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path: root/net/ipv4/ip_sockglue.c
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Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c33
1 files changed, 23 insertions, 10 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 31d8c71986b4..5cd99271d3a6 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -432,17 +432,32 @@ void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 port, u32 inf
kfree_skb(skb);
}
-static bool ipv4_pktinfo_prepare_errqueue(const struct sock *sk,
- const struct sk_buff *skb,
- int ee_origin)
+/* IPv4 supports cmsg on all imcp errors and some timestamps
+ *
+ * Timestamp code paths do not initialize the fields expected by cmsg:
+ * the PKTINFO fields in skb->cb[]. Fill those in here.
+ */
+static bool ipv4_datagram_support_cmsg(const struct sock *sk,
+ struct sk_buff *skb,
+ int ee_origin)
{
- struct in_pktinfo *info = PKTINFO_SKB_CB(skb);
+ struct in_pktinfo *info;
+
+ if (ee_origin == SO_EE_ORIGIN_ICMP)
+ return true;
- if ((ee_origin != SO_EE_ORIGIN_TIMESTAMPING) ||
- (!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
+ if (ee_origin == SO_EE_ORIGIN_LOCAL)
+ return false;
+
+ /* Support IP_PKTINFO on tstamp packets if requested, to correlate
+ * timestamp with egress dev. Not possible for packets without dev
+ * or without payload (SOF_TIMESTAMPING_OPT_TSONLY).
+ */
+ if ((!(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_CMSG)) ||
(!skb->dev))
return false;
+ info = PKTINFO_SKB_CB(skb);
info->ipi_spec_dst.s_addr = ip_hdr(skb)->saddr;
info->ipi_ifindex = skb->dev->ifindex;
return true;
@@ -483,7 +498,7 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
serr = SKB_EXT_ERR(skb);
- if (sin && skb->len) {
+ if (sin && serr->port) {
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = *(__be32 *)(skb_network_header(skb) +
serr->addr_offset);
@@ -496,9 +511,7 @@ int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
sin = &errhdr.offender;
memset(sin, 0, sizeof(*sin));
- if (skb->len &&
- (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
- ipv4_pktinfo_prepare_errqueue(sk, skb, serr->ee.ee_origin))) {
+ if (ipv4_datagram_support_cmsg(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)