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Code Issues Releases Wiki Activity

packets: New function eth_from_hex().

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Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2011-12-06 14:09:10 -08:00
parent 0e15264f96
commit e22f17535e
3 changed files with 31 additions and 8 deletions
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25
lib/packets.c
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@@ -121,6 +121,31 @@ eth_pop_vlan(struct ofpbuf *packet)
}
}
/* Converts hex digits in 'hex' to an Ethernet packet in '*packetp'. The
* caller must free '*packetp'. On success, returns NULL. On failure, returns
* an error message and stores NULL in '*packetp'. */
const char *
eth_from_hex(const char *hex, struct ofpbuf **packetp)
{
struct ofpbuf *packet;
packet = *packetp = ofpbuf_new(strlen(hex) / 2);
if (ofpbuf_put_hex(packet, hex, NULL)[0] != '\0') {
ofpbuf_delete(packet);
*packetp = NULL;
return "Trailing garbage in packet data";
}
if (packet->size < ETH_HEADER_LEN) {
ofpbuf_delete(packet);
*packetp = NULL;
return "Packet data too short for Ethernet";
}
return NULL;
}
/* Given the IP netmask 'netmask', returns the number of bits of the IP address
* that it specifies, that is, the number of 1-bits in 'netmask'. 'netmask'
* must be a CIDR netmask (see ip_is_cidr()). */