids the hack of returning -1 (-EPERM) to signal the caller that he is responsible for cleaning up the skb.
Signed-off-by: Sven Eckelmann sven@narfation.org Signed-off-by: Simon Wunderlich sw@simonwunderlich.de --- net/batman-adv/routing.c | 11 ++--------- net/batman-adv/send.c | 39 ++++++++++++++++++++++----------------- net/batman-adv/tp_meter.c | 6 ------ net/batman-adv/tvlv.c | 5 +---- 4 files changed, 25 insertions(+), 36 deletions(-)
diff --git a/net/batman-adv/routing.c b/net/batman-adv/routing.c index a4cb157..4d2679a 100644 --- a/net/batman-adv/routing.c +++ b/net/batman-adv/routing.c @@ -262,9 +262,6 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv, icmph->ttl = BATADV_TTL;
res = batadv_send_skb_to_orig(skb, orig_node, NULL); - if (res == -1) - goto out; - ret = NET_RX_SUCCESS;
break; @@ -325,8 +322,7 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv, icmp_packet->ttl = BATADV_TTL;
res = batadv_send_skb_to_orig(skb, orig_node, NULL); - if (res != -1) - ret = NET_RX_SUCCESS; + ret = NET_RX_SUCCESS;
out: if (primary_if) @@ -413,8 +409,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
/* route it */ res = batadv_send_skb_to_orig(skb, orig_node, recv_if); - if (res != -1) - ret = NET_RX_SUCCESS; + ret = NET_RX_SUCCESS;
out: if (orig_node) @@ -702,8 +697,6 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
len = skb->len; res = batadv_send_skb_to_orig(skb, orig_node, recv_if); - if (res == -1) - goto out;
/* translate transmit result into receive result */ if (res == NET_XMIT_SUCCESS) { diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c index 0f86293..b00aac7 100644 --- a/net/batman-adv/send.c +++ b/net/batman-adv/send.c @@ -165,11 +165,9 @@ int batadv_send_unicast_skb(struct sk_buff *skb, * host, NULL can be passed as recv_if and no interface alternating is * attempted. * - * Return: -1 on failure (and the skb is not consumed), -EINPROGRESS if the - * skb is buffered for later transmit or the NET_XMIT status returned by the + * Return: negative errno code on a failure, -EINPROGRESS if the skb is + * buffered for later transmit or the NET_XMIT status returned by the * lower routine if the packet has been passed down. - * - * If the returning value is not -1 the skb has been consumed. */ int batadv_send_skb_to_orig(struct sk_buff *skb, struct batadv_orig_node *orig_node, @@ -177,12 +175,14 @@ int batadv_send_skb_to_orig(struct sk_buff *skb, { struct batadv_priv *bat_priv = orig_node->bat_priv; struct batadv_neigh_node *neigh_node; - int ret = -1; + int ret;
/* batadv_find_router() increases neigh_nodes refcount if found. */ neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); - if (!neigh_node) - goto out; + if (!neigh_node) { + ret = -EINVAL; + goto free_skb; + }
/* Check if the skb is too large to send in one piece and fragment * it if needed. @@ -191,8 +191,10 @@ int batadv_send_skb_to_orig(struct sk_buff *skb, skb->len > neigh_node->if_incoming->net_dev->mtu) { /* Fragment and send packet. */ ret = batadv_frag_send_packet(skb, orig_node, neigh_node); + /* skb was consumed */ + skb = NULL;
- goto out; + goto put_neigh_node; }
/* try to network code the packet, if it is received on an interface @@ -204,9 +206,13 @@ int batadv_send_skb_to_orig(struct sk_buff *skb, else ret = batadv_send_unicast_skb(skb, neigh_node);
-out: - if (neigh_node) - batadv_neigh_node_put(neigh_node); + /* skb was consumed */ + skb = NULL; + +put_neigh_node: + batadv_neigh_node_put(neigh_node); +free_skb: + kfree_skb(skb);
return ret; } @@ -327,7 +333,7 @@ int batadv_send_skb_unicast(struct batadv_priv *bat_priv, { struct batadv_unicast_packet *unicast_packet; struct ethhdr *ethhdr; - int res, ret = NET_XMIT_DROP; + int ret = NET_XMIT_DROP;
if (!orig_node) goto out; @@ -364,13 +370,12 @@ int batadv_send_skb_unicast(struct batadv_priv *bat_priv, if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) unicast_packet->ttvn = unicast_packet->ttvn - 1;
- res = batadv_send_skb_to_orig(skb, orig_node, NULL); - if (res != -1) - ret = NET_XMIT_SUCCESS; + ret = batadv_send_skb_to_orig(skb, orig_node, NULL); + /* skb was consumed */ + skb = NULL;
out: - if (ret == NET_XMIT_DROP) - kfree_skb(skb); + kfree_skb(skb); return ret; }
diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c index 2333777..f156452 100644 --- a/net/batman-adv/tp_meter.c +++ b/net/batman-adv/tp_meter.c @@ -615,9 +615,6 @@ static int batadv_tp_send_msg(struct batadv_tp_vars *tp_vars, const u8 *src, batadv_tp_fill_prerandom(tp_vars, data, data_len);
r = batadv_send_skb_to_orig(skb, orig_node, NULL); - if (r == -1) - kfree_skb(skb); - if (r == NET_XMIT_SUCCESS) return 0;
@@ -1206,9 +1203,6 @@ static int batadv_tp_send_ack(struct batadv_priv *bat_priv, const u8 *dst,
/* send the ack */ r = batadv_send_skb_to_orig(skb, orig_node, NULL); - if (r == -1) - kfree_skb(skb); - if (unlikely(r < 0) || (r == NET_XMIT_DROP)) { ret = BATADV_TP_REASON_DST_UNREACHABLE; goto out; diff --git a/net/batman-adv/tvlv.c b/net/batman-adv/tvlv.c index 77654f0..a783420 100644 --- a/net/batman-adv/tvlv.c +++ b/net/batman-adv/tvlv.c @@ -600,7 +600,6 @@ void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src, unsigned char *tvlv_buff; unsigned int tvlv_len; ssize_t hdr_len = sizeof(*unicast_tvlv_packet); - int res;
orig_node = batadv_orig_hash_find(bat_priv, dst); if (!orig_node) @@ -633,9 +632,7 @@ void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src, tvlv_buff += sizeof(*tvlv_hdr); memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
- res = batadv_send_skb_to_orig(skb, orig_node, NULL); - if (res == -1) - kfree_skb(skb); + batadv_send_skb_to_orig(skb, orig_node, NULL); out: batadv_orig_node_put(orig_node); }