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/*
* sctp_offload - GRO/GSO Offloading for SCTP
*
* Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/kprobes.h>
#include <linux/socket.h>
#include <linux/sctp.h>
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/kfifo.h>
#include <linux/time.h>
#include <net/net_namespace.h>
#include <linux/skbuff.h>
#include <net/sctp/sctp.h>
#include <net/sctp/checksum.h>
#include <net/protocol.h>
static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
{
skb->ip_summed = CHECKSUM_NONE;
gso_reset_checksum(skb, ~0);
return sctp_compute_cksum(skb, skb_transport_offset(skb));
}
static struct sk_buff *sctp_gso_segment(struct sk_buff *skb,
netdev_features_t features)
{
struct sk_buff *segs = ERR_PTR(-EINVAL);
struct sctphdr *sh;
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_SCTP))
goto out;
sh = sctp_hdr(skb);
if (!pskb_may_pull(skb, sizeof(*sh)))
goto out;
__skb_pull(skb, sizeof(*sh));
if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
/* Packet is from an untrusted source, reset gso_segs. */
struct skb_shared_info *pinfo = skb_shinfo(skb);
struct sk_buff *frag_iter;
pinfo->gso_segs = 0;
if (skb->len != skb->data_len) {
/* Means we have chunks in here too */
pinfo->gso_segs++;
}
skb_walk_frags(skb, frag_iter)
pinfo->gso_segs++;
segs = NULL;
goto out;
}
segs = skb_segment(skb, features | NETIF_F_HW_CSUM | NETIF_F_SG);
if (IS_ERR(segs))
goto out;
/* All that is left is update SCTP CRC if necessary */
if (!(features & NETIF_F_SCTP_CRC)) {
for (skb = segs; skb; skb = skb->next) {
if (skb->ip_summed == CHECKSUM_PARTIAL) {
sh = sctp_hdr(skb);
sh->checksum = sctp_gso_make_checksum(skb);
}
}
}
out:
return segs;
}
static const struct net_offload sctp_offload = {
.callbacks = {
.gso_segment = sctp_gso_segment,
},
};
static const struct net_offload sctp6_offload = {
.callbacks = {
.gso_segment = sctp_gso_segment,
},
};
int __init sctp_offload_init(void)
{
int ret;
ret = inet_add_offload(&sctp_offload, IPPROTO_SCTP);
if (ret)
goto out;
ret = inet6_add_offload(&sctp6_offload, IPPROTO_SCTP);
if (ret)
goto ipv4;
return ret;
ipv4:
inet_del_offload(&sctp_offload, IPPROTO_SCTP);
out:
return ret;
}
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