On Mon, Sep 5, 2022 at 12:06 AM Leonard Crestez cdleonard@gmail.com wrote:
This commit adds support to add and remove keys but does not use them further.
Similar to tcp md5 a single pointer to a struct tcp_authopt_info* struct is added to struct tcp_sock, this avoids increasing memory usage. The data structures related to tcp_authopt are initialized on setsockopt and only freed on socket close.
Thanks Leonard.
Small points from my side, please find them attached.
Signed-off-by: Leonard Crestez cdleonard@gmail.com
include/linux/tcp.h | 9 + include/net/net_namespace.h | 4 + include/net/netns/tcp_authopt.h | 12 ++ include/net/tcp.h | 1 + include/net/tcp_authopt.h | 70 +++++++ include/uapi/linux/tcp.h | 81 ++++++++ net/ipv4/Kconfig | 14 ++ net/ipv4/Makefile | 1 + net/ipv4/tcp.c | 32 ++++ net/ipv4/tcp_authopt.c | 317 ++++++++++++++++++++++++++++++++ net/ipv4/tcp_ipv4.c | 2 + 11 files changed, 543 insertions(+) create mode 100644 include/net/netns/tcp_authopt.h create mode 100644 include/net/tcp_authopt.h create mode 100644 net/ipv4/tcp_authopt.c
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index a9fbe22732c3..551942883f06 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -170,10 +170,12 @@ struct tcp_request_sock { static inline struct tcp_request_sock *tcp_rsk(const struct request_sock *req) { return (struct tcp_request_sock *)req; }
+struct tcp_authopt_info;
struct tcp_sock { /* inet_connection_sock has to be the first member of tcp_sock */ struct inet_connection_sock inet_conn; u16 tcp_header_len; /* Bytes of tcp header to send */ u16 gso_segs; /* Max number of segs per GSO packet */ @@ -434,10 +436,14 @@ struct tcp_sock {
/* TCP MD5 Signature Option information */ struct tcp_md5sig_info __rcu *md5sig_info; #endif
+#ifdef CONFIG_TCP_AUTHOPT
struct tcp_authopt_info __rcu *authopt_info;+#endif
/* TCP fastopen related information */ struct tcp_fastopen_request *fastopen_req; /* fastopen_rsk points to request_sock that resulted in this big * socket. Used to retransmit SYNACKs etc. */ @@ -484,10 +490,13 @@ struct tcp_timewait_sock { int tw_ts_recent_stamp; u32 tw_tx_delay; #ifdef CONFIG_TCP_MD5SIG struct tcp_md5sig_key *tw_md5_key; #endif +#ifdef CONFIG_TCP_AUTHOPT
struct tcp_authopt_info *tw_authopt_info;+#endif };
static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk) { return (struct tcp_timewait_sock *)sk; diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h index 8c3587d5c308..30964366951d 100644 --- a/include/net/net_namespace.h +++ b/include/net/net_namespace.h @@ -35,10 +35,11 @@ #include <net/netns/can.h> #include <net/netns/xdp.h> #include <net/netns/smc.h> #include <net/netns/bpf.h> #include <net/netns/mctp.h> +#include <net/netns/tcp_authopt.h> #include <net/net_trackers.h> #include <linux/ns_common.h> #include <linux/idr.h> #include <linux/skbuff.h> #include <linux/notifier.h> @@ -184,10 +185,13 @@ struct net { #endif struct sock *diag_nlsk; #if IS_ENABLED(CONFIG_SMC) struct netns_smc smc; #endif +#if IS_ENABLED(CONFIG_TCP_AUTHOPT)
struct netns_tcp_authopt tcp_authopt;+#endif } __randomize_layout;
#include <linux/seq_file_net.h>
/* Init's network namespace */ diff --git a/include/net/netns/tcp_authopt.h b/include/net/netns/tcp_authopt.h new file mode 100644 index 000000000000..03b7f4e58448 --- /dev/null +++ b/include/net/netns/tcp_authopt.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __NETNS_TCP_AUTHOPT_H__ +#define __NETNS_TCP_AUTHOPT_H__
+#include <linux/mutex.h>
+struct netns_tcp_authopt {
struct hlist_head head;struct mutex mutex;+};
+#endif /* __NETNS_TCP_AUTHOPT_H__ */ diff --git a/include/net/tcp.h b/include/net/tcp.h index d10962b9f0d0..9955a88faf9b 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -184,10 +184,11 @@ void tcp_time_wait(struct sock *sk, int state, int timeo); #define TCPOPT_WINDOW 3 /* Window scaling */ #define TCPOPT_SACK_PERM 4 /* SACK Permitted */ #define TCPOPT_SACK 5 /* SACK Block */ #define TCPOPT_TIMESTAMP 8 /* Better RTT estimations/PAWS */ #define TCPOPT_MD5SIG 19 /* MD5 Signature (RFC2385) */ +#define TCPOPT_AUTHOPT 29 /* Auth Option (RFC5925) */ #define TCPOPT_MPTCP 30 /* Multipath TCP (RFC6824) */ #define TCPOPT_FASTOPEN 34 /* Fast open (RFC7413) */ #define TCPOPT_EXP 254 /* Experimental */ /* Magic number to be after the option value for sharing TCP
- experimental options. See draft-ietf-tcpm-experimental-options-00.txt
diff --git a/include/net/tcp_authopt.h b/include/net/tcp_authopt.h new file mode 100644 index 000000000000..bc2cff82830d --- /dev/null +++ b/include/net/tcp_authopt.h @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef _LINUX_TCP_AUTHOPT_H +#define _LINUX_TCP_AUTHOPT_H
+#include <uapi/linux/tcp.h> +#include <net/netns/tcp_authopt.h> +#include <linux/tcp.h>
+/**
- struct tcp_authopt_key_info - Representation of a Master Key Tuple as per RFC5925
- Key structure lifetime is protected by RCU so send/recv code needs to hold a
- single rcu_read_lock until they're done with the key.
- Global keys can be cached in sockets, this requires increasing kref.
- */
+struct tcp_authopt_key_info {
/** @node: node in &netns_tcp_authopt.head list */struct hlist_node node;/** @rcu: for kfree_rcu */struct rcu_head rcu;/** @ref: for kref_put */struct kref ref;/** @flags: Combination of &enum tcp_authopt_key_flag */u32 flags;/** @send_id: Same as &tcp_authopt_key.send_id */u8 send_id;/** @recv_id: Same as &tcp_authopt_key.recv_id */u8 recv_id;/** @alg_id: Same as &tcp_authopt_key.alg */u8 alg_id;/** @keylen: Same as &tcp_authopt_key.keylen */u8 keylen;/** @key: Same as &tcp_authopt_key.key */u8 key[TCP_AUTHOPT_MAXKEYLEN];/** @addr: Same as &tcp_authopt_key.addr */struct sockaddr_storage addr;+};
+/**
- struct tcp_authopt_info - Per-socket information regarding tcp_authopt
- This is lazy-initialized in order to avoid increasing memory usage for
- regular TCP sockets. Once created it is only destroyed on socket close.
- */
+struct tcp_authopt_info {
/** @rcu: for kfree_rcu */struct rcu_head rcu;/** @flags: Combination of &enum tcp_authopt_flag */u32 flags;/** @src_isn: Local Initial Sequence Number */u32 src_isn;/** @dst_isn: Remote Initial Sequence Number */u32 dst_isn;+};
+#ifdef CONFIG_TCP_AUTHOPT +DECLARE_STATIC_KEY_FALSE(tcp_authopt_needed_key); +#define tcp_authopt_needed (static_branch_unlikely(&tcp_authopt_needed_key)) +void tcp_authopt_clear(struct sock *sk); +int tcp_set_authopt(struct sock *sk, sockptr_t optval, unsigned int optlen); +int tcp_get_authopt_val(struct sock *sk, struct tcp_authopt *key); +int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen); +#else +static inline void tcp_authopt_clear(struct sock *sk) +{ +} +#endif
+#endif /* _LINUX_TCP_AUTHOPT_H */ diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 8fc09e8638b3..76d7be6b27f4 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -126,10 +126,12 @@ enum { #define TCP_INQ 36 /* Notify bytes available to read as a cmsg on read */
#define TCP_CM_INQ TCP_INQ
#define TCP_TX_DELAY 37 /* delay outgoing packets by XX usec */ +#define TCP_AUTHOPT 38 /* TCP Authentication Option (RFC5925) */ +#define TCP_AUTHOPT_KEY 39 /* TCP Authentication Option Key (RFC5925) */
#define TCP_REPAIR_ON 1 #define TCP_REPAIR_OFF 0 #define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */ @@ -340,10 +342,89 @@ struct tcp_diag_md5sig { __u16 tcpm_keylen; __be32 tcpm_addr[4]; __u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; };
+/**
- enum tcp_authopt_flag - flags for `tcp_authopt.flags`
- */
+enum tcp_authopt_flag {
/*** @TCP_AUTHOPT_FLAG_REJECT_UNEXPECTED:* Configure behavior of segments with TCP-AO coming from hosts for which no* key is configured. The default recommended by RFC is to silently accept* such connections.*/TCP_AUTHOPT_FLAG_REJECT_UNEXPECTED = (1 << 2),+};
+/**
- struct tcp_authopt - Per-socket options related to TCP Authentication Option
- */
+struct tcp_authopt {
/** @flags: Combination of &enum tcp_authopt_flag */__u32 flags;+};
+/**
- enum tcp_authopt_key_flag - flags for `tcp_authopt.flags`
- @TCP_AUTHOPT_KEY_DEL: Delete the key and ignore non-id fields
- @TCP_AUTHOPT_KEY_EXCLUDE_OPTS: Exclude TCP options from signature
- @TCP_AUTHOPT_KEY_ADDR_BIND: Key only valid for `tcp_authopt.addr`
- */
+enum tcp_authopt_key_flag {
TCP_AUTHOPT_KEY_DEL = (1 << 0),TCP_AUTHOPT_KEY_EXCLUDE_OPTS = (1 << 1),TCP_AUTHOPT_KEY_ADDR_BIND = (1 << 2),+};
+/**
- enum tcp_authopt_alg - Algorithms for TCP Authentication Option
- */
+enum tcp_authopt_alg {
/** @TCP_AUTHOPT_ALG_HMAC_SHA_1_96: HMAC-SHA-1-96 as described in RFC5926 */TCP_AUTHOPT_ALG_HMAC_SHA_1_96 = 1,/** @TCP_AUTHOPT_ALG_AES_128_CMAC_96: AES-128-CMAC-96 as described in RFC5926 */TCP_AUTHOPT_ALG_AES_128_CMAC_96 = 2,+};
+/* for TCP_AUTHOPT_KEY socket option */ +#define TCP_AUTHOPT_MAXKEYLEN 80
+/**
- struct tcp_authopt_key - TCP Authentication KEY
- Key are identified by the combination of:
- send_id
- recv_id
- addr (iff TCP_AUTHOPT_KEY_ADDR_BIND)
- RFC5925 requires that key ids must not overlap for the same TCP connection.
- This is not enforced by linux.
- */
+struct tcp_authopt_key {
/** @flags: Combination of &enum tcp_authopt_key_flag */__u32 flags;/** @send_id: keyid value for send */__u8 send_id;/** @recv_id: keyid value for receive */__u8 recv_id;/** @alg: One of &enum tcp_authopt_alg */__u8 alg;/** @keylen: Length of the key buffer */__u8 keylen;/** @key: Secret key */__u8 key[TCP_AUTHOPT_MAXKEYLEN];/*** @addr: Key is only valid for this address** Ignored unless TCP_AUTHOPT_KEY_ADDR_BIND flag is set*/struct __kernel_sockaddr_storage addr;+};
/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1 struct tcp_zerocopy_receive { __u64 address; /* in: address of mapping */ diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig index e983bb0c5012..75f7e3c75ea6 100644 --- a/net/ipv4/Kconfig +++ b/net/ipv4/Kconfig @@ -739,5 +739,19 @@ config TCP_MD5SIG RFC2385 specifies a method of giving MD5 protection to TCP sessions. Its main (only?) use is to protect BGP sessions between core routers on the Internet.
If unsure, say N.
+config TCP_AUTHOPT
bool "TCP: Authentication Option support (RFC5925)"select CRYPTOselect CRYPTO_SHA1select CRYPTO_HMACselect CRYPTO_AESselect CRYPTO_CMAChelpRFC5925 specifies a new method of giving protection to TCP sessions.Its intended use is to protect BGP sessions between core routerson the Internet. It obsoletes TCP MD5 (RFC2385) but is incompatible.If unsure, say N.diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile index bbdd9c44f14e..d336f32ce177 100644 --- a/net/ipv4/Makefile +++ b/net/ipv4/Makefile @@ -59,10 +59,11 @@ obj-$(CONFIG_TCP_CONG_NV) += tcp_nv.o obj-$(CONFIG_TCP_CONG_VENO) += tcp_veno.o obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o +obj-$(CONFIG_TCP_AUTHOPT) += tcp_authopt.o obj-$(CONFIG_NET_SOCK_MSG) += tcp_bpf.o obj-$(CONFIG_BPF_SYSCALL) += udp_bpf.o obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \ diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 306b94dedc8d..6a0357cf05b5 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -270,10 +270,11 @@
#include <net/icmp.h> #include <net/inet_common.h> #include <net/tcp.h> #include <net/mptcp.h> +#include <net/tcp_authopt.h> #include <net/xfrm.h> #include <net/ip.h> #include <net/sock.h>
#include <linux/uaccess.h> @@ -3703,10 +3704,18 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname, #ifdef CONFIG_TCP_MD5SIG case TCP_MD5SIG: case TCP_MD5SIG_EXT: err = tp->af_specific->md5_parse(sk, optname, optval, optlen); break; +#endif +#ifdef CONFIG_TCP_AUTHOPT
case TCP_AUTHOPT:err = tcp_set_authopt(sk, optval, optlen);break;case TCP_AUTHOPT_KEY:err = tcp_set_authopt_key(sk, optval, optlen);break;#endif case TCP_USER_TIMEOUT: /* Cap the max time in ms TCP will retry or probe the window * before giving up and aborting (ETIMEDOUT) a connection. */ @@ -4354,10 +4363,33 @@ static int do_tcp_getsockopt(struct sock *sk, int level, if (!err && copy_to_user(optval, &zc, len)) err = -EFAULT; return err; } #endif +#ifdef CONFIG_TCP_AUTHOPT
case TCP_AUTHOPT: {struct tcp_authopt info;int err;if (get_user(len, optlen))return -EFAULT;lock_sock(sk);err = tcp_get_authopt_val(sk, &info);release_sock(sk);if (err)return err;len = min_t(unsigned int, len, sizeof(info));if (put_user(len, optlen))return -EFAULT;if (copy_to_user(optval, &info, len))return -EFAULT;return 0;}+#endif
default: return -ENOPROTOOPT; } if (put_user(len, optlen))diff --git a/net/ipv4/tcp_authopt.c b/net/ipv4/tcp_authopt.c new file mode 100644 index 000000000000..d38e9c89c89d --- /dev/null +++ b/net/ipv4/tcp_authopt.c @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0-or-later
+#include <net/tcp_authopt.h> +#include <net/ipv6.h> +#include <net/tcp.h> +#include <linux/kref.h>
+/* This is enabled when first struct tcp_authopt_info is allocated and never released */ +DEFINE_STATIC_KEY_FALSE(tcp_authopt_needed_key); +EXPORT_SYMBOL(tcp_authopt_needed_key);
+static inline struct netns_tcp_authopt *sock_net_tcp_authopt(const struct sock *sk) +{
return &sock_net(sk)->tcp_authopt;+}
+static void tcp_authopt_key_release_kref(struct kref *ref) +{
struct tcp_authopt_key_info *key = container_of(ref, struct tcp_authopt_key_info, ref);kfree_rcu(key, rcu);+}
+static void tcp_authopt_key_put(struct tcp_authopt_key_info *key) +{
if (key)kref_put(&key->ref, tcp_authopt_key_release_kref);+}
+static void tcp_authopt_key_del(struct netns_tcp_authopt *net,
struct tcp_authopt_key_info *key)+{
lockdep_assert_held(&net->mutex);hlist_del_rcu(&key->node);key->flags |= TCP_AUTHOPT_KEY_DEL;kref_put(&key->ref, tcp_authopt_key_release_kref);+}
+/* Free info and keys.
- Don't touch tp->authopt_info, it might not even be assigned yes.
- */
+void tcp_authopt_free(struct sock *sk, struct tcp_authopt_info *info) +{
kfree_rcu(info, rcu);+}
+/* Free everything and clear tcp_sock.authopt_info to NULL */ +void tcp_authopt_clear(struct sock *sk) +{
struct tcp_authopt_info *info;info = rcu_dereference_protected(tcp_sk(sk)->authopt_info, lockdep_sock_is_held(sk));if (info) {tcp_authopt_free(sk, info);tcp_sk(sk)->authopt_info = NULL;
RCU rules at deletion mandate that the pointer must be cleared before the call_rcu()/kfree_rcu() call.
It is possible that current MD5 code has an issue here, let's not copy/paste it.
}+}
+/* checks that ipv4 or ipv6 addr matches. */ +static bool ipvx_addr_match(struct sockaddr_storage *a1,
struct sockaddr_storage *a2)+{
if (a1->ss_family != a2->ss_family)return false;if (a1->ss_family == AF_INET &&(((struct sockaddr_in *)a1)->sin_addr.s_addr !=((struct sockaddr_in *)a2)->sin_addr.s_addr))return false;if (a1->ss_family == AF_INET6 &&!ipv6_addr_equal(&((struct sockaddr_in6 *)a1)->sin6_addr,&((struct sockaddr_in6 *)a2)->sin6_addr))return false;return true;+}
Always surprising to see this kind of generic helper being added in a patch.
+static bool tcp_authopt_key_match_exact(struct tcp_authopt_key_info *info,
struct tcp_authopt_key *key)+{
if (info->send_id != key->send_id)return false;if (info->recv_id != key->recv_id)return false;if ((info->flags & TCP_AUTHOPT_KEY_ADDR_BIND) != (key->flags & TCP_AUTHOPT_KEY_ADDR_BIND))return false;if (info->flags & TCP_AUTHOPT_KEY_ADDR_BIND)if (!ipvx_addr_match(&info->addr, &key->addr))return false;return true;+}
+static struct tcp_authopt_key_info *tcp_authopt_key_lookup_exact(const struct sock *sk,
struct netns_tcp_authopt *net,struct tcp_authopt_key *ukey)+{
struct tcp_authopt_key_info *key_info;hlist_for_each_entry_rcu(key_info, &net->head, node, lockdep_is_held(&net->mutex))if (tcp_authopt_key_match_exact(key_info, ukey))return key_info;return NULL;+}
+static struct tcp_authopt_info *__tcp_authopt_info_get_or_create(struct sock *sk) +{
struct tcp_sock *tp = tcp_sk(sk);struct tcp_authopt_info *info;info = rcu_dereference_check(tp->authopt_info, lockdep_sock_is_held(sk));if (info)return info;info = kzalloc(sizeof(*info), GFP_KERNEL);if (!info)return ERR_PTR(-ENOMEM);/* Never released: */static_branch_inc(&tcp_authopt_needed_key);sk_gso_disable(sk);rcu_assign_pointer(tp->authopt_info, info);return info;+}
+#define TCP_AUTHOPT_KNOWN_FLAGS ( \
TCP_AUTHOPT_FLAG_REJECT_UNEXPECTED)+/* Like copy_from_sockptr except tolerate different optlen for compatibility reasons
- If the src is shorter then it's from an old userspace and the rest of dst is
- filled with zeros.
- If the dst is shorter then src is from a newer userspace and we only accept
- if the rest of the option is all zeros.
- This allows sockopts to grow as long as for new fields zeros has no effect.
- */
+static int _copy_from_sockptr_tolerant(u8 *dst,
unsigned int dstlen,sockptr_t src,unsigned int srclen)+{
int err;/* If userspace optlen is too short fill the rest with zeros */if (srclen > dstlen) {if (sockptr_is_kernel(src))return -EINVAL;err = check_zeroed_user(src.user + dstlen, srclen - dstlen);if (err < 0)return err;if (err == 0)return -EINVAL;}err = copy_from_sockptr(dst, src, min(srclen, dstlen));if (err)return err;if (srclen < dstlen)memset(dst + srclen, 0, dstlen - srclen);return err;+}
+int tcp_set_authopt(struct sock *sk, sockptr_t optval, unsigned int optlen) +{
struct tcp_authopt opt;struct tcp_authopt_info *info;int err;sock_owned_by_me(sk);err = _copy_from_sockptr_tolerant((u8 *)&opt, sizeof(opt), optval, optlen);if (err)return err;if (opt.flags & ~TCP_AUTHOPT_KNOWN_FLAGS)return -EINVAL;info = __tcp_authopt_info_get_or_create(sk);if (IS_ERR(info))return PTR_ERR(info);info->flags = opt.flags & TCP_AUTHOPT_KNOWN_FLAGS;return 0;+}
+int tcp_get_authopt_val(struct sock *sk, struct tcp_authopt *opt) +{
struct tcp_sock *tp = tcp_sk(sk);struct tcp_authopt_info *info;memset(opt, 0, sizeof(*opt));sock_owned_by_me(sk);info = rcu_dereference_check(tp->authopt_info, lockdep_sock_is_held(sk));
Probably not a big deal, but it seems the prior sock_owned_by_me() might be redundant.
if (!info)return -ENOENT;opt->flags = info->flags & TCP_AUTHOPT_KNOWN_FLAGS;return 0;+}
+#define TCP_AUTHOPT_KEY_KNOWN_FLAGS ( \
TCP_AUTHOPT_KEY_DEL | \TCP_AUTHOPT_KEY_EXCLUDE_OPTS | \TCP_AUTHOPT_KEY_ADDR_BIND)+int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen) +{
struct tcp_authopt_key opt;struct tcp_authopt_info *info;struct tcp_authopt_key_info *key_info, *old_key_info;struct netns_tcp_authopt *net = sock_net_tcp_authopt(sk);int err;sock_owned_by_me(sk);if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))return -EPERM;err = _copy_from_sockptr_tolerant((u8 *)&opt, sizeof(opt), optval, optlen);if (err)return err;if (opt.flags & ~TCP_AUTHOPT_KEY_KNOWN_FLAGS)return -EINVAL;if (opt.keylen > TCP_AUTHOPT_MAXKEYLEN)return -EINVAL;/* Delete is a special case: */if (opt.flags & TCP_AUTHOPT_KEY_DEL) {mutex_lock(&net->mutex);key_info = tcp_authopt_key_lookup_exact(sk, net, &opt);if (key_info) {tcp_authopt_key_del(net, key_info);err = 0;} else {err = -ENOENT;}mutex_unlock(&net->mutex);return err;}/* check key family */if (opt.flags & TCP_AUTHOPT_KEY_ADDR_BIND) {if (sk->sk_family != opt.addr.ss_family)return -EINVAL;}/* Initialize tcp_authopt_info if not already set */info = __tcp_authopt_info_get_or_create(sk);if (IS_ERR(info))return PTR_ERR(info);key_info = kmalloc(sizeof(*key_info), GFP_KERNEL | __GFP_ZERO);
kzalloc() ?
if (!key_info)return -ENOMEM;mutex_lock(&net->mutex);kref_init(&key_info->ref);/* If an old key exists with exact ID then remove and replace.* RCU-protected readers might observe both and pick any.*/old_key_info = tcp_authopt_key_lookup_exact(sk, net, &opt);if (old_key_info)tcp_authopt_key_del(net, old_key_info);key_info->flags = opt.flags & TCP_AUTHOPT_KEY_KNOWN_FLAGS;key_info->send_id = opt.send_id;key_info->recv_id = opt.recv_id;key_info->alg_id = opt.alg;key_info->keylen = opt.keylen;memcpy(key_info->key, opt.key, opt.keylen);memcpy(&key_info->addr, &opt.addr, sizeof(key_info->addr));hlist_add_head_rcu(&key_info->node, &net->head);mutex_unlock(&net->mutex);return 0;+}
+static int tcp_authopt_init_net(struct net *full_net)
Hmmm... our convention is to use "struct net *net"
+{
struct netns_tcp_authopt *net = &full_net->tcp_authopt;
Here, you should use a different name ...
mutex_init(&net->mutex);INIT_HLIST_HEAD(&net->head);return 0;+}
+static void tcp_authopt_exit_net(struct net *full_net) +{
struct netns_tcp_authopt *net = &full_net->tcp_authopt;struct tcp_authopt_key_info *key;struct hlist_node *n;
Same remark here. Please reserve @net for a "struct net" pointer.
mutex_lock(&net->mutex);hlist_for_each_entry_safe(key, n, &net->head, node) {hlist_del_rcu(&key->node);tcp_authopt_key_put(key);}mutex_unlock(&net->mutex);+}
+static struct pernet_operations net_ops = {
.init = tcp_authopt_init_net,.exit = tcp_authopt_exit_net,+};
+static int __init tcp_authopt_init(void) +{
return register_pernet_subsys(&net_ops);+} +late_initcall(tcp_authopt_init); diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 01b31f5c7aba..f6d1dba31ca4 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -60,10 +60,11 @@
#include <net/net_namespace.h> #include <net/icmp.h> #include <net/inet_hashtables.h> #include <net/tcp.h> +#include <net/tcp_authopt.h> #include <net/transp_v6.h> #include <net/ipv6.h> #include <net/inet_common.h> #include <net/timewait_sock.h> #include <net/xfrm.h> @@ -2267,10 +2268,11 @@ void tcp_v4_destroy_sock(struct sock *sk) tcp_clear_md5_list(sk); kfree_rcu(rcu_dereference_protected(tp->md5sig_info, 1), rcu); tp->md5sig_info = NULL; } #endif
tcp_authopt_clear(sk);
Do we really own the socket lock at this point ?
/* Clean up a referenced TCP bind bucket. */ if (inet_csk(sk)->icsk_bind_hash) inet_put_port(sk);-- 2.25.1