diff options
| author | Pau Espin Pedrol <pespin@sysmocom.de> | 2020-04-18 23:47:06 +0200 |
|---|---|---|
| committer | laforge <laforge@osmocom.org> | 2020-04-19 08:29:35 +0000 |
| commit | ff2ebee03baf92609dc14bb1324cd069bf5c8323 (patch) | |
| tree | 58d98a488f7b55357dfcf1bb83658edf3e09c495 /sgsnemu | |
| parent | 2a1cedd2dc844ad6cabcd6f08791f16e0f4febae (diff) | |
sgsnemu: Fix build/run against linux < 4.11 (no sysctl addr_gen_mode support)
On older systems (like debian 8), the enum is not present in the header
file and build will fail (as saw in osmocom's OBS instance).
Furthermore, the sysctl to change the value was added at a later point
in time, which means compiling can go fine but running may fail due to
the sysctl not being available.
This is a fix-up to Change-Id I1d51f3ca91edbb3b788939982ab63264182ec2ce
Change-Id: I208970d5b16ea7148444d414b0a6f68c8d9a086c
Diffstat (limited to 'sgsnemu')
| -rw-r--r-- | sgsnemu/sgsnemu.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/sgsnemu/sgsnemu.c b/sgsnemu/sgsnemu.c index c28df52..ea52da6 100644 --- a/sgsnemu/sgsnemu.c +++ b/sgsnemu/sgsnemu.c @@ -15,6 +15,8 @@ * */ +#include "config.h" + #ifdef __linux__ #define _GNU_SOURCE 1 /* strdup() prototype, broken arpa/inet.h */ #endif @@ -47,10 +49,11 @@ #include <time.h> #if defined(__linux__) +#if defined(HAVE_IN6_ADDR_GEN_MODE_NONE) #include <linux/if_link.h> +#endif // HAVE_IN6_ADDR_GEN_MODE_NONE #endif -#include "config.h" #include "../lib/tun.h" #include "../lib/ippool.h" #include "../lib/syserr.h" @@ -1702,13 +1705,16 @@ int main(int argc, char **argv) exit(1); } -#if defined(__linux__) - /* Avoid tunnel setting its own link-local addr automatically, we don't need it. */ +#if defined(__linux__) && defined(HAVE_IN6_ADDR_GEN_MODE_NONE) + /* Avoid tunnel setting its own link-local addr automatically, + we don't need it. Don't exit on error since this sysctl is + only available starting with linux 4.11. */ snprintf(buf, sizeof(buf), "%u", IN6_ADDR_GEN_MODE_NONE); if (proc_ipv6_conf_write(options.tun_dev_name, "addr_gen_mode", buf) < 0) { SYS_ERR(DSGSN, LOGL_ERROR, errno, - "Failed to disable addr_gen_mode on %s\n", options.tun_dev_name); - exit(1); + "Failed to disable addr_gen_mode on %s, an extra link-local " + "ip address will appear on the tun device.\n", + options.tun_dev_name); } #endif |