projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 0d89d203 SH |
1 | /* |
| 2 | * MPLS GSO Support | |
| 3 | * | |
| 4 | * Authors: Simon Horman (horms@verge.net.au) | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public License | |
| 8 | * as published by the Free Software Foundation; either version | |
| 9 | * 2 of the License, or (at your option) any later version. | |
| 10 | * | |
| 11 | * Based on: GSO portions of net/ipv4/gre.c | |
| 12 | */ | |
| 13 | ||
| 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
| 15 | ||
| 16 | #include <linux/err.h> | |
| 17 | #include <linux/module.h> | |
| 18 | #include <linux/netdev_features.h> | |
| 19 | #include <linux/netdevice.h> | |
| 20 | #include <linux/skbuff.h> | |
| 21 | ||
| 22 | static struct sk_buff *mpls_gso_segment(struct sk_buff *skb, | |
| 23 | netdev_features_t features) | |
| 24 | { | |
| 25 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
| 26 | netdev_features_t mpls_features; | |
| 27 | __be16 mpls_protocol; | |
| 28 | ||
| 29 | if (unlikely(skb_shinfo(skb)->gso_type & | |
| 30 | ~(SKB_GSO_TCPV4 | | |
| 31 | SKB_GSO_TCPV6 | | |
| 32 | SKB_GSO_UDP | | |
| 33 | SKB_GSO_DODGY | | |
| 34 | SKB_GSO_TCP_ECN | | |
| 35 | SKB_GSO_GRE | | |
| cb32f511 | 36 | SKB_GSO_IPIP | |
| 0d89d203 SH |
37 | SKB_GSO_MPLS))) |
| 38 | goto out; | |
| 39 | ||
| 40 | /* Setup inner SKB. */ | |
| 41 | mpls_protocol = skb->protocol; | |
| 42 | skb->protocol = skb->inner_protocol; | |
| 43 | ||
| 44 | /* Push back the mac header that skb_mac_gso_segment() has pulled. | |
| 45 | * It will be re-pulled by the call to skb_mac_gso_segment() below | |
| 46 | */ | |
| 47 | __skb_push(skb, skb->mac_len); | |
| 48 | ||
| 49 | /* Segment inner packet. */ | |
| 50 | mpls_features = skb->dev->mpls_features & netif_skb_features(skb); | |
| 51 | segs = skb_mac_gso_segment(skb, mpls_features); | |
| 52 | ||
| 53 | ||
| 54 | /* Restore outer protocol. */ | |
| 55 | skb->protocol = mpls_protocol; | |
| 56 | ||
| 57 | /* Re-pull the mac header that the call to skb_mac_gso_segment() | |
| 58 | * above pulled. It will be re-pushed after returning | |
| 59 | * skb_mac_gso_segment(), an indirect caller of this function. | |
| 60 | */ | |
| 61 | __skb_push(skb, skb->data - skb_mac_header(skb)); | |
| 62 | ||
| 63 | out: | |
| 64 | return segs; | |
| 65 | } | |
| 66 | ||
| 67 | static int mpls_gso_send_check(struct sk_buff *skb) | |
| 68 | { | |
| 69 | return 0; | |
| 70 | } | |
| 71 | ||
| 72 | static struct packet_offload mpls_mc_offload = { | |
| 73 | .type = cpu_to_be16(ETH_P_MPLS_MC), | |
| 74 | .callbacks = { | |
| 75 | .gso_send_check = mpls_gso_send_check, | |
| 76 | .gso_segment = mpls_gso_segment, | |
| 77 | }, | |
| 78 | }; | |
| 79 | ||
| 80 | static struct packet_offload mpls_uc_offload = { | |
| 81 | .type = cpu_to_be16(ETH_P_MPLS_UC), | |
| 82 | .callbacks = { | |
| 83 | .gso_send_check = mpls_gso_send_check, | |
| 84 | .gso_segment = mpls_gso_segment, | |
| 85 | }, | |
| 86 | }; | |
| 87 | ||
| 88 | static int __init mpls_gso_init(void) | |
| 89 | { | |
| 90 | pr_info("MPLS GSO support\n"); | |
| 91 | ||
| 92 | dev_add_offload(&mpls_uc_offload); | |
| 93 | dev_add_offload(&mpls_mc_offload); | |
| 94 | ||
| 95 | return 0; | |
| 96 | } | |
| 97 | ||
| 98 | static void __exit mpls_gso_exit(void) | |
| 99 | { | |
| 100 | dev_remove_offload(&mpls_uc_offload); | |
| 101 | dev_remove_offload(&mpls_mc_offload); | |
| 102 | } | |
| 103 | ||
| 104 | module_init(mpls_gso_init); | |
| 105 | module_exit(mpls_gso_exit); | |
| 106 | ||
| 107 | MODULE_DESCRIPTION("MPLS GSO support"); | |
| 108 | MODULE_AUTHOR("Simon Horman (horms@verge.net.au)"); | |
| 109 | MODULE_LICENSE("GPL"); |