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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; | |
dba00306 | 38 | skb->csum_not_inet = 0; |
cc227a94 | 39 | gso_reset_checksum(skb, ~0); |
90017acc MRL |
40 | return sctp_compute_cksum(skb, skb_transport_offset(skb)); |
41 | } | |
42 | ||
43 | static struct sk_buff *sctp_gso_segment(struct sk_buff *skb, | |
44 | netdev_features_t features) | |
45 | { | |
46 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
47 | struct sctphdr *sh; | |
48 | ||
121d57af WB |
49 | if (!(skb_shinfo(skb)->gso_type & SKB_GSO_SCTP)) |
50 | goto out; | |
51 | ||
90017acc MRL |
52 | sh = sctp_hdr(skb); |
53 | if (!pskb_may_pull(skb, sizeof(*sh))) | |
54 | goto out; | |
55 | ||
56 | __skb_pull(skb, sizeof(*sh)); | |
57 | ||
58 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
59 | /* Packet is from an untrusted source, reset gso_segs. */ | |
60 | struct skb_shared_info *pinfo = skb_shinfo(skb); | |
61 | struct sk_buff *frag_iter; | |
62 | ||
63 | pinfo->gso_segs = 0; | |
64 | if (skb->len != skb->data_len) { | |
65 | /* Means we have chunks in here too */ | |
66 | pinfo->gso_segs++; | |
67 | } | |
68 | ||
69 | skb_walk_frags(skb, frag_iter) | |
70 | pinfo->gso_segs++; | |
71 | ||
72 | segs = NULL; | |
73 | goto out; | |
74 | } | |
75 | ||
5207f399 | 76 | segs = skb_segment(skb, features | NETIF_F_HW_CSUM | NETIF_F_SG); |
90017acc MRL |
77 | if (IS_ERR(segs)) |
78 | goto out; | |
79 | ||
80 | /* All that is left is update SCTP CRC if necessary */ | |
81 | if (!(features & NETIF_F_SCTP_CRC)) { | |
82 | for (skb = segs; skb; skb = skb->next) { | |
83 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
84 | sh = sctp_hdr(skb); | |
85 | sh->checksum = sctp_gso_make_checksum(skb); | |
86 | } | |
87 | } | |
88 | } | |
89 | ||
90 | out: | |
91 | return segs; | |
92 | } | |
93 | ||
94 | static const struct net_offload sctp_offload = { | |
95 | .callbacks = { | |
96 | .gso_segment = sctp_gso_segment, | |
97 | }, | |
98 | }; | |
99 | ||
c5c4e45c MRL |
100 | static const struct net_offload sctp6_offload = { |
101 | .callbacks = { | |
102 | .gso_segment = sctp_gso_segment, | |
103 | }, | |
104 | }; | |
105 | ||
9617813d DC |
106 | static const struct skb_checksum_ops crc32c_csum_ops = { |
107 | .update = sctp_csum_update, | |
108 | .combine = sctp_csum_combine, | |
109 | }; | |
110 | ||
90017acc MRL |
111 | int __init sctp_offload_init(void) |
112 | { | |
c5c4e45c MRL |
113 | int ret; |
114 | ||
115 | ret = inet_add_offload(&sctp_offload, IPPROTO_SCTP); | |
116 | if (ret) | |
117 | goto out; | |
118 | ||
119 | ret = inet6_add_offload(&sctp6_offload, IPPROTO_SCTP); | |
120 | if (ret) | |
121 | goto ipv4; | |
122 | ||
9617813d | 123 | crc32c_csum_stub = &crc32c_csum_ops; |
c5c4e45c MRL |
124 | return ret; |
125 | ||
126 | ipv4: | |
127 | inet_del_offload(&sctp_offload, IPPROTO_SCTP); | |
128 | out: | |
129 | return ret; | |
90017acc | 130 | } |