LCOV - code coverage report
Current view: top level - disco/netlink - fd_netlink_tile.c (source / functions) Hit Total Coverage
Test: cov.lcov Lines: 51 274 18.6 %
Date: 2025-03-20 12:08:36 Functions: 4 14 28.6 %

          Line data    Source code
       1             : #include "fd_netlink_tile_private.h"
       2             : #include "../topo/fd_topo.h"
       3             : #include "../topo/fd_topob.h"
       4             : #include "../topo/fd_pod_format.h"
       5             : #include "../metrics/fd_metrics.h"
       6             : #include "../../waltz/ip/fd_fib4_netlink.h"
       7             : #include "../../waltz/mib/fd_netdev_netlink.h"
       8             : #include "../../waltz/neigh/fd_neigh4_netlink.h"
       9             : #include "../../util/log/fd_dtrace.h"
      10             : 
      11             : #include <errno.h>
      12             : #include <net/if.h>
      13             : #include <netinet/in.h> /* MSG_DONTWAIT */
      14             : #include <sys/socket.h> /* SOL_{...} */
      15             : #include <sys/random.h> /* getrandom */
      16             : #include <sys/time.h> /* struct timeval */
      17             : #include <linux/rtnetlink.h> /* RTM_{...} */
      18             : 
      19             : #define FD_SOCKADDR_IN_SZ sizeof(struct sockaddr_in)
      20             : #include "generated/netlink_seccomp.h"
      21             : 
      22             : /* Hardcoded limits */
      23           3 : #define NETDEV_MAX      (256U)
      24           3 : #define BOND_MASTER_MAX (256U)
      25             : 
      26             : void
      27             : fd_netlink_topo_create( fd_topo_tile_t * netlink_tile,
      28             :                         fd_topo_t *      topo,
      29             :                         ulong            netlnk_max_routes,
      30             :                         ulong            netlnk_max_neighbors,
      31           3 :                         char const *     bind_interface ) {
      32           3 :   fd_topo_obj_t * netdev_dbl_buf_obj = fd_topob_obj( topo, "dbl_buf",     "netbase" );
      33           3 :   fd_topo_obj_t * fib4_main_obj      = fd_topob_obj( topo, "fib4",        "netbase" );
      34           3 :   fd_topo_obj_t * fib4_local_obj     = fd_topob_obj( topo, "fib4",        "netbase" );
      35           3 :   fd_topo_obj_t * neigh4_obj         = fd_topob_obj( topo, "neigh4_hmap", "netbase" );
      36           3 :   fd_topo_obj_t * neigh4_ele_obj     = fd_topob_obj( topo, "opaque",      "netbase" );
      37             : 
      38           3 :   fd_topob_tile_uses( topo, netlink_tile, netdev_dbl_buf_obj, FD_SHMEM_JOIN_MODE_READ_WRITE );
      39           3 :   fd_topob_tile_uses( topo, netlink_tile, fib4_main_obj,      FD_SHMEM_JOIN_MODE_READ_WRITE );
      40           3 :   fd_topob_tile_uses( topo, netlink_tile, fib4_local_obj,     FD_SHMEM_JOIN_MODE_READ_WRITE );
      41           3 :   fd_topob_tile_uses( topo, netlink_tile, neigh4_obj,         FD_SHMEM_JOIN_MODE_READ_WRITE );
      42           3 :   fd_topob_tile_uses( topo, netlink_tile, neigh4_ele_obj,     FD_SHMEM_JOIN_MODE_READ_WRITE );
      43             : 
      44             :   /* Configure double buffer of netdev table */
      45           3 :   ulong const netdev_dbl_buf_mtu = fd_netdev_tbl_footprint( NETDEV_MAX, BOND_MASTER_MAX );
      46           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, netdev_dbl_buf_mtu, "obj.%lu.mtu", netdev_dbl_buf_obj->id ) );
      47             : 
      48             :   /* Configure route table */
      49           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, netlnk_max_routes, "obj.%lu.route_max", fib4_main_obj->id  ) );
      50           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, netlnk_max_routes, "obj.%lu.route_max", fib4_local_obj->id ) );
      51             : 
      52             :   /* Configure neighbor hashmap: Open addressed hashmap with 3.0 sparsity
      53             :      factor and 16 long probe chain */
      54           3 :   ulong const neigh_ele_max   = fd_ulong_pow2_up( 3UL * netlnk_max_neighbors );
      55           3 :   ulong const neigh_ele_align = alignof(fd_neigh4_entry_t);
      56           3 :   ulong const neigh_ele_fp    = neigh_ele_max * sizeof(fd_neigh4_entry_t);
      57           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, neigh_ele_max,   "obj.%lu.ele_max",   neigh4_obj->id     ) );
      58           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, 16UL,            "obj.%lu.probe_max", neigh4_obj->id     ) );
      59           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props,  4UL,            "obj.%lu.lock_cnt",  neigh4_obj->id     ) );
      60           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, neigh_ele_align, "obj.%lu.align",     neigh4_ele_obj->id ) );
      61           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, neigh_ele_fp,    "obj.%lu.footprint", neigh4_ele_obj->id ) );
      62             : 
      63             :   /* Pick a random hashmap seed */
      64           3 :   ulong seed;
      65           3 :   FD_TEST( 8UL==getrandom( &seed, sizeof(ulong), 0 ) );
      66           3 :   FD_TEST( fd_pod_insertf_ulong( topo->props, seed, "obj.%lu.seed", neigh4_obj->id ) );
      67             : 
      68           3 :   netlink_tile->netlink.netdev_dbl_buf_obj_id = netdev_dbl_buf_obj->id;
      69           3 :   netlink_tile->netlink.fib4_main_obj_id      = fib4_main_obj->id;
      70           3 :   netlink_tile->netlink.fib4_local_obj_id     = fib4_local_obj->id;
      71           3 :   memcpy( netlink_tile->netlink.neigh_if, bind_interface, sizeof(netlink_tile->netlink.neigh_if) );
      72           3 :   netlink_tile->netlink.neigh4_obj_id         = neigh4_obj->id;
      73           3 :   netlink_tile->netlink.neigh4_ele_obj_id     = neigh4_ele_obj->id;
      74           3 : }
      75             : 
      76             : void
      77             : fd_netlink_topo_join( fd_topo_t *      topo,
      78             :                       fd_topo_tile_t * netlink_tile,
      79           3 :                       fd_topo_tile_t * join_tile ) {
      80           3 :   fd_topob_tile_uses( topo, join_tile, &topo->objs[ netlink_tile->netlink.neigh4_obj_id     ], FD_SHMEM_JOIN_MODE_READ_ONLY );
      81           3 :   fd_topob_tile_uses( topo, join_tile, &topo->objs[ netlink_tile->netlink.neigh4_ele_obj_id ], FD_SHMEM_JOIN_MODE_READ_ONLY );
      82           3 :   fd_topob_tile_uses( topo, join_tile, &topo->objs[ netlink_tile->netlink.fib4_main_obj_id  ], FD_SHMEM_JOIN_MODE_READ_ONLY );
      83           3 :   fd_topob_tile_uses( topo, join_tile, &topo->objs[ netlink_tile->netlink.fib4_local_obj_id ], FD_SHMEM_JOIN_MODE_READ_ONLY );
      84           3 : }
      85             : 
      86             : /* Begin tile methods */
      87             : 
      88             : FD_FN_CONST static inline ulong
      89           6 : scratch_align( void ) {
      90           6 :   return fd_ulong_max( alignof(fd_netlink_tile_ctx_t), FD_NETDEV_TBL_ALIGN );
      91           6 : }
      92             : 
      93             : FD_FN_PURE static inline ulong
      94           3 : scratch_footprint( fd_topo_tile_t const * tile ) {
      95           3 :   (void)tile;
      96           3 :   ulong l = FD_LAYOUT_INIT;
      97           3 :   l = FD_LAYOUT_APPEND( l, alignof(fd_netlink_tile_ctx_t), sizeof(fd_netlink_tile_ctx_t) );
      98           3 :   l = FD_LAYOUT_APPEND( l, fd_netdev_tbl_align(), fd_netdev_tbl_footprint( NETDEV_MAX, BOND_MASTER_MAX ) );
      99           3 :   return FD_LAYOUT_FINI( l, scratch_align() );
     100           3 : }
     101             : 
     102             : static ulong
     103             : populate_allowed_seccomp( fd_topo_t const *      topo,
     104             :                           fd_topo_tile_t const * tile,
     105             :                           ulong                  out_cnt,
     106           0 :                           struct sock_filter *   out ) {
     107           0 :   fd_netlink_tile_ctx_t * ctx = fd_topo_obj_laddr( topo, tile->tile_obj_id );
     108           0 :   FD_TEST( ctx->magic==FD_NETLINK_TILE_CTX_MAGIC );
     109           0 :   populate_sock_filter_policy_netlink( out_cnt, out, (uint)fd_log_private_logfile_fd(), (uint)ctx->nl_monitor->fd, (uint)ctx->nl_req->fd, (uint)ctx->prober->sock_fd );
     110           0 :   return sock_filter_policy_netlink_instr_cnt;
     111           0 : }
     112             : 
     113             : static ulong
     114             : populate_allowed_fds( fd_topo_t const *      topo,
     115             :                       fd_topo_tile_t const * tile,
     116             :                       ulong                  out_fds_cnt,
     117           0 :                       int *                  out_fds ) {
     118           0 :   fd_netlink_tile_ctx_t * ctx = fd_topo_obj_laddr( topo, tile->tile_obj_id );
     119           0 :   FD_TEST( ctx->magic==FD_NETLINK_TILE_CTX_MAGIC );
     120             : 
     121           0 :   if( FD_UNLIKELY( out_fds_cnt<5UL ) ) FD_LOG_ERR(( "out_fds_cnt too low (%lu)", out_fds_cnt ));
     122             : 
     123           0 :   ulong out_cnt = 0UL;
     124           0 :   out_fds[ out_cnt++ ] = 2; /* stderr */
     125           0 :   if( FD_LIKELY( -1!=fd_log_private_logfile_fd() ) )
     126           0 :     out_fds[ out_cnt++ ] = fd_log_private_logfile_fd(); /* logfile */
     127           0 :   out_fds[ out_cnt++ ] = ctx->nl_monitor->fd;
     128           0 :   out_fds[ out_cnt++ ] = ctx->nl_req->fd;
     129           0 :   out_fds[ out_cnt++ ] = ctx->prober->sock_fd;
     130           0 :   return out_cnt;
     131           0 : }
     132             : 
     133             : static void
     134             : privileged_init( fd_topo_t *      topo,
     135           0 :                  fd_topo_tile_t * tile ) {
     136           0 :   if( FD_UNLIKELY( tile->kind_id!=0 ) ) {
     137           0 :     FD_LOG_ERR(( "Topology contains more than one netlink tile" ));
     138           0 :   }
     139             : 
     140           0 :   uint const neigh_if_idx = if_nametoindex( tile->netlink.neigh_if );
     141           0 :   if( FD_UNLIKELY( !neigh_if_idx ) ) FD_LOG_ERR(( "if_nametoindex(%.16s) failed (%i-%s)", tile->netlink.neigh_if, errno, fd_io_strerror( errno ) ));
     142             : 
     143           0 :   fd_netlink_tile_ctx_t * ctx = fd_topo_obj_laddr( topo, tile->tile_obj_id );
     144           0 :   fd_memset( ctx, 0, sizeof(fd_netlink_tile_ctx_t) );
     145           0 :   ctx->magic = FD_NETLINK_TILE_CTX_MAGIC;
     146           0 :   ctx->neigh4_ifidx = neigh_if_idx;
     147             : 
     148           0 :   if( FD_UNLIKELY( !fd_netlink_init( ctx->nl_monitor, 1000U ) ) ) {
     149           0 :     FD_LOG_ERR(( "Failed to connect to rtnetlink" ));
     150           0 :   }
     151           0 :   if( FD_UNLIKELY( !fd_netlink_init( ctx->nl_req, 9000000U ) ) ) {
     152           0 :     FD_LOG_ERR(( "Failed to connect to rtnetlink" ));
     153           0 :   }
     154             : 
     155           0 :   union {
     156           0 :     struct sockaddr    sa;
     157           0 :     struct sockaddr_nl sanl;
     158           0 :   } sa;
     159           0 :   sa.sanl = (struct sockaddr_nl) {
     160           0 :     .nl_family = AF_NETLINK,
     161           0 :     .nl_groups = RTMGRP_LINK | RTMGRP_NEIGH | RTMGRP_IPV4_ROUTE
     162           0 :   };
     163           0 :   if( FD_UNLIKELY( 0!=bind( ctx->nl_monitor->fd, &sa.sa, sizeof(struct sockaddr_nl) ) ) ) {
     164           0 :     FD_LOG_ERR(( "bind(sock,RT_NETLINK,RTMGRP_{LINK,NEIGH,IPV4_ROUTE}) failed (%i-%s)", errno, fd_io_strerror( errno ) ));
     165           0 :   }
     166             : 
     167           0 :   float const max_probes_per_second =   3.f;
     168           0 :   ulong const max_probe_burst       = 128UL;
     169           0 :   float const probe_delay_seconds   =  15.f;
     170           0 :   fd_neigh4_prober_init( ctx->prober, max_probes_per_second, max_probe_burst, probe_delay_seconds );
     171             : 
     172             :   /* Set duration of blocking reads in before_credit */
     173           0 :   struct timeval tv = { .tv_usec = 2000 }; /* 2ms */
     174           0 :   if( FD_UNLIKELY( 0!=setsockopt( ctx->nl_monitor->fd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(struct timeval) ) ) ) {
     175           0 :     FD_LOG_ERR(( "setsockopt(sock,SOL_SOCKET,SO_RCVTIMEO) failed (%i-%s)", errno, fd_io_strerror( errno ) ));
     176           0 :   }
     177           0 : }
     178             : 
     179             : static void
     180             : unprivileged_init( fd_topo_t *      topo,
     181           0 :                    fd_topo_tile_t * tile ) {
     182           0 :   FD_SCRATCH_ALLOC_INIT( l, fd_topo_obj_laddr( topo, tile->tile_obj_id ) );
     183           0 :   fd_netlink_tile_ctx_t * ctx = FD_SCRATCH_ALLOC_APPEND( l, alignof(fd_netlink_tile_ctx_t), sizeof(fd_netlink_tile_ctx_t) );
     184           0 :   FD_TEST( ctx->magic==FD_NETLINK_TILE_CTX_MAGIC );
     185           0 :   ctx->netdev_sz    = fd_netdev_tbl_footprint( NETDEV_MAX, BOND_MASTER_MAX );
     186           0 :   ctx->netdev_local = FD_SCRATCH_ALLOC_APPEND( l, fd_netdev_tbl_align(), ctx->netdev_sz );
     187             : 
     188           0 :   FD_TEST( tile->netlink.netdev_dbl_buf_obj_id );
     189           0 :   FD_TEST( tile->netlink.neigh4_obj_id         );
     190           0 :   FD_TEST( tile->netlink.neigh4_ele_obj_id     );
     191           0 :   FD_TEST( tile->netlink.fib4_local_obj_id     );
     192           0 :   FD_TEST( tile->netlink.fib4_main_obj_id      );
     193             : 
     194           0 :   FD_TEST( fd_netdev_tbl_new( ctx->netdev_local, NETDEV_MAX, BOND_MASTER_MAX ) );
     195           0 :   FD_TEST( fd_netdev_tbl_join( ctx->netdev_tbl, ctx->netdev_local ) );
     196             : 
     197           0 :   FD_TEST( ctx->netdev_buf = fd_dbl_buf_join( fd_topo_obj_laddr( topo, tile->netlink.netdev_dbl_buf_obj_id ) ) );
     198             : 
     199           0 :   FD_TEST( fd_neigh4_hmap_join( ctx->neigh4, fd_topo_obj_laddr( topo, tile->netlink.neigh4_obj_id ), fd_topo_obj_laddr( topo, tile->netlink.neigh4_ele_obj_id ) ) );
     200           0 :   ctx->fib4_local = fd_fib4_join( fd_topo_obj_laddr( topo, tile->netlink.fib4_local_obj_id ) ); FD_TEST( ctx->fib4_local );
     201           0 :   ctx->fib4_main  = fd_fib4_join( fd_topo_obj_laddr( topo, tile->netlink.fib4_main_obj_id  ) ); FD_TEST( ctx->fib4_main  );
     202             : 
     203           0 :   for( ulong i=0UL; i<tile->in_cnt; i++ ) {
     204           0 :     fd_topo_link_t * link = &topo->links[ tile->in_link_id[ i ] ];
     205           0 :     if( FD_UNLIKELY( link->mtu!=0UL ) ) FD_LOG_ERR(( "netlink solicit links must have an MTU of zero" ));
     206           0 :   }
     207             : 
     208           0 :   ctx->action |= FD_NET_TILE_ACTION_LINK_UPDATE;
     209           0 :   ctx->action |= FD_NET_TILE_ACTION_ROUTE4_UPDATE;
     210           0 :   ctx->action |= FD_NET_TILE_ACTION_NEIGH_UPDATE;
     211             : 
     212           0 :   ctx->update_backoff = (long)( fd_tempo_tick_per_ns( NULL ) * 10e6 ); /* 10ms */
     213           0 : }
     214             : 
     215             : /* Begin stem methods
     216             : 
     217             :    Note: Using stem here might seem odd since fd_netlink_tile does not
     218             :    send or receive any messages.  Use of stem here is justified because of
     219             :    the initialization, generic metrics, and event loop functionality it
     220             :    provides. */
     221             : 
     222             : static inline void
     223           0 : metrics_write( fd_netlink_tile_ctx_t * ctx ) {
     224           0 :   FD_MCNT_SET(       NETLNK, DROP_EVENTS,             fd_netlink_enobufs_cnt            );
     225           0 :   FD_MCNT_SET(       NETLNK, LINK_FULL_SYNCS,         ctx->metrics.link_full_syncs      );
     226           0 :   FD_MCNT_SET(       NETLNK, ROUTE_FULL_SYNCS,        ctx->metrics.route_full_syncs     );
     227           0 :   FD_MCNT_ENUM_COPY( NETLNK, UPDATES,                 ctx->metrics.update_cnt           );
     228           0 :   FD_MGAUGE_SET(     NETLNK, INTERFACE_COUNT,         ctx->netdev_tbl->hdr->dev_cnt     );
     229           0 :   FD_MGAUGE_SET(     NETLNK, ROUTE_COUNT_LOCAL,       fd_fib4_cnt( ctx->fib4_local )    );
     230           0 :   FD_MGAUGE_SET(     NETLNK, ROUTE_COUNT_MAIN,        fd_fib4_cnt( ctx->fib4_main  )    );
     231           0 :   FD_MCNT_SET(       NETLNK, NEIGH_PROBE_SENT,        ctx->metrics.neigh_solicits_sent  );
     232           0 :   FD_MCNT_SET(       NETLNK, NEIGH_PROBE_FAILS,       ctx->metrics.neigh_solicits_fails );
     233           0 :   FD_MCNT_SET(       NETLNK, NEIGH_PROBE_RATE_LIMIT_HOST,   ctx->prober->local_rate_limited_cnt  );
     234           0 :   FD_MCNT_SET(       NETLNK, NEIGH_PROBE_RATE_LIMIT_GLOBAL, ctx->prober->global_rate_limited_cnt );
     235           0 : }
     236             : 
     237             : /* netlink_monitor_read calls recvfrom to process a link, route, or
     238             :    neighbor update.  Returns 1 if a message was read, 0 otherwise. */
     239             : 
     240             : static int
     241             : netlink_monitor_read( fd_netlink_tile_ctx_t * ctx,
     242           0 :                       int                     flags ) {
     243             : 
     244           0 :   uchar msg[ 16384 ];
     245           0 :   long msg_sz = recvfrom( ctx->nl_monitor->fd, msg, sizeof(msg), flags, NULL, NULL );
     246           0 :   if( msg_sz<=0L ) {
     247           0 :     if( FD_LIKELY( errno==EAGAIN || errno==EINTR ) ) return 0;
     248           0 :     if( errno==ENOBUFS ) {
     249           0 :       fd_netlink_enobufs_cnt++;
     250           0 :       return 0;
     251           0 :     }
     252           0 :     FD_LOG_ERR(( "recvfrom(nl_monitor) failed (%i-%s)", errno, fd_io_strerror( errno ) ));
     253           0 :   }
     254             : 
     255           0 :   struct nlmsghdr * nlh = fd_type_pun( msg );
     256           0 :   FD_DTRACE_PROBE_4( netlink_update, nlh->nlmsg_seq, nlh->nlmsg_type, nlh->nlmsg_len, nlh->nlmsg_flags );
     257           0 :   switch( nlh->nlmsg_type ) {
     258           0 :   case RTM_NEWLINK:
     259           0 :   case RTM_DELLINK:
     260           0 :     ctx->action |= FD_NET_TILE_ACTION_LINK_UPDATE;
     261           0 :     ctx->metrics.update_cnt[ FD_METRICS_ENUM_NETLINK_MSG_V_LINK_IDX ]++;
     262           0 :     break;
     263           0 :   case RTM_NEWROUTE:
     264           0 :   case RTM_DELROUTE:
     265           0 :     ctx->action |= FD_NET_TILE_ACTION_ROUTE4_UPDATE;
     266           0 :     ctx->metrics.update_cnt[ FD_METRICS_ENUM_NETLINK_MSG_V_IPV4_ROUTE_IDX ]++;
     267           0 :     break;
     268           0 :   case RTM_NEWNEIGH:
     269           0 :   case RTM_DELNEIGH: {
     270           0 :     fd_neigh4_netlink_ingest_message( ctx->neigh4, nlh, ctx->neigh4_ifidx );
     271           0 :     ctx->metrics.update_cnt[ FD_METRICS_ENUM_NETLINK_MSG_V_NEIGH_IDX ]++;
     272           0 :     break;
     273           0 :   }
     274           0 :   default:
     275           0 :     FD_LOG_INFO(( "Received unexpected netlink message type %u", nlh->nlmsg_type ));
     276           0 :     break;
     277           0 :   }
     278             : 
     279           0 :   return 1;
     280           0 : }
     281             : 
     282             : static void
     283           0 : during_housekeeping( fd_netlink_tile_ctx_t * ctx ) {
     284           0 :   long now = fd_tickcount();
     285           0 :   if( ctx->action & FD_NET_TILE_ACTION_LINK_UPDATE ) {
     286           0 :     if( now < ctx->link_update_ts ) return;
     287           0 :     ctx->action &= ~FD_NET_TILE_ACTION_LINK_UPDATE;
     288           0 :     fd_netdev_netlink_load_table( ctx->netdev_tbl, ctx->nl_req );
     289           0 :     fd_dbl_buf_insert( ctx->netdev_buf, ctx->netdev_local, ctx->netdev_sz );
     290           0 :     ctx->link_update_ts = now+ctx->update_backoff;
     291           0 :     ctx->metrics.link_full_syncs++;
     292           0 :   }
     293           0 :   if( ctx->action & FD_NET_TILE_ACTION_ROUTE4_UPDATE ) {
     294           0 :     if( now < ctx->route4_update_ts ) return;
     295           0 :     ctx->action &= ~FD_NET_TILE_ACTION_ROUTE4_UPDATE;
     296           0 :     fd_fib4_netlink_load_table( ctx->fib4_local, ctx->nl_req, RT_TABLE_LOCAL );
     297           0 :     fd_fib4_netlink_load_table( ctx->fib4_main,  ctx->nl_req, RT_TABLE_MAIN  );
     298           0 :     ctx->route4_update_ts = now+ctx->update_backoff;
     299           0 :     ctx->metrics.route_full_syncs++;
     300           0 :   }
     301           0 :   if( ctx->action & FD_NET_TILE_ACTION_NEIGH_UPDATE ) {
     302           0 :     ctx->action &= ~FD_NET_TILE_ACTION_NEIGH_UPDATE;
     303           0 :     fd_neigh4_netlink_request_dump( ctx->nl_req, ctx->neigh4_ifidx );
     304           0 :     uchar buf[ 4096 ];
     305           0 :     fd_netlink_iter_t iter[1];
     306           0 :     for( fd_netlink_iter_init( iter, ctx->nl_req, buf, sizeof(buf) );
     307           0 :         !fd_netlink_iter_done( iter );
     308           0 :         fd_netlink_iter_next( iter, ctx->nl_req ) ) {
     309           0 :       fd_neigh4_netlink_ingest_message( ctx->neigh4, fd_netlink_iter_msg( iter ), ctx->neigh4_ifidx );
     310           0 :     }
     311           0 :   }
     312           0 : }
     313             : 
     314             : /* before_credit is called once per loop iteration */
     315             : 
     316             : static void
     317             : before_credit( fd_netlink_tile_ctx_t * ctx,
     318             :                fd_stem_context_t *     stem FD_PARAM_UNUSED,
     319           0 :                int *                   charge_busy ) {
     320             : 
     321           0 :   for(;;) {
     322             :     /* Clear socket buffer */
     323           0 :     if( !netlink_monitor_read( ctx, MSG_DONTWAIT ) ) break;
     324           0 :     *charge_busy = 1;
     325           0 :   }
     326             : 
     327           0 :   ctx->idle_cnt++;
     328           0 :   if( FD_UNLIKELY( ctx->idle_cnt >= 128L ) ) {
     329             :     /* Blocking read (yield to scheduler) */
     330           0 :     *charge_busy = 0;
     331           0 :     netlink_monitor_read( ctx, 0 );
     332           0 :   }
     333             : 
     334           0 : }
     335             : 
     336             : /* after_poll_overrun is called when fd_stem.c was overrun while
     337             :    checking for new fragments.  This typically happens when
     338             :    before_credit takes too long (e.g. we were in a blocking netlink
     339             :    read) */
     340             : 
     341             : static void
     342           0 : after_poll_overrun( fd_netlink_tile_ctx_t * ctx ) {
     343           0 :   ctx->idle_cnt = -1L;
     344           0 : }
     345             : 
     346             : /* after_frag handles a neighbor solicit request */
     347             : 
     348             : static void
     349             : after_frag( fd_netlink_tile_ctx_t * ctx,
     350             :             ulong                   in_idx,
     351             :             ulong                   seq,
     352             :             ulong                   sig,
     353             :             ulong                   sz,
     354             :             ulong                   tsorig,
     355             :             ulong                   tspub,
     356           0 :             fd_stem_context_t *     stem ) {
     357           0 :   (void)in_idx; (void)seq; (void)tsorig; (void)tspub; (void)stem;
     358             : 
     359           0 :   long now = fd_tickcount();
     360           0 :   ctx->idle_cnt = -1L;
     361             : 
     362             :   /* Parse request (fully contained in sig field) */
     363             : 
     364           0 :   if( FD_UNLIKELY( sz!=0UL ) ) {
     365           0 :     FD_LOG_WARNING(( "unexpected sz %lu", sz ));
     366           0 :   }
     367           0 :   if( FD_UNLIKELY( sig>>48 ) ) {
     368           0 :     FD_LOG_WARNING(( "unexpected high bits in sig %016lx", sig ));
     369           0 :   }
     370           0 :   ushort if_idx   = (ushort)(sig>>32);
     371           0 :   uint   ip4_addr = (uint)sig;
     372           0 :   if( FD_UNLIKELY( if_idx!=ctx->neigh4_ifidx ) ) {
     373           0 :     ctx->metrics.neigh_solicits_fails++;
     374           0 :     FD_LOG_ERR(( "received neighbor solicit request for invalid interface index %u", if_idx ));
     375           0 :     return;
     376           0 :   }
     377             : 
     378             :   /* Drop if the kernel is already working on the request */
     379             : 
     380           0 :   fd_neigh4_hmap_query_t query[1];
     381           0 :   int spec_res = fd_neigh4_hmap_query_try( ctx->neigh4, &ip4_addr, NULL, query, 0 );
     382           0 :   if( spec_res==FD_MAP_SUCCESS ) {
     383           0 :     ctx->metrics.neigh_solicits_fails++;
     384           0 :     return;
     385           0 :   }
     386             : 
     387             :   /* Insert placeholder (take above branch next time) */
     388             : 
     389           0 :   int prepare_res = fd_neigh4_hmap_prepare( ctx->neigh4, &ip4_addr, NULL, query, 0 );
     390           0 :   if( FD_UNLIKELY( prepare_res!=FD_MAP_SUCCESS ) ) {
     391           0 :     ctx->metrics.neigh_solicits_fails++;
     392           0 :     return;
     393           0 :   }
     394           0 :   fd_neigh4_entry_t * ele = fd_neigh4_hmap_query_ele( query );
     395           0 :   ele->state    = FD_NEIGH4_STATE_INCOMPLETE;
     396           0 :   ele->ip4_addr = ip4_addr;
     397           0 :   memset( ele->mac_addr, 0, 6UL );
     398           0 :   fd_neigh4_hmap_publish( query );
     399             : 
     400             :   /* Trigger neighbor solicit via netlink */
     401             : 
     402           0 :   int probe_res = fd_neigh4_probe_rate_limited( ctx->prober, ele, ip4_addr, now );
     403           0 :   if( probe_res==0 ) {
     404           0 :     ctx->metrics.neigh_solicits_sent++;
     405           0 :   } else if( probe_res>0 ) {
     406           0 :     ctx->metrics.neigh_solicits_fails++;
     407           0 :   }
     408             : 
     409           0 : }
     410             : 
     411           0 : #define STEM_BURST (1UL)
     412           0 : #define STEM_LAZY ((ulong)13e6) /* 13ms */
     413             : 
     414           0 : #define STEM_CALLBACK_CONTEXT_TYPE  fd_netlink_tile_ctx_t
     415           0 : #define STEM_CALLBACK_CONTEXT_ALIGN alignof(fd_netlink_tile_ctx_t)
     416             : 
     417           0 : #define STEM_CALLBACK_METRICS_WRITE       metrics_write
     418           0 : #define STEM_CALLBACK_DURING_HOUSEKEEPING during_housekeeping
     419           0 : #define STEM_CALLBACK_BEFORE_CREDIT       before_credit
     420           0 : #define STEM_CALLBACK_AFTER_POLL_OVERRUN  after_poll_overrun
     421           0 : #define STEM_CALLBACK_AFTER_FRAG          after_frag
     422             : 
     423             : #include "../stem/fd_stem.c"
     424             : 
     425             : /* End stem methods */
     426             : 
     427             : fd_topo_run_tile_t fd_tile_netlnk = {
     428             :   .name                     = "netlnk",
     429             :   .populate_allowed_seccomp = populate_allowed_seccomp,
     430             :   .populate_allowed_fds     = populate_allowed_fds,
     431             :   .scratch_align            = scratch_align,
     432             :   .scratch_footprint        = scratch_footprint,
     433             :   .privileged_init          = privileged_init,
     434             :   .unprivileged_init        = unprivileged_init,
     435             :   .run                      = stem_run
     436             : };

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