@@ -271,6 +271,7 @@ static int ipv6_clear_mutable_options(struct ipv6hdr *iph, int len, int dir)
case NEXTHDR_DEST:
if (dir == XFRM_POLICY_OUT)
ipv6_rearrange_destopt(iph, exthdr.opth);
+ /* fall through */
case NEXTHDR_HOP:
if (!zero_out_mutable_opts(exthdr.opth)) {
net_dbg_ratelimited("overrun %sopts\n",
@@ -89,6 +89,7 @@ static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff)
*/
if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
break;
+ /* fall through */
case 2: /* send ICMP PARM PROB regardless and drop packet */
icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
return false;
@@ -864,10 +864,8 @@ static int icmpv6_rcv(struct sk_buff *skb)
goto discard_it;
hdr = icmp6_hdr(skb);
- /*
- * Drop through to notify
- */
-
+ /* to notify */
+ /* fall through */
case ICMPV6_DEST_UNREACH:
case ICMPV6_TIME_EXCEED:
case ICMPV6_PARAMPROB:
@@ -1777,6 +1777,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
}
w->state = FWS_L;
#endif
+ /* fall through */
case FWS_L:
left = rcu_dereference_protected(fn->left, 1);
if (left) {
@@ -1785,6 +1786,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
continue;
}
w->state = FWS_R;
+ /* fall through */
case FWS_R:
right = rcu_dereference_protected(fn->right, 1);
if (right) {
@@ -1794,6 +1796,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
}
w->state = FWS_C;
w->leaf = rcu_dereference_protected(fn->leaf, 1);
+ /* fall through */
case FWS_C:
if (w->leaf && fn->fn_flags & RTN_RTINFO) {
int err;
@@ -1812,6 +1815,7 @@ static int fib6_walk_continue(struct fib6_walker *w)
}
skip:
w->state = FWS_U;
+ /* fall through */
case FWS_U:
if (fn == w->root)
return 0;
@@ -593,6 +593,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
case NDISC_REDIRECT:
rel_type = ICMP_REDIRECT;
rel_code = ICMP_REDIR_HOST;
+ /* fall through */
default:
return 0;
}
@@ -1722,6 +1722,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
case MRT6_ADD_MFC:
case MRT6_DEL_MFC:
parent = -1;
+ /* fall through */
case MRT6_ADD_MFC_PROXY:
case MRT6_DEL_MFC_PROXY:
if (optlen < sizeof(mfc))
@@ -290,7 +290,8 @@ nf_nat_ipv6_fn(void *priv, struct sk_buff *skb,
else
return NF_ACCEPT;
}
- /* Fall thru... (Only ICMPs can be IP_CT_IS_REPLY) */
+ /* Only ICMPs can be IP_CT_IS_REPLY: */
+ /* fall through */
case IP_CT_NEW:
/* Seen it before? This can happen for loopback, retrans,
* or local packets.
@@ -1055,6 +1055,7 @@ static int rawv6_setsockopt(struct sock *sk, int level, int optname,
if (optname == IPV6_CHECKSUM ||
optname == IPV6_HDRINCL)
break;
+ /* fall through */
default:
return ipv6_setsockopt(sk, level, optname, optval, optlen);
}
@@ -1077,6 +1078,7 @@ static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
if (optname == IPV6_CHECKSUM ||
optname == IPV6_HDRINCL)
break;
+ /* fall through */
default:
return compat_ipv6_setsockopt(sk, level, optname,
optval, optlen);
@@ -1138,6 +1140,7 @@ static int rawv6_getsockopt(struct sock *sk, int level, int optname,
if (optname == IPV6_CHECKSUM ||
optname == IPV6_HDRINCL)
break;
+ /* fall through */
default:
return ipv6_getsockopt(sk, level, optname, optval, optlen);
}
@@ -1160,6 +1163,7 @@ static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
if (optname == IPV6_CHECKSUM ||
optname == IPV6_HDRINCL)
break;
+ /* fall through */
default:
return compat_ipv6_getsockopt(sk, level, optname,
optval, optlen);
@@ -1577,8 +1577,9 @@ static int tcp_v6_rcv(struct sk_buff *skb)
refcounted = false;
goto process;
}
- /* Fall through to ACK */
}
+ /* to ACK */
+ /* fall through */
case TCP_TW_ACK:
tcp_v6_timewait_ack(sk, skb);
break;
@@ -152,6 +152,7 @@ _decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
switch (nexthdr) {
case NEXTHDR_FRAGMENT:
onlyproto = 1;
+ /* fall through */
case NEXTHDR_ROUTING:
case NEXTHDR_HOP:
case NEXTHDR_DEST:
In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. Notice that in some cases I placed the "fall through" comment on its own line, which is what GCC is expecting to find. Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> --- This code was tested by compilation only (GCC 7.2.0 was used). Please, verify if the actual intention of the code is to fall through. net/ipv6/ah6.c | 1 + net/ipv6/exthdrs.c | 1 + net/ipv6/icmp.c | 6 ++---- net/ipv6/ip6_fib.c | 4 ++++ net/ipv6/ip6_tunnel.c | 1 + net/ipv6/ip6mr.c | 1 + net/ipv6/netfilter/nf_nat_l3proto_ipv6.c | 3 ++- net/ipv6/raw.c | 4 ++++ net/ipv6/tcp_ipv6.c | 3 ++- net/ipv6/xfrm6_policy.c | 1 + 10 files changed, 19 insertions(+), 6 deletions(-)