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authorWillem de Bruijn <willemb@google.com>2015-01-30 13:29:31 -0500
committerDavid S. Miller <davem@davemloft.net>2015-02-02 18:46:51 -0800
commit49ca0d8bfaf3bc46d5eef60ce67b00eb195bd392 (patch)
treed2f55a32923f6d91fcb2e0d0e0b6d2d4eb6f9abd /net/ipv4/ip_sockglue.c
parent9766e97af1b901ffbb36fcc648e50626d926bb24 (diff)
net-timestamp: no-payload option
Add timestamping option SOF_TIMESTAMPING_OPT_TSONLY. For transmit timestamps, this loops timestamps on top of empty packets. Doing so reduces the pressure on SO_RCVBUF. Payload inspection and cmsg reception (aside from timestamps) are no longer possible. This works together with a follow on patch that allows administrators to only allow tx timestamping if it does not loop payload or metadata. Signed-off-by: Willem de Bruijn <willemb@google.com> ---- Changes (rfc -> v1) - add documentation - remove unnecessary skb->len test (thanks to Richard Cochran) Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index db5e0f81ce0a..31d8c71986b4 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -483,7 +483,7 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
serr = SKB_EXT_ERR(skb);
- if (sin) {
+ if (sin && skb->len) {
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
serr->addr_offset);
@@ -496,8 +496,9 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
sin = &errhdr.offender;
memset(sin, 0, sizeof(*sin));
- if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
- ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin)) {
+ if (skb->len &&
+ (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
+ ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin))) {
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
if (inet_sk(sk)->cmsg_flags)