diff options
Diffstat (limited to 'zebra/zebra_netns_id.c')
| -rw-r--r-- | zebra/zebra_netns_id.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/zebra/zebra_netns_id.c b/zebra/zebra_netns_id.c index 77a9a7c368..eca0961b99 100644 --- a/zebra/zebra_netns_id.c +++ b/zebra/zebra_netns_id.c @@ -314,11 +314,101 @@ ns_id_t zebra_ns_id_get(const char *netnspath) return return_nsid; } +/* if nsid is not default one, get relative default ns for the new ns + * for instance, if default ns is 0 and a new ns "vrf1" id is 1, + * in ns "vrf1", the default ns is not known. using GETNSID with + * two parameters: NETNS_NSID, and NETNS_TARGET_NSID will help + * in identifying that value + */ +ns_id_t zebra_ns_id_get_relative_value(ns_id_t ns_read, ns_id_t target_nsid) +{ + struct sockaddr_nl snl; + int sock, ret; + unsigned int seq; + ns_id_t return_nsid = NS_UNKNOWN; + char buf[NETLINK_SOCKET_BUFFER_SIZE]; + struct nlmsghdr *nlh; + struct rtgenmsg *rt; + int len; + + if (ns_read == NS_UNKNOWN || target_nsid == NS_UNKNOWN) + return return_nsid; + + /* netlink socket */ + sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); + if (sock < 0) { + flog_err_sys(EC_LIB_SOCKET, "netlink( %u) socket() error: %s", + sock, safe_strerror(errno)); + return NS_UNKNOWN; + } + memset(&snl, 0, sizeof(snl)); + snl.nl_family = AF_NETLINK; + snl.nl_groups = RTNLGRP_NSID; + snl.nl_pid = 0; /* AUTO PID */ + ret = bind(sock, (struct sockaddr *)&snl, sizeof(snl)); + if (ret < 0) { + flog_err_sys(EC_LIB_SOCKET, + "netlink( %u) socket() bind error: %s", sock, + safe_strerror(errno)); + close(sock); + return NS_UNKNOWN; + } + + /* message to send to netlink : GETNSID */ + memset(buf, 0, NETLINK_SOCKET_BUFFER_SIZE); + nlh = initiate_nlh(buf, &seq, RTM_GETNSID); + rt = (struct rtgenmsg *)(buf + nlh->nlmsg_len); + nlh->nlmsg_len += NETLINK_ALIGN(sizeof(struct rtgenmsg)); + rt->rtgen_family = AF_UNSPEC; + + addattr32(nlh, NETLINK_SOCKET_BUFFER_SIZE, NETNSA_NSID, ns_read); + addattr32(nlh, NETLINK_SOCKET_BUFFER_SIZE, NETNSA_TARGET_NSID, target_nsid); + + ret = send_receive(sock, nlh, seq, buf); + if (ret < 0) { + close(sock); + return NS_UNKNOWN; + } + nlh = (struct nlmsghdr *)buf; + len = ret; + ret = 0; + do { + if (nlh->nlmsg_type >= NLMSG_MIN_TYPE) { + return_nsid = extract_nsid(nlh, buf); + if (return_nsid != NS_UNKNOWN) + break; + } else if (nlh->nlmsg_type == NLMSG_ERROR) { + struct nlmsgerr *err = + (struct nlmsgerr + *)((char *)nlh + + NETLINK_ALIGN(sizeof( + struct + nlmsghdr))); + if (err->error < 0) + errno = -err->error; + else + errno = err->error; + break; + } + len = len - NETLINK_ALIGN(nlh->nlmsg_len); + nlh = (struct nlmsghdr *)((char *)nlh + + NETLINK_ALIGN( + nlh->nlmsg_len)); + } while (len != 0 && ret == 0); + + return return_nsid; +} + #else ns_id_t zebra_ns_id_get(const char *netnspath) { return zebra_ns_id_get_fallback(netnspath); } + +ns_id_t zebra_ns_id_get_relative_value(ns_id_t ns_read, ns_id_t target_nsid) +{ + return NS_UNKNOWN; +} #endif /* ! defined(HAVE_NETLINK) */ #ifdef HAVE_NETNS |