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89edf40220
Since mlx5 supports UDP encapsulation in packet offload, change the XFRM core to allow users to configure it. Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Acked-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
540 lines
13 KiB
C
540 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* xfrm_device.c - IPsec device offloading code.
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*
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* Copyright (c) 2015 secunet Security Networks AG
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*
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* Author:
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* Steffen Klassert <steffen.klassert@secunet.com>
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*/
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <net/dst.h>
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#include <net/gso.h>
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#include <net/xfrm.h>
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#include <linux/notifier.h>
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#ifdef CONFIG_XFRM_OFFLOAD
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static void __xfrm_transport_prep(struct xfrm_state *x, struct sk_buff *skb,
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unsigned int hsize)
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{
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struct xfrm_offload *xo = xfrm_offload(skb);
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skb_reset_mac_len(skb);
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if (xo->flags & XFRM_GSO_SEGMENT)
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skb->transport_header -= x->props.header_len;
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pskb_pull(skb, skb_transport_offset(skb) + x->props.header_len);
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}
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static void __xfrm_mode_tunnel_prep(struct xfrm_state *x, struct sk_buff *skb,
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unsigned int hsize)
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{
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struct xfrm_offload *xo = xfrm_offload(skb);
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if (xo->flags & XFRM_GSO_SEGMENT)
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skb->transport_header = skb->network_header + hsize;
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skb_reset_mac_len(skb);
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pskb_pull(skb, skb->mac_len + x->props.header_len);
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}
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static void __xfrm_mode_beet_prep(struct xfrm_state *x, struct sk_buff *skb,
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unsigned int hsize)
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{
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struct xfrm_offload *xo = xfrm_offload(skb);
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int phlen = 0;
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if (xo->flags & XFRM_GSO_SEGMENT)
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skb->transport_header = skb->network_header + hsize;
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skb_reset_mac_len(skb);
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if (x->sel.family != AF_INET6) {
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phlen = IPV4_BEET_PHMAXLEN;
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if (x->outer_mode.family == AF_INET6)
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phlen += sizeof(struct ipv6hdr) - sizeof(struct iphdr);
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}
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pskb_pull(skb, skb->mac_len + hsize + (x->props.header_len - phlen));
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}
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/* Adjust pointers into the packet when IPsec is done at layer2 */
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static void xfrm_outer_mode_prep(struct xfrm_state *x, struct sk_buff *skb)
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{
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switch (x->outer_mode.encap) {
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case XFRM_MODE_TUNNEL:
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if (x->outer_mode.family == AF_INET)
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return __xfrm_mode_tunnel_prep(x, skb,
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sizeof(struct iphdr));
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if (x->outer_mode.family == AF_INET6)
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return __xfrm_mode_tunnel_prep(x, skb,
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sizeof(struct ipv6hdr));
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break;
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case XFRM_MODE_TRANSPORT:
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if (x->outer_mode.family == AF_INET)
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return __xfrm_transport_prep(x, skb,
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sizeof(struct iphdr));
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if (x->outer_mode.family == AF_INET6)
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return __xfrm_transport_prep(x, skb,
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sizeof(struct ipv6hdr));
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break;
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case XFRM_MODE_BEET:
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if (x->outer_mode.family == AF_INET)
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return __xfrm_mode_beet_prep(x, skb,
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sizeof(struct iphdr));
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if (x->outer_mode.family == AF_INET6)
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return __xfrm_mode_beet_prep(x, skb,
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sizeof(struct ipv6hdr));
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break;
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case XFRM_MODE_ROUTEOPTIMIZATION:
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case XFRM_MODE_IN_TRIGGER:
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break;
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}
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}
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static inline bool xmit_xfrm_check_overflow(struct sk_buff *skb)
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{
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struct xfrm_offload *xo = xfrm_offload(skb);
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__u32 seq = xo->seq.low;
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seq += skb_shinfo(skb)->gso_segs;
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if (unlikely(seq < xo->seq.low))
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return true;
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return false;
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}
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struct sk_buff *validate_xmit_xfrm(struct sk_buff *skb, netdev_features_t features, bool *again)
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{
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int err;
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unsigned long flags;
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struct xfrm_state *x;
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struct softnet_data *sd;
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struct sk_buff *skb2, *nskb, *pskb = NULL;
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netdev_features_t esp_features = features;
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struct xfrm_offload *xo = xfrm_offload(skb);
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struct net_device *dev = skb->dev;
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struct sec_path *sp;
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if (!xo || (xo->flags & XFRM_XMIT))
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return skb;
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if (!(features & NETIF_F_HW_ESP))
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esp_features = features & ~(NETIF_F_SG | NETIF_F_CSUM_MASK);
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sp = skb_sec_path(skb);
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x = sp->xvec[sp->len - 1];
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if (xo->flags & XFRM_GRO || x->xso.dir == XFRM_DEV_OFFLOAD_IN)
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return skb;
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/* The packet was sent to HW IPsec packet offload engine,
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* but to wrong device. Drop the packet, so it won't skip
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* XFRM stack.
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*/
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if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET && x->xso.dev != dev) {
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kfree_skb(skb);
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dev_core_stats_tx_dropped_inc(dev);
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return NULL;
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}
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/* This skb was already validated on the upper/virtual dev */
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if ((x->xso.dev != dev) && (x->xso.real_dev == dev))
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return skb;
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local_irq_save(flags);
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sd = this_cpu_ptr(&softnet_data);
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err = !skb_queue_empty(&sd->xfrm_backlog);
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local_irq_restore(flags);
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if (err) {
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*again = true;
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return skb;
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}
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if (skb_is_gso(skb) && (unlikely(x->xso.dev != dev) ||
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unlikely(xmit_xfrm_check_overflow(skb)))) {
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struct sk_buff *segs;
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/* Packet got rerouted, fixup features and segment it. */
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esp_features = esp_features & ~(NETIF_F_HW_ESP | NETIF_F_GSO_ESP);
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segs = skb_gso_segment(skb, esp_features);
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if (IS_ERR(segs)) {
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kfree_skb(skb);
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dev_core_stats_tx_dropped_inc(dev);
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return NULL;
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} else {
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consume_skb(skb);
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skb = segs;
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}
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}
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if (!skb->next) {
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esp_features |= skb->dev->gso_partial_features;
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xfrm_outer_mode_prep(x, skb);
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xo->flags |= XFRM_DEV_RESUME;
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err = x->type_offload->xmit(x, skb, esp_features);
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if (err) {
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if (err == -EINPROGRESS)
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return NULL;
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XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
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kfree_skb(skb);
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return NULL;
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}
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skb_push(skb, skb->data - skb_mac_header(skb));
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return skb;
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}
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skb_list_walk_safe(skb, skb2, nskb) {
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esp_features |= skb->dev->gso_partial_features;
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skb_mark_not_on_list(skb2);
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xo = xfrm_offload(skb2);
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xo->flags |= XFRM_DEV_RESUME;
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xfrm_outer_mode_prep(x, skb2);
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err = x->type_offload->xmit(x, skb2, esp_features);
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if (!err) {
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skb2->next = nskb;
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} else if (err != -EINPROGRESS) {
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XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
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skb2->next = nskb;
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kfree_skb_list(skb2);
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return NULL;
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} else {
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if (skb == skb2)
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skb = nskb;
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else
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pskb->next = nskb;
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continue;
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}
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skb_push(skb2, skb2->data - skb_mac_header(skb2));
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pskb = skb2;
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}
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return skb;
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}
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EXPORT_SYMBOL_GPL(validate_xmit_xfrm);
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int xfrm_dev_state_add(struct net *net, struct xfrm_state *x,
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struct xfrm_user_offload *xuo,
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struct netlink_ext_ack *extack)
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{
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int err;
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struct dst_entry *dst;
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struct net_device *dev;
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struct xfrm_dev_offload *xso = &x->xso;
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xfrm_address_t *saddr;
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xfrm_address_t *daddr;
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bool is_packet_offload;
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if (!x->type_offload) {
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NL_SET_ERR_MSG(extack, "Type doesn't support offload");
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return -EINVAL;
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}
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if (xuo->flags &
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~(XFRM_OFFLOAD_IPV6 | XFRM_OFFLOAD_INBOUND | XFRM_OFFLOAD_PACKET)) {
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NL_SET_ERR_MSG(extack, "Unrecognized flags in offload request");
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return -EINVAL;
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}
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is_packet_offload = xuo->flags & XFRM_OFFLOAD_PACKET;
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/* We don't yet support UDP encapsulation and TFC padding. */
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if ((!is_packet_offload && x->encap) || x->tfcpad) {
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NL_SET_ERR_MSG(extack, "Encapsulation and TFC padding can't be offloaded");
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return -EINVAL;
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}
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dev = dev_get_by_index(net, xuo->ifindex);
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if (!dev) {
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if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) {
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saddr = &x->props.saddr;
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daddr = &x->id.daddr;
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} else {
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saddr = &x->id.daddr;
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daddr = &x->props.saddr;
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}
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dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr,
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x->props.family,
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xfrm_smark_get(0, x));
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if (IS_ERR(dst))
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return (is_packet_offload) ? -EINVAL : 0;
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dev = dst->dev;
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dev_hold(dev);
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dst_release(dst);
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}
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if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) {
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xso->dev = NULL;
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dev_put(dev);
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return (is_packet_offload) ? -EINVAL : 0;
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}
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if (!is_packet_offload && x->props.flags & XFRM_STATE_ESN &&
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!dev->xfrmdev_ops->xdo_dev_state_advance_esn) {
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NL_SET_ERR_MSG(extack, "Device doesn't support offload with ESN");
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xso->dev = NULL;
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dev_put(dev);
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return -EINVAL;
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}
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xso->dev = dev;
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netdev_tracker_alloc(dev, &xso->dev_tracker, GFP_ATOMIC);
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xso->real_dev = dev;
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if (xuo->flags & XFRM_OFFLOAD_INBOUND)
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xso->dir = XFRM_DEV_OFFLOAD_IN;
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else
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xso->dir = XFRM_DEV_OFFLOAD_OUT;
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if (is_packet_offload)
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xso->type = XFRM_DEV_OFFLOAD_PACKET;
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else
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xso->type = XFRM_DEV_OFFLOAD_CRYPTO;
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err = dev->xfrmdev_ops->xdo_dev_state_add(x, extack);
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if (err) {
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xso->dev = NULL;
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xso->dir = 0;
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xso->real_dev = NULL;
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netdev_put(dev, &xso->dev_tracker);
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xso->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
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/* User explicitly requested packet offload mode and configured
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* policy in addition to the XFRM state. So be civil to users,
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* and return an error instead of taking fallback path.
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*
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* This WARN_ON() can be seen as a documentation for driver
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* authors to do not return -EOPNOTSUPP in packet offload mode.
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*/
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WARN_ON(err == -EOPNOTSUPP && is_packet_offload);
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if (err != -EOPNOTSUPP || is_packet_offload) {
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NL_SET_ERR_MSG_WEAK(extack, "Device failed to offload this state");
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return err;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(xfrm_dev_state_add);
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int xfrm_dev_policy_add(struct net *net, struct xfrm_policy *xp,
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struct xfrm_user_offload *xuo, u8 dir,
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struct netlink_ext_ack *extack)
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{
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struct xfrm_dev_offload *xdo = &xp->xdo;
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struct net_device *dev;
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int err;
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if (!xuo->flags || xuo->flags & ~XFRM_OFFLOAD_PACKET) {
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/* We support only packet offload mode and it means
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* that user must set XFRM_OFFLOAD_PACKET bit.
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*/
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NL_SET_ERR_MSG(extack, "Unrecognized flags in offload request");
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return -EINVAL;
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}
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dev = dev_get_by_index(net, xuo->ifindex);
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if (!dev)
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return -EINVAL;
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if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_policy_add) {
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xdo->dev = NULL;
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dev_put(dev);
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NL_SET_ERR_MSG(extack, "Policy offload is not supported");
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return -EINVAL;
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}
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xdo->dev = dev;
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netdev_tracker_alloc(dev, &xdo->dev_tracker, GFP_ATOMIC);
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xdo->real_dev = dev;
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xdo->type = XFRM_DEV_OFFLOAD_PACKET;
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switch (dir) {
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case XFRM_POLICY_IN:
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xdo->dir = XFRM_DEV_OFFLOAD_IN;
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break;
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case XFRM_POLICY_OUT:
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xdo->dir = XFRM_DEV_OFFLOAD_OUT;
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break;
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case XFRM_POLICY_FWD:
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xdo->dir = XFRM_DEV_OFFLOAD_FWD;
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break;
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default:
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xdo->dev = NULL;
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netdev_put(dev, &xdo->dev_tracker);
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NL_SET_ERR_MSG(extack, "Unrecognized offload direction");
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return -EINVAL;
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}
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err = dev->xfrmdev_ops->xdo_dev_policy_add(xp, extack);
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if (err) {
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xdo->dev = NULL;
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xdo->real_dev = NULL;
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xdo->type = XFRM_DEV_OFFLOAD_UNSPECIFIED;
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xdo->dir = 0;
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netdev_put(dev, &xdo->dev_tracker);
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NL_SET_ERR_MSG_WEAK(extack, "Device failed to offload this policy");
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return err;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(xfrm_dev_policy_add);
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bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x)
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{
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int mtu;
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struct dst_entry *dst = skb_dst(skb);
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struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
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struct net_device *dev = x->xso.dev;
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if (!x->type_offload || x->encap)
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return false;
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if (x->xso.type == XFRM_DEV_OFFLOAD_PACKET ||
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((!dev || (dev == xfrm_dst_path(dst)->dev)) &&
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!xdst->child->xfrm)) {
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mtu = xfrm_state_mtu(x, xdst->child_mtu_cached);
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if (skb->len <= mtu)
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goto ok;
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if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu))
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goto ok;
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}
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return false;
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ok:
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if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok)
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return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x);
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return true;
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}
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EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok);
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void xfrm_dev_resume(struct sk_buff *skb)
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{
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struct net_device *dev = skb->dev;
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int ret = NETDEV_TX_BUSY;
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struct netdev_queue *txq;
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struct softnet_data *sd;
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unsigned long flags;
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rcu_read_lock();
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txq = netdev_core_pick_tx(dev, skb, NULL);
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HARD_TX_LOCK(dev, txq, smp_processor_id());
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if (!netif_xmit_frozen_or_stopped(txq))
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skb = dev_hard_start_xmit(skb, dev, txq, &ret);
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HARD_TX_UNLOCK(dev, txq);
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if (!dev_xmit_complete(ret)) {
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local_irq_save(flags);
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sd = this_cpu_ptr(&softnet_data);
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skb_queue_tail(&sd->xfrm_backlog, skb);
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raise_softirq_irqoff(NET_TX_SOFTIRQ);
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local_irq_restore(flags);
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(xfrm_dev_resume);
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void xfrm_dev_backlog(struct softnet_data *sd)
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{
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struct sk_buff_head *xfrm_backlog = &sd->xfrm_backlog;
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struct sk_buff_head list;
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struct sk_buff *skb;
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if (skb_queue_empty(xfrm_backlog))
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return;
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__skb_queue_head_init(&list);
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spin_lock(&xfrm_backlog->lock);
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skb_queue_splice_init(xfrm_backlog, &list);
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spin_unlock(&xfrm_backlog->lock);
|
|
|
|
while (!skb_queue_empty(&list)) {
|
|
skb = __skb_dequeue(&list);
|
|
xfrm_dev_resume(skb);
|
|
}
|
|
|
|
}
|
|
#endif
|
|
|
|
static int xfrm_api_check(struct net_device *dev)
|
|
{
|
|
#ifdef CONFIG_XFRM_OFFLOAD
|
|
if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) &&
|
|
!(dev->features & NETIF_F_HW_ESP))
|
|
return NOTIFY_BAD;
|
|
|
|
if ((dev->features & NETIF_F_HW_ESP) &&
|
|
(!(dev->xfrmdev_ops &&
|
|
dev->xfrmdev_ops->xdo_dev_state_add &&
|
|
dev->xfrmdev_ops->xdo_dev_state_delete)))
|
|
return NOTIFY_BAD;
|
|
#else
|
|
if (dev->features & (NETIF_F_HW_ESP | NETIF_F_HW_ESP_TX_CSUM))
|
|
return NOTIFY_BAD;
|
|
#endif
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int xfrm_dev_down(struct net_device *dev)
|
|
{
|
|
if (dev->features & NETIF_F_HW_ESP) {
|
|
xfrm_dev_state_flush(dev_net(dev), dev, true);
|
|
xfrm_dev_policy_flush(dev_net(dev), dev, true);
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int xfrm_dev_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
switch (event) {
|
|
case NETDEV_REGISTER:
|
|
return xfrm_api_check(dev);
|
|
|
|
case NETDEV_FEAT_CHANGE:
|
|
return xfrm_api_check(dev);
|
|
|
|
case NETDEV_DOWN:
|
|
case NETDEV_UNREGISTER:
|
|
return xfrm_dev_down(dev);
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block xfrm_dev_notifier = {
|
|
.notifier_call = xfrm_dev_event,
|
|
};
|
|
|
|
void __init xfrm_dev_init(void)
|
|
{
|
|
register_netdevice_notifier(&xfrm_dev_notifier);
|
|
}
|