Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * sctp_offload - GRO/GSO Offloading for SCTP
4 *
5 * Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
6 */
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#include <net/gso.h>
26
27static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
28{
29 skb->ip_summed = CHECKSUM_NONE;
30 skb->csum_not_inet = 0;
31 /* csum and csum_start in GSO CB may be needed to do the UDP
32 * checksum when it's a UDP tunneling packet.
33 */
34 SKB_GSO_CB(skb)->csum = (__force __wsum)~0;
35 SKB_GSO_CB(skb)->csum_start = skb_headroom(skb) + skb->len;
36 return sctp_compute_cksum(skb, skb_transport_offset(skb));
37}
38
39static struct sk_buff *sctp_gso_segment(struct sk_buff *skb,
40 netdev_features_t features)
41{
42 struct sk_buff *segs = ERR_PTR(-EINVAL);
43 struct sctphdr *sh;
44
45 if (!skb_is_gso_sctp(skb))
46 goto out;
47
48 sh = sctp_hdr(skb);
49 if (!pskb_may_pull(skb, sizeof(*sh)))
50 goto out;
51
52 __skb_pull(skb, sizeof(*sh));
53
54 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
55 /* Packet is from an untrusted source, reset gso_segs. */
56 struct skb_shared_info *pinfo = skb_shinfo(skb);
57 struct sk_buff *frag_iter;
58
59 pinfo->gso_segs = 0;
60 if (skb->len != skb->data_len) {
61 /* Means we have chunks in here too */
62 pinfo->gso_segs++;
63 }
64
65 skb_walk_frags(skb, frag_iter)
66 pinfo->gso_segs++;
67
68 segs = NULL;
69 goto out;
70 }
71
72 segs = skb_segment(skb, (features | NETIF_F_HW_CSUM) & ~NETIF_F_SG);
73 if (IS_ERR(segs))
74 goto out;
75
76 /* All that is left is update SCTP CRC if necessary */
77 if (!(features & NETIF_F_SCTP_CRC)) {
78 for (skb = segs; skb; skb = skb->next) {
79 if (skb->ip_summed == CHECKSUM_PARTIAL) {
80 sh = sctp_hdr(skb);
81 sh->checksum = sctp_gso_make_checksum(skb);
82 }
83 }
84 }
85
86out:
87 return segs;
88}
89
90static const struct net_offload sctp_offload = {
91 .callbacks = {
92 .gso_segment = sctp_gso_segment,
93 },
94};
95
96static const struct net_offload sctp6_offload = {
97 .callbacks = {
98 .gso_segment = sctp_gso_segment,
99 },
100};
101
102int __init sctp_offload_init(void)
103{
104 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
114 crc32c_csum_stub = &sctp_csum_ops;
115 return ret;
116
117ipv4:
118 inet_del_offload(&sctp_offload, IPPROTO_SCTP);
119out:
120 return ret;
121}
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
35static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
36{
37 skb->ip_summed = CHECKSUM_NONE;
38 skb->csum_not_inet = 0;
39 return sctp_compute_cksum(skb, skb_transport_offset(skb));
40}
41
42static struct sk_buff *sctp_gso_segment(struct sk_buff *skb,
43 netdev_features_t features)
44{
45 struct sk_buff *segs = ERR_PTR(-EINVAL);
46 struct sctphdr *sh;
47
48 if (!skb_is_gso_sctp(skb))
49 goto out;
50
51 sh = sctp_hdr(skb);
52 if (!pskb_may_pull(skb, sizeof(*sh)))
53 goto out;
54
55 __skb_pull(skb, sizeof(*sh));
56
57 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
58 /* Packet is from an untrusted source, reset gso_segs. */
59 struct skb_shared_info *pinfo = skb_shinfo(skb);
60 struct sk_buff *frag_iter;
61
62 pinfo->gso_segs = 0;
63 if (skb->len != skb->data_len) {
64 /* Means we have chunks in here too */
65 pinfo->gso_segs++;
66 }
67
68 skb_walk_frags(skb, frag_iter)
69 pinfo->gso_segs++;
70
71 segs = NULL;
72 goto out;
73 }
74
75 segs = skb_segment(skb, features | NETIF_F_HW_CSUM | NETIF_F_SG);
76 if (IS_ERR(segs))
77 goto out;
78
79 /* All that is left is update SCTP CRC if necessary */
80 if (!(features & NETIF_F_SCTP_CRC)) {
81 for (skb = segs; skb; skb = skb->next) {
82 if (skb->ip_summed == CHECKSUM_PARTIAL) {
83 sh = sctp_hdr(skb);
84 sh->checksum = sctp_gso_make_checksum(skb);
85 }
86 }
87 }
88
89out:
90 return segs;
91}
92
93static const struct net_offload sctp_offload = {
94 .callbacks = {
95 .gso_segment = sctp_gso_segment,
96 },
97};
98
99static const struct net_offload sctp6_offload = {
100 .callbacks = {
101 .gso_segment = sctp_gso_segment,
102 },
103};
104
105static const struct skb_checksum_ops crc32c_csum_ops = {
106 .update = sctp_csum_update,
107 .combine = sctp_csum_combine,
108};
109
110int __init sctp_offload_init(void)
111{
112 int ret;
113
114 ret = inet_add_offload(&sctp_offload, IPPROTO_SCTP);
115 if (ret)
116 goto out;
117
118 ret = inet6_add_offload(&sctp6_offload, IPPROTO_SCTP);
119 if (ret)
120 goto ipv4;
121
122 crc32c_csum_stub = &crc32c_csum_ops;
123 return ret;
124
125ipv4:
126 inet_del_offload(&sctp_offload, IPPROTO_SCTP);
127out:
128 return ret;
129}