sparse complains about some harmless endianness issues:
> net/ipv4/ip_tunnel_core.c:225:43: warning: cast to restricted __be16
> net/ipv4/ip_tunnel_core.c:225:43: warning: incorrect type in initializer
> (different base types)
> net/ipv4/ip_tunnel_core.c:225:43: expected restricted __be16 [usertype] mtu
> net/ipv4/ip_tunnel_core.c:225:43: got unsigned short [usertype]
iptunnel_pmtud_build_icmp() uses the wrong flavour of byte-order conversion
when storing the MTU into the ICMPv4 packet. Use htons(), just like
iptunnel_pmtud_build_icmpv6() does.
> net/ipv4/ip_tunnel_core.c:248:35: warning: cast from restricted __be16
> net/ipv4/ip_tunnel_core.c:248:35: warning: incorrect type in argument 3
> (different base types)
> net/ipv4/ip_tunnel_core.c:248:35: expected unsigned short type
> net/ipv4/ip_tunnel_core.c:248:35: got restricted __be16 [usertype]
> net/ipv4/ip_tunnel_core.c:341:35: warning: cast from restricted __be16
> net/ipv4/ip_tunnel_core.c:341:35: warning: incorrect type in argument 3
> (different base types)
> net/ipv4/ip_tunnel_core.c:341:35: expected unsigned short type
> net/ipv4/ip_tunnel_core.c:341:35: got restricted __be16 [usertype]
eth_header() wants the Ethertype in host-order, use the correct flavour of
byte-order conversion.
> net/ipv4/ip_tunnel_core.c:600:45: warning: restricted __be16 degrades to
> integer
> net/ipv4/ip_tunnel_core.c:609:30: warning: incorrect type in assignment
> (different base types)
> net/ipv4/ip_tunnel_core.c:609:30: expected int type
> net/ipv4/ip_tunnel_core.c:609:30: got restricted __be16 [usertype]
> net/ipv4/ip_tunnel_core.c:619:30: warning: incorrect type in assignment
> (different base types)
> net/ipv4/ip_tunnel_core.c:619:30: expected int type
> net/ipv4/ip_tunnel_core.c:619:30: got restricted __be16 [usertype]
> net/ipv4/ip_tunnel_core.c:629:30: warning: incorrect type in assignment
> (different base types)
> net/ipv4/ip_tunnel_core.c:629:30: expected int type
> net/ipv4/ip_tunnel_core.c:629:30: got restricted __be16 [usertype]
The TUNNEL_* types are big-endian, so adjust the type of the local
variable in ip_tun_parse_opts().
Cc: Alexey Kuznetsov <kuz...@ms2.inr.ac.ru>
Cc: Hideaki YOSHIFUJI <yoshf...@linux-ipv6.org>
Signed-off-by: Julian Wiedmann <j...@linux.ibm.com>
---
net/ipv4/ip_tunnel_core.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 7ca338fbe8ba..6b2dc7b2b612 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -222,7 +222,7 @@ static int iptunnel_pmtud_build_icmp(struct sk_buff *skb,
int mtu)
.code = ICMP_FRAG_NEEDED,
.checksum = 0,
.un.frag.__unused = 0,
- .un.frag.mtu = ntohs(mtu),
+ .un.frag.mtu = htons(mtu),
};
icmph->checksum = ip_compute_csum(icmph, len);
skb_reset_transport_header(skb);
@@ -245,7 +245,7 @@ static int iptunnel_pmtud_build_icmp(struct sk_buff *skb,
int mtu)
skb->ip_summed = CHECKSUM_NONE;
- eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
+ eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
skb_reset_mac_header(skb);
return skb->len;
@@ -338,7 +338,7 @@ static int iptunnel_pmtud_build_icmpv6(struct sk_buff *skb,
int mtu)
skb->ip_summed = CHECKSUM_NONE;
- eth_header(skb, skb->dev, htons(eh.h_proto), eh.h_source, eh.h_dest, 0);
+ eth_header(skb, skb->dev, ntohs(eh.h_proto), eh.h_source, eh.h_dest, 0);
skb_reset_mac_header(skb);
return skb->len;
@@ -583,8 +583,9 @@ static int ip_tun_parse_opts_erspan(struct nlattr *attr,
static int ip_tun_parse_opts(struct nlattr *attr, struct ip_tunnel_info *info,
struct netlink_ext_ack *extack)
{
- int err, rem, opt_len, opts_len = 0, type = 0;
+ int err, rem, opt_len, opts_len = 0;
struct nlattr *nla;
+ __be16 type = 0;
if (!attr)
return 0;
--
2.17.1
