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1fef8544bf
It makes more sense to clear NETIF_F_SG instead of set it when calling skb_segment() in sctp_gso_segment(), since SCTP GSO is using head_skb's fraglist, of which all frags are linear skbs. This will make SCTP GSO code more understandable. Suggested-by: Alexander Duyck <alexander.duyck@gmail.com> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
121 lines
2.6 KiB
C
121 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* sctp_offload - GRO/GSO Offloading for SCTP
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*
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* Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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#include <linux/socket.h>
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#include <linux/sctp.h>
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#include <linux/proc_fs.h>
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/kfifo.h>
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#include <linux/time.h>
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#include <net/net_namespace.h>
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#include <linux/skbuff.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/checksum.h>
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#include <net/protocol.h>
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static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
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{
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skb->ip_summed = CHECKSUM_NONE;
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skb->csum_not_inet = 0;
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/* csum and csum_start in GSO CB may be needed to do the UDP
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* checksum when it's a UDP tunneling packet.
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*/
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SKB_GSO_CB(skb)->csum = (__force __wsum)~0;
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SKB_GSO_CB(skb)->csum_start = skb_headroom(skb) + skb->len;
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return sctp_compute_cksum(skb, skb_transport_offset(skb));
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}
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static struct sk_buff *sctp_gso_segment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct sctphdr *sh;
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if (!skb_is_gso_sctp(skb))
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goto out;
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sh = sctp_hdr(skb);
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if (!pskb_may_pull(skb, sizeof(*sh)))
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goto out;
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__skb_pull(skb, sizeof(*sh));
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if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
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/* Packet is from an untrusted source, reset gso_segs. */
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struct skb_shared_info *pinfo = skb_shinfo(skb);
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struct sk_buff *frag_iter;
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pinfo->gso_segs = 0;
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if (skb->len != skb->data_len) {
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/* Means we have chunks in here too */
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pinfo->gso_segs++;
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}
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skb_walk_frags(skb, frag_iter)
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pinfo->gso_segs++;
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segs = NULL;
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goto out;
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}
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segs = skb_segment(skb, (features | NETIF_F_HW_CSUM) & ~NETIF_F_SG);
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if (IS_ERR(segs))
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goto out;
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/* All that is left is update SCTP CRC if necessary */
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if (!(features & NETIF_F_SCTP_CRC)) {
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for (skb = segs; skb; skb = skb->next) {
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if (skb->ip_summed == CHECKSUM_PARTIAL) {
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sh = sctp_hdr(skb);
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sh->checksum = sctp_gso_make_checksum(skb);
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}
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}
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}
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out:
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return segs;
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}
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static const struct net_offload sctp_offload = {
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.callbacks = {
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.gso_segment = sctp_gso_segment,
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},
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};
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static const struct net_offload sctp6_offload = {
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.callbacks = {
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.gso_segment = sctp_gso_segment,
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},
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};
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int __init sctp_offload_init(void)
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{
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int ret;
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ret = inet_add_offload(&sctp_offload, IPPROTO_SCTP);
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if (ret)
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goto out;
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ret = inet6_add_offload(&sctp6_offload, IPPROTO_SCTP);
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if (ret)
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goto ipv4;
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crc32c_csum_stub = &sctp_csum_ops;
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return ret;
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ipv4:
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inet_del_offload(&sctp_offload, IPPROTO_SCTP);
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out:
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return ret;
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}
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