diff options
| -rw-r--r-- | include/net/tcp.h | 12 | ||||
| -rw-r--r-- | net/ipv4/tcp_ipv4.c | 19 | ||||
| -rw-r--r-- | net/ipv4/tcp_output.c | 5 | ||||
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 7 |
4 files changed, 30 insertions, 13 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index a4201ef216e8..4dc6641ee990 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -696,12 +696,6 @@ static inline u32 tcp_skb_timestamp(const struct sk_buff *skb) * If this grows please adjust skbuff.h:skbuff->cb[xxx] size appropriately. */ struct tcp_skb_cb { - union { - struct inet_skb_parm h4; -#if IS_ENABLED(CONFIG_IPV6) - struct inet6_skb_parm h6; -#endif - } header; /* For incoming frames */ __u32 seq; /* Starting sequence number */ __u32 end_seq; /* SEQ + FIN + SYN + datalen */ __u32 tcp_tw_isn; /* isn chosen by tcp_timewait_state_process() */ @@ -720,6 +714,12 @@ struct tcp_skb_cb { __u8 ip_dsfield; /* IPv4 tos or IPv6 dsfield */ /* 1 byte hole */ __u32 ack_seq; /* Sequence number ACK'd */ + union { + struct inet_skb_parm h4; +#if IS_ENABLED(CONFIG_IPV6) + struct inet6_skb_parm h6; +#endif + } header; /* For incoming frames */ }; #define TCP_SKB_CB(__skb) ((struct tcp_skb_cb *)&((__skb)->cb[0])) diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c index 28ab90382c01..9ce3eac02957 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -886,18 +886,16 @@ EXPORT_SYMBOL(tcp_syn_flood_action); */ static struct ip_options_rcu *tcp_v4_save_options(struct sk_buff *skb) { - const struct ip_options *opt = &(IPCB(skb)->opt); + const struct ip_options *opt = &TCP_SKB_CB(skb)->header.h4.opt; struct ip_options_rcu *dopt = NULL; if (opt && opt->optlen) { int opt_size = sizeof(*dopt) + opt->optlen; dopt = kmalloc(opt_size, GFP_ATOMIC); - if (dopt) { - if (ip_options_echo(&dopt->opt, skb)) { - kfree(dopt); - dopt = NULL; - } + if (dopt && __ip_options_echo(&dopt->opt, skb, opt)) { + kfree(dopt); + dopt = NULL; } } return dopt; @@ -1431,7 +1429,7 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb) #ifdef CONFIG_SYN_COOKIES if (!th->syn) - sk = cookie_v4_check(sk, skb, &(IPCB(skb)->opt)); + sk = cookie_v4_check(sk, skb, &TCP_SKB_CB(skb)->header.h4.opt); #endif return sk; } @@ -1636,6 +1634,13 @@ int tcp_v4_rcv(struct sk_buff *skb) th = tcp_hdr(skb); iph = ip_hdr(skb); + /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() + * barrier() makes sure compiler wont play fool^Waliasing games. + */ + memmove(&TCP_SKB_CB(skb)->header.h4, IPCB(skb), + sizeof(struct inet_skb_parm)); + barrier(); + TCP_SKB_CB(skb)->seq = ntohl(th->seq); TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + skb->len - th->doff * 4); diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c index f173b1c4f815..a462fb1db896 100644 --- a/net/ipv4/tcp_output.c +++ b/net/ipv4/tcp_output.c @@ -974,6 +974,11 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it, /* Our usage of tstamp should remain private */ skb->tstamp.tv64 = 0; + + /* Cleanup our debris for IP stacks */ + memset(skb->cb, 0, max(sizeof(struct inet_skb_parm), + sizeof(struct inet6_skb_parm))); + err = icsk->icsk_af_ops->queue_xmit(sk, skb, &inet->cork.fl); if (likely(err <= 0)) diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 9400b4326f22..132bac137aed 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1412,6 +1412,13 @@ static int tcp_v6_rcv(struct sk_buff *skb) th = tcp_hdr(skb); hdr = ipv6_hdr(skb); + /* This is tricky : We move IPCB at its correct location into TCP_SKB_CB() + * barrier() makes sure compiler wont play fool^Waliasing games. + */ + memmove(&TCP_SKB_CB(skb)->header.h6, IP6CB(skb), + sizeof(struct inet6_skb_parm)); + barrier(); + TCP_SKB_CB(skb)->seq = ntohl(th->seq); TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + skb->len - th->doff*4); |