diff options
Diffstat (limited to 'sysdep')
| -rw-r--r-- | sysdep/linux/netlink.c | 66 |
1 files changed, 36 insertions, 30 deletions
diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c index 6cf40484..7b1f2dda 100644 --- a/sysdep/linux/netlink.c +++ b/sysdep/linux/netlink.c @@ -6,6 +6,7 @@ * Can be freely distributed and used under the terms of the GNU GPL. */ +#include <alloca.h> #include <stdio.h> #include <unistd.h> #include <fcntl.h> @@ -915,44 +916,49 @@ nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int new) eattr *ea; net *net = e->net; rta *a = e->attrs; + int bufsize = 128 + KRT_METRICS_MAX*8 + nh_bufsize(a->nexthops); + struct { struct nlmsghdr h; struct rtmsg r; - char buf[128 + KRT_METRICS_MAX*8 + nh_bufsize(a->nexthops)]; - } r; + char buf[0]; + } *r; + + int rsize = sizeof(*r) + bufsize; + r = alloca(rsize); DBG("nl_send_route(%N,new=%d)\n", net->n.addr, new); - bzero(&r.h, sizeof(r.h)); - bzero(&r.r, sizeof(r.r)); - r.h.nlmsg_type = new ? RTM_NEWROUTE : RTM_DELROUTE; - r.h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); - r.h.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | (new ? NLM_F_CREATE|NLM_F_EXCL : 0); + bzero(&r->h, sizeof(r->h)); + bzero(&r->r, sizeof(r->r)); + r->h.nlmsg_type = new ? RTM_NEWROUTE : RTM_DELROUTE; + r->h.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); + r->h.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | (new ? NLM_F_CREATE|NLM_F_EXCL : 0); - r.r.rtm_family = p->af; - r.r.rtm_dst_len = net_pxlen(net->n.addr); - r.r.rtm_protocol = RTPROT_BIRD; - r.r.rtm_scope = RT_SCOPE_UNIVERSE; - nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net_prefix(net->n.addr)); + r->r.rtm_family = p->af; + r->r.rtm_dst_len = net_pxlen(net->n.addr); + r->r.rtm_protocol = RTPROT_BIRD; + r->r.rtm_scope = RT_SCOPE_UNIVERSE; + nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(net->n.addr)); if (krt_table_id(p) < 256) - r.r.rtm_table = krt_table_id(p); + r->r.rtm_table = krt_table_id(p); else - nl_add_attr_u32(&r.h, sizeof(r), RTA_TABLE, krt_table_id(p)); + nl_add_attr_u32(&r->h, rsize, RTA_TABLE, krt_table_id(p)); /* For route delete, we do not specify route attributes */ if (!new) - return nl_exchange(&r.h); + return nl_exchange(&r->h); if (ea = ea_find(eattrs, EA_KRT_METRIC)) - nl_add_attr_u32(&r.h, sizeof(r), RTA_PRIORITY, ea->u.data); + nl_add_attr_u32(&r->h, rsize, RTA_PRIORITY, ea->u.data); if (ea = ea_find(eattrs, EA_KRT_PREFSRC)) - nl_add_attr_ipa(&r.h, sizeof(r), RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data); + nl_add_attr_ipa(&r->h, rsize, RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data); if (ea = ea_find(eattrs, EA_KRT_REALM)) - nl_add_attr_u32(&r.h, sizeof(r), RTA_FLOW, ea->u.data); + nl_add_attr_u32(&r->h, rsize, RTA_FLOW, ea->u.data); u32 metrics[KRT_METRICS_MAX]; @@ -967,7 +973,7 @@ nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int new) } if (metrics[0]) - nl_add_metrics(&r.h, sizeof(r), metrics, KRT_METRICS_MAX); + nl_add_metrics(&r->h, rsize, metrics, KRT_METRICS_MAX); /* a->iface != NULL checked in krt_capable() for router and device routes */ @@ -975,32 +981,32 @@ nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int new) switch (a->dest) { case RTD_ROUTER: - r.r.rtm_type = RTN_UNICAST; - nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index); - nl_add_attr_ipa(&r.h, sizeof(r), RTA_GATEWAY, a->gw); + r->r.rtm_type = RTN_UNICAST; + nl_add_attr_u32(&r->h, rsize, RTA_OIF, a->iface->index); + nl_add_attr_ipa(&r->h, rsize, RTA_GATEWAY, a->gw); break; case RTD_DEVICE: - r.r.rtm_type = RTN_UNICAST; - nl_add_attr_u32(&r.h, sizeof(r), RTA_OIF, a->iface->index); + r->r.rtm_type = RTN_UNICAST; + nl_add_attr_u32(&r->h, rsize, RTA_OIF, a->iface->index); break; case RTD_BLACKHOLE: - r.r.rtm_type = RTN_BLACKHOLE; + r->r.rtm_type = RTN_BLACKHOLE; break; case RTD_UNREACHABLE: - r.r.rtm_type = RTN_UNREACHABLE; + r->r.rtm_type = RTN_UNREACHABLE; break; case RTD_PROHIBIT: - r.r.rtm_type = RTN_PROHIBIT; + r->r.rtm_type = RTN_PROHIBIT; break; case RTD_MULTIPATH: - r.r.rtm_type = RTN_UNICAST; - nl_add_multipath(&r.h, sizeof(r), a->nexthops); + r->r.rtm_type = RTN_UNICAST; + nl_add_multipath(&r->h, rsize, a->nexthops); break; default: bug("krt_capable inconsistent with nl_send_route"); } - return nl_exchange(&r.h); + return nl_exchange(&r->h); } void |