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90017acc MRL |
1 | /* |
2 | * sctp_offload - GRO/GSO Offloading for SCTP | |
3 | * | |
4 | * Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
18 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/kprobes.h> | |
21 | #include <linux/socket.h> | |
22 | #include <linux/sctp.h> | |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/vmalloc.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/kfifo.h> | |
27 | #include <linux/time.h> | |
28 | #include <net/net_namespace.h> | |
29 | ||
30 | #include <linux/skbuff.h> | |
31 | #include <net/sctp/sctp.h> | |
32 | #include <net/sctp/checksum.h> | |
33 | #include <net/protocol.h> | |
34 | ||
35 | static __le32 sctp_gso_make_checksum(struct sk_buff *skb) | |
36 | { | |
37 | skb->ip_summed = CHECKSUM_NONE; | |
38 | return sctp_compute_cksum(skb, skb_transport_offset(skb)); | |
39 | } | |
40 | ||
41 | static struct sk_buff *sctp_gso_segment(struct sk_buff *skb, | |
42 | netdev_features_t features) | |
43 | { | |
44 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
45 | struct sctphdr *sh; | |
46 | ||
47 | sh = sctp_hdr(skb); | |
48 | if (!pskb_may_pull(skb, sizeof(*sh))) | |
49 | goto out; | |
50 | ||
51 | __skb_pull(skb, sizeof(*sh)); | |
52 | ||
53 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
54 | /* Packet is from an untrusted source, reset gso_segs. */ | |
55 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
56 | struct sk_buff *frag_iter; | |
57 | ||
58 | pinfo->gso_segs = 0; | |
59 | if (skb->len != skb->data_len) { | |
60 | /* Means we have chunks in here too */ | |
61 | pinfo->gso_segs++; | |
62 | } | |
63 | ||
64 | skb_walk_frags(skb, frag_iter) | |
65 | pinfo->gso_segs++; | |
66 | ||
67 | segs = NULL; | |
68 | goto out; | |
69 | } | |
70 | ||
71 | segs = skb_segment(skb, features | NETIF_F_HW_CSUM); | |
72 | if (IS_ERR(segs)) | |
73 | goto out; | |
74 | ||
75 | /* All that is left is update SCTP CRC if necessary */ | |
76 | if (!(features & NETIF_F_SCTP_CRC)) { | |
77 | for (skb = segs; skb; skb = skb->next) { | |
78 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
79 | sh = sctp_hdr(skb); | |
80 | sh->checksum = sctp_gso_make_checksum(skb); | |
81 | } | |
82 | } | |
83 | } | |
84 | ||
85 | out: | |
86 | return segs; | |
87 | } | |
88 | ||
89 | static const struct net_offload sctp_offload = { | |
90 | .callbacks = { | |
91 | .gso_segment = sctp_gso_segment, | |
92 | }, | |
93 | }; | |
94 | ||
95 | int __init sctp_offload_init(void) | |
96 | { | |
97 | return inet_add_offload(&sctp_offload, IPPROTO_SCTP); | |
98 | } |