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udp: no need to preserve skb->dst

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__ip_options_echo() does not need anymore skb->dst, so we can
avoid explicitly preserving it for its own sake.

This is almost a revert of commit 0ddf3fb2c4 ("udp: preserve
skb->dst if required for IP options processing") plus some
lifting to fit later changes.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2017-08-03 18:07:08 +02:00 committed by David S. Miller
parent 61a1030bad
commit 3bdefdf9d9
1 changed files with 5 additions and 8 deletions
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13
net/ipv4/udp.c
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@ -1176,7 +1176,11 @@ static void udp_set_dev_scratch(struct sk_buff *skb)
scratch->csum_unnecessary = !!skb_csum_unnecessary(skb);
scratch->is_linear = !skb_is_nonlinear(skb);
#endif
if (likely(!skb->_skb_refdst))
/* all head states execept sp (dst, sk, nf) are always cleared by
* udp_rcv() and we need to preserve secpath, if present, to eventually
* process IP_CMSG_PASSSEC at recvmsg() time
*/
if (likely(!skb_sec_path(skb)))
scratch->_tsize_state |= UDP_SKB_IS_STATELESS;
}
@ -1782,13 +1786,6 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
sk_mark_napi_id_once(sk, skb);
}
/* At recvmsg() time we may access skb->dst or skb->sp depending on
* the IP options and the cmsg flags, elsewhere can we clear all
* pending head states while they are hot in the cache
*/
if (likely(IPCB(skb)->opt.optlen == 0 && !skb_sec_path(skb)))
skb_release_head_state(skb);
rc = __udp_enqueue_schedule_skb(sk, skb);
if (rc < 0) {
int is_udplite = IS_UDPLITE(sk);