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Message-ID: <alpine.OSX.2.21.1801021115090.8545@ssempron-mobl.amr.corp.intel.com>
Date: Tue, 2 Jan 2018 11:39:23 -0800 (PST)
From: Mat Martineau <mathew.j.martineau@...ux.intel.com>
To: Christoph Paasch <cpaasch@...le.com>
cc: netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
Alexei Starovoitov <ast@...nel.org>
Subject: Re: [RFC 11/14] tcp_md5: Move TCP-MD5 code out of TCP itself
Hi Christoph -
On Mon, 18 Dec 2017, Christoph Paasch wrote:
> This is all just copy-pasting the TCP_MD5-code into functions that are
> placed in net/ipv4/tcp_md5.c.
>
> Signed-off-by: Christoph Paasch <cpaasch@...le.com>
> Reviewed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> ---
> include/linux/inet_diag.h | 1 +
> include/linux/tcp_md5.h | 138 ++++++
> include/net/tcp.h | 77 ----
> net/ipv4/Makefile | 1 +
> net/ipv4/tcp.c | 133 +-----
> net/ipv4/tcp_diag.c | 81 +---
> net/ipv4/tcp_input.c | 38 --
> net/ipv4/tcp_ipv4.c | 520 ++-------------------
> net/ipv4/tcp_md5.c | 1102 +++++++++++++++++++++++++++++++++++++++++++++
> net/ipv4/tcp_minisocks.c | 27 +-
> net/ipv4/tcp_output.c | 4 +-
> net/ipv6/tcp_ipv6.c | 318 +------------
> 12 files changed, 1305 insertions(+), 1135 deletions(-)
> create mode 100644 include/linux/tcp_md5.h
> create mode 100644 net/ipv4/tcp_md5.c
...
> diff --git a/include/linux/tcp_md5.h b/include/linux/tcp_md5.h
> new file mode 100644
> index 000000000000..f6a681cdded4
> --- /dev/null
> +++ b/include/linux/tcp_md5.h
> @@ -0,0 +1,138 @@
There's no license info in this new file. Take a look at the SPDX
identifiers recently added as the first line of some files (like
tcp_vegas.h) for one way to do it.
> +#ifndef _LINUX_TCP_MD5_H
> +#define _LINUX_TCP_MD5_H
> +
> +#include <linux/skbuff.h>
> +
> +#ifdef CONFIG_TCP_MD5SIG
> +#include <linux/types.h>
> +
> +#include <net/tcp.h>
> +
> +union tcp_md5_addr {
> + struct in_addr a4;
> +#if IS_ENABLED(CONFIG_IPV6)
> + struct in6_addr a6;
> +#endif
> +};
> +
> +/* - key database */
> +struct tcp_md5sig_key {
> + struct hlist_node node;
> + u8 keylen;
> + u8 family; /* AF_INET or AF_INET6 */
> + union tcp_md5_addr addr;
> + u8 prefixlen;
> + u8 key[TCP_MD5SIG_MAXKEYLEN];
> + struct rcu_head rcu;
> +};
> +
> +/* - sock block */
> +struct tcp_md5sig_info {
> + struct hlist_head head;
> + struct rcu_head rcu;
> +};
> +
> +union tcp_md5sum_block {
> + struct tcp4_pseudohdr ip4;
> +#if IS_ENABLED(CONFIG_IPV6)
> + struct tcp6_pseudohdr ip6;
> +#endif
> +};
> +
> +/* - pool: digest algorithm, hash description and scratch buffer */
> +struct tcp_md5sig_pool {
> + struct ahash_request *md5_req;
> + void *scratch;
> +};
> +
> +extern const struct tcp_sock_af_ops tcp_sock_ipv4_specific;
> +extern const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
> +extern const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
> +
> +/* - functions */
> +int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
> + const struct sock *sk, const struct sk_buff *skb);
> +
> +struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk,
> + const struct sock *addr_sk);
> +
> +void tcp_v4_md5_destroy_sock(struct sock *sk);
> +
> +int tcp_v4_md5_send_response_prepare(struct sk_buff *skb, u8 flags,
> + unsigned int remaining,
> + struct tcp_out_options *opts,
> + const struct sock *sk);
> +
> +void tcp_v4_md5_send_response_write(__be32 *topt, struct sk_buff *skb,
> + struct tcphdr *t1,
> + struct tcp_out_options *opts,
> + const struct sock *sk);
> +
> +int tcp_v6_md5_send_response_prepare(struct sk_buff *skb, u8 flags,
> + unsigned int remaining,
> + struct tcp_out_options *opts,
> + const struct sock *sk);
> +
> +void tcp_v6_md5_send_response_write(__be32 *topt, struct sk_buff *skb,
> + struct tcphdr *t1,
> + struct tcp_out_options *opts,
> + const struct sock *sk);
> +
> +bool tcp_v4_inbound_md5_hash(const struct sock *sk,
> + const struct sk_buff *skb);
> +
> +void tcp_v4_md5_syn_recv_sock(const struct sock *listener, struct sock *sk);
> +
> +void tcp_v6_md5_syn_recv_sock(const struct sock *listener, struct sock *sk);
> +
> +void tcp_md5_time_wait(struct sock *sk, struct inet_timewait_sock *tw);
> +
> +struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
> + const struct sock *addr_sk);
> +
> +int tcp_v6_md5_hash_skb(char *md5_hash,
> + const struct tcp_md5sig_key *key,
> + const struct sock *sk,
> + const struct sk_buff *skb);
> +
> +bool tcp_v6_inbound_md5_hash(const struct sock *sk,
> + const struct sk_buff *skb);
> +
> +static inline void tcp_md5_twsk_destructor(struct sock *sk)
> +{
> + struct tcp_timewait_sock *twsk = tcp_twsk(sk);
> +
> + if (twsk->tw_md5_key)
> + kfree_rcu(twsk->tw_md5_key, rcu);
> +}
> +
> +static inline void tcp_md5_add_header_len(const struct sock *listener,
> + struct sock *sk)
> +{
> + struct tcp_sock *tp = tcp_sk(sk);
> +
> + if (tp->af_specific->md5_lookup(listener, sk))
> + tp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED;
> +}
> +
> +int tcp_md5_diag_get_aux(struct sock *sk, bool net_admin, struct sk_buff *skb);
> +
> +int tcp_md5_diag_get_aux_size(struct sock *sk, bool net_admin);
> +
> +#else
> +
> +static inline bool tcp_v4_inbound_md5_hash(const struct sock *sk,
> + const struct sk_buff *skb)
> +{
> + return false;
> +}
> +
> +static inline bool tcp_v6_inbound_md5_hash(const struct sock *sk,
> + const struct sk_buff *skb)
> +{
> + return false;
> +}
> +
> +#endif
> +
> +#endif /* _LINUX_TCP_MD5_H */
...
> diff --git a/net/ipv4/tcp_md5.c b/net/ipv4/tcp_md5.c
> new file mode 100644
> index 000000000000..a31b404e6dbf
> --- /dev/null
> +++ b/net/ipv4/tcp_md5.c
> @@ -0,0 +1,1102 @@
This new file needs license info too, maybe a SPDX identifier like
tcp_input.c
Regards,
Mat
> +#include <linux/inet_diag.h>
> +#include <linux/inetdevice.h>
> +#include <linux/tcp.h>
> +#include <linux/tcp_md5.h>
> +
> +#include <crypto/hash.h>
> +
> +#include <net/inet6_hashtables.h>
> +
> +static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool);
> +static DEFINE_MUTEX(tcp_md5sig_mutex);
> +static bool tcp_md5sig_pool_populated;
> +
> +#define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_key)
> +
> +static void __tcp_alloc_md5sig_pool(void)
> +{
> + struct crypto_ahash *hash;
> + int cpu;
> +
> + hash = crypto_alloc_ahash("md5", 0, CRYPTO_ALG_ASYNC);
> + if (IS_ERR(hash))
> + return;
> +
> + for_each_possible_cpu(cpu) {
> + void *scratch = per_cpu(tcp_md5sig_pool, cpu).scratch;
> + struct ahash_request *req;
> +
> + if (!scratch) {
> + scratch = kmalloc_node(sizeof(union tcp_md5sum_block) +
> + sizeof(struct tcphdr),
> + GFP_KERNEL,
> + cpu_to_node(cpu));
> + if (!scratch)
> + return;
> + per_cpu(tcp_md5sig_pool, cpu).scratch = scratch;
> + }
> + if (per_cpu(tcp_md5sig_pool, cpu).md5_req)
> + continue;
> +
> + req = ahash_request_alloc(hash, GFP_KERNEL);
> + if (!req)
> + return;
> +
> + ahash_request_set_callback(req, 0, NULL, NULL);
> +
> + per_cpu(tcp_md5sig_pool, cpu).md5_req = req;
> + }
> + /* before setting tcp_md5sig_pool_populated, we must commit all writes
> + * to memory. See smp_rmb() in tcp_get_md5sig_pool()
> + */
> + smp_wmb();
> + tcp_md5sig_pool_populated = true;
> +}
> +
> +static bool tcp_alloc_md5sig_pool(void)
> +{
> + if (unlikely(!tcp_md5sig_pool_populated)) {
> + mutex_lock(&tcp_md5sig_mutex);
> +
> + if (!tcp_md5sig_pool_populated)
> + __tcp_alloc_md5sig_pool();
> +
> + mutex_unlock(&tcp_md5sig_mutex);
> + }
> + return tcp_md5sig_pool_populated;
> +}
> +
> +static void tcp_put_md5sig_pool(void)
> +{
> + local_bh_enable();
> +}
> +
> +/**
> + * tcp_get_md5sig_pool - get md5sig_pool for this user
> + *
> + * We use percpu structure, so if we succeed, we exit with preemption
> + * and BH disabled, to make sure another thread or softirq handling
> + * wont try to get same context.
> + */
> +static struct tcp_md5sig_pool *tcp_get_md5sig_pool(void)
> +{
> + local_bh_disable();
> +
> + if (tcp_md5sig_pool_populated) {
> + /* coupled with smp_wmb() in __tcp_alloc_md5sig_pool() */
> + smp_rmb();
> + return this_cpu_ptr(&tcp_md5sig_pool);
> + }
> + local_bh_enable();
> + return NULL;
> +}
> +
> +static struct tcp_md5sig_key *tcp_md5_do_lookup_exact(const struct sock *sk,
> + const union tcp_md5_addr *addr,
> + int family, u8 prefixlen)
> +{
> + const struct tcp_sock *tp = tcp_sk(sk);
> + struct tcp_md5sig_key *key;
> + unsigned int size = sizeof(struct in_addr);
> + const struct tcp_md5sig_info *md5sig;
> +
> + /* caller either holds rcu_read_lock() or socket lock */
> + md5sig = rcu_dereference_check(tp->md5sig_info,
> + lockdep_sock_is_held(sk));
> + if (!md5sig)
> + return NULL;
> +#if IS_ENABLED(CONFIG_IPV6)
> + if (family == AF_INET6)
> + size = sizeof(struct in6_addr);
> +#endif
> + hlist_for_each_entry_rcu(key, &md5sig->head, node) {
> + if (key->family != family)
> + continue;
> + if (!memcmp(&key->addr, addr, size) &&
> + key->prefixlen == prefixlen)
> + return key;
> + }
> + return NULL;
> +}
> +
> +/* This can be called on a newly created socket, from other files */
> +static int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
> + int family, u8 prefixlen, const u8 *newkey,
> + u8 newkeylen, gfp_t gfp)
> +{
> + /* Add Key to the list */
> + struct tcp_md5sig_key *key;
> + struct tcp_sock *tp = tcp_sk(sk);
> + struct tcp_md5sig_info *md5sig;
> +
> + key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen);
> + if (key) {
> + /* Pre-existing entry - just update that one. */
> + memcpy(key->key, newkey, newkeylen);
> + key->keylen = newkeylen;
> + return 0;
> + }
> +
> + md5sig = rcu_dereference_protected(tp->md5sig_info,
> + lockdep_sock_is_held(sk));
> + if (!md5sig) {
> + md5sig = kmalloc(sizeof(*md5sig), gfp);
> + if (!md5sig)
> + return -ENOMEM;
> +
> + sk_nocaps_add(sk, NETIF_F_GSO_MASK);
> + INIT_HLIST_HEAD(&md5sig->head);
> + rcu_assign_pointer(tp->md5sig_info, md5sig);
> + }
> +
> + key = sock_kmalloc(sk, sizeof(*key), gfp);
> + if (!key)
> + return -ENOMEM;
> + if (!tcp_alloc_md5sig_pool()) {
> + sock_kfree_s(sk, key, sizeof(*key));
> + return -ENOMEM;
> + }
> +
> + memcpy(key->key, newkey, newkeylen);
> + key->keylen = newkeylen;
> + key->family = family;
> + key->prefixlen = prefixlen;
> + memcpy(&key->addr, addr,
> + (family == AF_INET6) ? sizeof(struct in6_addr) :
> + sizeof(struct in_addr));
> + hlist_add_head_rcu(&key->node, &md5sig->head);
> + return 0;
> +}
> +
> +static void tcp_clear_md5_list(struct sock *sk)
> +{
> + struct tcp_sock *tp = tcp_sk(sk);
> + struct tcp_md5sig_key *key;
> + struct hlist_node *n;
> + struct tcp_md5sig_info *md5sig;
> +
> + md5sig = rcu_dereference_protected(tp->md5sig_info, 1);
> +
> + hlist_for_each_entry_safe(key, n, &md5sig->head, node) {
> + hlist_del_rcu(&key->node);
> + atomic_sub(sizeof(*key), &sk->sk_omem_alloc);
> + kfree_rcu(key, rcu);
> + }
> +}
> +
> +static int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr,
> + int family, u8 prefixlen)
> +{
> + struct tcp_md5sig_key *key;
> +
> + key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen);
> + if (!key)
> + return -ENOENT;
> + hlist_del_rcu(&key->node);
> + atomic_sub(sizeof(*key), &sk->sk_omem_alloc);
> + kfree_rcu(key, rcu);
> + return 0;
> +}
> +
> +static int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
> + const struct tcp_md5sig_key *key)
> +{
> + struct scatterlist sg;
> +
> + sg_init_one(&sg, key->key, key->keylen);
> + ahash_request_set_crypt(hp->md5_req, &sg, NULL, key->keylen);
> + return crypto_ahash_update(hp->md5_req);
> +}
> +
> +static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
> + char __user *optval, int optlen)
> +{
> + struct tcp_md5sig cmd;
> + struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr;
> + u8 prefixlen = 32;
> +
> + if (optlen < sizeof(cmd))
> + return -EINVAL;
> +
> + if (copy_from_user(&cmd, optval, sizeof(cmd)))
> + return -EFAULT;
> +
> + if (sin->sin_family != AF_INET)
> + return -EINVAL;
> +
> + if (optname == TCP_MD5SIG_EXT &&
> + cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) {
> + prefixlen = cmd.tcpm_prefixlen;
> + if (prefixlen > 32)
> + return -EINVAL;
> + }
> +
> + if (!cmd.tcpm_keylen)
> + return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr,
> + AF_INET, prefixlen);
> +
> + if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
> + return -EINVAL;
> +
> + return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin->sin_addr.s_addr,
> + AF_INET, prefixlen, cmd.tcpm_key, cmd.tcpm_keylen,
> + GFP_KERNEL);
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
> + char __user *optval, int optlen)
> +{
> + struct tcp_md5sig cmd;
> + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
> + u8 prefixlen;
> +
> + if (optlen < sizeof(cmd))
> + return -EINVAL;
> +
> + if (copy_from_user(&cmd, optval, sizeof(cmd)))
> + return -EFAULT;
> +
> + if (sin6->sin6_family != AF_INET6)
> + return -EINVAL;
> +
> + if (optname == TCP_MD5SIG_EXT &&
> + cmd.tcpm_flags & TCP_MD5SIG_FLAG_PREFIX) {
> + prefixlen = cmd.tcpm_prefixlen;
> + if (prefixlen > 128 || (ipv6_addr_v4mapped(&sin6->sin6_addr) &&
> + prefixlen > 32))
> + return -EINVAL;
> + } else {
> + prefixlen = ipv6_addr_v4mapped(&sin6->sin6_addr) ? 32 : 128;
> + }
> +
> + if (!cmd.tcpm_keylen) {
> + if (ipv6_addr_v4mapped(&sin6->sin6_addr))
> + return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
> + AF_INET, prefixlen);
> + return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
> + AF_INET6, prefixlen);
> + }
> +
> + if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
> + return -EINVAL;
> +
> + if (ipv6_addr_v4mapped(&sin6->sin6_addr))
> + return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
> + AF_INET, prefixlen, cmd.tcpm_key,
> + cmd.tcpm_keylen, GFP_KERNEL);
> +
> + return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
> + AF_INET6, prefixlen, cmd.tcpm_key,
> + cmd.tcpm_keylen, GFP_KERNEL);
> +}
> +#endif
> +
> +static int tcp_v4_md5_hash_headers(struct tcp_md5sig_pool *hp,
> + __be32 daddr, __be32 saddr,
> + const struct tcphdr *th, int nbytes)
> +{
> + struct tcp4_pseudohdr *bp;
> + struct scatterlist sg;
> + struct tcphdr *_th;
> +
> + bp = hp->scratch;
> + bp->saddr = saddr;
> + bp->daddr = daddr;
> + bp->pad = 0;
> + bp->protocol = IPPROTO_TCP;
> + bp->len = cpu_to_be16(nbytes);
> +
> + _th = (struct tcphdr *)(bp + 1);
> + memcpy(_th, th, sizeof(*th));
> + _th->check = 0;
> +
> + sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
> + ahash_request_set_crypt(hp->md5_req, &sg, NULL,
> + sizeof(*bp) + sizeof(*th));
> + return crypto_ahash_update(hp->md5_req);
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
> + const struct in6_addr *daddr,
> + const struct in6_addr *saddr,
> + const struct tcphdr *th, int nbytes)
> +{
> + struct tcp6_pseudohdr *bp;
> + struct scatterlist sg;
> + struct tcphdr *_th;
> +
> + bp = hp->scratch;
> + /* 1. TCP pseudo-header (RFC2460) */
> + bp->saddr = *saddr;
> + bp->daddr = *daddr;
> + bp->protocol = cpu_to_be32(IPPROTO_TCP);
> + bp->len = cpu_to_be32(nbytes);
> +
> + _th = (struct tcphdr *)(bp + 1);
> + memcpy(_th, th, sizeof(*th));
> + _th->check = 0;
> +
> + sg_init_one(&sg, bp, sizeof(*bp) + sizeof(*th));
> + ahash_request_set_crypt(hp->md5_req, &sg, NULL,
> + sizeof(*bp) + sizeof(*th));
> + return crypto_ahash_update(hp->md5_req);
> +}
> +#endif
> +
> +static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
> + __be32 daddr, __be32 saddr,
> + const struct tcphdr *th)
> +{
> + struct tcp_md5sig_pool *hp;
> + struct ahash_request *req;
> +
> + hp = tcp_get_md5sig_pool();
> + if (!hp)
> + goto clear_hash_noput;
> + req = hp->md5_req;
> +
> + if (crypto_ahash_init(req))
> + goto clear_hash;
> + if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
> + goto clear_hash;
> + if (tcp_md5_hash_key(hp, key))
> + goto clear_hash;
> + ahash_request_set_crypt(req, NULL, md5_hash, 0);
> + if (crypto_ahash_final(req))
> + goto clear_hash;
> +
> + tcp_put_md5sig_pool();
> + return 0;
> +
> +clear_hash:
> + tcp_put_md5sig_pool();
> +clear_hash_noput:
> + memset(md5_hash, 0, 16);
> + return 1;
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +static int tcp_v6_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
> + const struct in6_addr *daddr,
> + struct in6_addr *saddr, const struct tcphdr *th)
> +{
> + struct tcp_md5sig_pool *hp;
> + struct ahash_request *req;
> +
> + hp = tcp_get_md5sig_pool();
> + if (!hp)
> + goto clear_hash_noput;
> + req = hp->md5_req;
> +
> + if (crypto_ahash_init(req))
> + goto clear_hash;
> + if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, th->doff << 2))
> + goto clear_hash;
> + if (tcp_md5_hash_key(hp, key))
> + goto clear_hash;
> + ahash_request_set_crypt(req, NULL, md5_hash, 0);
> + if (crypto_ahash_final(req))
> + goto clear_hash;
> +
> + tcp_put_md5sig_pool();
> + return 0;
> +
> +clear_hash:
> + tcp_put_md5sig_pool();
> +clear_hash_noput:
> + memset(md5_hash, 0, 16);
> + return 1;
> +}
> +#endif
> +
> +/* RFC2385 MD5 checksumming requires a mapping of
> + * IP address->MD5 Key.
> + * We need to maintain these in the sk structure.
> + */
> +
> +/* Find the Key structure for an address. */
> +static struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk,
> + const union tcp_md5_addr *addr,
> + int family)
> +{
> + const struct tcp_sock *tp = tcp_sk(sk);
> + struct tcp_md5sig_key *key;
> + const struct tcp_md5sig_info *md5sig;
> + __be32 mask;
> + struct tcp_md5sig_key *best_match = NULL;
> + bool match;
> +
> + /* caller either holds rcu_read_lock() or socket lock */
> + md5sig = rcu_dereference_check(tp->md5sig_info,
> + lockdep_sock_is_held(sk));
> + if (!md5sig)
> + return NULL;
> +
> + hlist_for_each_entry_rcu(key, &md5sig->head, node) {
> + if (key->family != family)
> + continue;
> +
> + if (family == AF_INET) {
> + mask = inet_make_mask(key->prefixlen);
> + match = (key->addr.a4.s_addr & mask) ==
> + (addr->a4.s_addr & mask);
> +#if IS_ENABLED(CONFIG_IPV6)
> + } else if (family == AF_INET6) {
> + match = ipv6_prefix_equal(&key->addr.a6, &addr->a6,
> + key->prefixlen);
> +#endif
> + } else {
> + match = false;
> + }
> +
> + if (match && (!best_match ||
> + key->prefixlen > best_match->prefixlen))
> + best_match = key;
> + }
> + return best_match;
> +}
> +
> +/* Parse MD5 Signature option */
> +static const u8 *tcp_parse_md5sig_option(const struct tcphdr *th)
> +{
> + int length = (th->doff << 2) - sizeof(*th);
> + const u8 *ptr = (const u8 *)(th + 1);
> +
> + /* If the TCP option is too short, we can short cut */
> + if (length < TCPOLEN_MD5SIG)
> + return NULL;
> +
> + while (length > 0) {
> + int opcode = *ptr++;
> + int opsize;
> +
> + switch (opcode) {
> + case TCPOPT_EOL:
> + return NULL;
> + case TCPOPT_NOP:
> + length--;
> + continue;
> + default:
> + opsize = *ptr++;
> + if (opsize < 2 || opsize > length)
> + return NULL;
> + if (opcode == TCPOPT_MD5SIG)
> + return opsize == TCPOLEN_MD5SIG ? ptr : NULL;
> + }
> + ptr += opsize - 2;
> + length -= opsize;
> + }
> + return NULL;
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
> + const struct in6_addr *addr)
> +{
> + return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
> +}
> +#endif
> +
> +static int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *hp,
> + const struct sk_buff *skb,
> + unsigned int header_len)
> +{
> + struct scatterlist sg;
> + const struct tcphdr *tp = tcp_hdr(skb);
> + struct ahash_request *req = hp->md5_req;
> + unsigned int i;
> + const unsigned int head_data_len = skb_headlen(skb) > header_len ?
> + skb_headlen(skb) - header_len : 0;
> + const struct skb_shared_info *shi = skb_shinfo(skb);
> + struct sk_buff *frag_iter;
> +
> + sg_init_table(&sg, 1);
> +
> + sg_set_buf(&sg, ((u8 *)tp) + header_len, head_data_len);
> + ahash_request_set_crypt(req, &sg, NULL, head_data_len);
> + if (crypto_ahash_update(req))
> + return 1;
> +
> + for (i = 0; i < shi->nr_frags; ++i) {
> + const struct skb_frag_struct *f = &shi->frags[i];
> + unsigned int offset = f->page_offset;
> + struct page *page = skb_frag_page(f) + (offset >> PAGE_SHIFT);
> +
> + sg_set_page(&sg, page, skb_frag_size(f),
> + offset_in_page(offset));
> + ahash_request_set_crypt(req, &sg, NULL, skb_frag_size(f));
> + if (crypto_ahash_update(req))
> + return 1;
> + }
> +
> + skb_walk_frags(skb, frag_iter)
> + if (tcp_md5_hash_skb_data(hp, frag_iter, 0))
> + return 1;
> +
> + return 0;
> +}
> +
> +int tcp_v4_md5_send_response_prepare(struct sk_buff *skb, u8 flags,
> + unsigned int remaining,
> + struct tcp_out_options *opts,
> + const struct sock *sk)
> +{
> + const struct tcphdr *th = tcp_hdr(skb);
> + const struct iphdr *iph = ip_hdr(skb);
> + const __u8 *hash_location = NULL;
> +
> + rcu_read_lock();
> + hash_location = tcp_parse_md5sig_option(th);
> + if (sk && sk_fullsock(sk)) {
> + opts->md5 = tcp_md5_do_lookup(sk,
> + (union tcp_md5_addr *)&iph->saddr,
> + AF_INET);
> + } else if (sk && sk->sk_state == TCP_TIME_WAIT) {
> + struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
> +
> + opts->md5 = tcp_twsk_md5_key(tcptw);
> + } else if (sk && sk->sk_state == TCP_NEW_SYN_RECV) {
> + opts->md5 = tcp_md5_do_lookup(sk,
> + (union tcp_md5_addr *)&iph->saddr,
> + AF_INET);
> + } else if (hash_location) {
> + unsigned char newhash[16];
> + struct sock *sk1;
> + int genhash;
> +
> + /* active side is lost. Try to find listening socket through
> + * source port, and then find md5 key through listening socket.
> + * we are not loose security here:
> + * Incoming packet is checked with md5 hash with finding key,
> + * no RST generated if md5 hash doesn't match.
> + */
> + sk1 = __inet_lookup_listener(dev_net(skb_dst(skb)->dev),
> + &tcp_hashinfo, NULL, 0,
> + iph->saddr,
> + th->source, iph->daddr,
> + ntohs(th->source), inet_iif(skb),
> + tcp_v4_sdif(skb));
> + /* don't send rst if it can't find key */
> + if (!sk1)
> + goto out_err;
> +
> + opts->md5 = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *)
> + &iph->saddr, AF_INET);
> + if (!opts->md5)
> + goto out_err;
> +
> + genhash = tcp_v4_md5_hash_skb(newhash, opts->md5, NULL, skb);
> + if (genhash || memcmp(hash_location, newhash, 16) != 0)
> + goto out_err;
> + }
> +
> + if (opts->md5)
> + return TCPOLEN_MD5SIG_ALIGNED;
> +
> + rcu_read_unlock();
> + return 0;
> +
> +out_err:
> + rcu_read_unlock();
> + return -1;
> +}
> +
> +void tcp_v4_md5_send_response_write(__be32 *topt, struct sk_buff *skb,
> + struct tcphdr *t1,
> + struct tcp_out_options *opts,
> + const struct sock *sk)
> +{
> + if (opts->md5) {
> + *topt++ = htonl((TCPOPT_NOP << 24) |
> + (TCPOPT_NOP << 16) |
> + (TCPOPT_MD5SIG << 8) |
> + TCPOLEN_MD5SIG);
> +
> + tcp_v4_md5_hash_hdr((__u8 *)topt, opts->md5,
> + ip_hdr(skb)->saddr,
> + ip_hdr(skb)->daddr, t1);
> + rcu_read_unlock();
> + }
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +int tcp_v6_md5_send_response_prepare(struct sk_buff *skb, u8 flags,
> + unsigned int remaining,
> + struct tcp_out_options *opts,
> + const struct sock *sk)
> +{
> + const struct tcphdr *th = tcp_hdr(skb);
> + struct ipv6hdr *ipv6h = ipv6_hdr(skb);
> + const __u8 *hash_location = NULL;
> +
> + rcu_read_lock();
> + hash_location = tcp_parse_md5sig_option(th);
> + if (sk && sk_fullsock(sk)) {
> + opts->md5 = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
> + } else if (sk && sk->sk_state == TCP_TIME_WAIT) {
> + struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
> +
> + opts->md5 = tcp_twsk_md5_key(tcptw);
> + } else if (sk && sk->sk_state == TCP_NEW_SYN_RECV) {
> + opts->md5 = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
> + } else if (hash_location) {
> + unsigned char newhash[16];
> + struct sock *sk1;
> + int genhash;
> +
> + /* active side is lost. Try to find listening socket through
> + * source port, and then find md5 key through listening socket.
> + * we are not loose security here:
> + * Incoming packet is checked with md5 hash with finding key,
> + * no RST generated if md5 hash doesn't match.
> + */
> + sk1 = inet6_lookup_listener(dev_net(skb_dst(skb)->dev),
> + &tcp_hashinfo, NULL, 0,
> + &ipv6h->saddr,
> + th->source, &ipv6h->daddr,
> + ntohs(th->source), tcp_v6_iif(skb),
> + tcp_v6_sdif(skb));
> + if (!sk1)
> + goto out_err;
> +
> + opts->md5 = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
> + if (!opts->md5)
> + goto out_err;
> +
> + genhash = tcp_v6_md5_hash_skb(newhash, opts->md5, NULL, skb);
> + if (genhash || memcmp(hash_location, newhash, 16) != 0)
> + goto out_err;
> + }
> +
> + if (opts->md5)
> + return TCPOLEN_MD5SIG_ALIGNED;
> +
> + rcu_read_unlock();
> + return 0;
> +
> +out_err:
> + rcu_read_unlock();
> + return -1;
> +}
> +EXPORT_SYMBOL_GPL(tcp_v6_md5_send_response_prepare);
> +
> +void tcp_v6_md5_send_response_write(__be32 *topt, struct sk_buff *skb,
> + struct tcphdr *t1,
> + struct tcp_out_options *opts,
> + const struct sock *sk)
> +{
> + if (opts->md5) {
> + *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
> + (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
> + tcp_v6_md5_hash_hdr((__u8 *)topt, opts->md5,
> + &ipv6_hdr(skb)->saddr,
> + &ipv6_hdr(skb)->daddr, t1);
> +
> + rcu_read_unlock();
> + }
> +}
> +EXPORT_SYMBOL_GPL(tcp_v6_md5_send_response_write);
> +#endif
> +
> +struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk,
> + const struct sock *addr_sk)
> +{
> + const union tcp_md5_addr *addr;
> +
> + addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr;
> + return tcp_md5_do_lookup(sk, addr, AF_INET);
> +}
> +EXPORT_SYMBOL(tcp_v4_md5_lookup);
> +
> +int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
> + const struct sock *sk,
> + const struct sk_buff *skb)
> +{
> + struct tcp_md5sig_pool *hp;
> + struct ahash_request *req;
> + const struct tcphdr *th = tcp_hdr(skb);
> + __be32 saddr, daddr;
> +
> + if (sk) { /* valid for establish/request sockets */
> + saddr = sk->sk_rcv_saddr;
> + daddr = sk->sk_daddr;
> + } else {
> + const struct iphdr *iph = ip_hdr(skb);
> +
> + saddr = iph->saddr;
> + daddr = iph->daddr;
> + }
> +
> + hp = tcp_get_md5sig_pool();
> + if (!hp)
> + goto clear_hash_noput;
> + req = hp->md5_req;
> +
> + if (crypto_ahash_init(req))
> + goto clear_hash;
> +
> + if (tcp_v4_md5_hash_headers(hp, daddr, saddr, th, skb->len))
> + goto clear_hash;
> + if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
> + goto clear_hash;
> + if (tcp_md5_hash_key(hp, key))
> + goto clear_hash;
> + ahash_request_set_crypt(req, NULL, md5_hash, 0);
> + if (crypto_ahash_final(req))
> + goto clear_hash;
> +
> + tcp_put_md5sig_pool();
> + return 0;
> +
> +clear_hash:
> + tcp_put_md5sig_pool();
> +clear_hash_noput:
> + memset(md5_hash, 0, 16);
> + return 1;
> +}
> +EXPORT_SYMBOL(tcp_v4_md5_hash_skb);
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +int tcp_v6_md5_hash_skb(char *md5_hash,
> + const struct tcp_md5sig_key *key,
> + const struct sock *sk,
> + const struct sk_buff *skb)
> +{
> + const struct in6_addr *saddr, *daddr;
> + struct tcp_md5sig_pool *hp;
> + struct ahash_request *req;
> + const struct tcphdr *th = tcp_hdr(skb);
> +
> + if (sk) { /* valid for establish/request sockets */
> + saddr = &sk->sk_v6_rcv_saddr;
> + daddr = &sk->sk_v6_daddr;
> + } else {
> + const struct ipv6hdr *ip6h = ipv6_hdr(skb);
> +
> + saddr = &ip6h->saddr;
> + daddr = &ip6h->daddr;
> + }
> +
> + hp = tcp_get_md5sig_pool();
> + if (!hp)
> + goto clear_hash_noput;
> + req = hp->md5_req;
> +
> + if (crypto_ahash_init(req))
> + goto clear_hash;
> +
> + if (tcp_v6_md5_hash_headers(hp, daddr, saddr, th, skb->len))
> + goto clear_hash;
> + if (tcp_md5_hash_skb_data(hp, skb, th->doff << 2))
> + goto clear_hash;
> + if (tcp_md5_hash_key(hp, key))
> + goto clear_hash;
> + ahash_request_set_crypt(req, NULL, md5_hash, 0);
> + if (crypto_ahash_final(req))
> + goto clear_hash;
> +
> + tcp_put_md5sig_pool();
> + return 0;
> +
> +clear_hash:
> + tcp_put_md5sig_pool();
> +clear_hash_noput:
> + memset(md5_hash, 0, 16);
> + return 1;
> +}
> +EXPORT_SYMBOL_GPL(tcp_v6_md5_hash_skb);
> +#endif
> +
> +/* Called with rcu_read_lock() */
> +bool tcp_v4_inbound_md5_hash(const struct sock *sk,
> + const struct sk_buff *skb)
> +{
> + /* This gets called for each TCP segment that arrives
> + * so we want to be efficient.
> + * We have 3 drop cases:
> + * o No MD5 hash and one expected.
> + * o MD5 hash and we're not expecting one.
> + * o MD5 hash and its wrong.
> + */
> + const __u8 *hash_location = NULL;
> + struct tcp_md5sig_key *hash_expected;
> + const struct iphdr *iph = ip_hdr(skb);
> + const struct tcphdr *th = tcp_hdr(skb);
> + int genhash;
> + unsigned char newhash[16];
> +
> + hash_expected = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&iph->saddr,
> + AF_INET);
> + hash_location = tcp_parse_md5sig_option(th);
> +
> + /* We've parsed the options - do we have a hash? */
> + if (!hash_expected && !hash_location)
> + return false;
> +
> + if (hash_expected && !hash_location) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
> + return true;
> + }
> +
> + if (!hash_expected && hash_location) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
> + return true;
> + }
> +
> + /* Okay, so this is hash_expected and hash_location -
> + * so we need to calculate the checksum.
> + */
> + genhash = tcp_v4_md5_hash_skb(newhash,
> + hash_expected,
> + NULL, skb);
> +
> + if (genhash || memcmp(hash_location, newhash, 16) != 0) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
> + net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n",
> + &iph->saddr, ntohs(th->source),
> + &iph->daddr, ntohs(th->dest),
> + genhash ? " tcp_v4_calc_md5_hash failed"
> + : "");
> + return true;
> + }
> + return false;
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +bool tcp_v6_inbound_md5_hash(const struct sock *sk,
> + const struct sk_buff *skb)
> +{
> + const __u8 *hash_location = NULL;
> + struct tcp_md5sig_key *hash_expected;
> + const struct ipv6hdr *ip6h = ipv6_hdr(skb);
> + const struct tcphdr *th = tcp_hdr(skb);
> + int genhash;
> + u8 newhash[16];
> +
> + hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
> + hash_location = tcp_parse_md5sig_option(th);
> +
> + /* We've parsed the options - do we have a hash? */
> + if (!hash_expected && !hash_location)
> + return false;
> +
> + if (hash_expected && !hash_location) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5NOTFOUND);
> + return true;
> + }
> +
> + if (!hash_expected && hash_location) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5UNEXPECTED);
> + return true;
> + }
> +
> + /* check the signature */
> + genhash = tcp_v6_md5_hash_skb(newhash,
> + hash_expected,
> + NULL, skb);
> +
> + if (genhash || memcmp(hash_location, newhash, 16) != 0) {
> + NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
> + net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
> + genhash ? "failed" : "mismatch",
> + &ip6h->saddr, ntohs(th->source),
> + &ip6h->daddr, ntohs(th->dest));
> + return true;
> + }
> +
> + return false;
> +}
> +EXPORT_SYMBOL_GPL(tcp_v6_inbound_md5_hash);
> +#endif
> +
> +void tcp_v4_md5_destroy_sock(struct sock *sk)
> +{
> + struct tcp_sock *tp = tcp_sk(sk);
> +
> + /* Clean up the MD5 key list, if any */
> + if (tp->md5sig_info) {
> + tcp_clear_md5_list(sk);
> + kfree_rcu(tp->md5sig_info, rcu);
> + tp->md5sig_info = NULL;
> + }
> +}
> +
> +void tcp_v4_md5_syn_recv_sock(const struct sock *listener, struct sock *sk)
> +{
> + struct inet_sock *inet = inet_sk(sk);
> + struct tcp_md5sig_key *key;
> +
> + /* Copy over the MD5 key from the original socket */
> + key = tcp_md5_do_lookup(listener, (union tcp_md5_addr *)&inet->inet_daddr,
> + AF_INET);
> + if (key) {
> + /* We're using one, so create a matching key
> + * on the sk structure. If we fail to get
> + * memory, then we end up not copying the key
> + * across. Shucks.
> + */
> + tcp_md5_do_add(sk, (union tcp_md5_addr *)&inet->inet_daddr,
> + AF_INET, 32, key->key, key->keylen, GFP_ATOMIC);
> + sk_nocaps_add(sk, NETIF_F_GSO_MASK);
> + }
> +}
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +void tcp_v6_md5_syn_recv_sock(const struct sock *listener, struct sock *sk)
> +{
> + struct tcp_md5sig_key *key;
> +
> + /* Copy over the MD5 key from the original socket */
> + key = tcp_v6_md5_do_lookup(listener, &sk->sk_v6_daddr);
> + if (key) {
> + /* We're using one, so create a matching key
> + * on the newsk structure. If we fail to get
> + * memory, then we end up not copying the key
> + * across. Shucks.
> + */
> + tcp_md5_do_add(sk, (union tcp_md5_addr *)&sk->sk_v6_daddr,
> + AF_INET6, 128, key->key, key->keylen,
> + sk_gfp_mask(sk, GFP_ATOMIC));
> + }
> +}
> +EXPORT_SYMBOL_GPL(tcp_v6_md5_syn_recv_sock);
> +
> +struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
> + const struct sock *addr_sk)
> +{
> + return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
> +}
> +EXPORT_SYMBOL_GPL(tcp_v6_md5_lookup);
> +#endif
> +
> +void tcp_md5_time_wait(struct sock *sk, struct inet_timewait_sock *tw)
> +{
> + struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
> + struct tcp_sock *tp = tcp_sk(sk);
> + struct tcp_md5sig_key *key;
> +
> + /* The timewait bucket does not have the key DB from the
> + * sock structure. We just make a quick copy of the
> + * md5 key being used (if indeed we are using one)
> + * so the timewait ack generating code has the key.
> + */
> + tcptw->tw_md5_key = NULL;
> + key = tp->af_specific->md5_lookup(sk, sk);
> + if (key) {
> + tcptw->tw_md5_key = kmemdup(key, sizeof(*key), GFP_ATOMIC);
> + BUG_ON(tcptw->tw_md5_key && !tcp_alloc_md5sig_pool());
> + }
> +}
> +
> +static void tcp_diag_md5sig_fill(struct tcp_diag_md5sig *info,
> + const struct tcp_md5sig_key *key)
> +{
> + info->tcpm_family = key->family;
> + info->tcpm_prefixlen = key->prefixlen;
> + info->tcpm_keylen = key->keylen;
> + memcpy(info->tcpm_key, key->key, key->keylen);
> +
> + if (key->family == AF_INET)
> + info->tcpm_addr[0] = key->addr.a4.s_addr;
> + #if IS_ENABLED(CONFIG_IPV6)
> + else if (key->family == AF_INET6)
> + memcpy(&info->tcpm_addr, &key->addr.a6,
> + sizeof(info->tcpm_addr));
> + #endif
> +}
> +
> +static int tcp_diag_put_md5sig(struct sk_buff *skb,
> + const struct tcp_md5sig_info *md5sig)
> +{
> + const struct tcp_md5sig_key *key;
> + struct tcp_diag_md5sig *info;
> + struct nlattr *attr;
> + int md5sig_count = 0;
> +
> + hlist_for_each_entry_rcu(key, &md5sig->head, node)
> + md5sig_count++;
> + if (md5sig_count == 0)
> + return 0;
> +
> + attr = nla_reserve(skb, INET_DIAG_MD5SIG,
> + md5sig_count * sizeof(struct tcp_diag_md5sig));
> + if (!attr)
> + return -EMSGSIZE;
> +
> + info = nla_data(attr);
> + memset(info, 0, md5sig_count * sizeof(struct tcp_diag_md5sig));
> + hlist_for_each_entry_rcu(key, &md5sig->head, node) {
> + tcp_diag_md5sig_fill(info++, key);
> + if (--md5sig_count == 0)
> + break;
> + }
> +
> + return 0;
> +}
> +
> +int tcp_md5_diag_get_aux(struct sock *sk, bool net_admin, struct sk_buff *skb)
> +{
> + if (net_admin) {
> + struct tcp_md5sig_info *md5sig;
> + int err = 0;
> +
> + rcu_read_lock();
> + md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
> + if (md5sig)
> + err = tcp_diag_put_md5sig(skb, md5sig);
> + rcu_read_unlock();
> + if (err < 0)
> + return err;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(tcp_md5_diag_get_aux);
> +
> +int tcp_md5_diag_get_aux_size(struct sock *sk, bool net_admin)
> +{
> + int size = 0;
> +
> + if (net_admin && sk_fullsock(sk)) {
> + const struct tcp_md5sig_info *md5sig;
> + const struct tcp_md5sig_key *key;
> + size_t md5sig_count = 0;
> +
> + rcu_read_lock();
> + md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
> + if (md5sig) {
> + hlist_for_each_entry_rcu(key, &md5sig->head, node)
> + md5sig_count++;
> + }
> + rcu_read_unlock();
> + size += nla_total_size(md5sig_count *
> + sizeof(struct tcp_diag_md5sig));
> + }
> +
> + return size;
> +}
> +EXPORT_SYMBOL_GPL(tcp_md5_diag_get_aux_size);
> +
> +const struct tcp_sock_af_ops tcp_sock_ipv4_specific = {
> + .md5_lookup = tcp_v4_md5_lookup,
> + .calc_md5_hash = tcp_v4_md5_hash_skb,
> + .md5_parse = tcp_v4_parse_md5_keys,
> +};
> +
> +#if IS_ENABLED(CONFIG_IPV6)
> +const struct tcp_sock_af_ops tcp_sock_ipv6_specific = {
> + .md5_lookup = tcp_v6_md5_lookup,
> + .calc_md5_hash = tcp_v6_md5_hash_skb,
> + .md5_parse = tcp_v6_parse_md5_keys,
> +};
> +EXPORT_SYMBOL_GPL(tcp_sock_ipv6_specific);
> +
> +const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = {
> + .md5_lookup = tcp_v4_md5_lookup,
> + .calc_md5_hash = tcp_v4_md5_hash_skb,
> + .md5_parse = tcp_v6_parse_md5_keys,
> +};
> +EXPORT_SYMBOL_GPL(tcp_sock_ipv6_mapped_specific);
> +#endif
--
Mat Martineau
Intel OTC
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