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net: gre: move GSO functions to gre_offload
Similarly to TCP/UDP offloading, move all related GRE functions to gre_offload.c to make things more explicit and similar to the rest of the code. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Daniel Borkmann
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David S. Miller
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Jul 3, 2013
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,127 @@ | ||
| /* | ||
| * IPV4 GSO/GRO offload support | ||
| * Linux INET implementation | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public License | ||
| * as published by the Free Software Foundation; either version | ||
| * 2 of the License, or (at your option) any later version. | ||
| * | ||
| * GRE GSO support | ||
| */ | ||
|
|
||
| #include <linux/skbuff.h> | ||
| #include <net/protocol.h> | ||
| #include <net/gre.h> | ||
|
|
||
| static int gre_gso_send_check(struct sk_buff *skb) | ||
| { | ||
| if (!skb->encapsulation) | ||
| return -EINVAL; | ||
| return 0; | ||
| } | ||
|
|
||
| static struct sk_buff *gre_gso_segment(struct sk_buff *skb, | ||
| netdev_features_t features) | ||
| { | ||
| struct sk_buff *segs = ERR_PTR(-EINVAL); | ||
| netdev_features_t enc_features; | ||
| int ghl = GRE_HEADER_SECTION; | ||
| struct gre_base_hdr *greh; | ||
| int mac_len = skb->mac_len; | ||
| __be16 protocol = skb->protocol; | ||
| int tnl_hlen; | ||
| bool csum; | ||
|
|
||
| if (unlikely(skb_shinfo(skb)->gso_type & | ||
| ~(SKB_GSO_TCPV4 | | ||
| SKB_GSO_TCPV6 | | ||
| SKB_GSO_UDP | | ||
| SKB_GSO_DODGY | | ||
| SKB_GSO_TCP_ECN | | ||
| SKB_GSO_GRE))) | ||
| goto out; | ||
|
|
||
| if (unlikely(!pskb_may_pull(skb, sizeof(*greh)))) | ||
| goto out; | ||
|
|
||
| greh = (struct gre_base_hdr *)skb_transport_header(skb); | ||
|
|
||
| if (greh->flags & GRE_KEY) | ||
| ghl += GRE_HEADER_SECTION; | ||
| if (greh->flags & GRE_SEQ) | ||
| ghl += GRE_HEADER_SECTION; | ||
| if (greh->flags & GRE_CSUM) { | ||
| ghl += GRE_HEADER_SECTION; | ||
| csum = true; | ||
| } else | ||
| csum = false; | ||
|
|
||
| /* setup inner skb. */ | ||
| skb->protocol = greh->protocol; | ||
| skb->encapsulation = 0; | ||
|
|
||
| if (unlikely(!pskb_may_pull(skb, ghl))) | ||
| goto out; | ||
|
|
||
| __skb_pull(skb, ghl); | ||
| skb_reset_mac_header(skb); | ||
| skb_set_network_header(skb, skb_inner_network_offset(skb)); | ||
| skb->mac_len = skb_inner_network_offset(skb); | ||
|
|
||
| /* segment inner packet. */ | ||
| enc_features = skb->dev->hw_enc_features & netif_skb_features(skb); | ||
| segs = skb_mac_gso_segment(skb, enc_features); | ||
| if (!segs || IS_ERR(segs)) | ||
| goto out; | ||
|
|
||
| skb = segs; | ||
| tnl_hlen = skb_tnl_header_len(skb); | ||
| do { | ||
| __skb_push(skb, ghl); | ||
| if (csum) { | ||
| __be32 *pcsum; | ||
|
|
||
| if (skb_has_shared_frag(skb)) { | ||
| int err; | ||
|
|
||
| err = __skb_linearize(skb); | ||
| if (err) { | ||
| kfree_skb(segs); | ||
| segs = ERR_PTR(err); | ||
| goto out; | ||
| } | ||
| } | ||
|
|
||
| greh = (struct gre_base_hdr *)(skb->data); | ||
| pcsum = (__be32 *)(greh + 1); | ||
| *pcsum = 0; | ||
| *(__sum16 *)pcsum = csum_fold(skb_checksum(skb, 0, skb->len, 0)); | ||
| } | ||
| __skb_push(skb, tnl_hlen - ghl); | ||
|
|
||
| skb_reset_mac_header(skb); | ||
| skb_set_network_header(skb, mac_len); | ||
| skb->mac_len = mac_len; | ||
| skb->protocol = protocol; | ||
| } while ((skb = skb->next)); | ||
| out: | ||
| return segs; | ||
| } | ||
|
|
||
| static const struct net_offload gre_offload = { | ||
| .callbacks = { | ||
| .gso_send_check = gre_gso_send_check, | ||
| .gso_segment = gre_gso_segment, | ||
| }, | ||
| }; | ||
|
|
||
| int __init gre_offload_init(void) | ||
| { | ||
| return inet_add_offload(&gre_offload, IPPROTO_GRE); | ||
| } | ||
|
|
||
| void __exit gre_offload_exit(void) | ||
| { | ||
| inet_del_offload(&gre_offload, IPPROTO_GRE); | ||
| } |