blob: 2cae7440349c3c891c549650cb58da2b9b3ef820 [file] [log] [blame]
Thomas Gleixnerc942fdd2019-05-27 08:55:06 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -03002/*
3 * sctp_offload - GRO/GSO Offloading for SCTP
4 *
5 * Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -03006 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/kernel.h>
11#include <linux/kprobes.h>
12#include <linux/socket.h>
13#include <linux/sctp.h>
14#include <linux/proc_fs.h>
15#include <linux/vmalloc.h>
16#include <linux/module.h>
17#include <linux/kfifo.h>
18#include <linux/time.h>
19#include <net/net_namespace.h>
20
21#include <linux/skbuff.h>
22#include <net/sctp/sctp.h>
23#include <net/sctp/checksum.h>
24#include <net/protocol.h>
25
26static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
27{
28 skb->ip_summed = CHECKSUM_NONE;
Davide Carattidba00302017-05-18 15:44:40 +020029 skb->csum_not_inet = 0;
Xin Longfc228ab2019-02-12 18:47:30 +080030 gso_reset_checksum(skb, ~0);
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -030031 return sctp_compute_cksum(skb, skb_transport_offset(skb));
32}
33
34static struct sk_buff *sctp_gso_segment(struct sk_buff *skb,
35 netdev_features_t features)
36{
37 struct sk_buff *segs = ERR_PTR(-EINVAL);
38 struct sctphdr *sh;
39
Daniel Axtens1dd27cd2018-03-09 14:06:09 +110040 if (!skb_is_gso_sctp(skb))
Willem de Bruijn121d57a2018-01-19 09:29:18 -050041 goto out;
42
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -030043 sh = sctp_hdr(skb);
44 if (!pskb_may_pull(skb, sizeof(*sh)))
45 goto out;
46
47 __skb_pull(skb, sizeof(*sh));
48
49 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
50 /* Packet is from an untrusted source, reset gso_segs. */
51 struct skb_shared_info *pinfo = skb_shinfo(skb);
52 struct sk_buff *frag_iter;
53
54 pinfo->gso_segs = 0;
55 if (skb->len != skb->data_len) {
56 /* Means we have chunks in here too */
57 pinfo->gso_segs++;
58 }
59
60 skb_walk_frags(skb, frag_iter)
61 pinfo->gso_segs++;
62
63 segs = NULL;
64 goto out;
65 }
66
Xin Long5207f392017-01-24 14:05:16 +080067 segs = skb_segment(skb, features | NETIF_F_HW_CSUM | NETIF_F_SG);
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -030068 if (IS_ERR(segs))
69 goto out;
70
71 /* All that is left is update SCTP CRC if necessary */
72 if (!(features & NETIF_F_SCTP_CRC)) {
73 for (skb = segs; skb; skb = skb->next) {
74 if (skb->ip_summed == CHECKSUM_PARTIAL) {
75 sh = sctp_hdr(skb);
76 sh->checksum = sctp_gso_make_checksum(skb);
77 }
78 }
79 }
80
81out:
82 return segs;
83}
84
85static const struct net_offload sctp_offload = {
86 .callbacks = {
87 .gso_segment = sctp_gso_segment,
88 },
89};
90
Marcelo Ricardo Leitnerc5c4e452016-07-15 16:40:02 -030091static const struct net_offload sctp6_offload = {
92 .callbacks = {
93 .gso_segment = sctp_gso_segment,
94 },
95};
96
Davide Caratti96178132017-05-18 15:44:37 +020097static const struct skb_checksum_ops crc32c_csum_ops = {
98 .update = sctp_csum_update,
99 .combine = sctp_csum_combine,
100};
101
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -0300102int __init sctp_offload_init(void)
103{
Marcelo Ricardo Leitnerc5c4e452016-07-15 16:40:02 -0300104 int ret;
105
106 ret = inet_add_offload(&sctp_offload, IPPROTO_SCTP);
107 if (ret)
108 goto out;
109
110 ret = inet6_add_offload(&sctp6_offload, IPPROTO_SCTP);
111 if (ret)
112 goto ipv4;
113
Davide Caratti96178132017-05-18 15:44:37 +0200114 crc32c_csum_stub = &crc32c_csum_ops;
Marcelo Ricardo Leitnerc5c4e452016-07-15 16:40:02 -0300115 return ret;
116
117ipv4:
118 inet_del_offload(&sctp_offload, IPPROTO_SCTP);
119out:
120 return ret;
Marcelo Ricardo Leitner90017ac2016-06-02 15:05:43 -0300121}