[TCP]: cleanup tcp_parse_options deep indented switch

Removed case indentation level & combined some nested ifs, mostly
within 80 lines now. This is a leftover from indent patch, it
just had to be done manually to avoid messing it up completely.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/tcp_input.c

@@ -3278,81 +3278,80 @@ void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx,
 		int opsize;
 
 		switch (opcode) {
-			case TCPOPT_EOL:
+		case TCPOPT_EOL:
+			return;
+		case TCPOPT_NOP:	/* Ref: RFC 793 section 3.1 */
+			length--;
+			continue;
+		default:
+			opsize = *ptr++;
+			if (opsize < 2) /* "silly options" */
 				return;
-			case TCPOPT_NOP:	/* Ref: RFC 793 section 3.1 */
-				length--;
-				continue;
-			default:
-				opsize=*ptr++;
-				if (opsize < 2) /* "silly options" */
-					return;
-				if (opsize > length)
-					return;	/* don't parse partial options */
-				switch (opcode) {
-				case TCPOPT_MSS:
-					if (opsize==TCPOLEN_MSS && th->syn && !estab) {
-						u16 in_mss = ntohs(get_unaligned((__be16 *)ptr));
-						if (in_mss) {
-							if (opt_rx->user_mss && opt_rx->user_mss < in_mss)
-								in_mss = opt_rx->user_mss;
-							opt_rx->mss_clamp = in_mss;
-						}
-					}
-					break;
-				case TCPOPT_WINDOW:
-					if (opsize==TCPOLEN_WINDOW && th->syn && !estab)
-						if (sysctl_tcp_window_scaling) {
-							__u8 snd_wscale = *(__u8 *) ptr;
-							opt_rx->wscale_ok = 1;
-							if (snd_wscale > 14) {
-								if (net_ratelimit())
-									printk(KERN_INFO "tcp_parse_options: Illegal window "
-									       "scaling value %d >14 received.\n",
-									       snd_wscale);
-								snd_wscale = 14;
-							}
-							opt_rx->snd_wscale = snd_wscale;
-						}
-					break;
-				case TCPOPT_TIMESTAMP:
-					if (opsize==TCPOLEN_TIMESTAMP) {
-						if ((estab && opt_rx->tstamp_ok) ||
-						    (!estab && sysctl_tcp_timestamps)) {
-							opt_rx->saw_tstamp = 1;
-							opt_rx->rcv_tsval = ntohl(get_unaligned((__be32 *)ptr));
-							opt_rx->rcv_tsecr = ntohl(get_unaligned((__be32 *)(ptr+4)));
-						}
+			if (opsize > length)
+				return;	/* don't parse partial options */
+			switch (opcode) {
+			case TCPOPT_MSS:
+				if (opsize == TCPOLEN_MSS && th->syn && !estab) {
+					u16 in_mss = ntohs(get_unaligned((__be16 *)ptr));
+					if (in_mss) {
+						if (opt_rx->user_mss &&
+						    opt_rx->user_mss < in_mss)
+							in_mss = opt_rx->user_mss;
+						opt_rx->mss_clamp = in_mss;
 					}
-					break;
-				case TCPOPT_SACK_PERM:
-					if (opsize==TCPOLEN_SACK_PERM && th->syn && !estab) {
-						if (sysctl_tcp_sack) {
-							opt_rx->sack_ok = 1;
-							tcp_sack_reset(opt_rx);
-						}
+				}
+				break;
+			case TCPOPT_WINDOW:
+				if (opsize == TCPOLEN_WINDOW && th->syn &&
+				    !estab && sysctl_tcp_window_scaling) {
+					__u8 snd_wscale = *(__u8 *)ptr;
+					opt_rx->wscale_ok = 1;
+					if (snd_wscale > 14) {
+						if (net_ratelimit())
+							printk(KERN_INFO "tcp_parse_options: Illegal window "
+							       "scaling value %d >14 received.\n",
+							       snd_wscale);
+						snd_wscale = 14;
 					}
-					break;
+					opt_rx->snd_wscale = snd_wscale;
+				}
+				break;
+			case TCPOPT_TIMESTAMP:
+				if ((opsize == TCPOLEN_TIMESTAMP) &&
+				    ((estab && opt_rx->tstamp_ok) ||
+				     (!estab && sysctl_tcp_timestamps))) {
+					opt_rx->saw_tstamp = 1;
+					opt_rx->rcv_tsval = ntohl(get_unaligned((__be32 *)ptr));
+					opt_rx->rcv_tsecr = ntohl(get_unaligned((__be32 *)(ptr+4)));
+				}
+				break;
+			case TCPOPT_SACK_PERM:
+				if (opsize == TCPOLEN_SACK_PERM && th->syn &&
+				    !estab && sysctl_tcp_sack) {
+					opt_rx->sack_ok = 1;
+					tcp_sack_reset(opt_rx);
+				}
+				break;
 
-				case TCPOPT_SACK:
-					if ((opsize >= (TCPOLEN_SACK_BASE + TCPOLEN_SACK_PERBLOCK)) &&
-					   !((opsize - TCPOLEN_SACK_BASE) % TCPOLEN_SACK_PERBLOCK) &&
-					   opt_rx->sack_ok) {
-						TCP_SKB_CB(skb)->sacked = (ptr - 2) - (unsigned char *)th;
-					}
-					break;
+			case TCPOPT_SACK:
+				if ((opsize >= (TCPOLEN_SACK_BASE + TCPOLEN_SACK_PERBLOCK)) &&
+				   !((opsize - TCPOLEN_SACK_BASE) % TCPOLEN_SACK_PERBLOCK) &&
+				   opt_rx->sack_ok) {
+					TCP_SKB_CB(skb)->sacked = (ptr - 2) - (unsigned char *)th;
+				}
+				break;
 #ifdef CONFIG_TCP_MD5SIG
-				case TCPOPT_MD5SIG:
-					/*
-					 * The MD5 Hash has already been
-					 * checked (see tcp_v{4,6}_do_rcv()).
-					 */
-					break;
+			case TCPOPT_MD5SIG:
+				/*
+				 * The MD5 Hash has already been
+				 * checked (see tcp_v{4,6}_do_rcv()).
+				 */
+				break;
 #endif
-				}
+			}
 
-				ptr+=opsize-2;
-				length-=opsize;
+			ptr += opsize-2;
+			length -= opsize;
 		}
 	}
 }