From 02d223a2ba965bb145a7b010d1749a4f8ef695db Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 16 May 2010 00:34:04 -0700 Subject: [PATCH] tcp: fix MD5 (RFC2385) support TCP MD5 support uses percpu data for temporary storage. It currently disables preemption so that same storage cannot be reclaimed by another thread on same cpu. We also have to make sure a softirq handler wont try to use also same context. Various bug reports demonstrated corruptions. Fix is to disable preemption and BH. Reported-by: Bhaskar Dutta Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- include/net/tcp.h | 21 +++------------------ net/ipv4/tcp.c | 34 ++++++++++++++++++++++++---------- 2 files changed, 27 insertions(+), 28 deletions(-) diff --git a/include/net/tcp.h b/include/net/tcp.h index 75be5a28815d5..aa04b9a5093b2 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1197,30 +1197,15 @@ extern int tcp_v4_md5_do_del(struct sock *sk, extern struct tcp_md5sig_pool * __percpu *tcp_alloc_md5sig_pool(struct sock *); extern void tcp_free_md5sig_pool(void); -extern struct tcp_md5sig_pool *__tcp_get_md5sig_pool(int cpu); -extern void __tcp_put_md5sig_pool(void); +extern struct tcp_md5sig_pool *tcp_get_md5sig_pool(void); +extern void tcp_put_md5sig_pool(void); + extern int tcp_md5_hash_header(struct tcp_md5sig_pool *, struct tcphdr *); extern int tcp_md5_hash_skb_data(struct tcp_md5sig_pool *, struct sk_buff *, unsigned header_len); extern int tcp_md5_hash_key(struct tcp_md5sig_pool *hp, struct tcp_md5sig_key *key); -static inline -struct tcp_md5sig_pool *tcp_get_md5sig_pool(void) -{ - int cpu = get_cpu(); - struct tcp_md5sig_pool *ret = __tcp_get_md5sig_pool(cpu); - if (!ret) - put_cpu(); - return ret; -} - -static inline void tcp_put_md5sig_pool(void) -{ - __tcp_put_md5sig_pool(); - put_cpu(); -} - /* write queue abstraction */ static inline void tcp_write_queue_purge(struct sock *sk) { diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 0f8caf64caa3a..296150b2a62f1 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2839,7 +2839,6 @@ static void __tcp_free_md5sig_pool(struct tcp_md5sig_pool * __percpu *pool) if (p->md5_desc.tfm) crypto_free_hash(p->md5_desc.tfm); kfree(p); - p = NULL; } } free_percpu(pool); @@ -2937,25 +2936,40 @@ retry: EXPORT_SYMBOL(tcp_alloc_md5sig_pool); -struct tcp_md5sig_pool *__tcp_get_md5sig_pool(int cpu) + +/** + * 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) { struct tcp_md5sig_pool * __percpu *p; - spin_lock_bh(&tcp_md5sig_pool_lock); + + local_bh_disable(); + + spin_lock(&tcp_md5sig_pool_lock); p = tcp_md5sig_pool; if (p) tcp_md5sig_users++; - spin_unlock_bh(&tcp_md5sig_pool_lock); - return (p ? *per_cpu_ptr(p, cpu) : NULL); -} + spin_unlock(&tcp_md5sig_pool_lock); + + if (p) + return *per_cpu_ptr(p, smp_processor_id()); -EXPORT_SYMBOL(__tcp_get_md5sig_pool); + local_bh_enable(); + return NULL; +} +EXPORT_SYMBOL(tcp_get_md5sig_pool); -void __tcp_put_md5sig_pool(void) +void tcp_put_md5sig_pool(void) { + local_bh_enable(); tcp_free_md5sig_pool(); } - -EXPORT_SYMBOL(__tcp_put_md5sig_pool); +EXPORT_SYMBOL(tcp_put_md5sig_pool); int tcp_md5_hash_header(struct tcp_md5sig_pool *hp, struct tcphdr *th) -- 2.39.5