2 * sctp_offload - GRO/GSO Offloading for SCTP
4 * Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
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.
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.
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
30 #include <linux/skbuff.h>
31 #include <net/sctp/sctp.h>
32 #include <net/sctp/checksum.h>
33 #include <net/protocol.h>
35 static __le32
sctp_gso_make_checksum(struct sk_buff
*skb
)
37 skb
->ip_summed
= CHECKSUM_NONE
;
38 return sctp_compute_cksum(skb
, skb_transport_offset(skb
));
41 static struct sk_buff
*sctp_gso_segment(struct sk_buff
*skb
,
42 netdev_features_t features
)
44 struct sk_buff
*segs
= ERR_PTR(-EINVAL
);
48 if (!pskb_may_pull(skb
, sizeof(*sh
)))
51 __skb_pull(skb
, sizeof(*sh
));
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
;
59 if (skb
->len
!= skb
->data_len
) {
60 /* Means we have chunks in here too */
64 skb_walk_frags(skb
, frag_iter
)
71 segs
= skb_segment(skb
, features
| NETIF_F_HW_CSUM
);
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
) {
80 sh
->checksum
= sctp_gso_make_checksum(skb
);
89 static const struct net_offload sctp_offload
= {
91 .gso_segment
= sctp_gso_segment
,
95 static const struct net_offload sctp6_offload
= {
97 .gso_segment
= sctp_gso_segment
,
101 int __init
sctp_offload_init(void)
105 ret
= inet_add_offload(&sctp_offload
, IPPROTO_SCTP
);
109 ret
= inet6_add_offload(&sctp6_offload
, IPPROTO_SCTP
);
116 inet_del_offload(&sctp_offload
, IPPROTO_SCTP
);