Commit | Line | Data |
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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
90017acc MRL |
2 | /* |
3 | * sctp_offload - GRO/GSO Offloading for SCTP | |
4 | * | |
5 | * Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> | |
90017acc MRL |
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> | |
d457a0e3 | 25 | #include <net/gso.h> |
90017acc MRL |
26 | |
27 | static __le32 sctp_gso_make_checksum(struct sk_buff *skb) | |
28 | { | |
29 | skb->ip_summed = CHECKSUM_NONE; | |
dba00306 | 30 | skb->csum_not_inet = 0; |
527beb8e XL |
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; | |
90017acc MRL |
36 | return sctp_compute_cksum(skb, skb_transport_offset(skb)); |
37 | } | |
38 | ||
39 | static 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 | ||
1dd27cde | 45 | if (!skb_is_gso_sctp(skb)) |
121d57af WB |
46 | goto out; |
47 | ||
90017acc MRL |
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 | ||
1fef8544 | 72 | segs = skb_segment(skb, (features | NETIF_F_HW_CSUM) & ~NETIF_F_SG); |
90017acc MRL |
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 | ||
86 | out: | |
87 | return segs; | |
88 | } | |
89 | ||
90 | static const struct net_offload sctp_offload = { | |
91 | .callbacks = { | |
92 | .gso_segment = sctp_gso_segment, | |
93 | }, | |
94 | }; | |
95 | ||
c5c4e45c MRL |
96 | static const struct net_offload sctp6_offload = { |
97 | .callbacks = { | |
98 | .gso_segment = sctp_gso_segment, | |
99 | }, | |
100 | }; | |
101 | ||
90017acc MRL |
102 | int __init sctp_offload_init(void) |
103 | { | |
c5c4e45c MRL |
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 | ||
c3e933a5 | 114 | crc32c_csum_stub = &sctp_csum_ops; |
c5c4e45c MRL |
115 | return ret; |
116 | ||
117 | ipv4: | |
118 | inet_del_offload(&sctp_offload, IPPROTO_SCTP); | |
119 | out: | |
120 | return ret; | |
90017acc | 121 | } |