Commit f132ae7c authored by Jiri Benc's avatar Jiri Benc Committed by David S. Miller

gre: change gre_parse_header to return the header length

It's easier for gre_parse_header to return the header length instead of
filing it into a parameter. That way, the callers that don't care about the
header length can just check whether the returned value is lower than zero.

In gre_err, the tunnel header must not be pulled. See commit b7f8fe25
("gre: do not pull header in ICMP error processing") for details.

This patch reduces the conflict between the mentioned commit and commit
95f5c64c ("gre: Move utility functions to common headers").
Signed-off-by: default avatarJiri Benc <jbenc@redhat.com>
Acked-by: default avatarTom Herbert <tom@herbertland.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d4011239
......@@ -26,7 +26,7 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version);
struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
u8 name_assign_type);
int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
bool *csum_err, int *hdr_len);
bool *csum_err);
static inline int gre_calc_hlen(__be16 o_flags)
{
......
......@@ -60,8 +60,9 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version)
}
EXPORT_SYMBOL_GPL(gre_del_protocol);
/* Fills in tpi and returns header length to be pulled. */
int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
bool *csum_err, int *ret_hdr_len)
bool *csum_err)
{
const struct gre_base_hdr *greh;
__be32 *options;
......@@ -119,8 +120,7 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
return -EINVAL;
}
}
*ret_hdr_len = hdr_len;
return 0;
return hdr_len;
}
EXPORT_SYMBOL(gre_parse_header);
......
......@@ -221,16 +221,12 @@ static void gre_err(struct sk_buff *skb, u32 info)
const int code = icmp_hdr(skb)->code;
struct tnl_ptk_info tpi;
bool csum_err = false;
int hdr_len;
if (gre_parse_header(skb, &tpi, &csum_err, &hdr_len)) {
if (gre_parse_header(skb, &tpi, &csum_err) < 0) {
if (!csum_err) /* ignore csum errors. */
return;
}
if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
return;
if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
ipv4_update_pmtu(skb, dev_net(skb->dev), info,
skb->dev->ifindex, 0, IPPROTO_GRE, 0);
......@@ -314,7 +310,8 @@ static int gre_rcv(struct sk_buff *skb)
}
#endif
if (gre_parse_header(skb, &tpi, &csum_err, &hdr_len) < 0)
hdr_len = gre_parse_header(skb, &tpi, &csum_err);
if (hdr_len < 0)
goto drop;
if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
......
......@@ -468,7 +468,8 @@ static int gre_rcv(struct sk_buff *skb)
bool csum_err = false;
int hdr_len;
if (gre_parse_header(skb, &tpi, &csum_err, &hdr_len) < 0)
hdr_len = gre_parse_header(skb, &tpi, &csum_err);
if (hdr_len < 0)
goto drop;
if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
......
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