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Message-ID: <2bpal7-l68.ln1@chipmunk.wormnet.eu> Date: Sat, 4 Sep 2010 22:12:34 +0100 From: Alexander Clouter <alex@...riz.org.uk> To: netdev@...r.kernel.org Subject: pimreg zombies Hi, I am writing a multicast pim daemon and noticed that if I call setsockopt(MRT_ADD_VIF), also occurs for IPv6 too, incorrectly on a socket established with socket(AF_INET, SOCK_RAW, IPPROTO_PIM)[1] then when the application quits I have zombie pimreg (and pimreg6) interfaces that can only be disposed of with a reboot. I have included the code below to give you something (hopefully) reproducible; this problem I see on a 2.6.35.4 kernel. No idea if there was ever a safe kernel but maybe all the recent namespace and multiple multicast routing table amendments broke something. Obviously I know for Linux I should be calling setsockopt() on the IGMP socket, however I'm pretty sure zombie pim's should not be appearing :) Cheers [1] rather than as I should on an IPPROTO_IGMP raw socket ---- #include <sys/types.h> #include <sys/socket.h> #include <unistd.h> #include <stdio.h> #include <sysexits.h> #include <string.h> #include <netinet/in.h> #include <linux/mroute.h> #include <linux/mroute6.h> int main(int argc, char **argv) { int pim4, pim6; struct vifctl v4; struct mif6ctl v6; pim4 = socket(AF_INET, SOCK_RAW, IPPROTO_PIM); if (pim4 < 0) { perror("socket(AF_INET, SOCK_RAW, IPPROTO_PIM)"); return EX_OSERR; } memset(&v4, 0, sizeof(v4)); v4.vifc_flags = VIFF_REGISTER; if (setsockopt(pim4, IPPROTO_IP, MRT_ADD_VIF, &v4, sizeof(v4)) < 0) { perror("setsockopt(MRT_ADD_VIF)"); close(pim4); return EX_OSERR; } close(pim4); /***********************/ pim6 = socket(AF_INET6, SOCK_RAW, IPPROTO_PIM); if (pim6 < 0) { perror("socket(AF_INET6, SOCK_RAW, IPPROTO_PIM)"); return EX_OSERR; } memset(&v6, 0, sizeof(v6)); v6.mif6c_flags = MIFF_REGISTER; if (setsockopt(pim6, IPPROTO_IPV6, MRT6_ADD_MIF, &v6, sizeof(v6)) < 0) { perror("setsockopt(MRT6_ADD_MIF)"); close(pim6); return EX_OSERR; } close(pim6); return EX_OK; } ---- -- Alexander Clouter .sigmonster says: You have junk mail. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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