From d77e38e612a017480157fe6d2c1422f42cb5b7e3 Mon Sep 17 00:00:00 2001 From: Steffen Klassert Date: Fri, 14 Apr 2017 10:06:10 +0200 Subject: [PATCH] xfrm: Add an IPsec hardware offloading API This patch adds all the bits that are needed to do IPsec hardware offload for IPsec states and ESP packets. We add xfrmdev_ops to the net_device. xfrmdev_ops has function pointers that are needed to manage the xfrm states in the hardware and to do a per packet offloading decision. Joint work with: Ilan Tayari Guy Shapiro Yossi Kuperman Signed-off-by: Guy Shapiro Signed-off-by: Ilan Tayari Signed-off-by: Yossi Kuperman Signed-off-by: Steffen Klassert --- include/linux/netdevice.h | 14 ++++ include/net/xfrm.h | 65 +++++++++++++++++- include/uapi/linux/xfrm.h | 8 +++ net/ipv4/esp4.c | 7 +- net/ipv4/xfrm4_output.c | 3 +- net/ipv6/esp6.c | 4 +- net/ipv6/xfrm6_output.c | 9 ++- net/xfrm/Makefile | 3 +- net/xfrm/xfrm_device.c | 138 +++++++++++++++++++++++++++++++++++++- net/xfrm/xfrm_input.c | 41 ++++++++++- net/xfrm/xfrm_output.c | 44 ++++++++++-- net/xfrm/xfrm_policy.c | 10 +-- net/xfrm/xfrm_state.c | 74 ++++++++++++++++++++ net/xfrm/xfrm_user.c | 28 ++++++++ 14 files changed, 424 insertions(+), 24 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 5bb03d181848..b3eb83db0223 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -824,6 +824,16 @@ struct netdev_xdp { }; }; +#ifdef CONFIG_XFRM_OFFLOAD +struct xfrmdev_ops { + int (*xdo_dev_state_add) (struct xfrm_state *x); + void (*xdo_dev_state_delete) (struct xfrm_state *x); + void (*xdo_dev_state_free) (struct xfrm_state *x); + bool (*xdo_dev_offload_ok) (struct sk_buff *skb, + struct xfrm_state *x); +}; +#endif + /* * This structure defines the management hooks for network devices. * The following hooks can be defined; unless noted otherwise, they are @@ -1697,6 +1707,10 @@ struct net_device { const struct ndisc_ops *ndisc_ops; #endif +#ifdef CONFIG_XFRM + const struct xfrmdev_ops *xfrmdev_ops; +#endif + const struct header_ops *header_ops; unsigned int flags; diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 54515d989365..17603bf190c1 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -120,6 +120,13 @@ struct xfrm_state_walk { struct xfrm_address_filter *filter; }; +struct xfrm_state_offload { + struct net_device *dev; + unsigned long offload_handle; + unsigned int num_exthdrs; + u8 flags; +}; + /* Full description of state of transformer. */ struct xfrm_state { possible_net_t xs_net; @@ -207,6 +214,8 @@ struct xfrm_state { struct xfrm_lifetime_cur curlft; struct tasklet_hrtimer mtimer; + struct xfrm_state_offload xso; + /* used to fix curlft->add_time when changing date */ long saved_tmo; @@ -1453,7 +1462,6 @@ struct xfrm6_tunnel { void xfrm_init(void); void xfrm4_init(void); int xfrm_state_init(struct net *net); -void xfrm_dev_init(void); void xfrm_state_fini(struct net *net); void xfrm4_state_init(void); void xfrm4_protocol_init(void); @@ -1559,6 +1567,7 @@ struct xfrmk_spdinfo { struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq); int xfrm_state_delete(struct xfrm_state *x); int xfrm_state_flush(struct net *net, u8 proto, bool task_valid); +int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid); void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si); void xfrm_spd_getinfo(struct net *net, struct xfrmk_spdinfo *si); u32 xfrm_replay_seqhi(struct xfrm_state *x, __be32 net_seq); @@ -1641,6 +1650,11 @@ static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb) } #endif +struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr, + int family); + struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp); void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type); @@ -1846,6 +1860,55 @@ static inline struct xfrm_offload *xfrm_offload(struct sk_buff *skb) } #endif +#ifdef CONFIG_XFRM_OFFLOAD +void __net_init xfrm_dev_init(void); +int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, + struct xfrm_user_offload *xuo); +bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x); + +static inline void xfrm_dev_state_delete(struct xfrm_state *x) +{ + struct xfrm_state_offload *xso = &x->xso; + + if (xso->dev) + xso->dev->xfrmdev_ops->xdo_dev_state_delete(x); +} + +static inline void xfrm_dev_state_free(struct xfrm_state *x) +{ + struct xfrm_state_offload *xso = &x->xso; + struct net_device *dev = xso->dev; + + if (dev && dev->xfrmdev_ops) { + dev->xfrmdev_ops->xdo_dev_state_free(x); + xso->dev = NULL; + dev_put(dev); + } +} +#else +static inline void __net_init xfrm_dev_init(void) +{ +} + +static inline int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, struct xfrm_user_offload *xuo) +{ + return 0; +} + +static inline void xfrm_dev_state_delete(struct xfrm_state *x) +{ +} + +static inline void xfrm_dev_state_free(struct xfrm_state *x) +{ +} + +static inline bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) +{ + return false; +} +#endif + static inline int xfrm_mark_get(struct nlattr **attrs, struct xfrm_mark *m) { if (attrs[XFRMA_MARK]) diff --git a/include/uapi/linux/xfrm.h b/include/uapi/linux/xfrm.h index 1fc62b239f1b..2b384ff09fa0 100644 --- a/include/uapi/linux/xfrm.h +++ b/include/uapi/linux/xfrm.h @@ -303,6 +303,7 @@ enum xfrm_attr_type_t { XFRMA_PROTO, /* __u8 */ XFRMA_ADDRESS_FILTER, /* struct xfrm_address_filter */ XFRMA_PAD, + XFRMA_OFFLOAD_DEV, /* struct xfrm_state_offload */ __XFRMA_MAX #define XFRMA_MAX (__XFRMA_MAX - 1) @@ -494,6 +495,13 @@ struct xfrm_address_filter { __u8 dplen; }; +struct xfrm_user_offload { + int ifindex; + __u8 flags; +}; +#define XFRM_OFFLOAD_IPV6 1 +#define XFRM_OFFLOAD_INBOUND 2 + #ifndef __KERNEL__ /* backwards compatibility for userspace */ #define XFRMGRP_ACQUIRE 1 diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index b1e24446e297..c6aba234b6e9 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -435,9 +435,6 @@ skip_cow2: aead_request_set_crypt(req, sg, dsg, ivlen + clen, iv); aead_request_set_ad(req, assoclen); - seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low + - ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32)); - memset(iv, 0, ivlen); memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&seqno + 8 - min(ivlen, 8), min(ivlen, 8)); @@ -470,6 +467,7 @@ static int esp_input_done2(struct sk_buff *skb, int err) { const struct iphdr *iph; struct xfrm_state *x = xfrm_input_state(skb); + struct xfrm_offload *xo = xfrm_offload(skb); struct crypto_aead *aead = x->data; int alen = crypto_aead_authsize(aead); int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); @@ -478,7 +476,8 @@ static int esp_input_done2(struct sk_buff *skb, int err) u8 nexthdr[2]; int padlen; - kfree(ESP_SKB_CB(skb)->tmp); + if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) + kfree(ESP_SKB_CB(skb)->tmp); if (unlikely(err)) goto out; diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c index 7ee6518afa86..94b8702603bc 100644 --- a/net/ipv4/xfrm4_output.c +++ b/net/ipv4/xfrm4_output.c @@ -29,7 +29,8 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb) goto out; mtu = dst_mtu(skb_dst(skb)); - if (skb->len > mtu) { + if ((!skb_is_gso(skb) && skb->len > mtu) || + (skb_is_gso(skb) && skb_gso_network_seglen(skb) > ip_skb_dst_mtu(skb->sk, skb))) { skb->protocol = htons(ETH_P_IP); if (skb->sk) diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index ff54faa75631..3d3757d20d0a 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -450,6 +450,7 @@ error: static int esp_input_done2(struct sk_buff *skb, int err) { struct xfrm_state *x = xfrm_input_state(skb); + struct xfrm_offload *xo = xfrm_offload(skb); struct crypto_aead *aead = x->data; int alen = crypto_aead_authsize(aead); int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead); @@ -458,7 +459,8 @@ static int esp_input_done2(struct sk_buff *skb, int err) int padlen; u8 nexthdr[2]; - kfree(ESP_SKB_CB(skb)->tmp); + if (!xo || (xo && !(xo->flags & CRYPTO_DONE))) + kfree(ESP_SKB_CB(skb)->tmp); if (unlikely(err)) goto out; diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c index 4d09ce6fa90e..8ae87d4ec5ff 100644 --- a/net/ipv6/xfrm6_output.c +++ b/net/ipv6/xfrm6_output.c @@ -73,11 +73,16 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb) int mtu, ret = 0; struct dst_entry *dst = skb_dst(skb); + if (skb->ignore_df) + goto out; + mtu = dst_mtu(dst); if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; - if (!skb->ignore_df && skb->len > mtu) { + if ((!skb_is_gso(skb) && skb->len > mtu) || + (skb_is_gso(skb) && + skb_gso_network_seglen(skb) > ip6_skb_dst_mtu(skb))) { skb->dev = dst->dev; skb->protocol = htons(ETH_P_IPV6); @@ -89,7 +94,7 @@ static int xfrm6_tunnel_check_size(struct sk_buff *skb) icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); ret = -EMSGSIZE; } - +out: return ret; } diff --git a/net/xfrm/Makefile b/net/xfrm/Makefile index 55b2ac300995..abf81b329dc1 100644 --- a/net/xfrm/Makefile +++ b/net/xfrm/Makefile @@ -4,7 +4,8 @@ obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \ xfrm_input.o xfrm_output.o \ - xfrm_sysctl.o xfrm_replay.o xfrm_device.o + xfrm_sysctl.o xfrm_replay.o +obj-$(CONFIG_XFRM_OFFLOAD) += xfrm_device.o obj-$(CONFIG_XFRM_STATISTICS) += xfrm_proc.o obj-$(CONFIG_XFRM_ALGO) += xfrm_algo.o obj-$(CONFIG_XFRM_USER) += xfrm_user.o diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c index 34a260a61be9..9bac2ba9052c 100644 --- a/net/xfrm/xfrm_device.c +++ b/net/xfrm/xfrm_device.c @@ -22,13 +22,149 @@ #include #include +int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, + struct xfrm_user_offload *xuo) +{ + int err; + struct dst_entry *dst; + struct net_device *dev; + struct xfrm_state_offload *xso = &x->xso; + xfrm_address_t *saddr; + xfrm_address_t *daddr; + + if (!x->type_offload) + return 0; + + /* We don't yet support UDP encapsulation, TFC padding and ESN. */ + if (x->encap || x->tfcpad || (x->props.flags & XFRM_STATE_ESN)) + return 0; + + dev = dev_get_by_index(net, xuo->ifindex); + if (!dev) { + if (!(xuo->flags & XFRM_OFFLOAD_INBOUND)) { + saddr = &x->props.saddr; + daddr = &x->id.daddr; + } else { + saddr = &x->id.daddr; + daddr = &x->props.saddr; + } + + dst = __xfrm_dst_lookup(net, 0, 0, saddr, daddr, x->props.family); + if (IS_ERR(dst)) + return 0; + + dev = dst->dev; + + dev_hold(dev); + dst_release(dst); + } + + if (!dev->xfrmdev_ops || !dev->xfrmdev_ops->xdo_dev_state_add) { + dev_put(dev); + return 0; + } + + xso->dev = dev; + xso->num_exthdrs = 1; + xso->flags = xuo->flags; + + err = dev->xfrmdev_ops->xdo_dev_state_add(x); + if (err) { + dev_put(dev); + return err; + } + + return 0; +} +EXPORT_SYMBOL_GPL(xfrm_dev_state_add); + +bool xfrm_dev_offload_ok(struct sk_buff *skb, struct xfrm_state *x) +{ + int mtu; + struct dst_entry *dst = skb_dst(skb); + struct xfrm_dst *xdst = (struct xfrm_dst *)dst; + struct net_device *dev = x->xso.dev; + + if (!x->type_offload || x->encap) + return false; + + if ((x->xso.offload_handle && (dev == dst->path->dev)) && + !dst->child->xfrm && x->type->get_mtu) { + mtu = x->type->get_mtu(x, xdst->child_mtu_cached); + + if (skb->len <= mtu) + goto ok; + + if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu)) + goto ok; + } + + return false; + +ok: + if (dev && dev->xfrmdev_ops && dev->xfrmdev_ops->xdo_dev_offload_ok) + return x->xso.dev->xfrmdev_ops->xdo_dev_offload_ok(skb, x); + + return true; +} +EXPORT_SYMBOL_GPL(xfrm_dev_offload_ok); + +int xfrm_dev_register(struct net_device *dev) +{ + if ((dev->features & NETIF_F_HW_ESP) && !dev->xfrmdev_ops) + return NOTIFY_BAD; + if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && + !(dev->features & NETIF_F_HW_ESP)) + return NOTIFY_BAD; + + return NOTIFY_DONE; +} + +static int xfrm_dev_unregister(struct net_device *dev) +{ + return NOTIFY_DONE; +} + +static int xfrm_dev_feat_change(struct net_device *dev) +{ + if ((dev->features & NETIF_F_HW_ESP) && !dev->xfrmdev_ops) + return NOTIFY_BAD; + else if (!(dev->features & NETIF_F_HW_ESP)) + dev->xfrmdev_ops = NULL; + + if ((dev->features & NETIF_F_HW_ESP_TX_CSUM) && + !(dev->features & NETIF_F_HW_ESP)) + return NOTIFY_BAD; + + return NOTIFY_DONE; +} + +static int xfrm_dev_down(struct net_device *dev) +{ + if (dev->hw_features & NETIF_F_HW_ESP) + xfrm_dev_state_flush(dev_net(dev), dev, true); + + xfrm_garbage_collect(dev_net(dev)); + + 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_dev_register(dev); + + case NETDEV_UNREGISTER: + return xfrm_dev_unregister(dev); + + case NETDEV_FEAT_CHANGE: + return xfrm_dev_feat_change(dev); + case NETDEV_DOWN: - xfrm_garbage_collect(dev_net(dev)); + return xfrm_dev_down(dev); } return NOTIFY_DONE; } diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index 46bdb4fbed0b..362d655eac27 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -107,6 +107,8 @@ struct sec_path *secpath_dup(struct sec_path *src) sp->len = 0; sp->olen = 0; + memset(sp->ovec, 0, sizeof(sp->ovec[XFRM_MAX_OFFLOAD_DEPTH])); + if (src) { int i; @@ -207,8 +209,9 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) unsigned int family; int decaps = 0; int async = 0; - struct xfrm_offload *xo; bool xfrm_gro = false; + bool crypto_done = false; + struct xfrm_offload *xo = xfrm_offload(skb); if (encap_type < 0) { x = xfrm_input_state(skb); @@ -226,6 +229,37 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) goto lock; } + if (xo && (xo->flags & CRYPTO_DONE)) { + crypto_done = true; + x = xfrm_input_state(skb); + family = XFRM_SPI_SKB_CB(skb)->family; + + if (!(xo->status & CRYPTO_SUCCESS)) { + if (xo->status & + (CRYPTO_TRANSPORT_AH_AUTH_FAILED | + CRYPTO_TRANSPORT_ESP_AUTH_FAILED | + CRYPTO_TUNNEL_AH_AUTH_FAILED | + CRYPTO_TUNNEL_ESP_AUTH_FAILED)) { + + xfrm_audit_state_icvfail(x, skb, + x->type->proto); + x->stats.integrity_failed++; + XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); + goto drop; + } + + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto drop; + } + + if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); + goto drop; + } + + goto lock; + } + daddr = (xfrm_address_t *)(skb_network_header(skb) + XFRM_SPI_SKB_CB(skb)->daddroff); family = XFRM_SPI_SKB_CB(skb)->family; @@ -311,7 +345,10 @@ lock: skb_dst_force(skb); dev_hold(skb->dev); - nexthdr = x->type->input(x, skb); + if (crypto_done) + nexthdr = x->type_offload->input_tail(x, skb); + else + nexthdr = x->type->input(x, skb); if (nexthdr == -EINPROGRESS) return 0; diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c index 8ba29fe58352..a15088613a6c 100644 --- a/net/xfrm/xfrm_output.c +++ b/net/xfrm/xfrm_output.c @@ -99,12 +99,13 @@ static int xfrm_output_one(struct sk_buff *skb, int err) skb_dst_force(skb); - /* Inner headers are invalid now. */ - skb->encapsulation = 0; - - err = x->type->output(x, skb); - if (err == -EINPROGRESS) - goto out; + if (xfrm_offload(skb)) { + x->type_offload->encap(x, skb); + } else { + err = x->type->output(x, skb); + if (err == -EINPROGRESS) + goto out; + } resume: if (err) { @@ -200,8 +201,38 @@ static int xfrm_output_gso(struct net *net, struct sock *sk, struct sk_buff *skb int xfrm_output(struct sock *sk, struct sk_buff *skb) { struct net *net = dev_net(skb_dst(skb)->dev); + struct xfrm_state *x = skb_dst(skb)->xfrm; int err; + secpath_reset(skb); + + if (xfrm_dev_offload_ok(skb, x)) { + struct sec_path *sp; + + sp = secpath_dup(skb->sp); + if (!sp) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); + kfree_skb(skb); + return -ENOMEM; + } + if (skb->sp) + secpath_put(skb->sp); + skb->sp = sp; + + sp->olen++; + sp->xvec[skb->sp->len++] = x; + xfrm_state_hold(x); + + if (skb_is_gso(skb)) { + skb_shinfo(skb)->gso_type |= SKB_GSO_ESP; + + return xfrm_output2(net, sk, skb); + } + + if (x->xso.dev && x->xso.dev->features & NETIF_F_HW_ESP_TX_CSUM) + goto out; + } + if (skb_is_gso(skb)) return xfrm_output_gso(net, sk, skb); @@ -214,6 +245,7 @@ int xfrm_output(struct sock *sk, struct sk_buff *skb) } } +out: return xfrm_output2(net, sk, skb); } EXPORT_SYMBOL_GPL(xfrm_output); diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 7befca2a0773..dd44ddc1aea5 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -116,11 +116,10 @@ static const struct xfrm_policy_afinfo *xfrm_policy_get_afinfo(unsigned short fa return afinfo; } -static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, - int tos, int oif, - const xfrm_address_t *saddr, - const xfrm_address_t *daddr, - int family) +struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos, int oif, + const xfrm_address_t *saddr, + const xfrm_address_t *daddr, + int family) { const struct xfrm_policy_afinfo *afinfo; struct dst_entry *dst; @@ -135,6 +134,7 @@ static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, return dst; } +EXPORT_SYMBOL(__xfrm_dst_lookup); static inline struct dst_entry *xfrm_dst_lookup(struct xfrm_state *x, int tos, int oif, diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 47fefe97d1e3..fc3c5aa38754 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -440,6 +440,7 @@ static void xfrm_state_gc_destroy(struct xfrm_state *x) x->type->destructor(x); xfrm_put_type(x->type); } + xfrm_dev_state_free(x); security_xfrm_state_free(x); kfree(x); } @@ -609,6 +610,8 @@ int __xfrm_state_delete(struct xfrm_state *x) net->xfrm.state_num--; spin_unlock(&net->xfrm.xfrm_state_lock); + xfrm_dev_state_delete(x); + /* All xfrm_state objects are created by xfrm_state_alloc. * The xfrm_state_alloc call gives a reference, and that * is what we are dropping here. @@ -653,12 +656,41 @@ xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) return err; } + +static inline int +xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) +{ + int i, err = 0; + + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + struct xfrm_state_offload *xso; + + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + xso = &x->xso; + + if (xso->dev == dev && + (err = security_xfrm_state_delete(x)) != 0) { + xfrm_audit_state_delete(x, 0, task_valid); + return err; + } + } + } + + return err; +} #else static inline int xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid) { return 0; } + +static inline int +xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid) +{ + return 0; +} #endif int xfrm_state_flush(struct net *net, u8 proto, bool task_valid) @@ -701,6 +733,48 @@ out: } EXPORT_SYMBOL(xfrm_state_flush); +int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid) +{ + int i, err = 0, cnt = 0; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid); + if (err) + goto out; + + err = -ESRCH; + for (i = 0; i <= net->xfrm.state_hmask; i++) { + struct xfrm_state *x; + struct xfrm_state_offload *xso; +restart: + hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) { + xso = &x->xso; + + if (!xfrm_state_kern(x) && xso->dev == dev) { + xfrm_state_hold(x); + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + + err = xfrm_state_delete(x); + xfrm_audit_state_delete(x, err ? 0 : 1, + task_valid); + xfrm_state_put(x); + if (!err) + cnt++; + + spin_lock_bh(&net->xfrm.xfrm_state_lock); + goto restart; + } + } + } + if (cnt) + err = 0; + +out: + spin_unlock_bh(&net->xfrm.xfrm_state_lock); + return err; +} +EXPORT_SYMBOL(xfrm_dev_state_flush); + void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si) { spin_lock_bh(&net->xfrm.xfrm_state_lock); diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 4f7e62ddc17e..de3332e3f9e2 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -595,6 +595,10 @@ static struct xfrm_state *xfrm_state_construct(struct net *net, goto error; } + if (attrs[XFRMA_OFFLOAD_DEV] && + xfrm_dev_state_add(net, x, nla_data(attrs[XFRMA_OFFLOAD_DEV]))) + goto error; + if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn, attrs[XFRMA_REPLAY_ESN_VAL]))) goto error; @@ -779,6 +783,23 @@ static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb) return 0; } +static int copy_user_offload(struct xfrm_state_offload *xso, struct sk_buff *skb) +{ + struct xfrm_user_offload *xuo; + struct nlattr *attr; + + attr = nla_reserve(skb, XFRMA_OFFLOAD_DEV, sizeof(*xuo)); + if (attr == NULL) + return -EMSGSIZE; + + xuo = nla_data(attr); + + xuo->ifindex = xso->dev->ifindex; + xuo->flags = xso->flags; + + return 0; +} + static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb) { struct xfrm_algo *algo; @@ -869,6 +890,10 @@ static int copy_to_user_state_extra(struct xfrm_state *x, &x->replay); if (ret) goto out; + if(x->xso.dev) + ret = copy_user_offload(&x->xso, skb); + if (ret) + goto out; if (x->security) ret = copy_sec_ctx(x->security, skb); out: @@ -2406,6 +2431,7 @@ static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 }, [XFRMA_PROTO] = { .type = NLA_U8 }, [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) }, + [XFRMA_OFFLOAD_DEV] = { .len = sizeof(struct xfrm_user_offload) }, }; static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = { @@ -2622,6 +2648,8 @@ static inline size_t xfrm_sa_len(struct xfrm_state *x) l += nla_total_size(sizeof(*x->coaddr)); if (x->props.extra_flags) l += nla_total_size(sizeof(x->props.extra_flags)); + if (x->xso.dev) + l += nla_total_size(sizeof(x->xso)); /* Must count x->lastused as it may become non-zero behind our back. */ l += nla_total_size_64bit(sizeof(u64)); -- 2.20.1