From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- net/ipv6/esp6_offload.c | 418 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 418 insertions(+) create mode 100644 net/ipv6/esp6_offload.c (limited to 'net/ipv6/esp6_offload.c') diff --git a/net/ipv6/esp6_offload.c b/net/ipv6/esp6_offload.c new file mode 100644 index 000000000..87dbd53c2 --- /dev/null +++ b/net/ipv6/esp6_offload.c @@ -0,0 +1,418 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * IPV6 GSO/GRO offload support + * Linux INET implementation + * + * Copyright (C) 2016 secunet Security Networks AG + * Author: Steffen Klassert + * + * ESP GRO support + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static __u16 esp6_nexthdr_esp_offset(struct ipv6hdr *ipv6_hdr, int nhlen) +{ + int off = sizeof(struct ipv6hdr); + struct ipv6_opt_hdr *exthdr; + + if (likely(ipv6_hdr->nexthdr == NEXTHDR_ESP)) + return offsetof(struct ipv6hdr, nexthdr); + + while (off < nhlen) { + exthdr = (void *)ipv6_hdr + off; + if (exthdr->nexthdr == NEXTHDR_ESP) + return off; + + off += ipv6_optlen(exthdr); + } + + return 0; +} + +static struct sk_buff *esp6_gro_receive(struct list_head *head, + struct sk_buff *skb) +{ + int offset = skb_gro_offset(skb); + struct xfrm_offload *xo; + struct xfrm_state *x; + __be32 seq; + __be32 spi; + int nhoff; + int err; + + if (!pskb_pull(skb, offset)) + return NULL; + + if ((err = xfrm_parse_spi(skb, IPPROTO_ESP, &spi, &seq)) != 0) + goto out; + + xo = xfrm_offload(skb); + if (!xo || !(xo->flags & CRYPTO_DONE)) { + struct sec_path *sp = secpath_set(skb); + + if (!sp) + goto out; + + if (sp->len == XFRM_MAX_DEPTH) + goto out_reset; + + x = xfrm_state_lookup(dev_net(skb->dev), skb->mark, + (xfrm_address_t *)&ipv6_hdr(skb)->daddr, + spi, IPPROTO_ESP, AF_INET6); + if (!x) + goto out_reset; + + skb->mark = xfrm_smark_get(skb->mark, x); + + sp->xvec[sp->len++] = x; + sp->olen++; + + xo = xfrm_offload(skb); + if (!xo) + goto out_reset; + } + + xo->flags |= XFRM_GRO; + + nhoff = esp6_nexthdr_esp_offset(ipv6_hdr(skb), offset); + if (!nhoff) + goto out; + + IP6CB(skb)->nhoff = nhoff; + XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; + XFRM_SPI_SKB_CB(skb)->family = AF_INET6; + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); + XFRM_SPI_SKB_CB(skb)->seq = seq; + + /* We don't need to handle errors from xfrm_input, it does all + * the error handling and frees the resources on error. */ + xfrm_input(skb, IPPROTO_ESP, spi, -2); + + return ERR_PTR(-EINPROGRESS); +out_reset: + secpath_reset(skb); +out: + skb_push(skb, offset); + NAPI_GRO_CB(skb)->same_flow = 0; + NAPI_GRO_CB(skb)->flush = 1; + + return NULL; +} + +static void esp6_gso_encap(struct xfrm_state *x, struct sk_buff *skb) +{ + struct ip_esp_hdr *esph; + struct ipv6hdr *iph = ipv6_hdr(skb); + struct xfrm_offload *xo = xfrm_offload(skb); + u8 proto = iph->nexthdr; + + skb_push(skb, -skb_network_offset(skb)); + + if (x->outer_mode.encap == XFRM_MODE_TRANSPORT) { + __be16 frag; + + ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &proto, &frag); + } + + esph = ip_esp_hdr(skb); + *skb_mac_header(skb) = IPPROTO_ESP; + + esph->spi = x->id.spi; + esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low); + + xo->proto = proto; +} + +static struct sk_buff *xfrm6_tunnel_gso_segment(struct xfrm_state *x, + struct sk_buff *skb, + netdev_features_t features) +{ + __skb_push(skb, skb->mac_len); + return skb_mac_gso_segment(skb, features); +} + +static struct sk_buff *xfrm6_transport_gso_segment(struct xfrm_state *x, + struct sk_buff *skb, + netdev_features_t features) +{ + const struct net_offload *ops; + struct sk_buff *segs = ERR_PTR(-EINVAL); + struct xfrm_offload *xo = xfrm_offload(skb); + + skb->transport_header += x->props.header_len; + ops = rcu_dereference(inet6_offloads[xo->proto]); + if (likely(ops && ops->callbacks.gso_segment)) + segs = ops->callbacks.gso_segment(skb, features); + + return segs; +} + +static struct sk_buff *xfrm6_beet_gso_segment(struct xfrm_state *x, + struct sk_buff *skb, + netdev_features_t features) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + struct sk_buff *segs = ERR_PTR(-EINVAL); + const struct net_offload *ops; + u8 proto = xo->proto; + + skb->transport_header += x->props.header_len; + + if (x->sel.family != AF_INET6) { + skb->transport_header -= + (sizeof(struct ipv6hdr) - sizeof(struct iphdr)); + + if (proto == IPPROTO_BEETPH) { + struct ip_beet_phdr *ph = + (struct ip_beet_phdr *)skb->data; + + skb->transport_header += ph->hdrlen * 8; + proto = ph->nexthdr; + } else { + skb->transport_header -= IPV4_BEET_PHMAXLEN; + } + + if (proto == IPPROTO_TCP) + skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6; + } else { + __be16 frag; + + skb->transport_header += + ipv6_skip_exthdr(skb, 0, &proto, &frag); + } + + if (proto == IPPROTO_IPIP) + skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP6; + + __skb_pull(skb, skb_transport_offset(skb)); + ops = rcu_dereference(inet6_offloads[proto]); + if (likely(ops && ops->callbacks.gso_segment)) + segs = ops->callbacks.gso_segment(skb, features); + + return segs; +} + +static struct sk_buff *xfrm6_outer_mode_gso_segment(struct xfrm_state *x, + struct sk_buff *skb, + netdev_features_t features) +{ + switch (x->outer_mode.encap) { + case XFRM_MODE_TUNNEL: + return xfrm6_tunnel_gso_segment(x, skb, features); + case XFRM_MODE_TRANSPORT: + return xfrm6_transport_gso_segment(x, skb, features); + case XFRM_MODE_BEET: + return xfrm6_beet_gso_segment(x, skb, features); + } + + return ERR_PTR(-EOPNOTSUPP); +} + +static struct sk_buff *esp6_gso_segment(struct sk_buff *skb, + netdev_features_t features) +{ + struct xfrm_state *x; + struct ip_esp_hdr *esph; + struct crypto_aead *aead; + netdev_features_t esp_features = features; + struct xfrm_offload *xo = xfrm_offload(skb); + struct sec_path *sp; + + if (!xo) + return ERR_PTR(-EINVAL); + + if (!(skb_shinfo(skb)->gso_type & SKB_GSO_ESP)) + return ERR_PTR(-EINVAL); + + sp = skb_sec_path(skb); + x = sp->xvec[sp->len - 1]; + aead = x->data; + esph = ip_esp_hdr(skb); + + if (esph->spi != x->id.spi) + return ERR_PTR(-EINVAL); + + if (!pskb_may_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead))) + return ERR_PTR(-EINVAL); + + __skb_pull(skb, sizeof(*esph) + crypto_aead_ivsize(aead)); + + skb->encap_hdr_csum = 1; + + if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) + esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK | + NETIF_F_SCTP_CRC); + else if (!(features & NETIF_F_HW_ESP_TX_CSUM)) + esp_features = features & ~(NETIF_F_CSUM_MASK | + NETIF_F_SCTP_CRC); + + xo->flags |= XFRM_GSO_SEGMENT; + + return xfrm6_outer_mode_gso_segment(x, skb, esp_features); +} + +static int esp6_input_tail(struct xfrm_state *x, struct sk_buff *skb) +{ + struct crypto_aead *aead = x->data; + struct xfrm_offload *xo = xfrm_offload(skb); + + if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead))) + return -EINVAL; + + if (!(xo->flags & CRYPTO_DONE)) + skb->ip_summed = CHECKSUM_NONE; + + return esp6_input_done2(skb, 0); +} + +static int esp6_xmit(struct xfrm_state *x, struct sk_buff *skb, netdev_features_t features) +{ + int len; + int err; + int alen; + int blksize; + struct xfrm_offload *xo; + struct crypto_aead *aead; + struct esp_info esp; + bool hw_offload = true; + __u32 seq; + + esp.inplace = true; + + xo = xfrm_offload(skb); + + if (!xo) + return -EINVAL; + + if (!(features & NETIF_F_HW_ESP) || x->xso.dev != skb->dev) { + xo->flags |= CRYPTO_FALLBACK; + hw_offload = false; + } + + esp.proto = xo->proto; + + /* skb is pure payload to encrypt */ + + aead = x->data; + alen = crypto_aead_authsize(aead); + + esp.tfclen = 0; + /* XXX: Add support for tfc padding here. */ + + blksize = ALIGN(crypto_aead_blocksize(aead), 4); + esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize); + esp.plen = esp.clen - skb->len - esp.tfclen; + esp.tailen = esp.tfclen + esp.plen + alen; + + if (!hw_offload || (hw_offload && !skb_is_gso(skb))) { + esp.nfrags = esp6_output_head(x, skb, &esp); + if (esp.nfrags < 0) + return esp.nfrags; + } + + seq = xo->seq.low; + + esp.esph = ip_esp_hdr(skb); + esp.esph->spi = x->id.spi; + + skb_push(skb, -skb_network_offset(skb)); + + if (xo->flags & XFRM_GSO_SEGMENT) { + esp.esph->seq_no = htonl(seq); + + if (!skb_is_gso(skb)) + xo->seq.low++; + else + xo->seq.low += skb_shinfo(skb)->gso_segs; + } + + if (xo->seq.low < seq) + xo->seq.hi++; + + esp.seqno = cpu_to_be64(xo->seq.low + ((u64)xo->seq.hi << 32)); + + len = skb->len - sizeof(struct ipv6hdr); + if (len > IPV6_MAXPLEN) + len = 0; + + ipv6_hdr(skb)->payload_len = htons(len); + + if (hw_offload) { + if (!skb_ext_add(skb, SKB_EXT_SEC_PATH)) + return -ENOMEM; + + xo = xfrm_offload(skb); + if (!xo) + return -EINVAL; + + xo->flags |= XFRM_XMIT; + return 0; + } + + err = esp6_output_tail(x, skb, &esp); + if (err) + return err; + + secpath_reset(skb); + + if (skb_needs_linearize(skb, skb->dev->features) && + __skb_linearize(skb)) + return -ENOMEM; + return 0; +} + +static const struct net_offload esp6_offload = { + .callbacks = { + .gro_receive = esp6_gro_receive, + .gso_segment = esp6_gso_segment, + }, +}; + +static const struct xfrm_type_offload esp6_type_offload = { + .description = "ESP6 OFFLOAD", + .owner = THIS_MODULE, + .proto = IPPROTO_ESP, + .input_tail = esp6_input_tail, + .xmit = esp6_xmit, + .encap = esp6_gso_encap, +}; + +static int __init esp6_offload_init(void) +{ + if (xfrm_register_type_offload(&esp6_type_offload, AF_INET6) < 0) { + pr_info("%s: can't add xfrm type offload\n", __func__); + return -EAGAIN; + } + + return inet6_add_offload(&esp6_offload, IPPROTO_ESP); +} + +static void __exit esp6_offload_exit(void) +{ + xfrm_unregister_type_offload(&esp6_type_offload, AF_INET6); + inet6_del_offload(&esp6_offload, IPPROTO_ESP); +} + +module_init(esp6_offload_init); +module_exit(esp6_offload_exit); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Steffen Klassert "); +MODULE_ALIAS_XFRM_OFFLOAD_TYPE(AF_INET6, XFRM_PROTO_ESP); +MODULE_DESCRIPTION("IPV6 GSO/GRO offload support"); -- cgit v1.2.3