netdev - Kernel build failure from d9282e48c6088

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Date:   Sat, 19 Nov 2022 14:28:34 -0800
From:   Colin Foster <colin.foster@...advantage.com>
To:     Jamie Bainbridge <jamie.bainbridge@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Kernel build failure from d9282e48c6088

Just a heads up, commit d9282e48c6088 ("tcp: Add listening address to
SYN flood message") breaks if CONFIG_IPV6 isn't enabled.

A simple change from an if() to a macro and I'm on my merry way. Not
sure if you want anything more than that.

In file included from ./include/asm-generic/bug.h:22,
                 from ./arch/arm/include/asm/bug.h:60,
                 from ./include/linux/bug.h:5,
                 from ./include/linux/mmdebug.h:5,
                 from ./include/linux/mm.h:6,
                 from net/ipv4/tcp_input.c:67:
net/ipv4/tcp_input.c: In function ‘tcp_syn_flood_action’:
./include/net/sock.h:387:37: error: ‘const struct sock_common’ has no member named ‘skc_v6_rcv_saddr’; did you mean ‘skc_rcv_saddr’?
  387 | #define sk_v6_rcv_saddr __sk_common.skc_v6_rcv_saddr
      |                                     ^~~~~~~~~~~~~~~~
./include/linux/printk.h:429:19: note: in definition of macro ‘printk_index_wrap’
  429 |   _p_func(_fmt, ##__VA_ARGS__);    \
      |                   ^~~~~~~~~~~
./include/linux/printk.h:530:2: note: in expansion of macro ‘printk’
  530 |  printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
      |  ^~~~~~
./include/linux/net.h:272:3: note: in expansion of macro ‘pr_info’
  272 |   function(__VA_ARGS__);    \
      |   ^~~~~~~~
./include/linux/net.h:288:2: note: in expansion of macro ‘net_ratelimited_function’
  288 |  net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
      |  ^~~~~~~~~~~~~~~~~~~~~~~~
./include/linux/net.h:288:43: note: in expansion of macro ‘sk_v6_rcv_saddr’
  288 |  net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
      |                                           ^~~~~~~~~~~
net/ipv4/tcp_input.c:6847:4: note: in expansion of macro ‘net_info_ratelimited’
 6847 |    net_info_ratelimited("%s: Possible SYN flooding on port [%pI6c]:%u. %s.\n",
      |    ^~~~~~~~~~~~~~~~~~~~
  CC      net/ipv4/icmp.o
make[3]: *** [scripts/Makefile.build:250: net/ipv4/tcp_input.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [scripts/Makefile.build:500: net/ipv4] Error 2
make[1]: *** [scripts/Makefile.build:500: net] Error 2
make: *** [Makefile:1992: .] Error 2