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authorDave Airlie <airlied@redhat.com>2014-06-05 06:28:59 -0400
committerDave Airlie <airlied@redhat.com>2014-06-05 06:28:59 -0400
commit8d4ad9d4bb0a618c975a32d77087694ec6336f68 (patch)
treed18d12688174a623e3503b11118e44ef8186c90b /net/ipv4/ip_forward.c
parent5ea1f752ae04be403a3dc8ec876a60d7f5f6990a (diff)
parent9e9a928eed8796a0a1aaed7e0b676db86ba84594 (diff)
Merge commit '9e9a928eed8796a0a1aaed7e0b676db86ba84594' into drm-next
Merge drm-fixes into drm-next. Both i915 and radeon need this done for later patches. Conflicts: drivers/gpu/drm/drm_crtc_helper.c drivers/gpu/drm/i915/i915_drv.h drivers/gpu/drm/i915/i915_gem.c drivers/gpu/drm/i915/i915_gem_execbuffer.c drivers/gpu/drm/i915/i915_gem_gtt.c
Diffstat (limited to 'net/ipv4/ip_forward.c')
-rw-r--r--net/ipv4/ip_forward.c54
1 files changed, 2 insertions, 52 deletions
diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
index be8abe73bb9f..6f111e48e11c 100644
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -42,12 +42,12 @@
42static bool ip_may_fragment(const struct sk_buff *skb) 42static bool ip_may_fragment(const struct sk_buff *skb)
43{ 43{
44 return unlikely((ip_hdr(skb)->frag_off & htons(IP_DF)) == 0) || 44 return unlikely((ip_hdr(skb)->frag_off & htons(IP_DF)) == 0) ||
45 !skb->local_df; 45 skb->local_df;
46} 46}
47 47
48static bool ip_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu) 48static bool ip_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
49{ 49{
50 if (skb->len <= mtu || skb->local_df) 50 if (skb->len <= mtu)
51 return false; 51 return false;
52 52
53 if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu) 53 if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
@@ -56,53 +56,6 @@ static bool ip_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
56 return true; 56 return true;
57} 57}
58 58
59static bool ip_gso_exceeds_dst_mtu(const struct sk_buff *skb)
60{
61 unsigned int mtu;
62
63 if (skb->local_df || !skb_is_gso(skb))
64 return false;
65
66 mtu = ip_dst_mtu_maybe_forward(skb_dst(skb), true);
67
68 /* if seglen > mtu, do software segmentation for IP fragmentation on
69 * output. DF bit cannot be set since ip_forward would have sent
70 * icmp error.
71 */
72 return skb_gso_network_seglen(skb) > mtu;
73}
74
75/* called if GSO skb needs to be fragmented on forward */
76static int ip_forward_finish_gso(struct sk_buff *skb)
77{
78 struct dst_entry *dst = skb_dst(skb);
79 netdev_features_t features;
80 struct sk_buff *segs;
81 int ret = 0;
82
83 features = netif_skb_dev_features(skb, dst->dev);
84 segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK);
85 if (IS_ERR(segs)) {
86 kfree_skb(skb);
87 return -ENOMEM;
88 }
89
90 consume_skb(skb);
91
92 do {
93 struct sk_buff *nskb = segs->next;
94 int err;
95
96 segs->next = NULL;
97 err = dst_output(segs);
98
99 if (err && ret == 0)
100 ret = err;
101 segs = nskb;
102 } while (segs);
103
104 return ret;
105}
106 59
107static int ip_forward_finish(struct sk_buff *skb) 60static int ip_forward_finish(struct sk_buff *skb)
108{ 61{
@@ -114,9 +67,6 @@ static int ip_forward_finish(struct sk_buff *skb)
114 if (unlikely(opt->optlen)) 67 if (unlikely(opt->optlen))
115 ip_forward_options(skb); 68 ip_forward_options(skb);
116 69
117 if (ip_gso_exceeds_dst_mtu(skb))
118 return ip_forward_finish_gso(skb);
119
120 return dst_output(skb); 70 return dst_output(skb);
121} 71}
122 72