forked from Mirror/frr
bfdd: implement functions for sending sbfd pkts with SRv6 header
Two types of sbfd packets are supported: initiator packet and echo packet Signed-off-by: wumu.zsl <wumu.zsl@alibaba-inc.com>
This commit is contained in:
wumu.zsl
parent
5107e273d0
commit
e6a531d092
15
bfdd/bfd.h
15
bfdd/bfd.h
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@ -199,6 +199,8 @@ struct bfd_echo_pkt {
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#define BFD_ECHO_VERSION 1
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#define BFD_ECHO_PKT_LEN sizeof(struct bfd_echo_pkt)
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#define RTH_BASE_HEADER_LEN 8
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#define GET_RTH_HDR_LEN(size) (((size) >> 3) - 1)
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enum bfd_diagnosticis {
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BD_OK = 0,
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/* Control Detection Time Expired. */
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@ -276,6 +278,7 @@ struct bfd_session_stats {
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uint64_t session_up;
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uint64_t session_down;
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uint64_t znotification;
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uint64_t tx_fail_pkt;
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};
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/**
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@ -390,6 +393,9 @@ struct bfd_session {
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char bfd_name[BFD_NAME_SIZE + 1];
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uint32_t bfd_mode;
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uint8_t segnum;
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struct in6_addr out_sip6;
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struct in6_addr seg_list[SRV6_MAX_SEGS];
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};
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struct bfd_diag_str_list {
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@ -433,6 +439,7 @@ struct sbfd_reflector {
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#define BFD_DEF_DES_MIN_ECHO_TX (50 * 1000) /* microseconds. */
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#define BFD_DEF_REQ_MIN_ECHO_RX (50 * 1000) /* microseconds. */
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#define BFD_DEF_SLOWTX (1000 * 1000) /* microseconds. */
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#define SBFD_ECHO_DEF_SLOWTX (1000 * 1000) /* microseconds. */
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/** Minimum multi hop TTL. */
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#define BFD_DEF_MHOP_TTL 254
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#define BFD_PKT_LEN 24 /* Length of control packet */
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@ -447,7 +454,9 @@ struct sbfd_reflector {
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#define BFD_DEFDESTPORT 3784
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#define BFD_DEF_ECHO_PORT 3785
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#define BFD_DEF_MHOP_DEST_PORT 4784
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#define BFD_DEF_SBFD_DEST_PORT 7784
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#define BFD_SBFD_INITIATOR_DEMAND 1
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/*
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* bfdd.c
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@ -539,6 +548,7 @@ int bp_set_ttl(int sd, uint8_t value);
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int bp_set_tosv6(int sd, uint8_t value);
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int bp_set_tos(int sd, uint8_t value);
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int bp_bind_dev(int sd, const char *dev);
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void bp_set_prio(int sd, int value);
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int bp_udp_shop(const struct vrf *vrf);
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int bp_udp_mhop(const struct vrf *vrf);
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@ -548,10 +558,15 @@ int bp_peer_socket(const struct bfd_session *bs);
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int bp_peer_socketv6(const struct bfd_session *bs);
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int bp_echo_socket(const struct vrf *vrf);
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int bp_echov6_socket(const struct vrf *vrf);
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int bp_peer_srh_socketv6(struct bfd_session *bs);
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int bp_sbfd_socket(const struct vrf *vrf);
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int bp_initv6_socket(const struct vrf *vrf);
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void ptm_bfd_snd(struct bfd_session *bfd, int fbit);
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void ptm_bfd_echo_snd(struct bfd_session *bfd);
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void ptm_bfd_echo_fp_snd(struct bfd_session *bfd);
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void ptm_sbfd_echo_snd(struct bfd_session *bfd);
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void ptm_sbfd_initiator_snd(struct bfd_session *bfd, int fbit);
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void bfd_recv_cb(struct event *t);
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@ -16,6 +16,8 @@
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#ifdef GNU_LINUX
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#include <linux/filter.h>
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#include <linux/seg6.h>
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#include <linux/ipv6.h>
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#endif
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#ifdef BFD_LINUX
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@ -24,12 +26,16 @@
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#include <netinet/if_ether.h>
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#include <netinet/udp.h>
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#include <netinet/ip6.h>
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#include <ifaddrs.h>
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#include "lib/sockopt.h"
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#include "lib/checksum.h"
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#include "lib/network.h"
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#include "bfd.h"
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#define BUF_SIZ 1024
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#define SOCK_OPT_PRIO_HIGH 6
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/*
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* Prototypes
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@ -49,7 +55,14 @@ int bp_udp_send(int sd, uint8_t ttl, uint8_t *data, size_t datalen,
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struct sockaddr *to, socklen_t tolen);
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int bp_bfd_echo_in(struct bfd_vrf_global *bvrf, int sd, uint8_t *ttl,
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uint32_t *my_discr, uint64_t *my_rtt);
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static int ptm_bfd_reflector_process_init_packet(struct bfd_vrf_global *bvrf, int s);
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int _ptm_sbfd_init_send(struct bfd_session *bs, const void *data, size_t datalen);
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#ifdef BFD_LINUX
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static int bp_raw_sbfd_red_send(int sd, uint8_t *data, size_t datalen, uint16_t family,
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struct in6_addr *out_sip, struct in6_addr *sip,
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struct in6_addr *dip, uint16_t src_port, uint16_t dst_port,
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uint8_t seg_num, struct in6_addr *segment_list);
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ssize_t bfd_recv_ipv4_fp(int sd, uint8_t *msgbuf, size_t msgbuflen,
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uint8_t *ttl, ifindex_t *ifindex,
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struct sockaddr_any *local, struct sockaddr_any *peer);
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@ -1352,6 +1365,16 @@ static void bp_bind_ip(int sd, uint16_t port)
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zlog_fatal("bind-ip: bind: %s", strerror(errno));
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}
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void bp_set_prio(int sd, int value)
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{
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#if defined(GNU_LINUX)
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int priority = value;
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if (setsockopt(sd, SOL_SOCKET, SO_PRIORITY, &priority, sizeof(priority)) < 0)
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zlog_warn("set_prio: setsockopt(SO_PRIORITY, %d): %s", value, strerror(errno));
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#endif
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}
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int bp_udp_shop(const struct vrf *vrf)
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{
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int sd;
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@ -1421,6 +1444,8 @@ int bp_peer_socket(const struct bfd_session *bs)
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return -1;
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}
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bp_set_prio(sd, SOCK_OPT_PRIO_HIGH);
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/* Find an available source port in the proper range */
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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@ -1487,6 +1512,8 @@ int bp_peer_socketv6(const struct bfd_session *bs)
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return -1;
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}
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bp_set_prio(sd, SOCK_OPT_PRIO_HIGH);
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/* Find an available source port in the proper range */
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memset(&sin6, 0, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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@ -1768,3 +1795,725 @@ void bfd_peer_mac_set(int sd, struct bfd_session *bfd,
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}
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}
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#endif
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int _ptm_sbfd_init_send(struct bfd_session *bfd, const void *data, size_t datalen)
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{
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#ifdef BFD_LINUX
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int sd = -1;
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struct bfd_vrf_global *bvrf = bfd_vrf_look_by_session(bfd);
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int seg_num;
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struct in6_addr *segment_list = NULL;
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struct in6_addr peer;
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struct in6_addr local;
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if (!bvrf)
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return -1;
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seg_num = bfd->segnum;
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if (seg_num > 0)
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segment_list = bfd->seg_list;
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sd = bfd->sock;
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local = bfd->key.local;
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peer = bfd->key.peer;
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/*SBFD Control pkt dst port should be 7784, src port can be any but NOT 7784 according to RFC7881 */
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if (bp_raw_sbfd_red_send(sd, (uint8_t *)data, datalen, bfd->key.family, &bfd->out_sip6,
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&local, &peer,
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CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_MH) ? BFD_DEF_MHOP_DEST_PORT
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: BFD_DEFDESTPORT,
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BFD_DEF_SBFD_DEST_PORT, seg_num, segment_list) < 0) {
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if (bfd->stats.tx_fail_pkt <= 1) {
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char dst[INET6_ADDRSTRLEN] = { 0 };
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inet_ntop(AF_INET6, seg_num > 0 ? segment_list : (&bfd->key.peer), dst,
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sizeof(dst));
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zlog_err("sbfd initiator send failed, dst:%s, errno:%s", dst,
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safe_strerror(errno));
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}
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bfd->stats.tx_fail_pkt++;
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return -1;
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}
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if (bfd->stats.tx_fail_pkt > 0) {
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char dst[INET6_ADDRSTRLEN] = { 0 };
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inet_ntop(AF_INET6, seg_num > 0 ? segment_list : (&bfd->key.peer), dst, sizeof(dst));
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zlog_warn("sbfd initiator send success, dst:%s, previous tx_fail_pkt:%d", dst,
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(int)bfd->stats.tx_fail_pkt);
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}
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bfd->stats.tx_fail_pkt = 0;
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bfd->stats.tx_ctrl_pkt++;
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#endif
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return 0;
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}
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static int _ptm_sbfd_echo_send(struct bfd_session *bfd, const void *data, size_t datalen)
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{
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#ifdef BFD_LINUX
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int sd = -1;
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struct bfd_vrf_global *bvrf = bfd_vrf_look_by_session(bfd);
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int seg_num;
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struct in6_addr *segment_list = NULL;
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struct in6_addr peer;
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struct in6_addr local;
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if (!bvrf)
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return -1;
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seg_num = bfd->segnum;
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if (seg_num > 0)
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segment_list = bfd->seg_list;
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sd = bfd->sock;
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local = bfd->key.local;
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peer = bfd->key.peer;
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/*SBFD echo pkt dst port should use BFD Echo port 3785, src port can be any according to RFC7881*/
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if (bp_raw_sbfd_red_send(sd, (uint8_t *)data, datalen, bfd->key.family, &bfd->out_sip6,
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&local, &peer, BFD_DEF_ECHO_PORT, BFD_DEF_ECHO_PORT, seg_num,
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segment_list) < 0) {
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if (bfd->stats.tx_fail_pkt <= 1) {
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char dst[INET6_ADDRSTRLEN] = { 0 };
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inet_ntop(AF_INET6, seg_num > 0 ? segment_list : (&bfd->key.peer), dst,
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sizeof(dst));
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zlog_err("sbfd echo send failed, bfd_name:%s, dst:%s, errno:%s",
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bfd->bfd_name, dst, safe_strerror(errno));
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}
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bfd->stats.tx_fail_pkt++;
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return -1;
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}
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if (bfd->stats.tx_fail_pkt > 0) {
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char dst[INET6_ADDRSTRLEN] = { 0 };
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inet_ntop(AF_INET6, seg_num > 0 ? segment_list : (&bfd->key.peer), dst, sizeof(dst));
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zlog_warn("sbfd echo send success, bfd_name:%s, dst:%s, previous tx_fail_pkt:%d",
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bfd->bfd_name, dst, (int)bfd->stats.tx_fail_pkt);
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}
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bfd->stats.tx_fail_pkt = 0;
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bfd->stats.tx_echo_pkt++;
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#endif
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return 0;
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}
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void ptm_sbfd_initiator_snd(struct bfd_session *bfd, int fbit)
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{
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struct bfd_pkt cp = {};
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/* Set fields according to section 6.5.7 */
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cp.diag = bfd->local_diag;
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BFD_SETVER(cp.diag, BFD_VERSION);
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cp.flags = 0;
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BFD_SETSTATE(cp.flags, bfd->ses_state);
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if (CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_CBIT))
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BFD_SETCBIT(cp.flags, BFD_CBIT);
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BFD_SETDEMANDBIT(cp.flags, BFD_SBFD_INITIATOR_DEMAND);
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/*
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* Polling and Final can't be set at the same time.
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*
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* RFC 5880, Section 6.5.
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*/
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BFD_SETFBIT(cp.flags, fbit);
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if (fbit == 0)
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BFD_SETPBIT(cp.flags, bfd->polling);
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cp.detect_mult = bfd->detect_mult;
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cp.len = BFD_PKT_LEN;
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cp.discrs.my_discr = htonl(bfd->discrs.my_discr);
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cp.discrs.remote_discr = htonl(bfd->discrs.remote_discr);
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if (bfd->polling) {
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cp.timers.desired_min_tx = htonl(bfd->timers.desired_min_tx);
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} else {
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/*
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* We can only announce current setting on poll, this
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* avoids timing mismatch with our peer and give it
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* the oportunity to learn. See `bs_final_handler` for
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* more information.
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*/
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cp.timers.desired_min_tx = htonl(bfd->cur_timers.desired_min_tx);
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}
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cp.timers.required_min_rx = 0;
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cp.timers.required_min_echo = 0;
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if (_ptm_sbfd_init_send(bfd, &cp, BFD_PKT_LEN) != 0)
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return;
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bfd->stats.tx_ctrl_pkt++;
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}
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void ptm_sbfd_echo_snd(struct bfd_session *bfd)
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{
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struct bfd_echo_pkt bep;
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memset(&bep, 0, sizeof(bep));
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BFD_SETVER(bep.ver, BFD_ECHO_VERSION);
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bep.len = BFD_ECHO_PKT_LEN;
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bep.my_discr = htonl(bfd->discrs.my_discr);
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if (_ptm_sbfd_echo_send(bfd, &bep, BFD_ECHO_PKT_LEN) != 0)
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return;
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if (!CHECK_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE))
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SET_FLAG(bfd->flags, BFD_SESS_FLAG_ECHO_ACTIVE);
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}
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static int ptm_bfd_reflector_process_init_packet(struct bfd_vrf_global *bvrf, int sd)
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{
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//uint32_t my_discr = 0;
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//uint32_t remote_discr = 0;
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uint8_t ttl = 0;
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struct sockaddr *sa;
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struct sbfd_reflector *sr;
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/* Receive and parse echo packet. */
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struct bfd_pkt *cp;
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ssize_t rlen;
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struct sockaddr_any local, peer;
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ifindex_t ifindex = IFINDEX_INTERNAL;
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//vrf_id_t vrfid = VRF_DEFAULT;
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uint8_t msgbuf[1516];
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rlen = bfd_recv_ipv6(sd, msgbuf, sizeof(msgbuf), &ttl, &ifindex, &local, &peer);
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/* Short packet, better not risk reading it. */
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if (rlen < (ssize_t)sizeof(*cp)) {
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zlog_debug("small bfd packet");
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return 0;
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}
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cp = (struct bfd_pkt *)(msgbuf);
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if (!CHECK_FLAG(cp->flags, BFD_DEMANDBIT)) {
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/*Control Packet from SBFDInitiator should have Demand bit set to 1 according to RFC7880*/
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return 0;
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}
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sr = sbfd_discr_lookup(ntohl(cp->discrs.remote_discr));
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if (sr) {
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uint32_t temp = cp->discrs.my_discr;
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cp->discrs.my_discr = cp->discrs.remote_discr;
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cp->discrs.remote_discr = temp;
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UNSET_FLAG(cp->flags, BFD_DEMANDBIT);
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BFD_SETSTATE(cp->flags, PTM_BFD_UP);
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if (CHECK_FLAG(cp->flags, BFD_PBIT)) {
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UNSET_FLAG(cp->flags, BFD_PBIT);
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SET_FLAG(cp->flags, BFD_FBIT);
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}
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sa = (struct sockaddr *)&peer.sa_sin6;
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if (sendto(sd, msgbuf, rlen, 0, sa, sizeof(peer.sa_sin6)) <= 0) {
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zlog_debug("packet-send: send failure: %s", strerror(errno));
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return -1;
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}
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} else {
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zlog_debug("no reflector found in %u", cp->discrs.remote_discr);
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}
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return 0;
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}
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int bp_peer_srh_socketv6(struct bfd_session *bs)
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{
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int sd; //, pcount;
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//struct sockaddr_in6 sin6;
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//static int srcPort = BFD_SRCPORTINIT;
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const char *device_to_bind = NULL;
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if (bs->key.ifname[0]) {
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device_to_bind = (const char *)bs->key.ifname;
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zlog_debug("device_to_bind to ifname:%s", device_to_bind);
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} else if (CHECK_FLAG(bs->flags, BFD_SESS_FLAG_MH) && bs->key.vrfname[0]) {
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device_to_bind = (const char *)bs->key.vrfname;
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zlog_debug("device_to_bind to vrf:%s", device_to_bind);
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} else {
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zlog_debug("device_to_bind to NULL");
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}
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frr_with_privs (&bglobal.bfdd_privs) {
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sd = vrf_socket(AF_INET6, SOCK_RAW, IPPROTO_RAW, bs->vrf->vrf_id, device_to_bind);
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}
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if (sd == -1) {
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zlog_err("ipv6-new: failed to create socket: %s", strerror(errno));
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return -1;
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}
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/* Set TTL to 255 for all transmitted packets */
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if (bp_set_ttlv6(sd, BFD_TTL_VAL) != 0) {
|
||||
close(sd);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Set TOS to CS6 for all transmitted packets */
|
||||
if (bp_set_tosv6(sd, BFD_TOS_VAL) != 0) {
|
||||
close(sd);
|
||||
return -1;
|
||||
}
|
||||
#if defined(HAVE_IPV6_HDRINCL)
|
||||
int on = 1;
|
||||
|
||||
/*manage the IP6 header all on own onwn*/
|
||||
if (setsockopt(sd, IPPROTO_IPV6, IPV6_HDRINCL, &on, sizeof(on))) {
|
||||
zlog_err("setsockopt IPV6_HDRINCL error: %s", strerror(errno));
|
||||
close(sd);
|
||||
return -1;
|
||||
}
|
||||
#endif
|
||||
|
||||
return sd;
|
||||
}
|
||||
|
||||
int bp_initv6_socket(const struct vrf *vrf)
|
||||
{
|
||||
int sd;
|
||||
|
||||
frr_with_privs (&bglobal.bfdd_privs) {
|
||||
sd = vrf_socket(AF_INET6, SOCK_DGRAM, 0, vrf->vrf_id, vrf->name);
|
||||
}
|
||||
if (sd == -1) {
|
||||
if (errno != EAFNOSUPPORT)
|
||||
zlog_fatal("echov6-socket: socket: %s", strerror(errno));
|
||||
else
|
||||
zlog_warn("echov6-socket: V6 is not supported, continuing");
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
bp_set_ipv6opts(sd);
|
||||
bp_bind_ipv6(sd, BFD_DEF_SBFD_DEST_PORT);
|
||||
|
||||
return sd;
|
||||
}
|
||||
|
||||
#ifdef BFD_LINUX
|
||||
static uint16_t checksum(uint16_t *addr, int len)
|
||||
{
|
||||
int count = len;
|
||||
uint16_t answer = 0;
|
||||
|
||||
register uint32_t sum = 0;
|
||||
|
||||
// Sum up 2-byte values until none or only one byte left.
|
||||
while (count > 1) {
|
||||
sum += *(addr++);
|
||||
count -= 2;
|
||||
}
|
||||
|
||||
// Add left-over byte, if any.
|
||||
if (count > 0)
|
||||
sum += *(uint8_t *)addr;
|
||||
|
||||
// Fold 32-bit sum into 16 bits; we lose information by doing this,
|
||||
// increasing the chances of a collision.
|
||||
// sum = (lower 16 bits) + (upper 16 bits shifted right 16 bits)
|
||||
while (sum >> 16)
|
||||
sum = (sum & 0xffff) + (sum >> 16);
|
||||
|
||||
// Checksum is one's compliment of sum.
|
||||
answer = ~sum;
|
||||
|
||||
return answer;
|
||||
}
|
||||
|
||||
static uint16_t udp6_checksum(struct ip6_hdr iphdr, struct udphdr udp_hdr, uint8_t *payload,
|
||||
int payloadlen)
|
||||
{
|
||||
char buf[IP_MAXPACKET];
|
||||
char *ptr;
|
||||
int chksumlen = 0;
|
||||
int i;
|
||||
|
||||
ptr = &buf[0]; // ptr points to beginning of buffer buf
|
||||
|
||||
// Copy source IP address into buf (128 bits)
|
||||
memcpy(ptr, &iphdr.ip6_src.s6_addr, sizeof(iphdr.ip6_src.s6_addr));
|
||||
ptr += sizeof(iphdr.ip6_src.s6_addr);
|
||||
chksumlen += sizeof(iphdr.ip6_src.s6_addr);
|
||||
|
||||
// Copy destination IP address into buf (128 bits)
|
||||
memcpy(ptr, &iphdr.ip6_dst.s6_addr, sizeof(iphdr.ip6_dst.s6_addr));
|
||||
ptr += sizeof(iphdr.ip6_dst.s6_addr);
|
||||
chksumlen += sizeof(iphdr.ip6_dst.s6_addr);
|
||||
|
||||
// Copy UDP length into buf (32 bits)
|
||||
memcpy(ptr, &udp_hdr.len, sizeof(udp_hdr.len));
|
||||
ptr += sizeof(udp_hdr.len);
|
||||
chksumlen += sizeof(udp_hdr.len);
|
||||
|
||||
// Copy zero field to buf (24 bits)
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
chksumlen += 3;
|
||||
|
||||
// Copy next header field to buf (8 bits)
|
||||
memcpy(ptr, &iphdr.ip6_nxt, sizeof(iphdr.ip6_nxt));
|
||||
ptr += sizeof(iphdr.ip6_nxt);
|
||||
chksumlen += sizeof(iphdr.ip6_nxt);
|
||||
|
||||
// Copy UDP source port to buf (16 bits)
|
||||
memcpy(ptr, &udp_hdr.source, sizeof(udp_hdr.source));
|
||||
ptr += sizeof(udp_hdr.source);
|
||||
chksumlen += sizeof(udp_hdr.source);
|
||||
|
||||
// Copy UDP destination port to buf (16 bits)
|
||||
memcpy(ptr, &udp_hdr.dest, sizeof(udp_hdr.dest));
|
||||
ptr += sizeof(udp_hdr.dest);
|
||||
chksumlen += sizeof(udp_hdr.dest);
|
||||
|
||||
// Copy UDP length again to buf (16 bits)
|
||||
memcpy(ptr, &udp_hdr.len, sizeof(udp_hdr.len));
|
||||
ptr += sizeof(udp_hdr.len);
|
||||
chksumlen += sizeof(udp_hdr.len);
|
||||
|
||||
// Copy UDP checksum to buf (16 bits)
|
||||
// Zero, since we don't know it yet
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
chksumlen += 2;
|
||||
|
||||
// Copy payload to buf
|
||||
memcpy(ptr, payload, payloadlen * sizeof(uint8_t));
|
||||
ptr += payloadlen;
|
||||
chksumlen += payloadlen;
|
||||
|
||||
// Pad to the next 16-bit boundary
|
||||
for (i = 0; i < payloadlen % 2; i++, ptr++) {
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
chksumlen++;
|
||||
}
|
||||
|
||||
return checksum((uint16_t *)buf, chksumlen);
|
||||
}
|
||||
|
||||
// Build IPv4 UDP pseudo-header and call checksum function.
|
||||
static uint16_t udp4_checksum(struct ip iphdr, struct udphdr udp_hdr, uint8_t *payload,
|
||||
int payloadlen)
|
||||
{
|
||||
char buf[IP_MAXPACKET];
|
||||
char *ptr;
|
||||
int chksumlen = 0;
|
||||
int i;
|
||||
|
||||
ptr = &buf[0]; // ptr points to beginning of buffer buf
|
||||
|
||||
// Copy source IP address into buf (32 bits)
|
||||
memcpy(ptr, &iphdr.ip_src.s_addr, sizeof(iphdr.ip_src.s_addr));
|
||||
ptr += sizeof(iphdr.ip_src.s_addr);
|
||||
chksumlen += sizeof(iphdr.ip_src.s_addr);
|
||||
|
||||
// Copy destination IP address into buf (32 bits)
|
||||
memcpy(ptr, &iphdr.ip_dst.s_addr, sizeof(iphdr.ip_dst.s_addr));
|
||||
ptr += sizeof(iphdr.ip_dst.s_addr);
|
||||
chksumlen += sizeof(iphdr.ip_dst.s_addr);
|
||||
|
||||
// Copy zero field to buf (8 bits)
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
chksumlen += 1;
|
||||
|
||||
// Copy transport layer protocol to buf (8 bits)
|
||||
memcpy(ptr, &iphdr.ip_p, sizeof(iphdr.ip_p));
|
||||
ptr += sizeof(iphdr.ip_p);
|
||||
chksumlen += sizeof(iphdr.ip_p);
|
||||
|
||||
// Copy UDP length to buf (16 bits)
|
||||
memcpy(ptr, &udp_hdr.len, sizeof(udp_hdr.len));
|
||||
ptr += sizeof(udp_hdr.len);
|
||||
chksumlen += sizeof(udp_hdr.len);
|
||||
|
||||
// Copy UDP source port to buf (16 bits)
|
||||
memcpy(ptr, &udp_hdr.source, sizeof(udp_hdr.source));
|
||||
ptr += sizeof(udp_hdr.source);
|
||||
chksumlen += sizeof(udp_hdr.source);
|
||||
|
||||
// Copy UDP destination port to buf (16 bits)
|
||||
memcpy(ptr, &udp_hdr.dest, sizeof(udp_hdr.dest));
|
||||
ptr += sizeof(udp_hdr.dest);
|
||||
chksumlen += sizeof(udp_hdr.dest);
|
||||
|
||||
// Copy UDP length again to buf (16 bits)
|
||||
memcpy(ptr, &udp_hdr.len, sizeof(udp_hdr.len));
|
||||
ptr += sizeof(udp_hdr.len);
|
||||
chksumlen += sizeof(udp_hdr.len);
|
||||
|
||||
// Copy UDP checksum to buf (16 bits)
|
||||
// Zero, since we don't know it yet
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
chksumlen += 2;
|
||||
|
||||
// Copy payload to buf
|
||||
memcpy(ptr, payload, payloadlen);
|
||||
ptr += payloadlen;
|
||||
chksumlen += payloadlen;
|
||||
|
||||
// Pad to the next 16-bit boundary
|
||||
for (i = 0; i < payloadlen % 2; i++, ptr++) {
|
||||
*ptr = 0;
|
||||
ptr++;
|
||||
chksumlen++;
|
||||
}
|
||||
|
||||
return checksum((uint16_t *)buf, chksumlen);
|
||||
}
|
||||
#endif
|
||||
|
||||
int bp_sbfd_socket(const struct vrf *vrf)
|
||||
{
|
||||
int s;
|
||||
|
||||
frr_with_privs (&bglobal.bfdd_privs) {
|
||||
s = vrf_socket(AF_INET6, SOCK_RAW, IPPROTO_RAW, vrf->vrf_id, vrf->name);
|
||||
}
|
||||
if (s == -1) {
|
||||
if (errno != EAFNOSUPPORT)
|
||||
zlog_fatal("sbfdv6-socket: socket: %s", strerror(errno));
|
||||
else
|
||||
zlog_warn("sbfdv6-socket: V6 is not supported, continuing");
|
||||
|
||||
return -1;
|
||||
}
|
||||
|
||||
bp_set_prio(s, SOCK_OPT_PRIO_HIGH);
|
||||
|
||||
return s;
|
||||
}
|
||||
|
||||
#ifdef BFD_LINUX
|
||||
static void bp_sbfd_encap_srh_ip6h_red(struct ip6_hdr *srh_ip6h, struct in6_addr *sip,
|
||||
struct in6_addr *dip, uint8_t seg_num, size_t datalen,
|
||||
uint16_t family)
|
||||
{
|
||||
/* SRH IPv6 Header */
|
||||
srh_ip6h->ip6_flow = (BFD_TOS_VAL << 20);
|
||||
srh_ip6h->ip6_vfc = 6 << 4;
|
||||
|
||||
if (seg_num == 1) {
|
||||
if (family == AF_INET6) {
|
||||
srh_ip6h->ip6_plen =
|
||||
htons(sizeof(struct ip6_hdr) + sizeof(struct udphdr) + datalen);
|
||||
srh_ip6h->ip6_nxt = IPPROTO_IPV6;
|
||||
} else {
|
||||
srh_ip6h->ip6_plen =
|
||||
htons(sizeof(struct ip) + sizeof(struct udphdr) + datalen);
|
||||
srh_ip6h->ip6_nxt = IPPROTO_IPIP;
|
||||
}
|
||||
|
||||
} else {
|
||||
srh_ip6h->ip6_plen = htons(sizeof(struct ip6_hdr) + sizeof(struct udphdr) +
|
||||
sizeof(struct ipv6_sr_hdr) +
|
||||
sizeof(struct in6_addr) * (seg_num - 1) + datalen);
|
||||
srh_ip6h->ip6_nxt = IPPROTO_ROUTING;
|
||||
}
|
||||
srh_ip6h->ip6_hlim = BFD_TTL_VAL;
|
||||
|
||||
memcpy(&(srh_ip6h->ip6_src), sip, sizeof(struct in6_addr));
|
||||
memcpy(&(srh_ip6h->ip6_dst), dip, sizeof(struct in6_addr));
|
||||
}
|
||||
|
||||
static void bp_sbfd_encap_srh_rth_red(struct ipv6_sr_hdr *srv6h, struct in6_addr *segment_list,
|
||||
uint8_t seg_num)
|
||||
{
|
||||
//caller should make sure: seg_num > 1
|
||||
srv6h->nexthdr = IPPROTO_IPV6;
|
||||
srv6h->hdrlen =
|
||||
GET_RTH_HDR_LEN(RTH_BASE_HEADER_LEN + sizeof(struct in6_addr) * (seg_num - 1));
|
||||
srv6h->type = IPV6_SRCRT_TYPE_4;
|
||||
srv6h->segments_left = seg_num - 1; //if encap reduce mode , seg_num-1
|
||||
srv6h->first_segment = seg_num - 2; //if encap reduce mode , seg_num-2
|
||||
srv6h->flags = 0;
|
||||
srv6h->tag = 0;
|
||||
|
||||
for (int i = 0; i < seg_num - 1; i++)
|
||||
memcpy(&srv6h->segments[i], &segment_list[seg_num - 1 - i], sizeof(struct in6_addr));
|
||||
}
|
||||
|
||||
static void bp_sbfd_encap_inner_ip6h(struct ip6_hdr *ip6h, struct in6_addr *sip,
|
||||
struct in6_addr *dip, size_t datalen)
|
||||
{
|
||||
/* IPv6 Header */
|
||||
ip6h->ip6_flow = (BFD_TOS_VAL << 20);
|
||||
ip6h->ip6_vfc = 6 << 4;
|
||||
ip6h->ip6_plen = htons(sizeof(struct udphdr) + datalen);
|
||||
ip6h->ip6_nxt = IPPROTO_UDP;
|
||||
ip6h->ip6_hlim = BFD_TTL_VAL;
|
||||
|
||||
memcpy(&(ip6h->ip6_src), sip, sizeof(struct in6_addr));
|
||||
memcpy(&(ip6h->ip6_dst), dip, sizeof(struct in6_addr));
|
||||
}
|
||||
|
||||
static void bp_sbfd_encap_inner_iph(struct ip *iph, struct in6_addr *sip, struct in6_addr *dip,
|
||||
size_t datalen)
|
||||
{
|
||||
/* IPv4 Header */
|
||||
iph->ip_v = 4;
|
||||
iph->ip_hl = 5;
|
||||
iph->ip_tos = BFD_TOS_VAL;
|
||||
iph->ip_len = htons(sizeof(struct ip) + sizeof(struct udphdr) + datalen);
|
||||
iph->ip_id = (uint16_t)frr_weak_random();
|
||||
iph->ip_ttl = BFD_TTL_VAL;
|
||||
iph->ip_p = IPPROTO_UDP;
|
||||
iph->ip_sum = 0;
|
||||
memcpy(&iph->ip_src, sip, sizeof(iph->ip_src));
|
||||
memcpy(&iph->ip_dst, dip, sizeof(iph->ip_dst));
|
||||
}
|
||||
|
||||
static void bp_sbfd_encap_udp6(struct udphdr *udph, struct ip6_hdr *ip6h, uint16_t src_port,
|
||||
uint16_t dst_port, uint8_t *payload, int payloadlen)
|
||||
{
|
||||
udph->source = htons(src_port);
|
||||
udph->dest = htons(dst_port);
|
||||
udph->len = htons(sizeof(struct udphdr) + payloadlen);
|
||||
udph->check = udp6_checksum(*ip6h, *udph, payload, payloadlen);
|
||||
}
|
||||
|
||||
static void bp_sbfd_encap_udp4(struct udphdr *udph, struct ip *iph, uint16_t src_port,
|
||||
uint16_t dst_port, uint8_t *payload, int payloadlen)
|
||||
{
|
||||
udph->source = htons(src_port);
|
||||
udph->dest = htons(dst_port);
|
||||
udph->len = htons(sizeof(struct udphdr) + payloadlen);
|
||||
udph->check = udp4_checksum(*iph, *udph, payload, payloadlen);
|
||||
}
|
||||
|
||||
/**
|
||||
* @brief encap srv6 to send raw socker red mode, just support ecore 2.5 case
|
||||
*
|
||||
* @param sd sokcet
|
||||
* @param data actual data, e.g. bfd packet or bfd echo packet
|
||||
* @param datalen actual data length
|
||||
* @param sip source ip address of outer ipv6 header and inner ipv6 header
|
||||
* @param dip destination ip address of inner ipv6 header
|
||||
* @param src_port source port of udp
|
||||
* @param dst_port destination port of udp
|
||||
* @param seg_num segment number of srh header
|
||||
* @param segment_list segment list of srh header and the last one segment is destination ip address of outer ipv6 header
|
||||
* @param ifname out interface name
|
||||
* @param vrfname vrf name
|
||||
* @param nhp specified nexthop
|
||||
* @return int
|
||||
*/
|
||||
static int bp_raw_sbfd_red_send(int sd, uint8_t *data, size_t datalen, uint16_t family,
|
||||
struct in6_addr *out_sip, struct in6_addr *sip,
|
||||
struct in6_addr *dip, uint16_t src_port, uint16_t dst_port,
|
||||
uint8_t seg_num, struct in6_addr *segment_list)
|
||||
{
|
||||
static uint8_t sendbuf[BUF_SIZ];
|
||||
struct msghdr msg = { 0 };
|
||||
struct iovec iov;
|
||||
int flags = 0;
|
||||
int ret = 0;
|
||||
|
||||
struct ip6_hdr *srh_ip6h;
|
||||
struct ipv6_sr_hdr *psrv6h; // srh Routing header
|
||||
struct ip6_hdr *ip6h;
|
||||
struct ip *iph;
|
||||
struct udphdr *udp;
|
||||
uint8_t *payload;
|
||||
|
||||
struct ipaddr out_sip_addr = { 0 };
|
||||
struct sockaddr_in6 dst_sin6 = { 0 };
|
||||
char buf_addr[INET6_ADDRSTRLEN] = { 0 };
|
||||
|
||||
memset(sendbuf, 0, sizeof(sendbuf));
|
||||
int total_len = 0;
|
||||
|
||||
/* SRH IPv6 Header */
|
||||
if (seg_num > 0) {
|
||||
memcpy(&out_sip_addr.ipaddr_v6, out_sip, sizeof(struct in6_addr));
|
||||
|
||||
srh_ip6h = (struct ip6_hdr *)(sendbuf + total_len);
|
||||
bp_sbfd_encap_srh_ip6h_red(srh_ip6h, &out_sip_addr.ipaddr_v6, &segment_list[0],
|
||||
seg_num, datalen, family);
|
||||
total_len += sizeof(struct ip6_hdr);
|
||||
|
||||
memcpy(&dst_sin6.sin6_addr, &segment_list[0], sizeof(struct in6_addr));
|
||||
}
|
||||
|
||||
//case with srh header
|
||||
if (seg_num > 1) {
|
||||
psrv6h = (struct ipv6_sr_hdr *)(sendbuf + total_len);
|
||||
bp_sbfd_encap_srh_rth_red(psrv6h, segment_list, seg_num);
|
||||
total_len += sizeof(struct ipv6_sr_hdr) + sizeof(struct in6_addr) * (seg_num - 1);
|
||||
}
|
||||
|
||||
if (family == AF_INET6) {
|
||||
if (seg_num == 0)
|
||||
memcpy(&dst_sin6.sin6_addr, dip, sizeof(struct in6_addr));
|
||||
|
||||
/* Inner IPv6 Header */
|
||||
ip6h = (struct ip6_hdr *)(sendbuf + total_len);
|
||||
bp_sbfd_encap_inner_ip6h(ip6h, sip, dip, datalen);
|
||||
total_len += sizeof(struct ip6_hdr);
|
||||
|
||||
/* UDP Header */
|
||||
udp = (struct udphdr *)(sendbuf + total_len);
|
||||
bp_sbfd_encap_udp6(udp, ip6h, src_port, dst_port, data, datalen);
|
||||
total_len += sizeof(struct udphdr);
|
||||
} else {
|
||||
if (seg_num == 0) {
|
||||
//should never come to here, just print a error hint
|
||||
zlog_err("%s error, empty sidlist for ipv4 bfd", __func__);
|
||||
}
|
||||
|
||||
/* Inner IPv4 Header */
|
||||
iph = (struct ip *)(sendbuf + total_len);
|
||||
bp_sbfd_encap_inner_iph(iph, sip, dip, datalen);
|
||||
total_len += sizeof(struct ip);
|
||||
|
||||
/* UDP Header */
|
||||
udp = (struct udphdr *)(sendbuf + total_len);
|
||||
bp_sbfd_encap_udp4(udp, iph, src_port, dst_port, data, datalen);
|
||||
total_len += sizeof(struct udphdr);
|
||||
|
||||
iph->ip_sum = in_cksum((const void *)iph, sizeof(struct ip));
|
||||
}
|
||||
|
||||
/* BFD payload*/
|
||||
payload = (uint8_t *)(sendbuf + total_len);
|
||||
memcpy(payload, data, datalen);
|
||||
total_len += datalen;
|
||||
|
||||
dst_sin6.sin6_family = AF_INET6;
|
||||
dst_sin6.sin6_port = 0; //we don't use sin6_port in raw, but should set to 0!!
|
||||
|
||||
/* message data. */
|
||||
iov.iov_base = (uint8_t *)sendbuf;
|
||||
iov.iov_len = total_len;
|
||||
|
||||
msg.msg_name = &dst_sin6;
|
||||
msg.msg_namelen = sizeof(struct sockaddr_in6);
|
||||
msg.msg_iov = &iov;
|
||||
msg.msg_iovlen = 1;
|
||||
|
||||
/* sendmsg */
|
||||
ret = sendmsg(sd, &msg, flags);
|
||||
if (ret < 0) {
|
||||
inet_ntop(AF_INET6, &dst_sin6.sin6_addr, buf_addr, INET6_ADDRSTRLEN);
|
||||
zlog_debug("sbfd send to:%s failed , ret:%d, errno:%s", buf_addr, ret,
|
||||
safe_strerror(errno));
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue