From patchwork Sun Jul 17 19:04:03 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sven Eckelmann X-Patchwork-Id: 16541 X-Patchwork-Delegate: sw@simonwunderlich.de Return-Path: X-Original-To: patchwork@open-mesh.org Delivered-To: patchwork@open-mesh.org Received: from open-mesh.org (localhost [IPv6:::1]) by open-mesh.org (Postfix) with ESMTP id BBAEB82CD8; Sun, 17 Jul 2016 21:04:43 +0200 (CEST) Authentication-Results: open-mesh.org; dmarc=none header.from=narfation.org Authentication-Results: open-mesh.org; dkim=fail reason="verification failed; unprotected key" header.d=narfation.org header.i=@narfation.org header.b=0wwwx+2D; dkim-adsp=fail (unprotected policy); dkim-atps=neutral Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=79.140.41.39; helo=v3-1039.vlinux.de; envelope-from=sven@narfation.org; receiver=b.a.t.m.a.n@lists.open-mesh.org Authentication-Results: open-mesh.org; dmarc=pass header.from=narfation.org Received: from v3-1039.vlinux.de (narfation.org [79.140.41.39]) by open-mesh.org (Postfix) with ESMTPS id 321C982CCE for ; Sun, 17 Jul 2016 21:04:23 +0200 (CEST) Received: from sven-desktop.home.narfation.org (p200300C593C633F90000000000002E16.dip0.t-ipconnect.de [IPv6:2003:c5:93c6:33f9::2e16]) by v3-1039.vlinux.de (Postfix) with ESMTPSA id 495901100F1; Sun, 17 Jul 2016 21:04:22 +0200 (CEST) Authentication-Results: v3-1039.vlinux.de; dmarc=none header.from=narfation.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=narfation.org; s=20121; t=1468782262; bh=TYSEtyRh4UiM3uuGefOsFz5uj2i/d9+C9xly5HQuIvI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0wwwx+2D7phJsrEIPsQBhO4AZpZfeh9t7mrlepvQOjqA+5tk2FazorKCVYuCPumvg wQJ0iMuLjJO7NHkkRMQi+6EAqAhf4zi7TeNDJ//LXh2VCbA8+Kwcgs9BkssldfgetW zbngFHVXapG6zhoS5lZBnPwzAjp8+1zAlB7n7lmY= From: Sven Eckelmann To: b.a.t.m.a.n@lists.open-mesh.org Date: Sun, 17 Jul 2016 21:04:03 +0200 Message-Id: <1468782245-12985-4-git-send-email-sven@narfation.org> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1468782245-12985-1-git-send-email-sven@narfation.org> References: <1468782245-12985-1-git-send-email-sven@narfation.org> Subject: [B.A.T.M.A.N.] [PATCH 4/6] batman-adv: Consume skb in batadv_send_skb_to_orig X-BeenThere: b.a.t.m.a.n@lists.open-mesh.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: The list for a Better Approach To Mobile Ad-hoc Networking List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: The list for a Better Approach To Mobile Ad-hoc Networking Errors-To: b.a.t.m.a.n-bounces@lists.open-mesh.org Sender: "B.A.T.M.A.N" 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 --- 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 610f2c4..49ff1cf 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) @@ -676,8 +671,6 @@ 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 4f44ee2..4254172 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 3d1cf0f..221efa3 100644 --- a/net/batman-adv/tvlv.c +++ b/net/batman-adv/tvlv.c @@ -591,7 +591,6 @@ 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) @@ -624,9 +623,7 @@ 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); }