^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * sctp_offload - GRO/GSO Offloading for SCTP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2015, Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kprobes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/socket.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sctp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/proc_fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/kfifo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <net/net_namespace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <net/sctp/sctp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <net/sctp/checksum.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static __le32 sctp_gso_make_checksum(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) skb->ip_summed = CHECKSUM_NONE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) skb->csum_not_inet = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) gso_reset_checksum(skb, ~0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) return sctp_compute_cksum(skb, skb_transport_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static struct sk_buff *sctp_gso_segment(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) netdev_features_t features)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct sk_buff *segs = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct sctphdr *sh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (!skb_is_gso_sctp(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) sh = sctp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) if (!pskb_may_pull(skb, sizeof(*sh)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) __skb_pull(skb, sizeof(*sh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* Packet is from an untrusted source, reset gso_segs. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct skb_shared_info *pinfo = skb_shinfo(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct sk_buff *frag_iter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) pinfo->gso_segs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (skb->len != skb->data_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* Means we have chunks in here too */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) pinfo->gso_segs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) skb_walk_frags(skb, frag_iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) pinfo->gso_segs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) segs = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) segs = skb_segment(skb, features | NETIF_F_HW_CSUM | NETIF_F_SG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (IS_ERR(segs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) /* All that is left is update SCTP CRC if necessary */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (!(features & NETIF_F_SCTP_CRC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) for (skb = segs; skb; skb = skb->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (skb->ip_summed == CHECKSUM_PARTIAL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) sh = sctp_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) sh->checksum = sctp_gso_make_checksum(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static const struct net_offload sctp_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) .callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) .gso_segment = sctp_gso_segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static const struct net_offload sctp6_offload = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .callbacks = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .gso_segment = sctp_gso_segment,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) int __init sctp_offload_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) ret = inet_add_offload(&sctp_offload, IPPROTO_SCTP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) ret = inet6_add_offload(&sctp6_offload, IPPROTO_SCTP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) goto ipv4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) crc32c_csum_stub = &sctp_csum_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) ipv4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) inet_del_offload(&sctp_offload, IPPROTO_SCTP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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