diff options
Diffstat (limited to 'usr.sbin/bgpd/mrt.c')
| -rw-r--r-- | usr.sbin/bgpd/mrt.c | 92 |
1 files changed, 84 insertions, 8 deletions
diff --git a/usr.sbin/bgpd/mrt.c b/usr.sbin/bgpd/mrt.c index a2a029e0276..4e68ae09e12 100644 --- a/usr.sbin/bgpd/mrt.c +++ b/usr.sbin/bgpd/mrt.c @@ -1,4 +1,4 @@ -/* $OpenBSD: mrt.c,v 1.19 2004/01/07 12:34:23 claudio Exp $ */ +/* $OpenBSD: mrt.c,v 1.20 2004/01/10 16:20:29 claudio Exp $ */ /* * Copyright (c) 2003, 2004 Claudio Jeker <claudio@openbsd.org> @@ -38,10 +38,13 @@ * XXX imsg_create(), imsg_add(), imsg_close() ... */ -static int mrt_dump_entry(struct mrt_config *, struct prefix *, u_int16_t, - struct peer_config *); -static int mrt_dump_header(struct buf *, u_int16_t, u_int16_t, u_int32_t); -static int mrt_open(struct mrt *); +static u_int16_t mrt_attr_length(struct attr_flags *); +static int mrt_attr_dump(void *, u_int16_t, struct attr_flags *); +static int mrt_dump_entry(struct mrt_config *, struct prefix *, + u_int16_t, struct peer_config *); +static int mrt_dump_header(struct buf *, u_int16_t, u_int16_t, + u_int32_t); +static int mrt_open(struct mrt *); #define DUMP_BYTE(x, b) \ do { \ @@ -196,6 +199,79 @@ mrt_dump_state(struct mrt_config *mrt, u_int16_t old_state, u_int16_t new_state, } +static u_int16_t +mrt_attr_length(struct attr_flags *a) +{ + struct attr *oa; + u_int16_t alen, plen; + + alen = 4 /* origin */ + 7 /* nexthop */ + 7 /* lpref */; + plen = aspath_length(a->aspath); + alen += 2 + plen + (plen > 255 ? 2 : 1); + if (a->med != 0) + alen += 7; + + TAILQ_FOREACH(oa, &a->others, attr_l) + alen += 2 + oa->len + (oa->len > 255 ? 2 : 1); + + return alen; +} + +static int +mrt_attr_dump(void *p, u_int16_t len, struct attr_flags *a) +{ + struct attr *oa; + u_char *buf = p; + u_int32_t tmp32; + int r; + u_int16_t aslen, wlen = 0; + + /* origin */ + if ((r = attr_write(buf + wlen, len, ATTR_WELL_KNOWN, ATTR_ORIGIN, + &a->origin, 1)) == -1) + return (-1); + wlen += r; len -= r; + + /* aspath */ + aslen = aspath_length(a->aspath); + if ((r = attr_write(buf + wlen, len, ATTR_WELL_KNOWN, ATTR_ASPATH, + aspath_dump(a->aspath), aslen)) == -1) + return (-1); + wlen += r; len -= r; + + /* nexthop, already network byte order */ + if ((r = attr_write(buf + wlen, len, ATTR_WELL_KNOWN, ATTR_NEXTHOP, + &a->nexthop, 4)) == -1) + return (-1); + wlen += r; len -= r; + + /* MED, non transitive */ + if (a->med != 0) { + tmp32 = htonl(a->med); + if ((r = attr_write(buf + wlen, len, ATTR_OPTIONAL, ATTR_MED, + &tmp32, 4)) == -1) + return (-1); + wlen += r; len -= r; + } + + /* local preference, only valid for ibgp */ + tmp32 = htonl(a->lpref); + if ((r = attr_write(buf + wlen, len, ATTR_WELL_KNOWN, ATTR_LOCALPREF, + &tmp32, 4)) == -1) + return (-1); + wlen += r; len -= r; + + /* dump all other path attributes without modification */ + TAILQ_FOREACH(oa, &a->others, attr_l) { + if ((r = attr_write(buf + wlen, len, oa->flags, oa->type, + oa->data, oa->len)) == -1) + return (-1); + wlen += r; len -= r; + } + + return (wlen); +} + static int mrt_dump_entry(struct mrt_config *mrt, struct prefix *p, u_int16_t snum, struct peer_config *peer) @@ -206,7 +282,7 @@ mrt_dump_entry(struct mrt_config *mrt, struct prefix *p, u_int16_t snum, u_int16_t len, attr_len; int n; - attr_len = attr_length(&p->aspath->flags); + attr_len = mrt_attr_length(&p->aspath->flags); len = MRT_DUMP_HEADER_SIZE + attr_len; hdr.len = len + IMSG_HEADER_SIZE + MRT_HEADER_SIZE; @@ -244,8 +320,8 @@ mrt_dump_entry(struct mrt_config *mrt, struct prefix *p, u_int16_t snum, return (-1); } - if (attr_dump(bptr, attr_len, &p->aspath->flags) == -1) { - logit(LOG_ERR, "mrt_dump_entry: attr_dump error"); + if (mrt_attr_dump(bptr, attr_len, &p->aspath->flags) == -1) { + logit(LOG_ERR, "mrt_dump_entry: mrt_attr_dump error"); buf_free(buf); return (-1); } |