diff options
| author | Jiri Benc | 2016-05-03 15:00:21 +0200 |
|---|---|---|
| committer | David S. Miller | 2016-05-04 12:44:45 -0400 |
| commit | f132ae7c46370c981412a68ccec9f2145812a9b6 (patch) | |
| tree | 4c1371e6f9b81dbe781c10c2a7109f022ea1caec | |
| parent | d4011239f46ac6e407af61e3f74d1e3874fc9394 (diff) | |
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 b7f8fe251e46
("gre: do not pull header in ICMP error processing") for details.
This patch reduces the conflict between the mentioned commit and commit
95f5c64c3c13 ("gre: Move utility functions to common headers").
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/gre.h | 2 | ||||
| -rw-r--r-- | net/ipv4/gre_demux.c | 6 | ||||
| -rw-r--r-- | net/ipv4/ip_gre.c | 9 | ||||
| -rw-r--r-- | net/ipv6/ip6_gre.c | 3 |
4 files changed, 9 insertions, 11 deletions
diff --git a/include/net/gre.h b/include/net/gre.h index 29e37322c06e..a14093c70eab 100644 --- a/include/net/gre.h +++ b/include/net/gre.h @@ -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) { diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c index 371674801e84..a41e73ab1369 100644 --- a/net/ipv4/gre_demux.c +++ b/net/ipv4/gre_demux.c @@ -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); diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index b99213c46aac..8260a707b9b8 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -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)) diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index 10127741a60d..47b671a46dc4 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -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)) |