From 7b3801927e52f8621de311277f7fc727635019e7 Mon Sep 17 00:00:00 2001 From: Sabrina Dubroca Date: Mon, 25 Nov 2019 14:48:58 +0100 Subject: xfrm: introduce xfrm_trans_queue_net This will be used by TCP encapsulation to write packets to the encap socket without holding the user socket's lock. Without this reinjection, we're already holding the lock of the user socket, and then try to lock the encap socket as well when we enqueue the encrypted packet. While at it, add a BUILD_BUG_ON like we usually do for skb->cb, since it's missing for struct xfrm_trans_cb. Co-developed-by: Herbert Xu Signed-off-by: Herbert Xu Signed-off-by: Sabrina Dubroca Acked-by: David S. Miller Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_input.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) (limited to 'net/xfrm') diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index 2c86a2fc3915..aa35f23c4912 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -36,6 +36,7 @@ struct xfrm_trans_cb { #endif } header; int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb); + struct net *net; }; #define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0])) @@ -766,12 +767,13 @@ static void xfrm_trans_reinject(unsigned long data) skb_queue_splice_init(&trans->queue, &queue); while ((skb = __skb_dequeue(&queue))) - XFRM_TRANS_SKB_CB(skb)->finish(dev_net(skb->dev), NULL, skb); + XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, + NULL, skb); } -int xfrm_trans_queue(struct sk_buff *skb, - int (*finish)(struct net *, struct sock *, - struct sk_buff *)) +int xfrm_trans_queue_net(struct net *net, struct sk_buff *skb, + int (*finish)(struct net *, struct sock *, + struct sk_buff *)) { struct xfrm_trans_tasklet *trans; @@ -780,11 +782,22 @@ int xfrm_trans_queue(struct sk_buff *skb, if (skb_queue_len(&trans->queue) >= netdev_max_backlog) return -ENOBUFS; + BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); + XFRM_TRANS_SKB_CB(skb)->finish = finish; + XFRM_TRANS_SKB_CB(skb)->net = net; __skb_queue_tail(&trans->queue, skb); tasklet_schedule(&trans->tasklet); return 0; } +EXPORT_SYMBOL(xfrm_trans_queue_net); + +int xfrm_trans_queue(struct sk_buff *skb, + int (*finish)(struct net *, struct sock *, + struct sk_buff *)) +{ + return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish); +} EXPORT_SYMBOL(xfrm_trans_queue); void __init xfrm_input_init(void) -- cgit v1.2.3