From 1149557d64c97dc9adf3103347a1c0e8c06d3b89 Mon Sep 17 00:00:00 2001 From: Jon Paul Maloy Date: Fri, 13 Mar 2015 16:08:07 -0400 Subject: [PATCH] tipc: eliminate unnecessary linearization of incoming buffers Currently, TIPC linearizes all incoming buffers directly at reception before passing them upwards in the stack. This is clearly a waste of CPU resources, and must be avoided. In this commit, we eliminate this unnecessary linearization. We still ensure that at least the message header is linear, and that the buffer is linearized where this is still needed, i.e. when unbundling and when reversing messages. In addition, we ensure that fragmented messages are validated after reassembly before delivering them upwards in the stack. Reviewed-by: Erik Hugne Reviewed-by: Ying Xue Signed-off-by: Jon Maloy Signed-off-by: David S. Miller --- net/tipc/link.c | 5 ----- net/tipc/msg.c | 14 ++++++++++---- 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/net/tipc/link.c b/net/tipc/link.c index 944c8c663a2d..8c6639d107fc 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1075,13 +1075,8 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) if (unlikely(!tipc_msg_validate(skb))) goto discard; - /* Ensure message data is a single contiguous unit */ - if (unlikely(skb_linearize(skb))) - goto discard; - /* Handle arrival of a non-unicast link message */ msg = buf_msg(skb); - if (unlikely(msg_non_seq(msg))) { if (msg_user(msg) == LINK_CONFIG) tipc_disc_rcv(net, skb, b_ptr); diff --git a/net/tipc/msg.c b/net/tipc/msg.c index 4a64caf6fa20..ff8c64cd1cd9 100644 --- a/net/tipc/msg.c +++ b/net/tipc/msg.c @@ -165,6 +165,9 @@ int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf) } if (fragid == LAST_FRAGMENT) { + TIPC_SKB_CB(head)->validated = false; + if (unlikely(!tipc_msg_validate(head))) + goto err; *buf = head; TIPC_SKB_CB(head)->tail = NULL; *headbuf = NULL; @@ -172,7 +175,6 @@ int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf) } *buf = NULL; return 0; - err: pr_warn_ratelimited("Unable to build fragment list\n"); kfree_skb(*buf); @@ -378,10 +380,14 @@ bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu) */ bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos) { - struct tipc_msg *msg = buf_msg(skb); + struct tipc_msg *msg; int imsz; - struct tipc_msg *imsg = (struct tipc_msg *)(msg_data(msg) + *pos); + struct tipc_msg *imsg; + if (unlikely(skb_linearize(skb))) + return false; + msg = buf_msg(skb); + imsg = (struct tipc_msg *)(msg_data(msg) + *pos); /* Is there space left for shortest possible message? */ if (*pos > (msg_data_sz(msg) - SHORT_H_SIZE)) goto none; @@ -463,11 +469,11 @@ bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode, if (skb_linearize(buf)) goto exit; + msg = buf_msg(buf); if (msg_dest_droppable(msg)) goto exit; if (msg_errcode(msg)) goto exit; - memcpy(&ohdr, msg, msg_hdr_sz(msg)); imp = min_t(uint, imp + 1, TIPC_CRITICAL_IMPORTANCE); if (msg_isdata(msg)) -- 2.20.1