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Message-id: <20171218215109.38700-12-cpaasch@apple.com>
Date: Mon, 18 Dec 2017 13:51:06 -0800
From: Christoph Paasch <cpaasch@...le.com>
To: netdev@...r.kernel.org
Cc: Eric Dumazet <edumazet@...gle.com>,
Mat Martineau <mathew.j.martineau@...ux.intel.com>,
Alexei Starovoitov <ast@...nel.org>
Subject: [RFC 11/14] tcp_md5: Move TCP-MD5 code out of TCP itself
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/inet_diag.h b/include/linux/inet_diag.h
index 39faaaf843e1..1ef6727e41c9 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h
@@ -2,6 +2,7 @@
#ifndef _INET_DIAG_H_
#define _INET_DIAG_H_ 1
+#include <linux/user_namespace.h>
#include <uapi/linux/inet_diag.h>
struct net;
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 @@
+#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/include/net/tcp.h b/include/net/tcp.h
index a5c4856e25c7..e955c5f0997f 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -406,7 +406,6 @@ void tcp_parse_options(const struct net *net, const struct sk_buff *skb,
struct tcp_options_received *opt_rx,
int estab, struct tcp_fastopen_cookie *foc,
struct sock *sk);
-const u8 *tcp_parse_md5sig_option(const struct tcphdr *th);
/*
* TCP v4 functions exported for the inet6 API
@@ -1415,30 +1414,6 @@ static inline void tcp_clear_all_retrans_hints(struct tcp_sock *tp)
tp->retransmit_skb_hint = NULL;
}
-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;
-};
-
/* - pseudo header */
struct tcp4_pseudohdr {
__be32 saddr;
@@ -1455,58 +1430,6 @@ struct tcp6_pseudohdr {
__be32 protocol; /* including padding */
};
-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;
-};
-
-/* - 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);
-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);
-int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr,
- int family, u8 prefixlen);
-struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk,
- const struct sock *addr_sk);
-
-#ifdef CONFIG_TCP_MD5SIG
-struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk,
- const union tcp_md5_addr *addr,
- int family);
-#define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_key)
-#else
-static inline struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk,
- const union tcp_md5_addr *addr,
- int family)
-{
- return NULL;
-}
-#define tcp_twsk_md5_key(twsk) NULL
-#endif
-
-bool tcp_alloc_md5sig_pool(void);
-
-struct tcp_md5sig_pool *tcp_get_md5sig_pool(void);
-static inline void tcp_put_md5sig_pool(void)
-{
- local_bh_enable();
-}
-
-int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, const struct sk_buff *,
- unsigned int header_len);
-int tcp_md5_hash_key(struct tcp_md5sig_pool *hp,
- const struct tcp_md5sig_key *key);
-
/* From tcp_fastopen.c */
void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
struct tcp_fastopen_cookie *cookie);
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index c6c8ad1d4b6d..9262d9a01035 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
+obj-$(CONFIG_TCP_MD5SIG) += tcp_md5.o
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
xfrm4_output.o xfrm4_protocol.o
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 0a1cabee6d5e..29f3ce8a0b54 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -271,6 +271,7 @@
#include <linux/slab.h>
#include <linux/errqueue.h>
#include <linux/static_key.h>
+#include <linux/tcp_md5.h>
#include <net/icmp.h>
#include <net/inet_common.h>
@@ -3337,138 +3338,6 @@ int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
EXPORT_SYMBOL(compat_tcp_getsockopt);
#endif
-#ifdef CONFIG_TCP_MD5SIG
-static DEFINE_PER_CPU(struct tcp_md5sig_pool, tcp_md5sig_pool);
-static DEFINE_MUTEX(tcp_md5sig_mutex);
-static bool tcp_md5sig_pool_populated = false;
-
-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;
-}
-
-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;
-}
-EXPORT_SYMBOL(tcp_alloc_md5sig_pool);
-
-
-/**
- * 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.
- */
-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;
-}
-EXPORT_SYMBOL(tcp_get_md5sig_pool);
-
-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;
-}
-EXPORT_SYMBOL(tcp_md5_hash_skb_data);
-
-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);
-}
-EXPORT_SYMBOL(tcp_md5_hash_key);
-
-#endif
-
struct hlist_head *tcp_extopt_get_list(const struct sock *sk)
{
if (sk_fullsock(sk))
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index abbf0edcf6c2..5cfe5dc8f8dd 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -15,6 +15,7 @@
#include <linux/inet_diag.h>
#include <linux/tcp.h>
+#include <linux/tcp_md5.h>
#include <net/netlink.h>
#include <net/tcp.h>
@@ -37,70 +38,14 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
tcp_get_info(sk, info);
}
-#ifdef CONFIG_TCP_MD5SIG
-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;
-}
-#endif
-
static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
struct sk_buff *skb)
{
#ifdef CONFIG_TCP_MD5SIG
- 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;
- }
+ int err = tcp_md5_diag_get_aux(sk, net_admin, skb);
+
+ if (err < 0)
+ return err;
#endif
return 0;
@@ -111,21 +56,7 @@ static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
size_t size = 0;
#ifdef CONFIG_TCP_MD5SIG
- 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));
- }
+ size += tcp_md5_diag_get_aux_size(sk, net_admin);
#endif
return size;
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index af8f4f9fd098..db54bdbdee51 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3847,44 +3847,6 @@ static bool tcp_fast_parse_options(const struct net *net,
return false;
}
-#ifdef CONFIG_TCP_MD5SIG
-/*
- * Parse MD5 Signature option
- */
-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;
-}
-EXPORT_SYMBOL(tcp_parse_md5sig_option);
-#endif
-
/* Sorry, PAWS as specified is broken wrt. pure-ACKs -DaveM
*
* It is not fatal. If this ACK does _not_ change critical state (seqs, window)
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 397975203e14..143e1f66a24a 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -62,6 +62,7 @@
#include <linux/init.h>
#include <linux/times.h>
#include <linux/slab.h>
+#include <linux/tcp_md5.h>
#include <net/net_namespace.h>
#include <net/icmp.h>
@@ -87,11 +88,6 @@
#include <trace/events/tcp.h>
-#ifdef CONFIG_TCP_MD5SIG
-static int tcp_v4_md5_hash_hdr(char *md5_hash, const struct tcp_md5sig_key *key,
- __be32 daddr, __be32 saddr, const struct tcphdr *th);
-#endif
-
struct inet_hashinfo tcp_hashinfo;
EXPORT_SYMBOL(tcp_hashinfo);
@@ -603,16 +599,13 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
__be32 opt[(MAX_TCP_OPTION_SPACE >> 2)];
} rep;
struct hlist_head *extopt_list = NULL;
+ struct tcp_out_options opts;
struct ip_reply_arg arg;
-#ifdef CONFIG_TCP_MD5SIG
- struct tcp_md5sig_key *key = NULL;
- const __u8 *hash_location = NULL;
- unsigned char newhash[16];
- int genhash;
- struct sock *sk1 = NULL;
-#endif
struct net *net;
int offset = 0;
+#ifdef CONFIG_TCP_MD5SIG
+ int ret;
+#endif
/* Never send a reset in response to a reset. */
if (th->rst)
@@ -627,6 +620,8 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
if (sk)
extopt_list = tcp_extopt_get_list(sk);
+ memset(&opts, 0, sizeof(opts));
+
/* Swap the send and the receive. */
memset(&rep, 0, sizeof(rep));
rep.th.dest = th->source;
@@ -647,55 +642,28 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
arg.iov[0].iov_len = sizeof(rep.th);
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
-#ifdef CONFIG_TCP_MD5SIG
- rcu_read_lock();
- hash_location = tcp_parse_md5sig_option(th);
- if (sk && sk_fullsock(sk)) {
- key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)
- &ip_hdr(skb)->saddr, AF_INET);
- } else if (hash_location) {
- /*
- * 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(net, &tcp_hashinfo, NULL, 0,
- ip_hdr(skb)->saddr,
- th->source, ip_hdr(skb)->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;
-
- key = tcp_md5_do_lookup(sk1, (union tcp_md5_addr *)
- &ip_hdr(skb)->saddr, AF_INET);
- if (!key)
- goto out;
+#ifdef CONFIG_TCP_MD5SIG
+ ret = tcp_v4_md5_send_response_prepare(skb, 0,
+ MAX_TCP_OPTION_SPACE - arg.iov[0].iov_len,
+ &opts, sk);
- genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb);
- if (genhash || memcmp(hash_location, newhash, 16) != 0)
- goto out;
+ if (ret == -1)
+ return;
- }
+ arg.iov[0].iov_len += ret;
#endif
if (unlikely(extopt_list && !hlist_empty(extopt_list))) {
unsigned int remaining;
- struct tcp_out_options opts;
int used;
remaining = sizeof(rep.opt);
#ifdef CONFIG_TCP_MD5SIG
- if (key)
+ if (opts.md5)
remaining -= TCPOLEN_MD5SIG_ALIGNED;
#endif
- memset(&opts, 0, sizeof(opts));
-
used = tcp_extopt_response_prepare(skb, TCPHDR_RST, remaining,
&opts, sk);
@@ -707,19 +675,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
}
#ifdef CONFIG_TCP_MD5SIG
- if (key) {
- rep.opt[offset++] = htonl((TCPOPT_NOP << 24) |
- (TCPOPT_NOP << 16) |
- (TCPOPT_MD5SIG << 8) |
- TCPOLEN_MD5SIG);
- /* Update length and the length the header thinks exists */
- arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED;
- rep.th.doff = arg.iov[0].iov_len / 4;
-
- tcp_v4_md5_hash_hdr((__u8 *)&rep.opt[offset],
- key, ip_hdr(skb)->saddr,
- ip_hdr(skb)->daddr, &rep.th);
- }
+ tcp_v4_md5_send_response_write(&rep.opt[offset], skb, &rep.th, &opts, sk);
#endif
arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
ip_hdr(skb)->saddr, /* XXX */
@@ -750,11 +706,6 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
__TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
__TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
local_bh_enable();
-
-#ifdef CONFIG_TCP_MD5SIG
-out:
- rcu_read_unlock();
-#endif
}
/* The code following below sending ACKs in SYN-RECV and TIME-WAIT states
@@ -772,17 +723,19 @@ static void tcp_v4_send_ack(const struct sock *sk,
__be32 opt[(MAX_TCP_OPTION_SPACE >> 2)];
} rep;
struct hlist_head *extopt_list = NULL;
-#ifdef CONFIG_TCP_MD5SIG
- struct tcp_md5sig_key *key;
-#endif
+ struct tcp_out_options opts;
struct net *net = sock_net(sk);
struct ip_reply_arg arg;
int offset = 0;
+#ifdef CONFIG_TCP_MD5SIG
+ int ret;
+#endif
extopt_list = tcp_extopt_get_list(sk);
memset(&rep.th, 0, sizeof(struct tcphdr));
memset(&arg, 0, sizeof(arg));
+ memset(&opts, 0, sizeof(opts));
arg.iov[0].iov_base = (unsigned char *)&rep;
arg.iov[0].iov_len = sizeof(rep.th);
@@ -806,25 +759,24 @@ static void tcp_v4_send_ack(const struct sock *sk,
rep.th.window = htons(win);
#ifdef CONFIG_TCP_MD5SIG
- if (sk->sk_state == TCP_TIME_WAIT) {
- key = tcp_twsk_md5_key(tcp_twsk(sk));
- } else if (sk->sk_state == TCP_NEW_SYN_RECV) {
- key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&ip_hdr(skb)->saddr,
- AF_INET);
- } else {
- key = NULL; /* Should not happen */
- }
+ ret = tcp_v4_md5_send_response_prepare(skb, 0,
+ MAX_TCP_OPTION_SPACE - arg.iov[0].iov_len,
+ &opts, sk);
+
+ if (ret == -1)
+ return;
+
+ arg.iov[0].iov_len += ret;
#endif
if (unlikely(extopt_list && !hlist_empty(extopt_list))) {
unsigned int remaining;
- struct tcp_out_options opts;
int used;
remaining = sizeof(rep.th) + sizeof(rep.opt) - arg.iov[0].iov_len;
#ifdef CONFIG_TCP_MD5SIG
- if (key)
+ if (opts.md5)
remaining -= TCPOLEN_MD5SIG_ALIGNED;
#endif
@@ -841,18 +793,11 @@ static void tcp_v4_send_ack(const struct sock *sk,
}
#ifdef CONFIG_TCP_MD5SIG
- if (key) {
- rep.opt[offset++] = htonl((TCPOPT_NOP << 24) |
- (TCPOPT_NOP << 16) |
- (TCPOPT_MD5SIG << 8) |
- TCPOLEN_MD5SIG);
+ if (opts.md5) {
arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED;
rep.th.doff = arg.iov[0].iov_len / 4;
-
- tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset],
- key, ip_hdr(skb)->saddr,
- ip_hdr(skb)->daddr, &rep.th);
}
+ tcp_v4_md5_send_response_write(&rep.opt[offset], skb, &rep.th, &opts, sk);
#endif
arg.flags = reply_flags;
@@ -961,374 +906,6 @@ static void tcp_v4_reqsk_destructor(struct request_sock *req)
kfree(rcu_dereference_protected(inet_rsk(req)->ireq_opt, 1));
}
-#ifdef CONFIG_TCP_MD5SIG
-/*
- * 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. */
-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;
-}
-EXPORT_SYMBOL(tcp_md5_do_lookup);
-
-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;
-}
-
-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);
-
-/* This can be called on a newly created socket, from other files */
-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;
-}
-EXPORT_SYMBOL(tcp_md5_do_add);
-
-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;
-}
-EXPORT_SYMBOL(tcp_md5_do_del);
-
-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_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);
-}
-
-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);
-}
-
-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;
-}
-
-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);
-
-#endif
-
-/* Called with rcu_read_lock() */
-static bool tcp_v4_inbound_md5_hash(const struct sock *sk,
- const struct sk_buff *skb)
-{
-#ifdef CONFIG_TCP_MD5SIG
- /*
- * 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;
-#endif
- return false;
-}
-
static void tcp_v4_init_req(struct request_sock *req,
const struct sock *sk_listener,
struct sk_buff *skb)
@@ -1404,9 +981,6 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
struct inet_sock *newinet;
struct tcp_sock *newtp;
struct sock *newsk;
-#ifdef CONFIG_TCP_MD5SIG
- struct tcp_md5sig_key *key;
-#endif
struct ip_options_rcu *inet_opt;
if (sk_acceptq_is_full(sk))
@@ -1453,20 +1027,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
tcp_initialize_rcv_mss(newsk);
#ifdef CONFIG_TCP_MD5SIG
- /* Copy over the MD5 key from the original socket */
- key = tcp_md5_do_lookup(sk, (union tcp_md5_addr *)&newinet->inet_daddr,
- AF_INET);
- 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(newsk, (union tcp_md5_addr *)&newinet->inet_daddr,
- AF_INET, 32, key->key, key->keylen, GFP_ATOMIC);
- sk_nocaps_add(newsk, NETIF_F_GSO_MASK);
- }
+ tcp_v4_md5_syn_recv_sock(sk, newsk);
#endif
if (__inet_inherit_port(sk, newsk) < 0)
@@ -1930,14 +1491,6 @@ const struct inet_connection_sock_af_ops ipv4_specific = {
};
EXPORT_SYMBOL(ipv4_specific);
-#ifdef CONFIG_TCP_MD5SIG
-static 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,
-};
-#endif
-
/* NOTE: A lot of things set to zero explicitly by call to
* sk_alloc() so need not be done here.
*/
@@ -1980,12 +1533,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
if (unlikely(!hlist_empty(&tp->tcp_option_list)))
tcp_extopt_destroy(sk);
#ifdef CONFIG_TCP_MD5SIG
- /* 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;
- }
+ tcp_v4_md5_destroy_sock(sk);
#endif
/* Clean up a referenced TCP bind bucket. */
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 @@
+#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
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index aa2ff9aadad0..f33214b29167 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -22,6 +22,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
+#include <linux/tcp_md5.h>
#include <linux/workqueue.h>
#include <linux/static_key.h>
#include <net/tcp.h>
@@ -295,21 +296,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
INIT_HLIST_HEAD(&tp->tcp_option_list);
}
#ifdef CONFIG_TCP_MD5SIG
- /*
- * 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.
- */
- do {
- struct tcp_md5sig_key *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());
- }
- } while (0);
+ tcp_md5_time_wait(sk, tw);
#endif
/* Get the TIME_WAIT timeout firing. */
@@ -346,13 +333,10 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
void tcp_twsk_destructor(struct sock *sk)
{
#ifdef CONFIG_TCP_MD5SIG
- struct tcp_timewait_sock *twsk = tcp_twsk(sk);
-
- if (twsk->tw_md5_key)
- kfree_rcu(twsk->tw_md5_key, rcu);
+ tcp_md5_twsk_destructor(sk);
#endif
- if (unlikely(!hlist_empty(&twsk->tcp_option_list)))
+ if (unlikely(!hlist_empty(&tcp_twsk(sk)->tcp_option_list)))
tcp_extopt_destroy(sk);
}
EXPORT_SYMBOL_GPL(tcp_twsk_destructor);
@@ -538,8 +522,7 @@ struct sock *tcp_create_openreq_child(const struct sock *sk,
newtp->tsoffset = treq->ts_off;
#ifdef CONFIG_TCP_MD5SIG
newtp->md5sig_info = NULL; /*XXX*/
- if (newtp->af_specific->md5_lookup(sk, newsk))
- newtp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED;
+ tcp_md5_add_header_len(sk, newsk);
#endif
if (unlikely(!hlist_empty(&treq->tcp_option_list)))
newtp->tcp_header_len += tcp_extopt_add_header(req_to_sk(req), newsk);
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 7ea65f70e5ec..137645753abb 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -42,6 +42,7 @@
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/static_key.h>
+#include <linux/tcp_md5.h>
#include <trace/events/tcp.h>
@@ -3238,8 +3239,7 @@ static void tcp_connect_init(struct sock *sk)
tp->tcp_header_len += TCPOLEN_TSTAMP_ALIGNED;
#ifdef CONFIG_TCP_MD5SIG
- if (tp->af_specific->md5_lookup(sk, sk))
- tp->tcp_header_len += TCPOLEN_MD5SIG_ALIGNED;
+ tcp_md5_add_header_len(sk, sk);
#endif
if (unlikely(!hlist_empty(&tp->tcp_option_list)))
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 202a59511950..e9b72d794140 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -43,6 +43,7 @@
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/random.h>
+#include <linux/tcp_md5.h>
#include <net/tcp.h>
#include <net/ndisc.h>
@@ -79,10 +80,6 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
static const struct inet_connection_sock_af_ops ipv6_mapped;
static const struct inet_connection_sock_af_ops ipv6_specific;
-#ifdef CONFIG_TCP_MD5SIG
-static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
-static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
-#endif
static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
{
@@ -501,218 +498,6 @@ static void tcp_v6_reqsk_destructor(struct request_sock *req)
kfree_skb(inet_rsk(req)->pktopts);
}
-#ifdef CONFIG_TCP_MD5SIG
-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);
-}
-
-static 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);
-}
-
-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);
-}
-
-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);
-}
-
-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;
-}
-
-static 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;
-}
-
-#endif
-
-static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
- const struct sk_buff *skb)
-{
-#ifdef CONFIG_TCP_MD5SIG
- 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;
- }
-#endif
- return false;
-}
-
static void tcp_v6_init_req(struct request_sock *req,
const struct sock *sk_listener,
struct sk_buff *skb)
@@ -787,56 +572,24 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
__be32 *topt;
struct hlist_head *extopt_list = NULL;
struct tcp_out_options extraopts;
-#ifdef CONFIG_TCP_MD5SIG
- struct tcp_md5sig_key *key = NULL;
- const __u8 *hash_location = NULL;
- struct ipv6hdr *ipv6h = ipv6_hdr(skb);
-#endif
+
+ memset(&extraopts, 0, sizeof(extraopts));
if (tsecr)
tot_len += TCPOLEN_TSTAMP_ALIGNED;
#ifdef CONFIG_TCP_MD5SIG
- rcu_read_lock();
- hash_location = tcp_parse_md5sig_option(th);
- if (sk && sk_fullsock(sk)) {
- key = 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);
-
- key = tcp_twsk_md5_key(tcptw);
- } else if (sk && sk->sk_state == TCP_NEW_SYN_RECV) {
- key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
- } else if (hash_location) {
- unsigned char newhash[16];
- struct sock *sk1 = NULL;
- 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;
+{
+ int ret;
- key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
- if (!key)
- goto out;
+ ret = tcp_v6_md5_send_response_prepare(skb, 0,
+ MAX_TCP_OPTION_SPACE - tot_len,
+ &extraopts, sk);
- genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
- if (genhash || memcmp(hash_location, newhash, 16) != 0)
- goto out;
- }
+ if (ret == -1)
+ goto out;
- if (key)
- tot_len += TCPOLEN_MD5SIG_ALIGNED;
+ tot_len += ret;
+}
#endif
if (sk)
@@ -850,8 +603,6 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
if (!rst || !th->ack)
extraflags |= TCPHDR_ACK;
- memset(&extraopts, 0, sizeof(extraopts));
-
used = tcp_extopt_response_prepare(skb, extraflags, remaining,
&extraopts, sk);
@@ -889,13 +640,8 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
}
#ifdef CONFIG_TCP_MD5SIG
- if (key) {
- *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
- (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
- tcp_v6_md5_hash_hdr((__u8 *)topt, key,
- &ipv6_hdr(skb)->saddr,
- &ipv6_hdr(skb)->daddr, t1);
- }
+ if (extraopts.md5)
+ tcp_v6_md5_send_response_write(topt, skb, t1, &extraopts, sk);
#endif
if (unlikely(extopt_list && !hlist_empty(extopt_list)))
@@ -943,10 +689,6 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
out:
kfree_skb(buff);
-
-#ifdef CONFIG_TCP_MD5SIG
- rcu_read_unlock();
-#endif
}
static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
@@ -1072,9 +814,6 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
struct inet_sock *newinet;
struct tcp_sock *newtp;
struct sock *newsk;
-#ifdef CONFIG_TCP_MD5SIG
- struct tcp_md5sig_key *key;
-#endif
struct flowi6 fl6;
if (skb->protocol == htons(ETH_P_IP)) {
@@ -1219,18 +958,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
#ifdef CONFIG_TCP_MD5SIG
- /* Copy over the MD5 key from the original socket */
- key = tcp_v6_md5_do_lookup(sk, &newsk->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(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
- AF_INET6, 128, key->key, key->keylen,
- sk_gfp_mask(sk, GFP_ATOMIC));
- }
+ tcp_v6_md5_syn_recv_sock(sk, newsk);
#endif
if (__inet_inherit_port(sk, newsk) < 0) {
@@ -1692,14 +1420,6 @@ static const struct inet_connection_sock_af_ops ipv6_specific = {
.mtu_reduced = tcp_v6_mtu_reduced,
};
-#ifdef CONFIG_TCP_MD5SIG
-static 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,
-};
-#endif
-
/*
* TCP over IPv4 via INET6 API
*/
@@ -1722,14 +1442,6 @@ static const struct inet_connection_sock_af_ops ipv6_mapped = {
.mtu_reduced = tcp_v4_mtu_reduced,
};
-#ifdef CONFIG_TCP_MD5SIG
-static 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,
-};
-#endif
-
/* NOTE: A lot of things set to zero explicitly by call to
* sk_alloc() so need not be done here.
*/
--
2.15.0
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