diff options
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/Makefile | 3 | ||||
| -rw-r--r-- | net/xfrm/xfrm_compat.c | 6 | ||||
| -rw-r--r-- | net/xfrm/xfrm_device.c | 6 | ||||
| -rw-r--r-- | net/xfrm/xfrm_input.c | 3 | ||||
| -rw-r--r-- | net/xfrm/xfrm_nat_keepalive.c | 292 | ||||
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 13 | ||||
| -rw-r--r-- | net/xfrm/xfrm_state.c | 17 | ||||
| -rw-r--r-- | net/xfrm/xfrm_user.c | 15 |
8 files changed, 347 insertions, 8 deletions
diff --git a/net/xfrm/Makefile b/net/xfrm/Makefile index 547cec77ba03..512e0b2f8514 100644 --- a/net/xfrm/Makefile +++ b/net/xfrm/Makefile @@ -13,7 +13,8 @@ endif obj-$(CONFIG_XFRM) := xfrm_policy.o xfrm_state.o xfrm_hash.o \ xfrm_input.o xfrm_output.o \ - xfrm_sysctl.o xfrm_replay.o xfrm_device.o + xfrm_sysctl.o xfrm_replay.o xfrm_device.o \ + xfrm_nat_keepalive.o obj-$(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_compat.c b/net/xfrm/xfrm_compat.c index 703d4172c7d7..91357ccaf4af 100644 --- a/net/xfrm/xfrm_compat.c +++ b/net/xfrm/xfrm_compat.c @@ -131,6 +131,7 @@ static const struct nla_policy compat_policy[XFRMA_MAX+1] = { [XFRMA_IF_ID] = { .type = NLA_U32 }, [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 }, [XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT), + [XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 }, }; static struct nlmsghdr *xfrm_nlmsg_put_compat(struct sk_buff *skb, @@ -280,9 +281,10 @@ static int xfrm_xlate64_attr(struct sk_buff *dst, const struct nlattr *src) case XFRMA_IF_ID: case XFRMA_MTIMER_THRESH: case XFRMA_SA_DIR: + case XFRMA_NAT_KEEPALIVE_INTERVAL: return xfrm_nla_cpy(dst, src, nla_len(src)); default: - BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_DIR); + BUILD_BUG_ON(XFRMA_MAX != XFRMA_NAT_KEEPALIVE_INTERVAL); pr_warn_once("unsupported nla_type %d\n", src->nla_type); return -EOPNOTSUPP; } @@ -437,7 +439,7 @@ static int xfrm_xlate32_attr(void *dst, const struct nlattr *nla, int err; if (type > XFRMA_MAX) { - BUILD_BUG_ON(XFRMA_MAX != XFRMA_SA_DIR); + BUILD_BUG_ON(XFRMA_MAX != XFRMA_NAT_KEEPALIVE_INTERVAL); NL_SET_ERR_MSG(extack, "Bad attribute"); return -EOPNOTSUPP; } diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c index 2455a76a1cff..9a44d363ba62 100644 --- a/net/xfrm/xfrm_device.c +++ b/net/xfrm/xfrm_device.c @@ -261,9 +261,9 @@ int xfrm_dev_state_add(struct net *net, struct xfrm_state *x, is_packet_offload = xuo->flags & XFRM_OFFLOAD_PACKET; - /* We don't yet support UDP encapsulation and TFC padding. */ - if ((!is_packet_offload && x->encap) || x->tfcpad) { - NL_SET_ERR_MSG(extack, "Encapsulation and TFC padding can't be offloaded"); + /* We don't yet support TFC padding. */ + if (x->tfcpad) { + NL_SET_ERR_MSG(extack, "TFC padding can't be offloaded"); return -EINVAL; } diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c index d2ea18dcb0cb..7cee9c0a2cdc 100644 --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -471,7 +471,8 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) struct xfrm_offload *xo = xfrm_offload(skb); struct sec_path *sp; - if (encap_type < 0 || (xo && xo->flags & XFRM_GRO)) { + if (encap_type < 0 || (xo && (xo->flags & XFRM_GRO || encap_type == 0 || + encap_type == UDP_ENCAP_ESPINUDP))) { x = xfrm_input_state(skb); if (unlikely(x->dir && x->dir != XFRM_SA_DIR_IN)) { diff --git a/net/xfrm/xfrm_nat_keepalive.c b/net/xfrm/xfrm_nat_keepalive.c new file mode 100644 index 000000000000..82f0a301683f --- /dev/null +++ b/net/xfrm/xfrm_nat_keepalive.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * xfrm_nat_keepalive.c + * + * (c) 2024 Eyal Birger <eyal.birger@gmail.com> + */ + +#include <net/inet_common.h> +#include <net/ip6_checksum.h> +#include <net/xfrm.h> + +static DEFINE_PER_CPU(struct sock *, nat_keepalive_sk_ipv4); +#if IS_ENABLED(CONFIG_IPV6) +static DEFINE_PER_CPU(struct sock *, nat_keepalive_sk_ipv6); +#endif + +struct nat_keepalive { + struct net *net; + u16 family; + xfrm_address_t saddr; + xfrm_address_t daddr; + __be16 encap_sport; + __be16 encap_dport; + __u32 smark; +}; + +static void nat_keepalive_init(struct nat_keepalive *ka, struct xfrm_state *x) +{ + ka->net = xs_net(x); + ka->family = x->props.family; + ka->saddr = x->props.saddr; + ka->daddr = x->id.daddr; + ka->encap_sport = x->encap->encap_sport; + ka->encap_dport = x->encap->encap_dport; + ka->smark = xfrm_smark_get(0, x); +} + +static int nat_keepalive_send_ipv4(struct sk_buff *skb, + struct nat_keepalive *ka) +{ + struct net *net = ka->net; + struct flowi4 fl4; + struct rtable *rt; + struct sock *sk; + __u8 tos = 0; + int err; + + flowi4_init_output(&fl4, 0 /* oif */, skb->mark, tos, + RT_SCOPE_UNIVERSE, IPPROTO_UDP, 0, + ka->daddr.a4, ka->saddr.a4, ka->encap_dport, + ka->encap_sport, sock_net_uid(net, NULL)); + + rt = ip_route_output_key(net, &fl4); + if (IS_ERR(rt)) + return PTR_ERR(rt); + + skb_dst_set(skb, &rt->dst); + + sk = *this_cpu_ptr(&nat_keepalive_sk_ipv4); + sock_net_set(sk, net); + err = ip_build_and_send_pkt(skb, sk, fl4.saddr, fl4.daddr, NULL, tos); + sock_net_set(sk, &init_net); + return err; +} + +#if IS_ENABLED(CONFIG_IPV6) +static int nat_keepalive_send_ipv6(struct sk_buff *skb, + struct nat_keepalive *ka, + struct udphdr *uh) +{ + struct net *net = ka->net; + struct dst_entry *dst; + struct flowi6 fl6; + struct sock *sk; + __wsum csum; + int err; + + csum = skb_checksum(skb, 0, skb->len, 0); + uh->check = csum_ipv6_magic(&ka->saddr.in6, &ka->daddr.in6, + skb->len, IPPROTO_UDP, csum); + if (uh->check == 0) + uh->check = CSUM_MANGLED_0; + + memset(&fl6, 0, sizeof(fl6)); + fl6.flowi6_mark = skb->mark; + fl6.saddr = ka->saddr.in6; + fl6.daddr = ka->daddr.in6; + fl6.flowi6_proto = IPPROTO_UDP; + fl6.fl6_sport = ka->encap_sport; + fl6.fl6_dport = ka->encap_dport; + + sk = *this_cpu_ptr(&nat_keepalive_sk_ipv6); + sock_net_set(sk, net); + dst = ipv6_stub->ipv6_dst_lookup_flow(net, sk, &fl6, NULL); + if (IS_ERR(dst)) + return PTR_ERR(dst); + + skb_dst_set(skb, dst); + err = ipv6_stub->ip6_xmit(sk, skb, &fl6, skb->mark, NULL, 0, 0); + sock_net_set(sk, &init_net); + return err; +} +#endif + +static void nat_keepalive_send(struct nat_keepalive *ka) +{ + const int nat_ka_hdrs_len = max(sizeof(struct iphdr), + sizeof(struct ipv6hdr)) + + sizeof(struct udphdr); + const u8 nat_ka_payload = 0xFF; + int err = -EAFNOSUPPORT; + struct sk_buff *skb; + struct udphdr *uh; + + skb = alloc_skb(nat_ka_hdrs_len + sizeof(nat_ka_payload), GFP_ATOMIC); + if (unlikely(!skb)) + return; + + skb_reserve(skb, nat_ka_hdrs_len); + + skb_put_u8(skb, nat_ka_payload); + + uh = skb_push(skb, sizeof(*uh)); + uh->source = ka->encap_sport; + uh->dest = ka->encap_dport; + uh->len = htons(skb->len); + uh->check = 0; + + skb->mark = ka->smark; + + switch (ka->family) { + case AF_INET: + err = nat_keepalive_send_ipv4(skb, ka); + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + err = nat_keepalive_send_ipv6(skb, ka, uh); + break; +#endif + } + if (err) + kfree_skb(skb); +} + +struct nat_keepalive_work_ctx { + time64_t next_run; + time64_t now; +}; + +static int nat_keepalive_work_single(struct xfrm_state *x, int count, void *ptr) +{ + struct nat_keepalive_work_ctx *ctx = ptr; + bool send_keepalive = false; + struct nat_keepalive ka; + time64_t next_run; + u32 interval; + int delta; + + interval = x->nat_keepalive_interval; + if (!interval) + return 0; + + spin_lock(&x->lock); + + delta = (int)(ctx->now - x->lastused); + if (delta < interval) { + x->nat_keepalive_expiration = ctx->now + interval - delta; + next_run = x->nat_keepalive_expiration; + } else if (x->nat_keepalive_expiration > ctx->now) { + next_run = x->nat_keepalive_expiration; + } else { + next_run = ctx->now + interval; + nat_keepalive_init(&ka, x); + send_keepalive = true; + } + + spin_unlock(&x->lock); + + if (send_keepalive) + nat_keepalive_send(&ka); + + if (!ctx->next_run || next_run < ctx->next_run) + ctx->next_run = next_run; + return 0; +} + +static void nat_keepalive_work(struct work_struct *work) +{ + struct nat_keepalive_work_ctx ctx; + struct xfrm_state_walk walk; + struct net *net; + + ctx.next_run = 0; + ctx.now = ktime_get_real_seconds(); + + net = container_of(work, struct net, xfrm.nat_keepalive_work.work); + xfrm_state_walk_init(&walk, IPPROTO_ESP, NULL); + xfrm_state_walk(net, &walk, nat_keepalive_work_single, &ctx); + xfrm_state_walk_done(&walk, net); + if (ctx.next_run) + schedule_delayed_work(&net->xfrm.nat_keepalive_work, + (ctx.next_run - ctx.now) * HZ); +} + +static int nat_keepalive_sk_init(struct sock * __percpu *socks, + unsigned short family) +{ + struct sock *sk; + int err, i; + + for_each_possible_cpu(i) { + err = inet_ctl_sock_create(&sk, family, SOCK_RAW, IPPROTO_UDP, + &init_net); + if (err < 0) + goto err; + + *per_cpu_ptr(socks, i) = sk; + } + + return 0; +err: + for_each_possible_cpu(i) + inet_ctl_sock_destroy(*per_cpu_ptr(socks, i)); + return err; +} + +static void nat_keepalive_sk_fini(struct sock * __percpu *socks) +{ + int i; + + for_each_possible_cpu(i) + inet_ctl_sock_destroy(*per_cpu_ptr(socks, i)); +} + +void xfrm_nat_keepalive_state_updated(struct xfrm_state *x) +{ + struct net *net; + + if (!x->nat_keepalive_interval) + return; + + net = xs_net(x); + schedule_delayed_work(&net->xfrm.nat_keepalive_work, 0); +} + +int __net_init xfrm_nat_keepalive_net_init(struct net *net) +{ + INIT_DELAYED_WORK(&net->xfrm.nat_keepalive_work, nat_keepalive_work); + return 0; +} + +int xfrm_nat_keepalive_net_fini(struct net *net) +{ + cancel_delayed_work_sync(&net->xfrm.nat_keepalive_work); + return 0; +} + +int xfrm_nat_keepalive_init(unsigned short family) +{ + int err = -EAFNOSUPPORT; + + switch (family) { + case AF_INET: + err = nat_keepalive_sk_init(&nat_keepalive_sk_ipv4, PF_INET); + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + err = nat_keepalive_sk_init(&nat_keepalive_sk_ipv6, PF_INET6); + break; +#endif + } + + if (err) + pr_err("xfrm nat keepalive init: failed to init err:%d\n", err); + return err; +} +EXPORT_SYMBOL_GPL(xfrm_nat_keepalive_init); + +void xfrm_nat_keepalive_fini(unsigned short family) +{ + switch (family) { + case AF_INET: + nat_keepalive_sk_fini(&nat_keepalive_sk_ipv4); + break; +#if IS_ENABLED(CONFIG_IPV6) + case AF_INET6: + nat_keepalive_sk_fini(&nat_keepalive_sk_ipv6); + break; +#endif + } +} +EXPORT_SYMBOL_GPL(xfrm_nat_keepalive_fini); diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 66e07de2de35..b35e11d80c27 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -3718,12 +3718,15 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, pol = xfrm_in_fwd_icmp(skb, &fl, family, if_id); if (!pol) { + const bool is_crypto_offload = sp && + (xfrm_input_state(skb)->xso.type == XFRM_DEV_OFFLOAD_CRYPTO); + if (net->xfrm.policy_default[dir] == XFRM_USERPOLICY_BLOCK) { XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); return 0; } - if (sp && secpath_has_nontransport(sp, 0, &xerr_idx)) { + if (sp && secpath_has_nontransport(sp, 0, &xerr_idx) && !is_crypto_offload) { xfrm_secpath_reject(xerr_idx, skb, &fl); XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOPOLS); return 0; @@ -4284,8 +4287,14 @@ static int __net_init xfrm_net_init(struct net *net) if (rv < 0) goto out_sysctl; + rv = xfrm_nat_keepalive_net_init(net); + if (rv < 0) + goto out_nat_keepalive; + return 0; +out_nat_keepalive: + xfrm_sysctl_fini(net); out_sysctl: xfrm_policy_fini(net); out_policy: @@ -4298,6 +4307,7 @@ out_statistics: static void __net_exit xfrm_net_exit(struct net *net) { + xfrm_nat_keepalive_net_fini(net); xfrm_sysctl_fini(net); xfrm_policy_fini(net); xfrm_state_fini(net); @@ -4359,6 +4369,7 @@ void __init xfrm_init(void) #endif register_xfrm_state_bpf(); + xfrm_nat_keepalive_init(AF_INET); } #ifdef CONFIG_AUDITSYSCALL diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 649bb739df0d..abadc857cd45 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -715,6 +715,7 @@ int __xfrm_state_delete(struct xfrm_state *x) if (x->id.spi) hlist_del_rcu(&x->byspi); net->xfrm.state_num--; + xfrm_nat_keepalive_state_updated(x); spin_unlock(&net->xfrm.xfrm_state_lock); if (x->encap_sk) @@ -1453,6 +1454,7 @@ static void __xfrm_state_insert(struct xfrm_state *x) net->xfrm.state_num++; xfrm_hash_grow_check(net, x->bydst.next != NULL); + xfrm_nat_keepalive_state_updated(x); } /* net->xfrm.xfrm_state_lock is held */ @@ -2871,6 +2873,21 @@ int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload, goto error; } + if (x->nat_keepalive_interval) { + if (x->dir != XFRM_SA_DIR_OUT) { + NL_SET_ERR_MSG(extack, "NAT keepalive is only supported for outbound SAs"); + err = -EINVAL; + goto error; + } + + if (!x->encap || x->encap->encap_type != UDP_ENCAP_ESPINUDP) { + NL_SET_ERR_MSG(extack, + "NAT keepalive is only supported for UDP encapsulation"); + err = -EINVAL; + goto error; + } + } + error: return err; } diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index e83c687bd64e..a552cfa623ea 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -833,6 +833,10 @@ static struct xfrm_state *xfrm_state_construct(struct net *net, if (attrs[XFRMA_SA_DIR]) x->dir = nla_get_u8(attrs[XFRMA_SA_DIR]); + if (attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]) + x->nat_keepalive_interval = + nla_get_u32(attrs[XFRMA_NAT_KEEPALIVE_INTERVAL]); + err = __xfrm_init_state(x, false, attrs[XFRMA_OFFLOAD_DEV], extack); if (err) goto error; @@ -1288,6 +1292,13 @@ static int copy_to_user_state_extra(struct xfrm_state *x, } if (x->dir) ret = nla_put_u8(skb, XFRMA_SA_DIR, x->dir); + + if (x->nat_keepalive_interval) { + ret = nla_put_u32(skb, XFRMA_NAT_KEEPALIVE_INTERVAL, + x->nat_keepalive_interval); + if (ret) + goto out; + } out: return ret; } @@ -3165,6 +3176,7 @@ const struct nla_policy xfrma_policy[XFRMA_MAX+1] = { [XFRMA_IF_ID] = { .type = NLA_U32 }, [XFRMA_MTIMER_THRESH] = { .type = NLA_U32 }, [XFRMA_SA_DIR] = NLA_POLICY_RANGE(NLA_U8, XFRM_SA_DIR_IN, XFRM_SA_DIR_OUT), + [XFRMA_NAT_KEEPALIVE_INTERVAL] = { .type = NLA_U32 }, }; EXPORT_SYMBOL_GPL(xfrma_policy); @@ -3474,6 +3486,9 @@ static inline unsigned int xfrm_sa_len(struct xfrm_state *x) if (x->dir) l += nla_total_size(sizeof(x->dir)); + if (x->nat_keepalive_interval) + l += nla_total_size(sizeof(x->nat_keepalive_interval)); + return l; } |