On Thu, 5 Oct 2023 14:44:39 +1100 David Gibson <david(a)gibson.dropbear.id.au> wrote:procfs_scan_listen() does some slightly clunky logic to deduce the fd it wants to use, the path it wants to open and the state it's looking for based on parameters for protocol, IP version and whether we're in the namespace. However, the caller already has to make choices based on similar parameters so it can just pass in the things that procfs_scan_listen() needs directly. Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au> --- port_fwd.c | 53 +++++++++++++++++++++++------------------------------ 1 file changed, 23 insertions(+), 30 deletions(-) diff --git a/port_fwd.c b/port_fwd.c index 136a450..4b54877 100644 --- a/port_fwd.c +++ b/port_fwd.c @@ -23,39 +23,27 @@ #include "passt.h" #include "lineread.h" +#define UDP_LISTEN 0x07 +#define TCP_LISTEN 0x0a + /** * procfs_scan_listen() - Set bits for listening TCP or UDP sockets from procfs - * @proto: IPPROTO_TCP or IPPROTO_UDP - * @ip_version: IP version, V4 or V6 - * @ns: Use saved file descriptors for namespace if set + * @fd: Pointer to fd for relevant /proc/net file + * @path: Path to /proc/net file to open (if fd is -1) + * @lstate: Code for listening state to scan for * @map: Bitmap where numbers of ports in listening state will be set * @exclude: Bitmap of ports to exclude from setting (and clear) * * #syscalls:pasta lseek * #syscalls:pasta ppc64le:_llseek ppc64:_llseek armv6l:_llseek armv7l:_llseek */ -static void procfs_scan_listen(struct ctx *c, uint8_t proto, int ip_version, - int ns, uint8_t *map, const uint8_t *exclude) +static void procfs_scan_listen(int *fd, const char *path, unsigned int lstate, + uint8_t *map, const uint8_t *exclude) { - char *path, *line; struct lineread lr; unsigned long port; unsigned int state; - int *fd; - - if (proto == IPPROTO_TCP) { - fd = &c->proc_net_tcp[ip_version][ns]; - if (ip_version == V4) - path = "/proc/net/tcp"; - else - path = "/proc/net/tcp6"; - } else { - fd = &c->proc_net_udp[ip_version][ns]; - if (ip_version == V4) - path = "/proc/net/udp"; - else - path = "/proc/net/udp6"; - } + char *line; if (*fd != -1) { if (lseek(*fd, 0, SEEK_SET)) { @@ -74,8 +62,7 @@ static void procfs_scan_listen(struct ctx *c, uint8_t proto, int ip_version, continue; /* See enum in kernel's include/net/tcp_states.h */This comment should now be moved before #define UDP_LISTEN and TCP_LISTEN, as it's not otherwise clear where they're coming from. Given how late I'm reviewing all this, and that presumably you have a bunch of series/patches based on it, I'm also fine to apply this and patch it in a separate commit, or also fix this up on merge myself -- let me know. Same for the comments to the next patches/series. -- Stefano