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pimd: Fixup kernel callbacks to handle them better
This patch sets up the handling of the 3 basic kernel callbacks: IGMPMSG_WRONGVIF - When a multicast message comes in the wrong vif IGMPMSG_NOCACHE - There is no multicast route associated with a received(S,G) IGMPMSG_WHOLEPKT - There is no outgoing interface for a packet. The code's debugs are cleaned up to be covered by debug statements Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp
Donald Sharp
parent
b45cefcb44
commit
e355e30fcb
@ -61,135 +61,169 @@ static int pim_mroute_set(int fd, int enable)
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return 0;
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}
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static const char *igmpmsgtype2str[IGMPMSG_WHOLEPKT + 1] = {
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"<unknown_upcall?>",
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"NOCACHE",
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"WRONGVIF",
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"WHOLEPKT", };
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static int
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pim_mroute_msg_nocache (int fd, struct interface *ifp, const struct igmpmsg *msg,
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const char *src_str, const char *grp_str)
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{
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return 0;
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}
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static int
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pim_mroute_msg_wholepkt (int fd, struct interface *ifp, const struct igmpmsg *msg,
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const char *src_str, const char *grp_str)
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{
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return 0;
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}
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static int
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pim_mroute_msg_wrongvif (int fd, struct interface *ifp, const struct igmpmsg *msg,
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const char *src_str, const char *grp_str)
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{
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struct pim_ifchannel *ch;
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struct pim_interface *pim_ifp;
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/*
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Send Assert(S,G) on iif as response to WRONGVIF kernel upcall.
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RFC 4601 4.8.2. PIM-SSM-Only Routers
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iif is the incoming interface of the packet.
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if (iif is in inherited_olist(S,G)) {
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send Assert(S,G) on iif
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}
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*/
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if (!ifp) {
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: WRONGVIF (S,G)=(%s,%s) could not find input interface for input_vif_index=%d",
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__PRETTY_FUNCTION__,
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src_str, grp_str, msg->im_vif);
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}
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return -1;
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}
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pim_ifp = ifp->info;
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if (!pim_ifp) {
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: WRONGVIF (S,G)=(%s,%s) multicast not enabled on interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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}
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return -2;
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}
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ch = pim_ifchannel_find(ifp, msg->im_src, msg->im_dst);
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if (!ch) {
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: WRONGVIF (S,G)=(%s,%s) could not find channel on interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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}
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return -3;
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}
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/*
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RFC 4601: 4.6.1. (S,G) Assert Message State Machine
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Transitions from NoInfo State
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An (S,G) data packet arrives on interface I, AND
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CouldAssert(S,G,I)==TRUE An (S,G) data packet arrived on an
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downstream interface that is in our (S,G) outgoing interface
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list. We optimistically assume that we will be the assert
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winner for this (S,G), and so we transition to the "I am Assert
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Winner" state and perform Actions A1 (below), which will
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initiate the assert negotiation for (S,G).
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*/
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if (ch->ifassert_state != PIM_IFASSERT_NOINFO) {
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: WRONGVIF (S,G)=(%s,%s) channel is not on Assert NoInfo state for interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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}
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return -4;
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}
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if (!PIM_IF_FLAG_TEST_COULD_ASSERT(ch->flags)) {
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: WRONGVIF (S,G)=(%s,%s) interface %s is not downstream for channel",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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}
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return -5;
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}
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if (assert_action_a1(ch)) {
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: WRONGVIF (S,G)=(%s,%s) assert_action_a1 failure on interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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}
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return -6;
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}
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return 0;
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}
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int pim_mroute_msg(int fd, const char *buf, int buf_size)
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{
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struct interface *ifp;
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const struct ip *ip_hdr;
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const struct igmpmsg *msg;
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const char *upcall;
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char src_str[100];
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char grp_str[100];
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char src_str[100] = "<src?>";
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char grp_str[100] = "<grp?>";
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ip_hdr = (const struct ip *) buf;
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/* kernel upcall must have protocol=0 */
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if (ip_hdr->ip_p) {
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/* this is not a kernel upcall */
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#ifdef PIM_UNEXPECTED_KERNEL_UPCALL
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zlog_warn("%s: not a kernel upcall proto=%d msg_size=%d",
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__PRETTY_FUNCTION__, ip_hdr->ip_p, buf_size);
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#endif
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: not a kernel upcall proto=%d msg_size=%d",
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__PRETTY_FUNCTION__, ip_hdr->ip_p, buf_size);
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}
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return 0;
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}
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msg = (const struct igmpmsg *) buf;
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switch (msg->im_msgtype) {
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case IGMPMSG_NOCACHE: upcall = "NOCACHE"; break;
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case IGMPMSG_WRONGVIF: upcall = "WRONGVIF"; break;
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case IGMPMSG_WHOLEPKT: upcall = "WHOLEPKT"; break;
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default: upcall = "<unknown_upcall?>";
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}
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ifp = pim_if_find_by_vif_index(msg->im_vif);
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pim_inet4_dump("<src?>", msg->im_src, src_str, sizeof(src_str));
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pim_inet4_dump("<grp?>", msg->im_dst, grp_str, sizeof(grp_str));
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if (msg->im_msgtype == IGMPMSG_WRONGVIF) {
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struct pim_ifchannel *ch;
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struct pim_interface *pim_ifp;
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/*
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Send Assert(S,G) on iif as response to WRONGVIF kernel upcall.
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RFC 4601 4.8.2. PIM-SSM-Only Routers
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iif is the incoming interface of the packet.
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if (iif is in inherited_olist(S,G)) {
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send Assert(S,G) on iif
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}
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*/
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if (PIM_DEBUG_PIM_TRACE) {
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pim_inet4_dump("<src?>", msg->im_src, src_str, sizeof(src_str));
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pim_inet4_dump("<grp?>", msg->im_dst, grp_str, sizeof(grp_str));
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zlog_warn("%s: kernel upcall %s type=%d ip_p=%d from fd=%d for (S,G)=(%s,%s) on %s vifi=%d",
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__PRETTY_FUNCTION__,
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igmpmsgtype2str[msg->im_msgtype],
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msg->im_msgtype,
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ip_hdr->ip_p,
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fd,
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src_str,
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grp_str,
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ifp ? ifp->name : "<ifname?>",
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msg->im_vif);
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}
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if (PIM_DEBUG_PIM_TRACE) {
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zlog_debug("%s: WRONGVIF from fd=%d for (S,G)=(%s,%s) on %s vifi=%d",
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__PRETTY_FUNCTION__,
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fd,
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src_str,
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grp_str,
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ifp ? ifp->name : "<ifname?>",
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msg->im_vif);
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}
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if (!ifp) {
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zlog_warn("%s: WRONGVIF (S,G)=(%s,%s) could not find input interface for input_vif_index=%d",
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__PRETTY_FUNCTION__,
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src_str, grp_str, msg->im_vif);
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return -1;
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}
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pim_ifp = ifp->info;
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if (!pim_ifp) {
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zlog_warn("%s: WRONGVIF (S,G)=(%s,%s) multicast not enabled on interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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return -2;
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}
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ch = pim_ifchannel_find(ifp, msg->im_src, msg->im_dst);
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if (!ch) {
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zlog_warn("%s: WRONGVIF (S,G)=(%s,%s) could not find channel on interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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return -3;
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}
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/*
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RFC 4601: 4.6.1. (S,G) Assert Message State Machine
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Transitions from NoInfo State
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An (S,G) data packet arrives on interface I, AND
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CouldAssert(S,G,I)==TRUE An (S,G) data packet arrived on an
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downstream interface that is in our (S,G) outgoing interface
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list. We optimistically assume that we will be the assert
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winner for this (S,G), and so we transition to the "I am Assert
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Winner" state and perform Actions A1 (below), which will
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initiate the assert negotiation for (S,G).
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*/
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if (ch->ifassert_state != PIM_IFASSERT_NOINFO) {
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zlog_warn("%s: WRONGVIF (S,G)=(%s,%s) channel is not on Assert NoInfo state for interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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return -4;
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}
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if (!PIM_IF_FLAG_TEST_COULD_ASSERT(ch->flags)) {
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zlog_warn("%s: WRONGVIF (S,G)=(%s,%s) interface %s is not downstream for channel",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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return -5;
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}
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if (assert_action_a1(ch)) {
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zlog_warn("%s: WRONGVIF (S,G)=(%s,%s) assert_action_a1 failure on interface %s",
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__PRETTY_FUNCTION__,
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src_str, grp_str, ifp->name);
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return -6;
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}
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return 0;
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} /* IGMPMSG_WRONGVIF */
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zlog_warn("%s: kernel upcall %s type=%d ip_p=%d from fd=%d for (S,G)=(%s,%s) on %s vifi=%d",
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__PRETTY_FUNCTION__,
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upcall,
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msg->im_msgtype,
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ip_hdr->ip_p,
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fd,
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src_str,
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grp_str,
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ifp ? ifp->name : "<ifname?>",
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msg->im_vif);
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switch (msg->im_msgtype) {
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case IGMPMSG_WRONGVIF:
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return pim_mroute_msg_wrongvif(fd, ifp, msg, src_str, grp_str);
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break;
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case IGMPMSG_NOCACHE:
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return pim_mroute_msg_nocache(fd, ifp, msg, src_str, grp_str);
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break;
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case IGMPMSG_WHOLEPKT:
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return pim_mroute_msg_wholepkt(fd, ifp, msg, src_str, grp_str);
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break;
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default:
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break;
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}
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return 0;
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}
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